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Publication numberUS2584299 A
Publication typeGrant
Publication dateFeb 5, 1952
Filing dateJul 15, 1948
Priority dateJul 15, 1948
Publication numberUS 2584299 A, US 2584299A, US-A-2584299, US2584299 A, US2584299A
InventorsSefried Harry H
Original AssigneeOlin Ind Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fire-control mechanism for firearms
US 2584299 A
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Description  (OCR text may contain errors)

Feb. 5, 1952 Filed July 15, 1948 H. H. SEFRIED, 1: 2,584,299.

FIRE CONTROL MECHANISM FOR FIREARMS 5 Sheets-Sheet 1 Feb. 5, 1952 H. H. SEFRIED, II

FIRE CONTROL MECHANISM FOR FIREARMS 3 Sheets-Sheet 2 Filed July 15, 1948 mz/eniar W 9:. I @y 1952 H. H. SEFRIED'JII 2,584,299

FIRE CONTROL MECHANISM FOR FIREARMS 5 Sheets-Sheet 5 Filed July 15, 1948 V 11.0w 2? k1 Patented Feb. 5, 1952 FIRE-CONTROL MECHANISM FOR FIREARMS Harry H. Sefried, II, New Haven, Conn., assignor to Olin Industries, Inc., New Haven, Conn., av

corporation of Delaware Application July 15, 1948, Serial No. 38,817

7 Claims.

The present invention relates in general to firearms and more especially to improvements in fire control mechanisms for bolt-action firearms.

An object of the invention is to provide a boltaction firearms with fire-control mechanism of superior durability and reliability.

A further object of the invention is to provide a superior fire-control mechanism for bolt-action firearms wherein the trigger-pull is characterized by it uniformity, smoothness of operation and substantially imperceptible movement.

Astill further object of the invention is to provide a superior fire-control mechanism for bolt-action firearms wherein a movement-multiplying lever mechanism is interposed between the trigger and sear, whereby substantially imperceptible movement of the trigger will sufiice to transmit relatively large movement to the sear for releasing the firing-plunger. V

A still further object of-the invention is to provide a bolt-action firearm having a springactuated firing-plunger with fire-control mechanismincluding a sear which is arranged normally to hold the firing-plunger in cocked position but which, when released, is urged out of engagement with the firing-plunger by the force of the firing-plunger spring.

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 said disclosure which are novel over the prior art.

7 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 an upturn and pull-back bolt-action firearm embodyingthe present invention, with the stock and associated parts omitted;

Fig. 2 is a broken end elevation on section line 2'-2 of Fig. 1 showing the position of the boltoperating handle when the breech-bolt is in its locked position and the firing-plunger cocked, as shown in Fig. 1;

Fig. 3 is a broken side elevation in section of the firearm of Fig. 1 showing the relative positions of the elements of the fire-control mechanism following release of the firing-plunger;

Fig. 4 is a broken end elevation in section on line 4-4 of Fig. 3;

Fig. 5 is a broken side elevation of the firearm Fig. 7 is a perspective view of the sear of the fire-control mechanism of this invention;

Fig. 8 is a perspective view of the sear-latch of the fire-control mechanism;

Fig. 9 is a perspective viewof the transmittingmember of the fire-control mechanism of this invention; and

Fig. 10 is a perspective view of a modification of the fire-control mechanism of this invention including a broken portion of the firing-plunger.

The particular firearm herein chosen for illustrating the present invention is of the so-called upturn and pull-back bolt-action type, and includes a receiver l5 of substantially-tubular form provided at its forward end with an interiorlythreaded aperture for receiving the rear end of a barrel l6 having a cartridge-chamber I'l therein. The receiver 15 is also provided with an axial bolt-receiving passage [8, the forward upper portion of which is intersected by a loading-andejection opening [9.

Mounted in the bolt-receiving passage [8 of the receiver IS with capacity for reciprocation therein, is a cylindrical bolt 20 having an axial firingplunger passage 2|. therein intersected at its forward end by a relatively small substantially-conical eccentric passage 22. Projectable through the said passage 22 is the firing-point 23 of a firing-plunger 24 mounted in the passage 2| of the bolt 20.

The rear portion of the firing-plunger 24 is of tubular form in cross section and provides a fir;-

ing-spring chamber 25 adapted to receive a firing showing the manually-operated safety-lever for Y 3 locking and releasing the sear-latch of the fire- ;control mechanism;

spring 26 which thrusts at its forward end against the front wall 21 of the firing-spring chamber 25. The rear end of the firing-spring 26 is' seated against a pin 28 securely mounted in and extending transversely through the reduced cylindrical rear-end portion 29' of the bolt 20. The pin 28 is adapted to extend through longitudinal clearance-slots 30, respectively formed in the top and bottom walls of the rear tubular portion of the firing-plunger 24 so that the said firing-plunger may reciprocate in the longitudinal passage 2| of the bolt 20 independently thereof, but at the same time be prevented from rotative movement with respect thereto.

As shown, the rear end of the firing-plunger 24 may be provided with a head 3| having forwardly-extending nibs 32 adapted to enter complementary notches 33 in the rear end of a boltoperating sleeve 34 which is mounted for capacity for turning movement upon the reduced cylindrical rear-end portion 29 of the bolt 20, the boltoperating sleeve 34 being provided with an integral laterally ofiset handle 35 terminating in a ball-grip 36.

a sear-nose 4!] vertically upstanding from the:-

forward end of a pivotal sear 4|. The sear 4! is pivotally mounted adjacent its rear end bymeans of a transverse pivot-pin 42 in the vertical passage 43 (see Fig. 2) of a trigger-plate member; indicated generally at 44. Thelatterrcomprises two substantially-rectangular side-plates 45 and 46 held in spaced-parallel relationship bytransverse spacer-beads 41 secured'by rivets 48' between the lower edges of the plates, as -shownin Fig. and a spacer-block 49 mounted therebetweenadjacent the upper rear corners of the plates; the block 49 ihavinga vertical internallythreaded" aperture 50 for the: purpose hereinafter described. The trigger-plate-member '44 is adaptedto be'secured at its upper end in a vertical aperturel inzthe bottom1of the receiver by means of a screw 5| which is mounted in an aperture 52- in the rear end of the -receiver and engaged iin the internally-threaded aperture 50 irr the rear end ofithe spacer-block; .and by, an

assembly-pin 53 extendingitransversely through the bottom-of the receiver andthrough aligned aperturesin the upper edges of-the trigger-plate. As'shown especially well inrFigs. 1, 3 -and 4, the assembly-pin 53 extends through an aperture #54 in the sear 4!, the diameter of the'aperture-54 being greaterthan the diameter of the pin 53 Wherebythe sear is enabled to pivot freely: about its =pivotpin 42in a vertic'al planeswithin limits definedby the di'ameter'or the aperture 54. As shown especially well in Figs; 1 ands; the :searnose'49 bf thesear is adaptedto'proj ect upwardly through a longitudinal clearance-slot 55' in the underside of the-bolt, for engagement ofits sub-'- stantially-vertical rearwardly-facing shoulder'3'9 with the forwardly-facing cocking-shoulder"38 of" the"firing-'plunger 24; the sear-nose 40*being forwardly 'ofth'e pivot-pin" -42 of thesear and the assembly-pin 53 of the trigger-plate: Depending from the sear rearwardly of its pivot=pin-"42 is an integral 'lever-arm'iliwhi'ch is disposed at an" angle to thelongitudinal axis of "the sear and is"a'dap1ted"tobe 'eng'aged'b'ya fingerof the trigger for loweringthe' sear-nose-Ml out of "the clearance=slo-t '55 of the bolt; for the purpose hereinafter described.

Formed "on'the underside '01" the sear forwardly of its pivotpm 42 and" immediately rearwardly of its transverse aperture" 54, is an arcuate substantia11yvertica1 recess 51 'which' is adapted to accommodate theupper' end of "the resilient upper arm 58"of a safetyr-p'in type spring; indicated generallyat 59, the "eyeof which may be engaged on a transverse pin" 60 mountedin the'trigger plate forwardly of the sear pivot-pin 42 and rearwardly of the recess 51'of the sear. The lower arm BI of the spring 59 extends forwardly and is engaged at its forward extremity over one of the spacer-beads 41 of the trigger-plate; As

a-consequence of this construction,.theupper I arm..58'of"the spring 59'exerts-a constantlforce against the underside of th'e sear forwardly. of its pivot-pin 42, normally. to hold'thesear-nose 40in an elevated position; Formed integrally on the-bottom forward corner of thesearand rearwardly of the front edge of the sears-nose 41 1s a forwardly-projecting sear-lug 62, the lug being trigger-plates 44L rectang-u-lar rearwardly-facing notch 65 formed in the rear edge of a sear-latch 6 6. The latter is-:pivota-ll-y. supported at its upper end in the trigger-plate 44 by; a transverse pivot-pin 61 so as tozswingxinathe vertical passage 43 thereof, the bottom edge 68 of the sear-latch being arcuate' and'intersecting the lower end of the front-fedge of the sear-latch to form a sharp corner or toe 69.

Thetoe [illof the sear-latch is adapted normally to engage againstthe rearwardly-facing shoulder 10 01" -a transmitting-member 1| which comprises a lever pivoted at itsrear end in the passage 43 of the trigger-plate bya transverse pin 12 for vertical swinging movement therein, its shoulder 10 being normally heldup resilientlygin the pathdof the toe'69 of the searlatch by. means of a coil-spring 13;- The (latter is sup ported in thebottom 'of the trigger-plate passage 43 on theupwardly-projecting; pilot I4 ofwa spring-tensioning screw 15 threadedlyzsecured therein, the upper endof the springTB-engaging in a -recess in the underside of the transmittinglever. A second.- screw 16"is threadedly mounted in .the'bo'ttom of the passage 43=0f the trig er.- .plate 44 forwardlyof the spring-tensioning screw 15 for vertical adjustment therein, its :upper end being disposed immediately, beneath the under! side ofthe transmitting-lever" 1| forwardly, of .its pivotl'2 to limittthei downward .or clockwise swinging vmovement thereofi A thirdadjusting: screw is shown at '11 similarly mounted in the vertical :passage 43 of the-trigger-plate and at the forward extremity thereof for vertical adjustment therein,- the screw-11 carryingza spring.- pilot 18 at its upper end on w-hichis mounted a buffer-spring 19. The upper endofthe latter engages :against a fixedstop -8 0 at the upper end of -the pilot 18, while the .lower end of the spring engages-against awasher. 8i mounted..for vertical movement on the pilot 18; ,the- Washer 84 being of.- a diameter suchas to overlie the upper forward corner. of the-'transmitting-lever 1| so as to restrain or dampen the upward movement thereof, for the purpose hereinafterv described.v

Formedron therupperedge of .the transmittinglever 1i at its rear end, .iszanaintegral upwardly, projecting knee-82,: the-back. edgeof which slopes upwardly and forwardlyto provide a triggerengaging portion 83 thereon slightly. forward of its pivot-pin12 iorengagementby'theupper end of a finger 8401? the trigger, The trigger is indicated generally at Hand comprises a substantially-triangularv body-portion 86 having a transverse aperture adjacent the lower. end thereof and substantially intermediate its front and rear edges to receive a pin 81 for pivotally mounting the trigger in the vertical. passage. between the respective sides 45and46 of the Clearance-recesses v are provided' in=oppositersidesaoft the trigger-body 86 adjacent the upper rear cornerathereof, to. form .a web 88-. which is provided wi-thta transverse aperture rearwardly of the trigger pivot-pin. for connecting the lower end of'a trigger-spring 89 thereto. The upper end of the spring 89 is engaged on a transverse pin 90 which extends between opposite sides of the trigger-plate 44, above and rearwardly of the pivot-pin of the trigger whereby the force of the spring 89 serves to continuously urge the trigger, and more especially its finger 84, forwardly in a. clockwise direction into engagement with the trigger-engaging surface 83 of the knee 82 of the transmitting-mejmber H. Actuation of the trigger 85 is effected by means of the finger-piece 9| formed integrally or otherwise attached to the lower edge of the body-portion 86 of the trigger.

Assuming that the breech-bolt, firing-pin and fire-control elements are in their respective positions as shown in Fig. 1, wherein the breechbolt is closed and looked, as indicated by the position of the operating-handle of Fig. 2, and that the firing-plunger 24 is held in its cocked position by engagement of the sear-nose, and more particularly the substantially-vertical rearwardly-facing shoulder 39 thereof, with the transverse cocking-shoulder 38 of the firing-pin, then the force of the compressed spring 26 of the firing-pin will be directed against the substan tially-vertical shoulder 39 of the sear-nose on a substantially-horizontal line above the pivot-pin 42 of the sear, asa consequence of which a turning moment force will act on the shoulder 39 of the sear to pivot thesear in a clockwise direction.

The latter is positively held, however, from pivoting clockwise by engagement of the lower edge 64 of its lug 62 with the lower shoulder of the notch 65 in the sear-latch 66, the lower shoulder of the notch 65 being substantially perpendicular to the force transmitted thereto by the sear-lug. Moreover, since the lower shoulder of the notch 65 is below and rearwardly of the pivot-pin 61 of the sear-latch, the force exerted thereon'by the sear-lug 62 tends to rotate the sear-latch in a counterclockwise direction and consequently, with the parts in the position shown in Fig. 1, to hold the toe 69 of the sear-latch in locked engagement with the shoulder 18 of the pivoted transmitting-member H; thus, the sear is effectively precluded from disengaging the cooked firing-plunger 24.

To fire the piece, the trigger 9| is pulled rearwardly, whereupon its finger 84 exerts pressure against the knee 82 of the resiliently-held pivotally-mounted transmitting-member H, to pivot the latter in a clockwise direction and withdraw its .shoulder 16 from engagement with the toe 690i the sear-latch 66. Immediately upon release of the toe '69 of the latter, the force exerted by the sear-lug 62 on the lower shoulder of the sear-latch, swings the latter forwardly ,thereby disengaging the sear-lug therefrom,

whereupon the sear swings downward freely in a clockwise direction thereby lowering the searshoulder 39 from engagement with the cockingshoulder 38 of the firing-plunger 24. Thus, the firing-plunger is released and moves forwardly -force fully under the compression force of the firing-plunger spring 26 to fire the cartridge in the chamber ll of the barrel. Following disvcharge of the firearm, the operator will release the trigger, whereupon the force of the compressed spring 13 of the transmitting-lever, being greater than the force of the relatively-light trigger-spring 89, tends'to urge the forward end, and more especially the latching-shoulder -10 .of' the transmitting-lever, upwardly into position {Mire-engagement with thetoe of the sear-latch and to pivot the trigger-finger 9| forwardly.

However, by reference to Fig. 3 it will be seen that immediately following the discharge of the firearm, the underside of the firing-plunger rides over the upper edge of the sear-nose 40 so as to effectively hold the sear-nose in a lowered position, in which position the sear-lug 62 is displaced below the notch 65 of the sear-latch, with the front edge of the lug engaging the rear edge of the latter, whereby the latch is positively held in its forward position overlying the forward end of the transmitting-lever ll. Consequently, the

' elements of the fire-control mechanism are effecwardly on the operating-handle to move the bolt rearwardly in the receiver for extracting the fired cartridge and to permit loading a fresh cartridge into the chamber of the barrel. During the rearward movement of the bolt and firing-plunger, the undersides thereof ride off of the upper edge of the sear-nose 40 which is then free to move upwardly into the clearance-space provided in the receiver by the rearwardly-moving breech-bolt and firing-plunger, the upper movement of the sear-nose being limited by engagement of the lower edge of the clearance-aperture 54 of the sear with the transverse assembly-pin 53. With the upward movement of the sear, its lug 62, and more particularly the upper edge 63 thereof, moves up into engagement with the upper shoulder of the notch 65 in the sear-latch 66 to pivot the latter in a clockwise direction and thus retract its toe 69 to a position rearwardly of the shoulder 10 of the pivoted transmittingmember H. The latter being freed by the rearwardly-pivoting sear-latch, is then swung upwardly by the force of its compressed spring 13 to bring its shoulder 10 in front of the toe 69 of the sear-latch. The upward swinging movement of the transmitting-member H is effectively restrained by engagement of its forward end with the underside of the resiliently-held washer 8|, which acts as a buffer to prevent the transmitting-member from striking the toe 69 of the searlatch sharply and with such force as to cause the end of the transmitting-member to rebound. That is to say, by providing the buffer-means, the shoulder 10 of theftransmitting-member is moved upwardly with restraint into position for full locking engagement with the toe 69 of the sear-latch 66. Now, as the breech-bolt is adforce of the compressed firing-spring 26 acting thereon, tends to swing downwardly. However, any slight downward movement of the sear, and more particularly of its lug 62, serves to swing the toe B9 of the sear-latch forwardly into locking engagement with the shoulder I0 of the transmitting-member, as hereinabove described, whereby the sear is efiectively held up in firingplunger-cocking position. The elements of the firing mechanism are again in position for firin the firearm.

:.the breech-bolt .from- .the. receiver when. the. ,fir- .ing-pin is in its. firing. positin,:as showmin" Eig.

3,.the.sear4 l. is provided with the aforementioned downwardly and 1-. rearwardly depending lever- .arm 5E,.the:lower extremity of-Whichisadapted to engage against. thebacisedge. of. the triggerfinger 84. .Thus by. pulling forwardly. on .;the

finger-piece 9 I of. the. trigger, the finger portion 84. thereof is pivoted; upwardly ina counterclockwise direction, thereby pivotingthe leverearm 56 46 of -thetrigger-plate by the. outwardly =extendingendof the pivot-pin T2. of the. transmittingmember, the upper. armofthe leverhaving. an elongated vertical slot 929 therein to receivethe outer end of a pin 93 secured .to.the lower forward corner of .abolt-locking latch 94 which, in turn, ispivotally supported at...its.upper forward corner by the. sear. pivot-pin .132. on .the right-hand side of the trigger-plate. [.Thus,.a toggle-joint connection. is made between the safety-lever 92. and .the bolt-locking .latch 9 1 such. that when the safety-lever 92 is .moved into safety .on..position, as. hereinafter described, the bolt-locking latch will be automatically swung up into a position to lock the bolt-operating handle from rotation in a direction toeunlock the bolt, as indicated by, thebr'oken linesin Fig. 5; and on swingingthesafety-lever to its .ofi position, the bolt-lockingglatch will'be .moved into its inoperative position, as shown -by the full lines in Fig. 5. The upper. arm of .the. safetylever has .a finger-engaging. portion; fifirwhich extendsupwa-rdlyinto a clearance-recess 37in. the receiver and from thence outwardly substantially perpendicularly thereto to facilitateengagement byfthefinger of the operator, the finger-engaging portion fibeing resiliently.heldnormally. ins forwardor safety .off position by the. forceoi a safety-spring 93 acting topull .thepivot-pin sS of the toggle-jointedsafety-lever and bolt-lo"cking latch forwardlyin their respective inoperative positions.

It will be seen that by moving the fingereengaging portion .96 of the safety-leverfforwardly and rearwardly respectively, the lower forwardlyaxtending arm.99 thereof will be movedintoand from engagement with a pin I06 which extends transversely from the lower end of the sear-latch, as indicated. clearly in Fig; 8, *the'free" end "of the forwardlyextending arm 99 being provided with a. hook I [H for engaging in front of the transverse pin I00 of the sear-latch, to effectively'hold the latter fromswinging forwardly; or-in'a counter- :lockwise direction, to release the sear.

In this connection, it -wi1l be noted" that'in ;winging the hook it)! of the s'afety-levernpvardly' into engagement with the pin I00 ofthe war-latch, a cam-surface IE2- at the extremity )f the hook engages and cams thepin rearwar'diy is the end of the hook passesthereover -so'that ;he toe 69 of thesear-latch is moved rearwardly ilightly out of engagement with the shoulder 'i(iv nto maximum contact with. the .-cocking.-:-shoulder The, parts. areheld .in

bi the ..firing.-spring actingthrough thesearlto pivot the. sear-latch. in. aeountcrclo'ckwise. direction andhence hold. thesear-latch pin H10 in the ..hook lfll of..fthe.safety-lev.er, this'force being is' held in cocked position by the sear, to. engage sufiicient. to. overcome the force 'of"the; relativelyeweaksafetyrspring 98 whichis 'tensioned when .the safety-lever is swun 11p into searlatcheenga'ging position.

I A .modific'a'tionof the fire-control mechanism of 'thisiinven'tion. is shown in Eigrlfl, wherein. the ,general arrangement .of the... sear, sear-latch,

transmittingrlever and .trigger and associated :mechanism. is substantiallyjidentical .toi'that .of the..fire..-.control. mechanismZdescribed above. In

.. its .modified. form, however, ..the. locking .and

...upper portion eitheback edge of. ,thesear-leg I05. being blended into. the. bottom edge ofthe sear .by van arcuate relief-recess |01..ormd therein. The sear-latch l94..is..pivotally mounted at. its. upper endin the vertical passageof the trigger plate. by. means of atransverse pivot-pin i 98 .whichis located rearwardly of .1 the; leg-portion we. of the. sear and substantially.opposite the. relief-recess lfl'l'...in the.xbottom edgethereof. The lower end of the sear-datch .is ..normally .urgedto: swing. upwardly ina counterclockwise direction. by means..of.a. spring lll9 ..en agd on thepivot-pin I08 of,the.sear.-,latch.and having -.a forwardly-extendingarm llil engaging. against the rear edge. thereof ;..and a rearwardly-extend- ..and is .adapted to be. lockingly. engaged by .the

nib 'Iil6..of.ithe depending leg-portion IE5 oii'the sear, for'the purposehereinafter. described. The bottom edge H4 of the sear-latchisarcuate. and intersects the back edge ofthe searj-lat'chrtoform .:.a.relatively sharptoe. H5. The latter. is adapted normal y, that isto say, when the firing-plunger against 'the.forwardly-facing' shoulder H 6 of a notch I'll formed in the upper edge of the transmittingemember H8- adjacent the forward end "thereof. ""The' latter ispivotally' mounted'at'lts rear end inLthe. vertical passage of'thextriggerplate'and is adapted to beheldupre'siliently with its .forward' "end in engagement with a hutterwasher H9 bymeans'pf 1a coil-spring I20 adjustably supported in the bottomof the triggerplate' and adapted'toengage against the-undersideof the transmitting-member I I 8 forwardly of its'pivot-pin. -As in'the previously-described fire-control mechanism; "the rear end or the transmitting member provided with an"- up- Wardly- -'-and forwardly extending knees-portion'i2l adapted to be engaged byan upwardlyand' -forwardly extending finger-portion I22 of=a trigger l23-pivota1lymounted in 'the trigger-plate *rearwar'dly of the pivotal supporting-means" of the transmitting-member.

With":the elements of -.the"'fire-control' mecha- 1 inircockedl position. byiengagement. .oi its-cocking- 9 shoulder I25 withthe rearwardly-facing shoulder I26 of the sear I03 which is held up in its cocking position by engagement of the sear-nib .I06 with the shoulder H3 in the front edge of wardly in a clockwise direction, thereby depressing the forward end of the transmitting-memher, and in particular its shoulder II6, out of engagement with the toe II of the sear-latch to release the latter, whereupon the sear-latch shoulder H3 is pivoted downwardly in a clockwise direction by the force moment of the compressed firing-plunger spring acting against the shoulder of the sear and transmitted thereby to the sear-latch below the pivot-pin thereof. Consequently, the unlatched sear I03 is pivoted downwardly in a clockwise direction to disengage its shoulder I26 from the cocking-shoulder I25 of the firing-plunger to release the latter and effect the discharge of the firearm. On disengaging the trigger I23, the transmitting-member H8 is urged to pivot upwardly in a counterclockwise direction by the force of its compressed spring I I20, thereby pivoting the trigger I23 forwardly and elevating the forward end of the transmitting-member into engagement with the arcuate bottom edge II4 of the sear-latch I04. Since the toe I I5 of the latter has been displaced rearwardly of the shoulder II6 of the transmittingmember and is held in its rearwardly-displaced position by the sear-leg I05, the sear being held in its depressed position by the overriding of the breech-bolt and firing-plunger, the toe II5 of the sear-latch is prevented from re-engaging the shoulder N6 of the transmitting-member.

sear-spring I21, the sear-latch being pivoted-h forward freely in a counterclockwise direction by the force of its compressed spring I09 to reengage its toe I I5 in the notch II! of the transmitting-member. Then, with the movement of the breech-bolt into breech-closing position, the

cocking-shoulder I25 of the firing-plunger I24 re-engages the shoulder I26 of the sear to exert a force moment thereon tending to pivot the sear I03 in a clockwise direction, whereupon the toe N5 of the sear-latch is moved rearwardly slightly into locking engagement with the shoulder II6 of the notch III, the fire-control elements being thus effectively locked in firingplunger-cocking position.

As pointed out above, the elements of the modified fire-control mechanism are assembled generally in the relationship of the fire-control mechanism previously described, and hence the manually-operated safety-lever referred to above is adapted to be applied to the modified structure shown in Fig. 10, a transverse pin I28 being provided in the lower end of the gear-latch I04 for engagement by the forwardly-extending arm of the safety-lever, the hook of which (not shown) being modified to cammingly engage the back 1.0 edge of the pin I28, so as to positively hold the toe II5 of the sear-latch forwardly out of engagement with the shoulder H6.

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

I claim:

1. Trigger mechanism for bolt-action firearms, including in combination: a spring-pressed firing-member having a substantially-vertical forwardly-facing cocking-shoulder; a sear; searpivotal means located below and normally rearwardly of the said cocking-shoulder of said firingplunger; a rearwardly-facing substantiallyvertical sear-shoulder forwardly of said pivotal means; a trigger; lever mechanisminterposed between said trigger and sear and movable independently thereof normally to hold the said rearwardly-facing sear-shoulder in cooperative engagement with the forwardly-facing cockingshoulder of said firing-plunger against the force of its compressed spring and to release said searshoulder from engagement with the cookingshoulder of said firing-plunger when said trigger is operated to discharge said firearm; and a searfinger projecting rearwardly of the pivotal-means of said sear and arranged in juxtaposition to said trigger whereby displacement of said trigger in an abnormal direction of movement lowers the forward end of said sear to facilitate disassembly of the bolt from said firearm.

2. Trigger-mechanism for bolt-action firearms including in combination: a spring-pressed fir- I ing-plunger having a forwardly-facing cockingshoulder; a sear; a sear pivotal means; a rearwardly-facing shoulder on said sear forwardly of said sear pivotal means, said rearwardly-facing shoulder being adapted normally to cooperatively engage the cocking-shoulder of said firingplunger; a trigger; and coacting lever-means adapted to releasably hold said sear-shoulder in its normal position in Cooking engagement with the cocking-shoulder of said firing-plunger against the force of the compressed firingplunger spring, said coacting lever-means comprising a sear-supporting latch and a pivoted transmitting-lever interposed between said trigger and said latch, said latch being pivoted independently of said sear and being interposed between the latter and said transmitting lever and having a shoulder upon which said sear rests while engaged by the cocking-shoulder of said firing plunger, said shoulder forming a releasable engagement between said latch and sear, said latch being actuata ble toward sear-releasing position solely by the compressive force of said firing-plunger spring acting through said sear and being normally releasably held against such movement by engagement with said transmit ting-lever, said transmitting-lever being arranged to release said latch upon actuation of said trigger to permit said latch to be swung out of sear-supporting position by the force of said compressed firing-plunger spring, thereby releasing said sear from cocking engagement with said firing-plunger.

3. Trigger-mechanism for bolt-action firearms including in combination: a spring-pressed fir ing-plunger having a forwardly-facing cockingof the compressed firing-plunger spring, said eoacting lever-means comprising a sear-support1ng latch and a pivoted transmitting-lever interposed between said trigger and said latch, said latch being pivoted independently of said sear and being interposed between the latter and said transmitting lever andhaving a shoulder upon which said sear rests while engaged by the cocking-shoulder of said firing plungensaid shoulder 'forming a releasable engagement between said latch and sear, said Iatchbeing actuatabletoward sear-releasingposition solely by the compressive force of said firing-plunger springacting through said scar and being normally releasably held against such movement by engagement with said transmitting-lever, said transmitting-lever being pivoted at a point remote from the point of engagement with-said latch and being contacted by said trigger, upon actuation of the latter, adjacent the pivotpoint of said lever to efiect trigger movement multiplying action, said transmitting-lever being thus arranged to release said latch upon actuation ofsaid trigger to permit said latch to-beswung out of sear supporting position by theforce of the compressed. firing-plunger-spring, thereby releasing M said gear from cocking engagement: with said firing-plunger.

4. Trigger mechanism'for boltraction firearms as defined in claim 3, wherein-said searsupporting latch is free-swung on its pivot, said latch having a second shoulder adapted to be contacted by said sear uponamovement'of the latter toward its firing-plunger engagingposi-tion to swing said latch back. into. its normal position of releasable engagement with said transmittinglever. V

5. Trigger-mechanism for-bolt-action firearms includin in combin ti n: aspi in -pressed rin -p r havin -a forwardly-face gro oknsh u soar; sear pivot l-m ans; arearwardly-f cin hou deron' aidrs ari forwardly: of sa s r, p vo al me ns; sai rearw rdlysiaoin h ul er ein ad pte norma ly'to co perative y en he o kin -shoulder of V ai :flfi i plung a trigger ns vorrm an r ada ted to releasably hold said sear-shoulderim-its norm -posit o tin n n a emen with-th cocking-shoulder of said firing-plunger against the-force of the compressed firing-plunger spring, said coacting lever-means including atriggeractuated transmitting-lever anda pivoted sear supporting latch,.said searssupporting latch being arrangedto'be engaged by saidrtransmittinglever and held thereby in a positionto support said sear in cocking engagement with said springpressedfiring-plunger against the force of the compressed firing-plunger spring, said triggeractuated transmitting-lever being arranged to disengage said latch upon .actuatingsaid' trigger, they force of said compressed firing-plunger spring tin .ons i sear s rving torswin s id latch out of its sear-supporting positionpthereby resin sai ar fr m c olsin ns sement wi h id firin -plun er: andarsearprinsl said searprin b in in pendent. f s idlatohrand arranged to engage said sear below said searshoulder to return said sear to its normal posi- "HOD. ror re-engagement of said cocking-shoulder with said firing-plunger.

6. Trigger-mecnanlsln for bolt-action firearms inclu ing in combination: aspring-pressed firing-plunger having a Iorwardly-I'aclng cocking.- shoulder; a sear; sear pivotal means; a rear- :ardly-I'acing shoulder on said sear forwardly "of said sear pivotal means, said rearwardly-iacing shoulder being adapted normally to cooperatively engage. the cocking-shoulder of said :firingplunger; a trigger; coacting lever-means adapted to releasably hold said sear-shoulder in its, nor- '-mal position in cooking engagement with the cocking-shoulderof said firing-plunger a ainst the force of the compressed firing-plunger spring. saidcoacting lever-means including a trigge qactuated transmittingslever and-a pivoted searsupp rtin l ch, a d r nsmitting-l ver bein interpose betweenzsaid rigger and .saidila oh andarran ed to .multip ythe movemento said tr er or actuating said latch. and resilient means arranged to e g said ransmittin lever" normally to urgesaid transmitting-lever into engagement with said sear-supporting latch so as to hold the latter in a position to support said sear in cocking engagement with said spring-.

pressed firing-p1unger against the force of the compressed firing-plunger spring, said triggeractuated transmitting-lever being arranged to disengage said latch upon actuating said trigger, the force of said compressed firing-plunger spring acting on said sear serving to swing said latch out of itsrsear-supporting position thereby releasing said sear from cocking engagement with said firing-plunger; and a sear-spring, spring being independent of said latch and arranged to engage said sear below said searshoulder to return said soar to its normal position for re-engagement of said cocking-shoulder with said firing-plunger.

7. Trigger-mechanism for bolt-action firearms including in combination: a, receiver having a trigger-plate, fixedly mounted thereon; a springpressedfiring-plunger reciprocably mounted in said receiver and having a forwardly-facing cocking-shoulder; asear; pivotal means arranged to. mount said sear in said trigger-plate; a rearwardly-facing shoulder on said sear forwardly of said sear pivotal means, said rearwardly-facing Shoulder being adapted normally to cooperatively engage the cocking-shoulder of said firingplunger; a trigger pivotally mounted on said trig or -plate; coacting lever-means adapted to releasably hold said sear-shoulder in its normal p ition in. cookin n a em nt with the co k: in rsh uld r of i fi in -plun er against the for of i th compre sed. firin -plun r spr ng. s i ,o actins' l ver-m ns compri i a e supporting latch pivotally mounted in said trigger-plate, a transmittingdever pivotally mounted o said trigger-plate between said trigger and said lateh and arranged to multiply the movement of said trigger for actuating said latch; resilient means arranged to engage said transmitting-lever normally to urge said transmittinglever into engagement with said sear-supporting latch so as to hold the latter in a position to support said soar in cocking engagement with spring-pressed firing-plunger against the foroeof the compressed.firin eplun er sprin said trigger-actuated transmitting-lever being arranged to disenga esaid latch upon actuating said trigger, the force of said compressed firingplunger spring acting on said sear serving to swing said latch out of its sear-supporting posi said sear-- 13 tion thereby releasing said sear from cocking engagement with said firing-plunger; and a searspring, said sear-spring being independent of said latch and arranged to engage said sear below said sear-shou1der to return said sear to its normal position for re-engagement of said cockingsheulder with said firing-plunger.

HARRY H. SEFRIED, II.

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

Number Number 14 UNITED STATES PATENTS Name Date Loomis Aug. 2, 1938 Wright et a1. Aug. 9, 1938 Smith July 15, 1941 Garrison Feb. 24, 1942 FOREIGN PATENTS Country Date Germany Oct. 15, 1938

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2775836 *Feb 5, 1954Jan 1, 1957Emerson Roy JSpeed trigger
US2775837 *Oct 16, 1952Jan 1, 1957Birmingham Small Arms Co LtdFiring mechanism for a firearm
US2813362 *Jun 27, 1955Nov 19, 1957Sunderland Oswald OSear-controlling mechanism for firearms
US2855716 *Apr 5, 1955Oct 14, 1958Remington Arms Co IncFire control mechanism
US2856717 *Apr 1, 1957Oct 21, 1958Parke William RRifle trigger and safety mechanism
US3370374 *Jan 24, 1966Feb 27, 1968Husqvarna Vapenfabriks AbFiring mechanism with means for adjusting trigger-sear overlap
US5487233 *Feb 13, 1995Jan 30, 1996Arnold W. JewellTrigger mechanism for firearms
US5666754 *Jul 7, 1995Sep 16, 1997Forjas Taurus S/ALocking system for integrated hammer of semi-automatic pistol
US6263606 *Jun 30, 1999Jul 24, 2001Steyr Mannlicher Ag & Co KgPistol having a prestressed firing bolt
US8220193Sep 22, 2010Jul 17, 2012O.F. Mossberg & Sons, Inc.Method and apparatus for adjustable trigger assemblies for firearms
US8250799Jul 27, 2009Aug 28, 2012O.F. Mossberg & Sons, Inc.Method and apparatus for trigger assemblies for firearms
Classifications
U.S. Classification42/69.2
International ClassificationF41A19/00, F41A19/31
Cooperative ClassificationF41A19/31
European ClassificationF41A19/31