Cylinder lock device

A cylinder lock device comprising:

• a cylinder lock having a tumbler pin movably mounted in a plug, wherein a locked/unlocked state of the cylinder lock is determined by a turning position of the tumbler pin around a moving direction center axis;
• and
• an unlocking key adapted to be inserted into the plug and having an unlocking code forming recess for determining the turning position of the tumbler pin at a code decision position,
• wherein the tumbler pin is provided at a leading end portion with a drive portion, the drive portion having a conical face as an outer circumference gradually reduced in diameter toward the leading end, wherein a rotational center of the conical face of the drive portion is offset from the moving direction center axis,
• the unlocking code forming recess is provided with a conical face as an inner circumference having a rotational center substantially aligned with the rotational center of the conical face of the drive portion,
• at the code decision position, the conical face of the drive portion is forced to make contact with the conical face of the unlocking code forming recess so as to determine the turning position of the tumbler pin,
• wherein the tumbler pin includes a flat face which is parallel to the moving direction center axis, and a turning range of the tumbler pin is restricted by the flat face engaging a tumbler turn regulating projection.

A cylinder lock comprising:

• a plug including a key insertion portion and a tumbler pin, wherein the key insertion portion is longitudinally formed at a center portion of the plug, the tumbler pin is movable in a direction into and out of the key insertion portion, and the tumbler pin is turnable on a moving direction center;
• a cylinder case into which the plug is turnably inserted, wherein a drive pin for applying an urging force to the tumbler pin toward a protruding side to the key insertion when the plug is at an initial turning position;
• and
• a locking portion for opening/closing a turning boundary between the plug and the cylinder case in accordance with a turning position of the tumbler pin,
• wherein the tumbler pin is provided, at an end position on a side of the key insertion portions, with a drive portion having a conical face gradually reduced in diameter toward a leading end, and a rotational center of the conical face of the drive portion is offset from the moving direction center axis,
• wherein the tumbler pin includes a flat face which is parallel to the moving direction center axis, and a turning range of the tumbler pin is restricted by the flat face engaging a tumbler turn regulating projection.