Patent US3735302A successfully refreshed from Google Patents.
US3735302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnet
Assignee: Robert Bosch GmbH
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Filing: 1972-01-03
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Granted: 1973-05-22
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Expires: 1992-01-03
Abstract
Abstract An electromagnet has a pot-shaped enclosure having a cylindrical portion and consisting of magnetizable material, and an elongated guide means which consists of non-magnetizable material and extends substantially centrally of the pot-shaped enclosure. A winding is mounted in the enclosure. An armature is slidably mounted for movement lengthwise on the guide means in response to changes in condition of energization of the winding. The enclosure has a pole piece which defines an internal surface and the armature has an external surface defining, with said internal surface, a clearance whose width remains substantially unchanged while the armature moves with reference to the guide means. The enclosure and armature have conical pole faces which define a conical gap which varies in response to movement of the armature with reference to the guide means.
Inventors
- 👤 K Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:07
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
In an electromagnet, a combination comprising a hollow enclosure in the shape of a pot-shaped magnet and consisting of magnetizable material; elongated guide means at least a portion which consists of non-magnetizable material and extends substantially centrally of said enclosure; a winding mounted in said enclosure; and an armature slidably mounted on said portion for movement lengthwise of said guide means in response to changes in condition of energization of said winding, said enclosure and said armature having conical pole faces which define a conical gap which varies in response to movement of said armature with reference to said guide means.
Claim 2
Dependent Claim
101 words
In an electromagnet, a combination comprising a hollow enclosure in the shape of a pot-shaped magnet and consisting of magnetizable material; elongated guide means at least a portion which consists of non-magnetizable material and extends substantially centrally of said enclosure; a winding mounted in said enclosure; and an armature slidably mounted on said portion for movement lengthwise of said guide means in response to changes in condition of energization of said winding, said enclosure and said armature having conical pole faces which define a conical gap which varies in response to movement of said armature with reference to said guide means.
Claim 3
Dependent Claim
144 words
In an electromagnet, a combination comprising a hollow enclosure consisting of magnetizable material; elongated guide means at least a portion of which consists of non-magnetizable material, extends substantially centrally of said enclosure and has a predetermined outer diameter; a winding mounted in said enclosure; and an armature slidably mounted on said portion for movement lengthwise of said guide means in response to changes in condition of energization of said winding, said armature having at least one first portion having an inner diameter which is greater than said outer diameter of said guide means thereby to establish a predetermined clearance between said guide means and said first portion, and said armature having at least one second portion having an inner diameter which is substantially equal to said outer diameter thereby to establish slidable contact of said armature and said guide means along said second portion.
Claim 4
Dependent Claim
144 words
In an electromagnet, a combination comprising a hollow enclosure consisting of magnetizable material; elongated guide means at least a portion of which consists of non-magnetizable material, extends substantially centrally of said enclosure and has a predetermined outer diameter; a winding mounted in said enclosure; and an armature slidably mounted on said portion for movement lengthwise of said guide means in response to changes in condition of energization of said winding, said armature having at least one first portion having an inner diameter which is greater than said outer diameter of said guide means thereby to establish a predetermined clearance between said guide means and said first portion, and said armature having at least one second portion having an inner diameter which is substantially equal to said outer diameter thereby to establish slidable contact of said armature and said guide means along said second portion.
Claim 5
Dependent Claim
52 words
A combination as defined in claim 2, wherein said enclosure is a pot-shaped magnet having a cylindrical portion which is coaxial with said guide means; and further comprising an annular pole-piece mounted at the open end of said enclosure and having an inner diameter which defines said internal surface of said enclosure.
Claim 6
Dependent Claim
22 words
A combination as defined in claim 2, wherein said armature has a first portion which is positioned intermediate to two second portions.
Claim 7
Dependent Claim
27 words
A combination as defined in claim 1, further comprising biasing means for urging said armature into a normally extended position at least partially outside of said enclosure.
Claim 8
Dependent Claim
35 words
A combination as defined in claim 5, wherein said armature has a first shoulder and said enclosure has a second shoulder, said biasing means comprising a compression spring mounted between said first and second shoulders.
Claim 9
Dependent Claim
32 words
A combination as defined in claim 1, further comprising a housing, and wherein said guide means comprises an externally threaded portion meshing with said housing for affixing said enclosure to the latter.
Claim 10
Dependent Claim
48 words
A combination as defined in claim 1, further comprising a movable member, and wherein said armature has at one end a carrying portion having securing means for securing said movable member, whereby said movable member shares the movements of said armature in response to energization of said winding.
Claim 11
Dependent Claim
69 words
A combination as defined in claim 8, wherein said securing means comprises a opening having a first configuration and wHerein said movable member comprises a section of a lever, such as that forming part of a fuel injection pump of a combustion engine, at least a portion of said lever section having a second configuration which is adapted to be mated with said carrying portion for being carried thereby.
Claim 12
Dependent Claim
24 words
A combination as defined in claim 9, wherein said first configuration comprises an annular slot and wherein said second configuration comprises a forked end.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |