Delayed bolt action for firearm

Ordnance – Automatic – Breech block lock

Patent

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Details

F41D 1106

Patent

active

039981266

ABSTRACT:
A delayed blow back bolt action for a firearm includes a bolt and a slide which are movable together in the receiver frame and are disposed for limited movement with respect to one another. The bolt and slide have cooperating camming surfaces which cause a relatively large displacement of the slide in relation to the displacement of the bolt when the forces attendant to the discharge of a round in the firearm are initially applied to the bolt. The bolt is provided with a lug which engages a locking recess in the receiver frame of the firearm, and the lug and recess have cooperating camming surfaces, such that a surface of the recess provides an opposing force to the force generated by the discharge of a round from the firearm, which force is exerted against one end of the bolt. As such a force is supplied to the end of the bolt, the locking lug is forced out of the locking recess, thereby camming the slide in a direction which is along the longitudinal axis of the bolt. The delay caused by such camming action and movement of the slide is sufficient to permit the discharge of a round from the barrel of the firearm and substantial dissipation of the resulting gases. The moment of the moving bolt and slide, after the locking lug is removed from the locking recess, is sufficient to force the bolt and slide to a rearward position to open the breach, thereby cocking the hammer and permitting a second round of ammunition to be chambered.

REFERENCES:
patent: 2356726 (1944-08-01), Reising

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