US4419642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid with saturable element
Assignee: Deere and Co
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Filing: 1982-01-28
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Granted: 1983-12-06
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Expires: 2002-01-28
Abstract
Abstract A solenoid includes a coil, a pole assembly, an armature movable in the pole assembly and an air gap separating the armature from part of the pole assembly. A single mumetal washer may be fixed to the armature adjacent the air gap or a pair of mumetal washers may be fixed to the armature and to one of the pole parts on opposite sides of the air gap.
Inventors
- 👤 Kenneth D. Kramer
- 👤 Kenneth J. Stoss
- 👤 Gregory E. Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/13; H01F7/16; H01F7/1607
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
A solenoid comprising: a cylindrical pole element; a hollow cylindrical armature element axially movable with respect to the pole element; an air gap interposed between the armature and pole elements, the gap, armature element and pole element comprising at least a portion of a magnetic flux circuit; an annular magnetically permeable and saturable member located in the air gap, the saturable member being formed of material other than that of the armature element and pole element and having an abrupt magnetic saturation point at a flux density lower than the flux density at which magnetic saturation occurs in the armature element and the pole element; and coil means surrounding the elements for creating a flow of magnetic flux through the flux circuit to generate a force which acts axially upon the armature element.
Claim 2
Dependent Claim
133 words
A solenoid comprising: a cylindrical pole element; a hollow cylindrical armature element axially movable with respect to the pole element; an air gap interposed between the armature and pole elements, the gap, armature element and pole element comprising at least a portion of a magnetic flux circuit; an annular magnetically permeable and saturable member located in the air gap, the saturable member being formed of material other than that of the armature element and pole element and having an abrupt magnetic saturation point at a flux density lower than the flux density at which magnetic saturation occurs in the armature element and the pole element; and coil means surrounding the elements for creating a flow of magnetic flux through the flux circuit to generate a force which acts axially upon the armature element.
Claim 3
Dependent Claim
40 words
The solenoid of claim 1, wherein: the saturable member is located in the air gap between the armature and pole elements, the saturable member being fixed to an end surface of at least one of the armature and pole elements.
Claim 4
Dependent Claim
43 words
The solenoid of claim 2, wherein: the saturable member has a tapered cross-sectional shape extending from a larger end fixed to the one of the armature and pole elements to a smaller end extending towards the other of the armature and pole elements.
Claim 5
Dependent Claim
36 words
The solenoid of claim 1, wherein: the saturable member has a tapered cross-sectional shape having a larger end fixed to the armature and a smaller end projecting towards the pole element and into the air gap.
Claim 6
Dependent Claim
22 words
The solenoid of claim 1, wherein: the saturable member comprises an annular ring mounted on the armature and having a trapezoidal-shaped cross-section.
Claim 7
Dependent Claim
40 words
The solenoid of claim 1, wherein: the saturable member comprises an annular ring mounted on the armature and having inner and outer peripheral surfaces, both peripheral surfaces having annular grooves therein defining there-between a flux-constricting portion of the saturable member.
Claim 8
Dependent Claim
12 words
The solenoid of claim 1, wherein: the saturable member consists of mumetal.
Claim 9
Dependent Claim
22 words
The solenoid of claim 1, wherein the annular saturable member has a triangular cross-sectional shape having an apex extending into the gap.
Claim 10
Dependent Claim
35 words
The solenoid of claim 1, further comprising: a further annular permeable and saturable member located in the air gap, each saturable member being fixed to a corresponding one of the pole element and armature element.
Claim 11
Dependent Claim
18 words
The solenoid of claim 9, wherein: both saturable members have triangular cross-sections with apexes oriented towards each other.
References Cited (Backward Citations)
US3517360A
Cited
US3571769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |