Sughrue Mion, PLLC
Switchgear operating apparatuses
A compact, lightweight and low-cost operating apparatus for a switchgear include a second cam (50) turned counterclockwise by an electric motor begins to maintain contact with a closing lever (37) at a first angular position (POS1), turns the closing lever (37) counterclockwise to energize a circuit-making coil spring (77), and causes a closing latch (48) to lock the closing lever (37). The second cam (50) further turning counterclockwise becomes separated from the closing lever (37) and actuates a cam switch (156) at a second angular position (POS2) to interrupt an electric current supplied to the electric motor. The second cam (50) further turns due to inertial turning of the electric motor and is braked by a elastic brake member (159) at a third angular position (POS3), whereby the second cam (50) stops within a specific angular range &Dgr;&thgr; of rotation. Despite its simple structure, the elastic brake member (159) can halt the second cam (50) in a reliable fashion.
Mitsubishi Denki Kabushiki Kaisha
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additional inventional additional
Kyoichi Tomohito Nobuya
Ohtsuka Mori Nakajima