Patent ID: 7836737

Claim:
A lock comprising, in combination: a case including inner and outer sides, with the case further including a faceplate extending between the inner and outer sides and having an opening; a key cylinder mounted to the outer side of the case and including a lock core and an actuating member drivable by rotation of the lock core; a thumb turn rotatably mounted to the inner side of the case and including a shank; a deadbolt mounted in the case and having a deadbolt axis, with the deadbolt including a head slideably received in the opening of the faceplate and a driving plate fixed to the head, with the head being movable along the deadbolt axis between a retracted position in the case and an extended position outside the case; first and second hooks each having first and second ends and a pivotal portion between the first and second ends, with the pivotal portion of each of the first and second hooks being pivotably mounted to the head and defining a pivot axis perpendicular to the deadbolt axis, with the second end of each of the first and second hooks being pivotable through the opening between a retracted, unlocking position in the case and an extended, locking position outside the case about one of the pivot axes; and a pivotal member including a first end coupled with the driving plate to move therewith, a second end operably connected to the actuating member, and an intermediate portion between the first and second ends of the pivotal member and coupled with the shank of the thumb turn, with the head being movable between the retracted position and the extended position along the deadbolt axis when the lock core or the thumb turn is turned, with the second end of each of the first and second hooks moving together with the head along the deadbolt axis in a first direction and pivoting from the retracted, unlocking position to the extended, locking position about one of the pivot axes when the head is moving from the retracted position to the extended position, and with the second end of each of the first and second hooks moving together with the head along the deadbolt axis in a second direction reverse to the first direction and pivoting from the extended, locking position to the retracted, unlocking position about one of the pivot axes when the head is moving from the extended position to the retracted position.