US3784853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homopolar motor forming a sound record support
Assignee: Individual
•
Filing: 1972-05-03
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Granted: 1974-01-08
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Expires: 1992-05-03
Abstract
Abstract A sound record moving device for a sound recording and reproducing apparatus has a base member and a turntable mounted for rotation on the base member. The turntable is constructed from an electrically conductive material. A magnet is arranged near the periphery of the turntable, and a device in contact with the turntable feeds a current thereto. The turntable, magnet, and current feeding device are arranged cooperatively to form a homopolar motor, with the turntable functioning as the armature of such motor.
Inventors
- 👤 P Wangsness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; G11B15/00; G11B15/18; H; H02; H02K; H02K31/00; H02K31/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc for creating a magnetic field in said disc means and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor, the motor still further including a base membeR and provided with a shaft rotatably mounted to said base member, constructed from an electrically conductive material, and connected to said disc means at a center point thereof, said shaft projecting from a sound record receicing surface of said disc means for forming a spindle for cooperating with a hole in the record, the current feeding means being arranged in electrically conductive contact with said shaft, and magnetic means associated with said disc means and base member for repulsing one member from the other and forming a bearing.
Claim 2
Dependent Claim
186 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc for creating a magnetic field in said disc means and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor, the motor still further including a base membeR and provided with a shaft rotatably mounted to said base member, constructed from an electrically conductive material, and connected to said disc means at a center point thereof, said shaft projecting from a sound record receicing surface of said disc means for forming a spindle for cooperating with a hole in the record, the current feeding means being arranged in electrically conductive contact with said shaft, and magnetic means associated with said disc means and base member for repulsing one member from the other and forming a bearing.
Claim 3
Dependent Claim
146 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc for creating a magnetic field in said disc means and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor, and the motor further including a base member, magnetic means associated with said disc means and base member for repulsing one member from the other and forming a bearing, and means also associated with said disc means and base member for guiding said disc means in a direction parallel to the plane of said disc means.
Claim 4
Dependent Claim
146 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc for creating a magnetic field in said disc means and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor, and the motor further including a base member, magnetic means associated with said disc means and base member for repulsing one member from the other and forming a bearing, and means also associated with said disc means and base member for guiding said disc means in a direction parallel to the plane of said disc means.
Claim 5
Dependent Claim
18 words
A structure as defined in claim 2, wherein said disc has a coating of an electrically insulating material.
Claim 6
Dependent Claim
119 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc means for creating a magnetic field in said disc means, the magnetic field creating means being a pair of magnets having opposed poles adjacent and arranged bracketing at least a portion of the periphery of said disc means, and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor.
Claim 7
Dependent Claim
119 words
A motor including a movable element in the form of a disc means for receiving a sound record thereon and forming a means for directly moving a sound record, said disc means being constructed from an electrically conductive material, and the motor further including means arranged adjacent said disc means for creating a magnetic field in said disc means, the magnetic field creating means being a pair of magnets having opposed poles adjacent and arranged bracketing at least a portion of the periphery of said disc means, and means for feeding a current to said disc means for causing same to rotate, said disc means, the magnetic field creating means, and the current feeding means forming a homopolar motor.
Claim 8
Dependent Claim
81 words
A structure as defined in claim 4, wherein the motor includes a base member and is provided with a shaft rotatably mounted to said base member, constructed from an electrically conductive material, and connected to said disc means at a center point thereof, said shaft projecting from a sound record receiving surface of said disc means for forming a spindle for cooperating with a hole in the record, the current feeding means being arranged in electricaly conductive contact with said shaft.
Claim 9
Dependent Claim
28 words
A structure as defined in claim 5, wherein said record receiving surface and the spindle forming portion of said shaft have a coating of an electrically insulating material.
Claim 10
Dependent Claim
61 words
A sound record moving device for a sound recording and reproducing apparatus, comprising, in combination: a. a base member; b. means for directly moving a sound record; c. means for movably mounting the moving means to said base member; and d. magnetic means associated with the moving means and base member for repulsing one from the other and forming a bearing.
Claim 11
Dependent Claim
61 words
A sound record moving device for a sound recording and reproducing apparatus, comprising, in combination: a. a base member; b. means for directly moving a sound record; c. means for movably mounting the moving means to said base member; and d. magnetic means associated with the moving means and base member for repulsing one from the other and forming a bearing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |