US1550758A - Cut-off mechanism for firearms - Google Patents

Description

Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

CARI GUSTAF SWEBILIUS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR T0 THE MARLIN FIREARMS CORPORATION, OF NEW HAVEN, CONNECTICUT, A CORPORATION OF DELAWARE. v

CUT-OFF MECHANISM FOR FIREARMS.

Applicationled April 4, 1922.- Serial' No. 549,411.

. To all 'whom it may concern.'

Be it known that I, CARL G. SWEBILIUs, a citizen of the United States of America` residing at New Haven, in the county of New Haven, State of Connecticut, have invented certain new and useful Improvements in Cut-Off Mechanisms for Firearms, of which the following is a full, clear, concise, and exact description.

This invention relates to firearms and particularly to an improved means for controlling the feeding of cartridges from the magazine to the carrier in repeating shot guns of the general type disclosed in the U. S. Letters Patent to L. L. Hepburn, 943,828 granted December 21, 1909 to which patent attention is directed for a detailed description of the construction and operation of the main working parts.

Repeating firearms of this type have a tubular magazine communicating with the receiver and it has been the practice to provide a cartridge cut olf member and a cartridge release member for controlling the feeding of cartridges from the magazine to the carrier.

It is an object of this invention to improve upon the structure arrangement and means of operating the cartridge cut ofi member.

Another object of the invention is to so arrange the cut off member that it is in its vinoperative position only when the breech of the gun is closed.

Another object of the invention is to locate the cut ofi' member on the opposite side of the receiver from the release member and to so arrange the means for o erating it that the magazine may be emptie of shells with the minimum effort.

Other objects and novel features of the invention will be apparent from the following specification and accompanying drawings, in which Fig. 1 is a side elevation of the receiver with the carrier removed and the breech bolt near its rear position, the removable side plate being partially broken away;

and Fig. 2 is a plan view, partially in section of the receiver with the removable side wall and breech bolt in position, the section being taken partially through the lower portion of the action rod and partially above the lower edge of the ejection opening, and Fig. 3 is a section on line 3-3 of Fig. 2.

The receiver 10 comprises an integral side wall 11 anda removable side wall 12. Attached to the rear wall of the receiver is the stock 13 and threaded in the front wall is the barrel 14. Arranged beneath the barrel 14 and communicating with the lower portion of the receiver is a tubular magazine 15 from which the cartridges are fed to a carrier, not shown, which in turn presents the cartridges in position to be chambered by the breech bolt.

In the wall 11 is provided a slot in which slides the action rod 16, the rear under portion of which is cut away to form a groove 17 which terminates at its forward end in an oblique shoulder 18. A cartridge release member 19 is pivotally mounted on a pin 2O in a suitable groove in the wall 12. This member has a lug 21 on its forward end which is adapted to extend into the path of a cartridge passing from the magazine to the carrier, to act as a stop. From the rear end of the member 19 there extends upwardly an arm 22 which projects beyond the lower edge of the action rod slot and which is adapted to extend into the groove 17 and be engaged by the shoulder 18 to rock the member 19. A spring 23 presses the forward end of the member 19 toward the interior of the receiver. Vhen the action rod is in its forward'position the lug 21 is projected into the path of a cartridge by the spring 23 and the arm 22 lies in the groove 17. As the action rod is moved rearwardly, the oblique shoulder 18 engages the arm 22 and rocks the member 19, thereby removing the lug 21 from the path of a cartridge to allow the magazine sprinfr (not shown) to thrust the cartridge onto t 1e carrier.

In a slot in the removable side wall 12 is pivotally mounted a cut-ofi3 member 24 which has a lug 25 adapted to be projected into the path of a cartridge by the spring 26. The lug 25 is arranged closer to the mouth of the magazine than is the lug 21 so that a cartridge first engages the lug 21 in its travel from the magazine to the carrier. The upper front portion of the side wall 12 is cut away to ,form an ejection opening for exploded shells. The upper inner portion of wall 12 is cut away to provide a shoulder 26 on which slides the closure 27 for the ejection opening, the closure being attached to and movable with the breech bolt 28. The upper end of the cut-olf member 24 extends slightly above the shoulder 26 and is cut away to provide a lug 30, the face of which adjacent the wall 12 is adapted to be engaged by the tapered front edge of the closure 27 to rock the member 24 thereby removing the lug from the path of a cartridge and allowing the magazine spring to feed a cartridge against the lug 21.

The operation of this devlce is as follows: n

Starting with the breech closed, the cutoff member 24 is held in its inoperative position, since the closure 27 has engaged the lug and rocked the cut-cti member against the action of its spring. The lug 25 is therefor retracted out of the path of a cartridge and the cartridge is permitted to move into engagement with the lug 21 of the cartridge release 19, the latter having been moved into its operative position by its spring 28, this movement being possible since the action rod is in its forward position whereby the arm 22 lies in the groove 17 of the action rod. The breech is then opened and the shell ejected from the gun. This is accomplished in the well-known manner by operating the breech bolt through the medium of the action rod. As the breech bolt moves rearwardly, the closure 27 is disengaged from the lug 30. The cut-ofi' member 24 does not immediately swing into operative position as the lug 25 is now engaged with the cartridge held by the lug 21. IVhen the breech bolt nears the rear end of the receiver, the shoulder 18 engages the arm 22 of the cartridge release 19 to rock the lug 21 out of the path of the cartridge. The cartridge then is advanced onto the carrier (not shown) and the lug 25 is disengaged therefrom, allowing the cut-off member 24 to be moved into operative position by its spring. The breech bolt now is returned to its forward position. The arm 22 rides down the shoulder 18 and the lug 21 is projected into cartridge engaging position. As the breech bolt approaches its closed position, the front edge of the closure 27 engages the lug 30 rocking the cut-off member 24: to disengage the lug 25 from the next cartridge to allow it to be fed against the lug 21.

The arrangement of the cut-oii on the side of the receiver opposite the release prevents the possibility of a cartridge being twisted into a jamming position by the magazine spring since it is first engaged at one point and then at a point diametrically opposite. Any tendency ot the cartridge to work out of alinement is thus overcome. As the cutoti' is maintained inoperative when the gun is breeched, the magazine may be emptied by merely actuating the release through the medium of a button in the usual manner. The

the gun insures that a cartridge is fed against the release in plenty of time and also is prevented from being fed against the release during the reloadino' of the gun. This is of importance when s ooting rapidly as it prevents the possibility of the gun developing a feed jam.

It is oi' course, understood that various modifications may be made in the structure without in any way departing from the spirit of the invention as set forth in the appended claims.

lVhat is claimed is:

1. In a firearm, a receiver having an ejection opening' in one side wall, a breech mechanism, an action rod for actuating said breech mechanism, a slide operable by said breech mechanism to close said opening when the firearm is breeched, a magazineV communicating with said receiver, a cut-oit member pivotally mounted on said side wall and adapted to project into said receiver, and means on said cut-ofi' member to be engaged by said slide to rock said member.

2. In a firearm, a receiver having side walls, a breech mechanism in said receiver, a cut-ofi member in one of said walls, a release member in the other wall, an action rod, means on said action rod for actuating one of said members, and a member movable with said breech mechanism for actuating said other member.

8. In a firearm, a receiver having an ejector opening in one wall, a breech bolt reciprocatively mounted in said receiver, an

action rod for actuating said breech mechanism, a slide attached to said breech bolt and adapted to close said aperture and a cut-ofi' member ivotally mounted on said wall and extending above the edge of said aperture to be engaged by said slide.

et. In a firearm, a receiver having an opening in one wall, a breech mechanism reciprocatively mounted in said receiver, an action rod for actuating said breech mechanism, a cut-olf member mounted on a pivot parallel to the path of reciprocation of said breech mechanism and having an arm projecting into said opening, a slide movable with said breech mechanism and adapted to close said opening, said slide having a tapered edge to contact with said arm to actuate said cutoii' member.

In witness whereof I hereunto sign my name this 18th day of March, 1922.

CARL GUSTAF SVVEBILIUS`

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