Horology: time measuring systems or devices – Controlled by a disparate device – Vehicle or vehicle part
Patent
1981-11-09
1984-10-23
Roskoski, Bernard
Horology: time measuring systems or devices
Controlled by a disparate device
Vehicle or vehicle part
368 9, 340 52R, 340 52F, G04F 800
Patent
active
044785216
ABSTRACT:
A digital time meter for use in a vehicle or other motorized equipment for sensing, accumulating, displaying and retaining the total time a monitored signal from the vehicle or the equipment is present employs a crystal oscillator time base to time the monitored signal. The meter uses integrated circuits to count pulses emanating from the time base in order to accumulate the total time the monitored signal is present. These integrated circuits also have decoder/driver circuitry with multiplexing capabilities to operate a digital display. Power to operate the meter is obtained from the monitored signal when said signal is present, and a replaceable internal battery when said signal is absent. The battery can be replaced without affecting the timing and accumulating functions of the meter provided the monitored signal is present. When the monitored signal is absent, a display switching circuit disables the display to prolong battery life. The meter can retain the accumulated time for several years on battery power alone. The digital display can be detached from the meter to prevent unauthorized reading of the display and to protect the display from physical damage.
REFERENCES:
patent: 3965669 (1976-06-01), Larson et al.
patent: 4022017 (1977-05-01), Aoki et al.
patent: 4340945 (1982-07-01), Gothe
Ellis John F.
Evans Dennis W.
Perfection Electronic Products Corp.
Roskoski Bernard
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