US2601033A - Breech mechanism for air guns - Google Patents

Description

June 17, 1952 A. LAWRENCE 2,601,033

BREECH MECHANISM FOR AIR GUNS Original Filed Feb. 28, 1946 INVENTOR. ANDREW LAWRENCE Patented June 17, 1952 BREECH MECHANISM FOR AIR GUNS Andrew Lawrence, New York, N. Y., assignor of one-half to Stephen E. Laszlo, New York, N. Y.

Original application February 28, 1946, Serial No.

650,771. Divided and this application September 8, 1949, Serial No. 114,593

2 Claims. 1

This invention relates to breech mechanism for pneumatic guns and provides a simple and effective means for opening and closing the breech of air guns and the like.

The present application is a division of application Serial No. 650,771, now Patent No. 2,525,689, filed February 28, 1946.

An embodiment of the invention is illustrated in the accompanying drawings. The invention may be embodied in other constructions of pneumatic guns than that specifically illustrated and described herein.

In said drawings,

Figure 1 is a View of a pneumatic gun, embodying the present invention, partly in side elevation and partly in vertical section, showing the parts in loadin position.

Figure 2 is a transverse sectional view of the breech mechanism shown in Figure 1.

Figure 3 is an enlarged sectional view of the breech end of Figure 1.

Referring to said drawings, numeral l2 designates a frame, which is provided with a stock or hand-grip l6, and associated with a barrel pivoted to the frame.

Numeral 22 designates a pneumatic cylinder in which air is compressed. In the construction shown, the pneumatic cylinder 22 is pivoted to the frame as indicated at l4, and within the pneumatic cylinder is a piston 26 against which acts a spring 32, which, when released after being compressed, causes the piston 26 to compress air in the rear part of pneumatic cylinder 22.

Numeral 24 designates a barrel tube which is suitably arranged at its rear to communicate with the pneumatic cylinder 22. In the particular arrangement shown, the barrel tube is arranged concentrically of cylinder 22, and passes through piston 26 and spring 32.

At the rear of the pneumatic cylinder is a breech-piece 38. Threaded on breech-piece 38 is a breech cap 43, havin a hole 42 therein concentric with the bore in the barrel 24, through which hole bullets or pellets are placed in the bore of said barrel. Pivoted to one of said breech parts, 38 or 40, as indicated at 43, is a breech-block 45, which bears on the breech-piece 38 in its closed position. The breech-piece 38 may, however, be provided with a packing annulus 48 against which the breech-block 45 directly bears.

Breech block 45 has an opening 41 which registers in its open position with the bore in barrel 24, and also with the hole 42 in cap 40.

A connection is provided for entraining the breech-block 45 with the rotation of cap 40, so

2 that the breech-block is moved by the cap to a position to open or close the breech piece to the outside. Such a connection is advantageously provided by a coil of a spring 52, attached at one end to the breech-block and at its free convolution bearing frictionally against the inside of cap 40. Turning of cap 40 simultaneously turns the breech-block on its pivot 43 to close the breechpiece by moving opening 41 out of register with the bore of barrel 24 and pressing the breechblock against the breech-piece 38; by reversing the operation just described the breech is opened.

Operation To insert a bullet into the breech, the cap 4|] is turned, causing the breech-block 45 to be turned on its pivot 43 by the drag of sprin coil 52 on the cap, and the hole 41 in the breech-block is thus brought into register with the bore of barrel 24. A bullet is then inserted through the hole 41 into the bore of barrel 24, and the cap 4!] turned in reverse direction to turn the breech-block 45 on its pivot to closing position. This carries the hole 41 out of register with the bore of barrel 24. Simultaneously with the turning of the breechblock, the cap 40 acts to press the breech-block against the breech-piece 38 (or the packing annulus 46 thereon) and thus close the breech. This pistol is now in condition for a second shot.

The invention is applicable to air-rifles, and the word pistols in the specification and claims is not to be understood as excluding air-rifles.

What is claimed is:

1. A pneumatic pistol comprising a barrel, a pneumatic cylinder and a spring pressed trigger controlled piston therein, the rear end of said barrel being in communication with said cylinder and receiving compressed air therefrom, a breech-piece at the rear of said barrel having a breech opening therein through which bullets may be passed into the rear end of said barrel, a cap on said breech-piece, interconnecting threads between said cap and breech-piece, an opening in the rear of said cap in line with the opening in said breech-piece and the rear end of said barrel, through which bullets may be passed, a breech block pivoted on said breech piece and located within said cap at the rear of said breechpiece, and a connecting part on said breech-block making contact with said cap, said cap, when manually turned, acting through said connecting part to turn said breech-block on its pivot to and from a position closing the bullet loading opening in said breech-piece, the direction of said threads and the direction of turning of said cap being related to simultaneously move said breechblock to breech-closing position and to move said cap against said breech-block and the breech-block against said breech-piece to tightly close the bullet-loading opening in said breechpiece against the escape of compressed air.

2. A pneumatic pistol, according to claim 1, whereinsaid connecting parhbetween said-= pap and breech-block is a spring attached to said breech-block and frictionally engaging said ,oap,

entraining the movement of said breech-block with the movement of said cap.

ANDREW LAWRENCE.

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

UNITED STATES PATENTS

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