Center break switch with reduced opening force requirement

Details Center break switch with reduced opening force requirement Center break switch with reduced opening force requirement

2006-01-10

2006-01-10

Fishman, Marina (Department: 2832)

Electricity: circuit makers and breakers

High-potential type

Rotating and pivoted

Reexamination Certificate

active

06984795

ABSTRACT:
A switch has respective open-assist bars fixed to switch blades near the switch contacts. The bars are arranged so that, as the blades are turned by rotation of their supports, the bars come together and serve as a fulcrum mechanism that provides a prying action helping reduce the required opening force. The action of the fulcrum mechanism overcomes friction between the contacts that may otherwise tend to cause bowing of the supports with appreciable increase in the required opening force.

REFERENCES:
patent: 2835756 (1958-05-01), Bagnagatti
patent: 3227830 (1966-01-01), Ransom
patent: 3348002 (1967-10-01), Upton, Jr.
patent: 3566061 (1971-02-01), Bernatt
patent: 4244825 (1981-01-01), Grinninger
patent: 4759869 (1988-07-01), Ohno et al.
patent: 5061833 (1991-10-01), Hodder et al.
patent: 5293012 (1994-03-01), Levi
Cleaveland/Price Inc., Bulletin DB-126A02, “Aluminum Center Break Switch”, (published 2002).
Porter, Catalog 1-055, Issue No. 1, Nov. 1974, “LPC Center Side Break Disconnect Switch”.
Johnson Manufacturing Company, “Type M Center Break Switch” (pub. date not shown).
Siemens-Allis, DS 1.3a, Jul., 1979, “Group Operated Switches”.
Westinghouse, supplement to descriptive bulletin 36-250, “outdoor disconnecting switches type CB center side break”, Dec., 1962.

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