| 摘要 |
An operating handle is provided for use with a switch apparatus enclosed in an enclosure with a door having an aperture. The handle is securable to the door and the switch apparatus has a control shaft extending through the aperture and revolvable to set the switch apparatus between on and off positions. The shaft has a transverse pin at its end portion extending through the aperture. The handle has a housing and a locking lever movably mounted in the housing between locking and non-locking positions for blocking a swiveling of the operating handle. The handle also has a latching plate movable in the housing and having an opening penetrable by the end portion of the shaft when the switch apparatus is in the off position. A control member is connected between the lever and the plate for displacing the plate in response to a movement of the lever to the locking position, the plate being displaced transverse of the end portion of the shaft to prevent the latter from being withdrawable through the opening. There is also a spring connected between the housing and the plate for likewise displacing the plate transverse of the end portion to prevent the latter from being withdrawable through the opening when the switch is in the on position. In addition, a stop securable to the door is provided for holding the plate when the switch apparatus is in the off position, the plate being held by the stop so that the opening is in alignment with the end portion of the shaft.
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