U.S. patent application number 15/654945 was filed with the patent office on 2019-01-24 for precision case holder.
The applicant listed for this patent is Larry Goodman. Invention is credited to Larry Goodman.
Application Number | 20190025034 15/654945 |
Document ID | / |
Family ID | 65018826 |
Filed Date | 2019-01-24 |
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United States Patent
Application |
20190025034 |
Kind Code |
A1 |
Goodman; Larry |
January 24, 2019 |
Precision Case Holder
Abstract
A precision case holder engages the extraction groove of the rim
of a straight wall case and established a fixed distance between a
base of the case and a precision forward surface of the holder. The
case may then be inserted into a case trimmer and the holder
establishes a repeatable distance between the base of the case and
a cutting tool in the case trimmer. The holder includes a tapered
slot with edges which engage the extraction groove and a threaded
piston which is tightened against the base of the case. The case
slides into the tapered slot until the taper resists further
sliding, and the piston is tightened to retain the case.
Inventors: |
Goodman; Larry; (Cerritos,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Goodman; Larry |
Cerritos |
CA |
US |
|
|
Family ID: |
65018826 |
Appl. No.: |
15/654945 |
Filed: |
July 20, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F42B 33/10 20130101;
F42B 35/02 20130101; B23B 5/168 20130101; B23B 2215/10 20130101;
B23B 35/00 20130101 |
International
Class: |
F42B 35/02 20060101
F42B035/02 |
Claims
1.-8. (canceled)
9. A method for trimming straight wall cases, comprising: sliding a
base of one of the straight wall cases into a tapered slot of a
case holder, the case holder comprising: a face piece including: a
face having the tapered slot including a wide end, and a narrow end
opposite to the wide end, the tapered slot narrowing from the wide
end to the narrow end and ending at the narrow end; and claws
reaching in on each side of the tapered slot; and a tail piece
configured to advance towards the face piece to capture the base of
the one of the straight wall cases in the tapered slot between the
tail piece and the face piece; holding the one of the straight wall
cases by the case holder; inserting a mouth of the one of the
straight wall cases into a case trimmer; and trimming the one of
the straight wall cases, wherein the tail piece of the case holder
threadedly engages the face piece to advance the tail piece towards
the face piece.
10. The method of claim 9, wherein the tapered slot of the case
holder tapers at about a three degree half angle.
11. The method of claim 9, wherein the tapered slot of the case
holder tapers down from 0.534 inches to 0.3 inches.
12. The method of claim 9, wherein the claws of the case holder
reach 0.05 inches into opposite sides of the tapered slot.
13. The method of claim 9, wherein the case holder further includes
a center piece residing between a forward surface of the tail piece
and a rearward facing interior wall of the face piece.
14. (canceled)
15. The method of claim 9, wherein the face piece of the case
holder includes a flat face is configured to bear against the case
trimmer to repeatably position the straight wall case in the case
trimmer.
16. The method of claim 9, wherein the case trimmer includes a
bearing on a face presented to the straight wall case, and the
method further including inserting the straight wall case through
the face and into the case trimmer until the case holder resided
against the bearing for trimming the straight wall case to the
correct length.
17. The method of claim 16, wherein the bearing includes an inner
race aligning the straight wall case with a cutter in the case
trimmer for trimming the straight wall case.
18. The method case holder of claim 9, wherein: the tapered slot
tapering from a first width 0.534 inches of a first end and a
second width of 0.3 inches at a second end opposite to the first
end, at a half angle of three degrees, the tapered slot open at the
first end; the claws reach in on each side of the tapered slot
reaching in 0.05 inches; the tail piece threadably engaging the
face piece; and a center piece resides between a forward surface of
the tail piece and a rearward facing interior wall of the face
piece and entering the tapered slot
19. The method case holder of claim 9, wherein: the tail piece
threadably engaging the face piece; and a center piece resides
between a forward surface of the tail piece and a rearward facing
interior wall of the face piece; and wherein sliding the base of
the one of the straight wall cases into the tapered slot comprises
sliding an extraction groove of the straight wall case into the
tapered slot, the claws of the tapered slot engaging the extraction
groove of the straight wall case; and the method further includes
advancing the tail piece against the center piece to press the
center piece against the base of the straight wall case to grasp
the base of the straight wall case between the center piece and the
claws.
20. The method holder of claim 13, wherein the center piece is a
flat disk.
21. The method of claim 9, wherein sliding the base of the one of
the straight wall cases into the tapered slot comprises sliding the
base of the straight wall case into the tapered slot until the
narrowing of the tapered slot prevents further sliding into the
tapered slot; and the method further includes tightening the tail
piece into the face piece to grasp the straight wall case.
22. The method of claim 9, wherein the position of the straight
wall case in the tapered slot after sliding the straight wall case
into the tapered slot until the straight wall case can slide no
farther due to a taper of the tapered slot varies based on the
diameter of the straight wall case.
23. The method of claim 9, wherein the tapered slot has generally
straight edges.
24. The method of claim 9, wherein both the wide end and the narrow
end of the tapered slot are open.
25. The method of claim 9, wherein the tapered slot is fixed in the
face piece, the claws not opening or closing to grasp the straight
wall case.
26. A method for trimming straight wall cases, comprising: sliding
a base of one of the straight wall cases into a tapered slot of a
case holder, the case holder comprising: a face piece including: a
face having the tapered slot including generally straight edges and
having a wide end, and a narrow end opposite to the wide end, the
tapered slot narrowing from the wide end to the narrow end and
ending at the narrow end, and fixed claws reaching in on each edge
of the tapered slot; a tail piece configured to advance towards the
face piece to capture a base of the one of the straight wall cases
case in the tapered slot between the tail piece and the face piece;
and a flat disk shaped center piece between the tail piece and the
face piece; continuing sliding the base of the one of the straight
wall cases into the tapered slot until further sliding is prevented
by the narrowing of the tapered slot; tightening the tail piece
against the center piece to grasp the base of the one of the
straight wall cases between the center piece and the claws of the
face piece; holding the one of the straight wall cases by the case
holder; inserting a mouth of the one of the straight wall cases
into a case trimmer; and trimming the one of the straight wall
cases.
27. A method for trimming straight wall cases, comprising: sliding
a base of one of the straight wall cases into a tapered slot of a
case holder, the case holder comprising: a face piece including: a
flat face having the tapered slot including generally straight
edges and having a wide end, and a narrow end opposite to the wide
end, the tapered slot narrowing from the wide end to the narrow end
and ending at the narrow end, fixed claws reaching in on each edge
of the tapered slot, and a recess opposite to the face, the recess
containing female threads, a tail piece having male threads
engagable with the female threads of the face piece and configured
advance into the recess of the face piece; and a flat disk shaped
center piece residing in the recess of the face piece between the
tail piece and the face piece; continuing sliding the base of the
one of the straight wall cases into the tapered slot until further
sliding is prevented by the narrowing of the tapered slot;
tightening the tail piece into the recess in the face piece and
against the center piece to press the center piece against the base
of the one of the straight wall cases to grasp the base of the one
of the straight wall cases between the center piece and the claws
of the face piece; holding the one of the straight wall cases case
by the case holder; inserting a mouth of the one of the straight
wall cases into a case trimmer; and trimming the one of the
straight wall cases case.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to trimming and chamfering
ammunition case mouths and in particular to a tool holding a
straight wall case for trimming.
[0002] Ammunition cases are generally the most expensive component
of ammunition. Many shooting enthusiasts reuse the cases to save
money. While such cases may be capable of multiple uses, cases are
somewhat stretched in each use. Reloading stretched cases causes
variation in bullet seating and crimping, which affects
accuracy.
[0003] To address the case stretching, the cases are often trimmed
back to the original length. Unfortunately, there is no single
precision case holder to accurately position the case with respect
to a cutter to precisely trim various cases.
BRIEF SUMMARY OF THE INVENTION
[0004] The present invention addresses the above and other needs by
providing a precision case holder which engages the extraction
groove of the rim of a straight wall case and established a fixed
distance between a base of the case and a precision forward surface
of the holder. The case may then be inserted into a case trimmer
and the holder establishes a repeatable distance between the base
of the case and a cutting tool in the case trimmer. The holder
includes a tapered slot with edges which engage the extraction
groove and a threaded piston which is tightened against the base of
the case. The case slides into the tapered slot until the taper
resists further sliding, and the piston is tightened to retain the
case.
[0005] In accordance with one aspect of the invention, there is
provided a precision case holder which engages a variety of cases.
The holder includes a tapered slot with edges which engage the
extraction groove. The various size cases slide various distances
into the tapered slot allowing one tool to hold many case
sizes.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0006] The above and other aspects, features and advantages of the
present invention will be more apparent from the following more
particular description thereof, presented in conjunction with the
following drawings wherein:
[0007] FIG. 1 is a side view of a known case trimmer and a
precision case holder according to the present invention attached
to a drill motor.
[0008] FIG. 2 is a side view of a case and the known case trimming
assembly.
[0009] FIG. 3 is a side view of the known case trimming assembly
with the case in the known case trimming assembly.
[0010] FIG.4 is a cross-sectional view of the known case trimming
assembly according to the present invention with the case in the
case trimming assembly taken along line 4-4 of FIG. 3.
[0011] FIG. 5 shows a straight wall case held by the precision case
holder according to the present invention to position the case in
the case trimmer.
[0012] FIG. 6 shows the components of the precision case holder
according to the present invention.
[0013] FIG. 7A shows a side view of a face piece of the precision
case holder according to the present invention.
[0014] FIG. 7B shows a front view of the face piece of the
precision case holder according to the present invention.
[0015] FIG. 7C shows a rear view of the face piece of the precision
case holder according to the present invention.
[0016] FIG. 8 shows a cross-sectional view of the face piece of the
precision case holder according to the present invention to
position the case in the case trimmer taken along line 8-8 of FIG.
7B.
[0017] FIG. 9A shows a side view of a tail piece of the precision
case holder according to the present invention.
[0018] FIG. 9B shows a front view of the tail piece of the
precision case holder according to the present invention.
[0019] FIG. 9C shows a rear view of the tail piece of the precision
case holder according to the present invention.
[0020] FIG. 10 shows a cross-sectional view of the tail piece of
the precision case holder according to the present invention to
position the case in the case trimmer taken along line 10-10 of
FIG. 9B
[0021] FIG. 11A shows a side view of a center of the precision case
holder according to the present invention.
[0022] FIG. 11B shows a front view of the center piece of the
precision case holder according to the present invention.
[0023] FIG. 12 shows a cross-sectional view of the precision case
holder according to the present invention holding the straight wall
case.
[0024] FIG. 13 shows a front view of the precision case holder
according to the present invention holding the straight wall
case.
[0025] Corresponding reference characters indicate corresponding
components throughout the several views of the drawings.
DETAILED DESCRIPTION OF THE INVENTION
[0026] The following description is of the best mode presently
contemplated for carrying out the invention. This description is
not to be taken in a limiting sense, but is made merely for the
purpose of describing one or more preferred embodiments of the
invention. The scope of the invention should be determined with
reference to the claims.
[0027] An exploded side view of a known case trimmer 10 attached to
a drill motor 40, a straight wall case 30, and a precision case
holder 20 according to the present invention is shown in FIG. 1.
The case 30 may be attached to the holder 20 to insert the case 30
into a barrel 14 of the trimmer 10 for case trimming by a cutter
16, for example, an end mill, held by a micrometer dial 12. The
straight wall case 30 includes an extraction groove 32 just forward
of the case base 34. A suitable case trimmer is described in U.S.
Pat. No. 9,022,704 issued May 5, 2015, and U.S. patent application
Ser. No. 15/628,521, filed Jun. 20, 2017, both filed by the present
applicant, which applications are incorporated by reference into
the present application in their entirely.
[0028] A side view of the case trimming assembly 10 attached to a
drill motor 40 is shown in FIG. 2. The entire case trimming
assembly 10, with only the exception of a rotating inner race of a
case adapter bearing 18, is rotated by the drill motor 40. The user
holds the case 30 and inserts the case 30 into the case adapter
bearing 18 of the rotating case trimming assembly 10.
[0029] FIG. 3 shows the case inserted into the trimming assembly
10, and FIG. 4 shows a cross-sectional view of the case 30 inserted
into the trimmer 10 taken along line 4-4 of FIG. 3. A bottle neck
case seats against a contour in the case adapter bearing 18 to
limit insertion of the case into the trimming assembly 10, but
because the case 30 is a straight wall case, there is no simple way
to precisely control the depth of the insertion of the case 30 into
the case adapter bearing 18 of the trimming assembly 10 to
precisely trim the case to a desire length.
[0030] The straight wall case 30 held by the precision case holder
20 to position the case in the case trimmer 10 is shown in FIG. 5.
The extraction groove 32 of the case 30 engages claws 29 on
opposite sides of a tapered slot 28 in the face of the face piece
26 (see FIGS. 6 and 7B) and the center piece 24 (see FIG. 6, 11A,
and 11B).
[0031] Three components of the precision case holder 20 are shown
in an exploded view in FIG. 6.
[0032] A side view of a face piece 26 of the precision case holder
20 is shown in FIG. 7A, a front view of the face piece 26 is shown
in FIG. 7B, a rear view of the face piece is shown in FIG. 7C, and
a cross-sectional view of the face piece 26 taken along line 8-8 of
FIG. 7B, 20 is shown in FIG. 8. The face piece 26 includes a flat
face 31 having the tapered slot 28 having the claws 29 to engage
the extraction groove 32 of the straight wall case 30. The tapered
slot 28 tapers at a half angle A, and a first smaller width W1, and
has a second larger width W2. The angle A is preferably about 3
degrees, the width W1 is preferably about 0.3 inches, and the width
W2 is preferably about 0.534 inches. The claws 29 preferably have a
depth D of about 0.05 inches.
[0033] The face piece 26 further includes rear facing wall 29
facing the forward surface 25 of the tail piece 22, the center
piece 24 sandwiched between the rear facing wall 29 and the forward
surface 25. The face piece 26 further includes female threads 27 to
engage male threads 23 (see FIG, 6) of the tail piece 22 to
assemble the precision case holder 20 and to grasp the straight
wall case 30.
[0034] A side view of a tail piece 22 of the precision case holder
20 is shown in FIG. 9A, a front view of the tail piece 22 is shown
in FIG. 9B, a rear view of the tail piece 22 is shown in FIG. 9C,
and a cross-sectional view of the tail piece 26 taken along line
10-10 of FIG. 9B, is shown in FIG. 10. The tail piece 22 includes
the male threads 23 which engage the female threads 27 of the face
piece 26 (see FIG, 6) of the tail piece 22 to assemble the
precision case holder 20 and to grasp the straight wall case 30.
The tail piece 22 further includes a forward surface 25 which bears
against the center piece 24 to grasp the straight wall case 30. The
center piece preferably has a thickness T of about 1/8 inches.
[0035] A side view of the center piece 24 of the precision case
holder 10 is shown in FIG. 11A and a front view of the center piece
24 is shown in FIG. 11B. The center piece 24 is preferably a simple
flat disk.
[0036] A cross-sectional view of the precision case holder 20
holding the straight wall case 30 is shown in FIG. 12 and a front
view of the precision case holder 20 holding the straight wall case
30 is shown in FIG. 13. The case 30 slides into the tapered groove
28 until the claws prevent any further engagement, and then the
tail piece 22 is tightened to press the center piece 24 against the
base 34 of the straight wall case 30.
[0037] While the invention herein disclosed has been described by
means of specific embodiments and applications thereof, numerous
modifications and variations could be made thereto by those skilled
in the art without departing from the scope of the invention set
forth in the claims.
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