US1430185A - Sound reproducer - Google Patents

Description

M. SFRANKIN. souwn REPRODUCERJ APPLICATION FILED MAYIZ, 1921.

1,430,1 5, I Patented-Sept. 26,1922.

INVENTORQ ATTORNEY.

Patented Sept. 26, 1922.

brim s ster} nsane PATENT oar-ice.

Mortars s. RANKI or movmsm m, N'EWJERSEY.

seem) rel-sweetness.

Application filed May 12,

ferred form can be manufactured at a low' cost, and is particularly adapted for use as a part'of toy devices of this character.

Another object is to provide an improved mounting for the stylus bar, whereby, the

same is separated Tfrom thesound box casing by a non-conducting or sound insulating member, thus preventing the objection able scratch of the needle in the groove of the record from being conveyed to the saidcasing, as by a continuous metallic path.

A further object is to {provide insuch a device ar diaphragm-retaining gasket having an axially directed extension operative to form the yielding, resilient, sound-insulatingsupport for the stylus bar.

And still another object of the invention is to provide an improved method of mount ing the diaphragm within the "sound box casing; to provide an improved means for holding the stylus in co-operation with the stylus bar of the reproducer; to provide an improved method of attaching one end of the said stylus bar to the diaphragm; to provide an improved manner of supporting said reproducer, and other details of construction and operation fully brought out in the following description, when read in conjunction with the accompanying drawings in which Fig. 1 is a side elevation of the reproducer and the adjacent end portion of an amplifier; Fig. 2 is an enlarged diametrical section of the sound reproducer in its preferred form; Fig. 3 is a transverse section of the same; Fig. a is a plan view of the diaphragm free of the reproducer; and Fig. 5 is an enlarged detail perspective view of the folded metal blank from which the stylus bar is formed.

Referring to the drawing, it will be noted that the invention relates to the sound-reproducers for talking-machines, no other part of the same being illustrated except the small end of a tapering amplifier 1 and a S. RANKIN, a

- positioned a substantially cylindrical 1921. Serial No. 468,889.

line which represents the "plane "of any well-known form of'disc record.

The reproducer per se comprises an annular metallic mem er?) preferably having a plane face 4, while its rear portion is provlded with a late-rally. extending. integral .projection5 having an aperture 6 which forms the exit end of acha nnel tapering. towards the inlet 27, which same is prefer ably positioned centrally of the plane face of said member, and itis into the enlarged channel end '6 thatthe reduced end portion 8 of: the amplifier 1 is firmly positioned.

An annular. disc 'iias'l-ret 9 is provided, the same being positioned in uniform. contact with the outer marginal edge portion of the face 4 of the member 3, and against which gasket is positioned the peripheral portion of a. vibratory diaphragm '10, which diaphragm and gasket are both prevented from movement with respect towthe'membe r 3 by I means of a 'substantlally cylindrical sheet metallic member :11, having a radially inwardly direct-ed portion 12 closely surrounding the rear surface of the said member,- while "its oppositely positioned; nmrgi'nal edge portion 13 is flaredinwardly and forms a partial inclosure, within which there is lket 141,. bearing at its inner edge "dire; tly against the outer surface of the said diaphragm ad jacent to the "periphery of the latter, while the union between said gaskets and diaphragm may be completely air-tight by means of a thin layer 15 of suitable cement, which as shown in Fig. 4 preferably covers the exposed surfaces ofthe gasket 14 and encroaches well upon the radially outer por. tion .of the exposed surface of said diaphragm. I

' The'said gasket 14 is provided at one point with an extension 16, against the outer surface of which is closely positioned the correspondingly curved arms 17 of a stylusbar 18, while the oppositely positioned extremities 19 of said arms surround and firmly grip the opposite limiting edges of the gasket projection l6,'so that said projection forms a support for the stylus-bar, and also due to the material of which said support is formed it serves as a sound-in- Said stylus-bar comprises a shank portion formed of two thicknesses of metal folded together, the same being provided at their common adjacent end portions with lateral extensions 20, which are reversely bent and project transversely beyond the shank of said bar to form spaced fingers 21, which as clearly shown in Fig. 2 are adapted to extend through spacedapertures 22 in the said diaphragm, after which said fingers are folded to firmly grip the central apertured portion of the diaphragm in order to insure the latter vibrating in perfect har mony with the said stylus-bar. v

The stylus-bar supporting arm 17 when being formed actually comprises bifurcated extensions of the folded side portions of the shank 18, while each. of said arms has punched. radially from its central portion an ear 23, the same being provided with aligned apertures 24 and being normally/in parallel relationship. As shown in the drawing, a pin 25 extends through the said apertures 24 and pivotally supports a cam member 26 provided with a small thumb operated lever 27, so constructed and particularly shown in Fig. 3 that a stylusneedle 28 may be inserted between the ears 23 of the stylus-bar and clamped in position by a. partial rotation of the said lever, from which said needle may be readily removed as become worn by merely shifting the said lever in the opposite direction, after which as previously described a. new needle 1 may be inserted in place of the former.

As the reproducer herein described is particularly adapted for use upon inexpensive and toy sound-reproducing machines, the member 3 may well comprise a metal casting, while the cylindrical member 12 may equally well be formed of a drawn tin punching, the diaphragm formed of thin sheet metal, water-proofed paper product, bakelite, or the like, and the gaskets 9 and 14 of paper or the equivalent which has preferably been previously Water-proofed.

Havin thus described my invention, what I cdaim and desire to protect by Letters Patent of the United States is:

1. A sound-reproducer, comprising a stylus-barformed of sheet-metal folded to.

provide a shank portion comprising a double thickness, the sides'of said shank portion adjacent at one end being provided with oppositely extending fingers adapted to be secured to a vibratory diaphragm, while the opposite. end portions of said shank thicknesses are extended laterally in opposite direct-ions to provide a support for said stylus-bar, and said arms being provided with. integral parallel extending ears adapted tocreceive between them a removable stylus, and means pivotally carried by and between said ears operative to removably retain said stylus in position.

2. A sound-reproducer, comprising a diaphragm, an annular supporting gasket therefor, and a stylus connected to said diaphragm and supported directly by said.

gasket.

3; 'A' sound-reproducer, comprising a diaphragm, a supporting gasket therefor signature.

MORRIS S. RANKIN.

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