Electricity: circuit makers and breakers – High-potential type – Rotating and pivoted
Patent
1976-12-01
1978-09-05
Marcus, Stephen
Electricity: circuit makers and breakers
High-potential type
Rotating and pivoted
H01H 3102
Patent
active
041122682
ABSTRACT:
A double break air disconnecting switch for high voltage electric power installations having a switchblade fixed to a rotatable center insulator for unitary movement therewith and fixed jaw contacts mounted at the ends of the switchblade. A pivoting contact bar which is engaged by one of the jaw contacts is supported from each outside insulator stack. Each contact bar is pivotally supported from the associated insulator stack for movement between a closed position in high pressure engagement with the jaw contact and an open position not in high pressure engagement with the associated jaw contact. During closing as the contact bar pivots from the open position to the closed position, the contact bar pivots around its longitudinal axis with respect to the jaw contact from the low pressure engagement position to the high pressure engagement position. The contact bar is supported on a terminal assembly which also includes a pivot locking device for locking the contact bar in the open position until the associated jaw contacts are fully inserted around the contact bar. The jaw contact when properly disposed around the contact bar releases the pivot lock and permits the contact bar to pivot to the closed position. The pivotable portion of the terminal assembly also includes a hook portion which is engaged by a sleeve portion supported from the jaw contact for positive movement of the terminal assembly to the open position when the switchblade is moved to the open position. Contact through the terminal assembly is maintained by sliding or rotating contact surfaces and no flexible braid or cable is required. The jaw contact is of the reverse loop type. The reentrant portion of the contact jaws are biased together by the springs which are partially insulated from the contact surfaces. An insulating spacer is disposed between the free ends of the reentrant contact portions for maintaining uniform spacing therebetween. The pivot portion of the terminal contact is provided with stops to limit travel when moving to the open or closed positions.
REFERENCES:
patent: 1792282 (1931-02-01), Crabbs et al.
patent: 1854441 (1932-04-01), Alsaker et al.
patent: 2132686 (1938-10-01), Hampton
patent: 2709739 (1955-05-01), Gilliand et al.
patent: 3052786 (1962-09-01), Bertling
H. K. Porter Company, Inc.
Marcus Stephen
Yeager Robert D.
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