U.S. patent number RE45,341 [Application Number 13/530,837] was granted by the patent office on 2015-01-20 for replaceable demolition shear piercing tip.
This patent grant is currently assigned to Genesis Attachments, LLC. The grantee listed for this patent is Bruce Bacon, Ross D. Christenson, Daniel P. Jacobson. Invention is credited to Bruce Bacon, Ross D. Christenson, Daniel P. Jacobson.
United States Patent |
RE45,341 |
Jacobson , et al. |
January 20, 2015 |
**Please see images for:
( Reexamination Certificate ) ** |
Replaceable demolition shear piercing tip
Abstract
A heavy-duty demolition shear with a replaceable shearing tip
has a lower jaw and an upper jaw piviotally connected to the lower
jaw. The upper jaw has primary and secondary shear blades. A
replaceable shearing tip is mounted to the upper jaw. The
replaceable shearing tip has two L-shaped sections which engage the
upper jaw between them. The replaceable shearing tip engages the
upper jaw on at least three seats. The replaceable shearing tip is
connected to the upper jaw by socket-head cap-screws.
Inventors: |
Jacobson; Daniel P. (Wrenshall,
MN), Bacon; Bruce (Duluth, MN), Christenson; Ross D.
(Esko, MN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Jacobson; Daniel P.
Bacon; Bruce
Christenson; Ross D. |
Wrenshall
Duluth
Esko |
MN
MN
MN |
US
US
US |
|
|
Assignee: |
Genesis Attachments, LLC
(Superior, WI)
|
Family
ID: |
32297723 |
Appl.
No.: |
13/530,837 |
Filed: |
June 22, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
10299543 |
Nov 18, 2002 |
6839969 |
|
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Reissue of: |
11032838 |
Jan 10, 2005 |
7895755 |
Mar 1, 2011 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E04G
23/082 (20130101); E02F 3/965 (20130101); B23D
35/002 (20130101); B23D 17/00 (20130101); B23D
35/001 (20130101) |
Current International
Class: |
B02C
1/06 (20060101) |
Field of
Search: |
;30/134,194,228,223,349
;144/34.5 ;241/101.73 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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29708705 |
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Jul 1997 |
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DE |
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29715490-US |
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Dec 1997 |
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DE |
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0666131 |
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Jan 1995 |
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EP |
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0768137 |
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Apr 1997 |
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EP |
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2822482 |
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Sep 2002 |
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FR |
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01010827 |
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Jan 1989 |
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JP |
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09195528 |
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Jul 1997 |
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JP |
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2001028687 |
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Apr 2001 |
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WO |
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WO-01/68992 |
|
Sep 2001 |
|
WO |
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WO-2004/013417 |
|
Feb 2004 |
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WO |
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Primary Examiner: Nguyen; Phong
Attorney, Agent or Firm: Oppold; Thomas J. Larkin Hoffman
Daly & Lindgren Ltd.
Parent Case Text
This is a continuation of application Ser. No. 10/299,543, filed
Nov. 18, 2002 now U.S. Pat. No. 6,839,696.
Claims
What is claimed:
.[.1. A heavy-duty demolition shear with a replaceable shearing
tip, the apparatus having a lower jaw and an upper jaw pivotally
connected to the lower jaw, the upper jaw having a shearing blade,
comprising: (a) a tip mounting portion on the upper jaw, the
shearing blade having a cutting edge on a lower, planar shearing
surface and a tip mounting surface, the tip mounting surface
meeting the cutting edge an acute angle to the cutting edge; (b) a
replaceable shearing tip mountable to the tip mounting portion,
wherein the replaceable shearing tip further comprises two sections
encompassing the tip mounting portion there-between, wherein the
two sections are L-shaped and having a first arm and a second arm,
the first arm and the second arm each comprising a continuous
planar surface; (c) wherein the first arm of the L meets the
cutting edge of the shearing blade at an oblique angle; wherein the
upper jaw further comprises at least three seats for engaging the
replaceable shearing tip, wherein one of the at least three seats
is the tip mounting surface of the shear blade, and wherein the
replaceable shearing tip abuts firmly against the tip mounting
surface without a gap; and (d) wherein the continuous planar
surface of the second arm of the L forms a dihedral angle with the
plane of the shearing surface of the shearing blade..].
.[.2. A heavy-duty demolition shear with a replaceable shearing
tip, the apparatus having a lower jaw and an upper jaw pivotally
connected to the lower jaw by a pivot means, the upper jaw having a
shearing blade, the shearing blade having a cutting edge and a
shearing surface, comprising: (a) a replaceable shearing tip; (b) a
replaceable shearing tip mounting portion on the upper jaw, wherein
the replaceable shearing tip further comprises two sections
encompassing the replaceable shearing tip mounting portion
there-between, wherein the two sections are L-shaped; (c) the
shearing blade having a replaceable shearing tip mounting surface,
the replaceable shearing tip mounting surface meeting the cutting
edge at an acute angle to the cutting edge; (d) wherein the
replaceable shearing tip abuts firmly against the replaceable
shearing tip mounting surface without a gap; (e) the replaceable
shearing tip meets the cutting edge of the shearing blade at an
oblique angle; and (f) wherein each of the L-shaped sections
further comprises a first arm and a second arm, each of the first
arm and the second arm comprising a continuous planar surface, the
first arm abutting against the replaceable shearing tip mounting
surface of the shearing blade without a gap, the shearing surface
of the shearing blade forming a single continuous plane parallel to
the axis of the pivot means, the single continuous planar surface
of the second arm meeting the single continuous plane of the
shearing surface of the shearing blade at a dihedral angle..].
.[.3. A heavy-duty demolition shear with a replaceable shearing
tip, the apparatus having a lower jaw and an upper jaw pivotally
connected to the lower jaw, the upper jaw having a shearing blade,
the shearing blade having a first side, a second side, and a lower,
planar shearing surface between the first side and the second side
of the heavy duty demolition shear comprising: (a) a tip mounting
portion on the upper jaw, the shearing blade having a cutting edge
and a tip mounting surface, the tip mounting surface meeting the
cutting edge at an acute angle to the cutting edge; (b) a
replaceable shearing tip mountable to the tip mounting portion,
wherein the replaceable shearing tip further comprises two sections
encompassing the tip mounting portion there-between, wherein the
two sections are L-shaped and having a first arm and a second arm;
(c) wherein the first arm of the L-shape meets the cutting edge of
the shearing blade at an oblique angle; wherein the upper jaw
further comprises at least three seats for engaging the replaceable
shearing tip, wherein one of the at least three seats is the tip
mounting surface of the shear blade, and wherein the replaceable
shearing tip abuts firmly against the tip mounting surface without
a gap; and (d) wherein the second arm of the L forms a single
continuous plane, said single continuous plane forming a dihedral
angle with the lower, planar shearing surface..].
.[.4. The heavy-duty demolition shear of claim 3, wherein the acute
angle and oblique angle are supplementary..].
.[.5. A heavy-duty demolition shear with a replaceable shearing
tip, the apparatus having a lower jaw and an upper jaw pivotally
connected to the lower jaw, the upper jaw having a shearing blade,
the shearing blade having a cutting edge on a lower, planar
shearing surface, comprising: (a) a replaceable shearing tip; (b) a
replaceable shearing tip mounting portion on the upper jaw, wherein
the replaceable shearing tip further comprises two sections
encompassing the replaceable shearing tip mounting portion
there-between, wherein the two sections are L-shaped; (c) the
shearing blade having a replaceable shearing tip mounting surface,
the replaceable shearing tip mounting surface meeting the cutting
edge at an acute angle to the cutting edge; (d) wherein the
replaceable shearing tip abuts firmly against the replaceable
shearing tip mounting surface without a gap; (e) the replaceable
shearing tip meets the cutting edge of the shearing blade at an
oblique angle; and (f) wherein each of the L-shaped sections
further comprises a first arm and a second arm, the first arm
abutting against the replaceable shearing tip mounting surface of
the shearing blade without a gap, the second arm of the L lying in
a single continuous plane, the plane of the second arm meeting the
plane of the shearing surface at a dihedral angle..].
.[.6. The heavy demolition shear of claim 5, wherein the acute
angle and the oblique angle are supplementary..].
.Iadd.7. A tip adapted to mount to a nose of an upper jaw of a
demolition shear, the nose having a first laterally recessed
mounting surface on a first side defining a first nose ledge
surface and a second laterally recessed mounting surface on a
second side defining a second nose ledge surface, wherein a lateral
distance between the first and second lateral recessed mounting
surfaces define a nose tip width, the nose tip width having a
bottom end, the upper jaw of the demolition shear further having a
shear blade, the shear blade having a forward edge, the tip
comprising: (a) a first tip body having an inside face, an outside
face, a top edge, a rear edge and a bottom flange extending
laterally inward from said inside face such that said first tip
body defines an L-shape in cross-section, said bottom flange having
a continuous planar bottom surface; wherein, when said first tip
body is mounted to the nose of the upper jaw of the demolition
shear, (i) said bottom flange extends at least partially across the
bottom end of the nose tip width from the first side; (ii) said
inside face of said first tip body is disposed adjacent the first
laterally recessed mounting surface; (iii) said top edge of said
first tip body engages the first nose ledge; and (iv) a portion of
said rear edge engages the forward edge of the shear blade at an
oblique angle; (b) a second tip body having an inside face, an
outside face, a top edge, a rear edge and a bottom flange extending
laterally inward from said inside face such that said second tip
body defines an L-shape in cross-section, said bottom flange having
a continuous planar bottom surface; wherein, when said second tip
body is mounted to the nose of the upper jaw of the demolition
shear, (i) said bottom flange extends at least partially across the
bottom end of the nose tip width from the second side; (ii) said
inside face of said second tip body is disposed adjacent the second
laterally recessed mounting surface; and (iii) said top edge of
said second tip body engages the second nose ledge. .Iaddend.
.Iadd.8. The tip of claim 7, whereby; when said first tip body is
mounted to the first side of the nose, said continuous planar
bottom surface of said bottom flange of said first tip body is at
an angle .alpha.1 between a range of about -10 degrees to about +35
degrees from a lower edge of the shear blade. .Iaddend.
.Iadd.9. The tip of claim 7, whereby; when said first tip body is
mounted to the first side of the nose, the top edge of said first
tip body is at an angle .alpha.2 between a range of about -20
degrees to about +25 degrees from a top edge of the shear blade.
.Iaddend.
.Iadd.10. The tip of claim 7, whereby; when said first tip body is
mounted to the first side of the nose, a front surface of said
first tip body is at an angle .alpha.3 between a range of about 55
degrees to about 75 degrees from a lower edge of the shear blade.
.Iaddend.
.Iadd.11. The tip of claim 7 wherein; said continuous planar bottom
surface of said bottom flange of said first tip body is at an angle
.alpha.4 between a range of about -15 degrees to about +15 degrees
from a top side of said bottom flange of said first tip body; and
said continuous planar bottom surface of said bottom flange of said
second tip body is at an angle .alpha.4 between a range of about
-15 degrees to about +15 degrees from a top side of said bottom
flange of said second tip body. .Iaddend.
Description
BACKGROUND OF THE INVENTION
A fuller understanding of the operation of the demolition apparatus
of the present invention may be achieved by studying U.S. Pat. No.
4,519,135, hereby incorporated by reference. This invention relates
to a heavy duty demolition apparatus, especially adapted to be
mounted on a rigid boom of a mobile vehicle and particularly
adapted to be mounted on the dipper stick of an excavator.
The invention also has a replaceable shearing tip on the movable
upper jaw.
Heavy duty shears of the type that are powered by hydraulic
cylinders are proving more and more useful in handling scrap and
especially metal scrap of all sorts. Such scrap comes in many
different forms, and may be in the form of pipes made of steel or
soft iron or cast iron, ranging in sizes from 2 inches or smaller,
and up to 8 or 10 inches in diameter or larger; structural beams
such as I-beams, channels, angle beams in a large range of sizes,
up to 8 or 10 inches across and larger; rods and heavy cables
having diameters of 2 to 3 inches and larger, metal sheets and
plates and formed metal of all sorts including wheels and
automobile and truck frames, and a myriad of long and short pieces
of stock and metal pieces that are cast, rolled, stamped or
otherwise formed, both singly and in various types of assembly.
The prior art has included numerous shears such as that illustrated
in U.S. Pat. No. 4,198,747; U.S. Pat. No. 4,188,721; U.S. Pat. No.
4,897,921; U.S. Pat. No. 4,543,719; U.S. Pat. No. 4,558,515 and
U.S. Pat. No. 4,104,792. Typically, these heavy duty shears mount
on the dipper stick of an excavator so that the shears may be
controlled fairly well in handling various types of scrap and
cutting the scrap into smaller twisted and contorted pieces and
lengths as the scrap is drawn into the throat of the shear.
Typically, these shears have a fixed lower jaw and a movable upper
jaw that pivots on the lower jaw, with shear blades of hardened
steel on both the upper jaw and the lower jaw. The workpiece is
sheared by closing the upper jaw against the lower jaw under
hydraulic pressure, with the shear blades cutting the workpiece.
The movable upper jaw may also have a fixed, hardened shearing tip
integral with the upper jaw. The tip is not suitable for removal
and replacement due to the high lateral forces exerted on the tip
as the movable jaw flexes laterally. Great tension is also exerted
upon the tip, which may be wedged tight with scrap, upon opening
the jaws. Direct shear bearing loads are also on the tip when
shearing. All these factors will cause a removable tip to readily
break off the upper jaw.
There is a need for a heavy duty demolition shear with a
replaceable shearing tip
SUMMARY OF THE INVENTION
A heavy-duty demolition shear with a replaceable shearing tip has a
lower jaw and an upper jaw piviotally connected to the lower jaw.
The upper jaw has primary and secondary shear blades. A replaceable
shearing tip is mounted to the upper jaw. The replaceable shearing
tip has two L-shaped sections which engage the upper jaw between
them. The replaceable shearing tip engages the upper jaw on at
least three seats. The replaceable shearing tip is connected to the
upper jaw by socket-head cap-screws.
A principal object and advantage is that the upper jaw has a
replaceable shearing tip.
Another object and advantage is that the replaceable tip is held in
place by socket-headed cap-screws which will hold the tip in place
despite high direct and lateral/forces, as well as stress shearing
forces and tensional forces exerted on the tip when opening the
shear with jammed scrap pieces about the tip.
Another object and advantage is that the tip is supported on the
upper jaw on at least three seating surfaces, which alleviates
stress shearing forces and tensional forces.
Another object and advantage of the present invention is that the
tip encapsulates the upper jaw and prevents the upper jaw from
being damaged by forces exerted on the tip.
Other advantages will be understood from reading the Detailed
Description of Preferred Embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a right-side perspective view of the demolition apparatus
with the replaceable shearing tip of the present invention, showing
the tip assembled on the apparatus.
FIG. 2 is like FIG. 1, but with the tip exploded off the apparatus
(disassembled).
FIG. 3 is similar to FIG. 2, but is a left-side perspective
view.
FIG. 4 is similar to FIG. 1, but is a left-side perspective
view.
FIG. 5 is a partial right-side elevational view of the upper jaw of
the apparatus with the tip mounted thereon, showing various
angles.
FIG. 6 is a cross-section at approximately the lines 6 of FIG.
5.
FIG. 7a is similar to FIG. 5, showing additional angles. FIG. 7b is
a cross-sectional view taken at approximately the lines 7b in FIG.
7a.
FIG. 8 is similar to FIG. 6, showing additional dimensions.
FIG. 9 is similar to FIG. 5, showing additional angles.
FIG. 10 is similar to FIG. 5, showing additional angles.
FIG. 11 is similar to FIG. 5, showing additional angles.
FIG. 12 is similar to FIG. 5, showing additional angles.
FIG. 13 is a right-side elevational view of the apparatus of the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The heavy-duty demolition apparatus of the present invention is
generally referred to in the Figures as reference numeral 10.
Referring to FIGS. 1 through 6, the heavy-duty demolition apparatus
10 comprises a lower jaw 12, an upper jaw 14, and pivot means 16
interconnecting the lower jaw 12 and upper jaw 14.
The upper jaw 14 has a first side 22, and a second side 24. The
lower jaw 12 has a first mounting plate 26 adjacent the first side
22, and a second mounting plate 28 adjacent the second side 24. The
first mounting plate 26 and second mounting plate 28 receive the
pivot means 16 between them.
The upper jaw 14 has upper shear blades 33 and 34 meeting at apex
35 and the lower jaw 12 has lower shear blades 36 and 37 extending
along each other for shearing a workpiece when the upper shear
blades 33 and 34 are closed upon the lower shear blades 36 and 37.
Preferably, the shear blades 33, 34, 36 and 37 are replaceable.
Preferably, the apparatus 10 further comprises a guide blade 48 on
the lower jaw 12 lying .[.along.]. .Iadd.opposite .Iaddend.the
lower shear blade 36 and in spaced relation therewith, the outer
end 50 of the guide blade and outer end 52 of the shear blade being
.[.adjacent each other, and rigid means 54 securing the outer ends
50, 52.]. .Iadd.secured .Iaddend.together .Iadd.by rigid means
54.Iaddend.. The rigid means 54 is preferably a tie plate 56.
An open slot 58 .Iadd.having a width wider than the upper jaw 14
.Iaddend.preferably exists between the lower shear blade .[.36.].
.Iadd.37 .Iaddend.and the adjacent guide blade 48 to receive the
upper .[.shear blade 34.]. .Iadd.jaw .Iaddend.therein.[., the open
slot 58 having a width wider than the thickness of the upper shear
blade 34 to maintain open space between the upper shear blade 34
and the guide blade 48 when the upper shear blade 34 is in the open
slot 58.]..
On the first shearing side 22, the upper jaw will receive the upper
primary shear blade .[.31.]. .Iadd.33 .Iaddend.and the upper
secondary shear blade .[.33.]. .Iadd.34.Iaddend.. The shear blades
.[.31.]. .Iadd.33 .Iaddend.and .[.33.]. .Iadd.34 .Iaddend.meet at
the upper shear blade apex 35 which is the last point wherein the
upper jaw 14 shears a workpiece against lower elongate shear blade
36. On the lower jaw 12, the lower primary shear blade 36 and lower
secondary shear blade 37 are received.
To accommodate secure attachment of the replaceable shearing tip
110, the upper, movable jaw 14 is modified to include a tip
mounting portion 60, as seen in FIGS. 1-4.
The tip mounting portion 60 further comprises a first mounting
surface 60a on the first side 22 of the upper jaw 14, and a second
mounting surface 60b on the second side 24. A third mounting
surface 60c is located on the bottom side of the upper jaw 14
between the first mounting surface 60a and the second mounting
surface 60b. A fourth mounting surface 60d is located above each of
the first 60a and second 60b mounting surfaces on the upper jaw 14.
Between the first mounting surface 60a and the second mounting
surface 60b is narrowed upper jaw tip portion 70.
The replaceable shearing tip 110 comprises a first half 110a and a
second half 110b. The first half 110a mounts to the first mounting
surface 60a, while the second half 110b mounts to the second
mounting surface 60b. Each of the first half 110a and second half
110b has a ledge or flange 110c that engages the third mounting
surface 60c. In overall configuration, it will be seen that each of
the first half 110a and second half 110b is "L"-shaped in
cross-section. In addition, each of the first half 110a and second
half 110b has a top edge 110d that engages the fourth mounting
surface 60d. The first half 110a and second half 110b each have a
rear surface 110e that engages the upper secondary shear blade 34
at forward edge 34a. The first half 110a and second half 110b each
have a bottom edge 110f.
As best seen in FIG. 6, the replaceable shearing tip 110 is
preferably mounted to the tip mounting portion 60 by socket head or
spline-head cap-screws 120. Holes 122 are drilled through the first
half 110a and the second half 110b to receive the cap-screws 120.
The second half 110b is preferably tapped with internal threads
that engage external threads on the cap-screw 120. The first half
110a is preferably counter-bored with counter-bores 124 to receive
the head 120a of the cap-screw 120. As can be seen, most preferably
the thickness of the first half 110a that has the counter-bore 124
is equal to or greater than the thickness of the second half 110b.
Also, the thickness of the narrowed upper jaw tip portion 70 is
equal to or greater than thickness of either the first half 110a or
the second half 110b. Further, as seen best in FIG. 8, the
thickness of d1 the material of the first half 110a beneath and
supporting the cap-screw head 120a is less than the depth d2 of the
cap-screw head counter-bore 124. These structural features provide
structural strength to the components.
For stress relief, it is highly preferred that the top edge 110d is
radiused where it meets the third mounting surface 60c, which is
similarly radiused. Also, the bottom ledge or flange 110c is
partially radiused where it meets the third mounting surface 60c.
See FIG. 6.
As a result of the above structure, as seen in FIGS. 7a and 7b, the
replaceable shearing tip 110 will seat against the upper movable
jaw 14 on at least three separate surfaces or seats: surfaces 60c,
60d, and 34a. This is in addition to the mounting surfaces 60a and
60b on the narrowed upper jaw tip portion 70. This feature greatly
relieves stress on the tip 110 and serves to hold the tip 110
firmly in place on the upper jaw 14 as the tip 110 pierces and is
later withdrawn from the workpiece.
In addition, the structure of the replaceable shearing tip 110
encapsulates the narrowed upper jaw tip portion 70 and protects it.
The tip 110 is more durable than previous replaceable tips and the
fastening systems used therewith. Because the tip 110 is
constructed of paired halves 110a, 110b, in the event that one of
the halves is damaged, it is only necessary to replace that half
and not the whole tip.
The socket-headed or spline-headed cap-screws 120 allow the tip 110
to be attached to the upper jaw 14 without bolts, improving
strength and allowing more material to be used in the upper jaw.
Further, an Allen wrench can be used to drive the socket-headed
cap-screws 120 into the bores 124, instead of using a box-end
wrench of socket wrench on the outside of the screw heads 120a.
This requires less material to be removed from the upper jaw
14.
Applicant has found that, for optimum performance and reliability
of the replaceable shearing tip 110, a number of important angular
relationships between the parts thereof and the upper jaw 14 are
highly desirable.
First, as best seen in FIGS. 5 and 10, an angle .alpha.1 between
the bottom edge 110f of each of the first half 110a and second half
110b and the lower edge 34b of the secondary shear blade 34 should
be in the range of -10.degree. to +35. FIG. 10 shows an angle
.alpha.1 of +10.degree.. This optimization tends to prevent the
piercing tip 110 from moving outward from the secondary blade 34 as
the piercing tip 110 contacts the workpiece.
Second, as best seen in FIGS. 5 and 9, an angle .alpha.2 between
the fourth mounting surface 110d and the top edge 34c of the
secondary shear blade 34 should be in the range of -20.degree. to
+25.degree.. FIG. 9 shows an angle .alpha.2 of +10.degree.. This
optimization helps to hold the tip 110 in place on the upper jaw 14
from a force trying to push the tip 110 forward from the forward
edge 34a of the secondary shear blade 34.
Third, as best seen in FIGS. 5 and 11, an angle .alpha.3 between
the front surface 110g of either the first half 110a or the second
half 110b, and the lower edge 34b of the secondary shear blade 34
should be in the range of 55.degree. to 75.degree.. In the
embodiment shown in the phantom line L in FIG. 12, the angle
.alpha.3 is measured between the lower edge 34b and a line L from
the top corner 110g1 to the bottom corner 110g2 of the front
surface 110g.
Fourth, as best seen in FIG. 12, an angle .alpha.4 between the
bottom edge 110f of the replaceable shearing tip 110 and the ledge
or flange 110c should be in the range of -15.degree. to
+15.degree..
FIG. .[.14.]. .Iadd.13 .Iaddend.shows the sequence of positions
that the tip 110 will take within the lower jaw 12 as the upper jaw
14 closes on the lower jaw 12. It will be seen that force directed
against the tip 110 by the workpiece will result in force being
applied to the secondary shearing blade 34 at a variety of angles
as the tip successively encounters and the penetrates the workpiece
(not shown). The structure of the tip 110 serves to keep the tip
110 firmly in contact with the secondary shear blade 34 with
minimum stress.
The present invention may be embodied in other specific forms
without departing from the spirit or essential attributes thereof,
and it is therefore desired that the present embodiment be
considered in all respects as illustrative and not restrictive
reference being made to the appended claims rather than to the
foregoing description to indicate the scope of the invention.
* * * * *