Title:
Ammunition feed box
United States Patent 2401762


Abstract:
The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon. This invention relates to an ammunition feedbox for machine guns, and particularly to a feedbox having means for rapidly advancing...



Inventors:
Irasek, Eugene H.
Application Number:
US49235543A
Publication Date:
06/11/1946
Filing Date:
06/26/1943
Assignee:
Irasek, Eugene H.
Primary Class:
International Classes:
F41A9/79
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Description:

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to an ammunition feedbox for machine guns, and particularly to a feedbox having means for rapidly advancing the initial or forward end of the cartridge belt into the gun where it can be engaged by the gun mechanism, without raising the gun cover.

One object of the invention is to provide an ammunition magazine having a slide on the cover of the magazine box for rapidly and easily advancing the first cartridge of the belt into the gun, and means for locking the slide in its advanced and retracted positions.

Another object of the invention is the provision of a magazine feed pawl attached to the forward end of the slide to prevent the belt of cartridges from moving into or out of the box when the slide is locked in its retracted position, and to prevent the belt from falling back into the box when the slide is in its advanced position, the pawl engaging the cartridges to move them into the gun when the slide is moved from its retracted position to its advanced position.

A further object of the invention is to provide an ammunition feedbox which is inexpensive, light in weight, and adapted to be manufactured in large quantities.

These and further objects of my invention will be better understood by reference to the accompanying drawings, in which Fig. 1 is a perspective view of the improved ammunition feedbox showing the slide in its retracted position; Fig. 2 is a vertical section taken on line 4-4 of Fig. 4; Fig. 3 is a vertical section taken on line 3-3 of Fig. 4; Fig. 4 is a plan view of the box showing the slide in its retracted position in solid lines, and in its advanced position in chain lines; and Fig. 5 is a side view of the upper portion of the box with part of the upper side wall broken away to show the position of the pawl as a cartridge passes beneath it when the slide is in its advanced position.

Referring to the drawings, the box 10 is provided with a cover II hinged to the box at 12. A latch 13 is provided for holding the cover in its closed position. In the end of the cover adjacent the gun is a cut-out portion 14. On each side of the cut-out portion, a metal strip 15 is attached to the cover so as to form a slot 16, as shown in Figs. 1 ard 3. Mounted on the cover aid riding in the slots 16 is a slide 17 formed with berit-out portions 18 which fit into the slots.

Attached to the bottom wall of the slide is a base piece 19 which also extends into the slots. In order to preveint the slide from moving beyond the desired advanced and retracted positions, a cut-out portion 20 is provided in the out-turned edge portions of the slide which extend into the slots. Suitable detents such as screws 21 extend through the metal strips forming the slot and into the cover so as to lie in the cut-out portions 20, best showhn in Fig. 4.

A slide handle 22 is attached to the rear end of the slide by means of a hinge rod 23 which is keyed to the handle as shown in Fig. 1. The rod' 23 is formied with a flat side 24 in its central portion to exert a cam action on the upturned rear portiori of a resilient member 25 when the handle 22 is raised. The resilient member 25 is attached at its forward end to the base portion of the slide and carries a downwardly extending detent 2& which is adapted to project into holes 27 and 28 in the cover of the box to lock the slide in its retracted and advanced positions.

Attached to the forward end of the slide 17 is a pawl 29 which extends downwardly into the cartridge exit. The pawl is hinged to the slide at 301 and is urged downwardly by a spring 31 to thei position shown in Fig. 2. Slots 32 in each end of the pawl are so positioned that the edges of the cutaway portions 14 of the cover extend into themi when the slide is in its retracted position, as shown in Figs. 1 and 4, thus preventing Srotation of the pawl. When the slide is in its advanced position, as shown in Fig. 5 ard by the chain lines in Fig. 4, the pawl 29 lies outside the cut-out portion 14 of the cover and is therefore free to be moved upwardly against the pressure of spring 31' to permiit passage of the cartridges outwardly through the cartridge exit as the gun is fired. In neither the advanced nor the retracted position of the slide can the pawl be turned downwardly past the position shown in Fig. 2 due to the fact that its upper portion 38 bears against the upper part of the slide 17. Thus, when the slide is in its advanced position, the pawl 29 can move upwardly to permit passage of the cartridges out of the box but is held against downward movement, thus preventing the cartridges from falling back into the box. In Fig. 5, the pawl is shown in its raised position as a cartridge passes between the pawl and the shelf 17T.

5 For the purpose of increased rigidity, the cover is formed with bent-under edge portions 34 and 35, as is the box at 33. Transverse ridges 36 in the cover also add strength to that part.

The shelf 37 defines the lower wall of the cartridge exit, the shelf being so positioned as to extend into the feedway of the gun when the ammunition box is mounted on the gun. Bentover end portions 39 of the shelf serve as additional guides for the cartridges. The inner portion of the shelf 37 is bent downwardly at 40 to form a curved cartridge guide.

In operation, the box is placed in an ammunition box adaptor which is mounted adjacent the gun for movement with the gun. This adaptor is in the form of a box open at the top. When the ammunition box is positioned in the adaptor, the shelf 37 extends into the feedway of the gun so as to provide a continuous cartridge passage connecting the cartridge exit of the ammunition box with the gun feedway. When a fresh box of ammunition is taken from stowage, the slide is locked in its retracted position. To feed the first cartridges into the gun, the slide handle 22 is raised as by striking with the heel of the hand.

This rotates the hinge rod 23 which, by the cam action of its flat portion 24, raises the rear end of the resilient member 25, thus lifting the detent dog 26 clear of the hole 27 in the cover of the box. The slide is then free to move to its forward position by continued pressure on the handle 22. When the slide reaches its advanced position, its movement is halted by the rear end of the cut-out portion 20 of the slide contacting detents 21. Pressure on the handle is then released and the handle is moved to its horizontal or lower position, as shown in Pig. 5, thus allowing the resilient member 25 to lower the detent 26 into hole 28 in the cover of the box to lock the slide in its advanced position. Movement of the slide to its forward position moves the first cartridge of the belt into the feedway of the gun where it is engaged by the feed mechanism of the gun. Thereafter, the gun is charged twice and is then ready for firing.

It is.an important feature of my invention that when the slide is locked in its retracted position, the pawl 29 is locked in its downward position due to the fact that the slots 32 in the pawl engage the edges of the cut-away portion 14 of the box cover, as shown in Figs. 1 and 4. Since the lower part of the pawl is positioned between adjacent cartridges in the belt when in the retracted position, the cartridges are positively held against motion either into or out of the box.

This assures that the fresh box of ammunition will always be ready for immediate use with the cartridges in their correct position for rapid feeding into the gun. When the slide is in its advanced position, the slots on the pawl are disengaged from the edges of the cut-out portion 14 of the cover with the result that the pawl is free to move upwardly against the pressure of spring 31 to permit the passage of cartridges beneath it out of the feedbox, as shown in Fig. 5.

When loading the magazine, the slide on the cover is pulled all the way back until detent 21 contacts the forward end of the cut-out portion 20 of the slide, at which position the slide detent engages the hole 27 in the cover. It is important for the slots in the pawl 29 to engage the edges of the cut-out portion 14 of the cover, as previously explained, in order to prevent the cartridges from falling into or out of the magazine during stowage. With the magazine feed pawl 29 in this position, there should be three cartridges and no extra link in the cartridge exit of the magazine beyond the magazine feed pawl when the cover is -latched in position.

With the feedbox positioned and the slide advanced, the cover of the gun may be raised for the purpose of gaining access to the bolt to clear stoppages without fear of disarranging the belt or the end cartridges because the pawl will hold the belt in the feedway of the gun and will not permit the belt to fall back into the box. I claim: 1. In a feedbox for belted ammunition, means for controlling movement of said ammunition, comprising a cover on said box, a slide mounted on said cover and selectively movable to adso vanced and retracted positions, a feed pawl hinged to said slide and operably engageable with said ammunition to control movement thereof, and interengageable locking portions on said pawl and said cover, said portions arranged to be engaged when the.slide is in its retracted position, and constructed to prevent pivotal movement of the pawl from its ammunition engaging position and thereby lock said ammunition against movement, and said locking portions arranged to be disengaged to thereby release said ammunition for movement out of the box when said slide is in its advanced position.

2. An ammunition feedbox comprising a container having a cartridge exit, a cover hinged to the container and having a cut-out portion on its forward edge, a slide mounted on said cover and having advanced and retracted positions, a handle hinged to said slide, means actuated by said handle for locking and unlocking said slide in its advanced and retracted positions,-and a pawl hinged to said slide and extending downwardly into the cut-out portion of. the forward edge of the cover, said pawl having a slot formed in each of its ends, said slots engaging the inner edges of the cutaway portion of the cover when-the slide is in its retracted position to hold the pawl in its down position, said pawl having an upper portion which bears against the top of the slide to limit downward movement of the pawl.' EUGENE H. IRASEK.

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