US4835503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear proportional solenoid
Assignee: South Bend Controls Inc
•
Filing: 1986-03-20
•
Granted: 1989-05-30
•
Expires: 2006-03-20
Abstract
Abstract A solenoid device is provided having a permanent magnet mounted directly on the polepiece at the core gap to provide an initial magnetic flux through the polepiece and to focus the induced magnetic flux additionally supplied upon actuation of the solenoid. The magnetic flux through the polepiece continues across the core gap and into an armature which is supported by linear rate springs and spaced from the housing by side gaps. A coil device is mounted about the polepiece to provide induced magnetic flux in response to the applied electrical current input. The polepiece is adjustable within the housing to establish various core gap distances. The side and core gap dimensions within the magnetic flux circuit are proportioned relative to each other to maintain constant magnetic permeance about the circuit during solenoid actuation.
Inventors
- 👤 William F. Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:50
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1638; H01F7/1646; H01F7/121; H01F7/122
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A solenoid device, wherein output motion is substantially linearly porportional to the input electrical current, comprising: a housing; a moveable armature assembly mounted within said housing; a polepiece member mounted within said housing and normally spaced apart by a predetermined core gap from said armature assembly; coil means, mounted within said housing, for electromagnetically inducing magnetic flux through said polepiece, across said core gap and into said armature assembly as a result of said input electrical current; permanent magnet means, mounted onto said polepiece, for establishing, an initial flux density within said polepiece and for focusing the magnetic flux through said polepiece induced by said coil means; and said polepiece including a face area through which said magnetic flux is focused across said core gap and into said armature and wherein said permanent magnet means is mounted onto said polepiece at said core gap and is spaced apart by side gaps from said face area.
Claim 2
Dependent Claim
155 words
A solenoid device, wherein output motion is substantially linearly porportional to the input electrical current, comprising: a housing; a moveable armature assembly mounted within said housing; a polepiece member mounted within said housing and normally spaced apart by a predetermined core gap from said armature assembly; coil means, mounted within said housing, for electromagnetically inducing magnetic flux through said polepiece, across said core gap and into said armature assembly as a result of said input electrical current; permanent magnet means, mounted onto said polepiece, for establishing, an initial flux density within said polepiece and for focusing the magnetic flux through said polepiece induced by said coil means; and said polepiece including a face area through which said magnetic flux is focused across said core gap and into said armature and wherein said permanent magnet means is mounted onto said polepiece at said core gap and is spaced apart by side gaps from said face area.
Claim 3
Dependent Claim
32 words
The solenoid device according to claim 1 wherein the magnetic flux of said permanent magnet is additive with respect to the magnetic flux induced from said coil means across said core gap.
Claim 4
Dependent Claim
19 words
The solenoid device according to claim 2 wherein said permanent magnet means is formed from rare earth magnetic materials.
Claim 5
Dependent Claim
28 words
The solenoid device according to claim 3 further including means for maintaining constant magnetic permeance about the flux circuit through said housing during actuation of said solenoid device.
Claim 6
Dependent Claim
136 words
A solenoid device, wherein output motion is substantially linearly proportional to the input electrical current, comprising; a housing; a moveable armature assembly mounted within said housing; a polepiece member mounted within the said housing and normally spaced apart by a predetermined core gap from said armature assembly; coil means mounted within said housing, for electromagnetically inducing magnetic flux through said polepiece, across said core gap and into said armature assembly as a result of said input electrical current; permanent magnet means mounted onto said polepiece, for establishing an initial flux density within said polepiece and for focusing the magnetic flux through said polepiece induced by said coil means; and said polepiece being constructed of a magnetic material and being adjustably disposed within said housing such that said core gap can be established at various predetermined distances.
Claim 7
Dependent Claim
136 words
A solenoid device, wherein output motion is substantially linearly proportional to the input electrical current, comprising; a housing; a moveable armature assembly mounted within said housing; a polepiece member mounted within the said housing and normally spaced apart by a predetermined core gap from said armature assembly; coil means mounted within said housing, for electromagnetically inducing magnetic flux through said polepiece, across said core gap and into said armature assembly as a result of said input electrical current; permanent magnet means mounted onto said polepiece, for establishing an initial flux density within said polepiece and for focusing the magnetic flux through said polepiece induced by said coil means; and said polepiece being constructed of a magnetic material and being adjustably disposed within said housing such that said core gap can be established at various predetermined distances.
References Cited (Backward Citations)
US3202886A
Cited
US3775714A
Cited
US3728654A
Cited
US4164721A
Cited
US4127835A
Cited
US4462013A
Cited
US4195277A
Cited
US4306207A
Cited
US4419643A
Cited
CA1159099A
Cited
US4463322A
Cited
US4383234A
Cited
US4525695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |