US2128936A - Muzzle attachment for guns - Google Patents

Description

Sept. 6, 1938. s. e. GREEN I MUZZLE ATTACHMENT FOR GUNS Filed Oct. 16, 1936 Inventor Samuel [3-Breen @MKMZ Attcsr'ne Patented Sept. 6, 1938 UNITED STATES PATENT OFFICE 4 Claims.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manu factured and used by or for the Government for governmental purposes, without .thelpayment to me of any royalty thereon.

This invention relates to a. muzzle attachment for guns and more particularly it has refe ence to that class of attachment serving to check recoil, silence the report, eliminate smoke, and reduce flash.

The principal object of this invention is to provide a gas-receiving casing having an efficient arrangement for cooling the gases prior to their discharge into the atmosphere.

A further object is to associate the gas-receiving casing with a water jacket which may conveniently be in fluid communication with the main water jacket of the gun.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claims forming a part of this specification.

A practical embodiment of the invention is H- lustrated in the accompanying drawing, wherein: i

Fig. 1 is a longitudinal sectional view of the improved device applied to a water-cooled machine gun.

Fig. 2 is a sectional view on the lines 2--2 of Fig. 1.

Fig. 3 is a view in front elevation with part in section on the line 3-3 of Fig. l.

Referring to the drawing by characters of reference there is shown the front portion of a machine gun comprising a Jacket 5 adapted to contain a cooling fluid such as water. The front plate 6 of the jacket is apertured to receive bushings in which the muzzle of a gun barrel 8 is slidably supported. The front plate is also provided adjacent its periphery with a plurality of apertures 9 which establish fluid communication with an attachment that is mounted on-a tubular extension In of the front plate.

The attachment comprises an adapter threadedly secured on the extension I and having a plurality of apertures ill in line with and preferably larger than the apertures 9. Gaskets l3, II and I are placed between the adioining faces of the adapter and front plate and the joint is encircled by a clamping band l6 having a lining IT.

The adapter carries an inner gas-receiving casing 18 and an outer casing I9 which is spaced from the inner casing to provide an annular chamber 20 for containing water admitted through the apertures 9 and I2.

The inner casing l8 comprises a large tubular rear part 2| forming an expansion chamber 22 and a reduced tubular front part 23 through which the bullet fromthe gun barrel travels. The front part 23 has an enlarged central portion with oppositely tapering walls 24 to establish an expansion and contraction chamber 25 for the gases which follow the bullet.

A series of spaced flues 26 are provided on the outer side of the front part and are arranged longitudinally thereof. The flues are conveniently provided by forming the inner casing with spaced radial fins 21 and then attaching covers 28, as by welding, toclose in alternate spaces between the flns. These covers extend beyond the rear ends of the fins and are fitted on the large rear part 2| to which they are secured by welding. The alternate spaces 29 between the flues are open to the annular chamber 20 so that the cooling fluid surrounds three sides of the flues.

Each flue has a gas inlet 30 from the expansion chamber 22 and this inlet is preferably provided at the forward end of the rear part 2| so that the gases throttled therethrough are directed radially and strike the cover 28 which serves as a baflie. The front end of each flue is open to atmosphere and constitutes an outlet 3|.

The outer casing l9 has a turned-in front end 32 which meets and is welded to the covers 28 of the flues and to a plate 33 which is secured on the front part 23 of the inner casing l8 and closes the spaces 29, being welded to the fins.

.The annular chamber 20 is divided into a plurality of compartments by partitions 34 which terminate short of the front end of the chamber so that all of the compartments are in communication and the water will be freely circulated.

The gases issuing from the gun barrel expand in the chamber where their temperature and velocity are reduced. A portion of the gases are vented through the flues and the remainder follow the bullet and are vented through the reduced part 23 of the casing.

1. In a gun, a jacket for a cooling fluid and having apertures in its front end, a gun barrel in the jacket and extending through the front end thereof, a unit mounted on the front end of the jacket and including an inner casing for receiving the gases of discharge from the barrel, said casing having an enlarged rear part and a reduced front part, spaced flues extending longitudinally a d formed in part by the outer side of the reduced front'part of theinner casing and having communication with the rearpart of the casing, an outer casing surrounding the inner casing and flues and spaced therefrom to establish a chamber therewith, said chamber open to the apertures in the front end of the fluid jacket whereby cooling fluid surrounds and contacts both the inner casing and the flues.

2 In a gun, a jacket for a cooling fluid, a gun barrel extending through the front end of the jacket, a unit mounted on the front end of the jacket and including an inner casing for receiving the gases of discharge from the barrel, spaced flues formed in part by the outer side of said casing, each flue having an inlet at its rear end and a gas outlet at its front end, an outer casing surrounding the inner casing and flues and spaced therefrom to establish a chamber therewith, said chamber having fluid communication with the Jacket whereby cooling fluid surrounds and contacts both the inner casing and the flues.

3. A muzzle attachment for a gun comprising an inner casing for receiving the gases of dis-\ charge of the gun, spaced flues fixed on the outer 'side of said casing, each flue having a gas inlet and a gas outlet, and ajacket surrounding the inner casing and the flues, the interior wall of the jacket and the exterior walls of the inner casing and flues cooperating to provide a chamber for a cooling fluid which surrounds and contacts both the inner casing and flues.

4. A muzzle attachment for a gun comprising a casing for receiving the gases of discharge of the gun and having a rear part and a front part, the rear part providing an expansion chamber, and a plurality of exhaust conduits formed integrally on the outer side of the front part of the casing and leading from the expansion chamber to atmosphere.

SAMUEL G. GREEN.

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