F - Mech Eng,Light,Heat,Weapons – 41 – D
Patent
F - Mech Eng,Light,Heat,Weapons
41
D
89/17
F41D 3/00 (1980.01)
Patent
CA 1134657
ABSTRACT For an automatic cannon, a pneumatic bolt and sear buffer comprises a housing fixed rearwardly of a breech ring, a cylinder, an end plate and a low mass piston projecting forwardly through the cylinder. A pin trans- versely installed through the piston, into slots in the cylinder and housing, limits relative axial movement between the piston, cylinder and housing. A forward cylinder flange also limits rearward cylinder movement relative to the housing. Pressurization of gas in a pressure chamber defined by the cylinder, piston and end plate is through an end plate valve. A bolt sear is pivotally mounted to a sear bracket extension of the cylinder, forwardly of the piston. After firing, recoil impact of a reciprocating bolt assembly drives the piston rearwardly into the cylinder, and upon bolt searing the cylinder is pulled forwardly relative to the piston; in both cases the buffer gas is further compressed, acting as a massless spring. A sear support or keeper is pro- vided to prevent hitting and bouncing of the sear by the bolt assembly on searing up.
364044
Gillum Richard R.
Stoner Eugene M.
Ares Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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