US1741281A - Trigger mechanism for firearms - Google Patents

Description

Dec. 3vl, 1929. F. F. BURTON 1,741,281

TRIGGER MECHANISM FOR FIREARMS Filed April 22. 1929 2 Sheets-Sheet l im@ l 4 A Dec. 3l, 1929. 1 F. F. BURTON 1,741,281

TRIGG'ER MECHANISM FOR FIREARMS Y Filed April 22, 1929 2 Sheets-Sheet 2 MIIHIIIIIIHHM I Patented Dec.` 31,' 1929 UNITED STATES Hiram"l orifice FRANK E. BURTON, oF MoUN'i` CARMEL, coNNEcrroUr, AssrGNoR To WINCHESTER EEPEATING ARMs co., or NEW HAVEN, coNNEcrIcUr, A coEroRArroN oE DELA- WARE TRIGGER MEHANISM FDR FIREARMS Application filed April 22, 1929. Serial No. 356,984.

This invention relates to an improvement in trigger-mechanisms for firearms and particularly to that class of firearms in which the firing-pin or its equivalent exerts a constant effort to swing the sear out of cocking `engagement with it, in which position the said Sear is releasably retained by the trigger; such a type of trigger-mechanism being shown in United States Patent No. 132,222, granted October 15, 1872, to F. Von Martini, and

. of the r .tion of a firearm provided United States Patent No. 145,118, granted' December`2, 187 3,'to Daniel Moore'.

One 'of the `objects of my invention is ton reliable and durable trig-V provide a simple, ger-mechanism of the class described, constructed with particular reference to smoothness and certainty of operation.

Another object of my invention is to provide a trigger-mechanism of the class described having a smooth and adjustable travel ofthe trigger for releasing the firing-element earm.

`With the above objects in view, my invention consists` in a trigger-mechanism for lirearms, having certain details of construction and combinations of parts asA will be hereinafter described and particularly recited in the claims.

In thel accompanying drawings:

Fig. 1 is a broken view, partly in elevation and partly in vertical longitudinal secwith my improved trigger-mechanism, the parts being shown in the positions due them when the gun iscocked, ready for firing;

Fig. 2 is a corresponding view but show-i view of the assemblytary side- arms 11 and 12 of a sheet-metal assembly-yoke 13 which is secured by means of a screw 14 to the underside of the receiver 15 of the arm.

The sear l0 above referred to is mounted at its forward end upon a pin 16 extending transversely therethrough and between the the arms 11 and 12 of the assembly-yoke 13.

At its rear end the sear 10 is formed with an upstanding Sear-nose 17, the reanupper corner 18 of which is forwardly and upwardly inclined and is adapted to engage a similarly inclined cam-like latching-shoulder 19 formed upon the underside of the reciprocating tiring-pin 20,which latter is of usual form and requires no detailed description other than to say that it is urged forward by the usual firing-pin spring 2l housed within it and is itselfhoused within a recipf with reference to the pivot-pin 16 that the forward urge of the tiring-pin 20 under the tension of its spring 21 tends to rock the Sear 1() downward against the counter-urge of a scar-spring 24 mounted in a pocket 24(a in the upper face of a forwardly-olsetting portion 25 of the said sear 10 and impinging at its upper end against the adjacent underface of the receiver 15 (Fig. 2).

To releasably retain the sear 10 in position to prevent the forward movement of the ring-pin 20, as shown in Fig. l of the drawings, I provide a horizontal Sear-supporting shoulder 26 offsetting from the rear face of the upper arm 27 of a pivotal trigger' 28 mounted upon a pin 29 extending transversely between the depending complementary arms 30 and 31 of the assembly-yoke 13, and formed with the usual curved fingerpiece 32 projecting below the firearm.

The shoulder 26 of the trigger 28 is adapted to engage the uhderface 33 of the sear 10 adjacent the rear wall of a vertical slot 34 formed therein and receiving the upper end of the arm 27 of the trigger 28, as clearly shown in the drawings.

A trigger-spring 35 having its lower end seated in a pocket 36 of the trigger fingerpiece 32 and havin its upper end encircling a linger 37 depen ing from the rear wall of the assembly-yoke 13, exerts a constant eort to swing the trigger counter-clockwise and hence yieldingly maintain the shoulder 26 thereof beneath the surface 33 of the scar,

` as shown in Fig. -1 of the drawings.

To limit the rearward movement of the upper end of the arm 27 ofthe trigger and hence the degree to which the shoulder'26 thereof underlies the surface 33 of the Sear, I mount in the rear end of the said sear an inclined abutment-screw 38 reduced at its forward end te form a stop-nger 39 projecting forward into the slot 34 and adapted l l to be engaged by the rear face ofthe arm 27 of the trigger to limit the rearward swing thereof. 4

For the purpose of swinging the sear 10 downward completely out of the path of the bolt 22 so as to, .permit its withdrawal from the firearm, I form the upper forward face of the arm 27 of the .trigger 28 with a cam-surface 40 adapted to co-act with a pin 41 extending transversely across the slot the firing-pin 2O and the inclination of the rear upper corner 18 of the scar-nose 17, the urge' ofthe firing-pin spring 21 will act to cam the sear 10 downward yagainst the counter-urgeof the spring 24 and thus permit the firingfpinto move forward and fire the cartridge in the chamber (not shown) of the firearm. The parts will have thus assumed the positions in which they are shown in Fig. 2 of the drawings.

Now, after the discharge of the arm as 4 above described, when the firing-pluis restored to the position in which it is shown in Fig. 1, the scar-spring 24 will be permitted to act to swiingthe sear clockwise to again interpose the Sear-nose 17 in' th'path of the of the adjusting-screw 38 projects into the slot 34 and lhence the degree to which the said trigger must be pulled before releasing the sear. Thus, if it is desired to increase the degree to whichdthe trigger must oe pulled before releasing the Sear, the screw 38 may be backed out of the sear so as to permit the shoulder 26 of the trigger to ride further under the surface 33. If, on the other hand, a slighter degree of trigger-pull isrdesired tol release the Sear, the screw 38 will beadvanced so as to cause its stop-finger to project further within the slot 34 of the sear.y

I claim: l 1. In abolt-action firearm, the combinationwith a vertically-slotted scar pivoted at ts forward end in the firearm structure;

a firingipin formedin its underside with an inclined cam-like latching-shoulder adaptedto be engaged by a portlonof the said scar and to cam the same into its releasing position; and a pivotal trigger vhaving its upper end exten the said sear and provided with a shoulder adapted to udcrhe Aa portion of the said ment with the latching-shoulder of the said firing-pin against the counter-urge of thel by a portion of the said sear and to cam the sameinto its `releasing position; a pivotal the slot-in the said scar and provided with a shoulder adapted to vunderlie a portion of the said sear to releasably hold the same in engagement with the latching-shoulder of the said firing-pin against the counter-urge of the firingpin spring; and an adjustingscrew mounted in the rear end of the said sear and projecting into the; slot therein to engage the upper end of th said trigger to adjustably limit the rearward swing thereof.

In testimony whereof, I have signed this specification.

. FRANK F. BURTON.v

shoulder 19 of the firing-pin and in so doing f will also permit the upper arm 27 of the` trigger 28 to swing rearward under the urge of the trigger-spring 35 and re-locate the shoulder 26 beneath the surface 33 of the The parts are now restored to the positions shown in Fig: 1 of thev drawin s, preparatory to anotherdischarge of the rearm.

It will be noted that the distacewhich the shoulder 26 of the trigger 28 underlies the surface 33 of the Sear-10 is determined by the degree to which the stopffi'nger ,39

ed into the slot'in sea'r to releasably hold the samein engage- ,trigger having its upper. -end extended into

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