Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1995-08-22
1997-01-14
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
200 6BB, 200 11G, 200241, 200266, 200569, H01H 1960, H01H 2180, H01H 100
Patent
active
055942202
ABSTRACT:
In a rotary switch, a manually rotatable shaft turns a disk which has a plurality of riser cam segments on one of its faces. Stepwise rotation of the disk causes the cam segments to press down on flat spring contacts arranged in the switch to put the tip of one of the contacts at a time into contact with a stationary electrical contact bar that is coated with a noble metal. The spring contacts are configured such that when pressed by a cam the tips are caused to make contact with the stationary contact bar and then slide longitudinally so as the tip will pick up some of the noble metal coating from the contact bar. The tips are shaped with a traverse curve intersecting a longitudinal groove to thereby produce two points that make high unit stress contact with the stationary contact bar.
REFERENCES:
patent: 2525408 (1950-10-01), Graybill et al.
patent: 3569654 (1971-03-01), Murakami
patent: 3725624 (1973-04-01), Emmons
patent: 3731032 (1973-05-01), Schantz
patent: 3971904 (1976-07-01), Ward
patent: 4059738 (1977-11-01), Mongeau
patent: 4133990 (1979-01-01), Wanner et al.
patent: 4272658 (1981-06-01), Crosby
Hackbarth David G.
Hapke Kenyon A.
Schantz Spencer C.
Scott J. R.
US Controls Corp.
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