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Publication numberUS1215181 A
Publication typeGrant
Publication dateFeb 6, 1917
Filing dateApr 22, 1916
Priority dateApr 22, 1916
Publication numberUS 1215181 A, US 1215181A, US-A-1215181, US1215181 A, US1215181A
InventorsCharles Newton
Original AssigneeJohn F Nagel, Charles Newton
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Trigger mechanism for firearms.
US 1215181 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

C. NEWTON..

TRSGGER MECHANISM FOR FIREARMS. APPLxcATioN men APR. 22, w16.

Patented Feb. 6, 1917.

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30 Huug ,Ivm/engin dischar 'inv' the firearm and thus enable the l STATES PATENT @FFQEQ OHAELEs NEWTON, or BUFFALO, NEW Yon/K, assrcNoE or ONE-HALE To JOHN E. NAGEL, OE EUEEALO, NEW YORK.

TRIGGER IJIECHANISM FOR FIREABMS.

Application Ied April 22,

To all 'whom t may concern:

Be it known that l, CHARLES NEwroN, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Trigger Mechanisms for Firearms, of which the following is a specification.

This invention relates generally to firearms which are fired from the shoulders or hands and more particularly to firearms having a set trigger mechanism by which the same are discharged.

ln firearms of this character as heretofore constructed the full strain of the main spring has usually heen exerted against the sear so that it -was difiicult to obtain a light pull for discharging the firearm, this being due to the fact that the amount of contact which was necessary between the bent of the firing head and the seaito restrain the strength of the main spring precluded an easy release of the firing head bent from the sear. It has also been customary heretofore to employ a double set of triggers viz. a front or releasing trigger, and a` rear or set trigger, these triggers being so organized that when the front trigger is pressed the rear trigger fiies up and operates a knock-off attached to the scar thus operating the firearm with a much lighter pull than is possible when no set trigger is used. It is frequently desirable to use the front trigger On a direct pull withoutl the intervention of the set trigger and in such cases it is desirable that the front trigger should release the sear from the bent of the firing head and discharge the firearm rwithout undue loss of motion. .In all forms of set trigger mechanism heretofore devised f it has been necessary to draw the front trig`- ger back a considerable distance before it would engage the knock-off and discharge the firearm by a direct pull.

One of the Objects of this invention is to i provide a trigger mechanism in which two knockoffs are used and associated in such manger with the front and rear triggers that pressure upon either of the same will release the sear from the bent of the firing head foi saine to be operated with a` minimum of lost motion.

Another object of this invention is to improve the construction and manner ofl mounting the front and rear triggers so as C) ab Specification of Letters Patent.

Patented Feb. 6, 191W.

191e. serialivaeasoz.

to simplify the same and reduce the cost of manufacture.

A. further object of this invention is to provide an improved spring device which is of simple, inexpensive and reliable form and which serves the' double function of yieldingly turning both the front and rear triggers so that they tend constantly to move in a direction in which their fingerpieces move forwardly.

ln the accompanying` drawings: Figure l is a. fragmentary side elevation, partly in section, of a breech loading rearm equipped with my improvements and showing the trigger mechanism cocked for firing the same with the set trigger knock-off. F ig. 2 is a similar view showing the position of the parts preparatory to cooking` the firearm. Fig. 3 is a similar view showing the parts in the position which they occupy after the trigger mechanism is operated so as to fire the gun directly through the releasing trigger knock-o. Fig. d is a detached side elevation of the lower frame of the firearm and that part of the trigger mechanism mounted thereon. Fig. 5 is a top plan view of the parts shown in Fig. d. F 6 is a vertical transverse section taken on line 6 6, Fig. 4C. Fig. 7 is a perspective view of the spring for operating the front and rear triggers.

Similar characters of reference indicate corresponding parts throughout the several views.

The main elements of the firearm which are shown in the drawings, as an example of the various forms which are capable of using my improvements, comprise a. wooden stool: l, an upper metal frame 2 secured to the upper part of the stock, a lower frame 3 secured to the lower part of the stock, a longitudinally movable firing bolt t guided in the upper frame and provided with' a firing head 5 having a forwardly facing bent or shoulder 6 on its underside, and a vertically swinging sear 7 arranged in a recess 8 formed in the stock between the upper and lower frames and pivoted at its front end to the upper frame by means of a pin 9. This sear is provided at its rear end with a nose 10 which projects upwardly through an opening ll in the upper frame in such a posiion that its rear side may be engaged with he bent of the firing head. The sea'r is yieldingly held in its operative position in which its nose is arranged in the path of the firing head bent by means of a spring 12 operating on a forwardly projecting arm 13 of the sear. rlhis spring may operate upon this arm in any suitable 'manner but as shown in the drawings the same bears at its lower end against the bottom of a socket in the upper side of the arm 13 while its upper end bears against a follower 14 guided in said socket and bearing against a'bolt stop 16 or other suitable abutment which may be provided for this purpose.

My improved trigger mechanism which is associated with the above described parts may bevariously constructed so far asY the details of the same are concerned but in the preferred form of'this mechanism that shown ,in the drawings is suitable and as there shown the saine is constructed as follows:

Direct and indirect knock-offs are arranged transversely side by side in a slot 19 formed lengthwise in the sear and pivotally mounted on the latter by means of a horizontal transverse pin 2O passing through these knock-offs and the adjacent part of the scar. Both of these knock-offs are constructed in the form of cam levers, the front or direct knock-ott being provided above and in front of its pivot with a cam or heel 21 and a downwardly projecting front arm 22 while the rear or indirect knock-o is provided above and in rear of its pivot with a cam or heel 23 and a rear arm 25 which projects downwardly and rearwardly.

17 represents the front or releasing trig- Vger and 1S the rear or set trigger both of which project through a longitudinal slot 27 formed in the lower frame in line with the stock recess and within the trigger guard 28 which projects downwardly from the lower frame. Projecting upwardly from the lower frame along opposite sides of the slot therein and along opposite sides of the central parts of the front and rear triggers aretwo supporting lugs 29, 29 which are preferably formed integrally with the lower frame. r)The central part of the front trigger is pivoted to the front parts of these lugs by means of a horizontal transverse pin 31 and the central part of the rear trigger is pivoted to the rear parts of these `lugs by means of a horizontal transverse pin 30. The front trigger is provided with a ingerpiece 32 which projects downwardly from the pivoted centralrpart of this trigger into the space within the front part of the guard and above its pivot 4this trigger is provided with a rearwardly projecting stop lug 33 and an upwardly projecting catch or detent arm 34 which is provided'on its rear side with a downwardly facing bent or shoulder 35. OnV its front side between the upper and lowerI ends of this trigger the same is provided with a downwardly facing shoulder or seat 36. The

stop lug 33 of the front trigger is adapted to bear against the upper end of an adjusting screw 37 which engages with a screw threaded opening or seat 3S formed partly on opposite longitudinal walls of the slot 27 of the lower frame between the front and rear triggersf By suitably adjusting this screw the forward movement of the fingerpiece of the front Vtrigger and the corresponding rearward movement of its catch arm 34 may be determined.

The rear trigger is provided with a fingerpiece 39 which projects downwardly from the pivoted central part thereof into the space within the rear part of the guard and above its pivot this rear trigger is provided with a forwardly projecting hammer arm 40 which is arranged lengthwise in line with the catch arm of the front trigger. The front end of this hammer arm is so constructed that it'inay be engaged with the shoulder or bent 35 of the catch arm. The latter is arranged in front of the arm of the front knock-off or cam lever and the hammer arm of the rear gger is arranged belowthe arm of the rear knock-off or cam lever.

A spring device is provided which constantly tends to turn the front trigger in the direction for moving its fingerpiece forwardly and its catch rearwardly and to move the'fingerpiece of the rear trigger forwardly and its hammer arm upwardly. 1n its preferred form this spring device is constructed of a single piece of spring wire which is bent to form two upper arms 41, 42, two lower arms 43, 44 arranged respectively below the upper arms, two coils 45, 46 each of which connects the rear ends of the companion upper and lower arms forming a pair, an upper horizontal transverse bar 47 connecting the front ends of the upper arms, and a lower horizontal transverse bar 4S projecting` laterally from the front end of one ofthe lower spring arms, the lower spring arm 44 being comparatively short, and the other lower spring arm 43 which carries the lower cross bar 4S being comparatively long and bent downwardly about midway of its length so as to form a downwardly projecting elbow 49 and divid- Ving this long lower spring arm into two front and rear sections which diverge up' wardly, as shown in Fig. 7. If desired, the coils 45, 46 may be omitted and the upper and lower arms of the trigger spring connected by plain turns. Thisspring is mounted so that its arms are arranged lengthwise adjacent to the outer sides oftheV supporting lugs on the lower frame. The coils of this spring receive opposite ends of the pivot pin 30 which connects the rear trigger with these lugs, the upper cross bar 47 engages with the underside of the hammer arm of the rear trigger, the lower cross bar 48 enllt v the supporting :i the downwardly facing shoulder 38 ef t le front trigger adjacent to the front of the supporting lugs, the downwardly bent elbow between the front and rear sections of the long spring arm 43 bears against the upper side of the lower frame adjacent to the cuter side of one of lugs and the front end of the shcrt lower spring arm 44 bears against the upper side of the lower frame adjacent to the other supporting lug.

The front parts of the supporting lugs 29 are provided with downwardly facing stop shoulders 50 which are adapted to be engaged by this upper cross bar 47 of the trigger spring and limit the upward movement thereof.

When the firearm is fully cocked preparatory to being iired through the medium of the set trigger by drawing or pulling the ingerpiece of the front or releasing trigger backwardly, the firing head cf the bolt is drawn backuf'ardly and engaged with its bent against the nose of the scar, the cams or heels of both knock-off levers are so turned that the same are retracted from the underside of the upper frame, the catch or detent arm of the front trigger is close to the rear side of the arm of the front knock-oit lever, and the hammer arm of the rear trigger has been lowered out cf engagement from the arm cf the rear knock-off lever and engaged with the shoulder of the detent or catch arm, as shown in Fig. 1, in which position of the parts the various parts of the trigger spring are under their maximum tension. Upon now pulling the fingerpiece of the front trigger rearwardly in opposition to the resilience of the trigger spring the first effect is to withdraw the catch shoulder 35 of the front trigger forwardly out of engagement from the hammer arm 40, thereby releasing the latter and permitting the same to be thrown upward by the resilience of the trigger spring engaging therewith. During the first part of this upward movement of the hammer arm the same moves idly from the position shown by full lines in Fig. 1 to the position shown by full lines in Fig. 2, at the end of which movement the hammer arm engages with the underside of the arm of the rear knock-o lever, and during the remainder of the upward movement of this hammer arm the same delivers an upward blow against this knock-off arm during which time this hammer arm and knock-off arm are shifted from the position shown by full lines in Fig. 2 to the position shown by dotted lines in Fig. 2, thereby causing the cam or heel of this rear or in direct knock-off lever, by engaging with the underside of the upper frame, to draw the sear downwardly and disengage its nose from the bent of the firing head, whereby the latter and the bolt are permitted to fly forwardly under the action of the usual main spring and discharge the firearm. While the firearm is being discharged the upward movement of the upper spring arms 41, 42 and the cross bar 47 connecting the same is limited by engagement of the latter with the shoulders 50 of the lugs 29, as shown in Fig. 4 while the hammer arm 40 continues its movement independently of these parts of the trigger spring and delivers a blow against the rear or indirect knock-off lever. After the firearm has been discharged in this manner the rear knock-off lever rebounds under the action of the sear spring 12 and the set trigger returns to its normal inoperative position, as shown by full lines in Fig. 2, in which the front end of the hammer arm engages with the upper end of the catch arm 22 but does not engage underneath the shoulder of the latter.

When the firing head 5 is drawn backwardly and engaged with its bent against the nose of the sear and it is desired to discharge the gun directly by a pull on the front or releasing trigger instead of indirectly through the hammer blow of the rear or set trigger, the trigger mechanism would be arranged in the position shown by full lines in Fig. 2. For discharging the firearm directly while the parts are in this position it is only necessary to pull rearwardly on the ngerpiece of the front or releasing Y trigger and the result of this operation causes the catch arm of the releasing trigger to move forwardly against the arm 19 of the front knock-ofin lever and turn the same forwardly, whereby the cam or heel of the latter is caused to operate against the underside of the upper frame and draw the sear downwardly, thereby disengaging the nose of the sear from the bent of the firing head and permitting the firing bolt tc fly forward under the action of the main spring and discharge the cartridge.

The relative arrangement of the catch arm 34 and the direct or front knock-ofi'1 lever 22 is such that when the mechanism is set for discharging the gun indirectly through the set trigger and associated parts the rear knock-off lever 25 will be operated to discharge the irearin before the arm 22 of the front knock-off lever has been moved to operate the scar and discharge the firearm, this being preferably accomplished by providing sufficient clearance between the catch arm 34 and the arm 2Q of the front knock-off lever for this purpose, as shown in Fig. 1.

By this means the discharge of the firearm may be effected by transmitting the pull on the releasing trigger either directly to the sear or indirectly through the hammer of the set trigger with a minimum loss of motion, thereby increasing the accuracy of the fire and the utility of the rearm accordingly. Furthermore, this trigger mechanism permits of discharging the firearm with a comparatively light pull on the front trigger, thereby reducing to a minimum the liability of interfering with the aim.

This entire trigger mechanism is very simple in construction7 the same can be produced at comparatively low cost and the various parts may be assembled or dismembered for inspection or cleaning without requiring any special tool for this purpose.

I claim as my invention:

l. A firearm comprising` a movable iiring head having a bent, a sear adapted to engage said bent, direct and indirect knockoffs mounted on said sear and engaging a relatively stationary abutment, areleasing trigger engaging withv said direct knock-off, and a set trigger engaging said indirect knock-o and controlled by said releasing trigger.

2. A firearm comprising a movable tiring head having a bent, a sear adapted Vto engage said bent, direct and indirect knockois pivoted on said sear and each having a cam engaging with a relatively stationary abutment and having a depending operating arm, a. releasing trigger having a lower iingerpiece and an upper catch arm engaging the operating arm of said direct knock-od, a set trigger having a lower iingerpiece and an upper hammer arm adapted to engage the operating arm of said indirect knock-off and also adapted to be engaged by said catch arm and held thereby in a retracted position, and a spring device for turning said triggers so that their ngerpieces move forwardly.

3. A irearm comprising a movable tiring head having'a bent, a sear adapted Vto engage said bent, direct and indirect knockoffs pivoted on said Sear and each having a @am engaging with a. relatively stationary abutment and having a depending operating arm, a releasing trigger having a lower fingerpiece and an upper catch arm engaging the operating arm of said direct knock-od, a set trigger having a lower fingerpiece and an upper hammer arm adapted to engage the operating arm of said indirect knock-ofi and also adapted to be engaged by said catch arm and held thereby i-n a retracted position, a spring device for turning said triggers so that their ngerpieces move forwardly and stops for limiting movement of said triggers under the action of said spring device.

4. A firearm comprising a movable firing head having a bent, a scar adapted to engage said bent, direct and indirect knockoffs pivotedon said sear and each having a cam engaging with a relatively stationary abutment and having a depending operating arm, a releasing trigger having a lower ingerpiece and an upper catch arm engagjacent ends ing the operating arm or' said direct knockol, a set trigger having a lower ingerpiecc and an upper hammer arm adapted to cngage the operating arm of said indirect knock-od' and also adapted to be engaged by said catch arm and held thereby in a retracted position, a frame provided with a slot through which said triggers project and with a supporting lug adjacent to said slot to which the triggers are pivoted, and a spring operating to turn said triggers in the direction in which the iingerpieces of the same move forwardly.

5. A firearm comprising a movable tiring head having a bent, a scar adapted to cngage said bent, direct and indirect knockoils pivoted on said sear and each having a cam engaging with a relatively stationary abutment and'having a depending operating arm, a releasing trigger having a lower fmgerpiece and an upper catch arm engaging the operating arm of said direct knock-ofi, a set trigger having a lower iingerpiece and an upper hammer arm adapted to engage the operating arm of said indirect knockoii and also adapted to be engaged b y said catch arm and held thereby in a retracted position, a frame provided with a slot through which said triggers project and with a supporting lug adjacent to said slot` to which the triggers are pivoted, and a spring operating to turn said triggers in the direction in which the iingerpieces of the same move forwardly comprising upper and lower spring arms connected at one'of their corresponding ends while their opposite ends engage said triggers, respectively.

6. A firearm comprising a movable iring head having a bent,'a scar adapted to engage said bent, direct and indirect knocko's pivoted on said sear and each having a. cam engaging with a relatively stationary abutment and having a depending operating arm, a releasing trigger having a lower fingerpiece Vand an upper catch arm engaging the operating arm of said direct knockof, a set trigger having a lower iingerpiece and an upper hammer arm adapted to engage' Vthe operating arm of said indirect knock-off and also adapted to be engaged bysaid catch arm and held thereby in a retracted position, a trame provided with a slot through which said triggers project and with a supporting lug adjacent to said slot to which the triggers are pivoted, and a spring operating to turn said triggers in the direction in which the iingerpieces of the same move forwardly comprising upper and lower spring arms having one of their adpivot of said set-trigger, a cross bar arranged on said upper spring arm and engaging said hammer arm, and a cross bar arranged on the free end oi said lower arm and engaging with said catch arm, said connected and mounted on theA llilower' arm being' provided between its ends with downwardly projectingelbow which rests on said frame.

7. A firearm comprising a movable firing head having' a bent, a sear adapted to engage said bent, direct and indirect lnocloots pivoted on said sear and each having a cam engaging with a relatively stationary abutment and having a depending' operating arm, a releasing trigger having a lower fingerpiece and an upper catch arm engaging the operating arm of said direct lino-ckoil", a set trigger having a lower ngerpiece and an upper hammer` arm adapted to engage the operating arm oiE said indirect knock-oft and also adapted to be engaged by said catch arm and held thereby in a retracted position, a. frame provided with a slot through which said triggers project and with a supporting lug adjacent to said slot to which the triggers are pivoted, and a spring operating to turn said trigg'ers in the direction in which the ngerpieces of the same move forwardly comprising upper and lower spring arms having one ot their adjacent ends connected and mounted on the pivot of said set-trigger, a cross bar arranged on said upper spring arm and engaging said hammerl arm, and a cross bar arranged on the free end of said lower arm and engaging' with said catch arm, said lower arm being provided between its ends with a downwardly projecting elbow which rests on said frame and a stop arranged on said supporting lng and adapted to e engaged by thecross bar of said upper spring arm.

8. A firearm comprising a movable ring head having a bent, a sear adapted to engage said bent, direct and indirect knockoffs pivoted on said sear and each having a cam engaging with relatively stationary abutment and having depending operating arm, a releasing trigger having a lower iingerpiece and an upper catch arm engaging the operating arm of said direct knockoli, a set trigger having a lower lingerpiece and an upper hammer arm adapted to engage the operating arm of said indirect knock-0E' and also adapted to be engaged by said catch arm and held thereby in a retracted position, a frame provided with a slot through which said triggers project and with supporting lugs on opposite sides of Copies of this patent may be obtained for ave cents each, by addressing said slot to which the triggers are pivoted, and a spring operating to turn said triggers in the direction in which their fingerpieces move forwardly and comprising a pair of upper and lower arms arranged adjacent to the outer side of each supporting lug and having two of their corresponding ends connected and mounted on the pivot of said set trigger, an upper cross bar connecting the free ends of said upper spring arms and adapted to engage said hammer arm and stops on said supporting lugs, and a cross bar arranged on the free end of one of said lower spring arms and engaging with a shoulder on said releasing' trigger, said lower spring arm having the lower cross bar being pro vided between its'ends with a downwardly projecting elbow which rests on said frame.

firearm comprising a movable tiring head having a bent, a sear adapted to engage saidvbent, direct and indirect knockoffs pivoted on said sear and each having a cam engaging with a relatively stationary abutment and having a depending operating arm, a releasing trigger having a lower iin'gerpiece and an upper catch arm engaging the operating arm of said direct knock-off, a set trigger having a lower iingerpiece and an upper hammer arm adapted to engage the operating arm of said indirect knock-off and also adapted to be engaged by said catch arm and held thereby in a retracted position, a frame provided with a slot through which said triggers project and with supporting lugs on opposite sides of said slot to which the triggers are pivoted, and a spring operating to turn said triggers in the direction in which their ingerpieces move forwardly and comprising a pair of upper and lower arms arranged adjacent tothe outer side of each supporting lug and having two of their corresponding ends connected by coils mounted on the pivot of said set trigger, an upper cross bar connecting the free ends of said upper spring arms and adapted to engage said hammer arm and stops on said supporting lugs, and a cross bar arranged on the free end of one of said lower spring arms and engaging with a shoulder on said releasing trigger, said lower spring arm having the lower cross bar being provided between its ends with a downwardly projecting elbow which rests on said frame.

CHARLES NEWTON.

the Commissioner of Patents,

Washington, D. C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2425761 *Jan 7, 1946Aug 19, 1947Staller Jack JAdjustable trigger stop
US2558872 *Nov 24, 1948Jul 3, 1951Miller Elmer ESet trigger mechanism
US2935808 *Apr 1, 1958May 10, 1960Olin MathiesonSet trigger mechanism
US4411087 *Oct 23, 1980Oct 25, 1983Aikman Floyd OTrigger mechanism for firearms
US4499684 *Mar 7, 1984Feb 19, 1985Mauser-Werke Oberndorf GmbhTrigger mechanism
US4625444 *Apr 12, 1985Dec 2, 1986Fabrica D'armi P.Beretta S.P.A.Hair trigger for a rifle
Classifications
U.S. Classification42/69.2
Cooperative ClassificationF41A19/16