U.S. patent number 3,819,170 [Application Number 05/299,926] was granted by the patent office on 1974-06-25 for portable sharpener.
Invention is credited to Howard Ray Longbrake.
United States Patent |
3,819,170 |
Longbrake |
June 25, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
PORTABLE SHARPENER
Abstract
A sharpener to be held in one hand of an operative and
comprising clamp members between which an article, arrowhead,
knife, etc., having a cutting edge to be sharpened or resharpened,
is secured and pivoted tool guide members extending transversely of
the clamp members and each having an aperture therein in which one
end of a sharpening instrument or tool, such as, a file, stone,
etc., is received while the other end is held by the other hand of
the operator and moved over the cutting edge to be sharpened or
resharpened.
Inventors: |
Longbrake; Howard Ray (Grafton,
OH) |
Family
ID: |
26802104 |
Appl.
No.: |
05/299,926 |
Filed: |
October 24, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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104940 |
Jan 8, 1971 |
3733933 |
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Current U.S.
Class: |
269/3; 76/88;
269/87.3; 451/175; 451/371 |
Current CPC
Class: |
B23D
67/12 (20130101) |
Current International
Class: |
B23D
67/00 (20060101); B23D 67/12 (20060101); B21k
005/12 () |
Field of
Search: |
;51/173,221R,221BS,218P
;29/76A ;76/82,82.2,88 ;269/1,2,3,6,87,87.1,87.2,87.3,321CF |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Lake; Roy
Assistant Examiner: Bicks; Mark S.
Attorney, Agent or Firm: Watts, Hoffman, Fisher & Heinke
Co.
Parent Case Text
RELATED APPLICATION
This application is a continuation-in-part of my copending U.S.
Pat. application, Ser. No. 104,940, filed Jan. 8, 1971, now U.S.
Pat. No. 3,733,933.
Claims
Having thus described my invention, what I claim is:
1. In a portable apparatus for use in the sharpening of a blade of
a hunting or like knife, arrow broadheads, etc., a holder to be
held in one hand by an operative and comprising a first clamp
member having a first planar surface with at least one linear edge
adapted for engaging one side of a blade having a cutting edge, a
plate-like member connected to said first clamp for pivotal
movement in a plane generally at right angles to said first surface
and parallel with said one linear edge and having at least one tool
receiving aperture therethrough spaced from its pivotal connection
with said first clamp member, a second clamp member having a second
planar surface opposed to said first surface of said first clamp
member adapted for engaging the other side of the blade, and means
for moving said clamp members toward one another to clamp the blade
therebetween.
2. In a portable apparatus for use in the sharpening of a blade of
a hunting or like knife, arrow broadheads, etc., a holder to be
held in one hand by an operative and comprising a first clamp
member having a first planar surface with at least one linear edge
adapted for engaging one side of a blade having a cutting edge, a
pair of plate-like members connected to said first clamp member for
pivotal movement in planes generally at right angles to said first
surface and parallel with said one linear edge about a common axis
and each having at least one tool receiving aperture therethrough
spaced from its pivotal connection with said first clamp member, a
second clamp member having a second planar surface opposed to said
first surface of said first clamp member adapted for engaging the
other side of the blade, and means for moving said clamp members
toward one another to clamp the blade therebetween.
3. In a portable apparatus for use in the sharpening of a blade of
a hunting or like knife, arrow broadheads, etc., a holder to be
held in one hand by an operative and comprising a first clamp
member having a first planar surface with at least one linear edge
adapted for engaging one side of a blade having a cutting edge, a
second clamp member having a second planar surface opposed to said
first surface of said first clamp member adapted for engaging the
other side of the blade, two plate-like members connected to said
first clamp member for pivotal movement in planes generally at
right angles to said first surface and parallel with said one
linear edge about a common axis offset from said first surface
towards said second surface a distance approximately equal to the
thickness of the blade and each having a tool receiving aperture
therethrough spaced equally from their pivotal connection with said
first clamp member, and means for moving said clamp members toward
one another to clamp the blade therebetween.
4. In a portable apparatus for use in the sharpening of a blade of
a hunting or like knife, arrow broadheads, etc., a holder to be
held in one hand by an operative and comprising a first clamp
member having a first planar surface with at least one linear edge
adapted for engaging one side of a blade having a cutting edge, a
second clamp member having a second planar surface with at least
one linear edge opposed to said first surface of said first clamp
member adapted for engaging the other side of the blade, a
plate-like member connected to said first clamp member for pivotal
movement in a plane at right angles to said first surface and
parallel with said linear edges and having at least one tool
receivng aperture therethrough spaced from its pivotal connection
with said first clamp member, shallow narrow grooves in said first
and second planar surfaces at said one edges thereof remote from
said plate-like member, said grooves opening into said one edges of
said clamp members and having planar surfaces facing one another,
and diverging from one another in the direction away from said
edges, and means for moving said clamp members toward one another
to clamp the blade therebetween.
5. In a portable apparatus for use in the sharpening of a blade of
a hunting or like knife, arrow broadheads, etc., a holder to be
held in one hand by an operative and comprising a first clamp
member having a first planar surface with at least one linear edge
adapted for engaging one side of a blade having a cutting edge, a
second clamp member having a second planar surface with at least
one linear edge opposed to said first surface of said first clamp
member adapted for engaging the other side of the blade, two
plate-like members connected to said first clamp member for pivotal
movement in planes at right angles to said first surface and
parallel with said linear edges about a common axis and each having
at least one tool receiving aperture therethrough spaced equally
from their pivotal connection with said first clamp member, shallow
narrow grooves in said first and second planar surfaces at said one
edges thereof remote from said plate-like members, said grooves
opening into said one edges of said clamp members and having planar
surfaces facing one another and diverging from one another in the
direction away from said edges, and means for moving said clamp
members toward one another to clamp the blade therebetween.
Description
FIELD OF INVENTION
The present invention relates to portable sharpeners.
PRIOR ART
Typically, blades of jack knives, hunting knives, arrow broadheads,
and the like, are sharpened or resharpened in the field by being
held in one hand while a sharpening tool, such as, a stone or file,
held in the other hand is moved over the cutting edge. Because of
the difficulty of maintaining the proper relationship between the
blade being sharpened and the tool the results are usually not
entirely satisfactory and often very unsatisfactory.
SUMMARY OF INVENTION
The present invention provides a novel portable sharpener simple in
construction, inexpensive to manufacture and comprising a member
having a clamp element associated therewith for detachably securing
thereto a blade of an article, a cutting edge of which is to be
sharpened and a guide for a cooperating sharpening tool. The
sharpener can be conveniently held in one hand while the sharpening
instrument or tool held in the other hand is moved over the cutting
edge to be sharpened or resharpened with minimum risk to the
operator. The sharpening tool is positioned with respect to the
cutting edge being sharpened by the guide of the sharpener.
The invention further provides a novel portable sharpener for
knives, arrow broadheads and the like which can be readily
disassembled and is otherwise so constructed that it can be
conveniently carried by a person for field use.
Further objects and advantages of the invention will be apparent
from the following description of two preferred embodiments thereof
described with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of one embodiment of the present
invention illustrating its use in the sharpening of a double-blade
steel arrow broadhead;
FIG. 2 is a plan view of the sharpener shown in FIG. 1;
FIG. 3 is an elevational view of the sharpener shown in FIG. 2
looking from the right;
FIG. 4 is an elevational view of the sharpener shown in FIG. 3,
looking from the left;
FIG. 5 is an elevational view of the sharpening tool or
instrumentality shown in FIG. 1;
FIG. 6 is a perspective view of a different embodiment of the
invention illustrating how the sharpener may be used for the
sharpening of the cutting edge of a hunting knife;
FIG. 7 is an elevational view, similar to FIG. 3, but of the
sharpener shown in FIG. 6; and
FIG. 8 is a side elevational view of the sharpening tool or
instrumentality shown in FIG. 6.
DESCRIPTION OF PREFERRED EMBODIMENT
The sharpener shown in FIGS. 1 to 5 of the drawings comprises a
holder or clamp assembly, designated generally by the reference
character A, adapted to be held in one hand by an operative in the
manner illustrated in FIG. 1, while a sharpening tool or
instrumentality, designated generally by the reference character B,
adapted to be held in the other hand is moved over the cutting edge
of a blade to be sharpened which in the illustration, FIG. 1, is a
blade of a double-bladed steel arrow broadhead C of an arrow D. The
path of the tool relative to the cutting edge being sharpened is in
part determined by a guide member of the sharpener for the far end
of the tool B, as viewed in FIG. 1.
The blade holder A, comprises a plate-like base member 10 having a
planar near side 12, a portion of which adjacent to one edge
constitutes the fixed jaw of the clamp assembly. A second
plate-like member 20 movably connected to the member 10, as by the
screw 22 threaded into a tapped aperture in the member 10, acts as
a clamp member and has a planar surface 24 a portion of which
adjacent one edge forms the movable jaw of the clamp assembly or
blade holder. While the members 10, 20 are shown as rectangularly
shaped plate-like members they may have any shape suitable for
clamping a blade of an article to be sharpened and to be held in
one hand of an operative. The member 10 is provided with a flange
34 along one side which provides a ledge or abutment surface 36 for
one edge of the member 20 to limit rotation of the member 20 about
the screw 22. Any suitable alternative construction may be
employed, such as, a pin offset from the screw 22 and fixed to one
of the members 10, 20 and projecting into an aperture in the other
member.
In addition to the parts previously referred to, the sharpener or
holder A includes two members 40, 42 pivotally connected to the far
end of the member 10, as viewed in FIGS. 1, 2 and 4, by a screw 44
threaded into a suitable tapped aperture in the member 10 for
movement in planes at right angles to the plane of the planar clamp
surface of the member 10. The members 40, 42 are provided with tool
guiding apertures 46, 48, respectively, in their free ends for the
reception of a cylindrical end portion 50 of the tool B. When the
holder is in use the members 40, 42 are rotated to a position
extending transversely of the members 10, 20, that is, to the
approximate position shown in FIGS. 1, 3 and 4. The width of the
members 40, 42 is preferably about that of the thickness of the end
of the member 10 to which they are attached and when the sharpener
is not in use the members 40, 42 may be folded or pivoted into
alignment with the member 10.
The tool B comprises a three-cornered file 52 having an internally
threaded ferrule 54 fixedly secured to the one end thereof and into
which a threaded extension 56 on the one end of the cylindrical
member 50, previously referred to, is adapted to be screwed for
detachably connecting the members 50, 52. The end of the file 52
opposite the cylinder extension 50 has a conventional hand grasp 60
fixedly secured thereto. The free end of the hand grasp 60 is
preferably provided with a screwdriver-like blade 62 which can be
conveniently used for rotating the screw 22 in the arrowhead
holder.
When a cutting edge of a knife or like blade is to be sharpened the
blade is positioned and clamped between the clamp surfaces 12, 24
of the members 10, 20. In the case of an arrow broadhead, one of
the blades thereof other than the blade the edge of which is to be
sharpened is clamped between the members 10, 20, with the shaft of
the arrow extending towards the right, as viewed in FIG. 1, and the
point of the broadhead, preferably at or adjacent to one side edge
of the holder. The members 40, 42 are rotated to locate the guide
holes 46, 48 therein predetermined from the planes of the clamp
surfaces 12, 24 of the clamp members. After the article or blade of
which is to be sharpened is properly and securely clamped between
the members 10, 20 and with the members 40, 42 in the desired
position, the cylindrical extension 50 of the tool B is inserted in
one of the guide apertures 46, 48 and the working surface of the
tool is moved over the cutting edge to be sharpened. The
non-adjacent sides of the members 10, 20, may be beveled as at 64,
66, along the edges 67, 68, respectively, to assure adequate
clearance for the sharpening tool.
The member 20 is provided with a clamp member spacing projection 70
on the side thereof adjacent to the member 10 and at a location
spaced from the screw 22 towards the abutment surface 36. The
height of the projection 70 is approximately the thickness of a
knife or arrow blade. The thickness of an arrow blade is typically
about 0.044 inches and that of a knife blade slightly more. The
height of the projection 70 is preferably such that when a blade is
clamped between the surfaces 12, 24, they are parallel or
essentially parallel with one another. If the members 40, 42 are
positioned so that the tool guiding holes therein are symmetrical
with respect to a right trihedron, that is, three planes at right
angles to one another, one of which is parallel to the surface 12
of the member 10 but offset toward the member 20 half the thickness
of the clamped blade and another in the plane of the adjoining
sides of the members 40, 42, duplicate bevels can be readily
obtained at opposite sides of the cutting edge being sharpened. The
third plane of the right trihedron may be the plane of one of the
sides 72, 74 of the member 10 or a plane parallel therewith.
It will be obvious that the projection 70 for spacing the clamp
members may be on either member 10, 20 and that one of the members
40, 42 could be omitted and as opposite sides of the cutting edge
are sharpened the retained member could be pivoted so as to project
first to one side of the clamp members and then to the other. In
practice, however, it has been found more convenient to have both
members available as it is customary to repeatedly shift the
sharpening tool back and forth from one side of a blade to the
other side during sharpening. If desired, the article to be
sharpened can be clamped at either of the sides 72, 74 of the
holder rather than at the side shown. When not in use the members
40, 42 can be pivoted to positions in alignment with the clamp
member 10, and the sharpening tool B disassembled. In this
condition the sharpener can be conveniently carried in a jacket
pocket.
The sharpener A' shown in FIGS. 6 and 7 is similar to the sharpener
A shown in FIGS. 1 to 4 and the corresponding parts are designated
by the same reference characters as those employed in FIGS. 1 to 4
with a prime mark affixed thereto. The base and clamp members 10',
20' of the sharpener shown in FIGS. 6 and 7 are similar to the base
and clamp members 10, 20 shown in FIGS. 1 to 4 except that their
sides or edges 67', 68' farthest from the members 40', 42' have
recesses or apertures 80, 82 therein, respectively, facing one
another and extending their entire lengths. The opposed sides of
the recesses 80, 82 are inclined, diverging from one another with
respect to the surfaces 12', 24' in the direction away from the
edges 67', 68', at an angle which corresponds to about one-half of
the included angle of a blade of a knife, such as, the blade 84 of
the knife F shown, which included angle is typically about
3.degree.. In other words, the surfaces of the recesses 80, 82
facing one another are inclined rearwardly of the edges 67', 68'
approximately one and one-half degree to the plane of the surfaces
12', 24', respectively. The recesses or grooves 80, 82 are
relatively narrow in the direction normal to the length of the
edges 67', 68' of the members 10', 20' so that the holder can
readily be employed to hold between the surfaces 12', 24' a blade
which does not have a taper, such as, a blade of an arrow, as
illustrated in FIG. 1. The recesses, however, are of sufficient
width to securely hold a knife blade. The inclination of the
surfaces of the recesses 80, 82 assures that the midplane of a
knife blade clamped therebetween is parallel with or essentially
parallel with the surfaces 12', 24'. If desired, more than one tool
receiving guide aperture 46' and/or 48' can be provided in the
members 40', 42', respectively, as illustrated in FIGS. 6 and
7.
The manner of movably connecting the clamp member 20' to the base
member 10' employed in the sharpener A' is different from that
employed in connecting the clamp member 20 to the base member 10 of
the sharpener A. The difference, however, is not material to the
present invention and the construction employed in sharpener A
could be employed in sharpener A'. In like manner, the construction
employed in sharpener A' could be substituted for that employed in
sharpener A. In sharpener A' a screw 90, which is of the thumb
screw-type with a knurled head 92, is threaded into a tapped
aperture 94 in the clamp member 20' between the screw 22' and the
edge or end of the clamp member 20' opposite the end or edge 68
thereof. The end of the screw 90 opposite the head 92 engages
against the surface 12' of the base member 10' and is effective to
pivot the clamp member 20' about the screw 22'. It is noted that
there is no projection on the member 10' similar to the projection
70 of sharpener A. The use of the clamp screw 90 provides an
improved clamping action over the construction employed in
sharpener A since the clamp screw 90 produces a greater mechanical
advantage than the screw 22.
The sharpening tool F shown in FIGS. 6 and 8 comprises an elongated
rectangular support or base member 100 and a tool guide rod 102.
Different sharpening instrumentalities such as the honing stone
assembly 104, illustrated, comprising a stone proper 106 connected
to a carrier member 108, can be detachably connected by means of
nuts 110, 112 threaded on screws 114, 116 having their heads
embedded in the member 108 and their threaded shanks extending
through suitable apertures in the support member 100. Any suitable
sharpening instrumentality may be substituted for the honing stone
assembly shown.
One end of the support member 100 of the sharpening tool F extends
beyond the honing stone assembly 104 and has an aperture 120
therethrough in which a short section 122 of the guide rod 102 is
movably positioned. The elongated section 124 of the guide rod 102
which is at right angles to the short section 122 is adapted to be
received in one of the apertures 46', 48' to guide or assist in
guiding the tool during the sharpening operation.
The section 122 of the rod 102 is releasably secured in the member
100 by a thumb screw 130, threaded into a tapped aperture 132 in
the end of the member 100 adjacent to the aperture 120. The
aperture 132 opens into the aperture 120 and the construction is
such that the screw 130 can be loosened and the guide rod 102
rotated in the aperture 120 so that the section 124 extends at one
side of the support member 100 to facilitate the sharpener being
carried in a coat or like pocket when not in use.
From the foregoing description of the preferred embodiments of the
invention shown in the drawings, it will be apparent that the
objects of the invention heretofore enumerated and others have been
accomplished and that there has been provided a novel and improved
sharpener for small portable articles such as knives, arrows and
the like, which can be conveniently carried by sportsmen, etc., and
used in the field to produce any desired bevel on the cutting edge
of an arrow, knife or like blade.
While preferred embodiments of the invention have been shown and
described in considerable detail, it is to be understood that the
invention is not limited to the particular constructions shown, and
that it is the intention to hereby cover all adaptations,
modifications and uses thereof which come within the practice of
those skilled in the art to which the invention relates and the
spirit and the scope of the appended claims.
* * * * *