U.S. patent number 3,593,452 [Application Number 04/850,932] was granted by the patent office on 1971-07-20 for bolt stop for firearms.
This patent grant is currently assigned to Colt's Inc.. Invention is credited to Roger M. Pekarek.
United States Patent |
3,593,452 |
Pekarek |
July 20, 1971 |
BOLT STOP FOR FIREARMS
Abstract
A spring biased bolt stop is slidably retained in a passage
disposed in a trigger housing. A slidable bolt, which includes a
peripheral notch, is mounted in a receiver section adjacent the
trigger housing. A projection on the upper surface of the bolt stop
is adapted to be received in the notch to prevent axial movement of
the bolt. A surface of the projection forms an acute angle with the
upper surface of the bolt stop and is adapted to contact a parallel
surface of the notch so as to check the spring urged movement of
the bolt stop away from the notch. A serrated contour on the lower
exterior portion of the bolt stop generally conforms to the
adjacent exterior surface of the trigger housing when the bolt stop
is spring urged to its lower limit of axial travel away from the
notch. The bolt stop is manually pressed into the notch for
retention of the bolt and released from the notch by displacing the
bolt.
Inventors: |
Pekarek; Roger M. (West
Simsbury, CT) |
Assignee: |
Colt's Inc. (Hartford,
CT)
|
Family
ID: |
25309480 |
Appl.
No.: |
04/850,932 |
Filed: |
August 18, 1969 |
Current U.S.
Class: |
42/16 |
Current CPC
Class: |
F41A
3/48 (20130101) |
Current International
Class: |
F41A
3/48 (20060101); F41A 3/00 (20060101); F41c
011/06 (); F41c 011/00 () |
Field of
Search: |
;42/16.5F,16R,16.1A,16.15B |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Borchelt; Benjamin A.
Assistant Examiner: Jordan; C. T.
Claims
I claim:
1. In a firearm, the combination comprising, a bolt having a notch
and a bolt stop to engage said notch, a receiver section and a
trigger housing, said trigger housing partially defining said
receiver section, and said bolt being slideably mounted for axial
movement within said receiver section, a passage extending through
said trigger housing from an exterior portion thereof to said
receiver section, said bolt stop being slideable disposed in said
passage for movement therein between a first position and a second
position in which an exterior surface of said bolt stop is
substantially flush with said trigger housing, an angular
projection on said bolt stop to be received in said notch when said
bolt stop is in said first position, said notch and said projection
including respective cooperating surface means to prevent axial
movement of said bolt and sliding movement of said bolt stop when
said bolt stop is in said first position in firm engagement with
said bolt, and means to spring bias said bolt stop away from said
notch toward said second position, whereby a sufficient
displacement of said bolt will separate said surface means so as to
permit said spring bias means to urge said bolt stop to said second
position.
2. The combination of claim 1, wherein said bolt stop comprises a
vertical leg having a void therein and a horizontal leg, and
wherein said spring bias means comprises a pin projecting from a
wall of said passage to a position in which it is at least
partially contained within said void, and a spring interposed
between said pin and said horizontal leg.
3. The combination of claim 2, in which said exterior surface
comprises serrations.
Description
BACKGROUND OF THE INVENTION
The invention relates generally to autoloading bolt action-type
firearms, and more particularly to autoloading bolt action-type
firearms which include a means to lock the bolt thereof.
Previous bolt lock devices generally include locking arrangements
which impair the exterior contour and beauty of the firearms with
which they are associated. Two prior art combinations which
exemplify such devices are a bolt attached cocking handle which is
adapted to be inserted into a mating cut in the bolt receiver, and
a button in the cocking handle which is adapted to be positioned
into a mating aperture in the receiver. The cocking handle-type
locking device is attended with disadvantage in that the cut
thereof is susceptible to becoming entangled on a user's clothing
and is liable to have its finish removed by repeated insertion of
the handle therein. The button-type device not only has a tendency
to snag on a user's clothing, but also is likely to be rendered
inoperative should dirt become impacted in the aperture of the
receiver and mar the finish of the receiver.
SUMMARY OF THE INVENTION
The invention provides a novel means of locking a bolt in the
receiver section of a firearm which does not include structure
which protrudes from the exterior surface of the firearm and hence
does not detract from the exterior beauty of the firearm, and is
incapable of snaring in a user's clothing. Furthermore, a
bolt-locking apparatus in accordance with invention is not prone to
being rendered inoperative by dirt coming into contact with the
firearm.
A firearm with a bolt receiver and bolt therein has a trigger
housing with a passage therethrough slidingly receiving a spring
biased bolt lock, which is adapted to coact with a notch in the
bolt to restrain axial movement of the bolt in the receiver. The
exterior portion of the bolt lock generally conforms to the contour
of the firearm when the lock is in a position permitting free
sliding movement of the bolt. The bolt lock will automatically
return to this position from its locking position when the bolt is
displaced from its locked position.
It is accordingly a primary object of this invention to provide a
bolt lock which is disposed substantially within the contour of its
associated firearm.
It is another object to provide a bolt lock for a firearm which
will not snag on a user's clothing or be liable to be rendered
inoperative by dirt accumulation on the firearm.
It is a further object to provide a bolt lock for a firearm which
directly engages the bolt thereof.
These and other objects and advantages will become apparent from
the following detailed description when taken in connection with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary longitudinal view, partly in section, of a
firearm incorporating a preferred form of bolt lock according to
the invention.
FIG. 2 is an isometric view of the slideable bolt lock per se.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
FIG. 1 shows an autoloading lever action-type rifle incorporating
the bolt lock of the invention, the lever mechanism not being shown
as it forms no part of the invention. The rifle embodies a
substantially hollow bolt receiver section 2 which contains a bolt
4 which is axially slideable between its solid line position and
slightly to the right of the locked position shown in phantom. On
the upper portion of bolt 4 is a T-shaped recess for the provision
of a recoil spring assembly 6. A notch 8 is cut into the lower
peripheral surface of bolt 4 to receive the bolt stop for
preventing leftward movement of the bolt as will be more fully
explained hereinafter. Notch 8 comprises a transverse surface 10
which forms an acute angle with the lower peripheral surface of
bolt 4.
A trigger housing 12 serves to partially define the lower portion
of the receiver section 2 and incorporates a passage 14 which
passes through the trigger housing from an exterior portion of the
housing to the receiver section and has the general shape of a
truncated rectangular prism. Slideably contained for axial movement
in the passage 14 is a bolt stop generally designated at 16,
preferably made of a nylon composition sold under the trademark
Zytel.
As FIG. 2 shows, the extreme upper portion of the bolt stop
comprises an angular projection 18 which is defined by surface 20
and upper surfaces 22 and 24, surface 20 being parallel to surface
10.
Bolt stop 16 is generally L-shaped and comprises a void 26 in
vertical leg 28 through which is inserted a pin 30, pin 30 being
fixedly secured to and projecting from a wall of passage 14 in
trigger housing 12. Spring 32 is vertically interposed between pin
30 and the horizontal leg 34 of bolt stop 16 to spring bias the
bolt stop away from a first position in which the projection is
inserted in the notch 8 in bolt 4. The bolt stop 16 has serrations
36 formed on the lower exterior surface thereof to enable a user of
the rifle to sense the location of the bolt stop and to insure that
firm contact will be established between the user's fingers and the
stop when it is desired to upwardly displace the bolt stop into
locking engagement with notch 8 in the aforementioned first stop
position.
Referring again to FIG. 1, it is apparent that when the bolt stop
16 is pushed upwardly from its illustrated second position, and the
surfaces 20 and 10 overlap one another in cooperating firm
engagement, as is produced by the interaction of the bias of the
bolt's recoil spring assembly 6 and the bias of spring 32, leftward
axial movement of bolt 4 and downward sliding movement of bolt stop
16 are prevented.
The serrations 36 of bolt stop form an exterior surface which is
substantially flush with the trigger housing so that the continuity
of the contour thereof is generally unimpaired by the bolt stop
when it is in the second position.
In operation, the bolt stop 16 is upwardly displaced from the
second position, illustrated in FIG. 1, subsequent to the bolt 4
being positioned just slightly to the right of the phantom position
of FIG. 1 so as to permit the extreme upper surface 22 of the bolt
stop to freely pass into the notch 8. When surface 22 establishes
contact with the interior portion of the notch, the bolt 4 is
released to thereby cause the cooperating surfaces 10 and 20 to
abut and overlie one another. Movement of either the bolt 4 or the
bolt lock 16 is now checked. In order to release the bolt lock 16
from its engagement in notch 8, it is only necessary to move the
bolt 4 to the rear so as to allow the projection 18 to clear the
surface 10. The bolt lock 16 will then automatically snap back to
the second position (i.e. the original position) under the bias of
spring 32.
The term "notch," as used in the specification and claims, is
intended to embrace other voids, such as apertures, bores,
cavities, grooves, slits, slots, etc. The term "trigger housing" is
intended to include the firearm structure lying below the
receiver.
Obviously many variations and modifications of the invention are
possible in light of the above teachings without departing from the
scope or spirit of the invention.
* * * * *