Voltage controlled, variable time delay electronic interval time

Details Voltage controlled, variable time delay electronic interval time Voltage controlled, variable time delay electronic interval time

1983-10-11

1984-12-25

Truhe, J. V.

Electricity: motive power systems

Automatic and/or with time-delay means

Time or with time-delay means

318649, 361189, 361195, 361197, G05D 310, G01C 2118, H01H 4300

Patent

active

044906595

ABSTRACT:
A pair of interval timer units including a lower right timer (LRT) and a lower left timer (LLT) for controlling a pair of D.C. motors (RM, LM) to drive a pair of load devices accurately and consistently a predetermined lowering distance. The load devices are raised together until stopped by limit switches (LS1, LS2) but can be lowered individually under the interval timer (IT) control. Each timer unit (LRT) includes a voltage regulator (ZD1, ZR1) to provide a constant voltage to a ramp voltage generator (RG) and a reference voltage to a voltage inverter (VI). The ramp voltage is applied through a buffer (IC1B) to one input of a comparator (IC1C). The variable supply voltage is also applied to the voltage inverter (VI) that provides a time reference voltage that varies inversely with respect to variation in the supply voltage. This time reference voltage is applied to the comparator (IC1C) upon closure of a "lower" switch to close a motor control switch (Q3) to start the motor time interval and when the ramp voltage rises to the level of the time reference voltage, the comparator (IC1C) opens the motor control switch (Q3) to stop the motor time interval. As a result, since the motor speed changes with change in supply voltage, the interval timer varies inversely the motor operating time for constant load driving distance.

REFERENCES:
patent: 2871419 (1959-01-01), Brosh
patent: 3431471 (1969-03-01), Aviander
patent: 3435298 (1969-03-01), Atkins et al.
patent: 3644793 (1972-02-01), Ilk
patent: 3671817 (1972-06-01), Seipp
patent: 4107588 (1978-08-01), Seiler
patent: 4199808 (1980-04-01), Peterson

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