Patent US4438420A successfully refreshed from Google Patents.
US4438420A
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Electromagnetic activation device
Assignee: Robert Bosch GmbH
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Filing: 1982-09-27
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Granted: 1984-03-20
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Expires: 2002-09-27
Abstract
Abstract An electromagnetic activation device for valves using a hinged armature magnet. The hinged armature itself is attached to the free end of a leaf spring fastened on one end on the magnetic body and extends into the magnetic body. This leaves at least two guide air gaps (S 1 , S 2 ) with specified measurements. In this manner an advantageous magnetic efficiency with only minimal friction losses is achieved and the electromagnetic activation device can be used advantageously with anti-blocking control devices in motor vehicle brake system.
Inventors
- 👤 Heinz Leiber
- 👤 Alwin Stegmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:17
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01F7/16; H01F7/1638
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
An electromagnetic activation device for valves comprising a magnetic body, a hinged armature fastened on one side to said body and a valve actuation rod connected to said armature, a leaf spring connected at one end to said magnetic body and having a free end, said hinged armature attached to said free end of said leaf spring having an attachment point on one side of a single pole magnetic body and said hinged armature extends into the magnetic body while leaving a guide air gap between said armature and said magnetic body.
Claim 2
Dependent Claim
92 words
An electromagnetic activation device for valves comprising a magnetic body, a hinged armature fastened on one side to said body and a valve actuation rod connected to said armature, a leaf spring connected at one end to said magnetic body and having a free end, said hinged armature attached to said free end of said leaf spring having an attachment point on one side of a single pole magnetic body and said hinged armature extends into the magnetic body while leaving a guide air gap between said armature and said magnetic body.
Claim 3
Dependent Claim
68 words
An electromagnetic activation device in accordance with claim 1, characterized in that said hinged armature is disposed in the magnetic body while leaving two guide air gaps (S 1 , S 2 ), and in that the guide air gap (S 1 ) further distant from the attachment point of said leaf spring is smaller than the guide air gap (S 2 ) closer to the attachment point.
Claim 4
Dependent Claim
52 words
An electromagnetic activation device in accordance with claim 1, wherein said magnetic body is E-shaped characterized in that the attachment point of said leaf spring is on an outer leg of the E-shaped magnetic body and the valve actuation rod is on a center section (3, 33) of the E-shaped magnetic body.
Claim 5
Dependent Claim
52 words
An electromagnetic activation device in accordance with claim 2, wherein said magnetic body is E-shaped characterized in that the attachment point of said leaf spring is on an outer leg of the E-shaped magnetic body and the valve actuation rod is on a center section (3, 33) of the E-shaped magnetic body.
Claim 6
Dependent Claim
34 words
An electromagnetic activation device in accordance with claim 3, characterized in that the guide air gaps (S 1 , S 2 ) are, respectively, disposed on the outer legs of the E-shaped magnetic body.
Claim 7
Dependent Claim
34 words
An electromagnetic activation device in accordance with claim 4, characterized in that the guide air gaps (S 1 , S 2 ) are, respectively, disposed on the outer legs of the E-shaped magnetic body.
Claim 8
Dependent Claim
36 words
An electromagnetic activation device as set forth in claim 3, 4, 5, or 6 characterized in that the leaf spring is disposed at approximately one-half the width (b/2) of the guide air gap (S 1 ).
Claim 9
Dependent Claim
75 words
An electromagnetic activation device in accordance with claim 1 in which said magnetic body is U-shaped, said magnetic body including windings which are disposed on one of the two U-legs, characterized in that the attachment point of said leaf spring is on one leg of the U and that said valve actuation rod and a free end of the leaf spring are disposed on the leg of the U which is surrounded by the winding.
Claim 10
Dependent Claim
75 words
An electromagnetic activation device in accordance with claim 2 in which said magnetic body is U-shaped, said magnetic body including windings which are disposed on one of the two U-legs, characterized in that the attachment point of said leaf spring is on one leg of the U and that said valve actuation rod and a free end of the leaf spring are disposed on the leg of the U which is surrounded by the winding.
Claim 11
Dependent Claim
98 words
An electromagnetic activation device as set forth in claim 8 or 9 characterized in that the hinged armature extends around the leg of the U surrounded by the winding (25), on the inside and the outside and that two guide air gaps (S 1 , S 2 ) are disposed adjacent said U-legs surrounded by said winding and one guide air gap (S 2 ,) is disposed adjacent another leg of which the middle guide air gap (S 1 ) is smaller than the sum of both other guide air gaps (S 2 , S 2 , ).
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |