Patent US3554557A successfully refreshed from Google Patents.
US3554557A
Expired / Lapsed
US
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Gramophone turntables
Assignee: GE Healthcare UK Ltd
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Filing: 1968-11-22
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Granted: 1971-01-12
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Expires: 1988-11-22
Abstract
Abstract A rigid large-diameter gramophone turntable having a standard driving rim is made by drawing a sheet of metal to form a flat circular inner portion from which extends an outwardly stepped vertical wall joined by an annular outer flat portion, then cutting the wall along the step, turning over the outer portion and fitting its vertical wall portion tightly over that of the inner portion until the two flat portions are flush.
Inventors
- 👤 Henry James Fortune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:54
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/60; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49796
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A gramophone turntable, which comprises a circular inner portion having a substantially flat top portion and a cylindrical first wall portion integral therewith and extending downwardly from the outer edge of the top portion to provide a skirt having an internal surface suitable for friction-drive engagement, and an annular outer portion surrounding said inner portion and having a substantially flat annular top portion and a cylindrical further wall portion integral with and extending downwardly from said annular top portion at the inner edge thereof, the cylindrical wall portion of the outer portion fitted over and secured to the cylindrical wall portion of the inner portion with the top surfaces of the respective flat portions of the inner and outer turntable portions in substantially a common plane to provide a turntable having an outside diameter substantially larger than the diameter of said skirt.
Claim 2
Dependent Claim
142 words
A gramophone turntable, which comprises a circular inner portion having a substantially flat top portion and a cylindrical first wall portion integral therewith and extending downwardly from the outer edge of the top portion to provide a skirt having an internal surface suitable for friction-drive engagement, and an annular outer portion surrounding said inner portion and having a substantially flat annular top portion and a cylindrical further wall portion integral with and extending downwardly from said annular top portion at the inner edge thereof, the cylindrical wall portion of the outer portion fitted over and secured to the cylindrical wall portion of the inner portion with the top surfaces of the respective flat portions of the inner and outer turntable portions in substantially a common plane to provide a turntable having an outside diameter substantially larger than the diameter of said skirt.
Claim 3
Dependent Claim
24 words
A gramophone turntable as claimed in claim 1, wherein said further wall portion extends over approximately half the height of said first wall portion.
Claim 4
Dependent Claim
27 words
A gramophone turntable as claimed in claim 1, wherein said inner portion and said outer portion are made of sheet metal of the same gauge and composition.
Claim 5
Dependent Claim
24 words
A gramophone turntable as claimed in claim 3, wherein the outer turntable portion has at its outer edge a downwardly extending integral collar portion.
References Cited (Backward Citations)
US2505264A
Cited
US3346262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |