U.S. patent number 3,756,121 [Application Number 05/192,072] was granted by the patent office on 1973-09-04 for combination action spring guide and buffer for automatic pistol.
This patent grant is currently assigned to Colt Industries Operating Corp.. Invention is credited to Robert Roy.
United States Patent |
3,756,121 |
Roy |
September 4, 1973 |
COMBINATION ACTION SPRING GUIDE AND BUFFER FOR AUTOMATIC PISTOL
Abstract
A gas recoil operated automatic pistol having a slide
reciprocably mounted on a frame and a single resilient element of
tough, form sustaining plastic serving both as a guide for a slide
action spring and as a recoil buffer for absorbing slide impact
energy which is normally imparted directly onto the frame.
Inventors: |
Roy; Robert (East Haven,
CT) |
Assignee: |
Colt Industries Operating Corp.
(Hartford, CT)
|
Family
ID: |
22708113 |
Appl.
No.: |
05/192,072 |
Filed: |
October 26, 1971 |
Current U.S.
Class: |
89/196;
89/198 |
Current CPC
Class: |
F41A
3/86 (20130101); F41A 25/22 (20130101) |
Current International
Class: |
F41A
25/00 (20060101); F41A 25/22 (20060101); F41A
3/86 (20060101); F41A 3/00 (20060101); F41d
011/12 () |
Field of
Search: |
;89/163,177,196,198,44A |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Materials In Design Engineering, Mid-October, 1964, Vol. 60, No. 5,
pp. 226-227.
|
Primary Examiner: Bentley; Stephen C.
Claims
I claim:
1. A gas recoil operated automatic pistol comprising an elongated
frame, a main coil compression spring extending longitudinally of
the frame, a slide removably mounted on the frame for reciprocating
longitudinal movement between forward and rear positions, the slide
having a forward portion with a sleeve integrally formed thereon,
the spring having a forward end engaging the slide within its
sleeve and urging the slide toward its forward position, a barrel
mounted in assembled relation to the slide for assembly and
disassembly therewith relative to the frame, the barrel having a
depending barrel camming lug disposed in rearwardly spaced
alignment with the slide sleeve, the frame having a slide stop
surface disposed in alignment with the path of movement of the
slide, and a combination spring guide and buffer having a one-piece
elongated body formed in its entirety of a tough form sustaining
resilient nonmetallic material, the body having a rod portion
received at least in part within the spring and the slide sleeve to
guide and support the spring, the body having an integral end
portion formed as a radially enlarged flange on a rear end of the
rod portion, its end portion being disposed in alignment with and
between the barrel lug and the slide sleeve and biased by the
spring into seating engagement with the slide stop surface for
impact buffering of the slide in its rear position while
additionally providing a seat for the rear end of the spring, the
rod portion of the combination spring guide and buffer being
sufficiently resilient to permit limited bending of the rod portion
without permanent deformation, upon removal of the assembled barrel
and slide from the frame, to flex the rod portion while being
retained in part within the slide sleeve and to move the end
portion out of alignment with the barrel lug for facile assembly
and disassembly of the combination spring guide and buffer in
relation to the assembled barrel and slide.
2. The pistol of claim 1 wherein the combination spring guide and
buffer is formed of nylon resin.
3. The piston of claim 1 wherein the frame includes a recess
centrally disposed to extend rearwardly of its slide stop surface,
and wherein the radially enlarged flange includes a self-locating
rearwardly extending projection received in said recess.
Description
FIELD OF THE INVENTION
This invention generally relates to pistols and particularly
concerns a buffer for automatic pistols.
BACKGROUND OF THE INVENTION
In the design of automatic pistols, critical space limitations
normally eliminate any possibility whatsoever of a designer
incorporating a buffer. Conventional designs normally result in an
operating slide of the pistol pounding metal abutments out of shape
and possibly breaking or otherwise rendering such parts inoperative
over extended period of service. This longstanding problem has
resulted in numerous attempts by designers to provide recoil
buffers for pistols but such efforts frequently have resulted in
added manufacturing and assembly costs and in undue bulky size of
the resulting weapon package.
OBJECTS OF THE INVENTION
Accordingly, a primary object of this invention is to provide a
significantly compact buffer for use with an automatic pistol to
absorb slide recoil impact energy.
Another object of this invention is to provide such a buffer which
is not only compact but economical to manufacture and which is
particularly suited to facilitate assembly and disassembly of
operating components of the pistol.
Other objects will be in part obvious and in part pointed out in
more detail hereinafter.
A better understanding of the objects, advantages, features,
properties and relationships of the invention will be obtained from
the following detailed description and accompanying drawings which
set forth certain illustrative embodiments and is indicative of the
way in which the principle of the invention is employed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary side view, partly broken away and partly in
section, of a pistol incorporating this invention and showing a
slide assembly of the pistol in a forward operative limit
position;
FIG. 2 is a view similar to FIG. 1 wherein the slide assembly is in
a rear operative limit position;
FIG. 3 is a reduced side view of the slide assembly; and
FIG. 4 is a fragmentary isometric view of a rear end portion of
another embodiment of a combination spring guide and buffer
incorporated in this invention.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to the drawings wherein a preferred embodiment of this
invention is illustrated, an automatic pistol 10 incorporating this
invention is shown generally comprising a frame or receiver 12,
barrel 14 and operating slide 16 suitably supported for
reciprocable sliding movement on the receiver 12. During manual
cocking and also during automatic recoil upon firing, the slide 16
moves rearwardly to an extent limited by a slide stop surface or
abutment wall 18 on the receiver 12. Shoulders 20 inside slide 16
engage abutments 22 on an enlarged rear barrel portion 24 to drive
barrel 14 rearwardly with the slide 16 from its forward position
shown in FIG. 1. Barrel 14 disengages from slide 16 during its
rearward movement and is arrested at an intermediate point in the
travel of the slide 16 to provide for cartridge extraction and
ejection, and then to strip a live round from a magazine (not
shown) to be chambered, such as the round 26 shown in FIG. 1, upon
return forward movement of the slide 16 under the force of its main
spring or action spring 28.
Pistol 10 utilizes a well known firing operation wherein pivoting
its trigger 30 rearwardly about its pivot pin 32 actuates a hammer,
not shown, causing the chambered round 26 to be fired in a
conventional manner whereupon automatic operation of the slide
assembly 16 is effected.
As fully described in applicant's United States patent application
Ser. No. 864,609, filed Oct. 8, 1969, entitled "Pistol" granted
Aug. 8, 1972 as U.S. Pat. No. 3,682,040 and assigned to the
assignee of this invention, barrel 14 is precisely located during
reciprocation of the slide 16 by a positive barrel guide and stop
mechanism 34. Mechanism 34 includes a barrel lug 36 projecting
downwardly from the rear barrel portion 24 in a vertical plane
extending through a longitudinal center line of the barrel 14 for
limited captured movement between a pair of camming pins 38, 40
extending in longitudinally spaced relation across receiver 12.
Barrel lug 36 has front and rear abutments 42 and 44 of arcuate
shape conforming to confronting peripheral surfaces of the front
and rear camming pins 38 and 40 which are of circular cross
section. As the slide 16 is thrust rearwardly under the reaction
force of the gases formed upon explosion of a chambered round, rear
abutment 44 engages a lower portion of rear camming pin 40 which
cams barrel 14 downwardly to an extent limited by full contact
engagement between the confronting surfaces of the rear lug
abutment 44 and rear camming pin 40, thereby establishing a lowered
rear limit position (FIG. 2) for the barrel 14 in disengaged
relation to slide 16 to permit it to continue to move rearwardly
uninterruptedly to a rear operative limit position (FIG. 2).
Camming pin 38 is fixed forwardly of and below rear camming pin 40
and provides a relatively large area of intersurface contact with
the barrel lug 36 to positively guide and stop barrel 14 in a
raised forward position in locked engagement with the slide 16 in
its forward operative limit position (FIG. 1) upon return forward
movement of the slide 16 under the biasing force of its spring 28
which was previously compressed during slide recoil.
To absorb recoil impact energy of the slide 16 and at the same time
to provide guidance and support for the action spring 28 while also
facilitating assembly and disassembly of the components and
additionally permitting sleeve 54 to be formed with an increased
cross sectional thickness in accordance with this invention, a
combination guide rod and buffer 50 is provided having a one-piece
form sustaining body of a suitable tough resilient plastic with a
radially enlarged head 52 serving both as a spring seat and as an
abutment surface for spring guide sleeve 54. Sleeve 54 is formed as
an integral part of slide 16 on a forward lower end of the slide
16, and barrel bushing 55 is carried by slide 16 in overlying
parallel relation to sleeve 54. Upon engagement of sleeve 54 with
the head 52 of guide rod 50 (FIG. 2), rearward slide movement is
terminated and the recoil energy impact, which is normally directly
transferred to the frame in conventional pistols, is absorbed by
buffer 50 upon compressive engagement of its head portion 52
between abutment wall 18 of the receiver 12 and sleeve 54.
In the specific illustrated embodiment, the combination guide rod
and buffer 50 is preferably formed of a suitable high impact resin
which, for example, may be selected from a family of nylon resins
such as that sold under the trademark "Zytel" manufactured by E. I.
dupont de Nemours & Co. Such nylon resins have been found to
work satisfactorily to resist abrasion and repeated impact loads
over a wide range of temperatures while additionally resisting the
action of salts and salt solutions and being unaffected by
electrolytic corrosion. "Zytel" nylon resins have provided
desirable characteristics for the combination guide rod and buffer
50 in that its mechanical toughness increases with age, and both
moisture and heat desirably increase the flexibility of the nylon
component, conditioning it to absorb more energy before any
potential rupture as well as its impact resistance which is of
crucial importance in an application such as the disclosed use in
repeatedly absorbing impact energy of the slide 16 over an extended
period of time. The resiliency of the nylon part ensures
deformation under load and return to its original dimensions
without noticeable wear. The nylon combination guide rod and buffer
50 moreover is neither affected by lubricating oils and greases nor
by most chemicals and is particularly adapted to be quickly and
easily molded with little or no finishing required.
A particular advantage in utilizing the combination guide rod and
recoil buffer 50 for continued use under rugged conditions is the
high degree of elongation before rupture of the nylon resins. In
this respect certain nylon resins, e.g., "Zytel 101," has
approximately 25 percent elongation at a tensile stress yield point
of about 8500 psi under conditions of 73.degree. F temperature and
2.5 per cent moisture content while having an ultimate strength of
about 11,000 psi and approximately 300 percent elongation under the
same conditions. Moreover, this same nylon resin under average air
exposure conditions of 73.degree. F and 2.5 per cent moisture
content conditions has been found to have a modulus of elasticity
of about 200,000 psi, the modulus of elasticity under such
conditions ranging from about 500,000 psi at -35.degree. F to
70,000 psi at 220.degree. F.
By virtue of the above disclosed construction, the combination
guide rod and buffer 50 has the additional desirable advantage of
being relatively flexible to permit not only facile assembly and
disassembly relative to the sleeve 54 but also permits its cross
sectional thickness to be built up for added strength and
durability while yet permitting quick and easy disassembly and
reassembly of the buffer 50 relative to its slide assembly 16. This
advantage is due to the resiliency of the combination guide rod and
buffer body which upon being assembled or disassembled relative to
the slide bushing 54 may be flexed as best seen in FIG. 3 to more
readily position the buffer 50 in operative relation relative to
the slide assembly 16. The rear portion of sleeve 54 surrounding
its opening accordingly may be of greater thickness to accommodate
the removal and insertion of the buffer 50 than if it were
otherwise made of a rigid non-resilient material such as a
conventional metal.
FIG. 4 shows another embodiment of an enlarged radial head portion
52A of a buffer body having a rearwardly extending projection or
stud 56 which may be useful as a locating device for receipt within
a complementary opening, such as shown in broken lines at 58 in
FIG. 2, in the receiver 12 for quickly and easily positioning the
buffer 50 in operative relation to the slide 16. If desired, the
rear face of the head 52, 52A may be formed with an indentation
such as at 60 to maintain the buffer 50 and action spring 28 in
assembly with the barrel lug 36 upon removal of the slide 16 from
the receiver 12.
A combination guide rod and buffer 50 of a type disclosed in this
invention will not only provide guidance for the slide action
spring 28 but will additionally and repeatedly absorb high impact
loads for providing a continuous buffering action responsive to
automatic operation of the pistol 10 under extended service
requirements. The maintenance requirements of this buffer are
minimal and the overall weapon package is easily maintained within
desirable design limits due to the compact and composite
construction of the combination guide rod and buffer 50. The
flexibility of the buffer 50 additionally adds to the ease of field
stripping and subsequent reassembly while also permitting those
portions of the sleeve 54 which receive the spring 28 and buffer 50
to be built up for increased strength and durability.
As will be apparent to persons skilled in the art, various
modifications, adaptations and variations of the foregoing specific
disclosure can be made without departing from the teachings of the
present invention.
* * * * *