In-line annular piston fixed bolt regenerative variable charge l

Details In-line annular piston fixed bolt regenerative variable charge l In-line annular piston fixed bolt regenerative variable charge l

1984-04-10

1986-05-06

Brown, David H.

Ordnance

Pneumatic

89 8, F41F 104

Patent

active

045864225

ABSTRACT:
A regenerative liquid propellant gun structure in which the differential area piston is annular, has an open peripheral cylindrical skirt extending away from the combustion chamber to define a propellant reservoir, and has an aperture in the piston head permitting overrunning of a fixed bolt. The fixed bolt is cylindrical with an enlarged band to fit the aperture to block flow of propellant until firing and to define with the edge of the aperture a variable annual orifice for propellant injection as the piston moves. There is a second free piston overrunning the bolt having a forward portion mating with both the inside of the differential area piston and the exterior of the cylindrical skirt so that the skirt constitutes a piston in a circular dashpot in the second piston. The second piston also contains a fluid accumulator, fluid conduit means interconnecting the accumulator and the dashpot and means for changing the cross sectional area of the fluid conduit means to provide a variable hydraulic resistance to the differential area piston during firing.

REFERENCES:
patent: 3138990 (1964-06-01), Jukes et al.
patent: 4023463 (1977-05-01), Tassie
patent: 4050349 (1977-09-01), Graham
patent: 4099445 (1978-07-01), Singelmann et al.
patent: 4100836 (1978-07-01), Hofmann
patent: 4269107 (1981-05-01), Campbell
patent: 4281582 (1981-08-01), Jagua
patent: 4341147 (1982-07-01), Mayer
patent: 4523507 (1985-06-01), Magoon
patent: 4523508 (1985-06-01), Mayer et al.

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