U.S. patent application number 13/177614 was filed with the patent office on 2012-01-12 for chamber adaptor incorporated into a modified action assembly for permitting substitution of a first manufacturer specified cartridge for a second substitute cartridge.
This patent application is currently assigned to CMMG, INC.. Invention is credited to Jordan Bowles, Tyson Bradshaw, Charles C. Kelly, John L. Overstreet, Taz B. Pfefer, Craig Pudil.
Application Number | 20120005931 13/177614 |
Document ID | / |
Family ID | 45437527 |
Filed Date | 2012-01-12 |
United States Patent
Application |
20120005931 |
Kind Code |
A1 |
Kelly; Charles C. ; et
al. |
January 12, 2012 |
CHAMBER ADAPTOR INCORPORATED INTO A MODIFIED ACTION ASSEMBLY FOR
PERMITTING SUBSTITUTION OF A FIRST MANUFACTURER SPECIFIED CARTRIDGE
FOR A SECOND SUBSTITUTE CARTRIDGE
Abstract
A retrofit chamber adaptor associated with a substitute action
assembly incorporated into a firearm for permitting the
substitution of an original designated cartridge for a substitute
cartridge. An elongated body is incorporated into a barrel
accessible location of the firearm and supporting a bolt in
reciprocating fashion. The chamber adaptor is mounted to forward
end of the body in communication with the reciprocating bolt and
exhibits a modified diameter aperture extending therethrough and
corresponding to an incremental modification in diameter associated
with the substitute cartridge. Additional features include a
receiver plate incorporated into the body and exhibiting a
generally lengthwise extending notched or keyed interior
established between generally parallel extending sides with
identified and interiorly notched locations for seating in
reciprocating fashion therebetween the reciprocating bolt. A
further variation of the adaptor exhibits a dual rail configuration
to which is reciprocally mounted the bolt and from which in turn
forwardly projects a firing pin. In a preferred application, the
chamber adaptor permits substitution of a 0.22 LR rimfire cartridge
in lieu of a normally designated 5.7.times.28 mm center fire
cartridge.
Inventors: |
Kelly; Charles C.;
(Kirksville, MO) ; Bowles; Jordan; (Columbia,
MO) ; Bradshaw; Tyson; (Kirksville, MO) ;
Pudil; Craig; (Boonville, MO) ; Pfefer; Taz B.;
(Ashland, MO) ; Overstreet; John L.; (Fayette,
MO) |
Assignee: |
CMMG, INC.
Fayette
MO
|
Family ID: |
45437527 |
Appl. No.: |
13/177614 |
Filed: |
July 7, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61362053 |
Jul 7, 2010 |
|
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Current U.S.
Class: |
42/14 |
Current CPC
Class: |
F41A 21/12 20130101;
F41A 21/10 20130101 |
Class at
Publication: |
42/14 |
International
Class: |
F41A 3/12 20060101
F41A003/12 |
Claims
1. A retrofit chamber adaptor associated with a substitute action
assembly incorporated into a firearm for permitting the
substitution of an original designated cartridge for a substitute
cartridge, said assembly comprising: an elongated body incorporated
into a barrel accessible location of the firearm and supporting a
bolt in reciprocating fashion; and said chamber adaptor mounted to
forward end of said body in communication with said bolt and
exhibiting a modified diameter aperture extending therethrough
corresponding to an incremental modification in diameter associated
with the substitute cartridge.
2. The assembly as described in claim 1, said body further
comprising of a receiver plate exhibiting a generally lengthwise
extending notched or keyed interior, established between generally
parallel extending sides with identified and interiorly notched
locations (for seating a reciprocating bolt.
3. The assembly as described in claim 1, said body further
comprising a dual rail configuration to which is reciprocally
mounted said bolt and from which in turn forwardly projects a
firing pin.
4. The assembly as described in claim 1, said chamber adaptor
exhibiting a specified shape and size and permitting substitution
of a 0.22 LR rimfire cartridge in lieu of a normally designated
5.7.times.28 mm center fire cartridge.
5. A retrofit chamber adaptor associated with a substitute action
assembly incorporated into a firearm for permitting the
substitution of an original designated cartridge for a substitute
cartridge, said assembly comprising: an elongated body incorporated
into a barrel accessible location of the firearm and supporting a
bolt in reciprocating fashion, said body further comprising of a
receiver plate exhibiting a generally lengthwise extending notched
or keyed interior, established between generally parallel extending
sides with identified and interiorly notched locations (for seating
a reciprocating bolt; and said chamber adaptor mounted to forward
end of said body in communication with said bolt and exhibiting a
modified diameter aperture extending therethrough corresponding to
an incremental modification in diameter associated with the
substitute cartridge.
6. A retrofit chamber adaptor associated with a substitute action
assembly incorporated into a firearm for permitting the
substitution of an original designated cartridge for a substitute
cartridge, said assembly comprising: an elongated body incorporated
into a barrel accessible location of the firearm and supporting a
bolt in reciprocating fashion, said body further comprising a dual
rail configuration to which is reciprocally mounted said bolt and
from which in turn forwardly projects a firing pin; and said
chamber adaptor mounted to forward end of said body in
communication with said bolt and exhibiting a modified diameter
aperture extending therethrough corresponding to an incremental
modification in diameter associated with the substitute cartridge.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application 61/362,053 filed Jul. 7, 2010.
FIELD OF THE INVENTION
[0002] The present invention is directed to a modified chamber
adaptor incorporated into a substitute firearm action assembly.
More specifically, the present invention discloses a uniquely
configured chamber adaptor for converting, in one non-limiting
application, from 5.7 mm.times.28 mm center fire cartridges to less
expensive and approximately diameter dimensioned 0.22 lr (inch)
rimfire cartridges.
BACKGROUND OF THE INVENTION
[0003] Center fire cartridges are well known in use with various
firearms. A disadvantage of using such cartridges such as in
particular for target practice and the like is the associated cost
in comparison to similar caliber rimfire cartridges, the latter
often being significantly less expensive. In one known instance,
5.7.times.28 centerfire ammunition is employed in such as AR15/M16
and FN PS90 firearms, however no suitable adaptor is available for
employing in the firearm action assembly for accepting
significantly less expensive 0.22 rimfire cartridges.
SUMMARY OF THE INVENTION
[0004] The present invention discloses a retrofit chamber adaptor
associated with a substitute action assembly incorporated into a
firearm for permitting the substitution of an original designated
cartridge for a substitute cartridge. An elongated body is
incorporated into a barrel accessible location of the firearm and
supporting a bolt in reciprocating fashion. The chamber adaptor is
mounted to forward end of the body in communication with the
reciprocating bolt and exhibits a modified diameter aperture
extending therethrough and corresponding to an incremental
modification in diameter associated with the substitute
cartridge.
[0005] Additional features include a receiver plate incorporated
into the body and exhibiting a generally lengthwise extending
notched or keyed interior established between generally parallel
extending sides with identified and interiorly notched locations
for seating in reciprocating fashion therebetween the reciprocating
bolt. A further variation of the adaptor exhibits a dual rail
configuration to which is reciprocally mounted the bolt and from
which in turn forwardly projects a firing pin. In one preferred but
non-limiting application, the chamber adaptor permits substitution
of a 0.22 LR rimfire cartridge in lieu of a normally designated
5.7.times.28 mm center fire cartridge.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Reference will now be made to the attached drawings, when
read in combination with the following detailed description,
wherein like reference numerals refer to like parts throughout the
several views, and in which:
[0007] FIGS. 1A and 1B are prior art illustrations of both center
fire 5.7.times.28 mm and 0.22 long rifle rim cartridges;
[0008] FIG. 2 is an illustration of a first version of a cartridge
chamber adaptor for use with such as AR15 style rifles;
[0009] FIG. 3 is an illustration of another version of cartridge
chamber adaptor for use with a Belgian FN P90 and PS90 personal
defense weapons;
[0010] FIG. 4 is an illustration of the bolt carrier and
action/recoil assembly associated with an AR-15 style assault
rifle;
[0011] FIG. 5 is an illustration of a corresponding bolt carrier
and recoil assembly associated with an FN P90/PS90 firearm; and
[0012] FIG. 6 is a diagrammatic illustration in cutaway of a
chamber adaptor incorporated into a substitute action assembly
associated with a P90/PS90 and further depicting the firing pin
associated with the bolt in contact with a rimfire location of the
substitute 0.22 LR cartridge.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] The present invention is directed to a uniquely configured
chamber adaptor incorporated into a substitute firearm action
assembly. More specifically, the present invention discloses a
chamber adaptor for converting, in one non-limiting application,
from 5.7 mm.times.28 mm center fire (see at 2 in FIG. 1A) to less
expensive 0.22 lr (inch) rimfire (see at 4 in FIG. 1B)
ammunition.
[0014] In operation, rim fire ammunition (as opposed to center fire
ammunition in which the firing pin strikes a primer cap at the
center of a base of the cartridge), includes a widened base rim
which is essentially a widened percussion cap containing the
desired priming compound, while the associated cartridge case
itself contains the propellant powder and projectile (bullet). By
virtue of this construction, rim fire ammunition can be produced
relatively less expensively than center fire cartridges,
reinforcing the value of a suitably constructed chamber adaptor
associated with a given weapon design, permitting substitution of
lesser expensive cartridges.
[0015] Referring also to each of FIGS. 4 and 5, assembled views are
shown of respective bolt carrier and recoil assemblies
incorporating a specifically constructed chamber adapter (further
respectively illustrated in FIGS. 2 and 3), for use with either an
AR-15 assault type rifle (FIGS. 2 and 4) or an FN P90/PS90 action
device (FIG. 3 and FIG. 5). It should be noted that the action
assemblies shown in FIGS. 4 and 5 includes resized and substitute
components associated with the receiver plate with inner notched
and supporting side rails, reciprocally mounted bolt and forwardly
positioned chamber adaptor, these substituting for original action
assemblies (not shown) which are provided with the originally
manufactured firearm.
[0016] Referring first to FIG. 4, in combination with the chamber
adaptor separately depicted in FIG. 2, an adaptor bolt subassembly
configured for an AR-15 style rifle is generally shown at 10 and
exhibits generally elongated body in the form of a receiver plate
at 12 and exhibits a generally lengthwise extending notched or
keyed interior, established between generally parallel extending
sides 14 and 16 with identified and interiorly notched locations
(hidden from view) for seating a reciprocating bolt 18 (such as but
not limited to a rim fire style bolt).
[0017] Forward projecting ends of the sides 14 and 16 extending
beyond the forward displaced position of the bolt 18 define further
end tabs for fixedly seating a chamber adaptor 20 with resized
interior aperture 21 for accepting the resized 0.22 LR cartridge
(and as also individually shown in FIG. 2). Additional features
associated with the chamber adaptor include a series of grooves
(one of which is illustrated at 23) associated with the main body
of the chamber adaptor for facilitating non-rotating seating of the
action assembly within the upper receiver barrel (not shown)
associated with the AR-15 type firearm. Also depicted at 25 is an
angled side groove to facilitate cartridge extraction associated
with the exiting shell and bolt reciprocation features of the AR-15
type firearm.
[0018] As is again shown in FIG. 4, the forward open ends of the
sides 14 and 16 are suitably configured (or notched) in order to
fixedly support the chamber insert 20. The notched interior defined
between the sides 14 and 16 is configured for seating the bolt 18
in a specified reciprocating range between a forward and bias
directed end (in contact with the chamber adaptor 20) as shown, and
a rearward counter-bias direction approximate a base
interconnecting surface 22 (again FIG. 4) of the notched
interior.
[0019] The configuration of the of a receiver plate at 12 and
exhibits a generally lengthwise extending notched or keyed
interior, established between generally parallel extending sides 14
and 16 with identified and interiorly notched locations (hidden
from view) for seating a reciprocating bolt 18 (such as but not
limited to a rim fire style bolt). A rearward projecting support
sleeve 24 includes an open interior for receiving and seating an
opposing guide rod 26 (about which is illustrated seated a biasing
coil spring), the rod 26 associated with a further mounting
location (see end disk 28) of the receiver plate 12 and in order to
maintain in assembled fashion the adaptor bolt subassembly
[0020] Specifically, and referring to FIG. 5 (in combination with
the individual illustration of chamber adaptor in FIG. 3), in
combination an illustration is again generally shown at 30 of a
corresponding bolt carrier and recoil assembly associated with an
FN P90/PS90 (FN Herstal) firearm. Unlike the AR-15 type action
assembly 10 which integrates within a separate upper action
receiver, the bolt carrier and recoil assembly 30 for use in the
Belgian FN Herstal P90/PS90 is configured in a bullpup design in
which both the action 30 and top loading magazine (not shown) are
located behind the trigger and alongside the shooter's face, such
that there is no wasted space for the buttstock, as in conventional
designs. This permits a shorter firearm length for the same barrel
length, saving weight and increasing maneuverability in confined
spaces.
[0021] Additional features of the P90/PS90 variants include the
pistol grip with a thumbhole and oversized trigger guard acting as
the forward grip, a handstop incorporated into the weapon's stock
preventing the user from accidentally reaching out in front of the
barrel during firing. The P90 is a modular firearm and consists of
sixty-nine parts that disassemble into four main groups, including
1) the barrel with integrated sight assembly, 2) the receiver with
return mechanism, 3) the stock body with trigger and firing
mechanism and 4) the magazine. As is also known, the P90 makes
extensive use of polymers and lightweight alloys to reduce both the
weight and the cost of the weapon.
[0022] Referring again to FIG. 5, the assembly 30 defines an
alternately configured elongate body which includes a dual rail 32
and 34 configuration to which is reciprocally mounted a bolt block
36 from which in turn forwardly projects a firing pin 38. The block
36 is illustrated in an intermediate position between a rear end
and a forward end which engages a reconfigured chamber adaptor 40
(also FIG. 3). Although not shown, a suitable biasing aspect
incorporated into the action assembly 30 (provided by such as a
spring or the like) provides proper recoil action of the bolt
36.
[0023] The adaptor 40 (referring to FIG. 3) includes a generally
widened block shape with a pair of apertures 42 and 44 defined
therethrough for seating over the rails 32 and 34. A central
aperture 46 exhibits a likewise resized profile (in comparison to
that shown at 21 in the AR-15 type chamber adaptor of FIG. 2) and
for accepting substitution 0.22 LR (inch) rimfire cartridges for
standard issue 5.7 mm.times.28 mm centerfire cartridges and further
given the relatively minimal disparity in diameter between the
cartridges. Otherwise, and beyond the disclosure provided herein,
the features associated with the FN P90/PS90 firearms are known in
the art and do not require further elaboration.
[0024] Finally, FIG. 6 illustrates a diagrammatic illustration in
cutaway of the substitute action assembly such as employed with a
P90/PS90 type firearm. Further depicted in the cutaway view is a
spring loaded firing pin, at 48, which is mounted within the bolt
block 36 and in order to be biased forwardly into contact with a
rimfire location of the substitute 0.22 LR cartridge 4. Also shown
is a bottom located ejector mechanism 50 and which, in cooperation
with the firing pin 48, facilitates ejection of the spent 0.22 LR
rimfire casing 4 prior to cyclical reloading as per the gas recoil
and reload particulars associated with a PN P90 type firearm.
[0025] Having described my invention, other and additional
preferred embodiments will become apparent to those skilled in the
art to which it pertains, such as providing additional configured
chamber adaptors (for use in any suitable weapon and for
substituting between any types of cartridges not limited to those
described herein) and without deviating from the scope of the
appended claims.
* * * * *