Patent ID: 6427559
Filing Date: 2002-08-06
Classification: B25B

Abstract:
A universal power tool, comprising two interchangeable first housing units having a first axis; two interchangeable second housing units, one of said two first housing units having a cam mechanism to be turned by an outside power source, the other of said two first housing units having a cylinder-piston arrangement with a piston rod movable by fluid power, each of said two second housing units having a lever-ratchet mechanism, different engaging means for engaging a threaded connector to be tightened or loosened, and also having a second axis perpendicular to said first axis; means for interchangeably connecting one of said two second housing units to one of said two first housing units, so that upon rotating said cam of said one of said two first housing units in one direction said cam mechanism imparts a movement along said first axis, and upon moving a piston of said other of said two first housing units a piston rod imparts a movement along said first axis, each of said movements along said first axis being applied to said lever-ratchet mechanism to make one end of a lever to move along said first axis and another end of said lever to turn around said second axis, and thereby when said cam is turned by an outside tool or said piston rod is moved along said first axis by fluid power, said lever-ratchet mechanism is moved forward and backward to ratchet the fastener in a single turning direction.