US3668445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnet for brakes and clutches
Assignee: RCI ACQUISITIONS Inc
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Filing: 1970-12-21
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Granted: 1972-06-06
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Expires: 1990-12-21
Abstract
Abstract An electromagnet system having a friction material for engaging an armature, a pole and electrical coil for moving said friction material into engagement with said armature, the pole being constructed of a material which has magnetic characteristics and less wear resistance than the friction material so that the friction material normally forms the principal or only surface of contact between the electromagnet and the armature. The relationship of surfaces between the pole and the friction material may be obtained by the use of compacted, unfused powdered metal as the surface for the pole. The system is adaptable for use where the magnetic attraction of an electromagnet to an armature is employed as a linkage force for a braking function or direct frictional drive, and particularly for use in vehicle brakes and power transmission clutches and brakes.
Inventors
- 👤 Leroy K Grove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:20
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; F; F16; F16D; F16D27/00; F16D27/02; F16D51/00; F16D51/16; F16D51/18; F16D51/20; F16D55/00; F16D2027/005; F16D2121/00; F16D2121/18; F16D2121/20; F16D2127/00; F16D2127/08; F16D2127/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
81 words
An electromagnet for use in electric brakes, clutches and the like having an armature movable relative to said magnet, comprising a body having a pole, an electrical coil for said pole, friction material on said body for engaging said armature when said coil iS energized, and a surface on said pole being wearable on contact with said armature at a rate greater than said friction material for maintaining said friction material as the primary contact of the electromagnet with the armature.
Claim 2
Dependent Claim
81 words
An electromagnet for use in electric brakes, clutches and the like having an armature movable relative to said magnet, comprising a body having a pole, an electrical coil for said pole, friction material on said body for engaging said armature when said coil iS energized, and a surface on said pole being wearable on contact with said armature at a rate greater than said friction material for maintaining said friction material as the primary contact of the electromagnet with the armature.
Claim 3
Dependent Claim
23 words
An electromagnet as defined in claim 1 in which said surface on said pole consists of a compacted powdered metal having electromagnetic properties.
Claim 4
Dependent Claim
21 words
An electromagnet as defined in claim 2 in which said surface is on an insert forming a portion of said pole.
Claim 5
Dependent Claim
20 words
An electromagnet as defined in claim 3 in which said friction material consists of a pad secured to said body.
Claim 6
Dependent Claim
40 words
An electromagnet as defined in claim 2 in which said surface on said pole is on a plane substantially the same as the contact surface of said friction material but is normally slightly recessed with respect to said latter surface.
Claim 7
Dependent Claim
22 words
An electromagnet as defined in claim 1 in which said body and pole are constructed of compacted powdered metal having electromagnetic properties.
Claim 8
Dependent Claim
51 words
An electromagnet as defined in claim 1 in which said body has a plurality of poles, each with a surface thereon being disintegratable on contact with said armature, and friction material on said body having a contact surface on a plane substantially the same as the plane of said pole surfaces.
Claim 9
Dependent Claim
25 words
An electromagnet as defined in claim 1 in which said surface on said pole consists essentially of a compacted, unfused powdered metal having electromagnetic properties.
Claim 10
Dependent Claim
80 words
An electromagnet for use with a relatively movable part, comprising a body of friction material, a pole, an electrical coil for engaging said friction body and said relatively movable part when said coil is energized, said pole having a surface on substantially the same plane as the part engaging surface of said friction material and of less resistance to frictional wear than said friction material for maintaining said friction material as the primary contact of the electromagnet with the armature.
Claim 11
Dependent Claim
80 words
An electromagnet for use with a relatively movable part, comprising a body of friction material, a pole, an electrical coil for engaging said friction body and said relatively movable part when said coil is energized, said pole having a surface on substantially the same plane as the part engaging surface of said friction material and of less resistance to frictional wear than said friction material for maintaining said friction material as the primary contact of the electromagnet with the armature.
Claim 12
Dependent Claim
16 words
An electromagnet as defined in claim 9 in which said surface consists of compacted metal particles.
Claim 13
Dependent Claim
21 words
An electromagnet as defined in claim 10 in which said surface is on an insert forming a part of said pole.
Claim 14
Dependent Claim
25 words
An electromagnet as defined in claim 9 in which said pole and surface are joined integrally to one another and are of the same composition.
Claim 15
Dependent Claim
31 words
An electromagnet as defined in claim 9 in which said body is of a structure for operation with said movable part consisting of an armature forming an element of a brake.
Claim 16
Dependent Claim
26 words
An electromagnet as defined in claim 9 in which said body is of a structure for operation with a plate forming an element of a clutch.
Claim 17
Dependent Claim
25 words
An electromagnet as defined in claim 9 in which said surface on said pole consists essentially of a compacted, unfused powdered metal having electromagnetic properties.
Claim 18
Dependent Claim
100 words
An electromagnet for use in actuating electric brakes, clutches and the like, comprising a body of friction material having a surface for engaging a relatively movable element, a pole and an electrical coil for engaging said body of friction material and said relatively movable element, said pole being less wear resistant then said friction material and having a surface on substantially the same plane as that of the surface on said body but slightly recessed therefrom so that the surface on said pole contacts the surface on the relatively movable element with less pressure then said body of friction material.
Claim 19
Dependent Claim
100 words
An electromagnet for use in actuating electric brakes, clutches and the like, comprising a body of friction material having a surface for engaging a relatively movable element, a pole and an electrical coil for engaging said body of friction material and said relatively movable element, said pole being less wear resistant then said friction material and having a surface on substantially the same plane as that of the surface on said body but slightly recessed therefrom so that the surface on said pole contacts the surface on the relatively movable element with less pressure then said body of friction material.
Claim 20
Dependent Claim
25 words
An electromagnet as defined in claim 16 in which said surface on said pole consists essentially of a compacted, unfused powdered metal having electromagnetic properties.
Claim 21
Dependent Claim
88 words
In a structure for actuating electric brakes, clutches and the like using a member of friction material for engaging an armature: a magnet comprising an electrical coil for engaging said member and said armature, and a pole for said coil having a surface of less wear resistance than said friction material upon contact with said armature for maintaining said friction material as the primarY contact of the electromagnet with the armature while simultaneously maintaining effective magnetic attraction between said pole and the armature when the magnet is energized.
Claim 22
Dependent Claim
88 words
In a structure for actuating electric brakes, clutches and the like using a member of friction material for engaging an armature: a magnet comprising an electrical coil for engaging said member and said armature, and a pole for said coil having a surface of less wear resistance than said friction material upon contact with said armature for maintaining said friction material as the primarY contact of the electromagnet with the armature while simultaneously maintaining effective magnetic attraction between said pole and the armature when the magnet is energized.
Claim 23
Dependent Claim
22 words
A magnet as defined in claim 18 in which said material of said pole surface is composed of compacted, unfused, powdered metal.
References Cited (Backward Citations)
US2304118A
Cited
US2267114A
Cited
US2580869A
Cited
US2834895A
Cited
US3037586A
Cited
US3255512A
Cited
US3244259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |