US3078800A

US3078800A - Munitions

Info

Publication number: US3078800A
Application number: US16254A
Authority: US
Inventors: Bumiller Jacques
Original assignee: Societe de Prospection et dInventions Techniques SPIT SAS
Current assignee: Societe de Prospection et dInventions Techniques SPIT SAS
Priority date: 1959-09-02
Filing date: 1960-03-21
Publication date: 1963-02-26
Anticipated expiration: 1980-02-26

Description

J. BUMILLER Feb. 26, 1963 MUNITIONS Filed March 21, 1960 lnvnfor JACQUES BUM/LLER B Wm WM.

Afforneys 3,078,800 MUNITIONS Jacques Bumiller, Valence, France, assignor to Societe de Prospection et dlnventions Techniques Spit, Bourgles-Valence, France Filed Mar. 21, 1960, Ser. No. 16,254 Claims priority, application France Sept. 2, 1959 1 Claim. (Cl. 102-38) The present invention relates to munitions and more particularly to those for use in power actuated tools or guns which drive, under the effect of an explosive charge contained in a cartridge, a metal pin or the like into hard compact materials.

There have already been proposed munitions, in particular for said kind of gun, which comprise a cartridge whose case is of plastic material or has a uniform and not very thick covering of plastic material.

The object of the invention is to obtain a perfect sealing or fluid-tightness between the munition and the loading chamber and an easy ejection (automatic or otherwise) of the cartridge case after firing, in particular in guns in which the loading chamber is formed in a barrel carrier relative to which the barrel is capable of undergoing a slight rearward movement.

To this end, the loading chamber is slightly tapered and the munition according to the invention is characterised in that it comprises the usual cartridge case (adapted to contain at least the powder charge and the primer composition) and a throw-away cartridge carrier on the axis of which said case is disposed, said cartridge carrier, which is advantageously of plastic material, having a tapered outer shape which fits that of the loading chamber, the forward end of the cartridge case being adjacent the smaller end of the taper.

If the munition is pushed in to the end of the loading chamber of the gun, there is obtained a perfect sealing or fluid-tightness, owing to the tapered shape and plasticity of the cartridge carrier. The ejection of the latter out of the loading chamber (for example by a slight rearward movement of the barrel relative to the barrel carrier) is effected very easily, again owing to the tapered shape.

According to another feature of the invention, the housing or cavity provided in the tapered cartridge carrier for the cartridge case comprises at least an expansion chamber arranged to be situated on the periphery of the cartridge case.

In a preferred embodiment of the munition of the invention, the munition has the following features and combinations thereof:

The expansion chamber is annular and arranged to surround the cartridge case;

The expansion chamber extends along a part of the length of the cartridge case;

Patented Feb. 26, 1963 The expansion chamber opens on to the forward face of the cartridge carrier.

The accompanying drawing shows diagrammatically, on a large scale, a longitudinal sectional view of an embodiment of a cartridge carrier with its cartridge.

In this embodiment, the cartridge case 1, which has substantially a cylindrical shape, is engaged in the cartridge carrier 2 of for example plastic material.

The cartridge carrier, having the form of an annular body open at its two ends, has, towards it front end 2b, a tapered or conical outer face 2a for use with a gun whose loading chamber is tapered or conical.

Further, the cartridge case 1 is only held at its flanged rear part 1a in the cartridge carrier in which it is a force fit and an annular expansion chamber 3 is formed in the cartridge carrier around the cartridge case 1, this expansion chamber being open at its forward end 4, that is to say towards the front end 2b of the cartridge carrier.

With such an expansion chamber, the cartridge case is free to expand slightly at the moment of firing so as to fill said expansion chamber, which reduces the violence of the explosion.

It must be understood that the embodiment of the munition described herein before and shown in the accompanying drawing, has been given merely by way of a non-limitative example and any modification of its details can be made as do not depart from the scope of the invention as defined in the appended claim.

What I claim is:

In the combination comprising a cartridge casing of substantially cylindrical shape with a rim portion on one end thereof, a cartridge carrier surrounding said cartridge casing, said cartridge carrier having the form of an annular body being open at both ends and tapered toward the end of the casing opposite said rim portion, said cartridge carrier being of plastic and having an aperture extending throughout the length thereof, said aperture at one end of said carrier being of a diameter equal to that of said cartridge casing, the diameter of the remainder of said aperture being substantially greater than the diameter of said cartridge casing, the surface of the larger diameter aperture being substantially greater than the surface of the portion of the aperture the diameter of which is equal to that of the cartridge casing.

References Cited in the file of this patent UNITED STATES PATENTS 1,517,702 B'rubaker Dec. 2, 1924 2,862,446 Ringdal Dec. 2, 1958 2,898,694 Senutovitch Aug. 11, 1959 FOREIGN PATENTS 469,800 France May 29, 19 14