PISTOL FOR ABRASIVE-PNEUMATIC TREATMENT OF SURFACE Russian patent published in 2001 - IPC

FIELD: mechanical engineering. SUBSTANCE: pistol contains housing with branch pipe for separate supplying of material to the chamber provided with a nozzle for supplying abrasive that forms a circular clearance and conic-cylindrical outlet nozzle. The pistol is provided with bushing, wherein critical section is made up, and coupling nut, which fixes operating position of the bushing and the critical section. The bushing is mounted inside the housing for axial movement. The nozzle is mounted into the branch pipe for supplying the abrasive material for axial movement. The generatrix surface of the critical section of the bushing is inclined at an angle of 40-60^o to the center line. The external generatrix surface of the nozzle supplying abrasive is made as a truncated cone whose generatrix surface is inclined at an angle of 40-45^o. The back wall of the chamber opposite to the convergent tube part is at an angle of 45^o to the axis. The branch pipe for supplying the abrasive material is mounted inside the housing for axial movement and adjustment on the thread. The inclined side surface of the housing and end face surface of the coupling nut is graduated with scales to define the amount of displacement of the critical section with respect to the nozzle for supplying the abrasive material. EFFECT: improved method, wide range of control modes of operations of the pistol . 6 cl, 4 dwg, 1 tbl