| 摘要 |
An electric safety device for controlling a power switch 8 and a grounding switch 9 of a high voltage electric device includes a motor 10, a threaded shaft 4 driven by the motor, a movable sleeve 5 on the threaded shaft for being driven by the motor to and fro, and a pair of rotary members 6, 7 each of which includes a wheel 62, 72 having a recess on its periphery, a rod 61, 71 axially extending from its center, and a U-shaped guide piece 63, 73 radially extending from the rod. The rods are parallel to one another and are disposed near the shaft perpendicularly, and the guide pieces are movable one after the other through 90 DEG when pushed by the sleeve to cause the rods and the wheels to rotate. The periphery of one of the wheels cams the power switch off and the periphery of the other wheel thereafter releases the grounding switch when they rotate to safely enable maintenance work.
|
