Tachometer switch

Details Tachometer switch Tachometer switch

1986-10-16

1988-02-02

Recla, Henry J.

Electricity: circuit makers and breakers

Electric switch details

Contact

200336, 200292, 200308, 200 11A, 200 11DA, H01H 116

Patent

active

047230592

ABSTRACT:
An electrical rotary switch includes a single support housing (18) for rotation about a base (12). The base (12) is a circuit board which includes an opening (16) through which the housing (18) is secured to the base. A pair of contact pads (14) extend radially away from the opening (16) on the base (12). The housing (18) includes a cavity (34) facing the base (12). A conductive roller (38) is located in the cavity (34) for rolling over the pair of contact pads (14) to establish an electrical connection. The switch is characterized by a fulcrum ridge (40) extending from the housing (18) into the cavity (34) for allowing the roller (38) to rock in case a bump is incurred in the contact pads (14) to ensure an electrical connection.

REFERENCES:
patent: 2135809 (1938-11-01), Fruth
patent: 2498651 (1950-02-01), Crom
patent: 2817722 (1957-12-01), Johnson
patent: 2834842 (1958-05-01), Le Beau
patent: 3996440 (1976-12-01), Niconienko
patent: 4443670 (1984-04-01), Nakamura et al.

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