Patent ID: 7536887
Filing Date: 2009-05-26
Classification: E05B,Y10T

Abstract:
1. A cylinder lock comprising: a cylindrical sleeve turnably disposed in a holder, the cylindrical sleeve comprising lock grooves formed on an inner circumferential surface and an installation hole at a first end; a cylinder turnably disposed in the cylindrical sleeve, the cylinder comprising a plurality of tumbler insertion holes extending in a direction orthogonal to a longitudinal axis of the cylinder, the cylinder further comprising an open end and a cut-out portion provided in a sidewall of the cylinder; a plurality of tumblers reciprocally disposed in the tumbler insertion holes, wherein the plurality of tumblers are engagable with the lock grooves in an advanced position and disengageable from the lock grooves in a retracted position, wherein the retracted position corresponds to insertion of an authorized key; a rear rotor at least partially disposed in the open end of the cylinder and turnable in the cylinder, the rear rotor comprising a container portion corresponding to the cut-out portion in the cylinder; a connecting member disposed in the container portion and movable in radial directions between a connected position in which the rear rotor and the cylinder are connected by the connecting member protruding into the cut-out portion of the cylinder and a non-connected position in which the connecting member disengages from the cut-out portion of the cylinder such that the rear rotor and the cylinder are disconnected; and a connection releasing member positioned on an outer circumference of the connecting member and movable in radial directions within the installation hole of the cylindrical sleeve, the connection releasing member being operable to travel radially so as to displace the connecting member to the non-connected position when the cylindrical sleeve turns relative to the holder wherein a biasing member for biasing the connecting member toward the connected position is provided in the container portion for the rear rotor, and wherein the connection releasing member is engaged by the connecting member and receives a biasing force from the biasing member such that the connecting member is engaged with the cutout portion and wherein the connection releasing member is held in a lock recess formed on an inner circumferential surface of the holder when the connecting member is in the connected position.