Title: Circuit breaker with automatically adjustable contact pressure

Abstract: A switch or circuit breaker that provides a high contact pressure when closed and provides a reduced and automatically regulated contact pressure during opening and closing. In one embodiment a pair of contacts is mounted opposite one another and one of the contacts is carried at one end of a pivotably mounted lever so that it can move towards and away from the other by a movement of the other end of the lever. A fluid operated cylinder arrangement is provided to move the switch blade from a first disengaged position to a second engaged position between the blades. The cylinder is mounted on a mechanical linkage so that the linkage is deflected in accordance with the resistance of the blade to movement, and the deflection of the linkage moves the lever tending to decrease contact pressure. A balance is reached between contact pressure and the blade movement tending to maintain a constant and reduced contact pressure during opening and closing.

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Inventors: Olafsen, Karl D. (Mosby, NO)

Application Number: 586764
Filing Date: 1975-06-13
Publication_date: 1976-08-10
Assignee: Falconbridge Nickel Mines Limited (Toronto, CA)
Primary Class(es): 200/82R 200/260, 200/337
Other Classes:
US Patent Ref:

2972337	Feb, 1961	Coggeshall	200/82.
3062934	Nov, 1962	Nijland	200/82.
3137778	Jun, 1964	Barr	200/255.

Other Refs: 389,063

Jun, 1965	CH

Primary Examiner: Tolin, Gerald P.
Assistant Examiner:
Attorney: Hicks; Richard J.