US4233585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plunger type electromagnet
Assignee: Hitachi Ltd
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Filing: 1979-03-08
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Granted: 1980-11-11
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Expires: 1999-03-08
Abstract
Abstract An electromagnet of the plunger type is disclosed which includes a plunger body and a guide for guiding the plunger body in its sliding movement. The plunger body is formed with a resin coat on the surface thereof which is brought into sliding contact with the guide, and the guide is formed with a resin at least in a portion thereof which is brought into sliding contact with the plunger body, so that in the electromagnet the magnetic resistance may be reduced and the sliding characteristics and the wear resisting property may be improved.
Inventors
- 👤 Shun-ichiro Sugimoto
- 👤 Hisazi Shinoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A plunger type electromagnet comprising: a plunger body slidingly moved by an electromagnetic force; and a guide for guiding said plunger body in its sliding movement; wherein the improvement resides in applying a resin coat to a surface of said plunger body which surface is brought into sliding contact with said guide, and in using a resinous material for forming at least a portion of said guide which portion is brought into sliding contact with said plunger body.
Claim 2
Dependent Claim
78 words
A plunger type electromagnet comprising: a plunger body slidingly moved by an electromagnetic force; and a guide for guiding said plunger body in its sliding movement; wherein the improvement resides in applying a resin coat to a surface of said plunger body which surface is brought into sliding contact with said guide, and in using a resinous material for forming at least a portion of said guide which portion is brought into sliding contact with said plunger body.
Claim 3
Dependent Claim
53 words
A plunger type electromagnet as set forth in claim 1, wherein said resin coat applied to said plunger body is formed of polyfluoroethylene, and the resinous material used for forming at least the portion of said guide which portion is brought into sliding contact with said plunger body is formed of polyacetal resin.
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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |