US2464418A - Fire control mechanism for automatic and semiautomatic firearms - Google Patents

Fire control mechanism for automatic and semiautomatic firearms Download PDF

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US2464418A
US2464418A US54A US5448A US2464418A US 2464418 A US2464418 A US 2464418A US 54 A US54 A US 54A US 5448 A US5448 A US 5448A US 2464418 A US2464418 A US 2464418A
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abutment
sear
cocking
secondary
trigger
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Harry H Sefried
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OLIN IND Inc
OLIN INDUSTRIES Inc
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OLIN IND Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/46Arrangements for the selection of automatic or semi-automatic fire

Description

March 15, 1949.

H. H. SEFRIED, 1]: FIRE CONTROL MECHANISM FOR AUT OMATIC AND SEMIAUTOMATIG FIREARMS 4 Sheets-Sheet l Filed Jan. 2, 1948 &

Mar 1 1949- H. H. SEFRIED, ]I

FIRE CONTROL MECHANISM FOR AUTOMATIC AND SEMIAUTOMATIC FIREARMS 4 Sheets-Sheet 2 Filed Jan. 2, 1948 De 4 Q ll l I March 15, 1949. H. H. sEFRlED, 11 2,464,418

FIRE CONTROL MECHANISM FOR AUTOMATIC AND SEMIAUTOMATIC FIREARMS 4 Sheets-Sheet 4 Filed Jan. 2, 1948 lnuentor rtor'negs Patented Mar. 15, 1949 FIRE CONTROL MECHANISM FOR AUTO- MATIC AND SEMIAUTOMATIC FIRE- ARMS Harry H. Sefried, II, NewHaven, Conn., assignor to Olin Industries, Inc., New Haven, Conn, a

corporation of Delaware Application January 2, 1948, Serial No. 54

12 Claims.

1 The present invention relates to improvements in self-loading firearms and relates more particularly to self-loading firearms of the type which may be manually set to operate either as a full automatic firearm or a semiautomatic firearm. In other words, the firearm of the present invention may be selectively set to automatically reload and repeatedly discharge as long as the trigger is held in a retired or pulled position, or to automatically load but require the operation. of the trigger for each shot.

One of the objects of the present invention is to provide a superior fire-control mechanism whereby a firearm will function selectively either automatically or semiautomatically at the option of the user, and which possesses a high degree of reliability despite long use under adverse conditions.

Another object of the present invention is to provide a superior automatic and semiautomatic firearm having a superior fire-control mechanism of such character as will not only permit the selection of automatic or semiautomatic fire, but which will, in both instances, insure that the firing cannot be accomplished until such time as the breech-bolt is fully closed and adequately locked.

A further object of the present invention is to provide a superior fire-control mechanism which may be incorporated in a firearm of the wellknown Garand military type without requiring the extensive re-design thereof.

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.

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

Fig. 1a is a broken view of the central portion of an automatic and semiautomatic firearm embodying the present invention, shown mainly in side elevation with the stock partly broken away and in vertical section, the breech-bolt being shown in its fully closed position with the selector-member and associated parts positioned in readiness to cause the firearm to operate semiautomatically;

Fig. lb is a broken View of the portion of the firearm immediately forwardly of the parts shown in Fig. 1a, with the stock shown partly in section and with the tubular front portion of the bolt-operating slide also in section;

Fig. 2 is a view similar to Fig. 1a, except that the parts are shown in the positions which they assume at the instant of firing;

Fig. 3 is a view similar to Figs. 1a and 2, but showing the selector-member shifted to enable the firearm to function as a full automatic firearm and with the trigger being shown in its pulled position and the hammer being shown as held in a cooked position by the tertiary sear, and the breech-bolt and associated parts being shown in the positions which they assume during the forward movement of the breech-bolt and just prior to the latter reaching its breech-closing position;

Fig. 4 is a view similar to Fig. 3, but with the breech-bolt shown in its breech-closing position and locked therein and with the tertiary sear-bar in the position it assumes substantially at the instant of releasing the hammer;

Fig. 5 is a broken transverse sectional view taken on the line 5-5 of Fig. 1a;

Fig. 6 is a transverse sectional view taken on the line 6-6 of Fig. 3, but leaving the receiver in elevation;

Fig. 7 is a broken sectional view taken on the line 1-1 of Fig. 3, but leaving the receiver in elevation;

Fig. 8 is a perspective view of the hammer detached;

Fig. 9 is a perspective view of the unit comprising the combined trigger and primary seararm and the secondary sear;

Fig. 10 is a perspective view of the tertiary sear detached;

Fig. 11 is a perspective View of the unit comprising selector-lever, sear-holding member and pivot-pin shown as assembled; and

Fig. 12 is a broken perspective view looking mainly toward the inner face of the rear portion of the bolt-operating slide.

The main features of the firearm illustrated in the accompanying drawings are of the well known "Garand type and comprising a receiver generally designated by the reference character III, a barrel H, a trigger-plate generally designated by the reference character l2 and a stock l3. The barrel I I projects rigidly forwardly from the forward end of the receiver I0, while the trigger-plate unit I2 is located generally below the receiver 10 in a manner usual in military firearms. The parts l0, II and I2 are suitably secured to the stock l3.

At its lower-rear portion, the trigger-plate unit 12 is formed with a loop-like trigger-guard l4 accommodating and shielding the finger-piece 15 of a trigger generally designated by the refer- (mac character 'I 3. The said trigger I3 is mounted for pivotal movement upon a trigger-pin H extending transversely of the firearm structure and supported at its respective opposite ends in the two spacedapart side-plates I3 and I3 forming integral features of the trigger-plate unit II. as may be seen by reference to Figs. 6 and 7 in particular.

The trigger it projects upwardly substantially above the trigger-pin I1 to provide a primary sear-arm 23. The said sear-arm 23 is provided at its upper-forward portion with a transverse cocking-lug 2| having an underface shaped to provide what may be aptly termed a primary cocking-abutment 22. The said primary cockingabutment 22 is adapted to be releasably engaged (Fig. 1a) with a complemental primary cockingabutment 23 formed at the forward-lower corner of a bifurcated cocking-arm 24 constituting an integral extension of a firing-member in the form of a pivotal-hammer 25. The cocking-arm 24, Just referred to, is bifurcated as just described to provide clearance for the upper portion of the primary sear-arm 23 when the hammer is in its cocked position.

The hammer 25 above referred to is mounted for swinging movement about a transverselyextending hammer-pin 26 supported in the trigger-plate unit I2 and is urged to swing in a clockwise direction by a helical hammer-spring 21. The said hammer-spring partly envelops and thrusts forwardly upon a plunger 23 which latter has its forward end engaged with the said hammer. The hammer-spring 21 is mainly housed within and thrusts rearwardly upon a springhousing 29 having its rear end loosely supported upon the trigger-pin I1.

The hammer 25 when released to the action of the hammer-spring 21 is adapted to strike therear end of a firing-plunger 33 and drive the same forwardly to discharge a cartridge in a manner well known in the art. The said firingplunger extends centrally through a breech-bolt 3I, which latter will be more fully hereinafter described.

In addition to its primary cocking-abutment 23, the cocking-arm 24 of the hammer 25 is formed at its lower-rear portion with a secondary cocking-abutment 32 which slopes upwardly and forwardly (when the hammer 25 is cocked) and which extends transversely also along the lower-rear corner of a cocking-lug 33 offsetting laterally toward the right side of the firearm from the lower-rear portion of the cocking-arm 24, as is especially well shown in Fig. 8. The upper surface of the cocking-lug 23 Just referred to provides a third or tertiary cocking-abutment 34 for purposes as will hereinafter appear.

As thus constructed, the hammer 25 or equivalent flring-member is provided with three cocking-abutments, i. e., the primary cocking-abutment 23, the secondary cocking-abutment 32 and and the tertiary cocking-abutment 34.

The secondary cocking-abutment 32 of the hammer 25 is adapted to be releasably engaged by a secondary cocking-abutment 35 forming a feature of a secondary sear generally designated by the reference character 33. The forward-portion of the said secondary sear is bifurcated so as to fit over the primary sear-arm 23 of the trigger I6, as is indicated in Fig. 9. The bifurcated forward portion of the secondary sear 33 erably rounded as is shown, to provide a thrustnose 33 extending forwardly of the front face of the scar-arm 23 into position to be engaged by a thrust-surface 33 at the rear of the spring-housing 23. The thrust-nose 33 is located in such position with respect to the sear-pin 31 as to cause the rearward thrust of the spring-housing 23 to exert a yielding effort to turn the secondary sear in a clockwise direction with respect to the sear-arm 23 by which it is carried. Thus, the hammer-spring 21 not only urges the said secondary sear to turn about the sear-pin 31 in a clockwise direction but it simultaneously urges the entire trigger I3 to turn in a counterclockwise direction in opposition to the pull" applied to the finger-piece I3.

At its rear, the secondary sear 33 is formed with an upwardly-and-rearwardly-curving sear holding finger 43 which is adapted to have its forward face engaged by the rear face of a sear-holding finger 4| forwardly-and-downwardly-curving from the upper portion of a sear-holding member 42.

On its right side, the sear-holding member 42 is formed with an upwardly-facing ledge 43 against which is seated thelower end of a selector-lever 44 which may be conveniently formed of sheet metal and which is formed at its upper end with a finger-piece 45 extending into a position for manipulation from the exterior of the firearm structure. Extending transversely through the lower portion of the selector-lever 44 and the sear-holding member 42 is a pivotpin 43 supported (Fig. '1) at its respective opposite ends in the side plates I3 and I9 of the triggerplate unit I2. The pivot-pin 43 in addition to providing for the pivotal movement of the unit comprising the sear-holding member 42 and the selector-lever 44, also serves to hold the lower end of the said selector -lever seated against the ledge 43 on the member 42 to thus rigidly couple the said parts together for concurrent swinging movement.

Inits lower portion, the sear-holding member 42 is provided with a transverse bore 41 in which is mounted on a helical detent-spring 43 and the respective inner portions of two similar detentplungers 43-43, as is shown in Fig. 7. The said detent-plungers are urged outwardly in opposite directions respectively by the detent-spring 43 and into suitable detent-pockets 53 and 5| according to the particular position into which the sear-holding member 42 is swung. The said detentplungers 4343.thus serve to yieldingly hold the unit comprising the sear-holding member 42 and the selector-lever 44 in either of two 1 positions for purposes as will hereinafter appear.

is pivotally mounted upon the sear-arm '23 by At its lower end the sear-holding member 42 is provided with a downwardly-extending guarding 52 which is adapted to coact, in the manner as will hereinafter appear, with an upwardly-extending guard-lug 53 formed upon the trigger I3.

Coacting with the, tertiary cocking-abutment 34 of the hammer 25 is a downwardly-facing tertiary cocking-abutment 54 formed at the rear of a sear-arm 55 constituting a feature of a tertiary sear, generally designated by the reference character 53.

The tertiary sear 53 may be conveniently formed of heavy-gauge sheet metal and is generally of bar-like form adapted for reciprocation lengthwise of the receiver. I3 adjacent the right side thereof. The downwardly-extending seararm 55 is integrally connected to the main portion of the tertiary sear by a reach 51 extending trans versely of the firearm structure so as tolocate the sear-arm 55 in position to enable the tertiary cocking-abutment 54 to engage with the tertiary cocking-abutment 34 of the hammer 25.

Adjacent its forward end, the tertiary sear 56 is provided with a rearwardly-facing trippingabutment 5B and with an inwardly-extending guide-pin 59, which latter rides in a slot 60 formed in the depending side-wall portion SI of the receiver). The said depending side-wall portion is located forwardly of the trigger-plate unit, hammer and associated features and provides for the accommodation and support of a suitable box-magazine indicated at 62..

The tertiary sear 56 has its forward end supported for limited reciprocation lengthwise of the firearm structure by means of the guide-pin 59 and the slot 60. The rear portion of the said sear 56 is supported against downward displacement y having the lower edge of its sear-arm 55 slidably engaging with the upper surface of the righthand side-plate [9 of the trigger-plate unit l2.

For the purpose of yieldingly urging the tertiary sear 56 rearwardly into position to engage its tertiary cocking-abutment 54 with the tertiary cocking-abutment 34 of the hammer 25, a helical searspring 63 is employed. The said sear-spring encircles a headed plunger 64 slidable in aguideopening 65 formed in the reach 51 of the sear 5B. The sear-spring 63 has its rear end seated against the front face of the reach 51 and has its forward end seated against the head of the plunger 64 so as to force the forward end of the said plunger in a suitable'recess formed in the rear edge of the side-wall portion 6! of the receiver Id.

The tripping-abutment 58 of the tertiary sear 56 is adapted to be engaged by a rearwardlyfacing tripping-abutment 66 located adjacent the rear end and constituting a feature of a boltoperating slide or member 8! mounted for reciprocation lengthwise of the firearm structure on the right side thereof. The said bolt-operating slide corresponds, in the main, to the member in the well-known Garand rifle and is commonly referred to in the nomenclature thereof as the transmitting-bar.

The breech-bolt 3! before referred to corresponds generally to the breech-bolt of the wellknown Garand rifle and is provided on its right side with a locking-lug 68 adapted to oscillate into and out of engagement with a forwardly-facing locking-abutment 65 forming the rear wall of a clearance-notch 10 formed in the adjacent side wall of the receiver it in a manner well understood in the art.

Extending outwardly from the forward portion of the locking-lug 68 of the breech-bolt 3! is an integral actuating-lug ll extending into a camrecess 72 in the inner face of the rear portion of the bolt-operating slide 31.

The bolt-operating slide 61 is formed at its rear end with a laterally-projecting finger-piece 33 by means of which the firearm may be manually operated.

In a manner well understood in the art, the cam-recess 12 in the bolt-operating slide 61 and the actuating-lug ll of the breech-bolt 3| are shaped to cooperate in such manner that when the said bolt-operating slide is moved rearwardly from its normal forward position, the breech-bolt 3| will be first turned so as to disengage the locking-lug 68 thereof from the locking-abutment 69 of the receiver l0, whereupon the said breechbolt will be moved directly rearwardly. The rearward movement of the breech-bolt, in a manner usual in firearms, wlllefiect the extraction and ejection of the just-fired cartridge and the cocking of the hammer 25, which latter the said breech-bolt overrides.

Upon its forward stroke, the bolt-operated slide 61 will first draw the breech-bolt 3| forwardly until the rear face of the locking-lug 68 of the said breech-bolt is in registration with the locking-abutment 69, whereupon the said breech-bolt will be turned to again lock the breech-bolt in its forward or breech-closing positionall in the manner common in firearms. Force may be applied to eflect the rearward movement of the bolt-operating slide 61 and, hence, also of the breech-bolt 3!, in any suitable manner. In the instance shown, the actuatingmeans for the said bolt-operating slide is the same as that employed in the Garand rifle and includes a tubular piston It rigid with the forward end of the said slide and located beneath the barrel H. The said tubular piston it houses a helical breech-closing spring it which, in the i. usual manner, exerts a constant-but-yielding effort to hold the bolt-operating slide 51 in its foremost position and, hence, serves to hold the breech-bolt 3| in its forward breech-closed and locked position. Y

The upper edge of the tertiary sear 56 rides in a downwardly-opening groove '76 formed in the right side Wall M of the receiver l0.

semiautomatic operation Let it be assumed for purposes of description that it is desired to have the firearm above described function as a semiautomatic firearm, i. e., automatically extract and eject just-fired 'cartridges and reload but requiring the individual pulling of the trigger for each desired shot.

Under the circumstances above referred to, the selector-lever will be moved into the position in which it is shown in Figs. la and 2, together with the seam-holding member 32- coupled thereto.

With the selector-lever set as above described, it may be assumed for purposes of description and as is shown in Fig. 1a that the hammer 25 is cooked and the trigger I6 is released from rearward finger pressure.

In Fig. 1a, the hammer 25 is held in its cocked position by the primary cocking-abutment 22 of the primary sear-arm 20 of the trigger it, while both the secondary sear 3B and the tertiary sear 56 are in their retired po- .sitions.

Now when the trigger is pulled into the position in which it is indicated in Fig. 2, the primary cocking-abutment 22 will be retired and the hammer 25 will be released to the action of the hammer-spring 2'! and will swing upwardly into the position in which it is shown in Fig. 2, to thereby strike the firing-plunger 30 and thus effect the discharge of the firearm.

Substantially instantaneously with the above action, energy from the just-fired cartridge will kick the bolt-operating slide 6'! rearwardly in a manner well known in the art and as exemplified, for instance, in the well-known Garand military firearm.

The rearward movement of the bolt-operating slide 61 as just above referred to, will by virtue of the coaction between its cam-recess l2 and the actuating-lug I of the breech-bolt 3|, first cause the said breech-bolt to be oscillated laterally to unlock the same, as previously described, and to subsequently move the said shown as being 7 breech-bolt rearwardly to eifect the extraction and ejection of the Just-fired cartridge in a manner common in automatic and semiautomatic firearms.

As the breech-bolt II is moved rearwardly as above described, the hammer 25 will be swung in a counterclockwise direction by the overriding action of the rear portion of the breech-bolt 3 l and should the trigger l5 still be held pulled during such movement (which is normal), the said hammer will be caught and temporarily held in a cooked position by the engagement of its secondary cocking-abutment 32 with the secondary cocking-abutment 35 of the secondary sear 33, which latter will at this time be'in its advanced position, as is shown in Fig. 2. As soon, however, as the trigger is released, the hammer will be released by the said secondary scar and will be caught by the primary cocking-abutment 22 of the trigger so that the parts just referred to will again assume the positions in which they are shown in Fig. la.

After completing its rearward travel, the

' breech-bolt 3| will be drawn forwardly by the return movement of the bolt-operating slide 51 which latter will act under the urge of the breech-closing spring (Fig. 1b)

During its forward travel, the breech-bolt 3| will pick up a fresh cartridge in the manner usual in self-loading firearms and will insert such fresh cartridge into the cartridge-chamber of the firearm. When in the forward travel of the breech-bolt 3|, its locking-lug 68 is brought into registry with the locking-abutment 69 of the receiver Hi, the breech-bolt will be turned laterally and restored to the fully-locked position indicated in Figs. la and ,2.

The final forward movement of the bolt-operating slide 51 (following the closing and locking of the breech-bolt) will engage its tripping-abutment 65 with the tripping-abutment 58 and then shift the tertiary sear 56 forwardly against the tension of the sear-spring 53. This action will shift the tertiary cocking-abutment 54 of the said tertiary sear forwardly out of the path of movement of the tertiary cocking-abutment 34 of the hammer 25.

The mechanism will now be in the position indicated in Fig. 1a, preparatory to another discharge of the firearm and the subsequent automatic reloading thereof as soon as the fingerpiece 15 of the trigger I6 is pulled rearwardly.

It will be noted by reference to Figs. la and 2 I that when the selector-lever 44 and its .unitary sear-holding member 42 are in the positions in which they are shown in the said figures, the guard-lug 52 of the member 42 is located forwardly and in a clearance position with respect to the complemental guard-lug 53 of the trigger I 6. Hence, as the trigger is pulled, the guardlug 53 will ride upwardly to the rear of the guarding 52 without interference. The construction and arrangement, however, is such that the coaction of the guard-lugs 52 and 53 will prevent the selector-lever 44 from being shifted until such time as the trigger is released.

Fully-automatic operation Let it now be assumed that it is desired to have the firearm function as a fully-automatic weapon, 1. e., effect the continuous discharge of cartridges as long as the trigger is held in its pulled position.

To accomplish the purpose above referred to,

. 3 the selector-lever 44 and its unitary sear-holding member 42 may be manually shifted from the positions in which they are shown in Figs. 1 and 2 into the positions in which they are shown in Figs. 3 and 4.

The movement of the sear-holding member 42 above described will cause its downwardly-extending sear-holding finger 4i to hook itself in front of the complemental sear-holding finger 43 of the secondary sear 38, to thus restrain the secondary cocking-abutment 35 of the latter from swinging forwardly into anactive position when the primary sear-arm 20 of the trigger II is moved forwardly by rearward draft upon the finger-piece l5, all in a manner as will hereinafter appear.

In Fig. 3, the trigger I6 is shown as pulled and the breech-bolt is shown as approaching its breech-closing position following a previous discharge of the firearm. With the trigger pulled as just above described, it will be noted by reference to Fig. 3 that the coaction of the two searholding fingers 40 and 4| serves to maintain the secondary cocking-abutment 35 of the secondary sear 36 out of the path of movement of the secondary cocking-abutment 32 of the hammer 25, so that, in effect the said secondary sear is rendered inoperative.

Since at this time the trigger I6 is pulled, its primary cocking-abutment 22 will also be retired out of the path of movement of the primary cocking-abutment 23 of the hammer 25. Thus, under the present conditions, both the primary cockingabutment 22 and the secondary cocking-abutment 35 are retired, thus leaving the cocking of the hammer 25 or its equivalent entirely dependent upon the engagement of the tertiary cockingabutment 54 of the tertiary sear 55 with the tertiary cocking-abutment 34 of the hammer, as is indicated in Fig. 3.

After the forward'movement of the bolt-operating slide 61 (under the urge of the breech-closing spring 15) has effected the locking of the breech-bolt 3| in its breech-closing position, the continued forward movement of the said boltoperating slide will engage its tripping-abutment 58 with the tripping-abutment 58 of the tertiary sear 55. The action last referred to will cause the tertiary sear to be moved forwardly against the counter-urge of its sear-spring 63, to thereby remove the tertiary cocking-abutment 54 of the said sear out of the path of movement of the tertiary cocking-abutment 34 of the hammer 25, to thus release the hammer and permit the discharge of the firearm. In Fig. 4,'the tertiary sear 56 is shown as moved forwardly in the manner Just above described to an extent necessary to bring its tertiary cocking-abutment 56 substantially into the position which it would assume at the instant of the disengagement of the latter from the tertiary cocking-abutment 34 of the hammer.

As long as the trigger I6 is held pulled and as long as the ammunition lasts, the firearm will' 3| has been fully closed and locked, whereupon Rsum From the foregoing description and by reference to the accompanying drawings, it will be seen that the construction and arrangement of parts is such that the selector-lever 44 or its equivalent is effectively prevented from being shifted as long as the trigger I6 is held pulled.

It will be further apparent that when the firearm is set to function as a semiautomatic firearm, both the secondary cocking-abutment 35 and the primary cocking-abutment 22 are brought into play to sequentially releasably hold the hammer in its cocked position. Meanwhile, however, and in each instance, the tertiary cocking-abutment 54 will be in a guard position to prevent the accidental discharge of the firearm until such time as the breech-bolt 3| is fully in its breechclosing position and locked therein.

It will also be apparent from the foregoing? and by reference to the accompanying drawings that when the selector-lever 44 is shifted to cause the firearm to function as a fully-automatic firearm, the secondary sear 36 is rendered inoperative and as long as the trigger i6 is held pulled (as would normally be the case to eflect full automatic fire) the entire task of holding the hammer 25 in its cocked position devolves upon the tertiary sear 56. It is to be understood, however, that at any time during the full automatic operation of the firearm it is desired to cease fire, the release of rearward draft upon the finger-piece KB of the trigger IE will restore the primary cocking-abutment 22 of the primary sear-arm into position Where it Wll releasably hold the hammer in a cocked position by engagement with the primary cocking-abutment 23 of the said hammer.

By the unique combination and arrangement of parts above described, a self loading firearm may be selectively caused to function either as a semiautomatic or fully-automatic firearm in a manner wh ch is simple, reliable and effective, despite rough handlin and long periods of use.

The inven ion may be carried out in other specific ways than those herein set forth without departing from the sp rit and essential characteristics of the invention. and the resent embodiments are. therefore, to be considered in all respects as illustrat ve 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. An automatic and semiautomatic firearm, including in comb nation: a receiver; a unit comprising a breech-bolt movable in the said receiver and a bolt-operating member mounted for movement adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear operatively associated with the said trigger for being moved thereby and having a primary cocking-abutment releasably engageable with the primary'cockingabutment of the said firing-member when the said trigger is released; a secondary sear having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-'member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a tertiary sear having a tertiary cocking-abutment releasably engageable with the tertiary cockingabutment of the said firing-member; manuallyoperable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to effect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment of the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firing-member and permitting the relative movement of the secondary sear in the opposite direction; and means actuated by the said unit to retire the said tertiary sear as the said breechbolt moves into its breech-closing position.

2. An automatic and semiautomatic firearm,

including in combination: a'receiver; a breechbolt movable in the said receiver; a bolt-operating member mounted for movement adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cockingabutment, a secondary cocking-abutment and a tiary cocking abutment releasably engageable sear operatively associated with the said trigger for being moved thereby and having a primary cocking-abutment releasably engageable with the primary cocking-abutment of the said firingmember when the said trigger is released; a secondary sear having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firingmember when the said trigger is pulled and movable with respect to the said trigger for being held in a retired pos tion; a tertiary sear having a tertiary cocking-abutment releasably engageable with the'tertiary cocking-abutment of the said firing-member; manually-operable controlmeans engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said tr gger to effect the movement of the former by the lat er the said means including a spring yielding y urging te secondary cocking-abutment of the sa d secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firingmember and permitting the relativemovement of the secondary sear in the 0pp0=ite d rection; and means arried by the said bolt-operating member to retire the said tertiary sear as the said breech-bolt moves into its breech-closing position.

3. An automatic and semiautomatic firearm, including in comb nation: a rece ver; a unit comprising a breech-bolt movable in the said receiver and a bolt-operating member mounted for movement adiacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear operatively associated with the' said trigger for being moved thereby and having a primary cocking-abutment 'and movable with position to retire the said I semiautomatic firearm,

ll releasably engageable with the primary cockingabutment of the said firing-member when the said trigger is released: a secondary sear having a secondary cocking-abutment normally releasably engageable with the secondary cockingabutment or the said said trigger is pulled and movable with respect to the said trigger for being held in a-retired position; a tertiary sear having a tripping-abutment and a tertiary cocking-abutment releasably engageable with the tertiary cocking-abutment of the said firing-member; manually-operable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the saidtrigger to eflect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment oi the said secondary ar into position iorreleasable engagement with the secondary cocking-abutment of the said firingmember and permitting the relative movement of the secondary sear in the opposite direction; and

firing-member when the ment; atriggenaprimarysearrigidwiththe said trigger for movement therewith and having ary cocking-abutment engageable with the primary cocking-abutment oi the I said firing-member when the said trigger is rev i'or releasably holding the same in including a a tripping-abutment carried by the said unit and engageable with the tripping-abutment oi the said tertiary sear as the said breech-bolt moves into its breech-clodng position to retire the said tertiary sear.

4. An automatic and including in combination; a receiver; a breechboit movable in the said receiver; a bolt-operating member mounted for movement adjacent the said receiver and operativelyconnected to the said breech-bolt for moving the same; a springpressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear operatively associated with the said trigger for being moved thereby and having a primary able with the primary cocking-abutment oi the said firing-member when the said trig er is released; a cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said tiring-member when the said trigger is pulled respect to the said trigger for being held'in a retired position; a tertiary sear having a tripping-abutment and a teritary cocking-abutment releasably engageable with the tertiary cocking-abutment of the said i'iringmember; manually-operable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to effect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment or the said secondary seal into position for releasable enga ement with the second-- of the said firing-member ary cocking-abutment and permitting the relative movement of the secondary sear in the opposite direction; and a semiautomatic firearm, I

cocking-abutment releasably engage-' retired position;

tripping-abutment carried by thesaid .bolt-.

operating member and engageable with the tripping-abutment oi the .said tertiary sear asthe said breech-bolt moves into its breech-closing tertiary sear.

8. An automatic and including in combination: a receiver; a unit comprising a breech-bolt movable in the said receiver and a bolt-operating member mounted. for move-v ment adjacent the said receiver and operatively connected to the said breech-bolt for moving the same: a spring-pressed firing-member provided leased; secondary sear yieldingly carried by the saidtrigger and havin a secondary cockingnormally releasably engageable with secondary cocking-abutment oi the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in-a retired position; a tertiary sear having a tertiary. cocking-abutment releasably engageable with the tertiary cocking-abutment or the said firing-member; manually-operable controlmeans engageabie with the said sear a retired position; means operatively connecting the said secondary sear to the said trigger to eilect the movement 0! the iormer by the latter, the said means ary cocking-abutment oi the said secondary sear into position for releasable engagement with the secondary cocking-abutment oi the said firingmember and permitting the relative movement of the secondary sear in the opposite direction; and means actuated by the said unit to retire the said tertiary sear as the said breech-bolt moves into its breech-closing position.

8. An automatic and semiautomatic firearm, including in combination: a receiver; a breechbolt movable in the said ing member mounted for movement adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring pressed firing-member provided with a prim ry cocking-abutment. a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear rigid with the said trigger for movement therewith and having a primary cocking-abutment primary cocking-abutment of member when the said trigger ondary sear yieldingl carried by the said triggerand having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment oi the said firing-member when the said trigger .is pulled and movable with respect to the said trigger for the said firingis released; a seca tertiary sear having a tertiary cocking-abutment releasably n ageable with the tertiary cocking-abutment of th said firing member; manually operable controlmeans engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to eflect the movement oi the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutmentot the said secondary sear into position for releasable-engagement with the secondary cocking-abutment oi the said firingmember and permitting vthe relative movement of the secondar sear in the opposite direction; and means carried by the said bolt-operating member to retire the said tertiary sear as the said breech-bolt moves into its breech-closing positiqn. H

7. An automatic and semiautomatic firearm, including in combination: a receiver; a unit comprising a breech-bolt movablein the said receiver and a bolt-operating member mounted for movement adjacent the said receiver and operspring yieldingly'urging the secondreceiver; a bolt-operatreleasably engageable with the.

beingheldina.

atively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear rigid with the said trigger for movement therewith and having a primary cocking-abutment releasably engageable with the primary cocking-abutment of the said firing-member when the said trigger is released; a secondar sear yieldingly carried by the said trigger and having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a tertiary sear having a tripping-abutment and a tertiary cocking-abutment releasably engageable with the tertiary cocking-abutment of the said firing-member; manually-operable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to efiect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cockingabutment of the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firing-member and permitting the relative movement of the secondary sear in the opposite direction; and a trippingabutment carried by the said unit and engageable with the tripping-abutment of the said tertiary sear as the said breech-bolt moves into its breech-closing position to retire the said tertiary sear.

8. An automatic and semiautomatic firearm, including in combination: a receiver; a breechbolt movable in the said receiver; a bolt-operating member mounted for movement adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a springpressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear rigid with the said trigger for movement therewith and having a primary cocking-abutment releasably engageable with the primary cocking-abutment of the said firing-member when the said trigger is released; a secondary sear yieldingly carried by the said trigger and having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a tertiary sear having a trippingabutment and a tertiary cocking-abutment re-' leasably engageable with the tertiary cockingabutment of the said firing-member; manuallyoperable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to efiect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment of the said secondary sear into position for releasable engagment with the secondary cocking-abutment of the said firing-member and permitting the relative movement of the secondary sear in the opposite direction; and a tripping-abutment carried by the said bolt-operating member and engageable with the tripping-abutment of the said tertiary sear as the said breech-bolt moves into its breech-closing position to retire the said tertiary sear. i

9.An automatic and semiautomatic firearm, including in combination: a receiver; a unit comprising a breech-bolt movable in the said receiver and a reciprocating bolt-operating slide mounted for reciprocation adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear operatively associated with the said trigger for being moved thereby and having a primary cockingabutment releasably engageable with the primary cocking-abutment of the said firing-member when the said trigger is released; a pivotal secondary sear having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firingrnember when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a reciprocating tertiary sear having a tertiary cocking-abutment releasably engageable with the tertiary cocking-abutment of the said firing-member; manuallyoperable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to effect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment of the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firing-member and permitting the relative movement of the secondary sear in the opposite direction; and means actuated by the said unit to retire the said tertiary sear as the said breech-bolt moves into its breech-closing position.

10. An automatic and semiautomatic firearm, including in combination: a receiver; a breechbolt movable in the said receiver; a reciprocating bolt-operating slide mounted for reciprocation adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abut? ment; a trigger; a primary sear operatively associated with the said trigger for being moved thereby and having a primary cocking-abutment releasably engageable with the primary cockingabutment of the said firing-member when the said trigger is released; a pivotal secondary sear having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a reciprocating tertiary sear having a tertiary cocking-abutment releasably engageable with the tertiary cocking-abutment of the said firing-member; manually-operable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to efiect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cocking-abutment oi the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firing-member and permitting the relative move- 15 ment of the secondary sear in the-opposite direction; and means carried by the said bolt-operating slide to retire the said tertiary sear as the said breech-bolt moves into its breech-closing position.

11. An automatic and semiautomatic firearm, including in combination: a receiver; a unit comprising a breech-bolt movable in the said receiver and a reciprocating bolt-operating slide mounted for reciprocation adjacent the said receiver and operatively connected to the said breech-bolt for moving the same; a spring-pressed firing-member provided with a primary cocking-abutment, a secondary cocking-abutment and a tertiary cocking-abutment; a trigger; a primary sear rigid with the said trigger for movement therewith and having a primary cocking-abutment releasably engageable with the primary cocking-abutment of said firing-member when the said trigger is released; a pivotal secondary sear yieldingly carried by the said trigger and having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a reciprocating tertiary sear having a rearwardlyfacing tripping-abutment and a tertiary cockingabutment releasably engageable with the tertiaiy cocking-abutment of the said firing-member; manually-operable control-means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to effect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cockingabutment of the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firingmember and permitting the relative movement of the secondary sear in the opposite direction;- and a forwardly-facing tripping-abutment carried by the said unit and engageable with the rearwardly-facing tripping-abutment of the said tertiary sear as the said breech-bolt moves into its breech-closing position to retire the said tertiary sear.

12. An automatic and semiautomatic firearm, including in combination: a receiver; a breech- .bolt movable in the said receiver; a reciprocatsaid trigger for movement therewith and hav-- ing a primary cocking-abutment releasably engageable with the primary cocking-abutment of the said firing-member when the said trigger is released; a pivotal secondary sear yieldingly carried by the said trigger and having a secondary cocking-abutment normally releasably engageable with the secondary cocking-abutment of the said firing-member when the said trigger is pulled and movable with respect to the said trigger for being held in a retired position; a reciprocating tertiary sear having a rearwardlyfacing tripping-abutment and a tertiary cockingabutment releasably engageable with the tertiary cocking-abutment of the said firing-member; manually operable control means engageable with the said secondary sear for releasably holding the same in a retired position; means operatively connecting the said secondary sear to the said trigger to effect the movement of the former by the latter, the said means including a spring yieldingly urging the secondary cockingabutment of the said secondary sear into position for releasable engagement with the secondary cocking-abutment of the said firingmember and permitting the relative movement of the secondary sear in the opposite direction; and a forwardly-facing tripping-abutment carried by the said bolt-operating slide and engageable with the rearwardly-facing trippingabutment of the said tertiary sear as the said breechbolt moves into its breech-closing position to retire the said tertiar sear.

HARRY H. SEF'RIED, II.

No references cited.

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742822A (en) * 1949-02-11 1956-04-24 Earle M Harvey Firing mechanism for automatic and semi-automatic firearms
US2823589A (en) * 1952-03-31 1958-02-18 Alonzo F Gaidos Selective fire converter and rate reducer
US3021763A (en) * 1959-05-23 1962-02-20 Beretta Pier Carlo Mechanism for converting a rifle from semi-automatic to automatic firing
US3045555A (en) * 1959-12-22 1962-07-24 Fairchild Engine & Airplane Automatic trigger mechanism with three sears and a rotatable control member
US3200709A (en) * 1964-02-17 1965-08-17 Alfred L Montana Firing mechanism with integral safety
US5012604A (en) * 1990-03-27 1991-05-07 Rogers Laurence B Trigger assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742822A (en) * 1949-02-11 1956-04-24 Earle M Harvey Firing mechanism for automatic and semi-automatic firearms
US2823589A (en) * 1952-03-31 1958-02-18 Alonzo F Gaidos Selective fire converter and rate reducer
US3021763A (en) * 1959-05-23 1962-02-20 Beretta Pier Carlo Mechanism for converting a rifle from semi-automatic to automatic firing
US3045555A (en) * 1959-12-22 1962-07-24 Fairchild Engine & Airplane Automatic trigger mechanism with three sears and a rotatable control member
US3200709A (en) * 1964-02-17 1965-08-17 Alfred L Montana Firing mechanism with integral safety
US5012604A (en) * 1990-03-27 1991-05-07 Rogers Laurence B Trigger assembly

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