US3671851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical system for tractor powered by magneto ignition engine
Assignee: Briggs and Stratton Corp
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Filing: 1970-09-09
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Granted: 1972-06-20
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Expires: 1990-09-09
Abstract
Abstract An alternator driven by a magneto ignition engine has separate windings for battery charging and for lights. The battery charging winding is at all times connected with a storage battery through rectifier means and is designed for a maximum engine rpm output that will not harm the battery even when it is fully charged. The lights are normally energized only from the light winding, but switch arrangements are disclosed for energizing the lights from the battery when the engine is not running.
Inventors
- 👤 Joseph R Harkness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:52
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/1438
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
206 words
An electrical system for a riding-type tractor powered by a magneto ignition engine, which electrical system comprises a starter for the engine, a storage battery for energizing the starter, and another electrical load circuit, said electrical system being characterized by: A. an alternator rotor comprising permanent magnet means carried by the flywheel of the engine; B. an alternator stator having 1. means comprising a first winding of impedance high enough to provide for a current output at normal engine speeds which is large enough to provide for a current output at normal engine speeds which is large enough to harm the battery if continuously applied to the battery when it is fully charged, and 2. means comprising a second winding of sufficiently lower impedance to provide for a current output at normal engine speeds which is large enough to energize said other load circuit; C. rectifier means connecting the first winding with the battery so that the battery is supplied with unidirectional current at all times that the engine is running but whereby the battery is prevented from discharging into the first winding when the engine is stopped; and D. circuit means for connecting the second winding with said other load circuit independently of the battery.
Claim 2
Dependent Claim
206 words
An electrical system for a riding-type tractor powered by a magneto ignition engine, which electrical system comprises a starter for the engine, a storage battery for energizing the starter, and another electrical load circuit, said electrical system being characterized by: A. an alternator rotor comprising permanent magnet means carried by the flywheel of the engine; B. an alternator stator having 1. means comprising a first winding of impedance high enough to provide for a current output at normal engine speeds which is large enough to provide for a current output at normal engine speeds which is large enough to harm the battery if continuously applied to the battery when it is fully charged, and 2. means comprising a second winding of sufficiently lower impedance to provide for a current output at normal engine speeds which is large enough to energize said other load circuit; C. rectifier means connecting the first winding with the battery so that the battery is supplied with unidirectional current at all times that the engine is running but whereby the battery is prevented from discharging into the first winding when the engine is stopped; and D. circuit means for connecting the second winding with said other load circuit independently of the battery.
Claim 3
Dependent Claim
91 words
means comprising a second winding of sufficiently lower impedance to provide for a current output at normal engine speeds which is large enough to energize said other load circuit; C. rectifier means connecting the first winding with the battery so that the battery is supplied with unidirectional current at all times that the engine is running but whereby the battery is prevented from discharging into the first winding when the engine is stopped; and D. circuit means for connecting the second winding with said other load circuit independently of the battery.
Claim 4
Dependent Claim
91 words
means comprising a second winding of sufficiently lower impedance to provide for a current output at normal engine speeds which is large enough to energize said other load circuit; C. rectifier means connecting the first winding with the battery so that the battery is supplied with unidirectional current at all times that the engine is running but whereby the battery is prevented from discharging into the first winding when the engine is stopped; and D. circuit means for connecting the second winding with said other load circuit independently of the battery.
Claim 5
Dependent Claim
25 words
The electrical system of claim 1, further characterized by said circuit means comprising: A. a switCh movable selectively to each of three positions and having
Claim 6
Dependent Claim
9 words
second contact means connected with said other load circuit,
Claim 7
Dependent Claim
9 words
second contact means connected with said other load circuit,
Claim 8
Dependent Claim
32 words
in a second position of said switch the first contact means cooperates with the third contact means to connect said other load circuit in an emergency energizing circuit with the battery, and
Claim 9
Dependent Claim
32 words
in a second position of said switch the first contact means cooperates with the third contact means to connect said other load circuit in an emergency energizing circuit with the battery, and
Claim 10
Dependent Claim
155 words
a stator having a pair of separate current generating means, a. one of said current generating means comprising winding means having an impedance high enough so that the current available therefrom at normal engine running speeds is not high enough to harm the battery when the same is fully charged, and b. the other current generating means comprising a second winding means having a substantially lower impedance and thus providing for a current output at normal engine speeds which is high enough to energize said other load circuit; B. means comprising rectifier means connecting said one winding means with the battery and through which the alternator functions to charge the battery with unidirectional current whenever the engine is running, but which prevents discharge of the battery through said one winding means when the engine is stopped; and C. circuit means for connecting said other winding means for the other load circuit independently of the battery.
Claim 11
Dependent Claim
155 words
a stator having a pair of separate current generating means, a. one of said current generating means comprising winding means having an impedance high enough so that the current available therefrom at normal engine running speeds is not high enough to harm the battery when the same is fully charged, and b. the other current generating means comprising a second winding means having a substantially lower impedance and thus providing for a current output at normal engine speeds which is high enough to energize said other load circuit; B. means comprising rectifier means connecting said one winding means with the battery and through which the alternator functions to charge the battery with unidirectional current whenever the engine is running, but which prevents discharge of the battery through said one winding means when the engine is stopped; and C. circuit means for connecting said other winding means for the other load circuit independently of the battery.
Claim 12
Dependent Claim
10 words
with the battery when the engine is not operating, or
Claim 13
Dependent Claim
10 words
with the battery when the engine is not operating, or
Claim 14
Dependent Claim
19 words
with neither said second winding means nor the battery when energization of the other load circuit is not desired.
Claim 15
Dependent Claim
19 words
with neither said second winding means nor the battery when energization of the other load circuit is not desired.
Claim 16
Dependent Claim
13 words
in a third position of said switch said other load circuit is unenergized.
Claim 17
Dependent Claim
13 words
in a third position of said switch said other load circuit is unenergized.
Claim 18
Dependent Claim
55 words
In a riding-type tractor powered by an internal combustion engine, and which is equipped with an electric starter, a storage battery that provides a source of current for the starter, a switch for controlling a connection between the battery and the starter, and another electrical load circuit, the improvement which comprises: A. an alternator having
Claim 19
Dependent Claim
55 words
In a riding-type tractor powered by an internal combustion engine, and which is equipped with an electric starter, a storage battery that provides a source of current for the starter, a switch for controlling a connection between the battery and the starter, and another electrical load circuit, the improvement which comprises: A. an alternator having
Claim 20
Dependent Claim
26 words
third contact means connected with the battery; B. said first contact means being arranged for alternative engagement with said second and third contact means so that
Claim 21
Dependent Claim
26 words
third contact means connected with the battery; B. said first contact means being arranged for alternative engagement with said second and third contact means so that
Claim 22
Dependent Claim
39 words
The riding type tractor of claim 3 wherein said circuit means comprises a second switch, further characterized by: the second switch being a double-throw three-position switch connected and arranged to provide for connection of the other load circuit alternatively
Claim 23
Dependent Claim
70 words
The riding type tractor of claim 4 wherein said second winding means also provides for a current output at substantially lower than normal engine speeds which is high enough to energize said other load circuit, further characterized by: a pair of zener diodes connected back-to-back and in shunt across said second winding means to prevent excessive voltage from being applied across the other load circuit at the higher engine speeds.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |