Patent US3760909A successfully refreshed from Google Patents.
US3760909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnet for brakes and clutches
Assignee: RCI ACQUISITIONS Inc
•
Filing: 1972-02-28
•
Granted: 1973-09-25
•
Expires: 1992-02-28
Abstract
Abstract An electromagnet for brakes and clutches having outer and inner poles and an electrical coil for magnetizing the poles for engaging the armature of the brake or clutch, in which the armature contact face of the poles is provided with alternate lands and recesses. The lands and recesses may be in a variety of different shapes, including those with straight and circular configurations. The lands are preferably crowned and the recesses may be filled with an abrasive-impregnated material, such as an epoxy, to increase the frictional characteristics of the magnet.
Inventors
- 👤 L Grove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/0031; F16D51/00; F16D69/00; F16D2069/004; F16D2121/00; F16D2121/18; F16D2121/20; F16D2127/00; F16D2127/08; F16D2127/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
56 words
An electromagnet for brakes and clutches having an armature, comprising an outer pole and an inner pole, an electrical coil for magnetizing said poles, said poles having faces for engaging the armature of the brake or clutch, and spaced armature contact surfaces consisting of a plurality of alternate lands with recesses therebetween in said pole faces.
Claim 2
Dependent Claim
56 words
An electromagnet for brakes and clutches having an armature, comprising an outer pole and an inner pole, an electrical coil for magnetizing said poles, said poles having faces for engaging the armature of the brake or clutch, and spaced armature contact surfaces consisting of a plurality of alternate lands with recesses therebetween in said pole faces.
Claim 3
Dependent Claim
49 words
An electromagnet for brakes and clutches as defined in claim 1 in which said alternate lands and recesses of said pole faces are straight and are adapted to be positioned transverse to the direction of rotation of the armature surface of the brake or clutch at said pole faces.
Claim 4
Dependent Claim
24 words
An electromagnet for brakes and clutches as defined in claim 1 in which said alternate lands and recEsses in said pole faces are circular.
Claim 5
Dependent Claim
36 words
An electromagnet for brakes and clutches as defined in claim 3 in which said outer and inner poles are circular and said lands and recesses in the pole faces are substantially concentric with the two poles.
Claim 6
Dependent Claim
17 words
An electromagnet for brakes and clutches as defined in claim 1 in which said lands are crowned.
Claim 7
Dependent Claim
27 words
An electromagnet for brakes and clutches as defined in claim 1 in which an epoxy containing an abrasive material substantially fills at least some of said recesses.
Claim 8
Dependent Claim
54 words
An electromagnet for brakes and clutches comprising two poles, an electrical coil for magnetizing said poles, each of said poles having a face for engaging an armature of a brake or clutch, and spaced armature contact surfaces consisting of alternate lands with recesses therebetween in the face of at least one of said poles.
Claim 9
Dependent Claim
54 words
An electromagnet for brakes and clutches comprising two poles, an electrical coil for magnetizing said poles, each of said poles having a face for engaging an armature of a brake or clutch, and spaced armature contact surfaces consisting of alternate lands with recesses therebetween in the face of at least one of said poles.
Claim 10
Dependent Claim
49 words
An electromagnet for brakes and clutches as defined in claim 7 in which said alternate lands and recesses of said pole face are straight and are adapted to be positioned transverse to the direction of rotation of the armature surface of the brake or clutch at the respective pole.
Claim 11
Dependent Claim
24 words
An electromagnet for brakes and clutches as defined in claim 7 in which said alternate lands and recesses in said pole face are circular.
Claim 12
Dependent Claim
36 words
An electromagnet for brakes and clutches as defined in claim 9 in which said outer and inner poles are circular and said lands and recesses in the pole faces are substantially concentric with the two poles.
Claim 13
Dependent Claim
17 words
An electromagnet for brakes and clutches as defined in claim 7 in which said lands are crowned.
Claim 14
Dependent Claim
24 words
An electromagnet for brakes and clutches as defined in claim 7 in which an abrasive-containing material substantially fills at least some of said recesses.
Claim 15
Dependent Claim
19 words
An electromagnet for brakes and clutches as defined in claim 12 in which said abrasive-containing material is an epoxy.
Claim 16
Dependent Claim
40 words
An electromagnet for brakes and clutches as defined in claim 7 in which said coil is wound on a bobbin having a flange with a friction surface on a plane substantially the same as the outer surface of said lands.
Claim 17
Dependent Claim
40 words
An electromagnet for brakes and clutches as defined in claim 11 in which said coil is wound on a bobbin having a flange with a friction surface on a plane substantially the same as the outer surface of said lands.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |