AUTOMATIC PNEUMATIC MARKER Russian patent published in 2004 - IPC

FIELD: simulation of use of hand firearm. SUBSTANCE: the marker has a working chamber accumulating the gas required for a shot, determined by the diameter of the calibrated hole of a double-diameter reducing cylinder and by the force of elasticity of the mainspring acting on the breechblock, which in the extreme rear position locks the given hole by the rod and opens the gas feed valve. The gas feed valve is open until the gas pressure on the breechblock rod exceeds the force of elasticity of the mainspring and the breechblock starts moving forward. Gas through the calibrated hole is fed to the feed duct of the reducing cylinder. The stepped increase of the force of gas action on the feed piston of the breechblock is determined by its larger cross-section area as compared with the calibrated hole. The length of the feed piston of the breechblock and the extent of the feed duct of the reducing cylinder ensure holding of the gas in the working chamber practically to the complete feed of the ball to the barrel. At a complete locking of the bore by the breechblock its feed piston comes out of the feed duct of the reducing valve opening the passage for gas through the gas conduit holes and the central duct of the breechblock to the bore. The gas acting on the whole end-face area of the breechblock holds it in the extreme forward position up to the complete fly-out of the ball from the bore. At a drop of gas pressure the breechblock starts backward motion under the action of the mainspring. The cycle is completed. EFFECT: enhanced simplicity and reliability of the structure, compactness, stability of the shot characteristics, universality. 6 dwg