US2848831A

US2848831A - Pistol

Info

Publication number: US2848831A
Application number: US588811A
Authority: US
Inventors: Neill S Mclaughlin
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-06-01
Filing date: 1956-06-01
Publication date: 1958-08-26
Anticipated expiration: 1975-08-26

Description

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Loraine (sim-41o This invention relatesto' f'rearrrisg-arrdv more particularly^toa pistoll employing-a recoil-ing unitary vtiring pin'- bolt:

A- pistolmade according-to the present invention in. cludes; asolid -cylindrical -boltwhich carries a firing.; pinintegrally connectedto, andY extending forwardly off a hat-'circular` forward surface ofsaidE boltc- The bolt; isslidably` situatedfinaereceiver ofi the pistol and` aunitary triggerwand sea-rare f pivotallyk mounted tosaidV receiver; to permit the sear portion thereoftto extend; throughan opening in the receiver torcontact ,saidVv forward. surface of the bolt when said pistol is in a cocked' condition. Movement of a. trigger finger portionaofsaid trigger will cause the sear; t-o be withdrawn from,l contact?.with? the bolt; and a,mainspringA forces the boltforwardlyimthe receiver.- to.. bring said firingpinimoperational,Contact with;a cartridge in a barrel of said .pistol. Theexplosion;l of; said.cartridg e forces a bulletiout of the=barrel and the recoil from this explosion causes the cartridge shell to force the bolt rearwardly until the shell is positioned entirely outside of the barrel. As the bolt 'comes forward under the action of the mainspring, the shell will be trapped between the bolt and the end of the barrel inside of the receiver.

Such a pistol Will find use primarily as a target pistol where extreme accurary and extreme simplicity of operation are desired. Since the entire rearm includes only two moving parts it is to be understood that it can be produced and sold most economically.

In the drawings,

Fig. 1 is a side elevational view of a pistol made according to the present invention with parts in section and parts broken away; and

Fig. 2 is a fragmentary vertical sectional view of the pistol of Fig. 1 but with the parts in different positions.

Referring to the drawings and the numerals of reference thereon, a pistol includes a tubular receiver 11 and a barrel 12 threadably mounted in said receiver. A grip 13 is removably mounted to the receiver through the instrumentality of a screw 14. A trigger member 15 consists of a trigger arm 16, a sear 17 integral with and extending upwardly from a forward portion of said trigger arm 16, a pivot arm 18 integral with and extending upwardly from a rearward portion of said trigger arm, and a trigger finger piece 19 integral with and extending downwardly from a central portion of said arm. The trigger member 15 is pivotally mounted to the receiver 11 by a pivot pin 20 extending through said receiver and said pivot arm 18 of said trigger member.

A first slot 21 in the receiver 11 is for the purpose of allowing pivot arm 18 to extend into the receiver and have pivotal movement relative thereto. A second slot 22 in the receiver 11 is to allow sear 17 to enter into the receiver. The grip 13 is cut away to provide a cavity 23 to allow limited pivotal movement of said trigger member 15 with respect to the receiver 11.

A cylindrical bolt 24 is slidably mounted in the receiver 11 and is provided with a flat circular surface 25 2,848,831 Patented Aug. 26, 1958 ata; forward end thereof.' A tiring pin 26 is. integral with said surfaceC 25 and extends outwardlytherefrom.

A bolt pull rod'27f is threa-dably mounted in the boltv 24'land ay boltpul1 rodhandle 28- is iixedly attached there-y to.A A receiver-plug29 is th'readably situated inthe rear endTv of the receiver 11' and arrA openingetherethrough al'- lows slidable movement of'the bolt` pull rod'27"there` through. A mainspring 30 encirclesY the pull rod 27 between the receiver plug 29 and the bolt 24 and tends to: urge the bolt.'v in directiony toward the barrel 12. A

tubularstop member 31 is-r iixedly positioned with reev spect to thereceiven 1'1- toV have one=end' thereof in contact with the receiver plug 29 and the other end extend'- ing in direction towardthe'barrel 12. The tubular stop member-is-'cut away at a lower'rearward portion-thereof as.l indicated at 32 to-` allow; clearance for pivota1'move ment of the pivot arm 1'8 of the trigger member 15.

A forward at discoid endsurface- 32is designed tocon Operation In operation,- the;.grp-13.--is; lir'mly heldin one; hand and theboltgpull; rod handleglsdsmoved in: a rearward drCGtOI1f-With :ther Otherffhands. When; this=.movement of the pull rod 27 causes the cylindrical bolt 24 to reach position approximately as shown in Fig. 1, the sear 17 will move up through the slot 22 into the path of the bolt 24 under the urging of the trigger spring 34. The handle 28 is then released and the mainspring 30 causes the bolt 24 to move in forward direction until the forward surface 25 4of said bolt comes in contact with the sear 17 and is arrested thereby.

With the parts positioned as seen in Fig. 1, a cartridge 36 is inserted through the opening 35 in the receiver 11 into the barrel 12 as seen in that ligure. The gun can then be sighted in the usual manner through the rear sight 37 and the forward sight 38 which are integrally mounted on the receiver 11 and the barrel 12 respectively.

As the trigger finger piece 19 is squeezed, the scar 17 will be moved in downward direction until a point is reached where the cylindrical bolt 24 is no longer retained thereby. At this time, the mainspring 30 will propel the bolt rapidly forward and will bring the firing pin 26 into sharp striking contact with the percussion cap of the cartridge 36 thus ring the cartridge. The firing of the cartridge will, of course, cause the bullet 39 to be ejected out of the gun barrel 12 at the forward end thereof. The recoil action will result in the cartridge shell 40 riding back with the bolt 24. The energy of this recoil action is absorbed partially by the action of the mainspring 30 and partially by the mass of the bolt itself. The explosive charge of the bullet, the strength of the mainspring 30 and the mass of the bolt 24 are so proportioned that the rearward action of the cartridge and the bolt will normally and preferably be arrested at position when the cartridge shell 40 is entirely outside of the barrel 12 but before the rearward end surface 33 of the bolt 24 comes in contact with the forward end surface 32 of the tubular stop member 31. In the event that the charge in a particular cartridge is such that the bolt 24 does not stop before reaching the tubular stop member 31, the forward surface 32 Iof said stop member will receive the remaining force of the bolt and.

this shock will be transmitted through the stop member to the receiver plug 29, the receiver 11 and the remainder of the pistol.

As soon as the rearward motion of the bolt 24 is overcome, the mainspring 30 will quickly force it in forward direction again. Since the cartridge shell 40 is now outside of the barrel, the forward edge thereof is no longer in alinement with the barrel and the cartridge shell will come to rest in position between the barrel and the bolt 24 somewhat as indicated in dotted lines in Fig. 2. The corresponding position of the bolt 24 and of the pull rod handle 28 are also indicated in dotted lines in this gure. To eject the shell from the pistol, the pistol is inverted and the pull rod handle 28 is again retracted to allow the shell 40 to fall from the receiver 11 through the opening 35.

The pistol is then again ready to be reloaded. In the usual situation, the handle 28 will be moved in rearward direction, the gun will be momentarily inverted to remove the expended shell 40 and the rearward movement of the handle 2S will be continued until the gun is again cocked as seen in Fig. 1.

As will be understood, the action and function of the tubular stop member 31 is three fold. First, it serves to limit the rearward movement of the bolt 24. Secondly it protects the mainspring 30 from damage due to overcompression should the bolt 24 continue in its rearward movement. Thirdly, it protects the pivot arm 18 of the trigger member 15 from damage in the event the bolt 24 should move rearwardly to that position.

What is claimed is: In a fire arm, a tubular receiver having longitudinally alined trigger arm and sear openings extending through a wall thereof; a receiver plug at a rear end of said receiver; a barrel xedly mounted in said receiver at a forward end thereof; a bolt constituted as a solid cylindrical block slidably mounted within said receiver and having at circular, forward and rear end surfaces; a ring pin integral with and extending forwardly of said forward surface of said block; a tubular stop member xedly mounted in said receiver in contact with said receiver plug in position to have a forward end thereof limit rearward movement of said bolt; said stop member having a trigger arm opening therethrough in radial alinement with said trigger arm opening of said tubular ren. ceiver; a compression main spring extending through said stop member and bearing on said plug and said bolt to urge said bolt in a forward direction; a bolt pull rod ixedly mounted in the rear end of said bolt and extending through said compression coil spring, said tubular stop member and said receiver plug; a trigger arm pivot pin positioned between an outer cylindrical surface of said receiver and an inner cylindrical surface of said stop member and within said trigger arm openings in said receiver andY said stop member; a trigger member having a trigger arm supported on said trigger arm pivot pin for pivotal movement with respect to said receiver, havinga s'ear `integral with and extending outwardly from said trigger arm to position within said sear opening in said receiver, and a trigger finger piece; and a trigger spring biasing said trigger member to tend to position said searpwithin said receiver to intercept said forward surface ofrsaid bolt.

i References Cited in the le of this patent UNITED STATES PATENTS 1,851,696 Ekdahl Mar. 29, 1932 2,049,776 Hyde Aug. 4, 1936 2,464,409 Mossberg Mar. 15, 1949 2,618,878 Mulno Nov. 25, 1952 2,659,994 Yale Nov. 24, 1953