Patent ID: 7269918

Claim:
A pump gun comprising: a barrel with a cartridge chamber; a cartridge magazine tube arranged under and parallel to the barrel; a carrier receiving a cartridge from the magazine tube, said carrier transferring the cartridge to the barrel cartridge chamber; a breech block moving between a retracted open position and a forward closed position of the cartridge chamber; a firing pin located on said breech block; a hammer associated with a control trigger, said hammer turning between a cocked and a firing position, said hammer contacting said firing pin in said firing position; a retaining lever maintaining said firing pin in a retracted position; a cocking slide moving between a forward rest position and a retracted work position, said cocking slide producing the movements of the breech block, the rotation of the hammer in the cocked position and transfer of a cartridge from the magazine to the carrier to send the cartridge to the barrel cartridge chamber following a successive forward movement of the breech block; a closing lever associated with the cocking slide, said closing lever locking the breech block in the forward closed position of the barrel cartridge chamber when the cocking slide is in the forward position; and a longitudinally stationary cartridge stop lever, engaging with said cocking slide, said stop lever mounted on an intermediate pin and moving between an operating interception position of a first cartridge in the magazine tube, when the cocking slide is in the retracted position, and an idle release position of the same cartridge from the magazine tube, when the cocking slide is in the forward position, said cocking slide having a rear slot engaging an action lock lever, said cocking slide having a longitudinal slot provided with two ribs on an intermediate part of the length of its opposite sides and with an inclined shoulder at a rear end of said slot, wherein the intermediate pin of the cartridge stop lever is mounted on a trigger plate, and wherein said stop lever has a front end with a stop protrusion extending through said longitudinal slot and having a front surface facing towards the cartridge magazine, said stop lever having two wings on its sides and two sloping surfaces on a rear side, the stop protrusion intercepting and holding the cartridges in the magazine when said stop lever is in the operating position, the lateral wings of said stop protrusion interacting with the ribs on the sides of the longitudinal slot of the cocking slide to move said stop lever with the stop protrusion in the idle release position during the movements of said cocking slide between the forward and retracted positions, and said inclined surfaces interacting with said shoulder at the rear end of the cocking slide slot to maintain said stop lever with protrusion in the idle position when the cocking slide is in the forward position.