Abstract: An improvement in an actuator of the type having a slide plate with an L-shaped slot, guide structure for movement of the slide plate in a reciprocating path between locked and unlocked positions, structure for connecting the slide plate to a locking member so that the locking member follows reciprocating movement of the slide plate, a crank for rotation about an axis and having a pin offset from the axis, and structure mounting the crank to the channel so that the crank is rotatable back and forth about its axis through a predetermined range with the pin in the slot to thereby cause the pin to engage and shift the slide plate between its locked position and its unlocked position upon the crank being rotated. With the pin at the juncture of the two slot legs, the slide bar can be shifted to its unlocked position without rotating the crank. With the pin so situated and all drawers closed, the crank is jammed and cannot be rotated.