| 摘要 |
PURPOSE:To reduce the occurrence of a failure of a switch, by a method wherein, although two switches are provided in the same position, they are individually closed and opened, the switch is released from a hand in the middle of a depressed-turning, and even when the switch is depressed again, an excessive force is prevented from being exerted on the switch. CONSTITUTION:When a shaft 2 is pressed in the direction of a body 1, a depressed-turn pin 5, simultaneously, is moved from a groove 3a to a groove 4a to turn ON switches 10 and 11. When a switch is released from a hand at the full turn angle of a shaft 2 being regulated by a stopper 12, the pin 5 is also disengaged from the groove 4a and is returned to the groove 3a. In this case, through the force of a kick spring 9 accumulated during the turning of a cam 4, the cam 4 is returned to the stop position of a support plate 13 as it is reversely-turned and the switch 11 is turned OFF. With the shaft 2 returned in a reverse direction, a cam 3 forces the returns witch 10 in an OFF- state in a similar manner as described above. Thus, even when the shaft is pressed again, the pin 5 is caused to press the outside of the groove 4a, resulting in the prevention of an excessive force from being exerted on the switch 11.
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