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Патент USA US2404881

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July 30, 1946.
|_. H. MOCLURE, JR
SEAR RELEASE MECHANISM
Filed Jan. 26, 1944
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2,404,881
Patented July 30, 1946
2,404,881
UNITED STATES PATENT OFFICE
2,404,881
SEAR RELEASE MECHANISM
Laurence H. McClure. Jn, West Hartford, Conn.,
assignor to Colt’s Patent Fire Arms Manufac
turing Company, Hartford, Conn, a. corpora
tion of Connecticut
1
Application January 26, 1944, Serial No. 519,702
9 Claims. (01. 89-—27)
The present invention broadly relates to the
combination of an automatic ?rearm having a
breech casing provided On opposite sides with
means adapted to support a trigger motor on one
2
or the other of the breech casing due to the sur
roundings of the ?rearm. In order that the use
of the ?rearms may be rendered more flexibly
side or the other of the breech casing, a breech C1 adaptable to various mounting conditions, they
are constructed so that the trigger motors may
bolt reciprocable within the breech casing, a ?r
be mounted on either side of the breech casing.
ing pin reciprocable within said breech bolt, a
scar slidably mounted adjacent one end of the
breech bolt, a scar slide guideway adjacent and
extending transversely to said scar, and a sear
slide assembly comprising a pair of members re
spectively mounted within said sear slide guide
way, each of said members embodying a cam
For the trigger motor to coact with the sear slide
in the breech bolt, it has heretofore been neces
sary that the outer end of the sear slide be dis
posed in the end of the sear slide guideway ad
jacent the side of the breech casing on which the
trigger motor was mounted. If the trigger motor
were changed from one side of the breech casing
to the other, it was necessary to partially disas
notch adapted to normally coincide with each
other and independently cooperate with one of 15
scmble the ?rearm to the extent of removing the
a plurality of cam surfaces on the sear to actu
back plate and render accessible the rear end
ate the same and release said ?ring pin which
of
the breech bolt, reverse the sear slide Within
is adapted to be held in cocked position by the
the sear slide guideway and then reassemble the
sear. Speci?cally, the essence of the present in
?rearm.
vention comprises the sear slide assembly which
Frequently ?rearms of the type referred to are
is adapted to be mounted in a conventional sear
mounted
in inaccessible positions in airplanes or
slide guideway of existing breech bolts for auto
on mounts of various kinds used elsewhere, the
matic ?rearms, whereby no alteration of any
?ring of the ?rearms 50 mounted being controlled
parts of said ?rearms or standard trigger motors
from
a position remote from the ?rearms. Re~
is required in order to utilize said sear slide as 25
garding remotely mounted ?rearms in airplanes
sembly in the foregoing combination of parts in
particularly, when an airplane is in ?ight, it is
an automatic ?rearm.
generally impossible for a gunner to have access
Heretoiore, it has been customary to utilize a
to the ?rearm for servicing or even for loading
single sear slide adapted to be slidably mounted
in a conventional sear slide guideway in a breech 3 0 the ?rearm. When the ?rearm mounted in a re
mote position in an airplane such as referred to
bolt, said sear slide extending inward from sub
stantially one end of said guideway to and slightly
is serviced While grounded, should the trigger
motor for any reason be changed from one side
past a cam faced member projecting from one
side of the sear into the sear slide guideway.
of the breech casing to the other without also
Said sear slide was provided with a cam surface :1‘ reversing the sear slide in its guideway, said omis
sion to reverse the sear slide will render that
extending inward from one edge of the slide, said
particular ?rearm useless when the airplane is in
?ight since the gunner, as stated, can usually not
reach the gun for purposes of reversing the sear
surface being adapted to coact with one of said
cam surfaces on the sear. When a trigger motor
was mounted on the side of the breech casing
adjacent the end of the guideway in which the
outer end of the sear slide was disposed, said trig
4:
gcr motor could be energized to move said sear
slide into camming engagement with the scar and
release the ?ring pin held in cocked position by
the sear.
Automatic ?rearms of the type to which the
present invention pertains are very commonly
used in airplanes as well as on many different
types of vehicle or stationary ground type
mounts. Said ?rearms are frequently mounted in
closely juxtaposed pairs, whereby it is necessary
to mount a trigger motor on one side of one ?re
arm and on the opposite side of the adjacent ?re
arm. Under certain conditions, it is necessary or
desirable to mount the trigger motor on one side
,9. LI
slide. Thus. a completely loaded ?rearm, under
these circumstances, would be of no use until the
airplane was subsequently grounded to permit
reversing the sear slide in its guideway.
The present invention has been conceived to
obviate the possibility of the occurrence of the
foregoing undesirable circumstances. Thus, one
object of the invention is to provide a scar slide
assembly
comprising
inter?tting
component
members respectively operable from either end of
the sear slide guidcway by a trigger motor when
mounted on either side of the breech casing,
whereby the trigger motor may be changed from
one side to the other of the breech casing and
no servicing of the ?rearm of any kind, such as
reversing the sear slide in its guideway, will be
required.
2,404,881
3
Another object of the invention is to construct
the component members of the sear slide assem
bly so that the overall dimensions of the assembly
will permit the substitution of the assembly for
the conventional single sear slide referred to in
the foregoing.
It is a still further object of the invention to so
4
The sear slide conventionally used at present
on ?rearms of the type illustrated is shown in
Fig. 4, said slide being of one piece construction
and reversing of said slide in its guideway is re
quired when a trigger motor is changed from be
ing mounted on one side of the breech casing to
being mounted on the other side of the breech
casing.
Referring to the drawing, the automatic ?re
construct the component parts of the sear slide
assembly that said assembly may be slidably
arm Ill comprises a breech casing ll having a
mounted in its guideway without requiring the 10 pair of spaced side plates 12 and 14 which are
disassembly of any of the component parts of the
respectively provided with means comprising
breech bolt; it merely being necessary to move
slots 16 and IB adapted to accommodate and sup
the rearward end of the breech bolt to a position
port a trigger motor 20 when mounted on either
slightly beyond the rearward end of the breech
plate I2 or M. Trigger motor 20 is of a conven
casing so as to expose the opposite ends of the l.) tional type and includes a reciprocable plunger
sear slide guideway.
22 adapted to extend into the slots IE or l8 of
Still another object of the invention is to pro
the side plates. When the trigger motor is ener
vide a cam surface on each component part of
gized, either electrically or mechanically, plunger
the assembly so that said cam surfaces will be
22 is caused to move through the slots 16 or l8
10
adapted to independently coact with the conven
and into the interior of the breech casing H.
tional earn surfaces on the sear, whereby the con
Longitudinally reciprocable within the breech
struction of the standard sear will not have to be
casing II is a breech bolt 24 which slidably sup
modi?ed in any way in order to utilize said sear
ports a reciprocable ?ring pin 26 which is biased
slide assembly.
The details of the foregoing objects, as well as
other objects and the details of the invention, ap
pear in the following speci?cation and are illus
from cocked to ?ring position by a spring 28.
The rearward end of the firing pin is provided
with a dog or detent 36.
A cocking lever 32 is
,pivotally movable about a transverse axis 34 and
trated in the accompanying drawing.
engages the rearward end of the ?ring pin 26 to
The accompanying drawing shows the embodi
move the same rearward to cocked position.
ment of the invention which is deemed preferable, 30 Cooking lever 32 is actuated by a mechanism in
but it will be understood that the drawing is in
tended for illustrative purposes only and is not
to be construed as de?ning or limiting the scope
of the invention, the claims forming a part of
the breech casing, details of which are fully de
this speci?cation being relied upon for that
purpose.
to accommodate opposed flanges 38 respectively
scribed in said Patent No. 1,628,226.
A pair of opposed vertical guideways 36 are
formed in the rearward end of the breech bolt
formed on opposite sides of a vertically movable
sear 45) which is normally biased upward by a
Fig. 1 is a vertically sectioned fragmentary side
spring 42. The inner side of the sear 4B is pro
elevation of the rearward end of a, breech bolt in
vided with a protruding catch 44 adapted to en
40
cluding the sear slide assembly comprising the
gage the detent 3B of the ?ring pin to hold the
present invention.
latter in cocked position after the same has been
In the drawing,
'
Fig. 2 is a fragmentary rear end view of an
moved to said position by the cooking lever 32.
automatic ?rearm embodying the present inven
The rearward face of the sear 46 is provided
tlon, part of the ?rearm being diagrammatically
with a rearward extending projection 46 which is
illustrated in dot and dash lines and another part , ; provided on its upper portion with a pair of op
of the ?rearm being transversely and vertically
posed cam faces 43 and 50.
sectioned to better illustrate the details of the
The rearward end of the breech bolt is also
present invention. In this view, a trigger motor
provided with a horizontal guideway 52 compris
is shown in its alternate positions on opposite
ing opposed channels, the bottom channel inter
sides of the breech casing.
secting the projection 46.
Fig. 3 is an exploded perspective detail view of
The sear 40 normally reciprocates vertically in
the sear slide assembly comprising the essence
a path su?lciently long to permit the catch 44
of the present invention.
to disengage the detent 30 in order to release the
Fig. 4 is a perspective view of a single con—
- firing pin. Further downward movement of the
ventional sear slide.
The type of automatic ?rearm to which the
present invention preferably, but not restrictive
ly, applies is basically illustrated in U. S. Patent
No. 1,628,226 to Browning. In said patent, a ver
tically movable sear is actuated by a trigger lever
and no sear slide is illustrated.
However, a
?rearm utilizing a vertically slidable sear and a
horizontally slidable sear slide is shown, for ex
ample, in U. S. Patent No. 1,618,280. The sear
slide in the latter patent is reversible in order
to permit the mounting of a trigger motor on one
side or the other of the breech casing.
Horizontally slidable scars and vertically slid
able sear slides are illustrated in U. S. Patents
Nos. 1,803,349 and 1,803,350, respectively, issued
to Pfeiffer and Tansley. In the latter two pat
ents, the sear slides are reversible in order to
render the sears releasable by a trigger motor
when said motor is mounted on either side of
the breech casing.
.sear is unnecessary but a slight amount of fur
ther downward movement is possible to insure
releasing of the detent 39 under all circum
stances. Downward movement of the sear 40 is
limited by spring 42 becoming completely com
pressed.
Heretofore, in conventional breech bolts, 5:, sear
slide 54 was slidably mounted in guideway 52 and
was provided on each of its top and bottom edges
with a guide rib 56 respectively accommodated in
the opposed channels of said guldeway. A cam
notch 58 extended upward from the bottom edge
of the slide and said bottom edge was cut away
between the cam notch 58 and the inclined inner
end 80 to provide a clearance space for purposes
to be described. The inclined end 69 engaged
one of the cam faces 48 or 50 of the sear, when
the slide 54 was introduced into the guideway
from one end or the other thereof, and cammed
the sear downward, the clearance space at ‘the
2,404,881
lower edge of the slide being adapted to pass or
clear the projection 46 of the sear in order that
the cam faces 48 and 50 thereof might be dis
posed against the walls of the notch 58 of the
slide. The inner end of the slide terminated a
substantial distance from the end of the guide
way opposite that from which the slide was in
troduced. Movement of the sear downward was
6
inner ends 01' the members may be introduced
within the guideway 52 until they reach their 01:
erative position and the projection 46 is disposed
within the notches ‘l4 and 16. The purpose of
the reduction in width of the inner end of the
members 62 and 64 is the same as that with re
gard to sear slide 54. It will be noted that the
longer faces of notches ‘i4 and 18 comprise the
sufficiently limited that the sear slide could not
active cam faces of said notches and the major
be mounted in the guideway in the manner de 10 portion of each of said active cam faces is not
scribed unless said clearance space was provided
narrowed, whereby no undue wearing of said
on the sear slide.
If a trigger motor 20 were mounted, for ex
ample, on the left side plate of the breech casing,
the sear slide 54 was mounted with its larger or 15
outer end adjacent the plunger 22 of the trigger
motor whereby, when the plunger was actuated,
faces will result, notwithstanding the reduction
of the thickness of the inner ends of members
82 and 64 to form recesses 66 and 68.
The outer or larger end of each of members
62 and 84 respectively normally extends within
the guideway 52 to a position adjacent the op
posite ends of the guideway, whereby said outer
ends of said members are substantially ?ush with
the sear slide was moved inward and the longer
wall of the notch 58 engaged the cam face 48 to
depress the sear and release the ?ring pin from 20 the opposed sides of the breech bolt 24.
cocked position. When the trigger motor plunger
The members 52 and 64 are respectively slid
disengaged the sear slide, spring 42 biased the
ably guided within the guideway 52 by means of
sear upward and moved the sear slide outward
opposed ribs 18 and 80 formed respectively on
to its normal starting position.
the upper and lower edges of said members. The
However, when a trigger motor is changed
ribs 18 and 80 are received within the channels
from the left side of the breech casing to the
formed in the upper and lower walls of the guide
right side thereof, it is necessary, when using a
way 52. The upper ribs 18 and 80 of said mem
conventional sear slide 54, to disassemble the ?re
bers are reduced in width for the greater portion
arm suf?ciently to expose the rearward end of
of their length but, when the members are
the breech bolt the necessary amount to permit 30 mounted in assembled relationship, the juxta
access to the guideway 52 in order that the sear
posed portions of said upper ribs which are re
slide 54 may be removed from the left hand end
duced in width supplement each other to provide
of the guideway and reinserted in the right hand
properly guided slidable movement for the upper
end in order that the outer end of the slide may
edges of either of said members when moved in
be in proper position to be engaged by the plunger
of the trigger motor when mounted on the right
hand side of the breech casing.
As stated in the foregoing, if a ?rearm of the
type described is mounted in an inaccessible loca
dependently of the other member.
It will thus be seen that the sear slide assembly
comprising the essence of the present invention,
when mounted in combination with the otherwise
conventional cooperating and interconnected
tion, for example, in an airplane or elsewhere
parts of the ?rearm, will serve to actuate the sear
and the ?ring of the ?rearm is remotely con
to release the ?ring pin from cocked position,
trolled, the ?rearm will be useless following a
whether the trigger motor is mounted on the
changing of the trigger motor from one side of
right side or the left side of the breech casing
the breech casing to the other unless the sear
and without requiring a reversal of any parts of
slide has also been reversed within its guideway. 45 the sear slide assembly or any dismounting or
To overcome the necessity of having to reverse
changing of the parts of the ?rearm. Thus.
the sear slide in a conventional ?rearm of the
should the trigger motor be changed from one
type described each time the trigger motor is
side to the other of the breech casing, it will no
changed from one side to the other of the breech
longer be necessary to service the ?rearm to the
casing, the essence of the present invention. com 50 extent of reversing a sear slide as has previously
prising a sea-r slide assembly, may be substituted
been necessary and is still required with’ respect
for the conventional sear slide inasmuch as the
to ?rearms having conventional sear slides of
overall dimensions of said assembly are such that
the type illustrated in Fig. 4. Therefore, when
it is readily accommodated in the sear slide guide
said above-described sear slide assembly is sub
way of a conventional breech bolt.
55 stituted for a conventional sear slide, no loss of
Referring to Figs. 1 through 3, and particularly
use of a ?rearm will be experienced relatively to
to Fig. 3, the sear slide assembly comprises a pair
?rearms which are inaccessibly mounted during
of inter?tting members 62 and 64 which are in
combat as was previously the situation when a
dependently slidably mounted within the guide
sear slide was inadvertently not reversed in its
way 52. Said members are each reduced in thick 60 guideway after the trigger motor had been
ness partially of their length to respectively form
changed from one side to the other of the breech
complemental recesses 66 and B8 in said mem
casing. The sear slide assembly comprising the
bers. These recesses respectively slidably accom~
present invention may be substituted for the con
modate the inner end of the other member. Said
ventional single sear slides presently in use in
inner ends of said members are also respectively 65 large numbers without modifying either the ?re
provided with inclined faces 10 and 12 which
arms or trigger motors in any Way.
function similarly to the inclined face 60 of the
During the operation of said sear slide assem
conventional sear 54.
bly, when one of the members 62 or 54 is moved
Members 62 and B4 are also respectively pro
inward to depress the sear and release the ?ring
vided with cam notches ‘I4 and 16 each having a 70 pin, the other member will be prevented from
face engageable with one of the opposed cam
moving outward of the guideway through the ad
faces 48 and 50 of the sear projection 46. The
jacent slot in the side plate inasmuch as the lower
inner ends of the members 62 and 64 are reduced
edge of the outer end of both of said members
in width between the inclined faces ‘HI and ‘I2
is respectively below the lower wall of each of
and the notches ‘l4 and 76 in order that said 75 slots l6 or la in said side plates.
2,404,881
‘Terms used to indicate position, direction and
location such as rearward, forward, upper, lower,
left hand side, right hand side, and the like are
to be considered when the ?rearm is mounted in
its normal position which is that shown in the
drawing when the sheet containing the same is
held in a vertical position and the left hand end
of Fig. 1 is considered the rearward end of the
breech bolt and Fig. 2 is considered to be a verti
8
opposite ends thereof, each member having a cam
face intermediately of its ends engageable with
one of the cam faces of said sear for effecting fir
ing pin releasing movement of the sear when
either of said members is actuated, the inner ends
of said members overlapping within said guide
way and the outer end of each of said members
being respectively engageable by a trigger motor
to actuate said sear when said motor is mounted
10 on the side of the breech casing adjacent the re
cal rear elevation of the ?rearm. Said terms are
spective outer end.
to be considered in the same relative sense re
3. An automatic ?rearm having a breech cas
gardless of the position in which the ?rearm may
ing
provided with similar means at opposite sides
be ultimately disposed.
thereof each adapted for the attachment of a
While the invention has been illustrated and
trigger motor, a breech bolt within the casing
described in its preferred embodiment and has
and reciprocable upon recoil from and to ?ring
included certain details, it should be understood
position, a spring actuated ?ring pin movable
that the invention is not to be limited to the
longitudinally of the breech bolt and provided
precise details herein illustrated and described
since the same may be carried out in other ways,
falling within the scope of the invention as ‘
claimed.
What I claim is:
1. An automatic firearm having a breech cas
ing provided with similar means at opposite sides
thereof each adapted for the attachment of a
trigger motor, a breech bolt within the casing and
with a sear engaging shoulder, a scar recipro
cably carried by the breech bolt and provided
with a latch engageable with said shoulder on
said ?ring pin to hold said pin in cocked position
and said sear also being provided with a pair of
opposed cam faces, said breech bolt also having
a guideway adjacent said scar and extending
transversely to the path of movement of said sear,
in combination with sear operating mechanism
reciprocable upon recoil from and to ?ring posi
constructed and arranged to permit the same to
tion, a spring actuated ?ring pin movable longi
be slidably mounted in said guideway while said
tudinaliy of the breech‘ bolt and provided with a
sear engaging shoulder, a scar reciprocably car 30 sear remains in operative position in the breech
bolt, said mechanism comprising in combination,
ried ‘::;y the breech bolt and provided with a latch
a pair of members individually guidably mount
engageabie with said shoulder on said ?ring pin
ed in said guideway and respectively extending
to hold said pin in cocked position and said sear
inward from opposite ends thereof, each mem
also being provided with a pair of opposed cam
faces, said breech bolt also having a guideway ad 35 ber having a cam face intermediately of its ends
engageable with one of the cam faces of said
jacent said scar and extending transversely to
sear for effecting ?ring pin releasing movement
the path of movement of said sear, in combina
of the sear when either of said members is ac
tion with sear operating mechanism constructed
tuated, the inner ends of said members overlap
and arranged to permit the same to be slidably
ping and being respectively complementally re
mounted in said guideway while said sear remains cessed on their juxtaposed surfaces to accommo
in operative position in the breech bolt, said
date a portion of the other member and the outer
mechanism comprising in combination, a pair of
end of each of said members being respectively
members individually guidably mounted in said
engageable by a trigger motor to actuate said sear
guideway and respectively extending inward from
when said motor is mounted on the side of the
opposite ends thereof, each member having a
breech casing adjacent the respective outer end
cam face engageable with one of the cam faces
4. An automatic ?rearm having a breech cas
of said sear for effecting ?ring pin releasing
ing provided with similar means at opposite sides
movement of the sear when either of said mem
thereof each adapted for the attachment of a
bers is actuated, and the outer end of each of
trigger motor, a breech bolt within the casing
said members being respectively engageable by a
and reciprocable upon recoil from and to ?ring
trigger motor to actuate said sear when said mo
position, a spring actuated ?ring pin movable
tor is mounted on the side of the breech casing
longitudinally of the breech bolt and provided
adjacent the respective outer end.
2. An automatic ?rearm having a breech cas
with a sear engaging shoulder, a sear recipro
cably carried by the breech bolt and provided
ing provided with similar means at opposite sides
with a latch engageable with said shoulder on
thereof each adapted for the attachment of a
said ?ring pin to hold said pin in cocked posi
trigger motor, a breech bolt within the casing and
tion and said sear also being provided with a pair
reciprocable upon recoil from and to ?ring posi
of opposed cam faces, said breech bolt also hav
tion, a spring actuated ?ring pin movable longi
ing a guideway adjacent said scar and extending
tudinally of the breech bolt and provided with a 60 transversely to the path of movement of said
sear engaging shoulder, a scar reciprocably car
sear, in combination with sear operating mech
ried by the breech bolt and provided with a latch
anism constructed and arranged to permit the
engageable with said shoulder on said ?ring pin
same to be slidably mounted in said guideway
to hold said pin in cocked position and said sear
also being provided with a pair of opposed cam 65 while said sear remains in operative position in
the breech bolt, said mechanism comprising in
faces, said breech bolt also having a guideway
combination, a pair of members individually
adjacent said scar and extending transversely to
guidably mounted in said guideway and respec~
the path of movement of said sear, in combina
tively extending inward from opposite ends
tion with sear operating mechanism constructed
thereof, the inner ends of said members overlap
and arranged to permit the same to be slidably 70 ping
and said overlapping ends being respectively
mounted in said guideway while said sear remains
complementally reduced in thickness to provide
in operative position in the breech bolt, said
a recess to accommodate the inner end of the
mechanism comprising in combination, a pair of
other
member, each member also having a cam
members individually guidably mounted in said
notch extending inward from one edge of its
guideway and respectively extending inward from
9
2,404,881
10
reduced portion and the Walls of each notch be
cam surface formed on the overlapping portion
ing engageable with a cam face of said sear for
thereof and arranged to be moved independently
effecting ?ring pin releasing movement of the
of each other to coact with and actuate a sear
sear when either of said members is actuated,
the outer end of each of said members being
respectively engageable by a trigger motor to ac
tuate said sear when said motor is mounted on
the side of the breech casing adjacent the re
spective outer end.
5. An automatic ?rearm having a breech cas
ing provided with similar means at opposite sides
thereof each adapted for the attachment of a
trigger motor, a breech bolt within the casing
and reciprocable upon recoil from and to ?ring
position, a spring actuated ?ring pin movable
longitudinally of the breech bolt and provided
with a sear engaging shoulder, a sear recipro
cably carried by the breech bolt and provided
with a latch engageable with said shoulder on
said ?ring pin to hold said pin in cocked posi
tion and said sear also being provided with a pair
of opposed cam faces, said breech bolt also hav~
ing a guideway adjacent said scar and extending
transversely to the path of movement of said
when operatively assembled in the sear slide
guideway.
7. A sear slide assembly operable from either
side of a ?rearm and constructed for use in a
conventional sear slide guideway in a breech bolt,
said assembly comprising in combination, a pair
of elongated members constructed and arranged
to overlap for a portion of their length and each
provided with a complemental recess longer than
and accommodating the overlapping portion of
the other member, said members each having a
cam notch extending inward from one edge of
the overlapping portions thereof and said notches
normally coinciding and arranged to be moved
independently of each other to coact with and
actuate a scar when operatively assembled in the
20 sear slide guideway.
8. A sear slide assembly operable from either
side of a ?rearm and constructed for use in a
conventional sear slide guideway in a breech bolt,
sear, in combination with sear operating mech- ~
anism constructed and arranged to permit the
same to ‘be slidably mounted in said guideway
while said sear remains in operative position in
the breech bolt, said mechanism comprising in
combination, a pair of members individually gui - 30
ably mounted in said guideway and respectively
extending inward from opposite ends thereof,
the inner ends of said member overlapping and
said overlapping ends being respectively com
plementally reduced in thickness to provide a '
recess to accommodate the inner end of the other
member, each member also having a cam notch
extending inward from one edge of its reduced
portion and the walls of each notch being en
gageable with a cam face of said sear for effect
ing ?ring pin releasing movement of the sear
when either of said members is actuated, the
inner end of each of said members being reduced
said assembly comprising in combination, a pair
of elongated members each formed with longi
tudinally extending guide means on opposed
edges cooperable with means in said guideway and
said members being constructed and arranged to
overlap longitudinally for a portion of their length
and each member also being provided with a
complemental recess longer than and accommo
dating the overlapping portion of the other mem
ber, said members each additionally having a
cam notch extending inward from one edge of
the overlapping portions thereof and said notches
normally coinciding and arranged to be moved
independently of each other to coact with and
actuate a sear.
9. A sear slide assembly operable from either
40 side of a ?rearm and constructed for use in a
conventional sear slide guideway in a breech bolt,
said assembly comprising in combination, a pair
of elongated members constructed and arranged
in width between said end and the cam notch
to provide a space to clear said cam faces of said i I to overlap longitudinally for a portion of their
length and each provided with a complemental
recess
longer than and accommodating the over
bers in or from said guideway and the outer
lapping portion of the other member, said mem
end of one of said members being respectively
bers each having a cam notch extending inward
engageable by a trigger motor to actuate said
sear when said motor is mounted on the side of 50 from one edge of the overlapping portions thereof
and said notches normally coinciding and ar
the breech casing adjacent the respective outer
sear during insertion or removal of said mem
end.
6. A sear slide assembly operable from either
side of a ?rearm and constructed for use in a
conventional sear slide guideway in a breech bolt, ,
said assembly comprising in combination, a pair
of elongated members constructed and arranged
to overlap for a portion of their length and each
provided with a complemental recess longer than
ranged to be moved independently of each other
to coact with and actuate a sear when said mem
bers are operatively assembled in the sear slide
guideway, the overlapping portion of each mem
ber also being reduced in width between its notch
and overlapping end to facilitate the introduction
of each member into coacting relationship with
a sear incident to mounting said members in the
sear slide guideway.
and accommodating the overlapping portion of
the other member, said members each having a 60
LAURENCE H. MCCLURE, Jn.
Certi?cate of Correction
Patent No. 2,404,881.
July 30, 1946.
LAURENCE H. McCLURE, JR.
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent re uiring correction as follows: Column 10, line 38, claim 8, after
the word “sear” an before the period insert when operatz'oely assembled in the sear
slide guideway; and that the said Letters Patent should be read with this correction
therein that the same may conform to the record of the casein the Patent O?‘ice.
Signed and sealed this 22nd day of October, A. D. 1946.
[mm]
LESLIE FRAZER,
First Assistant Oonmz'asimer of Patents.
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