Patent ID: 8347679

Claim:
An unlocking device comprising: a casing adapted to be mounted to a side of a lock having a keyhole, with the casing including a compartment extending along an axis and having first and second openings spaced along the axis, with the keyhole located in an extent of the first opening, with the casing further including a lateral opening formed in a peripheral wall of the casing and in communication with the compartment; a movable body rotatably received in the compartment of the casing about the axis, with the movable body including a closed end and an open end spaced from the closed end along the axis, with an insertion space defined between the closed end and the open end, with the insertion space having an insertion hole in the open end, with the closed end having a through-hole, with the movable body further including a lateral opening formed in a peripheral wall of the movable body extending between the closed end and the open end along the axis and in communication with the insertion space, with the movable body including a restraining portion formed on a side of the lateral opening of the movable body to limit angular movement of the movable body about the axis relative to the casing; a key receiving seat received in the insertion space of the movable body, with the movable body rotatable relative to the key receiving seat between a first position and a second position, with the key receiving seat including a passage extending from a first side through a second side along the axis and having an enlarged receiving section, with the keyhole of the lock being blocked by the closed end of the movable body when the movable body is in the first position, with the through-hole of the movable body, the passage of the key receiving seat, and the keyhole of the lock aligned with and facing one another when the movable body is in the second position; and a linking rod extending through the passage of the key receiving seat, with the linking rod including first and second end spaced along the axis, with the first end of the linking rod having an engaging portion, with the second end of the linking rod being manually rotatable, with the engaging portion being used for engaging with a key, so that the key and the linking rod are able to jointly move along the axis and jointly rotate about the axis.