US3123928A - Contractable shoulder arm with rifle and shotgun unit - Google Patents

Description

A. J. LIZZA March; 10, 1964 CONTRACTABLE SHOULDER ARM WITH RIFLE AND SHOTGUN UNIT 2 Sheets-Sheet l Filed Dec.

INVENTOR. I Alba-r1 J LIZZIL I BY g 7 0am1 9 afl w March 10, 1964 A. J. LIZZA 3,123,928

CONTRACTABLE SHOULDER ARM WITH RIFLE AND SHOTGUN UNIT Filed Dec. 13, 1961 2 Sheets-Sheet 2 INV EN TOR.

A1]: E :1 lLi ZZEL BY United States Patent M 3,1239% CONTRACTABLE SHttULDER ARM WITH LE AND SHOTGUN UNIT Albert J. Lima, 14 Linwood Drive, North Wilbraham, Mass., assignor to the United States of America as represented by the Secretary of the Army Filed Dec. 13, 1961, Ser. No. 159,191 2 Claims. (Cl. 42--72) (Granted under Title 35, US. Code (1.952), sec. 266) The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment of any royalty thereon.

This invention relates to firearms and more particularly to shoulder arms which are contractable either by telescopic or folding means to a small size.

In modern-type warfare there is a need for firearms which have the capabilities of shoulder arms but which may be carried as a small, compact package for inclusion in survival kits and for use by paratroopers and in guerrilla warfare where the conventional shoulder arm would be burdensome and hindersome.

It is, therefore, the object of this invention to provide a shoulder arm which includes a rifle unit with a rifled barrel of suflicient length to be reasonably accurate in use at long ranges and a shotgun unit with a short firing tube for infighting, with the firearm being contractable into a small-size package by having the stock telescopically mounted in the receiver and the front portion of the rifle barrel and the shotgun firing tube foldable relative thereto.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

FIG. 1 is an elevational view of the shoulder arm ready for firing;

FIG. 2 is an elevational view of the shoulder arm contracted;

FIG. 3 is a View taken along line 3-3 of FIG. 1;

FIG. 4 is a fragmentary, longitudinally, cross-sectioned view of the front portion of the receiver where the rifle barrel is separably mounted and the front end thereof is joined to the shotgun firing tube for pivotal displacement relative to the receiver with the barrel and firing tube in position for firing;

FIG. 5 is a View similar to FIG. 4 but showing the front section of the barrel and the firing tube partially pivoted away from the firing position; and

FIG. 6 is a view taken along line 66 of FIG. 5.

Shown in the figures is a shoulder arm 12 having a rifle unit 13 with a rifled barrel 14 and a shotgun unit 15 with a firing tube 16, which barrel and firing tube are supported by a receiver 18. Receiver 18 also supports a conventional, shotgun pump-action 2% for successively transferring a plurality of shells 22 from a magazine 24 into the rear end of firing tube 16 and ejecting the fired shells out of an ejection port 26 in the right side of the receiver. The shells 22 are discharged by a firing mechanism (not shown) by means of a trigger 28.

Receiver 18 also incloses a single shot action for the rifle unit which action includes a hand-cocked hammer 39 and a pivotal breechblock 32 for opening and closing the breech end of barrel 14 to permit the loading and the ejection of a cartridge (not shown) into the chamber of the barrel. A selector 38 mounted on the side of receiver 15 permits the selective discharge of the rifle or the shotgun unit by trigger 28 through conventional linkage means.

Shoulder arm 12 is supported for firing by means of a pistol grip 40 depending from receiver 18 rearwardly of trigger 28 and a telescopic stock 42. Stock 42 includes a shoulder piece 44 and a pair of laterally spaced, support- 3,123,928 Patented Mar. 19, 1964 ing braces 46 which are slidingly received by mating channels 48 formed in the sides of receiver 18. Ejection port 26 is formed in the right one of the channels 48 and the right one of the braces 5-6 is arranged to cover the ejection port when stock 42 is telescoped into receiver 18 and so provides a dust cover for the ejection port as seen in FIG. 2. Stock 42 is releasably secured in the extended position by conventional latching means as represented by latch 50.

Barrel 14 is separable into a front section 52 and a rear section 54. Rear section 54 is positioned vertically above receiver 18 and is secured thereto by a breech housing 56 which extends upwardly from the rear end of the receiver and a mount 58 integrally formed at the front end thereof. The breech end of rear section 54 is secured to breech housing 56 by conventional locking means (not shown) so as to be held against rotational and longitudinal displacement at a predetermined position. The front end of rear section 54 is received by a mating bore 59 which extends longitudinally through mount 58.

Bore 59 is interrupted by a lateral slot 66 which receives a knurled nut 62. Nut 62 is journaled on the front portion of rear section 54 and is prevented from longitudinal displacement by the contact thereof with the front and rear sides of the slot. Mount 58 also includes a pair of depending and laterally spaced lips 64 which are provided with laterally aligned holes 66 for receiving a pin 74 as by press fit.

Front section 52 of barrel 14 and tube 16 are fixedly mounted together by means of a rear bracket 68 and a front support 79 to form a front unit 71. Bracket 68 is provided with a depending L-shaped flange 72 having a longitudinally elongated hole 73 which slidingly receives pin 74, whereby bracket 68 is pivotally supported by mount 58 and is also permitted longitudinal displacement relative thereto. When bracket 68 is upwardly disposed and is displaced rearwardly on pin 74, it is received by a mating recess 76 in the front end of mount 58.

The rear portion of front section 52 is provided with a threaded section 78 which extends rearwardly from an integral hexagonal flange 86 and is engageable with a threaded aperture 82 in bracket 68. Flange provides means for turning front section 52 by wrench means and is contactable with the front of bracket 68 for locating front section 52 longitudinally relative thereto. The threads of threaded section 7 8 are qualified relative to the riding in front section 52 and rear section 54, when in the locked position, so that, when the front section is drawn up to where flange 86 crushes against bracket 68 and qualifying marks 34 on the flange and bracket align, the rifling in the front and rear sections are in alignment.

The end of threaded section 78 is arranged to extend from bracket 68 so that such extension 86 is engageable by nut 62 to draw front section 52 rearwardly against mount 5% and so ready shoulder arm 12 for firing.

The rear end of front section 52 is counterbored at 88 to an annular shoulder 9% and the front end of rear section 54 is reduced in diameter to form a tongue 92 which is matingly received by counterbore 88, when front section 52 and rear section 54 are drawn together, to provide a strong and gas tight joint therebetween.

Firing tube 16 is fixedly mounted to bracket 68 similar to front section 52 and is arranged so that the breech end extends past the bracket for projection into receiver 18 so as to receive shells 22 chambered by pump-action 20. The front ends of firing tube 16 and front section 52 are fixed to front support ill as by press engagement with mating holes provided therein. When front unit 71 is folded under receiver 18, the muzzle ends of front section 52 and firing tube 16 are received by hand grip 40, which is hollow formed, through an opening 94 which extends along the bottom and front side thereof. A latch 96 releasably holds front section 52 and firing tube 16 in the folded position.

Thus, shoulder arm 12 may be contained in a small package when stock 42 is telescoped into receiver 18 and front unit 7]. is folded thereunder. When shoulder arm 12 is to be used, stock 42 is extended and front unit 71 is unfolded and swung up to where threaded section 78 contacts nut 62. Nut 62 is then turned to threadingly engage threaded section 78 and draw front unit 71 rearwardly with tongue 92 entering counterbore portion 88 and the breech end of firing tube 16 entering receiver 13. The longitudinal displacement of front unit 71 into solid contact with mount 58 is possible through the longitudinal elongation of hole 73. When nut 62 is tightened, front section 52 and rear section 54 are solidly joined to complete barrel 14 and firing tube 16 is in position for firing. When shoulder arm 12 is to be contracted, the abovementioned steps are reversed.

From the foregoing it is clearly apparent that there is provided herein a shoulder arm which successfully combines a rifle unit with a shotgun unit and which is contractable to a small size.

Although a particular embodiment of the invention has been described in detail herein, it is evident that many variations may be devised within the spirit and scope thereof and the following claims are intended to include such variations.

I claim:

1. A contractable shoulder arm includinga receiver, an ejection port in said receiver, a rifle barrel mounted over, said receiver so as to extend forwardly therefrom, a shotgun firing tube mounted in said receiver so as to extend forwardly therefrom, means for contracting the shoulder arm at the front end of said receiver, a stock, and means for telescopically mounting said stock in said receiver, said means including a pair of supporting braces one of which is arranged to cover said ejection port when said stock is telescoped in said receiver.

2. A contractable shoulder arm including a receiver, a separable rifle barrel including a rear section mounted on said receiver and a front section extending forwardly therefrom when joined to said rear section, a shotgun firing tube, means for mounting said front section and said firing tube together and to said receiver so as to be foldable together thereunder, said means including a mount on the front end of said receiver, a longitudinal bore provided in said mount for receiving the front end of said rear section, a lateral slot formed in said mount so as to interrupt said bore, a nut journaled on the front end of said rear section in said slot, a bracket for mounting the rear ends of said front section and said firing tube, means for hingediy mounting said bracket to said mount for pivotal and longitudinal displacement so as to bring said front section into alignment with said rear section when swung from the position where folded under said receiver, a threaded section formed on the rear end of said front section arranged for threaded engagement with said bracket and to form an extended portion projecting therefrom for engagement with said nut to draw said front section and rear section together, a counterbore formed in the rear end of said front section and a concentric tongue formed on the front end of said rear section so as to project into said counterbore to form a strong and gas-tight joint thereoetween when said front and rear sections are drawn together, a stock, and means for telescopically mounting said stock to said receiver.

References Cited in the file of this patent UNITED STATES PATENTS 570,145 Pittavino Oct. 27, 1896 652,583 Baird June 26, 1900 2,200,780 Schmeisser May 14, 1940

Claims (1)

1. A CONTRACTABLE SHOULDER ARM INCLUDING A RECEIVER, AN EJECTION PORT IN SAID RECEIVER, A RIFLE BARREL MOUNTED OVER SAID RECEIVER SO AS TO EXTEND FORWARDLY THEREFROM, A SHOTGUN FIRING TUBE MOUNTED IN SAID RECEIVER SO AS TO EXTEND FORWARDLY THEREFROM, MEANS FOR CONTRACTING THE SHOULDER ARM AT THE FRONT END OF SAID RECEIVER, A STOCK, AND MEANS FOR TELESCOPICALLY MOUNTING SAID STOCK IN SAID RECEIVER, SAID MEANS INCLUDING A PAIR OF SUPPORTING BRACES ONE OF WHICH IS ARRANGED TO COVER SAID EJECTION PORT WHEN SAID STOCK IS TELESCOPED IN SAID RECEIVER.

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