US3693073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple function testing device for internal combustion engine
Assignee: Orbit Lab Inc
•
Filing: 1970-10-23
•
Granted: 1972-09-19
•
Expires: 1990-10-23
Abstract
Abstract A multiple function device has three circuits with a common control. One circuit is an oscillator which charges a condenser that is discharged through a gaseous discharge lamp by the sparking of a spark plug to give a stroboscopic timing light; one circuit is an ohmmeter which averages the values of voltage for dwell time and open circuit time to give percentage of cam dwell; and another circuit is an averaging meter which provides a voltage that is proportional to the number of times that the breaker points open. In the latter two instances the meter is calibrated with scales that read dwell time and R.P.M. directly.
Inventors
- 👤 Michael Colette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:08
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/34; F; F02; F02P; F02P17/00; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/4807
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
337 words
Apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell and R.P.M., said apparatus comprising: a cam dwell measuring means and a tachometer means, both said means each having an input terminal for connection to the distributor of the engine, an output terminal for connection to the engine ground, a single meter circuit means connected between both said cam dwell measuring means and said tachometer means and said output terminal said cam dwelling measuring means including first circuit means connected to said meter circuit means to supply thereto a signal proportional to the percentage of time that the engine breaker points are open circuit; said tachometer means including second circuit means connected to said meter circuit means to supply thereto a signal proportional to the number of times that the braker points open per unit time; said first and second circuit means being connected within said apparatus to operate substantially independent of each other; and an engine timing light circuit having a first terminal for connection to the positive battery terminal of the engine, for supplying exclusive d.c. power to said timing light circuit, a second terminal for connection to a spark plug of the engine, a lamp to be periodically ignited by said timing light circuit, first coupling means coupling said lamp across said first and output terminals and for applying to said lamp pulsed d.c. energy of relatively high frequency and of a value below the ignition point of said lamp, second coupling means, including voltage dropping means for protection of the entire apparatus, connected to said second terminal and capacitively coupled to said lamp for supplying pulsed energy of sufficient magnitude in combination with the said high frequency value to ignite said lamp in synchronism with the firing of a spark plug; a test lead for connection to one of the engine positive battery terminal and the distributor of the engine and manual switching means for sequential connection of any one of said input and first terminals to said test lead.
Claim 2
Dependent Claim
337 words
Apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell and R.P.M., said apparatus comprising: a cam dwell measuring means and a tachometer means, both said means each having an input terminal for connection to the distributor of the engine, an output terminal for connection to the engine ground, a single meter circuit means connected between both said cam dwell measuring means and said tachometer means and said output terminal said cam dwelling measuring means including first circuit means connected to said meter circuit means to supply thereto a signal proportional to the percentage of time that the engine breaker points are open circuit; said tachometer means including second circuit means connected to said meter circuit means to supply thereto a signal proportional to the number of times that the braker points open per unit time; said first and second circuit means being connected within said apparatus to operate substantially independent of each other; and an engine timing light circuit having a first terminal for connection to the positive battery terminal of the engine, for supplying exclusive d.c. power to said timing light circuit, a second terminal for connection to a spark plug of the engine, a lamp to be periodically ignited by said timing light circuit, first coupling means coupling said lamp across said first and output terminals and for applying to said lamp pulsed d.c. energy of relatively high frequency and of a value below the ignition point of said lamp, second coupling means, including voltage dropping means for protection of the entire apparatus, connected to said second terminal and capacitively coupled to said lamp for supplying pulsed energy of sufficient magnitude in combination with the said high frequency value to ignite said lamp in synchronism with the firing of a spark plug; a test lead for connection to one of the engine positive battery terminal and the distributor of the engine and manual switching means for sequential connection of any one of said input and first terminals to said test lead.
Claim 3
Dependent Claim
49 words
Apparatus according to claim 1 in which said first coupling means of said timing light circuit includes an oscillator consisting of a transformer with primary and secondary windings and an electronic switch connected to both windings and turned on and off by pulsed d.c. signals from said secondary winding.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 2 in which said electronic switch consists of a transistor having its base connected to one end of said secondary winding and its emitter connected to one end of said primary winding.
Claim 5
Dependent Claim
51 words
Apparatus according to claim 1 in which said first circuit means of said cam dwell measuring means comprises resistive means in series between said input terminal and one side of said meter circuit means, and there further is provided voltage regulator means connected between said test lead and said output terminals.
Claim 6
Dependent Claim
43 words
Apparatus according to claim 4 in which said second circuit means of said tachometer means comprises a differentiating circuit connected to said input terminal and an integrating circuit connected to said meter circuit means and responsive to the output from said differentiating circuit.
Claim 7
Dependent Claim
49 words
Apparatus according to claim 5 in which said first coupling means of said timing light circuit includes an oscillator consisting of a transformer with primary and secondary windings and an electronic switch connected to both windings and turned on and off by pulsed d.c. signals from said secondary winding.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 6 in which said electronic switch consists of a transistor having its base conneCted to one end of said secondary winding and its emitter connected to one end of said primary winding.
Claim 9
Dependent Claim
43 words
Apparatus according to claim 1 in which said second circuit means of said tachometer means comprises a differentiating circuit connected to said input terminal and an integrating circuit connected to said meter circuit means and responsive to the output from said differentiating circuit.
Claim 10
Dependent Claim
49 words
Apparatus according to claim 8 in which said first coupling means of said timing light circuit includes an oscillator consisting of a transformer with primary and secondary windings and an electronic switch connected to both windings and turned on and off by pulsed d.c. signals from said secondary winding.
Claim 11
Dependent Claim
51 words
Apparatus according to claim 9 in which said first circuit means of said cam dwell measuring means comprises resistive means in series between said input terminal and one side of said meter circuit means, and there further is provided voltage regulator means connected between said test lead and said output terminals.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |