Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1978-10-10
1979-11-20
Marcus, Stephen
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 16C, 200 6188, H01H 136, H01H 1506
Patent
active
041752236
ABSTRACT:
The plastic non-conducting housing is provided with two pairs of terminals the inner ends of which serve as busses and fit in grooves in the interior, each pair being separated by an integral rib which is slightly higher than the busses so the associated spring loaded roller-like shorting bar mounted in the axially moveable carrier is held out of contact with the busses. The molded housing is cored along the length of the rib where switching is desired. Therefore, where the housing is cored there is no rib to prevent the shorting bar from completing the circuit between the busses. When the shorting bar engages the busses the friction between the loading spring and the knurled central section of the roller is greater than the friction between the roller and the busses so the roller slides on the busses to obtain "wipe". When the roller engages the rib the friction between the roller and rib is greater than between the roller and spring so the roller rolls and will present a new surface to the busses on the next operation. The carrier is spring loaded to project out of the housing and is moved inwardly in response to the position of an external mechanism.
REFERENCES:
patent: 3187119 (1965-06-01), Dyksterhouse
patent: 3423549 (1969-01-01), Sondej
patent: 3461256 (1969-08-01), Ferryman, Jr.
patent: 3940580 (1976-02-01), Williams et al.
patent: 4079220 (1978-03-01), Wagner et al.
Lauritsen Richard L.
Philbrick Richard S.
Marcus Stephen
The Singer Company
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