US1874550A - Phonograph record turntable - Google Patents

Phonograph record turntable Download PDF

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Publication number
US1874550A
US1874550A US556493A US55649331A US1874550A US 1874550 A US1874550 A US 1874550A US 556493 A US556493 A US 556493A US 55649331 A US55649331 A US 55649331A US 1874550 A US1874550 A US 1874550A
Authority
US
United States
Prior art keywords
record
turntable
springs
cam
flange
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
US556493A
Other languages
English (en)
Inventor
John J Kuhn
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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
Priority to FR738008D priority Critical patent/FR738008A/fr
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US556493A priority patent/US1874550A/en
Application granted granted Critical
Publication of US1874550A publication Critical patent/US1874550A/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
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0282—Positioning or locking of single discs of discs rotating during transducing operation by means provided on the turntable

Definitions

  • This invention relates to phonographs and particularly to the turntables thereof.
  • a scheme which has been proposed to overcome this difficulty comprises a turntable with vertical springs I protruding through suitable apertures in the record to stretch the record and thus cause it to lie flat.
  • This invention in general, is of the nature of an improvement in the aforesaid turntable and has for its object the provision of means whereby the record can be more easily and quickly placed on the turntable or removed therefrom.
  • the invention com,- prises a ring cam which when rotated through a small angle, engages the springs and forces them radially inward, thus simultaneously relieving the pressure of each spring on the record and maintaining the springs inoperatively positioned until the record has been removed and a new one put in its place.
  • Fig. 1 is a perspective of the turntable with a portion cut away to show the cam and springs and Fig. 2 is a side elevation of the turntable, also partly sectioned.
  • Fig. 1, 10 is a flanged disc which comprises the main portion of the turntable. It is made suitably heavy to absorb some of the vibration usually occurring in the drive mechanism.
  • a number of equally spaced leaf springs 11 which are secured to the flange by means of rivets 12.
  • a convenient form for the spring is that of a bow bent outward near the. free end, to hold the record flat on the turntable.
  • Around the periphery of the record 13 is a blank space in which are located openings to fit the springs. Normally, the springs 11, 11 are bent toward the flange and out of reach of the openings so that a record cannot be placed on the turntable. To force the springs inward a ring cam 14 is used.
  • the inner surface of the cam is recessed at each spring 11 to a point 15 which is free of the spring when the latter is in contact with the outer edge 16 of the openings in the rec ord.
  • the surface proper 17 is extended sufficiently so that when the springs are in contact with it the record is free of the springs. Between the surfaces 16 and 17 is an oblique portion 20 which serves to guide the springs onto the extended portion.
  • the cam is supported by four pins 18 extending through slotted openings 19 in the flange.
  • the pins serve as handles by means of which the cam can be rotated to engage the springs.
  • the slots are made long enough to insure a proper radial displacement of the springs.
  • the handle 18 To place a record on the turntable the handle 18 is moved clockwise to its extreme position to displace the springs simultaneously radially inward. The record is slipped over the springs and the handle returned to its former position to release them. Any desired pressure up to the maximum available in the springs can be obtained by properly positioning the handle between its extreme positions.
  • a turntable for phonograph records a flexible record mounted thereon, springs secured to the turntable to stretch the record, and means integral with the turntable for simultaneously controlling the pressure of the springs on the record.
  • a turntable for phonograph records a flexible record thereon, apertures around the periphery of the record, a plurality of vertical springs secured to the turntable and extending through the apertures to stretch the record radially, and means integral with the turntable comprising a ring cam for simultaneously controlling the pressure of the springs on the record.
  • a flanged turntable for phonograph records a flexible record mounted thereon, apertures in the record and vertical leaf springs extending through the apertures to stretch the record radially, said springs being equidistantly spaced about the flange and supported thereby, a ring cam supported by the ange and adapted to displace the springs simultaneousl radially.
  • a flange turntable for phonogra h records a flexible record mounted t ereon, spring means secured to the flange for stretching the record, a ring cam for simultaneously 7 operating said spring means, sup ort for the cam comprising members secure to the cam and extending through slotted openings in the flange, said members comprising the means for operating the cam.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
US556493A 1931-08-12 1931-08-12 Phonograph record turntable Expired - Lifetime US1874550A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR738008D FR738008A (US07816562-20101019-C00012.png) 1931-08-12
US556493A US1874550A (en) 1931-08-12 1931-08-12 Phonograph record turntable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US556493A US1874550A (en) 1931-08-12 1931-08-12 Phonograph record turntable

Publications (1)

Publication Number Publication Date
US1874550A true US1874550A (en) 1932-08-30

Family

ID=24221558

Family Applications (1)

Application Number Title Priority Date Filing Date
US556493A Expired - Lifetime US1874550A (en) 1931-08-12 1931-08-12 Phonograph record turntable

Country Status (2)

Country Link
US (1) US1874550A (US07816562-20101019-C00012.png)
FR (1) FR738008A (US07816562-20101019-C00012.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416135A (en) * 1945-06-04 1947-02-18 David Appleby Phonographic apparatus
US2444520A (en) * 1946-04-26 1948-07-06 Polaroid Corp Frame mounting means for flexible sheetlike materials
US2530820A (en) * 1940-07-31 1950-11-21 Rca Corp Dual idler phonograph drive
US2937916A (en) * 1956-05-29 1960-05-24 Burroughs Corp Centering and clamping arrangement
US3608909A (en) * 1969-11-03 1971-09-28 Jacob Rabinow Record-flattening turntable
EP0129292A1 (en) * 1983-06-15 1984-12-27 Koninklijke Philips Electronics N.V. Disc-record player comprising a disc-loading mechanism and disc holder for use in such a player

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530820A (en) * 1940-07-31 1950-11-21 Rca Corp Dual idler phonograph drive
US2416135A (en) * 1945-06-04 1947-02-18 David Appleby Phonographic apparatus
US2444520A (en) * 1946-04-26 1948-07-06 Polaroid Corp Frame mounting means for flexible sheetlike materials
US2937916A (en) * 1956-05-29 1960-05-24 Burroughs Corp Centering and clamping arrangement
US3608909A (en) * 1969-11-03 1971-09-28 Jacob Rabinow Record-flattening turntable
EP0129292A1 (en) * 1983-06-15 1984-12-27 Koninklijke Philips Electronics N.V. Disc-record player comprising a disc-loading mechanism and disc holder for use in such a player

Also Published As

Publication number Publication date
FR738008A (US07816562-20101019-C00012.png) 1932-12-20

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