초록 ▼

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 sleev

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).

대표청구항 ▼

In a breech mechanism for a firearm having a barrel, a breech housing, a hollow receiver and a substantially cylindrical breech head, said barrel, breech housing, receiver and breech head each having a front end and a rear end, the front end of said receiver being attached to a rear end of the barre

In a breech mechanism for a firearm having a barrel, a breech housing, a hollow receiver and a substantially cylindrical breech head, said barrel, breech housing, receiver and breech head each having a front end and a rear end, the front end of said receiver being attached to a rear end of the barrel which said barrel extends forwardly toward said front end thereof and said receiver further being attached to the breech housing which said breech housing extends rearwardly toward the rear end thereof, said receiver having a radially inwardly directed, conical locking shoulder formed about an interior surface thereof, the substantially cylindrical breech head having a spreading cone formed about an outer peripheral surface of said breech head proximate said front end, said breech head being slidable relative to the breech housing along a first path in a direction of a longitudinal barrel axis of the barrel and between a locked position with said front end disposed within said receiver and an unlocked position away from said receiver, said breech mechanism further including a locking sleeve which concentrically surrounds the breech head and includes a front end, a rear end and a plurality of radially movable locking elements formed as annular parts proximate the front end of said locking sleeve which locking elements have radially outwardly directed cone sections and radially inwardly directed cone sections that are arranged proximate the front end of the breech head, each of said radially outwardly directed cone sections being adapted to bear on the locking shoulder of the receiver when said breech housing is in the locked position and each of said radially inwardly directed cone sections adapted to bear on said spreading cone, the locking sleeve being slidable axially relative to the breech head along a second path having a limited length relative to said first path, which locking sleeve cooperates with an actuating device for sliding the locking sleeve forward axially relative to the breech head along said second path, with the breech mechanism closed, comprising the improvement wherein: a) the locking sleeve is divided at the front end thereof by a plurality of longitudinal slots into a plurality of spring tongues, each said spring tongue terminating at a free, front end which defines the front end of the locking sleeve and including at least one said locking element formed integral therewith at the free, front end of the spring tongue, b) the radially inwardly directed cone sections are provided on front ends of the locking elements, c) said breech mechanism includes a hollow slider within said breech housing which is slidable relative to the breech housing wherein the breech head and the locking sleeve are arranged in said slider and the locking sleeve is fixedly connected to the slider so that said breech head is slidable along said first path by movement of said slider, d) said actuating device comprises an actuating lever connected to a first pivot shaft which is arranged transverse to the longitudinal barrel axis and is mounted on the slider, e) the first pivot shaft is connected to a locking lever which has a free end projecting away from said pivot shaft, f) a two-armed intermediate lever connected to a second pivot shaft is arranged on the slider rearwardly from the locking lever and has first and second lever arms, said intermediate lever pivotable about an axis of said second pivot shaft parallel to the first pivot shaft and cooperating through said first lever arm with an abutment arranged on the breech housing, and g) the free end of the locking lever cooperates with the first lever arm of the intermediate lever so that, when the slider slides forward, the first lever arm comes into a position between the abutment and the free end of the locking lever, and the free end can move beyond a dead center position defined by a connecting line extending between a point of engagement of the first lever arm with the abutment and a center of the first pivot shaft.