Hourmeter-tachometer

Details Hourmeter-tachometer Hourmeter-tachometer

1978-07-03

1980-01-01

Corcoran, Robert J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

364565, 58146, 58152E, G01P 348, G04F 800, G07C 302

Patent

active

041818830

ABSTRACT:
A digital hourmeter-tachometer for use with internal combustion engines or the like comprises a programmable timer for outputting system timing pulses when a d.c. power source is applied thereto. A pick-up pulse circuit generates pulses indicative of the angular speed of the device being monitored and outputs d.c. power to the remainder of the hourmeter-tachometer. A first multiple decade counter counts hour pulses outputted by the timer. A second multiple decade counter counts pulses indicative of angular speed. Display means sequentially display the output of the stored count in the first and second multiple decade counters in response to system timing pulses. A long-life battery applies a direct current to the first counter when the pulses are not received by the pick-up circuit for providing a d.c. source thereby holding the hour count. Preferably, an overspeed shut-down circuit is integrated with the above described circuit.

REFERENCES:
patent: 3636545 (1972-01-01), Boyd et al.
patent: 3748580 (1973-07-01), Stevens et al.
patent: 3965669 (1976-06-01), Larson et al.
patent: 4056778 (1977-11-01), Randazzo

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