Ordnance – Automatic – Firing device operation or control
Patent
1981-08-06
1984-02-28
Bentley, Stephen C.
Ordnance
Automatic
Firing device operation or control
89149, F41D 1102
Patent
active
044336101
ABSTRACT:
An open bolt firing mechanism for an automatic firearm (10) has a reciprocating bolt assembly (20) with a sear abutment (32) which is engaged by a searing surface (46) on a hammer (36) during counter-recoil for terminating forward movement of the bolt assembly in a cocked position. An automatic sear (56) serves to pivot the hammer downwardly and produce disengagement of the sear abutment of the bolt assembly and the searing surface on the hammer which allows the bolt assembly to move into the battery position. A connector (76), which is pivotable in response to the pulling of a trigger (86), functions to displace the automatic sear for producing downward pivoting of the hammer. The automatic sear has a searing surface (54) which engages a sear abutment (52) on the hammer for retaining the hammer in a cocked position. A shoulder (106) on the bolt carrier (20a) of the bolt assembly is adapted to engage a leg (68) on the automatic sear as the bolt assembly moves into the battery position. The engagement between the shoulder and the automatic sear produces rotation of the automatic sear and disengagement between the sear abutment on the hammer and the searing surface on the automatic sear which allows the hammer to fall to a fired position where it strikes a firing pin (20c).
REFERENCES:
patent: 1786536 (1930-12-01), Holek
patent: 2383487 (1945-08-01), Johnson, Jr.
patent: 3618455 (1971-11-01), Plumer et al.
patent: 3960053 (1976-06-01), Conley
patent: 4057003 (1977-11-01), Atchisson
Bentley Stephen C.
Colt Industries Operating Corp
Dornon Richard A.
Luther Radford W.
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