| 摘要 |
Improved blade-type, air dielectric switchgear apparatus is provided having spring loaded, fast acting, operator independent mechanism for selective opening and closing of internal switch contacts. Preferably, the operating mechanism includes a pair of opposed, pivotal, notched, scissor-like arms with a rotatable latch plate therebetween; a pair of latching pins are carried by the plate, and the latter is operably connected with a power spring assembly. A trip element is also provided which, upon rotation thereof in either a clockwise or counterclockwise direction, serves to shift a corresponding arm away from the latch plate to disengage the latching components. At this point a high velocity rotational movement is imparted to the latch plate by the spring assembly to rotate the latch plate to a second position wherein the plate and the opposed arm come into latching engagement. The trip element is provided with stops to prevent pivoting thereof to an over center condition with respect to the power spring assembly, thereby eliminating the possibility that a lineman operating the switchgear will mistakenly believe that the switchgear contacts have been separated, when in fact they have remained in engagement. The pin and notch latching arrangement is also designed to give a positive weld break function during initial stages of operation of the mechanism. The switchblade shaft is preferably pivotally supported by means of an inexpensive threaded connection which also gives a degree of axially adjustability to the shaft.
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