US2492814A - Fire-control means for semi-automatic firearms - Google Patents

Description

Dec. 2.7, 1949 1'. R. ROBINSON, .JR

FIRE CONTROL MEANS FOR SEMIAUTOMATIC FIREARMS 2 sheets-sheet 1 T. R. ROBINSGN, JR

FIRE CONTROL MEANS FOR SEMIAUTMATIC FIREARMS 22 Sheets-Sheet 2 T Ly/ Patented Dec. 27, 1949 si PATENT orric FIRE-CONTROL MEANS FOR SEMI- AUTOMATIC FIREARMS Thomas R. Robinson, Jr., Newtown,Y Conn., as-

sgnr to The MarlinFirearms Company, New Haven, Conn., a corporation of Connecticut Application November 15, 1947, Serial No. 786,232

9 claims. (ci. ssa-'145) The present invention relates in general to firearms and more especially to a self-loading flrearm of the type disclosed in my co-pending application Serial No. 766,663 led August 6, 1947, now Patent No. 2,454,885, issued November 30, 1948.

An. object of the present invention is to provide superiorufre-control meansforl firearms of the typewherein the energy of .explosion of a cartridge is used to perform the operations incidenttoureloadingwthe; nthe next shot.;A A further object of the. invention is to provide va self-loading firearm with superior fire-control means wherein positive means is provided to prevent more than one shot from being fired each 1,(

time the triggerJis pulled.

`A` still, further object of the invention is Y to provide a self-loading firearm with superior antidoubling means embodying a minimum number of elements, all of-which are extremely economical to manufacture, easy to fabricate and durable Yin use. Y

With the above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the s aid disclosure which are novel over the prior art and which are not claimed in any Yseparate application.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a broken side elevation in section of a self-loading rearm embodying the improved anti-doubling `means of this invention, the Abreech-bolt ofthe firearm being shown inits :closed position andi-the firing-plunger held in its retracted cocked position by the sear;`

Fig. 2 is'a fragmentary plan view on section line 2-2 of Fig. 1 showing the position of the dis- .connector of the anti-doubling means at the time the breech-bolt is in its forward breech-closing position; 'y Fig. 3 is a fragmentary plan view similar to Fig. 2 but showing the disconnector of the antidoubling means displaced by the camming action of .the rear vend of the breech-bolt as the latter `noves out of battery;

Fig. 4, is a rfragmentary end elevation of the receiver of the firearm on section line 4-4 of Fig. l showing thedisconnector of the anti-doubling `means immediately above the transmitting-.mem- `.benthereof and in contact withthe. sear;.

Fig. 5.. isV a fragmentary end elevation. .ofY the greceivergoi thefirearm similar to .Figli but with the.. disoonnector of theY anti-doubling means firearm in preparation `for n Ashifted-to the left out of alignment with the transmitting-means;

Fig. 6 is a fragmentary end elevation of the receiver of the firearm on section line 6--6 of Fig. 1

showing the relationship between the safety and the transmitting-member of the anti-doubling means;

Fig. Vl'I is a plan view of the underside of the breech-bolt showing the cam-slot therein;

Fig. 8 is aperspective view of the disconnector ofthe anti-doubling means of this invention;-. and Fig. 9 isa perspective view of the transmittingmember of the anti-doubling means of this invention. Y.

s. Referring particularly to Fig. 1, the firearm chosen for the purposes of villustrating the present invention embodies a substantially solid stock indicated generally at IIJ having a longitudinalrecess II substantially rectangular in cross section formed in the top side of the stock to accommodate the barrel, receiver and trigger-plate. assembly of the rearm. A trigger-guard I2 is` secured to the underside of the stock opposite a vertical aperture which communicates with the stock-recess I I adjacent the rear end wall thereof vfor accommodating the linger-piece I4 of the trigger.

The receiver indicated generally at I5 comprises a substantially-cylindrical member preferably formed from a suitable length of tubular steel stock open at its opposite ends. The interior of the receiver constitutes a cylindrical chamber I6 for the action or breech-bolt I1 of theY firearm; and a cylindrical sleeve-portion I8 rearwardly of the chamber I6 in which is secured ythe end-closure or receiver-plug I9. The barrel I 3 isV threaded or otherwise xedly secured in the forward end of the receiver. As indicated clearly in Fig. 1, in this type of firearm the action-chamber I6 comprises a rearsection 20 and a forward section. 2l, the latter being of relatively small internal diameter and formed by securing a substantially-cylindrical bushing 22 of relativelythick wallfsection in the forward open end vof the receiver. The ,breech-bolt I1 is likewise formed of twosections of different diameters correspondend of thering-pinand which also chamberslthe forwardend ofthe action-spring 21 and theA forvthe sear to disengage the nose 33 Wardly-projecting end of the firing-plunger 28 is adapted to be held in its retracted cocked position, as shown in Fig. l, against the force of the compressed spring by a sear 3G which is pivotally mounted on a transverse pivot-pinii in Va longitudinal groove formed in the underside of the receiver-plug i9 and is biased by a scar-spring 32 normally to engage its nose against a shoulder 3@ of the firing-plunger 28 to hold the latter in its cocked position. By withdrawing the nose 33 of the sear out of engagement with the shoulder 3d of the ring-plunger, the latter will be released and thrust forwardly by the force of the compressed spring 29 into engagement with the rear end of the firing-pin 2li.

For a more detailed description of the firingplunger and end-plug assembly, reference maybe.

made to my copending application Serial No. 788,529, filed November 28, 1947. The underside of the receiver is provided withra substantiallythe rear end-portion of the stock-recess Il by a ,A

substantially-shaped bracket 31th@ bottom or' which is secured to the bottom of the stock-recess by a pair of screws and is slotted longitudinally to accommodate the linger-piece M of the trigger.

The finger-piece constitutes a substantially-solid piece, the upper end of which is welded or similarly secured between inturned fdanges 353Y formed on the bottom edges of a pair of spaced parallel Ysheet-metal trigger-arms 3S, the forward ends of which are pivotally secured by pivot-pins lil in v'juxtaposition to the corresponding inner walls of -the bracket Si and adjacent the upper edges V,as hereinafter described.

The term anti-doubling as used herein and in the appended claims is a well-known expression in the art for denoting the functional characteristics of mechanism of a self-loading rearm for positively preventing more than one shot from being fired with a single pull of the trigger. In general, the anti-doubling means of the present invention comprises two principal elements, namely, a transmitting-member indicated generally at ifi and a resilient disconnector indicated generally at 65, the transmitting-member being adapted to transmit the motion of the trigger to the disconnector and the'latter, in turn, being adapted by flexure to transmit a lifting motion to of the latter from the shoulder @Il of the firing-plunger, but only lwhen the breech-bolt is in battery, that is to say, in breech-closing position. y

Referring more especially to Figs. l and 9,.the transmitting-member ill may be fabricated from solid stock, but preferably is formed from stiff sheet metal for greater economy, and comprises an elongated substantially-rectangular member having a top-plate i5 and two depending side walls il at Substantially right angles thereto, the

tY forward ends of which are provided with axiallyaligned transverse apertures 433. An inturned 'a-nge d is provided on the lower edge of each side wall adjacent its rear end and at substantialiy right angles thereto to form transverse bearing-surfaces adapted to be engaged by the aforesaid transverse bridge-member i2 of the trigger. immediately forwardly of the inturned flanges of each side wall di is a clearance-recess formed in the lower edge of each side wall for accommodating the transverse pivot-pin 5I of the manually-operated safety indicated generally at and described in detail below.

The top-plate fiof the transmitting-member is provided adjacent its rear end with a longitudinal axially-aligned substantially-rectangular slot 53 for accommodating an element of the safety, as hereinafter described; and immediately forwardly of the slot 53 is a .substantiallysquare slot which is offset laterally from the longitudinal axis of the top-plate i5 such that its longitudinal inner edge is substantially in axial alignment with the longitudinal axis of the topplate. Formed integrally on the innei1 edge of the square slot 5d, preferably by bending up a sheet metal tongue produced in stamping out the slot 5d, is an upwardly-projecting lifting-lug 55. The latter is made substantially-L-shaped in cross section, as shown especially well in Fig. 9, so as to provide a flat beveled surface 55 which extends transversely to the right of the inner edge of the slot dfi and makes a slight angle vertically to the horizontal plane of the top-plate i6 of the Vtransmitting-Inember. in' the present embodiment, the aforementioned vertical angle ofthe beveled surface 56 is of the order of three degrees. As indicated clearly in Fig. i, the lifting-lug 55 is substantially intermediate the opposite ends of the transmitting-member. Forwardly of the lifting-lug and between it and the front end of the transmitting-member is an integral leaf-spring which comprises a truncated-shaped strip of metal stamped from the top-plate t@ and bent upwardly therefrom about its base, the forward end of the leaf-spring being elevated above the horizontal plane of the top-plate and bent over slightly to provide a convex bearing-surface 58. Although the lifting-lug 55 and the leaf-spring 5l are, for economical reasons, formed from bent-up stock of the transmitting-member, it will be appreciated that these elements may be formed separately and secured to the top-plate of the transmitting-member in any suitable manner. The forward edge of the top-plate it is provided with a concave recess to allow clearance for the pivot-post of the disconnector in assembling the latter in the receiver of the firearm, as described below.

The transmitting-member 4313 is adapted to be pivotally mounted in the trigger-plate 35 by passing a pivot-pin 59 through the transverse axially-aligned apertures i3 in the side walls i? Vor" the transmitting-member and corresponding apertures in the side walls of the trigger-plate. The transmitting-member is supported thus for pivotal movement in the vertical plane of the trigger-plate, the rear end of the transmittingmember being free and adapted to extend over the bridge-member Li2 of the trigger and to be supported thereon by engagement of its inturned flanges i9 with the blister d3 thereof. Moreover, the rear end of the transmitting-member is held down resiliently in contact with the latter by the force of the leaf-spring 5l which is under slight -asea'sia compression due to engagement of its bearingsurface 58 against the underside of the receiver. As a further consequence of this construction, the leaf-spring also constitutes resilient means for holding the trigger 36 in its normal forward position and for returning the trigger to its normal position after having been retracted for discharging the rearm. As stated above, the rear end of the transmitting-member is normally supported by the bridge-element of the trigger, but if in disassembling the firearm or for any other reason the trigger should be removed., then the rear endof the transmitting-member would rdrop down and be supported on the transverse pivotpin 5| of the safety by engagement of the bottom edges of the clearance-recessesV 5i! therewith.

The safety comprises the aforesaid pivot-pin 5l which is pivotally supported at its opposite ends in transverse axially-aligned apertures in the depending walls of the trigger-plate 35 and provided with a at 5U extending from substantially the middle thereof to its right-hand end, as seen clearly in Fig. 6. This end of the pivotpin is reduced in diameter to provide a trunnion Si and a substantially-square shoulder 52, the latter being adapted to abut against the inner face of the corresponding wall of the trigger-plate to prevent transverse movement of the pivot-pin to the right, as seen in Fig. 6. The opposite or left-hand end of the pivot-pin 5 Iv extends through the corresponding wall of the trigger-plate and has a manually-operated Ahandle 63 secured thereto for rotating the pin. Mounted by a sliding fit on the atted portion of the pin 5! and abutting against a shoulder 64 formed by the flat is a safety-arm S5 having an apertured hub 66, the aperture of which is formed with a transverse cord adapted tocooperate with the hatr 6B of the pivot-pin 5l to lock the arm against rotation thereon. A cotter pin 61 or the like is inserted in a diametrical apertureof the pivotpin in juxtaposition to the right-hand face of the safety-arm to secure the latter from moving transversely thereon. Mounted on the left-hand end of the pivot-pin 5I between the corresponding wall of the trigger-plate and the left-hand face of the-safety-arm 55, is a coil-spring 68 which, when assembled thusly on the pivot-pin, is underslightV compression, as a consequence of which the entire safety assembly, including the pivot-pin 5I, operating-handle 63 and safety arm 65, is urged to the right, thereby taking up any slack between the respective members ofthe safety assembly and holding a knob 69 of the operating-handle in rm frictional engagement with the adjacent wall of the receiver whereby the safety-arm 65 is successfully held in its on and foif positions. A A

rIhe safety-arm 65 is adapted to project up through the longitudinal slot 5,3 of the transmitting-member and to be moved into and out of engagement with the underside of the sear Si) rearwardly of its pivot-pin for locking and unlocking the latter, the forward and rearward movements of the safety-arm corresponding to its on and oif positions, being limited by engagement with the front and rear ends respectively of the slot 53.

Referring now to Fig. 8,v thedisconnector 45 comprises a relatively-thin flat strip of metal having a pivot-post 'IU fastened to the underside thereof intermediate its opposite ends. VThe forward end ofthe disconnector is provided with a cam-lug 1| which comprises, in the preferred embodiment, a lip or flange 12 which is bent upwardly from a rearwardly-extending bevel formed at the forward end of the disconnector and substantially perpendicular to the top lsur,- face thereof, and appendage 13 being bent inwardly lacross the left-hand edge of the disconnector. The front face of the upturned lip 12 forms a substantially-flat rearwardly-extending cam-surface 14. It will be understood, of course, that the cam-lug may be formed separately and welded or otherwise secured to the top of the disconnector, but the flange and appendage construction described above is by far the most economical construction.

VThe rearwardly-extending reach of the disconnector is resilient and provided with a step comprising a depending-riser 'l5 and a tread 16 extending rearwardly therefrom and in a plane substantially parallel to the top surface of the disconnector. Formed on the underside of the tread is a depending block-like member 'I1 whichis preferably constructed by curling under an extension of the rear end of the tread to form ahollow substantially-rectangular-shaped connectorblock. It will be understood, however, that the latter may constitute a separate solid member suitably fastened to the underside of the tread. In accordance with an additional purpose ofcthis invention,v the underside of the connector-block is provided with a substantially-fiat beveled yface 1S, the transverse axis of which makesan angle of* substantially 3 tothe vertical which corresponds to the slope of the at beveledsurface 456 of the lifting-lug 55. -v

The disconnector is adapted to be supported within the receiver of the firearm between the sear 3D and the transmitting-member 44 with the cam-lug 'H at the forward end of the disconnector extending beneath the breech-bolt l1. The operation of the disconnector for selectively connecting and disconnecting the transmittingmember 44 to the sear 3B isreifected by the breechbolt inV accordance with its position in the chamber of the receiver. To this end, the bottom of the breech-bolt (see Fig. 7) is formed with a narrow substantially straight cam-groove 19 which extends longitudinally thereof in the vertical plane of its longitudinal axis, the width of the cam-groove 19 being only slightly greater than the transverse dimension ofthe cam-lug 1|. The rear end of the cam-groove 19 is provided onV its left-hand side, as seen in Figs. 2 and 3, with a beveled inner edge SEI which extends outwardly and rearwardly at an angle corresponding to that of thev cam-surface ld of the disconnector and is adapted to be cooperatively engaged thereby, 1'n

the manner and for the purpose hereinafter described. The support for the disconnector 45 comprises the aforesaid pivot-post 'l0 which projects down through a bushing 8| secured inthe bottom of the receiver, the bushing being provided at its upper end with a flanged head 82 on which the disconnector is supported at a predetermined elevation within the receiver such that its cam-lug H will ride in the cam-groove 79 in the underside of the breech-bolt and the tread 16 at the rear end of the disconnector will engage the underside of the sear 3B forwardlyv of its pivotpin. The. disconnector is thus interposedr between the sear and the transmitting-member with the connector-block Il of the disconnector` lying in a horizontal plane above the plane of theliftinglug of the transmitting-member. Itwill be clear that the vertical pivot-postlll supportsthe disconnector for oscillation in a horizontal plane withinV the receiver and that its rotation counterclockwise such as to bring the connector-block 11 into its right-hand position, as shown in Fig. 4 and hereinafter referred to as its normal position, is limited by engagement of the cam-face 14 of the lug 1I with the beveled edge 8D of the camgroove 19. In its normal position, the connectorblock 11 of the disconnector is immediately above the lifting-lug 55 of the transmitting-member. Hence, when the latter is elevated, its lug 55 will engage the connector-block 11 and flex the resilient rearwardly-extending reach of the disconnector upwardly. At the other extreme of its movement, hereinafter referred to as its disconnecting position, the connector-block 11 of the disconnector is displaced to the left of the liftinglug 55 of the transmitting-member (see Fig. 5) to a position substantially opposite its slot 54, as a consequence of which the lifting-lug 55 will not make contact with the connector-block 11 when the transmitting-member is elevated by retraction of the trigger. The disconnector 45 is adapted to be resiliently heldin its normal position by the force of yieldable means comprising a wirespring 83 which, as shown most clearly in Figs. 2 and 3, comprises a substantially-Z-shaped midsection provided with a forwardly-extending reach 84 held in juxtaposition to the right-hand inside wall of the trigger-plate by a right-angle bent adapted to engage in an aperture thereof.

A relatively-short reach 85 extends rearwardly f, f from the Z-shaped mid-section of the spring and is engaged at its rear end in a diametrical aperture in the lower end of the pivot-post 10. Normally, the rearwardly-extending reach 85 of the 'spring acts to resiliently hold the disconnector in its normal right-hand position, as shown in Fig. 2, but whenever the disconnector is swung horizontally clockwise from its normal position t0. its disconnecting position, as shown in Fig. 3, the spring will be distorted and, hence, on removal of the force which has displaced the disconnector from its normal position to its disconnecting position, the force of the distorted spring will swing the disconnector counterclockwise back to its normal position.

The operation of the anti-doubling means may be described briefiy as follows. Assuming that the breech-bolt I1 is in battery, that is to say, is in breech-closing position, as shown in Figs. 1

and 2, then the beveled edge 88 of the cam-groove of the breech-bolt is forwardly of the cam-face 14 of the cam-lug 1I of the disconnector but substantially in contact therewith. Under these circumstances, the disconnector is resiliently held by its spring 83 in its normal position wherein its connector-block 11 is immediately above the lifting-lug 55 of the transmitting-member. Assuming further that the safety is in its off positon, as indicated in Fig. l, then on retracting the iinger-piece I4 of the trigger for discharging the firearm, the bridge-member 42 of the triggerarms 39 will be elevated, lifting the rear end of the transmitting-member so as to move the liftinglug 55 thereof up against the underside of the connector-block 11 of the disconnector. The consequent upward force exerted against the connector-block flexes the resilient rearwardly-extending reach of the disconnector upwardly in a vertical plane, whereupon the tread 16 of the disconnector elevates the forward end of the springbiased scar to withdraw its nose 33 out of engagement with the shoulder 34 of the firingplunger 28. The firing-plunger is thus released and thrust forwardly forcefully by the force of its compressed spring 29 to strike the firing-pin 24 and discharge the cartridge in the chamber of the barrel. Following the discharge of the cartridge and the subsequent rearward movement of the breech-bolt I1 in the chamber of the receiver for reloading and rearming the fire arm, the beveled edge of the breech-bolt cam-groove moves rearwardly relative to the cam-face 14 of the camlug 1I and in so doing displaces rthe latter inwardly into alignment with the cam-groove 19, the disconnector being swung clockwise, as seen in Fig. 2, against the resistance set up by distorting the spring 83, whereupon the cam-lug 1I enters the longitudinal cam-groove 19 of the breech-bolt, as shown in Fig. 3. As a consequence of this movement, therear end of the disconnector, and more especially its connector-block 11, will be displaced to the left of the lifting-lug 55 of the transmitting-member thereby disconnecting the transmitting-member and the disconnector. Moreover, the latter will be held in its disconnecting position throughout substantially the entire rearward and forward excursion of the breech-bolt and until the latter has again returned to battery. It will be manifest, therefore, that as long as the breech-bolt is out of breechclosing position, a rearward pull on the fingerpiece I4 of the trigger would be ineffective for letting off the sear. Thus, the firearm will automatically rearm and will remain cocked until the breech-bolt hasV returned to battery and the trigger again pulled to fire a second shot. Moreover, even though the trigger were held retracted following the discharge of the firearm and the subsequent return of the breech-bolt to battery, the upward displacement of the lifting-lug 55 of the transmitting-member would effectively prevent the connecting-block 11 of the disconnector from moving back to its normalposition above the lifting-lug of the transmitting-member until such time as the latter had been lowered by releasing the trigger. That is to say, there must be a conscious release of the trigger following each discharge of the firearm before a second shot may be fired. O'n return of the breech-bolt into battery, the beveled edge 88 of the cam-groove 19 will again be located forwardly of and substantially in contact with the cam-face 14, as a consequence of which the stressed wire-spring 83 of the disconnector will return the latter to its normal position for re-engagement with the transmitting-member.

It should be pointed out that engagement of the lifting-lug 55 of the transmitting-member with the connector-block 11 of the disconnector is effected by mutual engagement of the respective flat beveled surfaces 56 and 18 thereof, each of which is formed at an angle of substantially 3 to the vertical. This construction is preferred for facilitating disengagement and re-engagement of these respective surfaces and more especially for taking up wear therebetween so as to constantly hold a close tolerance. Mutual engagement between the cam-surface 14 and the beveled edge 88 of the cam-groove 19 causes these surfaces to wear and since the force of the spring 83 is acting on the disconnector to rotate the latter in a counterclockwise direction as seen in Fig. 2, the connector-block will move to the right relative to the lifting-lug 55, as seen in Fig. 4, whereby the beveled surface 56 of the latter will engage further up on the beveled surface 18 of the connector-block thereby automatically compensating for wear and holding a close tolerance between the beveled surfaces of the lifting-lug and of the connector-block.

The improved anti-doubling device of this invention provides a durable, extremely simple and relatively inexpensive mechanism which occupies a minimum of space in the firearm and which is positive in its action, these and other advantages and improvements of the device being obtained through the expeditious use of materials and design whereby each element of the device performs several functions.

The invention may be carried out in other speciic ways than those herein set forth without departing from the spirit and essential characteristics of the invention, andthe present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaningand equivalency range of the appended claims are intended to be embraced therein.

I claim:

, 1.'In -a self-loading firearm a receiver; a breech-bolt reciprooable in said receiver; firing-means mounted-in said breech-bolt; a spring-biased sear adapted normally to coact with said firing-means to hold said iiring-means in cocked position; a trigger; and anti-doubling means interposedbetween said trigger and said sear and arranged normally, that is to say, only when said breech-bolt is in battery to actuate said sear and releasel said cocked ring-means in response to retraction of said trigger, said anti-doubling means comprising a transmittingmember, an element arranged to support said transmitting-member for displacement vertically by retraction of s aidtrigger, avdisconnector, an element arranged substantially perpendicularly to the supporting-element-oi said transmittingmember to support said disconnector between said transmitting-member and said sear for displacement horizontally to and from operative relationship with said transmitting-member and said sear, and an element carried by said disconnector and yieldable substantially vertically with respect thereto for engagement with said transmitting-member and said sear thereby to actuate said sear and release-said cocked nringmeans in response to displacement of said transmitting-member by said trigger.

2. In a self-loading firearm a receiver; a breech-bolt reciprocable in said receiver; firingmeans mounted in said breech-bolt; a springbiased sear adapted normally to coact with said nring-means to hold said tiring-means in cocked position; a trigger; and anti-doubling means interposed between said trigger and said Sear and arranged normally, that-is to say, only when said breech-bolt is in battery to actuate said sear and release said cocked ring-means in response to retraction of-said trigger, said antidoubling means comprising a transmitting-member, an element arranged to support said transmitting-member for-displacement vertically by retraction of said trigger, a yieldable-element interposed between said transmitting-member and .said receiver to hold said transmittingmember in contact with said trigger and normally to hold said trigger in its unretracted position, a disconnector, an element arranged to support said disconnector between said transmitting-member and; said Sear Vfor displacement horizontally to and -irom operative relationship with said transmitting-member and said sear, and a yieldable-element arranged normally kto hold said disconnector in operative relationship with said transmitting-member and said sear thereby to actuateysaidffsearand releasesaid cocked firing-means in response to displacement off-said transmitting-member by said trigger.

3. In a self-loading firearm a receiver; a breech-bolt reciprocable in said receiver; firingmeans mounted in said breech-bolt; a springbiased sear adapted normally to coact with said iiring-means to hold said iiring-means in cocked position; a trigger; anti-doubling means inter-` a connector-element carried by said disconnec-f.

tor and yieldable substantially vertically with respect thereto, and ayieldable-member arrangednormally to hold the said connector-element ofP said disconnector in operative relationship with said transmitting-member and said sear therebyto actuate said sear and release said cocked iiring-means in response to displacement of said.

transmitting-member by said trigger; and a camgroove in said breech-bolt arranged to coact with' the cam-lug of said disconnector when said breech-bolt is out of battery to move the said connector-element of said disconnector out of operative relationship with `said transmitting-- member against the resistance of said yieldableelement so as to prevent the release of said cocked iiring-means in response to displacement oi said transmitting-member by said trigger.

4. In a self-loading rearm a receiver; a breech-bolt reciprocable in said receiver; firing.- means mounted in said breech-bolt; a springbiased sear adapted normally to coact with said firing-means to hold said firing-means in cocked position; 4a trigger; and anti-doubling means interposed between said trigger and said Sear and arranged normally, that is to say, only when said breech-bolt is in battery to actuate said sea'r and release said cocked firing-means in response to retraction of said trigger, said anti-doublingl means comprising a transmitting-member arranged to be displaced upwardly substantially vertically by retraction of said trigger and a dis connector arranged to be supported between said transmitting-member and said sear for pivotal movement in a horizontal plane said disconnector vhaving a resilient. arm located normally immediately above said transmitting-member whereby as the latter is Adisplaced upwardly by said trigger said transmitting-member engages and ilexes said resilient arm upwardly into conm tact with said sear to actuate said sear and release said cocked firing-means. c y 5. In a self-loading rearm a receiver; a breech-bolt reciprocably mounted in said receiver; ring-means mounted in said breecll-` bolt; a spring-biased sear Vadapted normally to coactv withsaid firing-means to hold said firingmeans in cocked position; a trigger; and antidoubling means interposed between `said trigger and said sear and yarranged normally, that is to say, only when said breech-bolt is in battery to. actuate `said-Sear Vand release said cocked firingraeanain response t0. retragton .0f Saidtrgeerla said anti-doubling means comprising a transmitting-member pivotally supported at its forward end in said receiver for ysubstantially-vertical movement, the rear end of said transmittingmember being supported on said trigger and elevated thereby when said trigger is retracted, and a disconnector supported intermediate its opposite ends in said receiver on an aXis substantially perpendicular to the pivotal supportingmeans of said transmitting-member for substantially-horizontal movement between said transmitting-member and said sear said disconnector having a resilient arm provided with a connector-element Varranged normally to overlie said transmitting-member whereby as the latter is displaced upwardly by said trigger said transmitting-member engages and flexes the arm oi?r said disconnector upwardly thereby to move said connector-element into contact with said sear to actuate said sear and release said cocked firing-means.

` 6. 1n a self-loading rearm a receiver; a breech-bolt reciprocably mounted in said `re ceiver; firing-means mounted in said breechbolt; a spring-biased sear adapted normally to coact with said firing-means to hold said firingmeans in cocked position; a trigger; anti-doubling means interposed between said trigger and said sear for actuating said sear so as to release said cocked firing-means in response to retraction of said trigger comprising a transmittingmember pivotally supported at its forward end in said receiver for substantially-vertical movement, resilient means carried by said transmittingmember arranged to coact with said receiver to hold the rear end of said transmitting-member in engagement with said trigger thereby to hold said trigger normally in its unretracted position, and a resilient disconnector supported intermediate its opposite ends in said receiver for substantially-horizontal movement between said transmitting-member and said sear said resilient disconnector being arranged normally to overlie said transmitting-member whereby as the latter is displaced upwardly by said trigger said transmitting-member engages and nexes said resilient disconnector upwardly into contact with said sear to actuate said scar and release said cocked ring-means; and means carried by said breechbolt arranged to coact with said flexible disconnector when said breech-bolt is out of battery to displace said disconnector out of alignment vertically with said transmitting-member so as to prevent ie actuation of said sear and release of said cocked firing-means in response to theY elevation of said transmitting-member by said trigger.

7. In a self-loading firearm a receiver; a breech-bolt reciprocably mounted in said receiver; firing-means mounted in said breechbolt; a spring-biased sear adapted normally to coact with said firing-means to hold said iiringmeans in cocked position; a trigger having a transverse bridge-element; anti-doubling means interposed between said trigger and said sear for actuating said sear so as to release said cocked firing-means in response to retraction of'said trigger comprising a transmitting-member having an upwardly-projecting lug intermediate its opposite ends, a transverse pivot engaged in the forward end of said transmitting-member and arranged to pivotally support the latter for substantially-vertical movement in said receiver, and resilient means carried by said pivoted transmitting-member arranged to hold the rear end thereof down in contact with said trigger bridgeelement thereby to hold said trigger normally in its non-retracted position, a resilient disconnector interposed between said transmitting-member and said sear, said disconnector having a vertical pivot-post intermediate its opposite ends arranged to pivotally support said disconnector for substantially-horizontal movement in said receiver, a depending-block at the rear end of said disconnector, a cam-lug at the forward end of said disconnector, and a spring connected to said vertical pivot-post to bias said disconnector in a horizontal position such that said depending-block is normally immediately above the upwardly-projecting lug of said transmitting-member, said trigger bridge-element Ybeing arranged to engage the rear end of saidv transmittingmember and elevate its upwardly-projecting lug into engagement with said depending-block on retraction of said trigger to flex said resilient disconnector upwardly thereby to actuate said sear and release said cocked ring-means; and a cam-groove in the underside of said breechbolt arranged to coact with the cam-lug of said disconnector when said breech-bolt is out of battery to displace the depending-block of Said disconnector out of alignment vertically with the upwardly-projecting lug of said transmittingmember so as to prevent the actuation of said sear and release of said cocked firing-means in response to the elevation of the rear end of said transmitting-member on retraction of said trigger.

8. In a self-loading rearm a receiver; a breech-bolt reciprocably mounted in said receiver; firing-means mounted in said breechbolt; a spring-biased sear adapted normally to coact with said ring-means to hold said ringmeans in cocked position; a trigger having a transverse bridge-element; anti-doubling means interposed between said trigger and said sear for actuating said sear so as to release said cocked ring-means in response to retraction of said trigger comprising a transmitting-member having an upwardly-projecting 1ug intermediate its opposite ends and provided with a verticallybeveled top surface, a transverse pivot engaged in the forward end of said transmitting-member and arranged to pivotally support the latter for substantially-vertical movement in said receiver, and resilient-means carried by said pivoted transmitting-member arranged to hold the rear end thereof down in contactwith said trigger bridge-element thereby to hold said trigger normally in its non-retracted position, a resilient disconnector interposed between said transmitting-member and said sear said disconnector having a vertical pivot-post intermediate its opposite ends arranged to pivotally support said disconnector for substantially-horizontal movement in said receiver, a depending-block at the rear end of said disconnector having a verticallybeveled bottom surface, a cam-lug at the forward end of said disconnector, and a spring connected to said vertical pivot-post to bias said disconnector in a horizontal position such that said depending-lug is normally immediately above the upwardly-projecting lug of said transmitting-member, said trigger bridge-element being arranged to engage the rear end of said transmitting-member and elevate the verticallybeveled top surface of its upwardly-projecting lug into engagement with the vertically-beveled bottom surface of said depending-block to flex said resilient disconnector upwardly thereby to actuate said sear and release said cocked firingmeans; and a cam-groove in the underside of said breech-bolt arranged to coact with the camlug of said disconnector when said breech-bolt is out of battery to displace the depending-lug of said disconnector out of alignment vertically with the upwardly-projecting lug of said transmitting-member so as to prevent the actuation of said sear and release of said cocked firingw means in response to the elevation of the rear end of said transmitting-member on retraction of said trigger.

9. In a self-loading rearm a receiver; a breech-bolt reciprocably mounted in said receiver; ring-means mounted in said breechbolt; a spring-biased sear adapted normally to coact with said firing-means to hold said firingmeans in cocked position; a trigger; a safety comprising an arm constructed and arranged to be manually moved into engagement with said sear to prevent disengagement thereof from said cocked firing-means; and anti-doubling means interposed between said trigger and said sear for actuating` said sear so as to release said cocked firing-means in response to retraction of said trigger comprising a transmitting-member having a slot to accommodate the arm of said safety, the opposite ends of said slot constituting abutments to limit the forward and rearward movements of said safety, said transmitting-member being pivotally supported at its forward end in said receiver for substantially-vertical movement therein, and a resilient element arranged to hold the rear end of said transmitting-member in engagement with said trigger so as to be elevated thereby when said trigger is retracted, and a resilient disconnector pvotally supported intermediate its opposite ends in said receiver between said transmitting-member and said sear for substantially-horizontal movement therebetween, said resilient disconnector being arranged normally to overlie said transmitting-member and to be engaged and deflected upwardly thereby when said trigger is retracted thereby to engage and actuate said sear and release said cocked ring-means.

THOMAS R. ROBINSON, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,403,133 Stokke Jan. 10, 1922 2,037,065 Burton Apr. 14, 1936 2,242,496 Williams May 20, 1941 2,267,078 Burton Dec. 23, 1941

Images