Electronic latching circuit for momentary contact switches

Details Electronic latching circuit for momentary contact switches Electronic latching circuit for momentary contact switches

1995-02-02

1996-09-10

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307132R, 307139, 307142, 192 4R, 36442604, 327385, 327392, H01H 708

Patent

active

055548954

ABSTRACT:
A switch circuit for activating and deactivating a motor vehicle cruise control includes a 555 model timer integrated circuit which has a trigger terminal, a reset terminal, a threshold terminal, a control voltage terminal and an output terminal. A substantially constant voltage is applied to the threshold terminal. A first normally-open switch connected between the vehicle ground and the trigger terminal, and a second normally-open switch connected between vehicle ground and the reset terminal. Separate pull-up resistors connect the trigger and reset terminals of the timer to a positive voltage source and a capacitor couples the control voltage terminal to vehicle ground. A relay has a coil connected between the output terminal and vehicle ground, and has a switch that is connected between the common terminal and the ON control terminal of the cruise control. The 555 timer is configured as a latching circuit having an output which toggles in response to operation of the two normally-open switches.

REFERENCES:
patent: 4316395 (1982-02-01), Brown
patent: 4403970 (1983-09-01), Dretzka et al.
patent: 4720763 (1988-01-01), Bauer
patent: 5040407 (1991-08-01), Hinckley et al.
patent: 5051604 (1991-09-01), Hurley
patent: 5065101 (1991-11-01), Ledbetter
patent: 5196731 (1993-03-01), Abe et al.
Signetics 555 Timer Specification, prior to 1987, pp. 1-7.

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