Abstract: A locking device for opening or closing a door comprising a lock housing having a pair of holes formed in the front surface thereof; a slider which can slide within the lock housing; a pair of clamps, the base end of each of which is pivotally mounted on the front end of the slider, and the other end of each of which has a spring force acting outward, and the both ends of which are pushed from outward to inward in the direction where the both ends are compressed when the clamps go backward within the lock housing; a spring member for the clamps attached to the front end of the slider such that said pair of clamps are opened in an approximately V-shape; a spring member for the slider which is intervened between said lock housing and said slider and which applies a spring force to said slider in the direction forward to the hole of the lock housing; a heart-shaped groove which is carved in one side of said slider, has a plurality of differences in depth, and a recess provided on the bottom portion of the heart

Abstract: A locking device for opening or closing a door comprising a lock housing having a pair of holes; a slider slidable within the lock housing; a pair of clamps, the base end being pivotally mounted on the front end of the slider, and the other end having a spring force acting outward; a spring member for the clamp attached to the front end of the slider; rails each provided on the outside of the pair of clamps in the lengthwise direction; a pair of rollers each having a circular shape, which can be fitted with each of the rails, and are supported to be revolved in adjacent to the holes of the lock housing; a spring member for the slider which is intervened between the lock housing and the slider and which applies a spring force to the slider in the direction forward to the hole of the lock housing; a heart-shaped groove carved in one side of the slider, having a plurality of differences in depth, and a recess provided on the bottom portion thereof; a projecting member, one end being slidable in the groove only i

Abstract: Locking devices for kitchen doors, drawers or like closure structures comprise a locking mechanism fixed to the cabinet supporting the door and a key unit mounted on the door. The locking mechanism includes a heart-shaped groove having a recess in which a projecting member in the device lodges under spring bias when the device is in the locked position. Operation of the devices to lock a door is achieved by pushing the door toward the cabinet so the key unit engages the locking mechanism and the projecting member moves in the heart-shaped groove until it lodges in the recess to firmly lock the door. Opening such a locked door is achieved by first pushing the door further closed so that the key unit enters deeper into the locking mechanism to cause the projecting member to disengage from the recess which then allows the door to move forward to an unlocked position. Several embodiments of the devices are disclosed.