Buchanan Ingersoll & Rooney PC
Spring operation device for switchgear
A spring operation device for use in a switchgear includes an interlock bar, attached at its one end to a lock plate and includes a switch-on electromagnet that has a plunger provided with a flange portion. The lock plate is pushed by a lock member that is attached to a four-joint link and the position of the lock plate is changed by being rotated. During an opening operation of a switching contact, the other end of the interlock bar is arranged above the flange portion to stop the forward movement of the plunger of the switch-on electromagnet so as to prevent a switch-on trigger from rotating. During a closing operation of the switching contact, the other end of the interlock bar is arranged at a position that does not stop the plunger of the switch-on electromagnet from moving forward so that the switch-on trigger is allowed to rotate.
MITSUBISHI ELECTRIC CORPORATION
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Tomohito Shuichi
Mori Tanigaki