HYDRAULIC SCREWDRIVER Russian patent published in 2001 - IPC

FIELD: handle tool with drive used for screwing and unscrewing threaded connections. SUBSTANCE: hydraulic screwdriver contains housing receiving hydrocylinder with rod-piston, ratchet gear containing connecting rod, ratchet wheel, spring-loaded power and counter- returning pawls, and spindle mounted inside the ratchet wheel. Piston end of the connecting rod is mounted for motion inside the spherical support rigidly fixed in the rod-piston. The power pawl is placed between levers. The levers are mounted on the journal of the ratchet wheel and connected by one axle with the connecting- rod and power pawl. The pawl is provided with one fixed and one movable tooth. The movable tooth is spring-loaded and mounted with space inside the semicircular slot. The slot is provided in the operating zone of the power pawl. EFFECT: simplified structure and enhanced reliability of due to enhanced reliability of the ratchet gear. 3 dwg