US3948039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hour meter operated responsive to tachometer signal
Assignee: Deutz Allis Corp
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Filing: 1974-12-24
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Granted: 1976-04-06
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Expires: 1994-12-24
Abstract
Abstract An hour meter on a tractor for registering the operating time of the tractor connected for receiving a tachometer signal to energize the hour meter circuit and thereby register the time of engine operation of the vehicle responsive to actual operating time of the engine.
Inventors
- 👤 James E. Leveraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:44
CPC Classifications
G; G07; G07C; G07C5/00; G07C5/02; G07C5/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
An hour meter circuit for operating an hour meter on a vehicle comprising, an oscillator circuit, a rectifying circuit connected to said oscillator circuit for energizing said oscillator circuit, an engine driven signal generator generating an electrical signal applied to said rectifier circuit, an electronic switching circuit triggered by said oscillator circuit, an hour meter, a solenoid intermittently energized by said electronic switching circuit, a solenoid operated counter, an hour meter connected to said counter, a source of electrical energy supplying electrical energy to said solenoid and said electronic switching circuit thereby providing an hour meter operating only when said engine driven signal generator is operating.
Claim 2
Dependent Claim
106 words
An hour meter circuit for operating an hour meter on a vehicle comprising, an oscillator circuit, a rectifying circuit connected to said oscillator circuit for energizing said oscillator circuit, an engine driven signal generator generating an electrical signal applied to said rectifier circuit, an electronic switching circuit triggered by said oscillator circuit, an hour meter, a solenoid intermittently energized by said electronic switching circuit, a solenoid operated counter, an hour meter connected to said counter, a source of electrical energy supplying electrical energy to said solenoid and said electronic switching circuit thereby providing an hour meter operating only when said engine driven signal generator is operating.
Claim 3
Dependent Claim
25 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 wherein said signal generator defines an alternator.
Claim 4
Dependent Claim
38 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 including a circuit for operating a tachometer, means applying said electrical signal to said tachometer circuit and said rectifier circuit.
Claim 5
Dependent Claim
38 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 wherein said source of electrical energy for operating said solenoid and switching circuit defines a battery and an electrical switch.
Claim 6
Dependent Claim
37 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 including a safety zener diode connected across said switching circuit for providing a safety circuit for said switching circuit.
Claim 7
Dependent Claim
45 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 including a tachometer circuit for energizing a tachometer, a terminal connected to the input of said tachometer circuit and connected to the input of said rectifier circuit.
Claim 8
Dependent Claim
33 words
An hour meter circuit for operating as an hour meter on a vehicle as set forth in claim 1 including, a variable resistor for controlling the frequency of oscillation of said oscillator circuit.
Claim 9
Dependent Claim
34 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 including a resistance capacitance discharge time control for controlling the frequency of oscillation of said oscillator.
Claim 10
Dependent Claim
34 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 wherein said oscillator circuit includes a unijunction oscillator for controlling the triggering of said switching circuit.
Claim 11
Dependent Claim
41 words
An hour meter circuit for operating an hour meter on a vehicle as set forth in claim 1 including a mechanical counter, an armature in said solenoid connected to said mechanical counter for registering engine running time on said hour meter.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |