Free-wheel device for transmitting torques and reversible ratchet dog comprising same

Claim 1

A wrench for alternately transmitting torques in either direction comprising a driving element, a resisting element having a slot coaxially rotationally freely mounted in said driving element, a pawl freely mounted in said slot, mutually engaging means upon said pawl and said driving element having mating surfaces, retaining and reacting wall means associated with said slot to exert a reaction force on said pawl so that when combined with a force transmitted to said pawl through said mutually engaging means causes a resultant force on said pawl acting to steadily and uniformly increase the coupling effect under stress of the mating surfaces of said mutually engaging means, said driving element having a cylindric bore with an inner toothed cylindrical wall, said resisting element being housed in said bore, said slot having cylindrical surfaces having an eccentric axis to the axis of said elements and extending concavely thereto, said pawl having two spaced toothed portions, means to shift said pawl in said slot to bring either of said two spaced toothed portions in mesh with said inner toothed cylindrical wall to reverse the torque transmission direction, said means to shift said pawl comprising bush means coaxially fitted and freely rotatable on said elements having means to engage said pawl.