Actual operating time indicator

Details Actual operating time indicator Actual operating time indicator

1993-03-01

1994-07-12

Black, Thomas G.

Boots, shoes, and leggings

318603, 318569, 377 16, 34082565, 324 7647, G04F 500

Patent

active

053294688

ABSTRACT:
An actual operating time indicator includes: a lifting motor for lifting a load up/down; a power detection unit for detecting an input power based on a current and a voltage supplied to the motor, and converting the input power into a first voltage proportional to the input power; a voltage-to-periodic pulse conversion unit connected to the power detection unit for receiving the first voltage and converting the first voltage into the periodic pulse proportional to the first voltage; a counter unit connected to the voltage-to-periodic pulse conversion unit for counting and integrating the periodic pulse to obtain an integrated power; and a display operatively connected to the counter unit for indicating the integrated power as an actual operating time of the motor.

REFERENCES:
patent: 4027470 (1977-06-01), Friedman
patent: 4425538 (1984-01-01), Berney
patent: 4593237 (1986-06-01), Tanaka
patent: 4870351 (1989-09-01), Milkovic

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