Patent US4583067A successfully refreshed from Google Patents.
US4583067A
Expired / Lapsed
US
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Electromagnetic solenoid device
Assignee: Mitsubishi Electric Corp
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Filing: 1984-10-18
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Granted: 1986-04-15
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Expires: 2004-10-18
Abstract
Abstract An electromagnetic solenoid device comprises a plunger loosely fitted in a coil so as to be slidable in the axial direction by the actuation of the coil, wherein the plunger is placed in a through hole of the coil at the side of an end plate which is provided at an end of a yoke and the plunger has an inclined portion for increasing magnetic resistance between an end of the plunger and the end plate.
Inventors
- 👤 Tadayuki Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:21
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/13; F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0675; H01F7/16; H01F7/1607
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
An electromagnetic solenoid device comprising a plunger loosely fitted in a coil so as to be slidable in the axial direction by the actuation of said coil, characterized in that said plunger is placed in a through hole of said coil at the side of an end plate which is provided at an end of a yoke, said plunger having an inclined portion for increasing magnetic resistance between an end of said plunger and said end plate, and wherein a sleeve made of a non-magnetic material is fitted in said through hole and extends over a range in which said plunger is slidingly moved.
Claim 2
Dependent Claim
104 words
An electromagnetic solenoid device comprising a plunger loosely fitted in a coil so as to be slidable in the axial direction by the actuation of said coil, characterized in that said plunger is placed in a through hole of said coil at the side of an end plate which is provided at an end of a yoke, said plunger having an inclined portion for increasing magnetic resistance between an end of said plunger and said end plate, and wherein a sleeve made of a non-magnetic material is fitted in said through hole and extends over a range in which said plunger is slidingly moved.
Claim 3
Dependent Claim
19 words
The electromagnetic solenoid device according to claim 1, wherein said inclined portion is lowered toward a control valve body.
Claim 4
Dependent Claim
55 words
The electromagnetic solenoid device according to claim 1, wherein a stationary iron core is fixed inside said coil held by said yoke; said plunger is arranged in the same axial line as said stationary iron core and a coil spring is interposed between said stationary iron core and said plunger to form an air gap.
Claim 5
Dependent Claim
27 words
The electromagnetic solenoid device according to claim 1, wherein a spool rod is connected to an end of said plunger and project into a control valve body.
Claim 6
Dependent Claim
28 words
The device of claim 1 wherein said sleeve has a smooth, finished inner surface and closely surrounds said plunger whereby said plunger is snugly received in said sleeve.
Claim 7
Dependent Claim
30 words
The device of claim 5 wherein said plunger has a groove in a surface thereof facing said sleeve, said groove extending between ends of said plunger in said axial direction.
Claim 8
Dependent Claim
13 words
The device of claim 6 wherein said through hole is filled with oil.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |