Lock structure with direction-changeable device

A direction-changeable lock structure, comprising a latch case having a faceplate and side walls, a sliding latch and a latch bolt provided with a notch or recess therein for pivotally fixing a cam-type bolt therein by means of a positioning pin and a pin hole and a disc located at a rear end of the latch bolt and engaging in a groove of the latch and capable of revolving movement therein, said cam-type bolt having a protrusion with a pin hole therein for a positioning pin to be inserted therethrough as well as through a selected set of a pair of opposing sets of ears with holes therein, said sets being provided on opposite sides of the case respectively, the latch further having a removable transverse pin extending through a movement-limiting slot in one side wall of the case whereby removal of the transverse pin allows increased sliding movement of the latch for projecting the latch bolt through an aperture in the faceplate to allow revolving movement of the latch bolt so as to change its direction.