Buchanan Ingersoll & Rooney PC
Operating device for power switchgear
An operating device for a power switchgear includes: an output lever coupled to a movable-contact of the switchgear; a torsion bar releasing an accumulated force when the switchgear is opened to rotate the lever in the counterclockwise direction and drive the movable-contact in an opening direction; an opening latch engaged with the lever to hold an accumulated force of the torsion bar; a cam rotating when the switchgear is closed, having contact with the lever to rotate the lever in the clockwise direction, and driving the movable-contact in a closing direction; another torsion bar releasing the accumulated force when the switchgear is closed to rotate the cam; and a closing latch which can be engaged with the cam to hold the accumulated force of the torsion bar. The cam includes opposed cam elements, a pin whose ends are rotatably supported by the elements, and a bolt fastening the elements.
MITSUBISHI ELECTRIC CORPORATION
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Tomohito Shuichi
Mori Tanigaki