U.S. patent application number 13/446362 was filed with the patent office on 2012-10-25 for extractor and bolt for a firearm.
Invention is credited to Paul M. Hochstrate, Kevin Richard Langevin.
Application Number | 20120266512 13/446362 |
Document ID | / |
Family ID | 47009990 |
Filed Date | 2012-10-25 |
United States Patent
Application |
20120266512 |
Kind Code |
A1 |
Langevin; Kevin Richard ; et
al. |
October 25, 2012 |
EXTRACTOR AND BOLT FOR A FIREARM
Abstract
A bolt, having: an extractor pivotally thereto for movement
between at least a first position and a second position, a hook
member located at a distal end of the extractor, wherein the hook
member is at least partially received within a pocket on a muzzle
end of the bolt and the hook member moves away from a center line
of the bolt as the hook member is moved from the first position
towards the second position, wherein a bottom of the pocket is
recessed within a first range A in a first direction from the
muzzle and the hook member has an axial thickness parallel to the
center line within a first range A' and wherein the hook member is
flush with the muzzle when the hook member is in the second
position.
Inventors: |
Langevin; Kevin Richard;
(Berlin, CT) ; Hochstrate; Paul M.; (Plantsville,
CT) |
Family ID: |
47009990 |
Appl. No.: |
13/446362 |
Filed: |
April 13, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61475487 |
Apr 14, 2011 |
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Current U.S.
Class: |
42/14 |
Current CPC
Class: |
F41A 15/12 20130101;
F41A 15/14 20130101 |
Class at
Publication: |
42/14 |
International
Class: |
F41A 15/12 20060101
F41A015/12; F41A 3/12 20060101 F41A003/12 |
Claims
1. A bolt for a firearm, comprising: an extractor pivotally mounted
to the bolt for movement between at least a first position and a
second position, the extractor having a hook member located at a
distal end of the extractor, wherein the hook member is at least
partially received within a pocket on a muzzle end of the bolt and
the hook member moves away from a center line of the bolt as the
hook member is moved from the first position towards the second
position, wherein a bottom of the pocket is recessed at least a
first dimension within a first range A that is greater than 0.130
inches and less than 0.200 inches in a first direction from the
muzzle end of the bolt and the hook member has an axial thickness
parallel to the center line of the bolt within a first range A'
that is greater than 0.050 inches and less than 0.130 inches and
wherein the hook member is flush with the muzzle end of the bolt
when the hook member is in the second position.
2. The bolt as in claim 1, wherein the hook member of the extractor
is spring biased towards the center line of the bolt by a spring
located on the bolt.
3. The bolt as in claim 1, wherein the hook member is located at a
first end of the extractor and the spring is located to provide a
biasing force to an opposite end of the extractor.
4. The bolt as in claim 3, wherein the extractor is pivotally
mounted to the bolt a location between the first end and the
opposite end of the extractor.
5. The bolt as in claim 1, wherein the bolt is configured for use
in a semiautomatic or automatic firearm.
6. The bolt as in claim 1, wherein the bolt is configured for use
in a semiautomatic or automatic firearm rifle.
7. The bolt as in claim 5, wherein the hook member of the extractor
is spring biased toward the center line by a spring located on the
bolt.
8. The bolt as in claim 7, wherein the hook member is located at a
first end of the extractor and the spring is located to provide a
biasing force to an opposite end of the extractor.
9. The bolt as in claim 8, wherein the extractor is pivotally
mounted to the bolt a location between the first end and the
opposite end of the extractor.
10. The bolt as in claim 1, wherein the bolt is configured for use
with a .308 caliber round.
11. The bolt as in claim 1, wherein the first range A is greater
than 0.135 inches and less than 0.175 inches and the first range A'
is greater than 0.055 inches and less than 0.105 inches.
12. The bolt as in claim 1, wherein the first range A is greater
than 0.140 inches and less than 0.150 inches and the first range A'
is greater than 0.060 inches and less than 0.080 inches.
13. The bolt as in claim 11, wherein the hook member of the
extractor is spring biased towards the center line of the bolt by a
spring located on the bolt and wherein the hook member is located
at a first end of the extractor and the spring is located to
provide a biasing force to an opposite end of the extractor.
14. The bolt as in claim 13, wherein the extractor is pivotally
mounted to the bolt a location between the first end and the
opposite end of the extractor.
15. The bolt as in claim 11, wherein the bolt is configured for use
in a semiautomatic or automatic firearm.
16. The bolt as in claim 12, wherein the hook member of the
extractor is spring biased towards the center line by a spring
located on the bolt and wherein the hook member is located at a
first end of the extractor and the spring is located to provide a
biasing force to an opposite end of the extractor.
17. The bolt as in claim 16, wherein the bolt is configured for use
in a semiautomatic or automatic firearm.
18. The bolt as in claim 17, wherein the bolt is configured for use
with a .308 caliber round.
19. A bolt for a firearm, comprising: an extractor pivotally
mounted to the bolt for movement between a first position and a
second position, the extractor having a hook member located at a
distal end of the extractor, wherein the hook member is at least
partially received within a pocket on a muzzle end of the bolt and
the hook member moves away from a center line of the bolt as the
hook member is moved from the first position towards the second
position, wherein a bottom of the pocket is recessed at least a
first dimension of 0.145 inches in a first direction from the
muzzle end of the bolt and the hook member has an axial thickness
of 0.075 inches in the first direction and parallel to the center
line of the bolt and wherein the hook member is flush with the
muzzle end of the bolt when it is in the second position.
20. The bolt as in claim 19, wherein the hook member of the
extractor is spring biased towards the center line of the bolt by a
spring located on the bolt and wherein the hook member is located
at a first end of the extractor and the spring is located to
provide a biasing force to an opposite end of the extractor and
wherein the extractor is pivotally mounted to the bolt a location
between the first end and the opposite end of the extractor and
wherein the bolt is configured for use in a semiautomatic or
automatic firearm and wherein the bolt is configured for use with a
.308 caliber round.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Patent Application No. 61/475,487 filed Apr. 14, 2011, the contents
of which are incorporated herein by reference thereto.
BACKGROUND
[0002] Various embodiments of the present invention are related to
a bolt and extractor for a firearm and, more particularly, to an
improved bolt and extractor configuration.
[0003] Automatic and/or semiautomatic firearms comprise complex
mechanisms that are subject to continuous cycling each time a round
is fired as such, certain components are subject to wear and must
be cleaned and/or replaced on a periodic basis. Accordingly, it is
desirable to provide a firearm or components of a firearm that
withstand excessive cycling and thus extend the useful life of such
components in order to reduce the need for replacement.
SUMMARY
[0004] In one exemplary embodiment, a bolt for a firearm is
provided herein, the bolt having: an extractor pivotally mounted to
the bolt for movement between at least a first position and a
second position, the extractor having a hook member located at a
distal end of the extractor, wherein the hook member is at least
partially received within a pocket on a muzzle end of the bolt and
the hook member moves away from a center line of bolt as the hook
member is moved from the first position towards the second
position, wherein a bottom of the pocket is recessed at least a
first dimension within a first range A that is greater than 0.130
inches and less than 0.200 inches in a first direction from the
muzzle end of the bolt and the hook member has an axial thickness
parallel to the center line of the bolt within a first range A'
that is greater than 0.050 inches and less than 0.130 inches and
wherein the hook member is flush with the muzzle end of the bolt
when the hook member is in the second position.
[0005] In another embodiment, a bolt for a firearm is provided the
bolt having an extractor pivotally mounted to the bolt for movement
between at least a first position and a second position, the
extractor having a hook member located at a distal end of the
extractor, wherein the hook member is at least partially received
within a pocket on a muzzle end of the bolt and the hook member
moves away from a center line of bolt as the hook member is moved
from the first position towards the second position, wherein a
bottom of the pocket is recessed 0.145 inches from the muzzle end
in a first direction parallel to the center line of the bolt and
the hook member has an axial thickness of 0.075 inches in the first
direction and wherein the hook member is flush with the muzzle end
of the bolt.
[0006] Additional features and advantages are realized through the
techniques of the present invention. Other embodiments and aspects
of the invention are described in detail herein and are considered
a part of the claimed invention. For a better understanding of the
invention with advantages and features, refer to the description
and to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The invention, in accordance with preferred and various
embodiments, together with further objects and advantages thereof,
is more particularly described in the following detailed
description taken in conjunction with the accompanying drawings in
which:
[0008] FIG. 1 is a cross-sectional view of a bolt and extractor in
accordance with an exemplary embodiment of the present
invention;
[0009] FIGS. 1A-1C are additional partial view of the bolt and
extractor in accordance with an exemplary embodiment of the present
invention; and
[0010] FIG. 2 is a view of a firearm according to a non-limiting
exemplary embodiment of the present invention.
[0011] The detailed description explains various embodiments of the
present invention, together with advantages and features, by way of
example with reference to the drawings.
DETAILED DESCRIPTION
[0012] Referring now to FIGS. 1 and 1A-1C, a bolt 10 for a firearm
11 is illustrated. One non-limiting example of a firearm utilizing
bolt 10 is illustrated in United States Patent Publication Number
2010/0300277 in the name of Hochstrate et al., the contents of
which are incorporated herein by reference thereto.
[0013] As is known in the related arts, bolt 10 is received within
a bolt carrier that is slidably received within an upper receiver
of a firearm wherein the bolt carrier is acted upon by expanding
gases generated by the firing of a bullet from a cartridge.
[0014] In general, the extractor pivots on the bolt to engage a
cartridge with a hook and after firing of that cartridge the
engagement of the hook with the cartridge is used to empty or
extract the empty case from the barrel such that a new unfired
cartridge can be inserted into the barrel by the bolt.
[0015] In order for the bolt to engage the cartridge a portion of
the cartridge is received within a pocket on the muzzle end of the
bolt and the hook engages a rim of the cartridge when it is
received within the pocket. The extractor hook pivots away from the
center axis of the bolt to allow for insertion of the cartridge
into the bolt and then pivots back towards the center axis by a
spring biasing force in order to engage the cartridge rim once the
cartridge is fully seated in the pocket of the bolt. At this point
the extractor hook is forced into a groove of the cartridge. After
the cartridge is fired the action of the firearm moves the bolt
rearward and the hook which is now fully engaged with the case rim
pulls the case out of the chamber. However, the shear forces
generated by the resistance of the case removal from the chamber
and the rearward movement of the bolt pull on the extractor may
cause the extractor to fail prematurely. Accordingly, it is
desirable to provide an extractor hook and bolt design that can
withstand numerous cycling events in order to avoid premature
extractor hook replacement due to hook failure.
[0016] As illustrated in FIG. 1, bolt 10 has an extractor 12 that
is pivotally or movably mounted to the bolt for movement between a
first position and at least a second position wherein the second
position corresponds to the extractor engaging a cartridge received
within a portion of the bolt and the first position corresponds to
the location of the extractor when the bolt is not engaging a
cartridge. It being understood that the extractor will have to move
to at least one other position in order to allow a cartridge to be
received within the bolt. Thus, movement of the hook member 14 in
the direction of arrows 17 is contemplated.
[0017] As illustrated and in order for the extractor to engage the
cartridge, the extractor has a hook member 14 located at a distal
end 16 of the extractor 12. The hook member 14 is at least
partially received within a seat or pocket 18 recessed on a forward
or muzzle end 20 of the bolt. The hook member is flush with the
muzzle end of the bolt when it is in the second position and the
hook member moves away from a center line 21 of the bolt as the
hook is moved from the first position to allow for a portion of a
cartridge 24 to be received within the pocket. Thereafter, the hook
member moves back towards the center line 21 and engages a rim 22
of the cartridge 24.
[0018] After the cartridge is fired the action of the firearm moves
the bolt rearward with respect to a forward end or muzzle of the
firearm and the hook member which is now fully engaged with the
case or cartridge rim 22 pulls the case or cartridge out of the
chamber.
[0019] In accordance with an exemplary embodiment and in order to
provide a more robust hook member 14 of the extractor 12 a bottom
30 of the seat or pocket 18 is recessed at least a first dimension
32 from the forward or muzzle end 20 of the bolt in a first
direction illustrated by arrow 33, which is parallel to the central
axis or center line 21 of bolt. In addition, the hook member has an
axial thickness 34 that is also parallel to the central axis or
center line 21 of bolt. As will be detailed below, the axial
thickness of the hook member is a function of the depth of the
bottom of the pocket from the muzzle end of the bolt in the
direction of arrow 33.
[0020] In accordance with one embodiment, the first dimension is
within a first range A that is greater than 0.130 inches and less
than 0.200 inches in the first direction from the forward or muzzle
end of the bolt. Still further and in another embodiment the first
dimension is within a second range B that is greater than 0.135
inches and less than 0.175 inches in the first direction from the
forward or muzzle end of the bolt. In yet another embodiment, the
first dimension is within a third range C that is greater than
0.140 inches and less than 0.150 inches in the first direction from
the forward or muzzle end of the bolt. One exemplary dimension of
the first dimension is 0.145 inches. Of course, it is understood
that numerous nested ranges and dimensions within the
aforementioned ranges are contemplated to be within the scope of
exemplary embodiments of the present invention.
[0021] In addition and in conjunction with the dimension of the
depth of the seat or pocket 18 of the bolt the dimension or axial
thickness of the hook member hook member is within a first range A'
that is greater than 0.050 inches and less than 0.130 inches when
the first dimension of the seat is within range A. In another
embodiment and in conjunction with the dimension of the depth of
the seat or pocket 18 of the bolt, the dimension or axial thickness
of the hook member is within a second range B' that is greater than
0.055 inches and less than 0.105 inches when the first dimension of
the seat or pocket is within range B. Still further and in another
embodiment, the dimension or axial thickness of the hook member
hook member is within a third range C' that is greater than 0.060
inches and less than 0.080 inches when the first dimension of the
seat or pocket is within range C.
[0022] One exemplary dimension or axial thickness of the hook
member is 0.075 inches when the first dimension or depth of the
pocket is 0.145 inches. Of course, it is understood that numerous
nested ranges and dimensions within the aforementioned ranges are
contemplated to be within the scope of exemplary embodiments of the
present invention. The aforementioned ranges and dimensions have
shown an improved working life expectancy of the extractor hook
without the deleterious effects from extending the cartridge to far
from the end of the barrel.
[0023] In addition and as illustrated in FIG. 1, the hook member is
flush with the muzzle portion of the bolt when the hook member is
in the second position such that no portion of the hook member
extends past the forward or muzzle end of the bolt.
[0024] In order for the extractor 12 to engage the rim 22 of the
cartridge the hook member of the extractor is spring biased towards
the center line of the bolt by a spring 36 that is located on the
bolt. In one implementation, the hook member is located at a first
end of the extractor and the spring is located to provide a biasing
force to an opposite end of the extractor.
[0025] In one embodiment, the bolt 10 and extractor 12 are
configured for use with a .308 caliber round or 7.62 mm NATO round
as currently configured. However, the bolt and extractor may be
configured for use with numerous other sized rounds for example,
one non-limiting other sized round may be a 5.56 mm NATO round.
[0026] While the invention has been described with reference to an
exemplary embodiment, it will be understood by those skilled in the
art that various changes may be made and equivalents may be
substituted for elements thereof without departing from the scope
of the invention. In addition, many modifications may be made to
adapt a particular situation or material to the teachings of the
invention without departing from the essential scope thereof.
Therefore, it is intended that the invention not be limited to the
particular embodiment disclosed as the best mode contemplated for
carrying out this invention, but that the invention will include
all embodiments falling within the scope of the present
application.
* * * * *