US4131866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid devices
Assignee: Expert Industrial Controls Ltd
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Filing: 1977-04-19
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Granted: 1978-12-26
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Expires: 1997-04-19
Abstract
Abstract A solenoid device includes a cylindrical armature movable within a core tube the tube and armature being formed from magnetisable material. The armature is smaller in diameter than the interior diameter of the tube and a pair of axially spaced recesses are defined between the tube and the armature, each recess accommodating a circumferentially extending cylindrical member. The members serve to locate the armature within the tube and as relative axial movement occurs the members roll about their circumferential axes. The dimensions of the various parts are such that the members are nipped slightly when the device is assembled.
Inventors
- 👤 Alan C. Torr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:39
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607; H01F7/081; H01F2007/085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A solenoid device: comprising a tube of circular cross-section; an axially movable cylindrical armature mounted within the tube; an electrical winding, said armature, when the winding is supplied with electric current, moving axially within the tube; means for defining a circumferential recess with respect to the internal surfaces of the tube or armature; and a rolling bearing means comprising an elongated resilient member in said recess, said member extending in a generally circumferential direction and having a substantially circular peripheral surface, the dimensions of said recess and said member being such that when the device is assembled the member will be lightly pinched between said tube and said armature but is capable of rolling within said recess during relative axial movement of said tube and said armature.
Claim 2
Dependent Claim
127 words
A solenoid device: comprising a tube of circular cross-section; an axially movable cylindrical armature mounted within the tube; an electrical winding, said armature, when the winding is supplied with electric current, moving axially within the tube; means for defining a circumferential recess with respect to the internal surfaces of the tube or armature; and a rolling bearing means comprising an elongated resilient member in said recess, said member extending in a generally circumferential direction and having a substantially circular peripheral surface, the dimensions of said recess and said member being such that when the device is assembled the member will be lightly pinched between said tube and said armature but is capable of rolling within said recess during relative axial movement of said tube and said armature.
Claim 3
Dependent Claim
28 words
A device according to claim 1 in which said recess has an axial length equal to at least half the allowed relative movement of the tube and armature.
Claim 4
Dependent Claim
16 words
A device according to claim 1 in which said member is formed as a coiled spring.
Claim 5
Dependent Claim
23 words
A device according to claim 3 in which the ends of said spring lie in close end to end relationship to each other.
Claim 6
Dependent Claim
18 words
A device according to claim 3 in which the ends of said spring overlap in the circumferential direction.
Claim 7
Dependent Claim
17 words
A device according to claim 5 including a spacer between the overlapped end portions of the spring.
Claim 8
Dependent Claim
15 words
A device according to claim 1 in which the member is formed from non-magnetic material.
Claim 9
Dependent Claim
19 words
A device according to claim 1 in which the recess is defined by a groove formed in the armature.
Claim 10
Dependent Claim
19 words
A device according to claim 1 in which the recess is defined by a groove formed in the tube.
Claim 11
Dependent Claim
24 words
A device according to claim 1 in which the recess is defined by an end portion of the armature which is of reduced diameter.
Claim 12
Dependent Claim
25 words
A device according to claim 1 in which a pair of recesses are provided, said recesses being axially spaces, each recess accommodating a resilient member.
References Cited (Backward Citations)
US3318642A
Cited
US3510814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |