US3934216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic detent device
Assignee: Clarostat Manufacturing Co Inc
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Filing: 1974-12-11
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Granted: 1976-01-20
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Expires: 1994-12-11
Abstract
Abstract A multi-position detent device in which a plurality of detent positions are available with each position determined by discrete magnetic fields established between stator and rotor pole pieces and in which both stator and rotor have a magnet sandwiched between pole members in which the pole pieces radially project with respect to the stator and rotor pole pieces of opposite polarity projecting toward each other.
Inventors
- 👤 Frank L. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/106; B; B60; B60K; B60K35/00; B60K35/10; B60K35/20; B60K35/25; H01; H01F; H01F7/00; H01F7/02; H01F7/0231; H01F7/0242; B60K2360/00; B60K2360/126; H01H; H01H3/00; H01H3/32; H01H3/50; H01H2003/506
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
240 words
A multi-position rotary detent device including, in combination, a first rotary member, a first magnet of said first rotary member having first and second magnetic surfaces respectively oriented magnetic north and magnetic south, first and second pole members of said first rotary member respectively adjacent said first and second magnetic surfaces, and first and second pole members being in fixed relation with said first magnet and formed of a magnetic material, radially projecting first and second pole pieces of said first and second respective pole members, a second rotary member rotatably supported with respect to said first rotary member, a second magnet of said second rotary member having third and fourth magnetic surfaces respectively oriented magnetic south and magnetic north, third and fourth pole members of said second rotary member respectively adjacent said third and fourth magnetic surfaces, said third and fourth pole members being in fixed relation with said second magnet and formed of a magnetic material, radially projecting third and fourth pole pieces of said third and fourth respective pole members, said first and third pole pieces projecting toward each other, said second and fourth pole pieces projecting toward each other, and means for relatively rotating said first and second rotary members whereby the relative angular position of said first rotary member with respect to said second rotary member determines the magnetic flux paths between selected first and third pole pieces and selected second and fourth pole pieces.
Claim 2
Dependent Claim
240 words
A multi-position rotary detent device including, in combination, a first rotary member, a first magnet of said first rotary member having first and second magnetic surfaces respectively oriented magnetic north and magnetic south, first and second pole members of said first rotary member respectively adjacent said first and second magnetic surfaces, and first and second pole members being in fixed relation with said first magnet and formed of a magnetic material, radially projecting first and second pole pieces of said first and second respective pole members, a second rotary member rotatably supported with respect to said first rotary member, a second magnet of said second rotary member having third and fourth magnetic surfaces respectively oriented magnetic south and magnetic north, third and fourth pole members of said second rotary member respectively adjacent said third and fourth magnetic surfaces, said third and fourth pole members being in fixed relation with said second magnet and formed of a magnetic material, radially projecting third and fourth pole pieces of said third and fourth respective pole members, said first and third pole pieces projecting toward each other, said second and fourth pole pieces projecting toward each other, and means for relatively rotating said first and second rotary members whereby the relative angular position of said first rotary member with respect to said second rotary member determines the magnetic flux paths between selected first and third pole pieces and selected second and fourth pole pieces.
Claim 3
Dependent Claim
30 words
A multi-position rotary detent device in accordance with claim 1 in which said first rotary member constitutes the stator and said second rotary member constitutes the rotor of the device.
Claim 4
Dependent Claim
42 words
A multi-position rotary detent device in accordance with claim 1 in which said second magnet is a circular disc and said third and fourth pole members are discs with said third and fourth pole pieces projecting outwardly respectively in the planes thereof.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |