| 摘要 |
PCT No. PCT/JP93/01226 Sec. 371 Date Jul. 19, 1994 Sec. 102(e) Date Jul. 19, 1994 PCT Filed Aug. 31, 1993 PCT Pub. No. WO94/06141 PCT Pub. Date Mar. 17, 1994.The safety switch unit controls the source of power for machinery in accordance with the opening and closing of a room door. The safety switch includes an actuator (2) secured to a door, a cam shaft extending transversely of a direction in which the actuator (2) advances into the switch unit (1), the actuator (2) having a stepped top end in correspondence to which cam plates (13), (14a) and (14b) are provided within the switch unit (1) each capable of independently rotating, these cam plates having start sides (17) and (22) and a single cam follower pin (29) passed therethrough, thus protecting the switch unit (1) against mischievous or malicious operation.
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