초록 ▼

This invention relates to a firearm and more particularly to a firearm having a bolt action in which a bolt is arranged for axial and rotational movement in a receiver and an extractor system operable in combination with the movement of the bolt relative to the bolt receiver. The bolt includes lugs

This invention relates to a firearm and more particularly to a firearm having a bolt action in which a bolt is arranged for axial and rotational movement in a receiver and an extractor system operable in combination with the movement of the bolt relative to the bolt receiver. The bolt includes lugs having a locking surface which engages a locking wall formed on a cooperating lug on the receiver when the bolt is in the firing position. Both the locking surface and locking wall are arranged at cooperating angles and are conically shaped so as to insure that the axis of the bolt and receiver will be concentric when the bolt is locked in the firing position. In the event of a cartridge rupture the angle of the locking wall causes some of the forces generated by the rupture to be diverted at an angle from the axis, thereby minimizing the shearing stresses on the receiver lugs. The extractor includes a portion arranged as part of the bolt locking surface so that the extractor is mechanically held relative to the bolt when the bolt is in the firing position.

대표청구항 ▼

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising: a receiver having an axis and including a cartridge firing chamber having a cylindrical interior wall; a bolt having an axis and longitudinally slidable in and rotatably arranged in said receiver movable between a

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising: a receiver having an axis and including a cartridge firing chamber having a cylindrical interior wall; a bolt having an axis and longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a firing position, said bolt having a cylindrical body portion including a front portion having an elongated cross-section and a rear end; locking means formed on said interior wall defining a mortise opening dimensioned for allowing passage of said front portion of said bolt into said cartridge firing chamber during movement of said bolt to said cartridge firing chamber, and having a forward end and for allowing rotational movement of said bolt in said mortise opening when said front portion is in said cartridge firing chamber; and cooperating locking surfaces on the rear end of said front portion of said bolt and the forward end of said locking means conical in shape for concentrically holding said bolt relative to said receiver, and said forward end of said locking means being an angle sufficient to divert forces caused when said cartridge is fired in said chamber.