PERCUSSION MECHANISM FOR POWER NUT-DRIVER Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: combined percussion unit begins to rotate when drive is set in operation. Weights 18 begins to press to walls 11 of driving part 6 of the percussion member. When a given angular velocity of the percussion member is achieved, its driven part 7 begins to move along its axis in the direction of anvil 3 by pressing spring 8. When driven part 7 rotates, the face of the control pin rolls up the side surface of journal 14. If journal 14 rotates by the angle, at which roller goes out the flat, driven part 7 of the percussion member will displace in the axial direction to anvil 3 so that the control pin will come into contact with shaped face surface 15 and will roll it up. Driven part 7 of the percussion member will move with high speed over the screw trajectory in the direction of anvil 3 until its side surface 12 strikes against working cams 4. Energy, which accumulated by the percussion member, will transmit to anvil 3 which will rotate and tighten a threaded joint. EFFECT: improved design. 2 cl, 3 dwg