F - Mech Eng,Light,Heat,Weapons – 41 – A
Patent
F - Mech Eng,Light,Heat,Weapons
41
A
89/19
F41A 3/26 (2006.01)
Patent
CA 1224952
ABSTRACT In a bolt assembly for inertial operating automatic fire- arms using the kinetic recoil energy, of the type comprising a locking bolt head and a floating bolt element with a spring interposed between them, the locking bolt head is a rotatable head having a cylindrical portion (1) and a shank (2) narrowed with respect to the cylindrical portion. The cylindrical portion (1) has two radial crescent shaped diametrically opposite pro- jections (6), (7) adapted to engage each an associated groove (12), (13) provided in the barrel (9) and to disengage therefrom by passing through two associated recesses (10), (11) having a shape corresponding to that of the two crescent shaped projections (6), (7) of the head. The shank (2) of the locking bolt head is received in a cylindrical bore (21) of the floating bolt element (19) and engages by means of a pin (5) projecting therefrom a helical slot (20) of the floating bolt element (19). Interposed between the shank (2) of the rotatable locking bolt head and the floating bolt element (19) is a spring (30). When the arm is locked the projections (6), (7) of the cylindrical portion (l) of the locking bolt head are in the associated grooves (12), (13) of the barrel (9). At firing, at the beginning the floating bolt element (19), because of its reaction to the recoil of the arm, advances and compresses the spring. Immediately after the spring (30) spreads out and causes the floating bolt element (19) to move back which unlocks the rotatable locking bolt head and causes the pin (5) to slide in the helical slot (20) thus disengaging the rotatable locking bolt head from the barrel (9) and causing the projections (6), (7) of the cylindrical portion (l) of the head to pass through the two recesses (10), (11) of the barrel (9). The arm is thus open and reloads itself automatically in a conventional manner.
452358
Benelli Armi S.p.a.
Meredith & Finlayson
LandOfFree
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