US Patent: 4,417,211
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| Apparatus for Determining the Advance of a Timing Light
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Patentees:
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| Patrick E. Ciriacka (exact or similar names) - Carpinteria, CA |
| Gary S. Gibson (exact or similar names) - Evanston, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 06, 1981 |
| Granted: |
Nov. 22, 1983 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Dithmar, Stotland, Stratman & Levy - patent attorneys
Abstract
A first pulse train is generated by a phase-locked loop circuit of which the frequency is adjustable to correspond to engine speeds of between 10 and 9,990 rpm. The pulse train is again divided to furnish a second pulse train for use in firing the timing light. A photoelectric sensor is responsive to flashes from the timing light. A D type flip-flop is coupled to the second pulse train and to the photoelectric sensor and generates an enable signal commencing with a pulse in the second pulse train and terminating with the sensor signal. A counter receives the first pulse train and is operative to count the pulses therein during the presence of the enable signal. A display depicts a number representative of the number of pulses counted by the counter.
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