Alpha Corporation

Glory Ltd.

Shunichi Osada

Haruhisa Nakajima

Tumbler pinsare movably housed in a plug. A locked/unlocked state is determined by the turning position on the moving direction center axes of the tumbler pins. An unlocking keyto be inserted into the plugis provided with unlocking code forming recessesfor determining the turning positions of the tumbler pins at code decision positions. The tumbler pinsare provided at their leading end portions with drive portions, which have slope sides of conical faces gradually reduced in diameter toward the leading ends and having rotational centers offset from the moving direction center axes. The side wall faces of the unlocking code forming recessesare formed of conical faces having rotational centers substantially aligned with those of the conical faces forming the slope sides of the drive portions. At code decision positions, the slope sides of the drive portionsare forced to contact with the side wall faces of the unlocking code forming recessesthereby to determine the turning positions of the tumbler pins

Cylinder lock device

An unlock system does not use a key that might be copied so that only a correct person can unlock a door and security is enhanced. Unlock records of door-lock are stored in a limited memory capacity in volume. Fingerprint data input to a fingerprint input sectiondisposed outside a doorprovided on a doorwayis detected, and the detected fingerprint data is verified against previously registered fingerprint data. If it was confirmed that the detected fingerprint data coincided with the registered fingerprint data, an unlock signal is output to unlock the door-lock, and a setting time or start-using time is stored in a storing section having a clock function.

Method and system for unlocking doorway

A cylinder lock having a key insertion hole or clearance formed between a casing and a key guide member. A key for the cylinder lock is provided with a thin cylindrical member which is to be inserted into the annular key insertion hole when the key is inserted into the cylinder lock. The cylindrical member is filled at its first end section with a part of a key shank. A slider is slidably disposed inside the cylindrical member and normally located inside the second end section of the cylindrical member. The slider is formed at its tip end with a fitting projection which is to be fitted in a guiding depression formed at the tip end face of the key guide member. The key insertion hole is formed narrow or thin, corresponding to the thin cylindrical member of the key, thereby preventing a picking tool from being inserted through the narrow key insertion hole into the cylinder lock.

Axial tumbler cylinder lock and key

A cylindrical lock includes a casing having an annular front face with an inner circumferential portion surrounding a key insert member received by a key. A keyhole is defined between the inner circumferential portion and the key insert member, a lower portion of the key insert member is displaced from an axial center of a lock cylinder by a predetermined distance. The key includes a cylindrical end received by the key hole. A thickness of an upper side of the cylindrical end is different from a thickness of the lower end such that, when the key is rotated, the displaced lower side of the key insert member causes a width of portions of the keyhole to be varied. Thus picking of the cylindrical lock with a picking tool or the like is prevented.

Growing community of inventors

Yokohama, Japan

Shunichi Osada