U.S. patent application number 10/033398 was filed with the patent office on 2002-05-09 for arrowhead tip with a cutting edge.
Invention is credited to Liechty, Victor Jay II.
Application Number | 20020055404 10/033398 |
Document ID | / |
Family ID | 22172422 |
Filed Date | 2002-05-09 |
United States Patent
Application |
20020055404 |
Kind Code |
A1 |
Liechty, Victor Jay II |
May 9, 2002 |
Arrowhead tip with a cutting edge
Abstract
Faceted cutting tips or forward leading ends of arrowheads
having a sharp cutting edge at the juncture of adjoining facets. A
bevel or bevels substantially follow(s) the contour of each cutting
edge and is disposed adjacent each respective cutting edge. The
facets may have at least portions thereof concave, convex or flat,
as well as may the corresponding bevel(s). The structural facet
integrity of the cutting tip is retained so as to sufficiently
crush/split heavy bone and push penetrated material easily from its
cutting path, while concomitantly slicing soft tissue with the ease
of a razor edge.
Inventors: |
Liechty, Victor Jay II;
(Provo, UT) |
Correspondence
Address: |
Jay Liechty Jr.
1250 N. 1750 W.
Provo
UT
84604
US
|
Family ID: |
22172422 |
Appl. No.: |
10/033398 |
Filed: |
October 22, 2001 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
10033398 |
Oct 22, 2001 |
|
|
|
09082636 |
May 21, 1998 |
|
|
|
Current U.S.
Class: |
473/583 |
Current CPC
Class: |
F42B 6/08 20130101 |
Class at
Publication: |
473/583 |
International
Class: |
F42B 006/08; A63B
065/02 |
Claims
I claim:
1. An arrowhead comprising: a body extending from a forward end to
an opposing rearward end; a first cuffing edge and a second cutting
edge disposed at the forward end of the body; and a first facet
extending between the first cutting edge and the second cutting
edge, the first facet comprising: a primary facet portion at least
partially disposed between the first cutting edge and the second
cutting edge; and a first bevel extending from the first cutting
edge to the primary facet portion along at least a portion of the
length of the first cutting edge, the first bevel and primary facet
portion intersecting at a bevel boundary forming a corner, at least
a portion of the first bevel being concave.
2. An arrowhead as recited in claim 1, wherein the bevel boundary
forms an inside corner.
3. An arrowhead as recited in claim 1, wherein the bevel boundary
forms an outside corner.
4. An arrowhead as recited in claim 1, wherein the bevel boundary
forms a rounded corner.
5. An arrowhead as recited in claim 1, wherein at least a portion
of the primary facet portion is concave.
6. An arrowhead as recited in claim 1, wherein at least a portion
of the primary facet portion is convex.
7. An arrowhead as recited in claim 1, wherein at least a portion
of the primary facet portion is substantially flat.
8. An arrowhead as recited in claim 1, wherein the first facet
further comprises a second bevel extending from the second cutting
edge to the primary facet portion along at least a portion of the
length of the second cutting edge.
9. An arrowhead as recited in claim 1, wherein the first bevel
substantially extends along the full length of the first cutting
edge.
10. An arrowhead as recited in claim 1, wherein the first cutting
edge and the second cutting edge intersect at a forward apex point
of the body.
11. An arrowhead as recited in claim 1, wherein the bevel boundary
substantially follows or parallels the contour of the first cutting
edge for at least a portion of the length of the first cutting
edge.
12. An arrowhead as recited in claim 1, wherein the bevel boundary
does not substantially follow or parallel the contour of the first
cutting edge for at least a portion of the length of the first
cutting edge.
13. An arrowhead as recited in claim 1, further comprising: a third
cutting edge disposed at the forward end of the body; and a second
facet extending between the second cutting edge and the third
cutting edge.
14. An arrowhead as recited in claim 1, wherein the body comprises
a tip piece attached at the forward end thereof, the tip piece
having the first and second cutting edges, facet and bevel disposed
thereon.
15. An arrowhead as recited in claim 1, wherein the primary facet
portion of the first facet is formed at least in part by a first
manufacturing operation, and the first bevel is formed at least in
part by a second different manufacturing operation.
16. An arrowhead as recited in claim 15, wherein at least a section
of the primary facet portion of the first facet and at least a
section of the first bevel are formed by material removing tools,
the material removing tool forming at least a section of the
primary facet portion of the first facet being a different tool
than the material removing tool forming at least a section of first
bevel.
17. An arrowhead as recited in claim 16, wherein the material
removing tools forming at least sections of the primary facet
portion of the first facet and the first bevel each have rotation
about an axis.
18. An arrowhead comprising: a body extending from a forward end to
an opposing rearward end; a first cutting edge and a second cutting
edge disposed at the forward end of the body; a first facet
extending between the first cutting edge and the second cutting
edge, the first facet comprising: a first primary facet portion at
least partially disposed between the first cutting edge and the
second cutting edge, at least a portion of the first primary facet
portion being convex or substantially flat; and a first bevel
extending from the first cutting edge to the first primary facet
portion along at least a portion of the length of the first cutting
edge, at least a portion of the first bevel being concave or
substantially flat.
19. An arrowhead as recited in claim 18, wherein the first bevel
and the first primary facet portion intersect at a bevel boundary
forming a corner.
20. An arrowhead as recited in claim 19, wherein the bevel boundary
forms an inside corner or an outside corner.
21. An arrowhead as recited in claim 19, wherein the bevel boundary
forms a rounded corner.
22. An arrowhead as recited in claim 18, wherein the first primary
facet portion has a substantially V-shaped configuration.
23. An arrowhead as recited in claim 18, further comprising: a
third cutting edge disposed at the forward end of the body; and a
second facet extending between the second cutting edge and the
third cutting edge.
24. An arrowhead as recited in claim 23, further comprising a third
facet extending between the first cutting edge and the third
cutting edge, the third facet including: a second primary facet
portion at least partially disposed between the first cutting edge
and the third cutting edge; and a second bevel extending from the
first cutting edge to the second primary facet portion along at
least a portion of the length of the first cutting edge.
25. An arrowhead as recited in claim 18, wherein the first cutting
edge and the second cutting edge intersect at a forward apex point
of the body.
26. An arrowhead as recited in claim 18, wherein the bevel boundary
substantially follows or parallels the contour of the first cutting
edge for at least a portion of the length of the first cutting
edge.
27. An arrowhead as recited in claim 18, wherein the bevel boundary
does not substantially follow or parallel the contour of the first
cutting edge for at least a portion of the length of the first
cutting edge.
28. An arrowhead as recited in claim 18, wherein the primary facet
portion of the first facet is formed at least in part by a first
manufacturing operation, and the first bevel is formed at least in
part by a second different manufacturing operation.
29. An arrowhead as recited in claim 18, wherein the first cutting
edge is substantially linear.
30. An arrowhead comprising: a body having a central longitudinal
axis extending from a forward end to an opposing rearward end; a
first cutting edge disposed at the forward end of the body; a first
facet extending from the first cutting edge on a first side of the
first cutting edge; and a second facet extending from the first
cutting edge on a second side of the first cutting edge, the first
facet comprising: a first primary facet portion at least partially
disposed between the first cutting edge and the second cutting
edge; and a first bevel extending from the first cutting edge to
the first primary fact portion along at least a portion of the
length of the first cutting edge, the first bevel and first primary
facet portion intersecting at a bevel boundary, the first bevel
being configured such that when viewed in a plane extending through
the first bevel perpendicular to the central longitudinal axis of
the body, the plane intersecting the first cutting edge at an apex,
the following angles are formed: a first inside angle extending
from the apex to points intersecting the first bevel and the second
facet at a first radius from the apex; and a second inside angle
extending from the apex to points intersecting the first primary
facet portion and second facet at a second radius from the apex,
the first inside angle being smaller than the second inside
angle.
31. An arrowhead as recited in claim 30, wherein the bevel boundary
forms a corner.
32. An arrowhead as recited in claim 31, wherein the corner is an
inside corner or an outside corner.
33. An arrowhead as recited in claim 31, wherein the corner is
rounded.
34. An arrowhead as recited in claim 30, wherein at least a portion
of the first primary facet portion is concave.
35. An arrowhead as recited in claim 30, wherein at least a portion
of the first primary facet portion is convex.
36. An arrowhead as recited in claim 30, wherein at least a portion
of the first primary facet portion is substantially flat.
37. An arrowhead as recited in claim 30, wherein at least a portion
of the first bevel is concave or substantially flat.
38. An arrowhead as recited in claim 30, further comprising a
second cutting edge and a third cutting edge disposed at the
forward end of the body, the second facet extending between the
first cutting edge and the third cutting edge.
39. An arrowhead as recited in claim 38, wherein the second facet
includes: a second primary facet portion at least partially
disposed between the first cutting edge and the third cutting edge;
and a second bevel extending from the first cutting edge to the
second primary facet portion along at least a portion of the length
of the first cutting edge.
40. An arrowhead as recited in claim 38, further comprising a third
facet extending between the second cutting edge and the third
cutting edge, the third facet including: a third primary facet
portion at least partially disposed between the second cutting edge
and the third cutting edge; and a third bevel extending from the
second cutting edge to the third primary facet portion along at
least a portion of the length of the second cutting edge.
41. An arrowhead as recited in claim 30, wherein the first, second
and third cutting edges intersect at a forward apex point of the
body.
42. An arrowhead as recited in claim 30, wherein the body comprises
a tip piece attached at the forward end thereof, the tip piece
having the cutting edges, facets and bevels disposed thereon.
43. An arrowhead comprising: a body extending from a forward end to
an opposing rearward end; a first cutting edge and a second cutting
edge disposed at the forward end of the body, the first cutting
edge having a forward most terminus and a rearward most terminus,
and the second cutting edge having a forward most terminus and a
rearward most terminus; and a facet extending between the first
cutting edge and the second cutting edge, the facet comprising: a
primary facet portion at least partially disposed between the first
cutting edge and the second cutting edge; and a first bevel
extending from the first cutting edge to the primary facet portion
along at least a portion of the length of the first cutting edge,
the first bevel having an exterior surface, the facet being
configured such that the entire exterior surface of the first bevel
does not lie in a plane intersecting the forward most and the
rearward most terminuses of both the first and second cutting
edges.
44. An arrowhead as recited in claim 43, further comprising a
plurality of said facets.
45. An arrowhead as recited in claim 43, further comprising a
second bevel extending from the second cutting edge to the primary
facet portion along at least a portion of the length of the second
cutting edge, the second bevel having an exterior surface, the
facet being configured such that the entire exterior surface of the
bevel does not lie in a plane intersecting the forward most and
rearward most terminuses of both the first and second cutting
edges.
46. An arrowhead as recited in claim 45, further comprising a
plurality of said facets.
47. An arrowhead as recited in claim 43, wherein the first and
second cutting edges are linear.
48. An arrowhead as recited in claim 43, further comprising: a
central longitudinal axis; and a second facet extending from the
first cutting edge on a side of the first cutting edge opposite the
first facet, the first bevel being configured such that when viewed
in a plane extending through the first bevel perpendicular to the
central longitudinal axis of the body, the plane intersecting the
first cutting edge at an apex, the following angles are formed: a
first inside angle extending from the apex to points intersecting
the first bevel and the second facet at a first radius from the
apex; and a second inside angle extending from the apex to points
intersecting the first primary facet portion and second facet at a
second radius from the apex, the first inside angle being smaller
than the second inside angle.
49. An arrowhead as recited in claim 43, wherein the primary facet
portion of the first facet is formed at least in part by a first
manufacturing operation, and the first bevel is formed at least in
part by a second different manufacturing operation.
50. An arrowhead as recited in claim 49, wherein at least a section
of the primary facet portion of the first facet and at least a
section of the first bevel are formed by material removing tools,
the material removing tool forming at least a section of the
primary facet portion of the first facet being a different tool
than the material removing tool forming at least a section of first
bevel.
51. An arrowhead as recited in claim 50, wherein the material
removing tools forming at least sections of the primary facet
portion of the first facet and the first bevel each have rotation
about at axis.
52. An arrowhead comprising: a body extending from a forward end to
an opposing rearward end; a first cutting edge and a second cutting
edge disposed at the forward end of the body, the first cutting
edge having a forward most terminus and a rearward most terminus,
and the second cutting edge having a forward most terminus and a
rearward most terminus; and a facet extending between the first
cutting edge and the second cutting edge, the facet comprising: a
primary facet portion at least partially disposed between the first
cutting edge and the second cutting edge; and a first bevel
extending from the first cutting edge to the primary facet portion
along at least a portion of the length of the first cutting edge,
the first bevel having an exterior surface, the facet being
configured such that at least a portion of the exterior surface of
the first bevel displaced a distance away from the first cutting
edge, does not lie in a plane intersecting the forward most and the
rearward most terminuses of both the first and second cutting
edges.
53. An arrowhead as recited in claim 52, further comprising a
plurality of said facets.
54. An arrowhead as recited in claim 52, further comprising a
second bevel extending from the second cutting edge to the primary
facet portion along at least a portion of the length of the second
cutting edge, the second bevel having an exterior surface, the
facet being configured such that the entire exterior surface of the
bevel does not lie in a plane intersecting the forward most and
rearward most terminuses of both the first and second cutting
edges.
55. An arrowhead as recited in claim 54, further comprising a
plurality of said facets.
56. An arrowhead as recited in claim 52, wherein the first and
second cutting edges are linear.
57. An arrowhead as recited in claim 52, wherein the primary facet
portion of the first facet is formed at least in part by a first
manufacturing operation, and the first bevel is formed at least in
part by a second different manufacturing operation.
58. An arrowhead as recited in claim 57, wherein at least a section
of the primary facet portion of the first facet and at least a
section of the first bevel are formed by material removing tools,
the material removing tool forming at least a section of the
primary facet portion of the first facet being a different tool
than the material removing tool forming at least a section of first
bevel.
59. An arrowhead as recited in claim 58, wherein the material
removing tools forming at least sections of the primary facet
portion of the first facet and the first bevel each have rotation
about an axis.
60. An arrowhead as recited in claim 52, further comprising: a
central longitudinal axis; and a second facet extending from the
first cutting edge on a side of the first cutting edge opposite the
first facet, the first bevel being configured such that when viewed
in a plane extending through the first bevel perpendicular to the
central longitudinal axis of the body, the plane intersecting the
first cutting edge at an apex, the following angles are formed: a
first inside angle extending from the apex to points intersecting
the first bevel and the second facet at a first radius from the
apex; and a second inside angle extending from the apex to points
intersecting the first primary facet portion and second facet at a
second radius from the apex, the first inside angle being smaller
than the second inside angle.
Description
[0001] This application is a divisional application of my U.S.
patent application Ser. No. 09/082 636 filed May 21, 1998 now U.S.
Pat. No. 6,306,053 incorporated herein by specific reference, and
to which priority is claimed under 35 U.S.C. Section 102.
BACKGROUND
[0002] 1. Field of the Invention
[0003] This invention relates generally to the forward leading end
of arrowheads such as those having faceted cutting tips thereon or
cutting tip sections thereof, where the arrowheads have at least
one increased sharpness beveled cutting edge.
[0004] 2. Description of Prior Art
[0005] Devices having a leading penetrating end used to penetrate a
substance are used in many types of applications, including use in
archery equipment and surgical instruments. A popular type of
penetrating end point or tip that is used both in archery and
surgery is the trocar tip. The word trocar has Latin roots of tres
meaning three and carre meaning side of a sword or knife. A trocar
tip is therefore three sided and is the pointed leading end of an
object used to cut or pierce. The three sides of trocar tips are
generally hollow ground. The term hollow ground refers to the
grinding process used to fabricate the sides of the tip and
generally means that the sides are dished-out or substantially
concave, as compared to being flat. The hollow ground feature gives
the tip better defined cutting edges at the juncture of the sides
with each other than the cutting edges at side junctures of tips
having flat sides. The hollow ground feature also gives the tip the
ability to easily push the substance being penetrated away from the
tip. The earliest known use of trocar tips date back to the
medieval times where they were used on the leading ends of knights'
lances.
[0006] In surgery a surgical trocar is one type of a surgical
instrument that has a leading penetrating end. Surgical trocars are
generally used to pierce body cavities during the surgical
procedures of dropsy, endoscopy and laparoscopy etc. The
penetrating ends of surgical trocars generally have a type of
trocar tip, since from such tip they were named. There are various
types of surgical trocars, with a variety of different options and
accessories available depending on the procedure(s) to be
performed. However, the leading end point of the surgical trocar
should be as sharp as possible, should push penetrated or cut
tissue away from its cutting path, and also should be as cost
effective to produce as possible.
[0007] In archery a bow is used to shoot an arrow towards a target.
A conventional arrow has a shaft, a nock at one end that receives
the bow string, and an arrowhead or point that attaches to the
opposite end of the arrow shaft which aids in penetrating the
target. Arrowheads generally have a pointed forward end, and an
opposite threaded shaft end that attaches the arrowhead to the
arrow shaft. Arrowheads come in a variety of different sizes and
configurations depending on their intended use. For example, there
are specifically designed arrowheads for competitive target
shooting, shooting fish, hunting birds or small game animals, and
for hunting big game animals.
[0008] Arrowheads used for bowhunting are generally know as
broadheads. Broadheads have cutting blades and kill game animals by
cutting vital organs such as the lungs and vascular vessels such as
arteries, which causes rapid hemorrhaging and/or suffocation. Quick
and humane kills are dependent on accurate shot placement, and upon
the amount or volume of the animal tissue that is cut. Hunting
arrowheads that cut more tissue are more lethal, and therefore are
better. The volume of tissue that is cut is determined by the
cutting diameter of the arrowhead, the number of blades it
contains, and by the distance the arrowhead penetrates into the
animal. The two most common types of arrowheads used for hunting
are fixed-blade arrowheads and blade-opening arrowheads or
mechanical arrowheads. Blade-opening arrowheads differ from
conventional fixed-blade arrowheads in that the cutting blades are
folded up or held adjacent to the arrowhead body in a retracted
position while the arrow is in flight, but at impact with the game
animal rotate or pivot into an open position, whereas the blades of
fixed-blade arrowheads are permanently held at a full cutting
diameter position at all times.
[0009] Both blade-opening and fixed-blade arrowheads have a pointed
tip end used for penetrating the game animal. The tip of the
arrowhead may be separably attachable to the arrowhead body or may
be integral with it. Conventional arrowheads have historically had
two basic types of pointed arrowhead tips: bone-crushing chisel
type tips such as the hollow ground trocar tip, and razor blade
type tips. The razor blade tips are generally just an extension of
the cutting blades of the arrowhead and terminate in a leading
pointed apex. Both types of arrowhead tips are designed to maximize
penetration and therefore provide a more lethal arrowhead by
cutting a larger volume of animal tissue. Despite their designs and
intent both the bone crushing chisel tips and the razor blade tips
fall short of providing optimum penetrating performance. Since the
arrowhead razor blade type tips generally have a true cutting edge,
or a cutting edge that has a small enough angle between opposing
sides so as to make it as sharp as a razor or scalpel blade, they
penetrate the best through soft tissues such as skin, muscles,
lungs and other internal organs by slicing or cutting. But when a
razor blade tip impacts bone the thin cutting blade generally gets
sheared or broken-off due to the heavy impact forces delivered to
it, and thus leaves a blunt snagging leading end that greatly
inhibits penetration and therefore is less lethal in many
instances--since arrowheads very commonly impact bone when
penetrating game animals. The bone-crushing chisel tips on the
other hand split right through heavy bone but lack a truly sharp
cutting edge and therefore do not perform as well in penetrating
the skin and other soft tissues.
[0010] Attempts in the prior art have been made to combine a
scalpel sharp cutting edge with bone splitting capabilities into an
optimally penetrating arrowhead tip, but these attempts have their
own problems as well. For example the introduction of chisel tips
with hollow ground sides, such as the three sided trocar tip for
arrowhead points helped reduce the angle of the cutting edge
between the sides of the tip. But the edges of conventional trocar
arrowhead tips and other hollow ground arrowhead tips are still
relatively dull and are a far cry from having the fine cutting
angle or edge a scalpel or razor blade possesses. Other attempts in
the prior art to increase the sharpness of the edges of chisel type
arrowhead tips have been made by increasing the curvature of the
hollow ground sides. This practice greatly weakens the tip giving
it problems similar to those of the razor blade type tips and also
provides a tip that does not push the tissue away from the
arrowhead optimally.
[0011] It is apparent that there are needed improvements in cutting
tips.
[0012] It is apparent that there is a need for an arrowhead cutting
tip that combines the optimal penetration features of the most
rugged bone splitting trocar or chisel type arrowhead tips with the
razor sharp cutting features of the razor blade type arrowhead tips
into one arrowhead tip.
[0013] It is also apparent that there is a need for a cutting tip
of a surgical trocar that is cost effective to produce, extremely
sharp, and that pushes the penetrated or cut tissue away from its
cutting path.
SUMMARY OF THE INVENTION
[0014] It is one object of the present invention to provide cutting
tips and penetrating tips that cut and/or penetrate more
efficiently than prior art cutting tips.
[0015] It is another object of the present invention to provide a
cutting tip that has a smaller angle as referenced between cutting
tip structure such as adjoining sides or facets that are located a
distance closer to their respective cutting edge than an angle as
referenced between cutting tip structure such as adjoining sides or
facets located a distance further from the respective cutting edge
than the first or closer distance, as measured in the same
perpendicular plane to the central longitudinal axis of the
respective cutting tip.
[0016] It is another object of the present invention to provide a
cutting tip that has a side or facet with a cutting edge from which
for at least a portion of the time that the cutting edge of the
facet is being formed, facet material is removed from only the
bisected side of the facet that the cutting edge being formed is
on.
[0017] It is another object of the present invention to provide a
cutting tip that has a side or facet that is formed at least in
part from a rotational grinding wheel whose axis of rotation is
inclined with respect to the central longitudinal axis of the
cutting tip when forming at least a portion of the facet.
[0018] It is another object of the present invention to provide a
cutting tip that has a side or facet with a facet bisecting plane,
wherein the facet is formed at least in part from a rotational
grinding wheel whose axis of rotation is inclined with respect to
the bisecting plane of the facet when forming at least a portion of
the facet.
[0019] It is another object of the present invention to provide a
cutting tip having a central longitudinal axis that is collinear
with the Y-axis of a Cartesian X-Y-Z axis system, and a side or
facet that is formed from a plurality of rotational machining
tools--such as grinding wheels--each having an axis of rotation
where the axis of rotation of at least one rotational machining
tool of the plurality of rotational machining tools is oriented,
with respect to at least one of the X-Y-Z axises and therefore at
least one of the corresponding three dimensional planes X-Y, X-Z
and Y-Z when forming its particular portion of the facet or cutting
tip, in a different manner or spatial orientation than the spatial
orientation the axis of rotation of at least one other rotational
machining tool of the plurality of rotational machining tools when
the other rotational machining tool is forming its particular
portion of the facet or cutting tip.
[0020] It is another object of the present invention to provide a
cutting tip that has a side or facet that is formed from a
plurality of rotational machining tools each having a radius of
rotation where at least one rotational machining tool of the
plurality of rotational machining tools has a radius of rotation
that has a different length of radius than the radius of rotation
of at least one other rotational machining tool.
[0021] It is another object of the present invention to provide a
cutting tip that has a side or facet that is formed from a
plurality of rotational machining tools each having an axial
thickness where at least one rotational machining tool of the
plurality of rotational machining tools has a different axial
thickness than the axial thickness of at least one other rotational
machining tool.
[0022] It is another object of the present invention to provide a
cutting tip that has a side or facet that is formed from a
plurality of rotational machining tools each having an exterior
circumferential profile where at least one rotational machining
tool of the plurality of rotational machining tools has a different
exterior circumferential profile than the exterior circumferential
profile of at least one other rotational machining tool.
[0023] It is also another object of the present invention to
provide a cutting tip whose barrel portion has a razor sharp
cutting edge.
[0024] It is also another object of the present invention to
provide a cutting tip which has tip blades.
[0025] It is also another object of the present invention to
provide a blade-opening arrowhead having blades that pivot in a
rearward direction away from the tip of the arrowhead, which has a
razor sharp cutting tip to enhance penetration.
[0026] It is still another object of the present invention to
provide a faceted cutting tip of a surgical trocar that is cost
effective to produce, extremely sharp, and that pushes the
penetrated or cut tissue away from its cutting path.
[0027] It is yet further another object of the present invention to
provide an arrowhead cutting tip that combines the optimal
penetration features of the most rugged bone splitting trocar or
chisel type arrowhead tips with the razor sharp cutting features of
the razor blade type arrowhead tips into one arrowhead tip.
[0028] The foregoing objects and advantages and other objects and
advantages of the present invention are accomplished as according
to one preferred embodiment of this invention with a three faceted
hollow ground stainless steel cutting tip that has a bevel ground
on each facet adjacent to and communicating with each cutting edge
which is located at each facet juncture with an adjacent facet,
such that the angle between the bevel of one facet and the facet on
the side of the cutting edge opposite the facet with the bevel
thereon is less than an angle measured between points located a
distance from the cutting edge that is beyond the bevel or further
from the cutting edge than the bevel. Such a cutting tip is
preferably formed by first grinding the three hollow ground facets
with a specific grinding wheel, and then by grinding each of the
three bevels on the hollow ground facets with a different grinding
wheel. Such a cutting tip enables the formation of an extremely
sharp cutting edge at each facet juncture, such as that is
attainable on a scalpel blade or a razor blade, while retaining the
facet structure necessary to optimally push penetrated material
away from the cutting tip and to easily split and crush heavy bone.
Such a cuffing tip would in effect combine the optimal penetration
features of the most rugged bone splitting trocar or chisel type
arrowhead tips with the razor sharp cutting features of the razor
blade type arrowhead tips into one arrowhead tip, and thus create a
deep penetrating and ultimately tough and lethal trocarazor or
trocrazor arrowhead tip.
[0029] Another preferred embodiment according to this invention
differs from the above described embodiment in that there are two
bevels formed upon each facet so that each cutting edge has a bevel
on either side of it.
[0030] Other preferred embodiments according to this invention have
razor sharp cutting edges located on the barrel portion of each
cutting tip, or the portion of the cutting tip reward of the
facets. According to some such embodiments the cutting tips may
have both razor sharp edges located upon the barrel section of the
tips and also at the facet junctures.
[0031] Yet other preferred embodiments according to this invention
differ from the above described embodiments in that the razor sharp
edges are attained by attachment of separate razor blades or tip
blades to the cutting tips by inserting them into slots in the
cutting tip body. According to some such preferred embodiments the
tip blades are integrally attached to the tip body, such as by
welding. According to other such preferred embodiments the
attachable tip blades are removably attachable.
[0032] Yet still other preferred embodiments according to the
cutting tips of this invention differ from the above described
embodiments in that the facets are flat or convex, or that the
cutting tips have differing numbers of facets or differing shapes,
may be made of different materials, may have friction reducing
elements applied thereto such as polytetrafloroethylene (PTFE), and
may have different numbers of cutting edges associated
therewith.
[0033] The cutting tips according to this invention overcome
deficiencies inherit in prior art cutting tips. The cutting tips
according to this invention have sharper edges while retaining
optimal strength and optimal material pushing capabilities. The
cutting tips as according to this invention provide for a more
lethal arrowhead tip that is capable of deeper penetration than
prior art arrowhead tips. The cutting tips according to this
invention are also simple and feasible to manufacture.
[0034] With the above objects and advantages in view, other objects
and advantages of the invention will more readily appear as the
nature of the invention is better understood, the invention is
comprised in the novel construction, combination and assembly of
parts hereinafter more fully described, illustrated, and
claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] FIG. 1 is a side view of a cutting tip according to one
preferred embodiment of this invention;
[0036] FIG. 2 is another side view of the cutting tip of FIG.
1;
[0037] FIG. 3 is a top view of the cutting tip of FIG. 1;
[0038] FIG. 4 is a cross-sectional view of the cutting tip of FIG.
1 taken along line 4-4;
[0039] FIG. 5 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 4;
[0040] FIG. 6 is a side view of a fixed-blade arrowhead with a
cutting tip according to a preferred embodiment of this
invention;
[0041] FIG. 7 is a side view of a blade-opening arrowhead with a
cutting tip according to a preferred embodiment of this invention,
showing the pivotal blades in the closed position;
[0042] FIG. 8 is a side view of the blade-opening arrowhead as
illustrated in FIG. 7 showing the pivotal blades in the open
position;
[0043] FIG. 9 is a side view of a blade-opening arrowhead similar
to the blade-opening arrowhead as illustrated in FIGS. 7 & 8
except the cutting tip is integral with the arrowhead body.
[0044] FIG. 10 is a side view of a surgical trocar with a removably
attachable cutting tip as according to a preferred embodiment of
this invention;
[0045] FIG. 11 is a side view of another surgical trocar with an
integral cutting tip as according to a preferred embodiment of this
invention;
[0046] FIG. 12 is a side view of a three faceted hollow ground
cutting tip;
[0047] FIG. 13 is a top view of the cutting tip as illustrated in
FIG. 12;
[0048] FIG. 14 is a side view of a grinding wheel;
[0049] FIG. 15 is an illustration of the three dimensions as
depicted with a Cartesian X-Y-Z axis system;
[0050] FIG. 16 is a top view of the cutting tip as illustrated in
FIG. 13 showing a grinding wheel grinding a bevel on the cutting
tip;
[0051] FIG. 17 is a side view of the cutting tip and grinding wheel
as illustrated in FIG. 16;
[0052] FIG. 18 is a side view of another grinding wheel;
[0053] FIG. 19 is a side view of another grinding wheel;
[0054] FIG. 20 is a side view of another three faceted hollow
ground cutting tip;
[0055] FIG. 21 is a top view of the cutting tip as illustrated in
FIG. 20;
[0056] FIG. 22 is a side view of another grinding wheel;
[0057] FIG. 23 is an illustration of the three dimensions as
depicted with a Cartesian X-Y-Z axis system;
[0058] FIG. 24 is a top view of the cutting tip as illustrated in
FIG. 21 showing a grinding wheel grinding a bevel on the cutting
tip;
[0059] FIG. 25 is a side view of the cutting tip and grinding wheel
as illustrated in FIG. 24;
[0060] FIG. 26 is a cross-sectional view of another cutting tip as
according to this invention;
[0061] FIG. 27 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 26;
[0062] FIG. 28 is a cross-sectional view of another cutting tip as
according to this invention;
[0063] FIG. 29 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 28;
[0064] FIG. 30 is a cross-sectional view of another cutting tip as
according to this invention;
[0065] FIG. 31 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 30;
[0066] FIG. 32 is a cross-sectional view of another cutting tip as
according to this invention;
[0067] FIG. 33 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 32;
[0068] FIG. 34 is a cross-sectional view of another cutting tip as
according to this invention;
[0069] FIG. 35 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 34;
[0070] FIG. 36 is a side view of another cutting tip as according
to this invention;
[0071] FIG. 37 is another side view of the cutting tip as
illustrated in FIG. 36;
[0072] FIG. 38 is a top view of the cutting tip as illustrated in
FIG. 36;
[0073] FIG. 39 is a cross-sectional view of the cutting tip as
illustrated in FIG. 36 taken along line 39-39;
[0074] FIG. 40 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 39;
[0075] FIG. 41 is a side view of another cutting tip as according
to this invention;
[0076] FIG. 42 is another side view of the cutting tip as
illustrated in FIG. 41;
[0077] FIG. 43 is a top view of the cutting tip as illustrated in
FIG. 41;
[0078] FIG. 44 is a cross-sectional view of the cutting tip as
illustrated in FIG. 41 taken along line 44-44;
[0079] FIG. 45 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 44;
[0080] FIG. 46 is a side view of a fixed-blade arrowhead with a
cutting tip according to a preferred embodiment of this
invention;
[0081] FIG. 47 is a side view of a blade-opening arrowhead with an
integral cutting tip according to a preferred embodiment of this
invention, showing the pivotal blades in the open position;
[0082] FIG. 48 is a side view of a surgical trocar with a removably
attachable cutting tip as according to a preferred embodiment of
this invention;
[0083] FIG. 49 is a side view of another surgical trocar with an
integral cutting tip as according to a preferred embodiment of this
invention;
[0084] FIG. 50 is a cross-sectional view of another cutting tip as
according to this invention;
[0085] FIG. 51 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 50;
[0086] FIG. 52 is a cross-sectional view of another cutting tip as
according to this invention;
[0087] FIG. 53 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 51;
[0088] FIG. 54 is a side view of another cutting tip as according
to a preferred embodiment of this invention showing a hone
bevel;
[0089] FIG. 55 is a cross-sectional view of the cutting tip as
illustrated in FIG. 54 taken along line 55-55;
[0090] FIG. 56 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 55;
[0091] FIG. 57 is an enlarged view of a cutting edge from the
cross-sectional view of another cutting tip as according to this
invention showing another hone bevel;
[0092] FIG. 58 is an enlarged view of a cuffing edge from the
cross-sectional view of another cutting tip as according to this
invention showing another hone bevel;
[0093] FIG. 59 is a cross-sectional view of another cutting tip as
according to this invention;
[0094] FIG. 60 is an enlarged view of a cutting edge from the
cross-sectional view of FIG. 59;
[0095] FIG. 61 is a side view of another cutting tip as according
to this invention;
[0096] FIG. 62 is another side view of the cutting tip as
illustrated in FIG. 61;
[0097] FIG. 63 is a top view of the cutting tip as illustrated in
FIG. 61;
[0098] FIG. 64 is a cross-sectional view of the cutting tip as
illustrated in FIG. 61 taken along line 64-64;
[0099] FIG. 65 is a cross-sectional view of another cutting tip as
according to this invention;
[0100] FIG. 66 is a side view of another cutting tip as according
to this invention;
[0101] FIG. 67 is a cross-sectional view of the cutting tip as
illustrated in FIG. 66 taken along line 67-67;
[0102] FIG. 68 is an exploded side view of the cutting tip as
according to the preferred embodiment of this invention as
illustrated in FIG. 66 showing the cutting tip with the tip blades
removed;
[0103] FIG. 69 is a side view of another cutting tip as according
to this invention;
[0104] FIG. 70 is a top view of the cutting tip as illustrated in
FIG. 69;
[0105] FIG. 71 is a cross-sectional view of the cutting tip as
illustrated in FIG. 69 taken along line 71-71;
[0106] FIG. 72 is a cross-sectional view of the cutting tip as
illustrated in FIG. 69 taken along line 72-72;
[0107] FIG. 73 is a side view of another cutting tip as according
to this invention;
[0108] FIG. 74 is a cross-sectional view of the cutting tip as
illustrated in FIG. 73 taken along line 74-74;
[0109] FIG. 75 is a cross-sectional view of the cutting tip as
illustrated in FIG. 73 taken along line 75-75;
[0110] FIG. 76 is an exploded side view of the cutting tip as
according to the preferred embodiment of this invention as
illustrated in FIG. 73 showing the cutting tip with the tip blades
removed;
[0111] FIG. 77 is a side view of another cutting tip as according
to this invention;
[0112] FIG. 78 is a top view of the cutting tip as illustrated in
FIG. 77;
[0113] FIG. 79 is a top view of another cutting tip as according to
this invention;
[0114] FIG. 80 is a top view of another cutting tip as according to
this invention;
[0115] FIG. 81 is a top view of another cutting tip as according to
this invention;
[0116] FIG. 82 is a side view of another cutting tip as according
to this invention;
[0117] FIG. 83 is a top view of the cutting tip as illustrated in
FIG. 82;
[0118] FIG. 84 is an exploded side view of the cutting tip as
illustrated in FIG. 82 showing two tip blades detached from the
cutting tip;
[0119] FIG. 85 is a side view of a blade-opening arrowhead with a
cutting tip as according to a preferred embodiment of this
invention, showing the pivotal blades in the open position;
[0120] FIG. 86 is a side view of another blade-opening arrowhead
similar to the blade-opening arrowhead as illustrated in FIG. 85
except for the cutting tip is integral with the arrowhead body.
[0121] FIG. 87 is a cross-sectional view of the cutting tip as
illustrated in FIG. 86 taken along line 87-87;
[0122] FIG. 88 is a cross-sectional view of another cutting tip as
according to this invention;
[0123] FIG. 89 is an exploded side view of an arrowhead body and
cutting tip as according to this invention;
[0124] FIG. 90 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 89;
[0125] FIG. 91 is a side view of another tip blade as according to
a preferred embodiment to this invention;
[0126] FIG. 92 is an exploded side view of an arrowhead body and
cutting tip as according to this invention;
[0127] FIG. 93 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 92;
[0128] FIG. 94 is a side view of an arrowhead body and cutting tip
as according to this invention;
[0129] FIG. 95 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 94;
[0130] FIG. 96 is a perspective view of the tip blade as
illustrated in FIGS. 94 & 95; FIGS. 97a-c show other tip blades
as according to other preferred embodiments of this invention;
[0131] FIG. 98 is a side view of an arrowhead body and cutting tip
as according to this invention;
[0132] FIG. 99 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 98;
[0133] FIG. 100 is a side view of an arrowhead body and cutting tip
as according to this invention;
[0134] FIG. 101 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 100;
[0135] FIG. 102 shows another tip blade as according to another
preferred embodiment of this invention;
[0136] FIG. 103 is a side view of a fixed-blade arrowhead with a
cutting tip as according to a preferred embodiment of this
invention;
[0137] FIG. 104 is a top view of the fixed-blade arrowhead as
illustrated in FIG. 103;
[0138] FIG. 105 is an exploded side view of the arrowhead body and
cutting tip of the arrowhead as illustrated in FIG. 103;
[0139] FIG. 106 is a partially sectioned side view of the assembled
arrowhead components as illustrated in FIG. 105;
[0140] FIG. 107 is a side view of another fixed-blade arrowhead
blade according to another preferred embodiment of this
invention;
[0141] FIG. 108 is a top view of another fixed-blade arrowhead
having a cutting tip as according to another preferred embodiment
of this invention;
[0142] FIG. 109 is a partially sectioned side view of the arrowhead
body and cutting tip as according to the preferred embodiment of
this invention as illustrated in FIG. 108;
[0143] FIG. 110 is a side view of a tip blade of the cutting tip of
the fixed-blade arrowhead of this invention as illustrated in FIGS.
108 & 109;
[0144] FIG. 111 is an exploded side view of another cutting tip as
according to this invention;
[0145] FIG. 112 is a side view of another cutting tip as according
to this invention;
[0146] FIG. 113 is a cross-sectional view of the cutting tip as
illustrated in FIG. 112 taken along line 113-113;
[0147] FIG. 114 is a top view of another cutting tip as according
to this invention;
[0148] FIG. 115 is a side view of the cutting tip of this invention
as illustrated in FIG. 114;
[0149] FIG. 116 is a top view of another cutting tip as according
to this invention;
[0150] FIG. 117 is a side view of the cutting tip of this invention
as illustrated in FIG. 116; and
[0151] FIGS. 118-131 are cross-sectional views of yet other cutting
tips as according to this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0152] FIGS. 1-5 illustrate a preferred embodiment of this
invention, wherein a cutting tip 200 has three hollow ground facets
400-400-400. Each facet 400 is ground upon a barrel section 900 of
cutting tip 200. Cutting tip 200 tapers to a pointed apex 376 at
its forward leading end as illustrated in FIG. 1. Each facet 400
has a bevel 500 ground thereon. Bevels 500-500-500 create a sharper
cutting edge 300 at the facet junctures of cutting tip 200 than is
attainable by a conventional trocar tip having only hollow ground
facets, while allowing cutting tip 200 to retain sufficient
structural facet strength to crush/split heavy bone and easily push
penetrated material from its cutting path. Each facet 400 has a
pair of facet boundaries. Each facet boundary is defined by a
cutting edge 300 where a facet 400 adjoins an adjacent facet 400. A
facet 400 and other facets of the other preferred cutting tip
embodiments of this invention is therefore generally defined as the
cutting tip structure between the pair of facet boundaries or
cutting edges of the respective facet. Therefore each bevel is part
of its accompanying facet. Each bevel 500 creates a bevel boundary
600 upon its corresponding facet 400. Each bevel boundary 600 marks
the location on each facet 400 where the slope of the corresponding
facet 400 changes, as is readily determined by observation of a
cross-sectional view of cutting tip 200 such as is illustrated in
FIG. 4. The cross-sectional views of cutting tip 200 as shown in
FIGS. 4 & 5 are taken in a plane perpendicular to a central
longitudinal axis 1010 of cutting tip 200. Central longitudinal
axis 1010 is collinear with the Y-axis of a Cartesian X-Y-Z axis
system as illustrated in FIGS. 1 & 4. A facet bisecting plane
660 as also illustrated in FIGS. 1 & 4 bisects each facet 400
into two longitudinal halves. Each bevel 500 of cutting tip 200 is
substantially on only one bisected side of its corresponding facet
400. As illustrated in FIG. 1 bevel 500 is on the right side of
corresponding bisecting plane 660. As also illustrated in FIG. 1
facet bisecting plane 660 is coplanar with the Y-Z plane (coming
out of the page).
[0153] As illustrated in FIG. 5 an enlarged cross-sectional view of
one of the cutting edges 300 of cutting tip 200 clearly shows that
a proximal angle 670 has an angle of measure that is less than the
angle of measure of a distal angle 672 which therefore gives each
cutting edge 300 of cutting tip 200 a true cutting edge and
therefore its razor or scalpel sharpness, while retaining the
optimally desired facet structure. A true cutting edge is a cutting
edge that has a small enough angle between opposing structure such
as facets or sides so as to make it as sharp as a razor blade or
scalpel blade. It is within the desired results of this invention
to provide cutting tips, such as three faceted hollow ground trocar
tips that have such a true cutting edge located at each facet
juncture. However, it is apparent that obtaining such a fine or
small angle so as to produce a true cutting edge between opposing
facets or other structures of the cutting tips as according to this
invention is not of necessity a requirement for all cutting tips as
according to this invention, but rather the creation of a finer or
sharper edge than prior art cutting tips possess at their facet
junctures and/or at their other structural sections. Proximal angle
670 has preferably an angular measure of between 10 and 35 degrees,
but is not intended to be limited thereto. Proximal angle 670 is
determined by measuring the angle in a plane perpendicular to
central longitudinal axis 1010 of cutting tip 200 between a pair of
proximal angle measuring reference points 1000 & 1002 and
cutting edge 300. Distal angle 672 is determined by measuring the
angle in the same perpendicular plane to central longitudinal axis
1010 of cutting tip 200 between a pair of distal angle measuring
reference points 1004 & 1006 and cutting edge 300.
[0154] It is apparent that the method of determining the angle that
adjoining facets, bevels or their equivalents are offset from each
other with respect to the shape of their corresponding cutting tips
and cutting edges as according to this invention may not have to be
referenced from the corresponding cutting edge it self.
[0155] Proximal angle 670 and other proximal angles or their
equivalents as according to the desired results of this invention
which create an angle of measure that is less than distal angle 672
or other similar corresponding distal angles or their equivalents
as according to this invention may be any angle that has angle
measuring reference points located a distance from their
corresponding cutting edge less than the distance their
corresponding bevel boundary is from the cutting edge, as
referenced in a plane perpendicular to the central longitudinal
axis of the respective cutting tip. Distal angle 672 and other
distal angles or their equivalents as according to the desired
results of this invention which create an angle of measure that is
greater than proximal angle 670 or other similar proximal angles or
their equivalents as according to this invention therefore may be
any angle that has angle measuring reference points located a
distance from their corresponding cutting edge not less than the
distance their corresponding bevel boundary is from the cutting
edge, as referenced in a plane perpendicular to the central
longitudinal axis of the respective cutting tip.
[0156] It is apparent that each point of a pair of angle measuring
reference points used to determine the angle of measure, and
therefore the angular offset of opposing cutting tip structural
sections, whether a proximal angle or a distal angle as according
to this invention, need not necessarily be the same distance from
their corresponding cutting edge.
[0157] FIGS. 6-11 illustrate examples of types of devices that have
a leading penetrating end used for penetrating substances which
cutting tip 200 or other cutting tips as according to this
invention can be associated with as according to the scope of this
invention. FIG. 6 illustrates a fixed-blade arrowhead 702 that has
cutting blades 722-722-722 and cutting tip 200 removably attached
to an arrowhead body 732. FIGS. 7 & 8 illustrate a
blade-opening arrowhead 700 that has pivotal cutting blades
720-720-720 and cutting tip 200 removably attached to an arrowhead
body 730. FIG. 7 shows pivotal blades 720-720-720 in the closed or
in-flight position, whereas FIG. 8 shows pivotal blades 720-720-720
in the open cutting position. FIG. 9 shows a blade-opening
arrowhead 704 similar to blade-opening arrowhead 700 as illustrated
in FIGS. 7 & 8 except for a cutting tip 204 is integrally
attached with an arrowhead body 731. FIG. 10 illustrates a surgical
trocar 706 that has a cannula 740 or trocar tube, a mandrel shank
744 or trocar obturator shank with cutting tip 200 removably
attached thereto. FIG. 11 illustrates another surgical trocar 708
similar to surgical trocar 706 except for a cutting tip 202 is
integrally attached with a mandrel shank 742.
[0158] The cutting tips according to this invention are preferably
fabricated from metal stock material such as 400 series stainless
steels, titanium alloys--including beta alloys, ferrous steels and
carbides, but may be fabricated in their entirety or in part from
other metals and non-metals such as organic polymers, composites or
any combination of such materials or any other plausible
materials.
[0159] It is apparent that friction reducing elements such as
polytetrafloroethylene (PTFE) may be applied to the cutting tips of
this invention, especially to the cutting tips fabricated of metal,
to enhance their penetrating qualities.
[0160] FIGS. 12-17 illustrate in part a method of manufacturing
cutting tip 200. FIG. 12 shows a conventional three faceted hollow
ground trocar tip, that had its facets 400-400-400 ground by a
grinding wheel 800 as illustrated in FIG. 14. Grinding wheel 800
has a radius of rotation 804, an axial thickness 802 and an
exterior circumferential profile 836. Grinding wheel 800 is a type
of rotational machining tool as according to this invention,
because it rotates about an axis or spins and when shaping or
forming objects. Other rotational machining tools as according to
this invention comprise mill cutter heads, sanding wheels and any
other type of shape forming device that rotates around at least one
axis. In FIG. 14 radius of rotation 804 is depicted as the greatest
radius of grinding wheel 800, but it is apparent that the radius of
rotation 804 of grinding wheel 800 and the radiuses of rotation of
other grinding wheels and rotational machining tools as according
to this invention may be any actual radial length possessed by the
rotational machining tool or grinding wheel, since such grinding
wheels and/or rotational machining tools may have changing radial
lengths throughout their axial thickness as does grinding wheel
800. The exterior circumferential profile of a rotational machining
tool of this invention refers to surface shape of the part of the
rotational machining tool that is actually contacting the object
being formed, manufactured or ground. Although grinding wheel 800
forms each hollow ground facet 400 of cutting tip 200 by exterior
circumferential profile 836 section of grinding wheel 800 removing
cutting tip stock material during the grinding process, it is
apparent that a section 837 of grinding wheel 800 could be used to
grind or fabricate a facet, particularly a flat facet, of a cutting
tip as according to this invention wherein section 837 would be an
exterior circumferential profile.
[0161] FIG. 13 illustrates that the axis of rotation 1008 of
grinding wheel 800, when grinding wheel 800 is grinding a facet 400
upon cutting tip 200, is substantially parallel to central
longitudinal axis 1010 or the Y-axis, and is perpendicular to both
the X-axis and Z-axis. Axis of rotation 1008 of grinding wheel 800,
when grinding wheel 800 is grinding each facet 400 upon cutting tip
200, is therefore not inclined relative to any of the X, Y, or Z
axises nor any of the three dimensions--their corresponding two
dimensional planes; X-Z, X-Y, Y-Z. The term inclined as according
to this invention has the intended meaning of being neither
perpendicular nor parallel.
[0162] Axis of rotation 1008 of grinding wheel 800 when grinding
wheel 800 is grinding each facet 400 upon cutting tip 200, is
orientated with respect to the X-Y-Z axis system of cutting tip 200
in a specific spatial orientation. A spatial orientation as
according to this invention refers to the three-dimensional
occupancy of space, and particularly to the three-dimensional
occupancy of space that axises of rotation of grinding wheels
and/or rotational machining tools are oriented with respect to a
corresponding Cartesian X-Y-Z axis system of a corresponding
cutting tip.
[0163] FIGS. 16 & 17 show another grinding wheel 806 grinding a
bevel 500 upon one of the facets 400 after grinding wheel 800
formed facets 400-400-400. Grinding wheel 806 has a radius of
rotation 810, an axial thickness 808 and an exterior
circumferential profile 838. The radius of rotation 810 of grinding
wheel 806 is of a different length of radius than the radius of
rotation 804 of grinding wheel 800. The axial thickness 808 of
grinding wheel 806 is of a different thickness than the axial
thickness 802 of grinding wheel 800. The exterior circumferential
profile 838 of grinding wheel 806 is also of a different profile
than the exterior circumferential profile 836 of grinding wheel
800.
[0164] As is illustrated in FIGS. 16 & 17 the axis of rotation
1012 of grinding wheel 806 is inclined relative to each of the X,
Y, and Z axises of a Cartesian X-Y-Z axis system and therefore also
inclined to the corresponding X-Y, X-Z, and Y-Z planes when
grinding wheel 806 is forming each bevel 500 upon cutting tip 200.
Therefore, the axis of rotation 1012 of grinding wheel 806 when
forming a bevel 500 upon a particular facet 400 of cutting tip 200
is oriented with respect to at least one of the X-Y-Z axises and
corresponding three dimensional planes in a different relation or
spatial orientation than the spatial orientation axis of rotation
1008 of grinding wheel 800 is oriented with respect to the X-Y-Z
axises and three dimensional planes when forming the particular
portion of the facet--the primary structure or the hollow ground
facets. Each bevel 500 is substantially on only one bisected side
of its corresponding facet 400, thus grinding wheel 806 when
forming a bevel 500 upon a facet 400 is removing facet material or
cutting tip stock material from only one bisected side of that
facet 400 for a substantial majority of the time that grinding
wheel 806 is forming the particular bevel 500. This is clearly
illustrated in FIG. 16 where the bevel 500 grinding wheel 806 is
shown forming is substantially completely on the right side of
facet bisecting plane 660, which bisecting plane 660 happens to be
aligned coplanar with the Y-Z plane (coming out of the page) as
seen in FIG. 16. Removing facet material or cutting tip stock
material with a grinding wheel or other rotational machining tool
when forming a portion of a facet such as when grinding wheel 806
is forming a bevel 500, is in essence cutting or making a cut from
the cutting tip stock material when fabricating it as according to
this invention.
[0165] FIG. 18 shows a grinding wheel 812 which has a radius of
rotation 816, an axial thickness 814 and an exterior
circumferential profile 840. FIG. 19 shows a grinding wheel 818
which has a radius of rotation 822, an axial thickness 820 and an
exterior circumferential profile 842. Both grinding wheels 812 and
818 could be used to grind bevels similar to bevels 500-500-500
upon facets 400-400-400 of cutting tip 200, however due to their
different exterior circumferential profiles and potentially
different axial thicknesses, potentially different radii of
rotation and the different possible relations their axises of
rotation can be oriented with respect to the three dimensions of
the X-Y-Z axises of corresponding cutting tips, the bevels grinding
wheels 812 and 818 would grind could have a variety of different
shapes, slopes and/or curvatures than that of bevels 500-500-500 as
shown on cutting tip 200.
[0166] FIGS. 20-25 illustrate in part another method of
manufacturing a cutting tip 206 that is similar to cutting tip 200
and similar to the method as disclosed in FIGS. 12-17 except the
method of manufacturing cutting tip 206 as illustrated in FIGS.
20-25 first entails grinding the hollow ground trocar tip facets
402-402-402 by a grinding wheel 824 as illustrated in FIG. 22
wherein the axis of rotation 1014 of grinding wheel 824 is oriented
substantially perpendicular to central longitudinal axis 1018 of
cutting tip 206 when grinding each facet 402 thereon. Grinding
wheel 824 has a radius of rotation 828, an axial thickness 826, and
an exterior circumferential profile 844. Axis of rotation 1014 of
grinding wheel 824 is oriented in a specific spatial orientation
when grinding a hollow ground facet 402 on cutting tip 206,
particularly axis of rotation 1014 is spatially oriented
substantially perpendicular to both a central longitudinal axis
1018 or the Y-axis and to the Z-axis, while being substantially
parallel to the X-axis. Axis of rotation 1014 of grinding wheel
824, when grinding wheel 824 is grinding each facet 402 upon
cutting tip 206, is therefore not inclined relative to any of the
X-Y-Z axises nor any of the three dimensions. FIGS. 24 & 25
show that another grinding wheel 830 next grinds a bevel 502 upon
each of the facets 402 after grinding wheel 824 formed facets
402-402-402. Bevels 502-502-502 create a sharper cutting edge 302
at the facet junctures of cutting tip 206 than is attainable by a
conventional trocar tip having only hollow ground facets as shown
for example in FIGS. 20 & 21, while allowing cutting tip 206 to
retain sufficient structural facet strength to crush/split heavy
bone and easily push penetrated material from its cutting path.
Each bevel 502 creates a bevel boundary 602 upon its corresponding
facet 402. Grinding wheel 830 has a radius of rotation 834, an
axial thickness 832 and an exterior circumferential profile 846.
The radius of rotation 834 of grinding wheel 830 is of a different
length of radius than the radius of rotation 828 of grinding wheel
824. The axial thickness 832 of grinding wheel 830 is of a
different thickness than the axial thickness 826 of grinding wheel
824. The exterior circumferential profile 846 of grinding wheel 830
is also of a different profile than the exterior circumferential
profile 844 of grinding wheel 824.
[0167] As is illustrated in FIGS. 24 & 25 axis of rotation 1016
of grinding wheel 830 is inclined relative to each of the X, and Z
axises in a specific spatial orientation and therefore to two of
the corresponding three dimensional planes--the X-Y, and Y-Z
planes--when grinding wheel 830 is forming each bevel 502 thereon.
However, axis of rotation 1016 of grinding wheel 830 is
perpendicular to the Y-axis or central longitudinal axis 1018 of
cutting tip 206 and is parallel to the X-Z plane when grinding
wheel 830 is forming each bevel 502. Therefore, the axis of
rotation 1016 of grinding wheel 830 when forming a bevel 502 upon a
particular facet 402 of cutting tip 206 is oriented with respect to
at least one of the X-Y-Z axises and corresponding three
dimensional planes in a different relation or spatial orientation
than the spatial orientation axis of rotation 1014 of grinding
wheel 824 is oriented with respect to the X-Y-Z axises and three
dimensional planes when forming the particular facet. Each bevel
502 is substantially on only one bisected side of its corresponding
facet 402, thus grinding wheel 830 when forming a bevel 502 upon a
facet 402 is removing facet material or cutting tip stock material
from only one bisected side of facet 402 for a substantial majority
of the time that grinding wheel 830 is forming the particular bevel
502. This is clearly illustrated in FIG. 24 where the bevel 502
grinding wheel 830 is shown forming is substantially completely on
the right side of facet bisecting plane 660, which bisecting plane
660 happens to be aligned coplanar with the Y-Z plane (coming out
of the page) as seen in FIG. 24.
[0168] It is apparent that the facets of the cutting tips as
according to this invention whether concave/hollow ground or of
some other shape may have each primary facet structure such as
hollow ground facets 402-402-402 of the conventional trocar tip as
illustrated in FIGS. 20 & 21, formed by rotational machining
tools and/or grinding wheels where the axis of rotation of the
rotational machining tool or grinding wheel forming such primary
facet structure is substantially inclined relative to one or more
of the Cartesian X-Y-Z axises and their corresponding three
dimensional planes as has been disclosed in this specification,
when forming the corresponding portion of each facet. The term
primary facet structure refers generally but not limited thereto,
to the facet before a bevel or bevels as according to this
invention are formed or ground thereon so as to create a razor
sharp cutting edge as is according to the desired results of this
invention. Such cutting tips having the primary facet structures or
at least a part of a facet formed by a grinding wheel or rotational
machining tool whose axis of rotation is inclined with respect to
at least one or more of the X-Y-Z axises would then have a bevel or
bevels as according to this invention formed on each facet by a
grinding wheel or rotational machining tool which would have
possibly a different radius of rotation, a different axial
thickness, or a different exterior circumferential profile than the
grinding wheel or rotational machining tool that formed the primary
facet structure. Also, the grinding wheel or rotational machining
tool forming the bevel or bevels on the primary facet structure
could possibly have its axis of rotation when forming the bevel(s)
on a facet of a respective cutting tip, oriented with respect to
the X-Y-Z axises in a different manner or relation than the
inclined manner or relation the grinding wheel or rotational
machining tool that formed the primary facet structure of that
facet was oriented with respect to the X-Y-Z axises when forming
the primary facet structure as according to this invention. Such
different manner or relation of orientation of the axis of rotation
of the rotational machining tool or grinding wheel when forming the
bevel(s) with respect to the X-Y-Z axises could be either inclined
or non-inclined relative to one or more of the X-Y-Z axises and the
corresponding three dimensional planes.
[0169] FIGS. 26-35 illustrate other preferred cutting tip
embodiments as according to the cutting tips of this invention that
have at least a part of their facets substantially concave--which
may have been formed from hollow grinding and/or other fabrication
methods. FIGS. 26 & 27 show cross-sectional views of a three
sided cutting tip 208 having facets 404-404-404, cutting edges
304-304-304, bevels 504-504-504, and bevel boundaries 604-604-604.
FIGS. 28 & 29 show cross-sectional views of a three sided
cutting tip 210 having facets 406-406-406, cutting edges
306-306-306, bevels 506-506-506, and bevel boundaries 606-606-606.
FIGS. 30 & 31 show cross-sectional views of a three sided
cutting tip 212 having facets 408-408-408, cutting edges
308-308-308, bevels 508-508-508, and bevel boundaries 608-608-608.
FIGS. 32 & 33 show cross-sectional views of a three sided
cutting tip 214 having facets 410-410-410, cutting edges
310-310-310, bevels 510-510-510, and bevel boundaries 610-610-610.
FIGS. 34 & 35 show cross-sectional views of a three sided
cutting tip 216 having facets 412-412-412, cutting edges
312-312-312, bevels 512-512-512, and bevel boundaries
612-612-612.
[0170] As is apparent from cutting tips 210 & 212 as
illustrated in FIGS. 28-31 regardless of how small the distal angle
is or how dished-out the concave facets are, a finer or narrower
proximal angle is attainable at the cutting edge or juncture of
adjoining facets by forming a bevel thereon as according to this
invention, and therefore provides a sharper cutting edge than would
of been attainable had the bevel or bevels not been formed.
[0171] FIGS. 36-40 illustrate a cutting tip 218. Cutting tip 218
has facets 414-414-414, cutting edges 314-314-314, bevels
514-514-514, and bevel boundaries 614-614-614. Cutting tip 218 is
similar to the cutting tips described above except that the facets
414-414-414 of cutting tip 218 are substantially flat as is best
seen in FIG. 39. FIG. 40 shows that a proximal angle 674 has an
angle of measure that is less than the angle of measure of a distal
angle 676 as according to the proximal and distal angles of this
invention and therefore gives cutting tip 218 sharper cutting edges
314-314-314 than it would of had if the bevels 514-514-514 had not
been formed thereon. It is apparent that other proximal angles
having an angle of measure that is greater than the angle of
measure of proximal angle 674 are measurable by reference from
other locations along bevel 514 of cutting tip 218. Such other
proximal angles would still have an angle of measure that is less
than the angle of measure of distal angle 676 as is according to
this invention.
[0172] It is apparent that the shape or structure of the facets
according to the cutting tips of this invention may be concave,
flat, convex or have other complex geometries as according to the
scope of this invention.
[0173] FIGS. 41-45 illustrate a cutting tip 220. Cutting tip 220
has facets 416-416-416, cutting edges 316-316-316, bevels
516-516-516-516-516-516, and bevel boundaries
616-616-616-616-616-616. Cutting tip 220 has two bevels 516-516
formed upon each facet 416. It is apparent that more than one bevel
may be formed upon each facet of the cuffing tips as according to
this invention. FIG. 45 shows that a proximal angle 678 has an
angle of measure that is less than the angle of measure of a distal
angle 680 as according to the proximal and distal angles of this
invention and therefore gives cutting tip 220 sharper cutting edges
316-316-316 than it would of had if the bevels had not been formed
thereon.
[0174] FIGS. 46-49 illustrate other arrowheads and surgical trocars
having cutting tips as according to this invention at their leading
penetrating ends. FIG. 46 illustrates a fixed-blade arrowhead 752
that has cutting blades 722-722-722 and cutting tip 220 removably
attached to arrowhead body 732. FIG. 47 illustrates a blade-opening
arrowhead 750 that has pivotal cutting blades 720-720-720 and
cutting tip 222 integrally attached to or with arrowhead body 731.
FIG. 48 illustrates a surgical trocar 754 that has a cannula 740 or
trocar tube, a mandrel shank 744 or trocar obturator shank with
cutting tip 220 removably attached thereto. FIG. 49 illustrates
another surgical trocar 756 similar to surgical trocar 754 except
for a cutting tip 224 is integrally attached with a mandrel shank
742.
[0175] FIGS. 50-53 illustrate other examples of cutting tips as
according to this invention that have two bevels upon each facet
such that one bevel of each adjoining facet communicates with each
cutting edge. FIGS. 50-51 illustrate a cutting tip 226. Cutting tip
226 has flat facets 418-418-418, cutting edges 318-318-318, bevels
518-518-518-518-518-518, and bevel boundaries
618-618-618618-618-618. FIGS. 52-53 illustrate a cutting tip 228.
Cutting tip 228 also has flat facets 420-420-420, cutting edges
320-320-320, bevels 520-520-520-520-520-520, and bevel boundaries
620-620620-620-620-620.
[0176] It is apparent that cutting tips as according to this
invention could have facets that have only one bevel formed thereon
while having other facets that have a plurality of bevels formed
thereon.
[0177] FIGS. 54-56 illustrate a cutting tip 230. Cutting tip 230
has hollow ground facets 422-422-422, cutting edges 322-322-322,
bevels 526-526-526, hone bevels 528-528-528, and bevel boundaries
622-622-622. Hone bevels 528-528-528 serve to provide cutting tip
230 and other cutting tips as according to this invention that have
hone bevels or their equivalents with a slightly stronger cutting
edge as is commonly done with razor blades, scalpels and other
cutting knife type blades, which are generally fabricated from the
process of strip grinding. As illustrated in FIG. 56 a proximal
angle 690 has an angle of measure that is less than a distal angle
692 as according to this invention. The dotted lines 1032 &
1036 of angle 692 do not intersect each other at cutting edge 322
nor do the dotted lines 1036 & 1034 of angle 690 intersect each
other at cutting edge 322. This is an example as according to this
invention of how the method of determining the angle or angles that
adjoining facets, bevels, other cutting tip structures or their
equivalents are offset from each other with respect to the shape of
their corresponding cutting tips and cutting edges as according to
this invention, may not involve referencing from the corresponding
cutting edge, but which still determine true angular offsets of
such structures.
[0178] It is apparent that a proximal angle of less degrees in
measure than a distal angle as according to this invention is
attainable with cutting tip 230 and other similar preferred cutting
tip embodiments of this invention having hone bevels despite the
fact that each hone bevel, as for example hone bevels 528-528-528
of cutting tip 230, creates a wider angle than the corresponding
proximal angle of the cutting tip in reference at a location closer
to the corresponding cutting edge than the structure of the cutting
tip that was used in reference to determine the angle of measure of
the comparative proximal angle. Such a wider angle, or wider angles
therefore could be determined as according to one measuring method
by angular measuring reference points that are closer to
corresponding cutting edges than the angular measuring reference
points of the corresponding comparative proximal angle or proximal
angles of the cutting tip and cutting edge in reference as has been
defined in this specification.
[0179] FIGS. 57 & 58 illustrate a cutting tip 234 and a cutting
tip 236. Cutting tips 234 & 236 are identical to each other in
certain structural features such as they each have facets
426-426-426, bevels 530-530-530, and bevel boundaries 626-626-626.
Cutting tips 234 & 236 however differ from each other in the
location of their hone bevels and therefore the location of their
cutting edges. Each hone bevel 532 of cutting tip 234 is located on
the left side of its accompanying cutting edge 326 as seen when
viewed from above in cross-section as depicted in FIG. 58, whereas
each hone bevel 534 of cutting tip 236 is located on the right side
of its accompanying cutting edge 328 as seen when viewed from above
in cross-section as depicted in FIG. 57.
[0180] The bevel boundaries of the cutting tips as according to
this invention generally define a location or boundary upon
respective cutting tips where the structure of the cutting tip,
particularly facets or area between cutting edges, change slope or
change shape. Such change in slope or shape is generally best seen
from cross-sectional views of the cutting tips but is also readily
apparent from side views and top views of the respective cutting
tips. It is apparent that the cutting tips as according to this
invention having hone bevels or equivalents may also have hone
bevel boundaries.
[0181] FIGS. 59 & 60 illustrate a cutting tip 232. Cutting tip
232 has facets 424-424-424, cutting edges 324-324-324, bevels
522-522-522-522-522-522, hone bevels 524-524-524-524-524-524 and
bevel boundaries 624-624-624-624-624-624. As is clearly evident
from the enlarged view of one of the cutting edges 324 of cutting
tip 232 as illustrated in FIG. 60, each cutting edge 324 has two
hone bevels 524-524 situated on opposite sides thereof.
[0182] FIGS. 61-64 illustrate a cutting tip 238, yet another
preferred embodiment as according to this invention. Cutting tip
238 has concave facets 430-430-430, cutting edges 330-330-330, flat
planar bevels 536-536-536-536-536-536, and bevel boundaries
630-630-630-630-630-630. FIG. 64 illustrates that a proximal angle
686 has an angle of measure that is less than the angle of measure
of a distal angle 688 as according to the proximal and distal
angles of this invention and also that a proximal angle 682 has an
angle of measure that is less than the angle of measure of a distal
angle 684. Angles 682 & 684 of FIG. 64 illustrate another
example showing that the manner of determining the angle of measure
of a particular structure or section of a cutting tip as according
to this invention is not limited exclusively to angular measuring
reference points and distances they are displaced from their
corresponding cutting edges. For example, even though dotted lines
1020 & 1022 of angle 684 intersect adjoining facets 430-430 at
facet bisecting planes 660-660 and do not conjoin at a cutting edge
330 but rather at a point 1030 along one of the facet bisecting
planes 660, which coincidently bisects angle 684 into two
substantially equal halves, they accurately represent an angle that
adjoining facets 430-430 are offset from each other with respect to
the shape of a section of cutting tip 238 that is distal or further
from the cutting edge than the corresponding bevel boundaries
630-630.
[0183] The term distal as used throughout this specification refers
to being further away from whereas the term proximal refers to
being closer to. Distal and proximal have been referenced from
corresponding cutting edges with respect to proximal and distal
angles, so therefore distal angles are determined from the angular
offset of opposing cutting tip structures, such a facets and
bevels, that are located a distance further from the cutting edge
than opposing cutting tip structures that determine the angular
offset of proximal angles, regardless of the cutting tip geometry,
as has been discussed herein.
[0184] It is apparent that there exists a variety of angle
measuring methods, some of which have been discussed herein, to
determine that a particular section of a cutting tip, as according
to this invention, which is located substantially closer to a
corresponding cutting edge has a finer or narrower angle than a
section of the same cutting tip located a distance substantially
further from the same corresponding cutting edge, which generally
but not limited to is determined as in a plane perpendicular to the
central longitudinal axis of the respective cutting tip. Such
cutting tips as according to the desired results of the cutting
tips of this invention overcome deficiencies inherent in prior art
cutting tips by providing a razor sharp cutting edge in combination
with optimally desirable strong and durable facet structure.
[0185] FIG. 65 illustrates a cutting tip 240. Cutting tip 240 has
convex facets 432-432-432, cutting edges 332-332-332, flat planar
bevels 538-538-538-538-538-538, and bevel boundaries
632-632632-632-632-632. Cutting tip 240 is similar to cutting tip
238 as illustrated in FIGS. 61-64, except cutting tip 240 has
convex or outwardly bulging facets, and therefore is a generally
conical shaped cutting tip.
[0186] Although the cutting tips as according to this invention
that are fabricated by machining i.e. screw machines, grinding
etc.--are preferably fabricated from round bar or rod stock, such
as 12 foot lengths of stainless steel bar, it is apparent that a
step in the manufacturing process to produce cutting tips as
according to this invention could involve impact swaging of pellets
or slugs to form at least part of the primary shape or structure of
a cutting tip, wherein after the razor sharp cutting edges and/or
bevels could be ground thereon after hardening was completed.
Impact swaging could allow cutting tips, as according to some of
the preferred embodiments of this invention which have facet
structures that are complex and costly to machine such as the
convex facets 432-432-432 of cutting tip 240, to be economically
and quickly produced.
[0187] It is apparent that flat bevels such as bevels 538 of
cutting tip 240 as illustrated in FIG. 65 could be swaged or formed
during impact swaging and that hone bevels or other bevels, such as
curved bevels could then be ground or formed thereon to provide a
sharper cutting edge as according to the desired results of this
invention.
[0188] FIGS. 66-68 illustrate a cutting tip 242. Cutting tip 242
differs from the other cutting tips of this invention that have
been heretofore disclosed in that cutting tip 242 has attachable
tip blades 350-350-350, which each fit into a corresponding slot
910 of a metal tip body 1040 as is illustrated in FIG. 68. Tip
blades 350-350-350 each have a pair of bevels 540-540 and a cutting
edge 334. Each tip blade 350 abuts against a nipple 908 of tip body
1040 and against a pair of bevel boundaries 628-628 when attached
thereto. Nipple 908 is preferably integral with tip body 1040. Tip
blades 350-350-350 are preferably welded integrally to tip body
1040. It is apparent that tip blades 350-350-350 and other tip
blades or their equivalents as according to this invention may be
attached to tip bodies, whether of metal construction, polymer or
of other materials or combinations thereof, by a variety of
different methods including glueing, welding, molding, and by
modifications in the shapes of the tip blades and/or tip
bodies.
[0189] FIGS. 69-72 illustrate a cutting tip 244. Cutting tip 244
differs from the other cutting tips of this invention that have
been heretofore disclosed in that cutting tip 244 has three
integral cutting edges 336-336-336 that each extend substantially
the full length of cutting tip 244 from the junctures between the
facets rearward along a barrel section 906. A pair of bevel
boundaries 634a-634a defines the boundary of a corresponding pair
of bevels 542-542 with corresponding facets, as is illustrated in
FIG. 71. Another pair of bevel boundaries 634b-634b defines the
boundary of a pair of corresponding bevels 544-544 with barrel
section 906, as is illustrated in FIG. 72. Cutting edge 336 between
each pair of adjoining facets is coplanar or in-line with the
section of cutting edge 336 that extends rearward upon barrel
section 906.
[0190] FIGS. 73-76 illustrate a cutting tip 246. Cutting tip 246 is
similar to cutting tip 244 as illustrated in FIGS. 69-72 except for
the three cutting edges 338-338-338 of cutting tip 246 are the
razor edges of attachable tip blades 352-352-352, which each fit
into a corresponding slot 912 of a metal tip body 1042 as is
illustrated in FIG. 76. Tip blades 352-352-352 each have a pair of
bevels 546-546 that are situated between adjacent facets and form
bevel boundaries 636a-636a thereat. Each tip blade 352 also has a
pair of bevels 548-548 that run along barrel section 907 and form
bevel boundaries 636b-636b thereat.
[0191] FIGS. 77-81 illustrate cutting tips 248, 250, 252 & 254
which all in common have bevels on both sides of their facet
junctures such that the bevels do not extend completely to the
forward leading apex of their respective cutting tips. Cutting tip
248 as illustrated in FIGS. 77 & 78 has three facets
434-434-434, a pair of bevels 550-550 that forms each cutting edge
340 and a three sided apex 917. It is apparent that each side of
apex 917 could be hollow ground and therefore substantially
concave. Each facet has a curved section 552 between bevels 550-550
thereon. It is apparent that the facets of cutting tip 248 could be
cut or formed at least in part from a rotational machining tool
whose axis of rotation changes in spatial orientation relative to
the X-Y-Z axises of cutting tip 248 while forming a complete cut or
at least a portion thereof. Cutting tip 248 has a barrel section
914 that is necked down as illustrated in FIG. 77. Cutting tip 250
as illustrated in FIG. 79 has four facets each with a cutting edge
342 that extends from between facet junctures rewards upon barrel
section 914 thereof. Cutting tip 252 as illustrated in FIG. 80 is
similar to cutting tip 250 except the four cutting edges
344-344-344-344 of cutting tip 252 are found only along the
junctures between the respective facets. Cutting tip 254 as
illustrated in FIG. 81 has a substantially blunt apex 916, and four
flat planar facets each with a cutting edge 346 that is found only
along the junctures between the respective facets.
[0192] It is apparent that the cutting tips of this invention may
have cutting edges as according to this invention along any axial
length of their structure, whether integrally formed with,
integrally attached or removably attachable to their respective
cutting tips. It is also apparent that the cutting edges of a
cutting tip as according to this invention may be aligned or
oriented with respect to the central longitudinal axis thereof, the
three dimensions as depicted in this specification by a Cartesian
X-Y-Z axis system wherein the Y-axis is collinear with the central
longitudinal axis thereof, and the facet junctures of their
respective cutting tip in a variety of different manners. Such
different aligned or oriented manners of the cutting edges include
being inclined relative to one or more of the X, Y or Z axises and
not being coplanar with a corresponding facet juncture. It is also
apparent that cutting edges as according to this invention that are
situated upon the barrel sections or equivalents of their
respective cutting tips may be aligned or oriented with respect to
the facet junctures of their cutting tips in a variety of manners,
including not being in-line or coplanar with them.
[0193] FIGS. 82-84 illustrate a cutting tip 256. Cutting tip 256
has attachable tip blades 354-354-354 each having a cutting edge
348 and a pair of bevels 554-554. Each tip blade 354 fits into a
slot 920 in the barrel section 918 of tip body 1044 where a pair of
bevel boundaries 640-640 contact each tip blade 354. Tip body 1044
is preferably of a metal construction and tip blades 354-354-354
are preferably non-removably attached to tip body 1044 by welding,
such as capillary welding or other welding techniques, but not
limited thereto.
[0194] FIG. 85 illustrates a blade-opening arrowhead 758 with
cutting tip 256 attached at the leading penetrating end.
[0195] FIGS. 86 & 87 illustrate a cutting tip 258 similar to
cutting tip 256, but which is integrally attached with an arrowhead
body 734 of a blade-opening arrowhead 760.
[0196] FIG. 88 illustrates a cross-section of a cutting tip 259
which is similar to cutting tip 258 of blade-opening arrowhead 734,
except the tip blades are integrally fabricated with cutting tip
259.
[0197] Securement means as according to this invention has the
intended meaning that a removably attachable tip blade or
equivalent is retained in a cutting position when assembled with or
to a corresponding tip body such that a plane perpendicular to the
central longitudinal axis of the cutting tip intersects both a
holding element, and a portion of the tip blade that is situated
closer to the central longitudinal axis of the cutting tip than the
holding element. Holding elements as according to this invention
comprise portions of tip bodies, arrowhead bodies or mandrels,
arrowhead blades, or other suitable structure or structures of the
penetrating device utilizing such a cutting tip as according to
this invention, or any combination of such structures that serve to
limit undesired displacement or movement of tip blades. In this
manner the tip blades will engage against the holding element or
elements and therefore resist displacement in a radial direction as
well as in axial directions from the tip body, thus securing the
tip blades to their respective cutting tips.
[0198] FIGS. 89 & 90 illustrate an example of securement means
as according to this invention where a cutting tip 260 is shown to
be removably attachable to a blade-opening arrowhead body. Cutting
tip 260 has three facets, three slots 928-928-928 each with a
catch-lip 926, three removably attachable tip blades 356-356-356
(only two tip blades 356-356 are shown for reasons of simplicity
and illustration), and a tip body 1046 having an internally
threaded female cavity 930 that threads onto a threaded male stud
762 of the arrowhead body. Each tip blade 356 has a notch 932 and a
protrusion 933. Therefore, when tip blades 356-356-356 are inserted
into slots 928-928-928 and tip body 1046 is threaded onto stud 762
each notch 932 mates with each corresponding catch-lip 926 such
that each protrusion 933 is positioned forward of the rearward
terminus of its corresponding catch-lip 926 thereby securing each
tip blade 356 to tip body 1046 as according to the securement means
of this invention. As is clearly illustrated in FIG. 90 a plane
1028 which is perpendicular to the central longitudinal axis of
cutting tip 260 intersects protrusion 933 of each tip blade at a
location closer to the central longitudinal axis of cutting tip 260
than the locations plane 1028 intersects each corresponding
catch-lip 926 of tip body 1046, as is according to the securement
means of this invention. Catch-lips 926-926-926 are examples of
holding elements as according to the securement means of this
invention.
[0199] FIG. 91 illustrates a tip blade 360 which is similar to tip
blade 356 except tip blade 360 has a sloped rear edge 934 which
will minimize any possible barbing effect that could occur when a
corresponding cutting tip is retracted from the substance it had
penetrated.
[0200] FIGS. 92 & 93 illustrate another example of securement
means as according to this invention where a cutting tip 264 is
shown to be removably attachable to a blade-opening arrowhead body.
Cutting tip 264 has three facets, three slots 928-928-928 each with
a catch-lip 926, three removably attachable tip blades 362-362-362,
and a tip body 1046 having an internally threaded female cavity 930
that threads onto a threaded male stud 782 of the arrowhead body.
Stud 782 has a depression 764 centrally axially formed at its
forward end, as is illustrated in FIG. 92. Each tip blade 362 has a
prong 940 and an arm 938. Prongs 940-940-940 are similar to
protrusion 933-933-933 except that each prong 940 extends in a
rearward direction when tip blades 362-362-362 are secured to
cutting tip 264, whereas each protrusion 933 extends in a forward
direction when tip blades 356-356-356 are secured to cutting tip
260. Therefore, when tip blades 362-362-362 are inserted into slots
928-928-928 and tip body 1046 is threaded onto stud 782 each prong
940 mates within depression 764 such that each prong 940 is
positioned rearward of the forward terminus of stud 782 thereby
securing each tip blade 362 to tip body 1046 as according to the
securement means of this invention. As is clearly illustrated in
FIG. 93 plane 1028 which is perpendicular to the central
longitudinal axis of cutting tip 264 intersects each prong 940 of
each tip blade at a location closer to the central longitudinal
axis of cutting tip 264 than the locations plane 1028 intersects
stud 782 of tip body 1046, as is according to the securement means
of this invention. It is apparent that tip blades 362-362-362 could
also each have a protrusion 933 and a notch 932 so as to mate with
catch-lips 926 to further aid in the securement of tip blades to
tip body 1046, as according to the desired results of this
invention.
[0201] FIGS. 94-96 illustrate another example of securement means
as according to this invention where a cutting tip 266 is shown to
be removably attachable to a blade-opening arrowhead body. Cutting
tip 266 has three facets, three slots 986-986-986 each with a
catch-lip 926, three removably attachable tip blades 364-364-364,
and a tip body 1048 having an internally threaded female cavity 944
that threads onto a threaded male stud 784 of the arrowhead body.
Internal cavity 944 has a larger diameter flange cavity 946
situated rearward of the threaded internal section as is
illustrated in FIG. 94. Each tip blade 364 has a flange 942 as is
illustrated in FIG. 96. Each flange 942 is substantially not
coplanar with at least another section of its corresponding tip
blade 364 as is clearly illustrated in FIG. 96. Therefore, when tip
blades 364-364-364 are inserted into slots 986-986-986 and tip body
1048 is threaded onto stud 784 each flange 942 mates within flange
cavity 946 such that each flange 942 is positioned
circumferentially or laterally away from the opening of its
corresponding slot 986 and against the inside wall of flange cavity
946 thereby securing each tip blade 364 to tip body 1048 as
according to the securement means of this invention. As is clearly
illustrated in FIG. 95 a plane 1028 which is perpendicular to the
central longitudinal axis of cutting tip 266 intersects each flange
942 of each tip blade at a location closer to the central
longitudinal axis of cutting tip 266 than the locations plane 1028
intersects tip body 1048, as is according to the securement means
of this invention.
[0202] As is illustrated in FIGS. 97a-c it is apparent that tip
blades having flanges 942 in combination with other tip blade
structures as disclosed herein will further aid in the securement
of the tips blades to corresponding tip bodies, as according to the
securement means of this invention.
[0203] FIGS. 98 & 99 illustrate another example of securement
means as according to this invention where a cutting tip 268 is
shown to be removably attachable to a blade-opening arrowhead body.
Cutting tip 268 has three facets, three slots 986-986-986 each with
a catch-lip 926, three removably attachable tip blades (of which
one is a tip blade 366 and another is a tip blade 368) as is
illustrated in FIG. 98, and a tip body 1048 having an internally
threaded female cavity that threads onto stud 784 of the arrowhead
body. For reasons of simplicity FIGS. 98 & 99 show only two tip
blades 366 and 368, but it is apparent that cutting tip 268
utilizes three tip blades. The arrowhead body has an annular recess
768 situated about stud 784. Tip blade 366 has a leg 952 and tip
blade 368 has a leg 954. Leg 954 of tip blade 368 is an extension
of flange 942. Therefore, when both blades 366 & 368 are
inserted into their slots 986-986 and tip body 1048 is threaded
onto stud 784 leg 954 of tip blade 368 and leg 952 of tip blade 366
mate within annular recess 768 such that each leg is positioned
rearward of the forward terminus of annular recess 768 thereby
securing each tip blade 366 & 368 to tip body 1048 as according
to the securement means of this invention. As is clearly
illustrated in FIG. 99 plane 1028 which is perpendicular to the
central longitudinal axis of cutting tip 268 intersects leg 954 of
tip blade 368 and leg 952 of tip blade 366 at locations closer to
the central longitudinal axis of cutting tip 268 than the locations
plane 1028 intersects the arrowhead body, as is according to the
securement means of this invention. As is obvious from FIG. 99 tip
blades 366 & 368 may also incorporate other structural tip
blade variations of the securement means according to this
invention as have been disclosed herein, in combination with legs
952 & 954 or their equivalents which mate in annular recesses
like annular recess 768.
[0204] FIGS. 100 & 101 illustrate yet another example of
securement means as according to this invention where a cutting tip
270 is shown to be removably attachable to a blade-opening
arrowhead body. Cutting tip 270 has three facets, three slots
960-960-960, three removably attachable tip blades 370-370-370, and
a tip body 1050. Tip body 1050 has an undercut cavity 958, a sloped
undercut wall 970, an externally threaded male stud 962 that
threads into a threaded female cavity 968 of the arrowhead body.
Sloped undercut wall 970 abuts against an annular shelf 966 of the
arrowhead body when tip body 1050 is attached thereto. The
arrowhead body has a larger diameter leg cavity 984 situated
forward of threaded internal cavity 968 as is illustrated in FIG.
100. Each tip blade 370 has an abutment edge 972 which abuts
against annular shelf 966 of the arrowhead body as is illustrated
in FIG. 101. Each tip blade 370 has a leg 956 so that when tip
blades 370-370-370 are inserted into slots 960-960-960 and tip body
1050 is threaded into cavity 968 each leg 956 mates within leg
cavity 984 such that at least a portion of each leg 956 is
positioned rearward of the forward terminus of the arrowhead body
and against the inside wall of leg cavity 984 thereby securing each
tip blade 370 to tip body 1050 as according to the securement means
of this invention. As is clearly illustrated in FIG. 101 plane 1028
which is perpendicular to the central longitudinal axis of cutting
tip 270 intersects each leg 956 of each tip blade 370 at a location
closer to the central longitudinal axis of cutting tip 270 than the
locations plane 1028 intersects the arrowhead body, as according to
the securement means of this invention.
[0205] FIG. 102 illustrates a tip blade 372 having a notch 927 and
a protrusion 935. Tip blade 372 shows that catch-lip, notch and
protrusion type securing features can be combined with legs 956 or
their equivalents of the tip blades of this invention similar to a
tip blade 370 so as to enhance the securement of the tip blades to
their tip bodies.
[0206] FIGS. 103-106 illustrate how an example of securement means
similar to the securement means embodiment as illustrated in FIGS.
100-101 as according to this invention is applicable to a
fixed-blade arrowhead. FIG. 105 shows that a cutting tip 271 is
removably attachable to a fixed-blade arrowhead body. Each forward
edge section 774 of the fixed cutting blades of the arrowhead abut
against corresponding abutment edges 972-972-972 of tip blades
372-372-372 when the arrowhead is assembled as is illustrated in
FIG. 104. Tip body 1051 differs from tip body 1050 of cutting tip
270 as illustrated in FIGS. 100 & 101 in that tip body 1051 has
a void 929 and a catch-lip 937 in each slot 966 thereof Each tip
blade 372 has a protrusion 935 and a notch 927. Therefore, when tip
blades 372-372-372 are inserted into slots 966-966-966 and tip body
1051 is threaded into the arrowhead body, each notch 927 mates with
each corresponding catch-lip 937 such that each protrusion 935 is
positioned forward of the rearward terminus of its corresponding
catch-lip 937 thereby securing each tip blade 372 to tip body 1051
as according to the securement means of this invention. As is
clearly illustrated in FIG. 104 plane 1028 which is perpendicular
to the central longitudinal axis of cutting tip 271 intersects
protrusion 935 of each tip blade at a location closer to the
central longitudinal axis of cutting tip 271 than the locations
plane 1028 intersects each corresponding catch-lip 937 of tip body
1051, as is according to the securement means of this
invention.
[0207] It is apparent that the securement means as according to
this invention may be used to secure tip blades or their
equivalents between facet junctures of cutting tips as according to
this invention.
[0208] FIG. 107 illustrates a forward end 772 of a fixed-blade
arrowhead blade 726. It is apparent that the forward end of the
fixed-blade arrowhead blades used in conjunction with cutting tips
of this invention having tip blades, may have different shapes such
as being substantially flat, so as to optimally fit with their
corresponding cutting tip.
[0209] FIGS. 108 & 109 illustrate a cutting tip 272 of a
fixed-blade arrowhead, which has fixed-blade arrowhead cutting
blades 728-728-728. Each cutting blade 728 has a substantially
straight cutting edge 982 at its forward end that abuts against an
abutment edge 976 of a tip blade 376 which is secured to a female
screw on type tip body 1052 as according to the securement means of
this invention. Cutting tip 272 as illustrated in FIG. 109 provides
razor sharp tip blades or cutting blades on a chisel type cutting
tip while also allowing to lock the upper section 982 of a fixed
cutting blade 728 to an arrowhead body by tucking the forward end
of the arrowhead blade in an undercut cavity of the chisel type
tip--as is a very common practice in the archery industry.
[0210] FIG. 111 shows a press-on fit tip 274 which has tip blades
378-378-378, an undercut wall 980 that abuts against an annular
shelf 780 of the arrowhead body, and an internal female cavity 978
which fits around a male stud 778 of the arrowhead body when tip
274 is pressed thereon.
[0211] It is apparent that there are many methods of attaching the
cutting tips as according to this invention to their respective
penetrating devices, including forming them integrally thereon.
[0212] FIGS. 112 & 113 illustrated a press-on fit cutting tip
276. Cutting tip 276 is similar to cutting tip 274 as illustrated
in FIG. 111 except cutting tip 276 has cutting edges 330-330-330
and accompanying bevels as according to this invention located at
the facet junctures in addition to having tip blades 378-378-378 on
the barrel section thereof.
[0213] It is apparent that the cutting tips as according to this
invention may have both true cutting edges or razor sharp cutting
edges as according to this invention at their facet junctures or
equivalents as well as on their barrel sections or equivalents,
which may comprise tip blades as have been disclosed herein. It is
apparent that any of the different facet juncture cutting edge
designs as illustrated or suggested herein may be combined with any
of the tip blade designs, including in manners that have not been
suggested herein.
[0214] It is apparent that different cutting tips as according to
the desired results of this invention exist which have not been
discussed above. It is apparent that the different parts and
structural shapes and their equivalents as according to the cutting
tips of this invention, as discussed above and as according to
other preferred embodiments of this invention, can be changed, or
interchanged, or eliminated, or duplicated, or made of different
materials, and connected to or associated with adjacent elements in
different manners, other than suggested herein, without deterring
from the desired results of the cutting tips as according to this
invention.
[0215] For example FIGS. 114 & 115 show a cutting tip 278 that
has both integral cutting edges 316-316-316 each formed by a pair
of bevels 516-516 at facet junctures, in conjunction with cutting
edges 376-376-376 of tip blades 378-378-378 on the barrel section
thereof.
[0216] Also FIGS. 116 & 117 illustrate a cutting tip 280 that
has both integral cutting edges 300-300-300 each formed by a
corresponding bevel 500 at facet junctures, and cutting edges
376-376-376 of tip blades 378-378-378 on the barrel section
thereof. It is apparent that cutting edges 376-376-376 could be
integrally formed with the barrel section of cutting tip 280 or
that they could be attachable whether removably so or not. It is
apparent that each cutting edge 376 may be an integrally ground
part of the barrel section of cutting tip 280.
[0217] FIGS. 118-131 illustrate cross-sectional views of cutting
tips 282-294 as according to this invention. Cutting tips 282-294
illustrate other possible structural arrangements of facet sections
and/or barrel sections that may be associated with or be part of
the cutting tips as according to this invention. It is apparent
that cutting edges of cutting tips 282-294 could be integrally
formed or ground thereon or that they could be attachable whether
removably so or not, despite how they are specifically illustrated
in FIGS. 118-131.
[0218] It is apparent that the number of cutting edges per
individual cutting tip i.e. attachable tip blades and/or integrally
formed cutting edges such as formed at facet junctures by one or
more bevels, may vary. The number of cutting edges is preferably
between 1 and 7 but may include more depending on the tip design
and intended use of the penetrating or cutting device. Although the
preferred embodiments of this invention have predominantly
illustrated a ratio of one cutting edge for each facet of a
corresponding cutting tip, it is apparent that cutting tips having
more than one cutting edge per facet is within the scope of this
invention, especially in cutting edge arrangements other than have
been disclosed herein.
[0219] It is to be understood that the present invention is not
limited to the sole embodiments described above, as will become
apparent to those skilled in the art, but encompasses the essence
of all embodiments, and their legal equivalents, within the scope
of the following claims.
* * * * *