Patent ID: 6109160
Filing Date: 2000-08-29
Classification: F41A

Abstract:
Breechblock device for automatic or semi-automatic weapons of the kind provided with a weapon case in to which a fixed barrel and a burst-box integral to the barrel are housed, comprising:a bottom piece able to close the opening of the burst-box;adjustable elastic means capable of opposing to an initial displacement of the bottom piece in respect of a starting position in which the bottom piece opens the burst-box at the moment of the firing, said elastic means comprising a plurality of arms extending parallely to the barrel and turning with an extremity on a suitable pin fixed to a portion of the burst-box, and sloping teeth built in to the arms by which the arms engage with a portion of the breechblock bottom piece which is movable in respect of the portion of the burst box;at least a spring hook connecting each arm to the adjacent ones at a predetermined axial position in order to exert an adjustable elastic reaction force opposing to said initial displacement and to the consequent opening of the arms due to the sloping teeth engagement;a return spring able to push the bottom piece from an end-stroke position back to a starting position where the bottom piece closes the burst box opening until the next firing.