Patent US3899223A successfully refreshed from Google Patents.
US3899223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearing
Assignee: Individual
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Filing: 1971-11-18
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Granted: 1975-08-12
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Expires: 1991-11-18
Abstract
Abstract A magnetic suspension bearing includes a pair of cylindrical magnets. Each magnet is magnetized to have one pole on an end surface thereof and another pole on the peripheral surface thereof. Like poles on the end surfaces of the two magnets face one another. The lines of flux extend out beyond the outer periphery of the two magnets to obtain optimum repulsive force while minimizing radial forces resulting from radial misalignment between the longitudinal axes of the two cylindrical magnets.
Inventors
- 👤 Max Baermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:17
CPC Classifications
G; G01; G01R; G01R11/00; G01R11/02; G01R11/12; G01R11/14; F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0427; F16C2370/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
258 words
A magnetic suspension bearing comprising; a pair of permanent magnets, each of said magnets having a substantially flat circular end surface and a substantially cylindrical peripheral surface intersecting said end surface at an outer peripheral edge having a peripheral edge diameter, each of said magnets being magnetized to have a pair of spaced-apart magnetic poles of opposite polarity including one magnetic pole on said end surface thereof and an opposite magnetic pole on said peripheral surface thereof, each of said magnets having a longitudinal axis and being positioned in vertically spaced relationship with said longitudinal axes extending vertically and said end surfaces facing one another in substantially parallel spaced-apart relationship to define a facing space therebetween within said peripheral edges of said pair of magnets, each of said magnetic poles on each of said magnets being directly exposed to a nonmagnetic material, said pair of poles on each of said magnets having lines of magnetic flux extending therebetween outside of said magnet, said pair of poles on each of said magnets being located relative to said peripheral edge to have said lines of magnetic flux extending into said facing space and outwardly of said facing space beyond said peripheral edge so that said lines of magnetic flux from said pair of magnets interact with one another outwardly of said facing space and said peripheral edges of said magnets at a circular vertex having a diameter substantially larger than said peripheral edge diameter and lying in a plane substantially parallel to said end surfaces and intermediate said end surfaces.
Claim 2
Dependent Claim
258 words
A magnetic suspension bearing comprising; a pair of permanent magnets, each of said magnets having a substantially flat circular end surface and a substantially cylindrical peripheral surface intersecting said end surface at an outer peripheral edge having a peripheral edge diameter, each of said magnets being magnetized to have a pair of spaced-apart magnetic poles of opposite polarity including one magnetic pole on said end surface thereof and an opposite magnetic pole on said peripheral surface thereof, each of said magnets having a longitudinal axis and being positioned in vertically spaced relationship with said longitudinal axes extending vertically and said end surfaces facing one another in substantially parallel spaced-apart relationship to define a facing space therebetween within said peripheral edges of said pair of magnets, each of said magnetic poles on each of said magnets being directly exposed to a nonmagnetic material, said pair of poles on each of said magnets having lines of magnetic flux extending therebetween outside of said magnet, said pair of poles on each of said magnets being located relative to said peripheral edge to have said lines of magnetic flux extending into said facing space and outwardly of said facing space beyond said peripheral edge so that said lines of magnetic flux from said pair of magnets interact with one another outwardly of said facing space and said peripheral edges of said magnets at a circular vertex having a diameter substantially larger than said peripheral edge diameter and lying in a plane substantially parallel to said end surfaces and intermediate said end surfaces.
Claim 3
Dependent Claim
19 words
The bearing of claim 1 wherein said magnetic poles on each of said magnets have substantially the sAme area.
Claim 4
Dependent Claim
32 words
The bearing of claim 1 wherein the distance between said one end surface of each of said magnets and said opposite magnetic pole on said peripheral surface is at least 1 millimeter.
Claim 5
Dependent Claim
26 words
The bearing of claim 1 wherein each of said magnets comprise an anisotropic powdered permanent magnet material having a coercive force of at least 1500 Oersteds.
Claim 6
Dependent Claim
19 words
The bearing of claim 4 wherein said magnetic poles on each of said magnets have substantially the same area.
Claim 7
Dependent Claim
32 words
The bearing of claim 5 wherein the distance between said one end surface of each of said magnets and said opposite magnetic pole on said peripheral surface is at least 1 millimeter.
Claim 8
Dependent Claim
24 words
The bearing of claim 1 wherein said magnets are formed of permanent magnet material from the class consisting of alnico, rare earth and ferrite.
Claim 9
Dependent Claim
54 words
The bearing of claim 1 wherein said magnets are formed of material including powdered magnetic particles and each of said magnets have a preferred direction of magnetization extending through said magnet from said pole on said one end surface to said pole on said peripheral surface, said particles being aligned in said preferred direction.
References Cited (Backward Citations)
US3233950A
Cited
US3326610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |