Kumahira Safe Co., Inc.

Makoto Nishikawa

Minoru Tanaka

Eiro Naruto

Kazuyuki Oki

Hiroaki Tomoda

Kouichi Hirano

Takeo Inada

An improved clock lock of the type using an electronic timer circuit as clock mechanism is disclosed. A locking member is actuated toward the unlocked state in response to unlocking signal generated by the electronic timer circuit. The clock lock includes motors adapted to be activated in response to unlocking signal, cams in operative association with the motors, a movable plate normally held in the locked state in the casing to move toward the unlocked state by means of a first cam when any one of the motors starts its rotation, a locking member normally held at the locked position on the movable plate in the casing to turn to the unlocked position by the effect of moment caused by its own dead weight when it is released from the locked state, and a motor driving circuit which is so designed that none of the motors is activated toward the locked state as long as any one of the motors has failed to finish rotation toward the unlocked state by means of microswitches which are in operative association with second cams. Usually, the locking member is designed in the form of an unbalancedly weighted lever. The first cam is preferably designed in the form of a circular cam which is eccentrically mounted on the cam shaft, while each of the second cams is designed in the form of a sector cam. One of the second cams is mounted on the cam shaft at a delayed angle relative to other ones.

Clock lock

A locking and unlocking device particularly employable for a double lock system such as a bank lock and a client lock is disclosed. To operate the bank lock, a magnetic card specifically allocated to a client is inserted into a casing or cover through a card insert hole until a plurality of magnetized points on the magnetic card are located in alignment with the corresponding permanent magnet pins, which are held in engagement holes on a sliding member or lever. Polarities and coordinate positions of the magnetized points on the magnetic card are previously determined by means of an encoder. The permanent magnet pins are brought in disengagement from the engagement holes under the influence of magnetic repulsive or attractive force developed between the permanent magnet pins and the magnetized points on the magnetic card when the latter is inserted through the card insert hole. After the sliding member or lever is free from the permanent magnet pins, it is displaced in such a direction that a window formed on the bottom of the casing or the base member becomes exposed to the outside and thereafter the client inserts his key through the window to open the client lock. The cover is slidably fitted to the base member, and after the magnetic card is inserted, it is displaced in the opposite direction to that of insertion of the magnetic card. Safe room entering and leaving readers are preferably fitted to an automatic door for the rental safe room.

Locking and unlocking device

Growing community of inventors

Hiroshima, Japan

Makoto Nishikawa