Ordnance – Automatic – Blow back breech block
Patent
1987-12-14
1990-01-23
Tudor, Harold J.
Ordnance
Automatic
Blow back breech block
42 25, 89151, F01B 1500
Patent
active
048950645
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improved machine-pistol for cartridges of different types.
It is known that a portable weapon of the type defined as a "machine-pistol" is usually designed and manufactured on the basis of the characteristics of one and only one, existing type of standard cartridge.
The consequence of such a usual design is that the use of the machine piston is tied to the use of only that cartridge type the pistol was manufactured for.
The design efforts carried out to date in the field of machine guns have led to accomplishments all directed to the principle of minimizing weight and overall dimensions. However, such guns are usuable only with nine-gauge Parabellum cartridges with cases.
This type of cartridge allows, the use of an extremely simple weapon, thanks to the adoption of the known system of mass shutting.
However, caseless cartridges also exist, which, as compared to the cartridges of traditional Parabellum type including cases, have the following basic advantages: caseless cartridges are lighter (about 60%) and hence, with their weight being the same, the number of cartridges in an individual supply can be increased by about 67%; caseless cartridges also have an exit speed higher by about 20% than that of the traditional cartridges, and thus they hit the target with a greater penetration energy at the shooting distance; and caseless cartridges eliminate the bothersome need of recovering the cases at the end of shooting. Also by being formed of one piece only, caseless cartridges are simpler, cheaper, and allow shooting to be carried out in the absolute absence of typical drawbacks caused by the ejection of the cases. Hence, caseless cartridges can be used in full safety on board of any civil or military (terrestrial, maritime, air) transport means, and without damages, malfunctionings or the immobilization being caused to the transport means, in particular to aircraft, wherein it is a matter of flight safety. Finally, caseless cartridges also allow no traces to be left in the postings the shooting was carried out in.
For caseless cartridges, to date no machine pistols have been developed which are endowed with the characteristics of simpleness and of minimum weight and overall dimensions which are typical of the machine pistol for the above mentioned nine-gauge Parabellum cartridge.
SUMMARY OF THE INVENTION
The purpose of the present invention is thus to provide a machine pistol which is easily convertible for the optional use of different cartridge types, i.e., cartridges with cases and caseless cartridges, while maintaining characteristics of structural simpleness and of minimum weight and overall dimensions.
The invention furthermore provides a machine-pistol convertible for the use both of axial-percussion and radialpercussion cartridges, and piezoelectric-priming cartridges.
In view of these purposes, according to the invention, an improved machine-pistol for different types of cartridges is proposed, which comprises a barrel provided with a cartridge chamber for housing a cartridge in its firing position, a magazine for feeding the cartridges, a percussion device for priming the firing, and breech block movable relative to the barrel for actuation of the percussion device. The breech block is provided with a longitudinal portion defining an at least semicylindrical chamber, surrounding, for a certain longitudinal length, the barrel, with a small radial clearance, in a forward position for the actuation of the percussion device.
Advantageously, such a configuration of the breech block and of the barrel allows use of axial percussion or radial percussion, as well as the piezoelectric priming, in as much as the percussion device can be positioned in such a way that it can be optionally actuated by an axial portion of the breech block of the breech block which is or by a portion able to surround, radially from the outside, the barrel. In other terms, the breech block and the barrel of a pistol according to the invention, even if they always
REFERENCES:
patent: 3195408 (1965-07-01), Sherman
patent: 3882625 (1975-05-01), Tellie
patent: 3967141 (1976-06-01), Gawlick et al.
patent: 4035943 (1977-07-01), Civolani et al.
SO.C.I.MI.Societa' Construzioni Industriali Milano S.p.A.
Tudor Harold J.
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