Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1986-08-26
1987-12-15
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200153G, 200288, H08H 3366
Patent
active
047135034
ABSTRACT:
The velocity of a snap action, spring loaded vacumm switch closing mechanism is substantially reduced by impacting a lever of the mechanism against a first swingable energy absorbing arm which, in turn, pivots to contact a pair of second energy absorbing arms. The pair of second arms are lightweight relative to the first arm and swing through a greater arc than the latter to permit oscillations to subside in remaining components of the switch before rebounding against the first arm. The swingable arms absorb a significant portion of the kinetic energy of the mechanism during closing of the contacts so that shock waves which are normally experienced in various components of the mechanism cannot combine to a value sufficient to snap the mechanism to an open circuit orientation. The anti-bounce device is particularly useful for three phase switchgear wherein a single, common mechanism functions to simultaneously close three pairs of electrical contacts. The closing mechanism has a latching member which cooperates with a latching pin to release the mechanism and close the switch when desired.
REFERENCES:
patent: 3129308 (1964-04-01), Yokoyama et al.
patent: 3163735 (1964-12-01), Miller
patent: 3180960 (1965-04-01), Barkan et al.
patent: 3196231 (1965-07-01), Meyer
patent: 3872273 (1975-03-01), Netzel
patent: 4099039 (1978-07-01), Barkan
patent: 4295024 (1981-10-01), Kamp
patent: 4484046 (1984-11-01), Neuhouser
P. Barkan, "A Study of the Contact Bounce Phenomenon" in IEEE Transactions on Power Apparatus and Systems, vol. PAS-86, No. 2, Feb. 1967, pp. 231-240.
P. Barkan, Chapter 11.4.3, "Contact Bounce", in Physics & Engineering of High Power Switching Devices, by T. H. Lee, pp. 496-503.
A. B. Chance Company
Macon Robert S.
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