Takigen Seizou Co., Ltd.

Naoyuki Sugimoto

A double-acting locking device of the axial pin tumbler type for joint control. A rotary plug, a control plug, a master plug and a stationary plug fit in contact with each other within a cylinder. Connections and disconnections between those plugs are effected by the actions of top pins, master pins and bottom pins, all of which fit into axial pin holes formed in those plugs and are spring-biased forward. The selection of the connections and disconnections of the plugs is effected by a first key, a second key, and a master key. The rotational directions and angles of the actuating shaft set by the first and second keys are controlled by the actions of front and rear face projections on the control plug, a rear face recess of the rotary plug, and a front face recess of the master plug.

Double-acting locking device for joint control

A photoelectric key switch device for preventing error of the output timing of electrical signals from a group of light-receiving elements, while operating an electric processing unit by signals that are simultaneously produced. The device is provided with a rotor having a notch that forms optical paths between the elements of a group of light-emitting and light-receiving elements, other than one set of elements, when a key is inserted into the rotor and the rotor is rotated through a pre-determined angle. Another notch forms an optical path between the set of elements and the aforementioned one set of elements when the rotor is additionally rotated through an angle .alpha..

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Koganei, Japan

Naoyuki Sugimoto