Ordnance – Automatic – Buffers and brakes
Patent
1979-03-27
1981-08-11
Bentley, Stephen C.
Ordnance
Automatic
Buffers and brakes
F41D 1112
Patent
active
042827965
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 transversely 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 provided to prevent hitting and bouncing of the sear by the searing up.
REFERENCES:
patent: 2108026 (1938-02-01), Sutter et al.
patent: 2496323 (1950-02-01), Waltke
patent: 3566744 (1971-03-01), Stoner
patent: 3757636 (1973-09-01), Chiabrandy
Gillum Richard R.
Stoner Eugene M.
ARES, Inc.
Bentley Stephen C.
Fowler Allan R.
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