Breech mechanism for a firearm, especially a repeater weapon

Details Breech mechanism for a firearm, especially a repeater weapon Breech mechanism for a firearm, especially a repeater weapon

1994-02-23

1995-10-17

Johnson, Stephen M.

Ordnance

Automatic

Breech block lock

42 16, F41A 342

Patent

active

054580463

ABSTRACT:
In the breech mechanism for a firearm the receiver (2) attached to the barrel has a radially inwardly directed conical locking shoulder (16). A breech head (9) and a locking sleeve (7) are arranged in a slider (3) slidable relative to the breech housing (1) in the barrel direction. The locking sleeve (7) is divided into a plurality of spring tongues (7b), each of which carries a locking element (13) with radially inwardly and outwardly directed cone sections. A spreading cone is arranged in the vicinity of the front end (9a) of the breech head (9) and cooperates with the locking elements (13). An actuating lever (18) is arranged on the slider, connected to a pivot shaft (17). The pivot shaft (17) is connected to a locking lever (19). A two-armed intermediate lever (20) is pivotally mounted on the slider (3) behind the locking lever (19), pivoting about an axis (20a) parallel to the pivot shaft (17) and cooperating with an abutment (22) arranged on the breech housing (1). The free end (19a) of the locking lever (19) so cooperates with the first lever arm (21) of the intermediate lever (20) that, on sliding the slider forwards, the first lever arm (21) comes into position between the abutment (22) and the free end (19a) and the free end (19a) can move over a dead center position defined by the connecting line between the point of engagement of the first lever arm (21) with the abutment (22) and the center of the pivot shaft (17).

REFERENCES:
patent: 1057329 (1913-03-01), Clarus
patent: 2370189 (1945-02-01), Penney
patent: 2861374 (1958-11-01), Hampton
patent: 4135434 (1979-01-01), Hurlemann et al.
patent: 5259137 (1993-11-01), Blenk et al.

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