|Publication number||US2607148 A|
|Publication date||Aug 19, 1952|
|Filing date||Jun 30, 1949|
|Priority date||Jun 30, 1949|
|Publication number||US 2607148 A, US 2607148A, US-A-2607148, US2607148 A, US2607148A|
|Inventors||Simpson Clarence E|
|Original Assignee||Simpson Clarence E|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (10), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Aug. 19, 1952 c. -E. SIMPSON 2,607,148
AUXILIARY TRIGGER MECHANISM FOR FIREARMS Filed June so, 1949 Patented Aug. 19, 1952 AUXILIARY TRIGGER MECHANISM FOR FIREARMS Clarence E. Simpson, Springfield, Mass., assignor to the United States of America as represented by the Secretary of War Application June 30, 1949, Serial No. 102,186
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes Without the payment of any royalty thereon.
This invention relates to an auxiliary trigger mechanism for use in the operation of firearms under extreme cold weather conditions.
It has been determined that heavy fingerless mittens offer the utmost protection to the hands against extreme arctic Weather. However, the use of such fingerless mittens introduces considerable difiiculty in the operation of firearms and especially in the manipulation of the trigger. 7
Accordingly, it is an object of this invention to provide a firearm with an auxiliary trigger mechanism which can be readily actuated even when the operator is encumbered with heavy fingerless mittens.
It is a specific object of this invention to provide a firearm with an auxiliary trigger mechanism which can be readily inactivated at the will of the operator to permit normal manipulation of the conventional trigger.
The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:
Fig. 1 is a side elevational view shown partly in cross-section of the auxiliary trigger mechanism of this invention.
Fig. 2 is a cross-sectional view taken along the line 22 of Fig. 1 and showing the blocking member in position to prevent actuation of the auxiliary trigger.
Fig. 3 is a bottom view of the pistol grip.
Fig. 4 is a cross-sectional view similar to Fig. 2 but showing the blocking member in position to permit actuation of the auxiliary trigger.
Fig. 5 is a perspective View of the auxiliary trigger.
Although the auxiliary trigger of this invention is here shown adapted for use with a firearm having a so-called "pistol grip stock, it should be understood that a trigger of this type is equally applicable to those weapons having a straight conventional stock.
There is shown in Fig. 1 a portion of a firearm having a depending pistol grip 5 and a trigger guard 6 extending forwardly therefrom. A conventional trigger l is pivotally mounted Within trigger guard 6 as by a pin 8. A sear spring 9 is arranged to bias a pivotal sear [0 into releasable engagement with trigger I. A safety member H is rotatably mounted in the firearm above trigger guard 6 for movement between an on and off position and is slotted as shown at [2 to permit actuation of trigger 1 during the off position. The forward pivotal movement of trigger I is limited by a suitable stop surface I3 located within trigger guard 6 and the rearward pivotal movement is limited by safety member I I. Trigger 1 is provided with a finger piece 31 arranged to extend into a vertical opening l4 provided through the bottom of trigger guard 6 The front face of pistol grip 5 is contoured to provide a forwardly projecting portion It at the bottom thereof. A substantially semi-elliptical recess [5 is provided in the front face of pistol grip 5 and terminates sufficiently above the bottom of grip 5 to extend slightly into forwardly extending portion I6. A pair of spaced apart relatively narrow slots I! extend vertically through portion [6 as indicated in Fig. 3.
Recess I5 and slots I! are arranged to receive an auxiliary trigger l8 which is pivotally secured to pistol grip portion [6 as by a pin [9 or the like. Auxiliary trigger [8, as best shown in Fig. 5, comprises a channel-shaped body portion 20, the outer surface thereof being suitably contoured to conform to the grasp of either a bare or mittened hand, and a forwardly extending integral head portion 2! arranged to lie beneath trigger guard 6 when trigger I8 is assembled to pistol grip 5. An upstanding lug 22 is provided on head portion 2| and extends sufficiently into vertical opening M of trigger guard 6 to engage finger piece 31 of trigger I when auxiliary trigger I8 is pivoted about pin [9. A flat rectangular portion 23 disposed at right angles to each rear marginal edge 24 of auxiliary trigger body portion 20 is provided with a rearwardly projecting ear 25 for a purpose to be shown.
A hole 26 extends transversely through pistol grip 5 and is located so as to partially intersect recess l5 substantially midway with respect to the vertical axis of grip 5. A blocking member 21 is arranged to slidably engage in hole 26 and comprises in adjacent relationship a cylindrical section 28 at one end, a step portion 29, a first reduced diameter section 30, a forwardly tapering section 3| having a minimum diameter slightly less than that of step portion 29, a second reduced diameter section 32, and a cylindrical section 33 at the other end of blocking member 21. A suitable indentation 34 is formed in end sections 28 and 33 for receiving a drift or the nose of a bullet by means of which blocking member 21 can be moved transversely in either aco'niee 28 is forced apart slightly so as to increase the Consequently, end section'28 is frictionally engaged in hole 26 and thereby, prevents accidental movement of blocking mem-x diameter thereof.
[6. Movement of auxiliary trigger I8 is limited by the allowable movement of trigger l which depends upon the depth of slot I2 in safety member H. When auxiliary trigger H3 is depressed, ears extend beyond the respective peripheries of'cylindrioalend sections 28 and 33 and thereby prevent blocking member 21 from protruding beyond either outside surface of pistol grip 5. When released, auxiliary trigger I8 is pivoted back to its pre-firing positionby conventional trigger I through the bias of sear spring 9.
When blocking member 27 is moved to the position shown in-Fig. 2, one of the cars 25 rides onto tapered section 3| while the other contacts the periphery of step portion 29. Thus movement of auxiliar trigger i8 is blocked while conventional trigger l is free to be actuated in a normal manner when safety H is in the off position. When safety H is in the-on position, movement of trigger 7 is prevented and consequently auxiliary trigger [-3 can-not be actuated even though blocking member 21 is in the position shown in Fig. 4. ment of blocking member 21 and consequently the extent to which ear 25 rides up onto tapered section '3! is governed by the contact of lug 22 with the inner front surface of vertical opening M in trigger guard 6. It can thus bereadily seen that any existing backlash of auxiliary trigger [8 in its safe position is adequately taken up and furthermore that the vibration and shock of firing will not result in any accidental movement of blocking member 21 and consequently auxiliary trigger l8. 1
Another advantageous structural feature of this invention resides in the provision of a chamfered marginal edge 36 for semi-elliptical recess 15. As a result, the flesh of the handor the fabric of a mitten can not be accidentally pinched between auxiliary trigger l8 and'pistol rip 5.
Thus there is here provided a simplebut effective auxiliary trigger means which can be readily manipulated by the operator of the firearm even with the heavy fingerless mittens commonly worn in extreme arctic weather. At the same time, thefirearm can be quickly converted to the use ofthe conventional trigger at the will of the operator by simply pushing a blocking member in the required direction. Furthermore the use of "auxiliary trigger 18 introduces the squeeze method of trigger release which is believed by many to be superior to the conventional pull required to release a trigger.
1. In a firearm having a pistol grip,-the' combination of a pivotal primary trigger and auxiliary trigger means comprising an auxiliary trigger pivotally mounted in the pistol grip and The transverse move-- 4 protruding forwardly therefrom in order to be readily grasped by a mittened hand, lug means on the free end of said auxiliary trigger for actuating said primary trigger when said auxiliary trigger is squeezed, and means for blocking movement of said auxiliary trigger whereby discharge of the firearm can be effected only by directly pulling said primary trigger.
2. In a firearm having a pistol grip terminating in a forwardly extending trigger guard provided with 'a slot extending vertically through the bottom thereof, the combination of a primary trigger pivotally mounted in the trigger guard so that the free end extends into the slot thereof and auxiliary trigger means comprising an auxiliary trigger pivotally mounted at its lowerend in the pistol grip and projecting forwardly therefromto permit ready grasping by a mittened hand, an upstanding lug on the free end of said auxiliary trigger arranged to extend into the trigger guard slot forwardly of the free end of said primary trigger whereby actuation of said auxiliary trigger simultaneously actuates said primary trigger, and means for blocking the actuating movement of said auxiliary trigger whereby discharge of the firearm can be effected only by directly pulling said primary trigger.
3. In a firearm having a pistol grip terminating in a forwardly extending trigger guard, the
combination of a primary trigger pivotally mounted in the trigger guard and auxiliary trigger means comprising an auxiliary trigger pivotally pinned at its lower end adjacent the bottom of the pistol grip, the forward edge of the grip being cut away to form a semi-elliptical recess for receiving said auxiliary trigger so that the forward portion thereof projects from said recess in position to be readily grasped by a mittened hand, lug means integrally formed on the free end of said auxiliary trigger and extending upwardly therefrom to contact the front edge of the free end of said primary trigger, and a blocking member slidably mounted in the pistol grip in the path of movement of said auxiliary trigger whereby transverse movement of said member in one direction blocks the actuating movement of said auxiliary trigger so that discharge of the firearm can be effected only by a direct pull on said primary trigger and whereby transverse movement of said blocking member in the opposite direction frees said auxiliary trigger so that actuation thereof will also simultaneously actuate said primary trigger to discharge the firearm.
CLARENCE E. SIBAPSON.
REFERENCES CITED Thefollowing references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,569,856 E riksen Jan. 19, 1926 1,837,093 Andrews Dec. 15, 1931 2,000,858 Maxwell May '7, 1935 2,225,583 Blizard Dec. 1'7, 1940 2,433,309 Van Karner Dec. 23, 1947 FOREIGN PATENTS Number Country I Date 15,065 Great Britain of 1897 326,260 France Feb. 16, 1903 554,287 Germany July '7, 1932
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1569856 *||May 11, 1925||Jan 19, 1926||Emil Eriksen Johan||Automatic pistol|
|US1837093 *||Jul 18, 1930||Dec 15, 1931||Isaac Andrews||Gun attachment|
|US2000858 *||Jul 5, 1933||May 7, 1935||Ray Maxwell William||Safety device for firearms|
|US2225583 *||Jan 31, 1940||Dec 17, 1940||Western Cartridge Co||Safety device for the firing mechanisms of firearms|
|US2433309 *||Mar 23, 1944||Dec 23, 1947||Karner Joseph W Van||Firing mechanism for signal pistols|
|DE554287C *||May 16, 1931||Jul 7, 1932||Karl Pommeranz||Selbsttaetig sichernde Abzugsvorrichtung fuer Schusswaffen|
|FR326260A *||Title not available|
|GB189715065A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2943412 *||Sep 18, 1953||Jul 5, 1960||Colt S Mfg Co||Trigger operating means for a pistol|
|US3141254 *||Apr 18, 1962||Jul 21, 1964||Savioli Giulio V||Auxiliary trigger device with safety|
|US4553347 *||Jun 25, 1984||Nov 19, 1985||Jackson Francis J||Gun trigger actuator|
|US4569145 *||Jan 16, 1985||Feb 11, 1986||Sturm, Ruger & Company, Inc.||Inactivating selector arrangement for bolt action firearms|
|US4685379 *||Jul 14, 1986||Aug 11, 1987||Troncoso Vincent F||Multiple firing gun and trigger extension assembly|
|US4986019 *||Oct 30, 1989||Jan 22, 1991||Olin Corporation||Industrial shotgun|
|US5038507 *||Aug 22, 1990||Aug 13, 1991||Olin Corporation||Industrial shotgun|
|US5325760 *||Dec 3, 1992||Jul 5, 1994||Olin Corporation||Autofire mechanism for industrial guns|
|US5780762 *||Nov 22, 1996||Jul 14, 1998||Tanio Koba Co., Ltd.||Continuous shooting device and gun or toy gun|
|US8505225 *||Mar 29, 2012||Aug 13, 2013||Mark L. Degener||Firearm trigger assembly|
|U.S. Classification||42/69.1, 42/70.6|
|International Classification||F41A19/00, F41A19/09|