Time demand counter

Details Time demand counter Time demand counter

Filed on

1988-02-08

Date issued

1990-04-24

Examiner

Heyman, John S.

Patent Class

Electrical pulse counters, pulse dividers, or shift registers: c

SubClass

Applications

SubSubClass

Determining machine or apparatus operating time or...

Other Related Categories

377 15, 377 20, 368 8, G07C 502, G07C 302

Type

Patent

Status

active

Patent number

049205498

Description

ABSTRACT:
A Time Demand Counter permits a sensor to be mechanically coupled, by quick connect/disconnect means, to the power feed line of a monitored device with little disruption of the power feed circuitry. The sensor is nonloading in that essentially no energy is drawn from the monitored device's feed line to power the Time Demand Counter. Unlike current transformers previously used, the sensor does not have to be varied to complement the current drawn by the monitored device. A long useful battery life is assured for internally powered embodiments of the invention. Also, since the invention accumulates the record of ON/OFF cycles, as well as the total accumulated demand time, the average time the monitored device is used each time demand is placed on it can be readily determined.

REFERENCES:
patent: 3548165 (1970-12-01), Linnenkamp
patent: 3729620 (1973-04-01), Jones
patent: 4023015 (1977-05-01), Garcia
patent: 4237371 (1980-12-01), Le Bouder
patent: 4237374 (1980-12-01), Malone
patent: 4262842 (1981-04-01), Grover et al.
patent: 4630292 (1986-12-01), Juricich et al.

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