Patent ID: 7316141

Claim:
A mechanism for an electro-mechanical lock comprising: a shackle or strike moveable in a bore; a cam rotatable between a first cam position in which the shackle or strike may be immobilized in the bore and a second cam position; a blocking pin moveable between a first pin position in which rotation of the cam is prevented and a second pin position in which rotation of the cam is not prevented, the blocking pin being spring biased into the first pin position; a solenoid having a plunger with a stable extended position in which movement of the blocking pin from the first pin position to the second pin position is prevented and with a stable retracted position in which movement of the blocking pin is not prevented, wherein, when the solenoid is brought to its retracted position, the cam can rotate from its first position towards its second position as the shackle or strike is removed from the bore, causing the blocking pin to move from its first position to its second position, and wherein, when the solenoid plunger is cocked against the blocking pin, insertion of the shackle or strike into the bore causes the cam to rotate from its second position towards its first position, so as to immobilize the shackle or strike in the bore allowing the blocking pin to assume its first position, and allowing the solenoid to assume its extended position.