Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1981-10-29
1983-10-11
Shepperd, John W.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 68, 200156, 338172, 338198, 338200, H01H 520
Patent
active
044094485
ABSTRACT:
A pull-push switch has one or two stationary contacts and one U-shaped elastic movable contact with two legs which, when not deformed, are adapted to resiliently make into contact with the stationary contacts. A cam is securely mounted on an operating shaft which can be axially shifted between the pulled and pushed positions. The cam has a small-diameter cylindrical portion contiguous with a tapered intermediate portion which in turn is contiguous also with a large-diameter cylindrical portion. The legs of the elastic movable contact are so positioned that they are normally maintained in contact with the peripheral surface of the cam as it is shifted in unison with the operating shaft so that when the shaft is pushed or pulled, the legs of the elastic movable contact rest on the small-diameter cylindrical portion of the cam and subsequently make contact with the stationary contacts, whereby the switch is closed. When the operating shaft is pulled or pushed, the legs of the elastic movable contact ride on the large-diameter cylindrical portion of the cam so that they are forced to bend outward or moved away from each other and from the stationary contacts and consequently the switch is opened.
REFERENCES:
patent: 2453231 (1948-11-01), Kavanagh
patent: 2999991 (1961-09-01), Bender
patent: 3219776 (1965-11-01), Yerkovich
patent: 3236971 (1966-02-01), Cetsworth
patent: 3459913 (1969-08-01), Mutschler et al.
patent: 4339643 (1982-07-01), Murmann
Matsui Hiroshi
Nishioka Matsuo
Onizawa Takashi
Sakami Kazuo
Kidorf Renee S.
Matsushita Electric - Industrial Co., Ltd.
Shepperd John W.
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