Electrical timing control switch

Details Electrical timing control switch Electrical timing control switch

1982-09-30

1985-02-19

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

315360, 323323, H05B 3702

Patent

active

045007950

ABSTRACT:
An electrical timing circuit for controlling the activation and deactivation of an electrical load by setting a predetermined time period for which the load will be on and for providing one or more short warning periods wherein the load is deactivated prior to the expiration of the predetermined time period. The invention may be used as a switch for a light whereby the light may be actuated to remain on for an hour, but just prior to the expiration of hour period the light will momentarily go off for one or more warning periods prior to the light being turned completely off so that the switch may be reactuated to start another timing period. Momentary switches (12) control a set-reset circuit (16) which sends a signal to a NAND gate (18). A timing circuit (20) is responsive to the momentary switches (12) to provide a plurality of time spaced-signals. A first gate means (22) responds to the timing circuit (20) to provide an input to the summing gate (18) to effectively turn the load off, but only for short warning periods. A second gate means (24) is responsive to both the first gate means (22) and the timing circuit (20) to provide an input to the set-reset circuit (16) to effectively turn the load off at the end of the predetermined period.

REFERENCES:
patent: 3939361 (1976-02-01), Aidala et al.
patent: 4338562 (1982-07-01), Terwilliger

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