Patent US3761731A successfully refreshed from Google Patents.
US3761731A
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US
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Motor vehicle magnetic gauge circuitry with time delay switching
Assignee: Ford Motor Co
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Filing: 1972-05-22
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Granted: 1973-09-25
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Expires: 1992-05-22
Abstract
Abstract Motor vehicle magnetic gauge circuitry is described. The circuitry includes a source of electrical energy, a vehicle ignition switch, time delay switching means, and a magnetic gauge having a plurality of electrical coils. The circuitry may be used to indicate engine oil pressure or temperature or other physical condition. The time delay switching means provides zeroing of the magnetic gauge after the ignition switch is opened and may be used to simulate physical conditions occurring subsequent to the opening of the ignition switch. Preferably, the time delay switching means is a thermal relay.
Inventors
- 👤 J Burgett
- 👤 L Vanderberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:13
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; F; F01; F01M; F01M11/00; F01M11/10; G01R; G01R5/00; G01R5/14; G01R5/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
Magnetic gauge circuitry for a motor vehicle having an ignition switch, said ignition switch having open and closed conditions, which comprises: a source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; a switching device interposed between said source of electrical energy and at least one of said magnetic gauge coils to control current flow from said source of electrical energy to said at least one of said magnetic gauge coils, said switching device having open and closed conditions; and means for delaying for a predetermined time the change of said switching device from its closed condition to its open condition following the change of said ignition switch from its closed condition to its open condition.
Claim 2
Dependent Claim
130 words
Magnetic gauge circuitry for a motor vehicle having an ignition switch, said ignition switch having open and closed conditions, which comprises: a source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; a switching device interposed between said source of electrical energy and at least one of said magnetic gauge coils to control current flow from said source of electrical energy to said at least one of said magnetic gauge coils, said switching device having open and closed conditions; and means for delaying for a predetermined time the change of said switching device from its closed condition to its open condition following the change of said ignition switch from its closed condition to its open condition.
Claim 3
Dependent Claim
50 words
Magnetic gauge circuitry in accordance with claim 1, wherein said means further includes the function of delaying for a predetermined time the change of said switching device from its open condition to its closed condition following the change of said ignition switch from its open condition to its closed condition.
Claim 4
Dependent Claim
21 words
Magnetic gauge circuitry in accordance with claim 1, wherein said switching device and said delaying means comprises a time delay relay.
Claim 5
Dependent Claim
59 words
Magnetic gauge circuitry in accordance with claim 2, wherein said switching device, said means for delaying for a predetermined time the change of said switching device from its closed condition to its open condition, and for delaying for a predetermined time the change of said switching device from its open condition to its closed condition comprises a thermal relay.
Claim 6
Dependent Claim
103 words
Magnetic gauge circuitry for a motor vehicle having an ignition switch, which comprises: a source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; a pair of switch contacts connected in series with at least one of said gauge electrical coils; and means coupled to said ignition switch for opening, after a time delay, said pair of switch contacts in response to the opening of said ignition switch and for closing, after a time delay, said pair of switch contacts in response to the closing of said ignition switch.
Claim 7
Dependent Claim
103 words
Magnetic gauge circuitry for a motor vehicle having an ignition switch, which comprises: a source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; a pair of switch contacts connected in series with at least one of said gauge electrical coils; and means coupled to said ignition switch for opening, after a time delay, said pair of switch contacts in response to the opening of said ignition switch and for closing, after a time delay, said pair of switch contacts in response to the closing of said ignition switch.
Claim 8
Dependent Claim
36 words
Magnetic gauge circuitry in accordance with claim 5, wherein said means for opening and closing said pair of switch contacts comprises a relay, said relay having both time delay after energization and time delay after de-energization.
Claim 9
Dependent Claim
15 words
Magnetic gauge circuitry in accordance with claim 6, wherein said relay is a thermal relay.
Claim 10
Dependent Claim
100 words
Magnetic gauge circuitry for indicating the temperature of the engine of a motor vehicle, said circuitry comprising: a source of electrical energy; an ignition switch connected to said source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; and means for supplying electrical current to less than all of said gauge coils immediately upon closure of said ignition switch and, after a time delay, for supplying current to all of said coils, thereby, to indicate the operability of said gauge and the temperature of said engine.
Claim 11
Dependent Claim
100 words
Magnetic gauge circuitry for indicating the temperature of the engine of a motor vehicle, said circuitry comprising: a source of electrical energy; an ignition switch connected to said source of electrical energy; a magnetic gauge having a plurality of electrical coils and having indicating means responsive to electrical current in said coils; and means for supplying electrical current to less than all of said gauge coils immediately upon closure of said ignition switch and, after a time delay, for supplying current to all of said coils, thereby, to indicate the operability of said gauge and the temperature of said engine.
References Cited (Backward Citations)
US2339021A
Cited
US3601793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |