Timer circuit

Details Timer circuit Timer circuit

1983-07-22

1985-11-26

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

219203, 219492, H01H 4718

Patent

active

045557438

ABSTRACT:
A timer circuit suitable for operating, for a required period of time, the windshield defrosting heater in an automobile, comprises a switch operative only in one direction, such as a momentary unidirection switch, a timer which starts timing operation after a lapse of a predetermined time, and a flip-flop circuit or the like. The switch allows setting and cancelling for timing operation, whereby the operative characteristics are improved and the mechanical design is simplified. Moreover, the use of a flip-flop circuit reduces the occurrence of chattering.

REFERENCES:
patent: 3858027 (1974-12-01), Phillips
patent: 3894247 (1975-07-01), DeJong
patent: 3898423 (1975-08-01), Taylor et al.
patent: 3944893 (1976-03-01), Hayden
patent: 3973140 (1976-08-01), Phillips
patent: 4424438 (1984-01-01), Antelman et al.

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