US1879722A - Needle for sound reproducing instruments - Google Patents

Needle for sound reproducing instruments Download PDF

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Publication number
US1879722A
US1879722A US494532A US49453230A US1879722A US 1879722 A US1879722 A US 1879722A US 494532 A US494532 A US 494532A US 49453230 A US49453230 A US 49453230A US 1879722 A US1879722 A US 1879722A
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Prior art keywords
needle
sound
record
sound reproducing
support
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Expired - Lifetime
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US494532A
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Walton Alfred Leonard
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Walton Alfred Leonard
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/44Styli, e.g. sapphire, diamond
    • G11B3/46Constructions or forms Disposition or mounting, e.g. attachment of point to shank
    • G11B3/48Needles

Description

Sept. 27; 1932.
A. L. WALTQN NEEDLE FOR SOUND REPRODUCING INSTRUMENTS Filed NOV. 10, 1930 INVENTOR Gui mm Patented Sept. 2 7, 1932 UNITED STATES ALFRED LEONARD .WALTON, onBLAcKrooL} ENGLAND NEEDLE FOR SOUND REPRODUCIIQ'GINSTBUMENTS Application filed November 10, 1930. Serial No. 494,532.
The invention relates to needles for use in sound reproducing instruments, and is of the type constructed with a fine wire core surrounded by a support of relatively softer material, the wire being adapted to engage the reproducing track of a gramophone record, the softer casing being adapted to lie on and to be ground away by frictional contact with the surface of the record.
In this type of needle the perfect trans mission of recorded sound vibrations to the stylus bar and diaphragm of a sound reproducing instrument is dependent upon the supporting material being of sufiicient strength and thickness to adequately support the sound box of the sound reproducing instrument; being sufficiently firm to give adequate and continuous support to the fine wire core; transmitting the recorded sound vibrations from the record to the stylus bar and diaphragm without loosening its grip on the wire core and causing a partial loss of such vibrations with consequent imperfect reproduction; and being in such relation to the wire core as regards surface area that the removal of such supporting material by frictional contact with the surface of the record will not interfere with the vibrationsat the needle point. I am aware that it has been proposed with the vibrations at the needle point, such supporting material is not of suflicient strength and thickness to adequately support the sound box of the sound'reproducing' instrument. I am also aware that it has been proposed to use a soft or wearable supporting material composed of a combination of graphite, beeswax and resin, but such supporting material also fails to satisfy the essential conditions in that if made sufficiently firm to give adequate and continuous support to the fine wire core and transmit the recorded sound vibrations from the record to the stylus bar and diaphragm without loosening its grip on the wire corefthe removalv of such sup-; porting material by frictional contact with the surface of the record interferes withthe vibrations at the needle point, causing a par tial loss of such vibrations with consequent imperfect reproduction. i 1
"The essential featureof my inventionlies in the wire core being surrounded by a firm material which satisfiesall the requiredcon ditions essential to the perfect transmission of recorded sound vibrations to the stylus bar and diaphragmof a sound reproducing instrument," in that the said supporting mate; rial gives the fine wire core rigid and contin-' uous support, and is yet sufficiently soft to be I easily removed by frictional contact with the surface of the record ofa sound reproducing inStrument-.- I l j r I o According to the invention the needle com prises'a fine, hard Wire adapted to engage the reproducing trackof a gramophone rec ord,.and a supporting material whichis com? posed of clay,china clay, or a composition of graphite and china clay, kilned, calcined or baked hard to "give the desired firmness and wearing properties. v. i
The said wire and supporting material maybe adapted to be mounted direct into the p needle socket of thesoundboxof a so-undre- 1 producing inflstrument,for may be carried in" a'chuck provided with a shank adapted to be held in the needle socket of the sound a sound reproducing instrument. H
The invention will be fully described with reference to the accompanying" drawing, in which, for clearness, the needle is drawn to an enlarged scale.
Fig. 1 is an elevation part in section of one form of the invention.
Fig. 2 is an elevationpartly in section of box of another form.
Fig. 3 is a diagrammatic sectional elevation of the needle and record. 7 V
The wire a is of a gauge sufficiently fine to lie within the sound groove of a gramopho-ne record, and is of hardened steel or alloy em bedded in and supported by a support I) composed of clay, china clay, or a composition" of graphite and china clay, kilned, calcined or baked hard toJgive thedesired firmness and wearing properties, the graphite serving as a lubricant between the needle and the record A when the said graphite is worn away by frictional contact with the record.
The support I) is shown fitted into a cylindrivcal chuck 0 provided with a shank d adapted to be held in the needle socket of the sound box of a sound reproducing instrument.
In the form shown in Fig. '2, the needle comprised of the fine wire a and calcined support 6 is gripped in asplit chuck 03 over which a taperingcap e is secured to hold it firmly by releasing the cap 0 the needletmay be withdrawn from the chuck and its length adjusted as required. r r 7 The needle is applicable for useon records having a laterally sinusoidal groove or of the hill and dale type as the supporting material is ground away by frictional contact with the sides or bottom of the grooves of the record as necessary due to the wear of the wire fa and does not interfere withthevibrations of the needle, a What I claim as my invention and to protect by Letters Patent is i l. A needle for use insound reproducing instruments comprising a fine hard wire core to engage the reproducingtrack of the gramophone and a. casing of calcined material .to rigidly support the core and be worn away by frictional contact with the, surface of the record.
2. A needle for use in sound reproducinginstruments comprising a fine hard 'wire core to engage the reproducing track of the g'ramophone and a casing of calcined china clay torigidly support the core and be worn away by frictional contact with the surface of the record. I v g 3. A needle for use in sound reproducing 1 instruments comprising a fine hard wire core to engage the reproducing track of the gramophone and a casingiof a combination p of graphite and china clay calcined and. baked hard together, to rigidly support the 7 core and be worn away by frictional contact with the surface of the record. 7
In testimony whereof I have hereunto set myhand.
' ALFRED LEONARD WALTON.
desire,
US494532A 1930-11-10 1930-11-10 Needle for sound reproducing instruments Expired - Lifetime US1879722A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534735A (en) * 1945-01-19 1950-12-19 Dictaphone Corp Guarded stylus
US2629605A (en) * 1949-05-18 1953-02-24 Krisch Kube Phonograph needle
US2734033A (en) * 1956-02-07 menard
US4247120A (en) * 1979-03-13 1981-01-27 Dunn Halbert B Sound recording

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734033A (en) * 1956-02-07 menard
US2534735A (en) * 1945-01-19 1950-12-19 Dictaphone Corp Guarded stylus
US2629605A (en) * 1949-05-18 1953-02-24 Krisch Kube Phonograph needle
US4247120A (en) * 1979-03-13 1981-01-27 Dunn Halbert B Sound recording

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