| 摘要 |
The invention comprises a locking plate device for attachment to opposite sides of a electrical breaker switch to prevent accidental movement of the breaker switch from an "Off" to an "On" position. The plate device has a U shaped metal plate with parallel flanges extending from its apex and with the parallel flanges adapted to be placed on opposite sides of the breaker switch and on top of the breaker switch housing. A threaded rod extends through the flanges with a lock nut threaded onto one end and the nut engaged against the outside of one flange, and with an enlarged head on the threaded rod engaging the outside of the other flanges whereby rotation of the screw in one direction will draw the lock nut and one flange toward the other flange to adjust the flanges toward the sides of switches with smaller widths. The plate has a lever arm pivotally mounted on the threaded rod. Cam surfaces are provided on the lever arm near the pivot point of the arm to engage cam surfaces provided on the flange adjacent the arm cam surfaces by rotation of the lever arm whereby the rotation of the lever arm causes the lever arm cam surfaces to engage the flange cam surfaces and cam the one flange of the U plate toward the other flange of the U plate to cause the flanges to move further toward one another to grip and lock the breaker switch between the flanges to prevent its accidental movement from an "Off" to "One" position.
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