US3554557A - Gramophone turntables - Google Patents

Gramophone turntables Download PDF

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Publication number
US3554557A
US3554557A US778080A US3554557DA US3554557A US 3554557 A US3554557 A US 3554557A US 778080 A US778080 A US 778080A US 3554557D A US3554557D A US 3554557DA US 3554557 A US3554557 A US 3554557A
Authority
US
United States
Prior art keywords
turntable
wall portion
gramophone
cylindrical
flat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US778080A
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English (en)
Inventor
Henry James Fortune
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GE Healthcare UK Ltd
Plessey Co Ltd
Original Assignee
GE Healthcare UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GE Healthcare UK Ltd filed Critical GE Healthcare UK Ltd
Application granted granted Critical
Publication of US3554557A publication Critical patent/US3554557A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/60—Turntables for record carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49796—Coacting pieces

Definitions

  • ABSTRACT A rigid large-diameter gramophone turntable having a standard driving rim is made by drawing a sheet of [54] E. E metal to form a flat circular inner portion from which extends suns m mg an outwardly stepped vertical wall joined by an annular outer [52] U.S. Cl. 274/39, flat portion, then cutting the wall along the step, turning over 29/416 the outer portion and fitting its vertical wall portion tightly [51] Int. Cl Gllb 3/60 over that of the inner portion until the two flat portions are [50] Field of Search 274/39 flush.
  • the turntable In modern gramophones it is a common requirement that the turntable should have a diameterof approximately 11 or 12 inches and it is also frequently desirable that the turntable should be driven by means of a friction drive engaging the inside of a depending rim of the turntable. For various reasons including standardization and operating convenience it is usual for the size of this rim to be approximately 9 inches.
  • the two vertical portions are arranged to be of different diameters the second one being larger than the first, so that the inner diameter of the second portion fits closely on the outer diameter of the first portion when the final assembly is carried out.
  • the fit is so tight that no additional securing is required.
  • a somewhat looser fit may be employed, in which case the two portions can be secured together by other means such as spot welding.
  • FIGS. 1 to 4 show in section one half of a gramophone turntable in various stages, respectively, of formation and assembly.
  • FIG. 1 shows a structure which is blanked and formed from a steel sheet and has a central aperture 1 for the attachment of a die-cast boss, shown chaindotted at 7, which will form part of the center bearing of the turntable.
  • the inner portion has a flat surface 8, which will ultimately form the upper inner surface of turntable, and extending from the periphery of the portion 2 at the opposite side is an upstanding cylindrical rim fonned by a vertical wall by trimming it and forming its outer erlge to create a depending lip or collar 6.
  • the two main parts of the turntable are then separated as shown in FIG. 3 by cutting the wall on a line between the portions 3 and 4 leaving part of the connecting portion 9 attached to the first wall portion 3.
  • the part consisting of the'further wall portion 4 and the annular portion 5 is then inverted and with its further wall portion 4 assembled on to the outer surface of the first wall portion 3 with an interference fit as shown in FIG. 4.
  • the portions 2 and 5 are arranged to be in the same plane so as to form a smooth upper surface for a turntable and,
  • the first wall portion 3 forms an inner rim suitable for driving the turntable by means of a conventional friction-wheel drive (not shown).
  • the invention enables a complete turntable of the kind described to be manufactured from a single sheet of metal so that waste material is kept down, and the assembly of the two parts after separation need not involve the use of additional fastenings to keep the two parts together.
  • the result is a very inexpensive form of construction having great strength and rigidity.
  • 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.

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  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Making Paper Articles (AREA)
US778080A 1968-07-12 1968-11-22 Gramophone turntables Expired - Lifetime US3554557A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33508/68A GB1184180A (en) 1968-07-12 1968-07-12 Improvements in or relating to Gramophone Turntables

Publications (1)

Publication Number Publication Date
US3554557A true US3554557A (en) 1971-01-12

Family

ID=10353886

Family Applications (1)

Application Number Title Priority Date Filing Date
US778080A Expired - Lifetime US3554557A (en) 1968-07-12 1968-11-22 Gramophone turntables

Country Status (4)

Country Link
US (1) US3554557A (enrdf_load_stackoverflow)
DE (1) DE1903008B2 (enrdf_load_stackoverflow)
FR (1) FR1599212A (enrdf_load_stackoverflow)
GB (1) GB1184180A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780411A (en) * 1972-10-19 1973-12-25 Case Co J I Method of making blower housing assembly
US3886766A (en) * 1973-12-03 1975-06-03 Ford Motor Co Universal joint
DE3225588A1 (de) * 1981-07-09 1983-01-20 TI (Group Services) Ltd., Birmingham Waermetauscher
US11482899B2 (en) * 2018-12-14 2022-10-25 Tdk Corporation Rotating electrical machine with rotor having arc shaped permanent magnets

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505264A (en) * 1945-03-03 1950-04-25 Gen Ind Co High-inertia phonograph turntable
US3346262A (en) * 1964-11-13 1967-10-10 Warwick Electronics Inc Record changer turntable cover

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505264A (en) * 1945-03-03 1950-04-25 Gen Ind Co High-inertia phonograph turntable
US3346262A (en) * 1964-11-13 1967-10-10 Warwick Electronics Inc Record changer turntable cover

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780411A (en) * 1972-10-19 1973-12-25 Case Co J I Method of making blower housing assembly
US3886766A (en) * 1973-12-03 1975-06-03 Ford Motor Co Universal joint
DE3225588A1 (de) * 1981-07-09 1983-01-20 TI (Group Services) Ltd., Birmingham Waermetauscher
US4517721A (en) * 1981-07-09 1985-05-21 Ti (Group Services) Limited Method of making a tube in sheet heat exchanger
US11482899B2 (en) * 2018-12-14 2022-10-25 Tdk Corporation Rotating electrical machine with rotor having arc shaped permanent magnets

Also Published As

Publication number Publication date
FR1599212A (enrdf_load_stackoverflow) 1970-07-15
GB1184180A (en) 1970-03-11
DE1903008A1 (de) 1970-03-26
DE1903008B2 (de) 1978-06-01
DE1903008C3 (enrdf_load_stackoverflow) 1979-02-01

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