US3636451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tachometer circuit for an internal combustion engine or the like
Assignee: Individual
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Filing: 1969-11-12
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Granted: 1972-01-18
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Expires: 1989-11-12
Abstract
Abstract A tachometer wherein the current for the charging capacitor of the tachometer measuring circuit and the current for energizing the coil of the relay switch in the circuit, are from a single source, the tachometer having incorporated in its circuit an arrangement to permit its universal use on four-cycle engines with four, six, or eight cylinders, and having the further provision wherein the capacitor may be charged by the multiple pulsing from the center of low-tension magneto, assuring a sufficient amount of current per unit of time for full zener control. A further improvement in switching provides a similar universal feature on three ratios of two-cycle engines.
Inventors
- 👤 Vivian Luther Westberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:17
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/4807
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
297 words
An improvement in a tachometer circuit including a meter, a relay switch operated by a relay coil to alternately engage contacts to actuate the meter, wherein the improvement comprises a. a pair of terminal connectors for selectively connecting one side of the meter to a positive terminal of an electrical pulsing power source of determined voltage, b. a conductor connected to one of said pair of terminal connectors and connected to one side of the meter 10 and including a diode that permits flow of current through the conductor in the direction of the meter, c. a line connection including a series of bleeding resistors connected in parallel with the other side of the meter and one stationary contact of the relay switch and having a switch for selectively connecting one of the resistors to the meter, d. a second line connection between the other stationary contact of the relay switch and said first-mentioned conductor at a point between the meter and the diode and including a voltage dropping resistor, e. a second conductor connecting one side of the relay coil to said first-mentioned conductor between the diode and the meter and including a zener diode, f. a ground connection for the opposite side of the relay coil, g. a movable contact of the relay switch connected to said first-mentioned conductor and including a capacitor having one side connected to said first-mentioned conductor and an opposite side to the movable contact, h. a filter capacitor connected between said second line connection and said firstmentioned conductor in parallel to said capacitor and said zener diode, i. and a line connection for said other of said pair of terminal connectors including a dropping resistor connected to said first-mentioned conductor between said one of said terminal connectors and said diode.
Claim 2
Dependent Claim
297 words
An improvement in a tachometer circuit including a meter, a relay switch operated by a relay coil to alternately engage contacts to actuate the meter, wherein the improvement comprises a. a pair of terminal connectors for selectively connecting one side of the meter to a positive terminal of an electrical pulsing power source of determined voltage, b. a conductor connected to one of said pair of terminal connectors and connected to one side of the meter 10 and including a diode that permits flow of current through the conductor in the direction of the meter, c. a line connection including a series of bleeding resistors connected in parallel with the other side of the meter and one stationary contact of the relay switch and having a switch for selectively connecting one of the resistors to the meter, d. a second line connection between the other stationary contact of the relay switch and said first-mentioned conductor at a point between the meter and the diode and including a voltage dropping resistor, e. a second conductor connecting one side of the relay coil to said first-mentioned conductor between the diode and the meter and including a zener diode, f. a ground connection for the opposite side of the relay coil, g. a movable contact of the relay switch connected to said first-mentioned conductor and including a capacitor having one side connected to said first-mentioned conductor and an opposite side to the movable contact, h. a filter capacitor connected between said second line connection and said firstmentioned conductor in parallel to said capacitor and said zener diode, i. and a line connection for said other of said pair of terminal connectors including a dropping resistor connected to said first-mentioned conductor between said one of said terminal connectors and said diode.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |