Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1977-11-23
1981-06-02
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144R, 200146R, 200149R, H01H 3308
Patent
active
042713390
ABSTRACT:
A rapid opening and closing interrupter includes a stationary contact mounted in a cylindrical housing and a moving contact mounted on an operating rod by an opening spring. A trailer formed of a material that produces an arc quenching gas when exposed to an arc is mounted on the moving contact, and an engaging nipple is formed on the end of the trailer. A snap spring engages the nipple in such a manner that when the operating rod is moved in a direction to open the contacts, the contacts remain in engagement until the force exerted by the opening spring overcomes the force exerted by the snap spring on the engaging nipple causing the contacts to snap open rapidly. Vent holes are provided in the moving contact so that arc gase, formed during closing by the pre-strike arc, are released from a gas confining area between the moving contact and the trailer through the vent holes so that a net force results against the trailer in the direction of closing thereby causing the moving contact to accelerate towards closing with the stationary contact.
REFERENCES:
patent: 3144536 (1964-08-01), Bridges et al.
patent: 3308259 (1967-03-01), Hulteen et al.
patent: 3542986 (1970-11-01), Kotski
patent: 4008943 (1977-02-01), Flatt et al.
Meister Otto
Tobin Thomas J.
Kaufmann John D.
Macon Robert S.
S&C Electric Company
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