Patent ID: 7765897

Claim:
A ratchet wrench, comprising: a body unit which has a circular groove at a first side and a stop member; a head unit which includes a housing rotatably passing through a circular groove of the body unit, and a ratchet gear engaged at an outer rim of the housing and is selectively rotatable in one direction as the ratchet gear is engaged with the stop member; a worm screw which is rotatably pin-engaged in an interior of the housing; and a pair of arms of which one end of each arm is inserted into the interior of the housing and is pin-engaged therein with a thread being formed on an upper side of each arm and being engaged with the worm screw; and an adaptor having an upper portion which is detachably engaged to a lower end of each arm, and a lower portion which is detachably attachable to a wrench socket, wherein said adaptor includes (a) an arm engaging unit having an arm engaging groove formed in an interior of the upper portion and a guide unit protruding from a center of the arm engaging groove, and (b) a socket engaging unit which has a rectangular cross section and protrudes away from the arm engaging unit.