Idec Izumi Corporation

Naruhito Sasaki

Takao Fukui

Shigeru Tsujimura

Toshiyuki Kasama

Toshio Watanabe

A safety switch in which one piece of cam plate 1 (51) which rotates and moves the operating rod 6 (7) of the contact of the switch portion as the actuator 102 enters the operating portion 111 (511), and the lock plates 2, 3 (lock pieces 52, 53) are arranged on the side of the cam plate 1 (51) to form a lock mechanism for restricting the rotation of the cam plate 1 (51) so that the lock mechanism of the cam plate 1 (51) by lock plates 2, 3 (lock pieces 52, 53) is released and the cam plate 1 (51) is rotated only when the actuator 102 enters, thereby preventing the operating portion from being operated by any tool other than the special-purpose actuator. In one of the specific embodiments, the cam plate 1 is formed with recesses 1a, 1b and lock grooves 1c, 1d, and the lock plates 2, 3 are respectively formed with inclined surfaces 2a, 3a and engaging pawls 2c, 3c for fitting into the lock grooves 1c, 1d. The lock plates 2, 3 are formed on each side of the cam plate 1 and rotatably supported to the support frame 11 via spherical fulcrums 2d, 3d which are integrated on the bottom end of the lock plates 2, 3. Springs are fitted between the lock plates 2, 3 and the support frame 11. In another structure, the cam plate 51 is formed with a recess 51a and a lock stepped portion 51b, and the lock pies 52, 53 are respectively formed with inclined surfaces 52a, 53a and engaging pawls 52b, 53b for latching the lock stepped portion 51b. The engaging pawls 52b, 53b are pressurized against the outer circumferential surface of the cam plate 51 by a spring.

Safety switch

An operation indicating device for electromagnetic relay which comprises a working member interlockable with an armature of an electromagnetic relay and extending into a space above a yoke, and an indicating member coupled to the working member and having an axis rotatably supported in the space above the yoke, the indicating member having a recognizable indicating portion and being rotatable by the working member interlocking with the armature during the operation of the armature, the indicating portion of indicating member thus rotated arriving at a position corresponding to an indication window formed in a case cover. When the armature is activated, the working member, interlockable with armature, is activated and the indicating member coupled to the working member is rotated around a supporting shaft serving as the fulcrum. The indicating portion of the indicating member moves to a position located immediately below an indication window formed in the case cover and the operation of the electromagnetic relay can be visibly confirmed.

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Osaka, Japan

Naruhito Sasaki