US1365592A - Dustproof device for firearms - Google Patents

Description

M. E. JOHNSTON. DUSIPROOF DEVICE FOR FIREARMS.

APPLICATION FHTED APR. II, I917.

1,365,592. @Pat'gnted. Jan. 11,1921.

, 5 w A giro 1 '5 11611 g I I 2' 7 'm. lilhdmmw m 6 INVENTOR. M LLTON E1 dUHN-STON BY mwm I] 7 r A TTORNEY.

' a citizen of the United-States, residing at Utica,in the'county of Oneida and Stateof 7 the .art to which it .appertains to make and UNITED STATES arsur QFEIQE.

MILTON E. JOHNSTON, OF UTICA, NEW YORK.

' DUSTPROOF DEVICE FOR FIREARMS.

Application filed April 11, 1917. Serial No. 161,302.

T 0 all'whom it may concern:

Be it known that I, MILTON E. J OHNSTON,

New York, have invented certain new and useful Improvements inDustproof Devices for Firearms, of which the following is. a specification, reference being had therein to the accompanying drawing.

My invention relates'to a dust proof device for firearms, and I declare the following to be a full, clear, concise, and exact description thereof sufiicient .to enable anyone skilled in use the same, reference being had to the accompanying drawings, in which like reference characters refer to like parts throughout the specification.

In the construction of most guns, themechanism isprovided with .a long narrow slot adapted for the actuation of the arm that reaches into the interior thereof for moving manually the breech loading mechanism.

This slot .leaves anopening for the entrance of sand and other particles of dust which accumulate on the mechanism and in the end impede the working of the parts of the gun.

The object of this invention is to produce a device that will close this opening and yet permit of the actuation of the arm that' moves the breech loading mechanism. The object will be understood by referring to the drawings in which:

Figure 1 is a side elevation of a fragment of a firearm, showingthe device attached thereto;

Fig. 2 is a perspective view of the casing employed;

' Fig. 3 is a side elevation of a part of a firearm, showing the device in section attached thereto; 7

Fig. 4 is an elevational view of a modified form of the device:

Fig. 5 is a perspective detail View of a block or member employed;

Fig. 6' is a perspective detail view of a handle employed.

Fig. 7 is a transverse section taken on the line 7- 7 of Fig.1.

Referring more particularly to the drawings, the invention is applied to a firearm or machine'gun such as illustrated in the application of James S. Johnston, filed April 3, 1917, numbered serially 159,533 and embodies a casing 1 having an upper lateral projecting member 2, that is formed in- Specification of Letterslatent. Patented J an, 11, 1921,

lower lateral projections 33, likewise formed. At either end of the casing 1, there is mounted a roller 4 upon a screw bolt 5. The inner end of thebolt 5.is threaded to be received into a correspondingly threaded aperture made in the side of the casing 6 of the firearm, whereby to hold the device in assembled position to said firearm.

A' metallic belt 7 is mounted to move over the rollers 4 and above the projecting member 2 and below the projections 3. The ends of the belt 7 are secured to the opposite edges of the block or memberv 8, which .has a cen tral aperture 9 for the reception of the end The handle 10 is bent, furthermore, at an angle, as at 15, to form a member adapted to :be projected through the aperture 9 of the block Stoengagecerta'in parts for pulling back, into cocked position, the breech bolt. Said handle 10 is bent also at 16 to make a hand grip.

In operation, the handle 10 is pulled to the rear to reload and cook the firearm. As the handle 10 is actuated to the rear, the same will be prevented from binding by the block 8 through which the end of said handle projects. The metallic belt 7 will move; also in unison with the block 8 to which it is attached to thereby cover the opening at the bottom of the casing 1, so as to prevent the admission of dust to the interior parts of the firearm.

Fig. 4 illustrates a modification embodying. a casing 20 which forms, when secured to'the side of the casing 6 of the gun, a chamber 21. The chamber 21 is open along the top portion for the disposition within said chamber-21 of a shutter 22 adapted to cover the longitudinal recess 23 formed in the gun, for the passage of the inner end of the handle 10. The leaf springs 2424: are made integral with the lower edge of the shutter 22 by cutting the narrow strips therein and bending the same down, as illustrated in Fig. 4. A tapering recess 25 is made in the shutter 22 for the disposition of the inner end of the handle 10, whereby the shutter 22 will lie normally opposite the longitudinal slot 23, in the casing 6 of the firearm. When the handle 10 is pulled back to reload and cock the gun, the same will depress the shutter 22 against the tension of the springs 24.- The depression will givea rocking motion to the shutter 22, so that part of the said shutter Will be available to close a part of the longitudinal slot 23 of the gun, at all times.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a firearm having a longitudinally movable breech bolt, the operating handle of which projects through and works in a slot in the frame, a casing mounted on said firearm adjacent said slot, and means mounted in said casing for preventing the admission of dust to the interior parts of the firearm. i

2. In a firearm having a longitudinally movable breech bolt, the operating handle of which projects through, and works in a slot in the frame, a casing having a lateral pro jecting member mounted on said firearm adjacent said slot, and means mounted in said casing for preventing the admission of dust to the interior parts of the firearm.'

3. In a firearm having a longitudinally movable breech bolt, the operating handle of which projects through, and works in a slot in the frame, a casing having alateral projecting member mounted on said firearm adjacent said slot, and movable means mounted in said casing for preventing the admission of dust to the interior parts of the firearm.

4. In a firearm havinga longitudinally movable breech bolt, the operating handle of which projects through, and works in a slot in the frame, a casing mounted on said firearm ad acent said slot, a belt mounted in said casing tor preventlng the admission of dust to the interior parts of the firearm,

erating handle.

6.111 a firearm having a longitudinally movable breech bolt, the operating handle of which projects through, and works in a slot in the frame, a casing mounted on said firearm adjacent said slot, rollers supported in said casing, and a belt adapted to travel over said rollers, whereby to prevent the admission of dust to the interior parts of the firearm.

In testimony whereof I have aflix'ed'my signature.

MILTON E. JOHNSTON.

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