US1379535A - Phonograph-reproducer - Google Patents

Description

C Mi CROSSNO.

' PHONOGRAPH HEPRODUCER,

APPLICATION FILED 1UNE24, 1919.

Patented May 24, 1921.

G QSTM gw/vevwoz Mar/nag s. smr I CHARLEY ivncnossivo, or SALLISAW, OKLAHOMA.

, I'PHONYOGRAPH-REPRODUCER.

Sp ifi o of i r ent.v Patented May 241:, 1921.

- Application filed June 24, 1919. Serial No. 306,378.

To all whom it may concern: 7

Be it known that I, CHARLEY M. CnossNo, a citizen of the United States, residing at Sa-llisaw, in the county of Sequoyah and State of Oklahoma, have invented certain new and useful Improvements in Phonograph-Reproducers, of which the following is a specification.

This invention has for its object to pro vide an improved reproducer for phonographs embodying two opposed diaphragms having a common sound outlet connected with the space at either side of and between the two diaphragms whereby the sound produced is materially amplified.

Another object is the provision of a phonograph reproducer of this character by which the parts are constructed and assembled in such manner as to render the diaphragms and other interior parts conveniently accessible for repair and adjustment.

Another object is the provision of adouble diaphragm structure for phonograph reproducers in which the respective diaphragms are of different thicknesses thereby modifying the tone produced by the respective diaphragms and enhancing the tone produced by the instrument.

With these and other objects in view as will appear as the description proceeds the invention comprises the novel features of construction combination of elements and arrangement of parts which will be more fully described in the following specification and set forth with particularity in the claim appended hereto:

Figure 1 represents a side elevation of the improved reproducer applied to the tone arm of a phonograph,

Fig. 2 represents a transverse sectional view therethrough, and,

Fig. 3 represents a transverse sectional view on the line 3-3 of Fig. 2.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views the numeral 5 indicates the body of the reproducer which is formed at one point with a sound outlet 6 and at its diametrically opposite point with an opening receiving a sleeve 7 in which the stylus 8 is mounted.

The sleeve 7 is formed with oppositely di rected flanges 9 constituting abutments for the lower ends of the diaphragms 11 which are confined between the cushioning members 10 at each side of the body 5. The diaphragms are of different thicknesses which modifies the tone produced, the upper extremities of said diaphragms being held in position by the tubular member 6 cushioning elements 10 being also interposed between the diaphragms and the body and said tubular member 6* as will be apparent from Fig. 2.

Semi-spherical members 12 having internal recesses are fitted upon opposite sides of the body 5 over the flanges 9 and assist in confining the cushioning elements 10. The members 12 are secured in position by screws 15 or equivalent fastening devices and are provided centrally with passages 16 through which the sound passes from the chamber lying between the diaphragms 11 and members 12 into the hollow extensions 17 carried by the members 12. The upper parts of the hollow extensions 17 are of substantially semi-circular form and are curved to fit over and register with the apertured portion 6 of the body.

The tubular member defined at the juncture of the extensions 17 is swivelly mounted upon the reduced terminal of the tone arm 18 of a phonograph (not shown) whereby the reproducer may be turned to the position illustrated in full lines in Fig. 1 or to that shown in dotted lines, according to the type of record used.

The lower terminal of the sleeve 7 is increased in thickness and provided with diametrically opposed threaded apertures receiving screws 19 provided with pointed inner terminals engaging in sockets formed in diametrically opposed relation in the upper portion of the holder 8 whereby the latter is supported in concentrically spaced relation within the sleeve 7 in such manner that its lower socketed terminal protrudes below the sleeve for the reception of a pre ferred type of stylus 20 secured in position by a thumb screw 21 or equivalent fastening means. The upper terminal of the holder 8 is connected by rods or wires 22 with the medial portion of the diaphragms 11 whereby vibratory movement of the stylus is transmitted to the diaphragms. In use, the opening 6 in the upper part of the reproducer body constitutes an outlet for the sound produced in the chamber between the diaphragms 11 and the sound produced exteriorly of the diaphragms is admitted to the interior of the hollow extensions 17 through the outlets 16. In order to modify the tone or sound produced by the respective diaphragms, they are preferably formed of material of difii'erent thickness.

What I claim is: A reproducer including a body, opposed diaphragms engaged therewith; a, stylus;

means connecting the stylus withthe diaphragms, said body having a sound'ou'tlet with the space lying exteriorly of the diaphragms and communicating with the sound outlet of the body.

In testimony whereof I afiix mysignature hereto. 7

"CHARLEY M. CROSSNO.

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