Ordnance – Automatic – Gas piston type
Patent
1983-10-04
1984-10-09
Bentley, Stephen C.
Ordnance
Automatic
Gas piston type
89185, 89199, F41D 1112
Patent
active
044754388
ABSTRACT:
A gas operated gun having a receiver (1) including a rear wall (100) at one end and a barrel (10) at the other end and a bolt carrier assembly (3) reciprocal within the receiver is arranged to co-operate with a main drive spring (307) that urges the bolt carrier assembly toward the barrel. The gun is designed so that in one aspect of the invention on an automatic cocking cycle the bolt overtravels the cartridge feed station by an amount equal to or greater than the overall length of a live cartridge.
In a further aspect, the gun is additionally designed using parameters calculated such that a substantially constant reaction is felt by a user. The parameters involved are essentially the product of sprung weight (the total weight in kg. of all components driven by the main spring).times.springing force (an average value of spring force that accelerates and retards the sprung weight).times.cycling distance (the length of allowable travel of the bolt carrier assembly in meters) is equal to (0.51).sup.2 .times.0.5 g.+-.15% where I is the cartridge impulse and g is the acceleration due to gravity. The length of allowable travel of the bolt carrier assembly is arranged such that the assembly does not impact a positive stop (100).
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Bentley Stephen C.
Chartered Industries of Singapore Private Ltd.
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