Ordnance – Recoilless gun – Having a reaction mass
Patent
1977-11-03
1979-04-10
Brown, David H.
Ordnance
Recoilless gun
Having a reaction mass
188 1C, F41F 302
Patent
active
041482441
ABSTRACT:
An apparatus for braking a free piston which is driven at a high acceleran within a tube and, particularly, in a recoilless firearm, comprises a tube which has a first portion of a first diameter and a second portion of a second diameter greater than the first portion with a transition portion therebetween. A free piston is freely movable in the first portion and it has substantially the same diameter as the first portion. A braking sleeve is secured to the interior wall of the tube in the second portion thereof and it has an edge facing the piston which is beveled inwardly to a knife edge. A deformation ring is carried in the second portion between the braking sleeve and the piston and the piston carries an expanding member which moves outwardly when the piston is moved from the first portion through the transition portion to the second portion to contact the deformation ring and to force it against the edge of the braking sleeve so as to deform the braking sleeve starting from its edge which faces the piston radially inwardly to effect the braking of the piston. In one embodiment, the expanding member comprises a ring carried on the piston which rides in a groove of the piston and which is urged outwardly by gases which propel the piston and which communicate with the groove to a passage defined in the rear face of the piston. In another embodiment, the expanding member includes a ring carried on the opposite end of the piston from the end exposed to the propelling gases with a sleeve having a plurality of longitudinal slits which permit the sleeve to be deflected downwardly by the first portion of the tube in which the piston is movable, but which may move outwardly when the piston moves through the transition zone to the second portion so as to contact a deformation ring which is urged by the expanding member to deform the braking sleeve.
REFERENCES:
patent: 3234727 (1966-02-01), Filer
patent: 3450233 (1969-06-01), Massa
patent: 3762279 (1973-10-01), Zeyher
patent: 3771417 (1973-11-01), Schnabele et al.
patent: 3779130 (1973-12-01), Schnabele
patent: 3779591 (1973-12-01), Rands
patent: 3915486 (1975-10-01), Maeda et al.
Schnabele Werner
VON Malottki Paul
Brown David H.
Messerschmitt-Bolkow-Blohm Gesellschaft mit beschrankter Haftung
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