U.S. patent number 3,882,622 [Application Number 05/379,811] was granted by the patent office on 1975-05-13 for locking means for firearms.
Invention is credited to George T. Perlotto.
United States Patent |
3,882,622 |
Perlotto |
May 13, 1975 |
Locking means for firearms
Abstract
A locking means for firearms operable by means of a key operated
cam. The purpose being that only the person holding the proper key
to the firearm can release the safety lever from its locking
position.
Inventors: |
Perlotto; George T. (St. Clair
Shores, MI) |
Family
ID: |
23498794 |
Appl.
No.: |
05/379,811 |
Filed: |
July 16, 1973 |
Current U.S.
Class: |
42/70.11 |
Current CPC
Class: |
F41A
17/02 (20130101) |
Current International
Class: |
F41A
17/00 (20060101); F41A 17/02 (20060101); F41c
017/08 () |
Field of
Search: |
;42/1LP |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Borchelt; Benjamin A.
Assistant Examiner: Jordan; C. T.
Claims
I claim:
1. A locking mechanism for a firearm comprising a safety lever,
means for locking said safety lever with a key operable lock, a
locking cam having a cam surface, a proper key to rotate said lock
and locking cam, a locking plunger whereby movement of the locking
cam moves said locking plunger releasing said safety lever, said
locking cam having a key operable lock at one end whereby said
locking cam is rotated when the proper key is inserted and
turned.
2. The invention as described in claim 1 in which said locking cam
includes a flat cam surface portion and a curved cam surface
portion.
3. A locking mechanism as set forth in claim 1 wherein said locking
plunger includes a locking plunger pin and spring, said spring
biasing the locking plunger pin against said cam surface
portions.
4. A locking mechanism as set forth in claim 1 wherein said safety
lever includes a shaft extending from said safety lever, the end of
said shaft including a flat semi-circular shoulder surface portion
abutting one end of the locking cam, said semicircular shoulder
surface portion having a recess portion extending radially whereby
said locking plunger is adapted to move in said recess portion of
said shoulder surface portion to prevent rotation of said safety
lever, thus locking the firearm.
Description
SUMMARY OF THE INVENTION
The invention relates to a means for locking a firearm by means of
a key. The purpose being that the person with the proper key could
release the "safety position" of the firearm, or lock the firearm,
thus preventing accidental shooting of the firearm.
FIG. 1 shows thhe upper handle and hammer end of an automatic
pistol.
FIG. 2 shows a partly cross-sectional view of the locking plunger
pin and spring.
FIG. 3 shows a cross-sectional view of the locking plunger pin in
contact with the locking plunger cam in locking position.
FIG. 4 shows a cross-sectional view of the locking plunger pin in
contact with the locking plunger cam in an unlocking position.
FIG. 5 is a top cross-sectional view of FIG. 4 showing the locking
plunger pin in an unlocking position.
FIG. 6 is a top cross-sectional view of FIG. 3 showing the locking
plunger pin in a locking position.
FIG. 7 is a perspective view of the locking cam.
FIG. 8 is a perspective view of the safety lever trunnion.
DETAILED DESCRIPTION
FIG. 1 shows perspective view of the rear upper handle end of an
automatic pistol 2. A key 4 is shown inserted into the locking
means 6 which controls the rotational movement of a locking cam 10,
shown in FIG. 7, allowing the locking plunger 12, shown in FIG. 2,
FIG. 3, FIG. 4, FIG. 5, and FIG. 6 to be moved in locking recess 14
of half-circular shoulder portion 16 of shaft 18 of safety lever
20.
As shown in FIG. 2, the locking plunger pin 12 is slidable within a
bore 13 and held against the locking cam 10 and semi-circular
shoulder portion 16 by spring 22. A threaded plug 24 is inserted in
the bore to allow removal, however, it is to be understood that
other permanent plug means can be inserted as a plug to prevent
withdrawal of the locking plunger pin. It is to be further
understood that a square bore instead of a round bore and a square
pin instead of a round pin is adaptable to this device.
While FIG. 7 shows the locking cam 10 and FIG. 5 and FIG. 6 shows
the locking cam 10 in its un-locked position and locked position,
respectively. The locking cam 10 consists of a segmented quarter
section 32 which is rotated ninety degrees as shown in FIG. 5 and
FIG. 6. It includes a surface portion 49 which abuts the
semi-circular surface portion 51 of shaft 18 of safety lever means.
The cam 10 includes a flat edge 34 on surface portion 50 which is
parallel to flat-sided extension 36. Extension 36 is a lock
contacted by key 4 and turned by the sides of the key from a locked
position to an un-locked position and vice-versa. The quarter
section 32 is adapted to move within the recess 52 depending on
whether the safety lever of the pistol is to be locked or
un-locked. The cam 10 is placed in position when a bore 40 is
drilled in the slide 42 and either press-fitted in position or
secured by other conventional means, e.g. brazing, welding or
soldering at shaft portion 44. A retaining cap 46 is secured to the
slide 42 by conventional means, and includes a bore 48 which allows
entry of key 4 to turn cam 10 to lock or un-lock the safety
lever.
In operation, viewing FIG. 3 and FIG. 6, shows the locking plunger
pin 12 against edge 34 of locking cam 10, allowing plunger pin 12
to fit into locking recess 14, thereby preventing the safety lever
20 to be removed from the "safety position" of the firearm as shown
in FIG. 2.
To unlock the safety lever, key 4 is inserted into retaining cap 46
and connected to extension 36 of locking cam 10, and rotated
90.degree., thus moving locking cam 10 90.degree., thereby allowing
position of segmented quarter section 32 to move 90.degree. as
shown in FIG. 4 and FIG. 5. Movement of locking cam 10 moves the
flat edge 34 90.degree., thus allowing the circumferential surface
portion 50 of cam 10 to move the locking plunger pin 12 to move
back out of the locking recess 14 of shaft 18 of safety lever 20.
As shown in FIG. 5, with the locking plunger pin 12 out of position
of preventing rotation of safety lever shaft 18, safety lever 20
can be partially turned or partially rotated to release the "safety
lever" from its locked position to its un-locked position.
The firearm can now be fired.
While it will be apparent that the embodiment of the invention
herein disclosed is well calculated to fulfill the objects above
stated, it will be appreciated that the invention is not
necessarily limited to pistols, but could be adapted to revolvers,
rifles, shot guns and other firearms; and further susceptible to
modification, variation and change.
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