US3573609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributor advance tester with tachometer
Assignee: LAC DU FLAMBEAU BAND OF LAKE SUPERIOR CHIPPEWA INDIANS
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Filing: 1969-02-27
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Granted: 1971-04-06
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Expires: 1989-02-27
Abstract
Abstract A hand held timing advance tester and tachometer construction for internal combustion engines which includes a source of stroboscopic light and an instrument displaying a first scale for measuring engine speed and a second scale for measuring engine advance. Each time the selected cylinder fires, a flash tube is energized. A time delay circuit will either trigger the flash tube energizing circuit immediately in response to each high voltage pulse applied at the input or will trigger it after a time delay, which is continuously and selectively variable by means of a manual control. The time delay circuit also applies a signal to the indicator, which provides a visual indication of the amount of delay provided by the time delay circuit.
Inventors
- 👤 John L Vaher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:26
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/02; F02P17/04; F02P17/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
253 words
A hand-held timing advance tester and engine speed reading construction comprising a barrel portion and a handle portion, a stroboscopic light source attached at one end of said barrel, an electric current meter at the other end of said barrel having a face with first and second scales, one of said scales displaying degrees of engine advance, and the other scale displaying engine speed units, an inductive pickup means extending from said construction for connection with an ignition wire, manually variable control means for said construction, a monostable multivibrator circuit, means connecting said inductive pickup means to trigger said monostable multivibrator circuit to its unstable state, means connecting said monostable multivibrator circuit to actuate said stroboscopic light when said monostable multivibrator circuit returns to its stable state, means connecting said monostable multivibrator circuit to said meter to apply a substantially constant current to said meter whenever said circuit is in its unstable state, said monostable multivibrator circuit including time delay means having a variable resistor controlled by said control means to permit manual adjustment of the period of said monostable multivibrator during a measurement of the timing advance of an engine, a fixed value resistor and switch means operated by said control means to adapt said construction for measurement of the speed of an engine, said switch means being operative to connect said fixed value resistor in place of said variable resistor in said time delay means so that said monostable multivibrator circuit has a predetermined, fixed period during an engine speed measurement.
Claim 2
Dependent Claim
253 words
A hand-held timing advance tester and engine speed reading construction comprising a barrel portion and a handle portion, a stroboscopic light source attached at one end of said barrel, an electric current meter at the other end of said barrel having a face with first and second scales, one of said scales displaying degrees of engine advance, and the other scale displaying engine speed units, an inductive pickup means extending from said construction for connection with an ignition wire, manually variable control means for said construction, a monostable multivibrator circuit, means connecting said inductive pickup means to trigger said monostable multivibrator circuit to its unstable state, means connecting said monostable multivibrator circuit to actuate said stroboscopic light when said monostable multivibrator circuit returns to its stable state, means connecting said monostable multivibrator circuit to said meter to apply a substantially constant current to said meter whenever said circuit is in its unstable state, said monostable multivibrator circuit including time delay means having a variable resistor controlled by said control means to permit manual adjustment of the period of said monostable multivibrator during a measurement of the timing advance of an engine, a fixed value resistor and switch means operated by said control means to adapt said construction for measurement of the speed of an engine, said switch means being operative to connect said fixed value resistor in place of said variable resistor in said time delay means so that said monostable multivibrator circuit has a predetermined, fixed period during an engine speed measurement.
Claim 3
Dependent Claim
30 words
A construction in accordance with claim 1 including selectively operable means to permit actuation of said stroboscopic light substantially simultaneously with production of a signal by said inductive pickup means.
Claim 4
Dependent Claim
38 words
A construction in accordance with claim 1 wherein said electric current meter comprises an edgewise mounted instrument, and including a horizontally disposed rectangular opening at said other end of said barrel for viewing the scales on said instrument.
Claim 5
Dependent Claim
27 words
A construction in accordance with claim 1 wherein said control means comprises a rotatably mounted finger actuated knob located adjacent the intersection of said barrel and handle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |