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Патент USA US2405798

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Aug“ 13, 1946;;
2,405,798
J. G. SEITZ
FIRING MECHANISM
Original Filed Nov. 28, 1939
INVENTOR.
155/1 6. 55/12
BY
, M’ MK,‘
2,405,798
Patented Aug. 13, 1946
UNITED STATES PATENT OFFICE
2,405,798
FIRING MECHANISM
John G. Seitz, San Francisco, Calif., assignor to
Samuel I. Keene, San Francisco, Calif.
Original application November 28, 1939, Serial No.
306,481. 7 Divided andrthis application May 6,
1944, Serial No. 534,393
1 Claim.
1
This invention relates to improvements in the
?ring mechanism of ?rearms, and is a division
of application, Serial No. 306,481, ?led November
28, 1939, now Patent No. 2,350,833,. dated June
6, 1944.
One of the objects of the invention is the pro
vision of improved means for causing the actu
ation of the ?ring mechanism for ?ring the piece,
(Cl. 42-69)
2
or release of the cocking piece, occurs at a point
during the release of the trigger after a retrac
tion thereof.
The “compression type” trigger
mechanism is the opposite type in which the re—
lease of the cocking piece occurs during retrac
tion of the trigger. This latter type is the one
most commonly used at the present time;
The advantages of a ?ring mechanism in which
and which piece may be in any one of the small
the ?ring is e?ected by release of the trigger
arms, such as the pistol, revolver, ri?e, or shot 10 rather than during retraction thereof are many,
gun, wherein the ?ring of the piece is e?ected
among which are (1) elimination of nerve strain
through a ?nger operated trigger.
Another object of the invention is the pro~
vision of improved means associated with the
heretofore present where-sighting and positive
release of the trigger will effect a ?ring of the
so that the operator will be relieved of any tense
pressure and tightening of the muscles are re
quired simultaneously, (2) the elimination of rel
?nger actuated trigger of a ?rearm for indicat 15 atively long and arduous training required by
ing to the user the exact moment at which the
novices for gaining a relatively high degree of
?ring mechanism will be actuated for ?ring the
accuracy in shooting, (3) elimination of the
cartridge during a movement of the trigger in one
tendency to draw the sighted ?rearm oif the tar
direction and after a greater movement has taken
get at the time of ?ring. All of the above elimi
place in such direction than in trigger mecha‘ 20 nated disadvantages directly contribute to better
nisms of the so-called hair-trigger type.
and faster shooting. However where the trigger
A still further object of the invention is the
mechanism is of the trigger release type it is also
provision of improved, safe means operatively
desirous that the operator have an indication of
associated with the ?nger actuated trigger of a
the exact point during release of the trigger at
?rearm of the type in which the ?ring mecha
which the ?ring mechanism will be actuated, and
nism is actuated for ?ring the cartridge during
this actuation should not come at the moment
the release of the trigger under the in?uence of
when the fully retracted trigger starts its return
a spring but checked by the trigger ?nger of the
movement under the power of the spring that is
operator for indicating to the user the exact
compressed during retraction. A slight amount
moment at which an extremely slight further 30 of “play” or movement should ?rst be permitted
cartridge.
ness in holding the trigger retracted. If this
Other objects and advantages will appear in
movement were not permitted it would be likely
the speci?cation and drawing annexed hereto.
that the operator would exert far more strength
In the drawing,
03 Cl than would be necessary to safely hold the trig
Fig. 1 is an enlarged fragmentary side view of
ger in retracted position, and would develop an
a ri?e at the breech, partially broken away and
undesirable nervous tension through fear of acci
partially in section, showing an example of my
dental release and consequent ?ring of the piece.
invention in which the cooking piece is cocked
The invention herein provides for a substan
but in which the trigger and ?ring mechanism 40 tial and abrupt resistance to the release of the
is inoperative for ?ring the piece although the
trigger under release of the pressure therein by
the trigger ?nger. Upon encountering this re
former may be retracted and fully released to
travel through its full stroke.
sistance (when the release of the trigger is under
control of the trigger ?nger during its release)
Fig. 2 is a view similar to that of Fig. 1, but
in which the ?ring mechanism is operative for
the trigger movement will stop until a still fur
?ring the piece at a point during the release of
ther release of the pressure by the trigger ?nger
the trigger after a full retraction thereof.
permits it to move past said resistance. This
Fig. 3 is an enlarged fragmentary View of a
further movement is very slight so that the trig
portion of the ?ring mechanism that is particu
ger virtually becomes a “hair trigger” once the
larly adapted to accomplish the objects of the 50 said resistance is encountered. It is to be noted
invention.
that during all this release of the trigger the
In describing the particular type of ?ring
latter is being moved by the power stored in the
mechanism herein, the term “trigger release”
spring during retraction of the trigger and the
will be used, and which term designates the type
force applied to the trigger by the trigger ?nger
in which the actuation of the ?ring mechanism 55 is a progressively reduced force rather than a
2,405,798
4
3
force of the trigger ?nger is relieved, as will later
be explained more in detail.
The lower end of trigger 3 extends downwardly
into the area enclosed by the guard bow H, as
In detail, the invention as illustrated in the
drawing is applied to the conventional 1903 Cl is conventional in most ?rearms.
Below the sear l is a horizontally elongated
model Spring?eld rifle that is provided with a
positive and progressively increasing force as is
the case where the compression type trigger
mechanism is employed.
stock having a pistol grip I, cocking piece 2,
trigger 3, bolt 4, and the usual barrel, etc. The
cocking piece 2 is provided with the ordinary
bar l8 that is pivoted at its forward end to trig- '
ger 3 by a horizontal pivot 19. The upper side
sear ‘l for holding the cooking piece 2 cooked
which recess is an elongated element 20 secured to
or drawn back under the expansive force of the
said bar at its forward end by a pivot 2|.
usual main spring (not shown). When the sear
rear end of said element is formed with an up
of said bar is formed with an upwardly opening
sear notch 5 for engaging a sear nose 6 on a= 10 recess extending longitudinally of the bar, in
The
wardly extending projection 22 that provides
nose is withdrawn from engagement in the sear
notch the cooking piece and conventional striker 15 a forwardly facing shoulder 23 or notch at the
forward side of said projection. The rear end
(not shown) are released to cause the striker or
ofv said element is yieldably supported in a posi
?ring pin to strike the percussion cap of the
tion slightly elevated above bar [8 on a spring
cartridge. The foregoing elements are old and
24 that is disposed between said element and
they, or their equivalents, are usually found ‘in
20 the bottom of the recess in which said element is
?rearms.
positioned (Fig-3).
‘
"In the following description the terms “for
Bar 18 is movable with triggerv 3. Thus upon 7
ward,” “rear,” and the like, are used with‘ref
retracting the trigger the bar l8 carrying ele
erence to the barrel. For example, the “forward”
ment 20 will move rearwardly and the bar and
end or portion of an element is the end or por
tion nearest the barrel, and the f'rear” end or 25 element will be carried forwardly by the trigger
when the latter'i's released. Spring I61 will‘ effect
portion of ‘an element is the end or portion re
such forward movement.
'
mote from the barrel, while the terms “rear
The lower side 25 of chamber‘ 8 carries the
wardly” and “forwardly” likewise are used with
guard bow i1, said side beingv commonly‘ called
reference to the said barrel. All of the'elements
a guard plate. Said plate extends rearwardly
hereinafter described are‘ disposed rearwardly of
of the guard bow at 26, and rear guard screw 21
the barrel and substantially below the bolt.
secures said extension 26 to the stock‘ in the‘ usual
The sear nose 6 is rigid on sear 1, the latter
manner.
being an elongated bar extending horizontally
At about the juncture of the rearv side'of guard
as seen in Figs. 1, ‘2 with the nose 6 positioned
bow I‘! with extension 26, the guard plate is
at a point intermediate its ends and projecting
formed with a, slot 28. Said slot opens down
thereabove. Sear 1 is disposed below the ?ring
wardly' and outwardly‘ at about the said juncture
pin and cocking piece, and in a chamber 8 that
and terminates‘ at its‘ upper open end at a point
is rearwardly of the magazine 9. ‘ The rear wall
below the rear end of bar‘ l8 when the trigger is
it] of said magazine constitutes the forward wall
of chamber 8. The forward end of sear 1 termi-. 40 in normal forward position.
Just rearwardly of the rear end of bar l8‘, and
nates adjacent wall If] and spaced slightly from
also rearwardly of the upper end of slot 28, the
said forward end is an expansion coil spring I!
plate 25 is formed with an opening for a vertical
that is adapted to react between the upper wall
pin'29 to pass therethrough. The lower end of
l2 of chamber 8 and said forward end of the
sear. Sear pin [3 adjacent the forward end of 45 said opening opens into the slot'2‘8 near the lower
end of the latter, the. said slot extending slant
said sear, and between spring I i and nose 6, piv
ingly upwardly‘ and forwardly from its lower
otally supports said sear in said chamber for
end.
swinging about the horizontal axis of said pin.
On the upper end of pin 29' is a block- 301 that
The spring ll yieldably urges the rear end of
the sear including the nose 5, in an upward‘ direc 50 is adapted to seat in an upwardly opening recess
3!‘. The'recess 3| is formed in an enlargement
tion for holding the nose 6 in a position in en
32 projecting from the guard plate into chamber
gagement with the sear notch 5. Upon urging
8. This enlargement is at about the juncture be
said rear end of the sear downwardly the nose
tween extension 26 and said guard‘ plate. The
6 will be released from engagement with the
forward wall of recess 3| is slanted upwardly and
notch 5 and the ?ring pin will be actuated under
the in?uence of the main ?ring pin spring (not
shown) for ?ring.
The upper end of trigger 3 extends into said
chamber 8 and past the sear 1 for pivotal move
ment- of the trigger on pivot pin I4, the latter
beingsecured. to the walls. of chamber 8 above.
the sear, said .sear being notched on its upper
side to, pass the said pivot pin. Adjacent pin 14.
the upper end of said trigger is formed with
a rearwardly projecting enlarged portion i=5. Be.
tween said portion 14' and wall I2: is an expansion
coil spring it that yieldably urges the lower end
of‘ trigger 3 forwardly for holding the same in
a forwardly urged position unless and until the
same- is retracted or is. moved rearwardly’ by the
trigger ?nger of the operator. Upon such re
traction of the trigger the spring H5 is compressed
and its expansive force is what causes a release
of nose 6 from the sear notch, 5 asthe retractiver
rearwardly from the forwardly‘ facing side of
said wall, and the forward edgev of block‘ 30'is
about even with the upper edge of said forward
wall.
A groove 33‘ (Fig. 3)‘ extends‘ across the
upper side of block 36'' transversely of the longi
tudinal axis of the ?rearm and the upper side
of block 30 rearwardly of‘ the groove 33 is sub
stantially higher than the portion of’ the block
forwardly of said" groove. This latter ‘portion of
block' 3'6‘ has its upper surface extending‘ slant’
ingly in continuation of the slanted upper sur
face of the forward wall‘ of the recess‘in which
the blockseats (Fig. 1‘);
The rear end of bar I8 is slanted on its‘ under
side to generally correspond with the slant of
the forward wall of recess 3| so that upon' r‘e-
traction of trigger 3 the said correspondingly
slanted surfaces of bar It‘ and block 30‘ will be
in slidable engagement. and the rear end of bar
l8 will’ be‘ caused to move upwardly (Fig. 3')‘.
2,405,798
It will be seen (Fig. 1) that when block 30 is
seated in recess 3| the rear end of bar l8, includ
ing element 22, will be elevated a predetermined
distance upon full retraction of trigger 3. The
dotted line position indicated in Fig. 1 shows the
trigger 3 retracted its full distance, and bar l8
dotted line position in Fig. 2.
A preliminary
sighting may be taken during which operation
the operator may release the pressure on the
trigger sui?ciently to permit the bar [8 and ele
ment 20 (Fig. 3) to move forwardly until the
shoulder or notch 50 in the inclined underside
and element 22 are elevated. It is also seen in
of the rear end of bar I8 engages the forward
Fig. 1 that oscillatory movement of the trigger
upper edge of block 30. At this point the for
through its full stroke will not cause a release
wardly facing shoulder 23 on element 20 engages
, of sear nose I 6 from the sear notch since the bar 10 with the projection 36 of cam member 34 and an
I8 is not su?iciently elevated.
_
abrupt increased resistance will occur due to the
The release of the sear nose 6 upon forward
straight ahead motion of member 20 against the
movement of trigger 3 is effected through actu
resistance of projection 36, and a very slight
ation of a cam member 34 that is pivoted at 35
further forward movement of the member 20
to the rear end of sear 1 rearwardly of nose 6. 15 would actuate the cam member 34 for releasing
Cam member 34 is formed with a downwardly
the nose 6 from notch 5 of the cooking piece. At
extending projection 36 that terminates at its
this point'the operator takes ?nal aim and then
lower end at a point spaced above the rear end
again releases the pressure on the trigger to per
of bar [8 when the latter is in its forward posi
mit the release of the cooking piece.
tion. The cam member 34 is formed with a por 20
The inclined surfaces at opposite sides of notch
tion at its upper end extending upwardly and
50 (Fig. 3), particularly ahead of said notch, en
forwardly of pivot 35 and in engagement with the
ables the desired forward movement of the bar
upper wall I2 of chamber 8. This engagement
l8 and member 20 with relatively little release in
between said portion of the cam and wall I2 is
pressure against the trigger even though the for
maintained at all times by action of spring II. 25 wardly facing shoulder 23 of member 2|] were to
A stop 31 on said cam below pivot 35 engages the
be in engagement with the projection 36 slightly
rear end of scar 1 to prevent rearward movement
before notch 56 engages member 30 inasmuch,
of said projection 36 beyond a predetermined
as there would be a, sliding movement of said
point while permitting forward movement thereof
shoulder relative to projection 36 until the notch
un-der force.
30 50 engages the forward upper edge of member 30.
Referring to Fig. 2, it will be seen that when
Such slow movement of projection 36 that would
the block 30 is elevated and is held elevated a
occur were the shoulder 23 in engagement there
retraction of trigger 3 will cause the rear end of
with before notch 50 reached block 30 would be
bar 18 and element 29 to be elevated or raised
come fast after the notch 50 reaches block 30,
to a position where projection 22 on element 20 35 which would result in a fast release of the cock
will slidably engage the lower end of projection
ing piece upon release of the trigger after notch
36 on cam member 34, thus depressing the rear
58 has reached block 30.
end of element 20 against spring 24 until projec
The result of the above structure is that the
tion 22 passes rearwardly of the lower end of
operator is relieved of any nervous tension he
projection 36. ‘Thereafter upon release of the 40 would otherwise be under were the ?ring to be
trigger 3 and forward movement of bar l8 and
effected immediately upon a release of the re
element 26, the shoulder 23 on said element will
tracted trigger, or at a time not determinable by
engage the lower rear corner of projection 36
“feel” on the trigger. Also the fact that the re
and will move the projection forwardly thereby
lease of the cooking piece is effected by the force
causing the upper forward portion of the cam to 45 of the spring l6 as controlled by the trigger
move upwardly. This upward movement of said
?nger instead of being effected solely by the force
portion of the cam forces the rear end of sear
1 downwardly about pivot l3 thereby releasing the
nose 6 from engagement with notch 5 and thus
of the trigger ?nger, enables the structure, here
comprising notch 50 and block 36, to provide a
far more effective indicating means than would
causing actuation of the ?ring pin for ?ring.
50 be the case in trigger mechanisms of the com
The elevating of block 3!! is effected by an arm
pression type. In the “releasing trigger” mech
38, one end of which is pivoted at 39 in the guard
anism the muscular tension applied to controlling
plate at a point forwardly of pin 29. This arm
the release of the trigger is concerned purely with
38 extends rearwardly and downwardly in slot
the relatively light force of spring I6 that re
28 below pin 29 and terminates in a plate 40 55 turns the trigger to its forward position and the
rearwardly of the guard bow and below pistol grip
relaxing of muscular tension is accomplished with
I of the stock. This plate 40 is relatively wide
far greater steadiness and precision than is pos
and is adapted to be comfortably gripped by the
sible in increasing physical tension, as occurs in
several ?ngers of the hand that embraces the
the compression type trigger. This fact makes
pistol grip during shooting or during carrying 60 it apparent that the combination of structure pro
of the ?rearm in “ready” position, or across the
body. In other words, at any time that the ri?e
or ?rearm is carried in, or is moved to a posi
tion from which it may be ?red, the plate 40
is adapted to be gripped by the ?ngers of the
hand that carries the trigger ?nger. This plate
40 thus functions as a safety device inasmuch as
the release thereof by the ?ngers gripping it will
permit said arm to fall away from the stock to
viding for an abrupt increased resistance in a
trigger of the releasing type enables the accom
plishment of results not possible in a trigger of
the compression type.
In the event the trigger of applicant's ?rearm
is retracted and the operator does not wish to
?re the piece, the mere release of the ?ngers
gripping plate 46 so as to permit the dropping of
said plate, will result in lowering block 36 away
70 from bar "3 and then the trigger may be released
the full line position of Fig. 1 inwhich position
any actuation of the trigger will be inoperative
without releasing the cooking piece.
for releasing the cocking piece.
Having described the invention, I claim:
In operation the stock of the ri?e or ?rearm
In a ?ring mechanism for ?rearms that includes
is gripped by the hand adjacent the trigger guard
a cocking piece and a, holding means therefor
bow and the trigger is fully retracted to the 75 for holding it cocked and movable in one direc
2,405,798
'7
'tion (for releasing the same, ‘a ?nger retractible
trigger, a spring connected with said trigger for
being tensioned upon such retraction for causing
return movement of said trigger against a pre
determined resistance by the trigger ?nger below
‘that required ‘for retracting said trigger, means
connecting said trigger with said holding means
for causing said movement of the latter by said
spring upon said trigger moving past a predeter
mined ‘point during its said return movement and :10
.for causing an added and abrupt resistance to
vsaidreturn movement immediately prior to move
18
ment or :said trigger past said point; said cocking
p'iece ‘being released :at said point, said last men
tioned means including a notched element :con
nected with said trigger :for movement there
with, and a member in slidable engagement with
‘said element during said return movement of
said trigger and prior to release of said cocking
piece and having ‘a shoulder engageable in the
notch in said element immediately prior to said
movement past said point.
JOHN G. SEITZ.
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