Rotary tool e.g. hydraulic screwdriver has ratchet element cooperating with ratchet wheel when defined torque is reached

摘要

The rotary tool has a lever (1) supporting a toothed ratchet wheel (2) engaged by a cooperating ratchet element (3), for blocking the rotation of the ratchet wheel, supported by a sliding pressure plate (7) which has an ellipsoidal curved surface (6) cooperating with a complementary curved surface (5) of the ratchet wheel.