Patent ID: 8353187

Claim:
A lock comprising: (A) a case body; (B) a shackle connected to the case body movable in a bore; (C) a sliding block connected to the case body with an end spring switching between an immobile state in which the shackle is immobilized in the bore and a mobile state in which the shackle is movable under an external force; (D) a major electromagnetic switch system controlling the movement of the sliding block and including (1) a body comprising a solenoid and a magnet; (2) a rod movable inside the solenoid between a first rod position in which the sliding block is immobilized and a second rod position in which the sliding block is mobile; (3) an end cap block mounted flexibly on the rod of the major electromagnetic switch stabilizing the sliding blocking and reducing the force from the sliding block on the rod of the major switch; (E) a minor electromagnetic switch system including (1) a solenoid body; (2) a rod movable inside the solenoid; (3) a stop plate mounted on the case body, and the slot of the stop plate floated on the rod of the minor electromagnetic switch with a spring; the stop plate is movable between a first plate position in which the rod of the major electromagnetic switch system is immobilized and a second plate position in which the rod of the major electromagnetic system is mobile; (F) a return switch with a return block attached by a return spring to apply a locking signal to the major electromagnetic switch when pushed down by the shackle; (G) a power source from which the power should be shut off if no operation within a predetermined amount of time.