US3849031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically controlled liquid fuel pump
Assignee: Walbro Corp
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Filing: 1973-05-04
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Granted: 1974-11-19
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Expires: 1993-05-04
Abstract
Abstract An electronically controlled electromagnetic pump in which a central armature passage through the annular magnetic winding serves as the pump passage with valves incorporated in the armature and in the passage. A modular electronic control system incorporating a reed switch has a plug in relationship to the winding with a mounting on the inlet side of the pump around the armature and pump passage.
Inventors
- 👤 B Charboneau
- 👤 Connor A O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/129; F04B17/00; F04B17/03; F04B17/04; F04B17/046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
In an electronically controlled pump of the type having a pump casing provided with a fuel inlet adjacent one end thereof and a fuel outlet adjacent the other end thereof, a solenoid winding, a pump tube centrally of said solenoid winding with one end thereof in fluid communication with said fuel inlet and the other end thereof in fluid communication with said fuel outlet, an armature assembly mounted for axial movement in said tube, bias means yieldably biasing said armature assembly, valves in said tube and said armature assembly, and a control circuit including a reed switch for actuating said solenoid winding, that improvement which comprises said reed switch being mounted adjacent said tube and spaced generally axially from said solenoid winding in fixed relation to said casing, and a permanently magnetized element fixedly carried by said armature assembly for movement therewith to influence said reed switch to change states to de-energize said solenoid winding when said armature has been axially moved with respect to said tube against the bias of said biasing means by energization of said solenoid winding.
Claim 2
Dependent Claim
180 words
In an electronically controlled pump of the type having a pump casing provided with a fuel inlet adjacent one end thereof and a fuel outlet adjacent the other end thereof, a solenoid winding, a pump tube centrally of said solenoid winding with one end thereof in fluid communication with said fuel inlet and the other end thereof in fluid communication with said fuel outlet, an armature assembly mounted for axial movement in said tube, bias means yieldably biasing said armature assembly, valves in said tube and said armature assembly, and a control circuit including a reed switch for actuating said solenoid winding, that improvement which comprises said reed switch being mounted adjacent said tube and spaced generally axially from said solenoid winding in fixed relation to said casing, and a permanently magnetized element fixedly carried by said armature assembly for movement therewith to influence said reed switch to change states to de-energize said solenoid winding when said armature has been axially moved with respect to said tube against the bias of said biasing means by energization of said solenoid winding.
Claim 3
Dependent Claim
101 words
An electronically controlled pump as defined in claim 1 in which the armature assembly comprises a hollow cylinder of magnetic material providing a central fluid passage, a non-magnetic insert adjacent one end of said cylinder having a passage aligned with that of said hollow cylinder, and a valve seat formed in said insert, one of said valves being slidably received in said armature assembly to cooperate with said seat, said magnetized element being mounted adjacent the free end of said insert a sufficient distance from said hollow cylinder to avoid any substantial interference with the magnetic field of said magnetized element.
Claim 4
Dependent Claim
49 words
An electronically controlled pump as defined in claim 1 in which said control circuit includes a transistor controlling the supply of power to said solenoid winding and said reed switch is included in said control circuit to change the bias of said transistor when said reed switch changes state.
Claim 5
Dependent Claim
119 words
In an electronically controlled pump utilizing a solenoid with a yieldably biased armature, that improvement which includes an armature assembly comprising a hollow magnetizable cylinder, a plastic extension on the bottom of said cylinder having a valve seat in a passage aligned with the inside of said cylinder, said plastic extension being affixed to move with said cylinder, a permanently magnetized insert adjacent the bottom of said plastic extension, and a reed switch positioned below said plastic extension to be actuated by said insert when said armature is moved to its down position by solenoid actuation, said reed switch being included in a solenoid control circuit to cut off solenoid power when closed by the proximity of said insert.
Claim 6
Dependent Claim
119 words
In an electronically controlled pump utilizing a solenoid with a yieldably biased armature, that improvement which includes an armature assembly comprising a hollow magnetizable cylinder, a plastic extension on the bottom of said cylinder having a valve seat in a passage aligned with the inside of said cylinder, said plastic extension being affixed to move with said cylinder, a permanently magnetized insert adjacent the bottom of said plastic extension, and a reed switch positioned below said plastic extension to be actuated by said insert when said armature is moved to its down position by solenoid actuation, said reed switch being included in a solenoid control circuit to cut off solenoid power when closed by the proximity of said insert.
Claim 7
Dependent Claim
58 words
An electronically controlled pump as defined in claim 1 which also comprises a plug-in module having said reed switch and said control circuit mounted thereon, said module being removably received within said pump casing, said pump casing having an opening providing access to said module, and a cover closing said opening and removably secured to said pump casing.
Claim 8
Dependent Claim
29 words
An electronically controlled pump as defined in claim 5 wherein said opening of said pump casing and said cover are adjacent the fuel inlet end of said pump casing.
Claim 9
Dependent Claim
26 words
An electronically controlled pump as defined in claim 5 wherein both said reed switch and the components of said control circuit are sealed within said module.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |