Patent US4153257A successfully refreshed from Google Patents.
US4153257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record stamper playback turntable
Assignee: Pickering and Co Inc
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Filing: 1977-10-11
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Granted: 1979-05-08
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Expires: 1997-10-11
Abstract
Abstract A turntable to enable playback of record matrices and stampers is provided. The turntable rotates in the direction opposite that of a conventional turntable and is provided with a tone arm carrying a stylus designed to ride the ridges of the stamper. Magnetic members on the table support surfaces hold the stamper flat to prevent "oil canning". The magnetic poles of the members are oriented radially to minimize the effect of the magnetic members on the turntable transducer. The tracking force of the tone arm is variable by means of a sliding weight.
Inventors
- 👤 Roland C. Wittenberg
- 👤 George Alexandrovich
- 👤 Frank J. Frielingsdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
G; G11; G11B; G11B23/00; G11B19/00; G11B19/20; G11B19/2009; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A record stamper playback turntable comprising: a base, a stamper platform supported for rotation to said base, a motor and drive system connected to said platform for rotating said platform in a counterclockwise direction, said drive system being such as to slip to permit platform stoppage and reverse rotation under the influence of manual pressure applied to said platform without damaging said platform so that a defect in said stamper may be located and reciprocating movement of said turntable by hand may be used to replay the defective portion a tone arm support extending from said base, a tone arm having one end pivotally attached to said support opposite from a conventional tone arm mounting and a free end, a cartridge affixed to said tone arm free end, a stylus affixed to said cartridge, said stylus having a stamper ridge tracking configuration, said tone arm being mounted to said base so as to permit said stylus to track the ridges of a stamper rotating counterclockwise on said platform and means on said platform for securing a stamper flat against said platform.
Claim 2
Dependent Claim
181 words
A record stamper playback turntable comprising: a base, a stamper platform supported for rotation to said base, a motor and drive system connected to said platform for rotating said platform in a counterclockwise direction, said drive system being such as to slip to permit platform stoppage and reverse rotation under the influence of manual pressure applied to said platform without damaging said platform so that a defect in said stamper may be located and reciprocating movement of said turntable by hand may be used to replay the defective portion a tone arm support extending from said base, a tone arm having one end pivotally attached to said support opposite from a conventional tone arm mounting and a free end, a cartridge affixed to said tone arm free end, a stylus affixed to said cartridge, said stylus having a stamper ridge tracking configuration, said tone arm being mounted to said base so as to permit said stylus to track the ridges of a stamper rotating counterclockwise on said platform and means on said platform for securing a stamper flat against said platform.
Claim 3
Dependent Claim
26 words
The invention in accordance with claim 1 wherein said drive system includes pulleys on said motor and platform and a flexible belt extending between said pulleys.
Claim 4
Dependent Claim
19 words
The invention in accordance with claim 1 wherein said securing means comprises magnetic strips disposed circumferentially about said platform.
Claim 5
Dependent Claim
19 words
The invention in accordance with claim 3 wherein the poles of each of said magnetic strips are oriented radially.
Claim 6
Dependent Claim
31 words
The invention in accordance with claim 3 further comprising means affixed to said tone arm for varying the tracking force applied by said tone arm to a stamper on said platform.
Claim 7
Dependent Claim
27 words
The invention in accordance with claim 5 wherein said last mentioned means comprises a weight disposed about said tone arm for sliding movement along said tone arm.
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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |