초록 ▼

The present invention relates to a firearm, generally of the automatic or semi-automatic type, having a reciprocating breech block normally biased into closed position by a primary recoil absorption system including a spring, the improvement comprising providing a secondary spring-biased recoil abso

The present invention relates to a firearm, generally of the automatic or semi-automatic type, having a reciprocating breech block normally biased into closed position by a primary recoil absorption system including a spring, the improvement comprising providing a secondary spring-biased recoil absorption system cooperating with the primary one during a portion of the retraction stroke of the block to slow down the movement of the latter before becoming inactive while the primary system slows the block to a stop and reverses its direction and then becoming active to once again cooperate with the primary system during a portion of the return stroke of the block to speed up its return to its original position. The invention also encompasses the improved method for controlling the movement of the breech block in the aforementioned type of weapon during its firing cycle wherein such movement during its initial and final stages is supplemented and abetted by a secondary spring-biased recoil absorption system cooperating with the primary one while, at the same time, leaving the primary system solely responsible during the remainder of the cycle to stop the block and reverse its action.

대표청구항 ▼

In a firearm of the type having a frame and a receiver, a barrel mounted on the fame and having a shell-receiving chamber with a breech that is located adjacent to a rear end of the barrel, the shell-receiving chamber including a mouth on a front end thereof into which a shell is inserted for firing

In a firearm of the type having a frame and a receiver, a barrel mounted on the fame and having a shell-receiving chamber with a breech that is located adjacent to a rear end of the barrel, the shell-receiving chamber including a mouth on a front end thereof into which a shell is inserted for firing with shell firing imparting recoil energy into the breech and producing an empty shell casing, means for extracting the empty shell casing from the breech and means for positioning a new shell for insertion into the breech, a block having sidewalls and a front end and a rear end housing within the receiver for reciprocating movement along a path between a closed position with said front end seated against the breech and a retracted position uncovering the breech, with the empty shell casing being extracted from the breech as said block moves from said closed position to said retracted position and the new shell being inserted into the breech as said block moves from said retracted position to said closed position, and a primary recoil absorption means including a spring normally biasing the block into said closed position operative during a retraction stroke thereof to absorb at least a portion of recoil energy associated with firing of said shell while the empty shell casing is being extracted and during a return stroke to force said block into contact against the new shell to pick up that new shell and force same into the shellreceiving chamber, the improvement in combination therewith comprising: secondary recoil adsorption measn which immediately after firing is in movement-controlling connection with said block during a time the empty shell is being extracted and cooperates with the primary recoil absorption means to slow down the retraction stroke of the block as it moves away from the breech and then after the empty shell has been extracted becomes essentially inactive with respect to controlling movement of said block and then prior to the new shell being contacted by the breech block for insertion into the breech reengages into movement-controlling contact with said block and once again cooperates with said primary recoil absorption means and speeds up the return stroke of said block to a speed which is faster than that speed attainable under an influence of the primary recoil absorption means alone to assist the primary recoil absorption means during the picking up of the new shell and forcing it into the breech, said secondary recoil absorption means including at least a first lever-actuating means mounted on the frame adjacent to the block for movement towards an extended position when moving in a direction which is identical to that in which said block moves during the return stroke thereof and towards a retracted position when moving in a direction which is identical to that in which said block moves during said retraction stroke, a first spring means connected to the first lever-actuating means normally biasing same into said extending position, means comprising a first lever arm having an antifriction means mounted thereon, said first lever arm being connected to said first lever-actuating means and to the frame for pivotal movement between a substantially upright operative position in engagement with the rear end of the block yieldably resisting movement of the latter into said retracted position and a reclining inoperative position alongside a sidewall of said block, said first spring means cooperating with the first lever-actuating means and the first lever arm when said first lever arm is in said upright operative position in engagement with the rear end of said block to assist the primary recoil absorbing means in slowing down movement of said block as it moves away from the breech, said first lever arm and said first lever-actuating means and any recoil energy left in said block next cooperating with one another when said block is partially retracted to overcome bias exerted by said first spring means and move said first lever arm with said antifriction means out of contact with the rear end of said block and to move said first lever arm into said reclining inoperative position alongside said sidewall of the block such that any recoil energy remaining in the block when the first lever actuating means moves into said reclining inoperative position is absorbed solely by the primary recoil absorption means, said primary recoil absorption means being solely operative thereafter to terminate the retraction stroke of said block and start said block on said return stroke, and said first spring means finally cooperating with the first lever-actuating means and the first lever arm after said block has progressed part way along its return stroke under bias imparted thereto by the primary spring recoil absorption means to reactivate said secondary recoil absorption means by returning said first lever arm into said upright operative position and said antifriction means in contact with the rear end of said block thereby assisting said primary recoil absorption means to push and speed the block into said closed position against the breech