Патент USA US2407528код для вставки
Sept 130, 59%‘, G. N. ALBREE ‘ FIRING MECHANISM FOR FIREARMS - .iwWW3%8.5m5 Rs Filed 001;. 21, 1944 > ‘ 2,407,526‘ 2,407,526 Patented Sept. 10, 1946 UNITED STATES PATENT OFFICE ' 2,407,526 FIRING MECHANISM FOR FIREARMS George Norman Albree, Winchester, Mass. Application October 21, 1944, Serial No. 559,757 6 Claims. (Cl. 42-3) 1 2 This invention relates to ?rearms and particu larly to the ignition system, that is, to the ele ments employed for detonating the chambered It should be understood, however, that the in 20. The breech closure is herein shown in the form of a, breech bolt 6 which is movable from open to closed position as usual in ?rearms, said bolt being backed by the usual recoil spring, which however, is not herein shown. The ?rearm illus trated is a magazine arm, and a portion of the magazine is shown at 24. The ?ring pin which is carried by the breech bolt 6 is shown at 8 and it is provided with the forwardly extending end H which is adapted to have a detonating impact against the primer of the cartridge 2t. Said ?ring pin is carried by a vention is not limited in its use to ?rearms of the above type, as certain features of the invention rocking element 1 which is received within a re cess 253 with which'the front end of the breech are equally applicable to arms of other types. One object of the invention is to provide a ?re~ arm in which the ?ring pin is connected to a rocking member that is carried by the bolt and which has rocking engagement with a rocker bolt is provided, and it operates through an open ing 28 formed in the face of the bolt and com cartridge. In order to give an understanding of the inven tion I have illustrated it herein as it might be embodied in an automatic arm of the straight inertia blowback type, the ‘breech of which is kept closed while the bullet is in the barrel lby the in ertia of the heavy bolt coupled with its recoil ' spring. suppo-rting face with which the breech closure is ' provided, together with means for rocking said member over said face to produce the detonating impact of the ?ring pin, the construction being such that during such rocking motion of the rock ing member, the lever arm thereof that carries ~ municating with said recess 29. . The ?ring pin 8 is shown as pivotally mounted on the rocking member '5, said member being slotted at its lower end to receive the ?ring pin and being provided with a pivot pin 9 on which the ?ring pin is mounted. The rocking member i normally rests loosely against the bottom wall 33 of the recess 29, said wall constituting a, rocker-supporting face for the rocking movement of the rocking the ?ring pin has a progressively increasing member as will be presently described. length as said rocker is actuated, whereby the The rocking member 7 has a ?at rear surface forward impact-producing movement of the ?ring ill at its lower portion to which the ?ring pin is pin relative to the bolt is an accelerated move pivotally connected, and the rear face of the ment which increases the hammer-blow effect of 30 upper end of said rocking member presents a the ?ring pin in detonating the primer. curved surface ‘FR which has a rocking contact A further object of the invention is to provide with the face 33 of the recess 29 as will be pres ently described. The rocking member ‘I is nor a novel means for cushioning the impact of the mally held in its retracted position shown in Fig. bolt against the breech face when the bolt is closed. 1 by means of a spring In, one end of which is Further objects of the invention are to provide received in a recess 3| formed in the front face a relatively simple ignition system comprising of the rocking member 1 and the other end of few and rugged parts and to otherwise improve which is received in a recess 32 formed in the the cartridge-detonating means of a ?rearm in breech bolt. the particulars hereinafter set forth. Means are provided for giving the rocking In the drawing: member 1 its rocking motion over the face 33 and Fig. 1 is a fragmentary sectional view showing while the character of such means may vary in a ?rearm embodying my invention, different types of ?rearms, yet in connection with Fig. 2 is a section on the line 2—-2, Fig. 1. Fig. 3 is a section on the line 3-3, Fig. 1. Inasmuch as the invention relates to the means for detonating the cartridge, I have not thought the ?rearm herein illustrated the rocking mem ber l’ is given its rocking movement during the ?nal closing movement of the breech bolt.‘ Such rocking motion of the member 1 is a quick rock ing motion on the face 33 of the recess 29, thereby it necessary to illustrate herein a complete ?re arm. but have only shown a suf?cient portion of projecting the end H of the ?ring pin forwardly such an arm to permit my invention to be under 50 through the opening 28 and into detonating con stood. tact with the primer of a cartridge 2| in the In the drawing 4 indicates the receiver of a chamber 20. ?rearm and 5 is the breech end of the barrel which is mounted in the receiver, said barrel Such means is in the form of an abutment or stop member l4 carried by the receiver and hav having the cartridge-receiving or ?ring chamber ‘e. U: ing'a portion l3 adapted to engage the face I2 2,407,526 3 4 at the outer end of the rocking member ‘I dur ing the ?nal closing movement of the breech bolt and just before the bolt is fully closed. The en gagement of the face :2 with the abutment or stop member II! will give a counterclockwise rocking movement to the rocking member ‘I dur ing which the curved face ‘IR of the rocking mem member ‘I is such as to give the ?ring pin a hammer-like impact against the primer- The hammer-blow effect of such impact is increased by reason of the fact that during the rocking mo~ tion of the member ‘I the fulcrum point is rap idly and progressively moving toward the outer end of said member. The detonation of the cartridge will occur her will have a rocking or rolling motion on the during the forward movement of the bolt and ?at supporting face 33, such rocking motion ob viously moving the ?ring pin 8 forwardly rela 10 just before it is fully closed. The gas pressure developed by the ?ring of the cartridge not only tive to the bolt. forces the bullet through the barrel but it also The rocking motion of the rocking member 1 applies a back pressure to the bolt which is still is similar to that of a rocking chair when it is moving forward. By the time the bullet has being rocked on the ?oor, that is, the curved face ‘IR of the rocking member has a sort of rolling 15 been discharged from the barrel and the bolt has reached its closed position, the residual pres motion along the supporting face 33 of the breech sure will drive the bolt backward to its open po bolt, during which rolling motion the point or sition against the action of its recoil spring. line of contact between the faces 'iR and 33 ad When the bolt reaches its open position, the next vances along both faces. The fulcrum about which the rocking member is turned at any given 20 cartridge ZIM has moved up into position to be engaged by the bolt during its next forward instant is the line of contact between said faces movement, and the operation above described will ‘IR and 33, and during the operative rocking be repeated. movement of the rocking member 7 by which Since the detonation of the cartridge occurs the end II of the ?ring pin is given its detonat during the forward movement of the bolt and ing impact against ‘the primer, such fulcrum pro just before it is fully closed, the pressure devel gresses from a point near the center of the rock oped by such detonation will have a retarding ing member toward the outer end thereof. The action on the last increment of the closing move fulcrum point about which said rocking member ment of the bolt, thereby producing a cushion ‘I turns during its rocking motion will thus s lift effect for the bolt. progressively rapidly toward the outer or upper 30 ingThe rocking motion which the rocking member end of said member ‘I as the rocking motion con ‘5 has when it is engaged by the stop member I4 tinues, and because of this the lever arm of the serves to compress slightly the spring I0, and the member ‘I which carries the ?ring pin is one resiliency of this spring together with the pressure which has a progressively increasing length dur against the ?ring pin produces a rebound action ing such rocking motion. This results in giving of the ?ring pin which restores it to its normal to the ?ring pin an accelerated operative move ment relative to the bolt. The striker abutment or stop member I4 is shown as occupying a recess 38 with which the re ceiver is provided and as having rigidly secured thereto a button element I5 which is of a size to span the recess 30. In’the construction shown the recess 30 is somewhat longer than the abutment or stop element, and said element is backed by a spring which normally holds it in its operative po sition shown in Fig. 1. For this purpose, there is provided a pin i8 operating in a recess I‘! with which the barrel 5 is provided, said pin having a duced portion I9 that is ?tted into a recess in the abutment or stop element It. The pin I8 is backed by a spring I6 which occupies the recess. In the operation of the ?rearm when the breech bolt 6 is in its fully retracted position, the top cartridge 2| M in the magazine 24 will move up wardly into a position to. be engaged by the bolt as it moves forward and during such forward movement of the bolt it will strip the top car tridge from the magazine as shown in Fig. l and carry the cartridge into the chamber 26 of the position immediately after the ‘detonation takes place. The recess 29 in which the rocking member ‘I is loosely received, may be provided for in various ways. As herein shown, the breech bolt is made with a vertically disposed slot in its end face and the bottom of the slot is permanently closed by a plug or block member 6a which forms the bottom 4. Q1 of the recess. The front portion of the slot is also closed by a block 5b which is permanently secured in the open end of the slot and which has the opening ZSthrough which the end I I of the ?ring pinv is projected. This block 82) terminates at a point below the upper side of the breech bolt thereby leaving the opening 21 to receive the portion I3 of the abutment or stop member dur ing the ?nal closing movement of the breech bolt. I claim: 1. A ?re arm comprising a barrel having a ?ring chamber, a breech closure movable from open to closed position and having a rocker-supporting face extending transversely to the direction of movement thereof and facing toward the ?ring barrel. During this movement, the rounded end 60 chamber, a rocking member, one face of which has a convexly curved section adjacent one end of the bullet 22 is guided into the chamber by the thereof, a ?ring pin carried. by the other end of usual bevel portion 23 of the barrel. Fig. 1 shows the rocking member, said breech closure having the cartridge just entering the chamber 25'}, and provision for supporting the rocking member with it also shows the ?ring pin in its retracted posi tion. Just before the breech bolt reaches its 65 its said face loosely resting against and for rolling contact over said rocker-supporting face, and closed position, the portion 63 of the abutment means to engage the ?rst named end of said rocking member and to rock said member over the rocker-supporting face with a rolling as dis movement, the rocking member ‘I will be turned .by its engagement with said abutment member 70 tinguished from a sliding contact therewith and member I4 will engage the face I2 of the rock ing member 7 and during the very ?nal closing I4, thereby projecting the ?ring pin forward thus impart to the ?ring pin an accelerating deto through the opening 28 and into contact with nating movement. the primer in the cartridge 2 I. The bolt is moved 2. A ?re arm comprising a barrel having a ?ring rapidly forward by its recoil spring, and the ima chamber, a breech bolt movable from open to pact of the stop member I4 against the rocking 75 closed position and having a rocker-supporting 2,407,526 5 face extending transversely to the direction of movement thereof and facing toward the ?ring chamber, a rocking member having a face which is convexly curved at one end thereof, said breech bolt having provision to support the rocking mem ber with its said face loosely resting against and 6 at one end, a ?ring pin carried by the rocking member, means operative during the ?nal closing movement of the breech bolt to engage the rock ing member at a point spaced from the ?ring pin and to give the rocking member a rolling motion over said supporting face with the con for rolling contact over said rocker-supporting vexly curved section of the rocking member hav ing a rolling, as distinguished from a sliding, con face, a ?ring pin carried by the other end of the tact with said supporting face. rocking member, and means to deliver a hammer like blow to the ?rst named end of the rocking 10 5. A ?re arm comprising a receiver, a barrel member and to give said member a rolling motion having a ?ring chamber, a breech bolt movable over said supporting face, during which rolling from open to closed position and having a recess motion the line of contact between said convexly adjacent its front end, one wall of which recess curved face of the rocking member and the sup constitutes a rocker-supporting face which ex porting face, which line of contact constitutes the tends transversely of the direction of movement of said breech bolt and faces toward the ?ring fulcrum about which the rocking member turns, advances progressively toward the ?rst named chamber, a rocking member loosely received in said recess and resting against said supporting end thereof and the length of the lever arm of said member which carries the ?ring pin is cor face, the face of said rocking member which con tacts said supporting face having a convexly respondingly progressively increased, 3. A ?re arm comprising a barrel having a ?ring curved portion, a stop member carried'by the receiver and adapted to engage said rocking mem chamber, a breech bolt movable from open to closed position and having a rocker-supporting her during the ?nal closing movement of the bolt, face extending transversely to the lengthwise di and give said member a rolling as distinguished mension of the bolt and facing toward the ?ring 25 from a sliding motion over said supporting face, and a firing pin actuated by such rolling motion. chamber, a rocking member, said bolt having pro vision for supporting the rocking member loosely 6. A ?re arm comprising a receiver, a barrel against said face, a ?ring pin carried by the having a cartridge chamber, a breech bolt mov able from open to closed position and provided rocking member, one of the contacting faces of the breech bolt and rocking member being a flat - adjacent its front end with a recess, the bottom face and the other having a convexly curved por wall of which extends transversely of the direc tion, and means operative during the ?nal closing tion of movement and faces toward the cartridge movement of the breech bolt to engage the rock chamber, a rocking member in said recess resting ing member and to give the latter a rolling move loosely against said bottom wall, the face of the ment over said rocker-supporting face, during 35 rocking member which engages said bottom Wall being convexly curved adjacent one end thereof, which there is a rolling contact between the con vexly curved face and the flat face and the ?ring a ?ring pin at the other end of the rocking mem pin is given an accelerated detonating movement. her, a yielding stop member carried by the receiver 4. A ?re arm comprising a barrel having a ?ring in position to engage the ?rst named end of the chamber, a breech bolt movable from open to 40 rocking member during the ?nal closing move closed position and having a rocker-supporting ment of the bolt, and to give the rocking member face extending transversely thereof and facing a rolling motion over the bottom face of the re cess and thus impart to the ?ring pin a primer toward the ?ring chamber, a rocking member detonating impact. loosely resting against said face, the face of said rocking member which contacts with said rocker 45 supporting face having a convexly curved portion GEORGE NORMAN ALBRE-E.