Door release for circuit interrupter rotary handle mechanism

Electricity: circuit makers and breakers – Interlocking – Between plural switches

Patent

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Details

200330, H01H 920

Patent

active

054930847

ABSTRACT:
An operating mechanism for an enclosure-mounted circuit breaker includes a slider for engaging the circuit breaker handle; a shaft-driven pivot for moving the slider between the handle on, off and reset positions; a holder for holding the slider in its reset position; a base plate for supporting the pivot and the slider; and a door-mounted rotary handle for rotating the shaft and operating the pivot. The rotary handle may engage the shaft in the on and off positions, and may be detached from the shaft in the reset position. The pivot may include a first pivot arm having a first cam surface for holding the slider in its reset position. A second cam surface on a second pivot arm may engage a first slider surface from off to on; a second slider surface from on to off, from off toward reset, and to resist reset to off; and an oblique slider surface when adjacent reset. The second cam surface may disengage the oblique surface at reset. Alternatively, the slider may include a notch and the base plate may include a latch for engaging the notch. The pivot may include a single pivot arm having a cam surface which engages a slider surface from off to on; an oblique slider surface from on to off, and from off to reset in order to engage the notch and the latch; and another oblique surface to disengage the notch and the latch from reset to off. The slider may include an oblique shoulder for moving the handle from on to off and from off to reset, for resisting the handle force from reset to off, and for using the handle force to engage the notch and the latch in the reset position in order to substantially decouple the handle force from the rotary handle.

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Instructions for Drilling and Assembling Series C Rotary Handle Mechanism for K-Frame Series C Circuit Breakers, Molded Case Switches, and HMCPs, pp. 1-4, Nov. 1993, Westinghouse Electric Corporation I.L. 15600-A, File 29-000.

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