US3786288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonograph record player turntable and motor assembly
Assignee: Individual
•
Filing: 1973-02-12
•
Granted: 1974-01-15
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Expires: 1993-02-12
Abstract
Abstract In modern phonograph record players, there are certain problems associated with turntable and motor vibrations. This invention provides a turntable bearing and motor system which has a single ball thrust bearing in the spindle and a second radial bearing which is vibration-isolated from the bearing housing and turntable by resilient material. The turntable is driven by a very slow directly coupled motor or by a conventional motor which drives the turntable via the above mentioned resilient material and thus any motor vibration is isolated from the turntable.
Inventors
- 👤 C Joannou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:53
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/08; H02K7/086; G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; G11B19/2018; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1677
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
A phonograph record player turntable, turntable bearing and motor assembly comprising a bearing housing member, said housing member being hollow inside and protruding through the top of said turntable to form a spindle for centering records played on said turntable; said bearing housing being rotatably attached to a stationary vertical shaft by a first bearing consisting of a single spherical ball resting between the top of said vertical shaft and the extreme upper inside part of said bearing housing; said bearing housing also being rotatably supported on said vertical shaft via a second bearing, and said second bearing being attached to the lower inside part of said bearing housing by resilient material and said resilient material functioning as compliance element to prevent transverse vibrations from being transmitted from said vertical shaft to said bearing housing; a flat rotor member attached to the lower part of said bearing housing and said rotor being exposed to a rotating magnetic field said magnetic field being produced by an array of stationary electromagnets arranged underneath said rotor and thus producing forces on said rotor which are parallel to the axis of said vertical shaft said forces being balanced by reaction at said first bearing.
Claim 2
Dependent Claim
200 words
A phonograph record player turntable, turntable bearing and motor assembly comprising a bearing housing member, said housing member being hollow inside and protruding through the top of said turntable to form a spindle for centering records played on said turntable; said bearing housing being rotatably attached to a stationary vertical shaft by a first bearing consisting of a single spherical ball resting between the top of said vertical shaft and the extreme upper inside part of said bearing housing; said bearing housing also being rotatably supported on said vertical shaft via a second bearing, and said second bearing being attached to the lower inside part of said bearing housing by resilient material and said resilient material functioning as compliance element to prevent transverse vibrations from being transmitted from said vertical shaft to said bearing housing; a flat rotor member attached to the lower part of said bearing housing and said rotor being exposed to a rotating magnetic field said magnetic field being produced by an array of stationary electromagnets arranged underneath said rotor and thus producing forces on said rotor which are parallel to the axis of said vertical shaft said forces being balanced by reaction at said first bearing.
Claim 3
Dependent Claim
49 words
A phonograph record player turntable, turntable bearing and motor assembly as defined in claim 1 in which said rotor is made of a flat circular disk on which salient poles are formed by deformation of said disk so that alternate flat and concave segments are formed on said disk.
Claim 4
Dependent Claim
70 words
A phonograph record player turntable, turntable bearing and motor assembly as defined in claim 1 in which in lieu of said rotor and said set of electromagnets a flat disk is attached at its centre to said second bearing and said disk being made to turn by a motor and thus power being transmitted from said motor to said turntable via said disk, said resilient material and said bearing housing.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |