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US3783301A
Expired / Lapsed
US
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Lockout circuit for engine starter system
Assignee: Caterpillar Inc
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Filing: 1972-06-08
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Granted: 1974-01-01
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Expires: 1992-06-08
Abstract
Abstract The risk of damage to starter mechanism for cranking an engine is reduced by a simple and reliable lockout circuit which prevents re-energization of the starter system from inadvertent closing of the starter switch after the engine is running. The lockout circuit detects when the engine has started by sensing engine oil pressure but does not deactivate the starter system until such time as the operator releases the starter switch. Thereafter the starter system cannot be re-energized until after the engine has been shutdown. All electrical elements of the lockout circuit are de-energized during running of the engine after the starter switch is released.
Inventors
- 👤 R Nieukirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:39
CPC Classifications
F; F02; F02N; F02N11/00; F02N11/10; F02N11/101; F02N11/105
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
In a starter system for an engine having electrically operated engine cranking means and a source of electrical power therefor and having a normally open starter switch connected between said power source and said cranking means for selectively energizing said cranking means to start said engine, a lockout circuit comprising: a switching device connected between said power source and said engine cranking means in series relationship with said starter switch to form part of the power path through which electrical energization is supplied to said cranking means from said power source, said switching device being of the form which is normally non-conductive and which is triggered into conduction by application of an electrical gating signal to a gate terminal thereof and which then remains conductive until current flow through said switching device is interrupted, and a gating signal switch having normally closed contacts connected between said gating terminal and said power source through said starter switch, said gating signal switch having means for opening said contacts when said enging is running.
Claim 2
Dependent Claim
171 words
In a starter system for an engine having electrically operated engine cranking means and a source of electrical power therefor and having a normally open starter switch connected between said power source and said cranking means for selectively energizing said cranking means to start said engine, a lockout circuit comprising: a switching device connected between said power source and said engine cranking means in series relationship with said starter switch to form part of the power path through which electrical energization is supplied to said cranking means from said power source, said switching device being of the form which is normally non-conductive and which is triggered into conduction by application of an electrical gating signal to a gate terminal thereof and which then remains conductive until current flow through said switching device is interrupted, and a gating signal switch having normally closed contacts connected between said gating terminal and said power source through said starter switch, said gating signal switch having means for opening said contacts when said enging is running.
Claim 3
Dependent Claim
34 words
The combination defined in claim 1 wherein said switching device is a silicon controlled rectifier and wherein said gating signal switch is a fluid pressure operated switch responsivE to oil pressure from said engine.
Claim 4
Dependent Claim
224 words
A starter system for an engine having a ring gear which is turned to start said engine and having an oil pump, comprising, battery means, an electrical starter motor, a set of normally open electrical contacts connected across said battery means in series with said starter motor, a pinion gear coupled to said motor for rotation thereby and being movable into engagement with said ring gear of said engine, solenoid means which may be electrically energized and having means for shifting said pinion gear into engagement with said ring gear and for closing said normally open contacts to energize said motor in response to said energization, a normally open manually operable starter switch, a solid-state switching means connected to said battery means in series relationship with said starter switch and said solenoid means and having a gate terminal for receiving an electrical signal which initiates conduction through said switching means to provide current therethrough for energizing said solenoid means, said switching means being of the form which remains conductive until current flow therethrough is stopped, and a normally closed fluid pressure actuated switch connected between said battery means and said gate terminal of said switching means through said starter switch and having a fluid pressure input coupled to said oil pump of said engine to be opened by fluid pressure from said oil pump.
Claim 5
Dependent Claim
224 words
A starter system for an engine having a ring gear which is turned to start said engine and having an oil pump, comprising, battery means, an electrical starter motor, a set of normally open electrical contacts connected across said battery means in series with said starter motor, a pinion gear coupled to said motor for rotation thereby and being movable into engagement with said ring gear of said engine, solenoid means which may be electrically energized and having means for shifting said pinion gear into engagement with said ring gear and for closing said normally open contacts to energize said motor in response to said energization, a normally open manually operable starter switch, a solid-state switching means connected to said battery means in series relationship with said starter switch and said solenoid means and having a gate terminal for receiving an electrical signal which initiates conduction through said switching means to provide current therethrough for energizing said solenoid means, said switching means being of the form which remains conductive until current flow therethrough is stopped, and a normally closed fluid pressure actuated switch connected between said battery means and said gate terminal of said switching means through said starter switch and having a fluid pressure input coupled to said oil pump of said engine to be opened by fluid pressure from said oil pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |