US3609383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid-operated starting motor
Assignee: Caterpillar Inc
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Filing: 1970-09-18
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Granted: 1971-09-28
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Expires: 1990-09-18
Abstract
Abstract In a solenoid circuit for a staring motor, a solenoid has both a pull-in coil and a hold-in coil for positioning an armature to effect engagement and disengagement of the starting motor with an engine. Shifting of the armature also closes a parallel circuit between an electrical source and the starting motor. A diode is arranged in series with one end of the pull-in coil to prevent reverse current flow through the pull-in coil and the development of a magnetomotive force therein counter to force developed by the hold-in coil.
Inventors
- 👤 James P Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
F; F02; F02N; F02N11/00; F02N11/08; F02N11/0851
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
A solenoid circuit for a starting motor, the solenoid having a pull-in coil and a hold-in coil, both coils being operatively coupled with a solenoid armature which is effective to shift a pinion mechanism for accomplishing positive engagement and disengagement of the starting motor with a gear component of an engine in response to energization of the coils by electrical source means and switch means, the armature also being arranged for providing electrical continuity between two contact points electrically arranged in parallel with the switch means and solenoid coils for energizing the motor by the electrical source means, the circuit comprising a series connection between the source and one end of each coil through the switch, parallel connecting means between the opposite ends of the coils and the source, a diode being in series communication with the other end of the pull-in coil to prevent reverse current flow through the pull-in coil and the development of a magnetomotive force in the pull-in coil counter to the magnetomotive force of the hold-in coil which maintains the shifted position of the armature for operation of the starting motor.
Claim 2
Dependent Claim
186 words
A solenoid circuit for a starting motor, the solenoid having a pull-in coil and a hold-in coil, both coils being operatively coupled with a solenoid armature which is effective to shift a pinion mechanism for accomplishing positive engagement and disengagement of the starting motor with a gear component of an engine in response to energization of the coils by electrical source means and switch means, the armature also being arranged for providing electrical continuity between two contact points electrically arranged in parallel with the switch means and solenoid coils for energizing the motor by the electrical source means, the circuit comprising a series connection between the source and one end of each coil through the switch, parallel connecting means between the opposite ends of the coils and the source, a diode being in series communication with the other end of the pull-in coil to prevent reverse current flow through the pull-in coil and the development of a magnetomotive force in the pull-in coil counter to the magnetomotive force of the hold-in coil which maintains the shifted position of the armature for operation of the starting motor.
Claim 3
Dependent Claim
236 words
A solenoid circuit for a starting motor, the solenoid having a pull-in coil and a hold-in coil, both coils being operatively coupled with a solenoid armature which is effective to shift a pinion mechanism for accomplishing positive engagement and disengagement of the starting motor with a gear component of an engine in response to energization of the coils by electrical source means and switch means, the armature also being arranged for positioning a movable contact plate to provide electrical continuity between two contact points for operatively coupling the source with the starting motor, the circuit comprising a series connection between the source and one end of each coil through the switch, a connection between the source and one of the contacts, a series connection between the other end of the pull-in coil and the source through the other contact and the starting motor, a connection between the other end of the hold-in coil and the source in parallel with the series connection for the other end of the pull-in coil, the other contact and the motor and a diode arranged in the series connection for the other end of the pull-in coil to prevent reverse current flow through the pull-in coil and the development of a magnetomotive forCe in the pull-in coil in opposition to a magnetomotive force in the hold-in coil which maintains the shifted position of the armature for operation of the starting motor.
Claim 4
Dependent Claim
236 words
A solenoid circuit for a starting motor, the solenoid having a pull-in coil and a hold-in coil, both coils being operatively coupled with a solenoid armature which is effective to shift a pinion mechanism for accomplishing positive engagement and disengagement of the starting motor with a gear component of an engine in response to energization of the coils by electrical source means and switch means, the armature also being arranged for positioning a movable contact plate to provide electrical continuity between two contact points for operatively coupling the source with the starting motor, the circuit comprising a series connection between the source and one end of each coil through the switch, a connection between the source and one of the contacts, a series connection between the other end of the pull-in coil and the source through the other contact and the starting motor, a connection between the other end of the hold-in coil and the source in parallel with the series connection for the other end of the pull-in coil, the other contact and the motor and a diode arranged in the series connection for the other end of the pull-in coil to prevent reverse current flow through the pull-in coil and the development of a magnetomotive forCe in the pull-in coil in opposition to a magnetomotive force in the hold-in coil which maintains the shifted position of the armature for operation of the starting motor.
Claim 5
Dependent Claim
26 words
The circuit of claim 2 wherein the diode is arranged in the series connection between the other end of the pull-in coil and the other contact.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |