US1744838A - Phonographic machine - Google Patents

Description

U E EL Jan. 28,1930. G. w. PICKARD A 7 PHONOGRAPHIC momma Filed Dec. 5. 1922 I INVENTOR 'wenleqmfiafz'erfibkqrd BY fe fl t ATTORNEY Patented Jan. 28, 1930 UNITED STATES PATENT OFFICE GREENLEAI WHITTIER IPICKARD, F NEWTON CENTER, MASSACHUSETTS, ASSIGNOR TO WIRELESS SPECIALTY APPARATUS COMPANY, 013 BOSTON, MASSACHUSETTS, A

ooarotmrron on NEW YORK PHONOGRAPHIO MACHINE Application filed December 5, 1922. Serial No. 605,132.

This invention relates to improvements in phonographic machines whereby they are adapted to operation either by the phonographic record or by telephonic means such as the telephone receiver of the receiving set of a radio broadcasting system.

The-object of the invention is to simplify such apparatus and make them more etficient.

The invention consists of'the arrangement shown in the drawings, of which Figure 1 is an elevation, partly in section, of that part of 'a phonographic machine comprising the tone arm and the sound producer; Fig. 2 is an end view ofthe same; Fig. 3 is an elevation, partly in section, of another embodiment of the invention; and

Fig. 4 is a view, partly diagrammatic, il-

lustrating another embodiment.

Fig. 4 shows theapparatus described in the 120 application of George S. Davis, Serial Number 532,227, filed 27 January 1922, on pages 12 and 13, beginning at the fourth line from the bottom of page '12 and including the seventeenth line of page 13. In Fig. 4, the 5 phonograph reproducing lever BL is modified at or near its pivoted portion at P, so that that portion assumes the form of an armature' A of an electromagnetic telephone receiver (preferably polarized in the ordinary way by permanent magnet N), this telephone being-provided with windings W W adapted to be connected with the line RR, RR or a radio receiving set. When desired to change from phonographicuse to telephone use, the reproducer, including reproducing lever RL and diafragm D to which it is connected, is moved to moveneedle N from the phonograph record or table, whereupon the telephonecircuit is connected up and operates the same reproducer diafragm D'as does the needle, the sound being amplified by the ordinary sound amplifying apparatus of the phonograph. The telephone winding W W is such that telephone currents produce such varying magnetic fluxes between the magnet pole pieces 0 0 and armature A that the latter oscillates on its pivot P in the same way inwhich it oscillates when actuated by the phonograph needle N. i. e., the

- 59 telephone winding is such as to exert a torque on the pivoted armature according to construction and operation as well known to telephone engineers.

In Fig. 3 isillustrated the combination.

ture A is independent of reproducing lever BL, and is pivoted, being connected by a thin metal rod T with a diafra'gm D.. In Fig. 3' the parts are shown in the position where pivoted reproducing lever L is moved upwardly from turntable TT of the phonograph, so that the reproducer is inoperative by the phonograph record but yet operable by the telephone receiver. The common diafragm D, although constructed of mica to be suitable as a telephone diafragm as well as a phonograph diafragm, is mounted in the ordinary fashion of phonograph diafragms, i. e., between rubber gaskets U. The reproducer is shown-as of the usual construction, at R, provided with reproducer socket RS conof the telephone receiver is pivoted at 1, its lower end being supported bv spring G. The arrangement of the. polarizing magnet M is shown clearlv. the entire tele hone apparatus, including diafragm D, and also reproducing lever RL, being enclosed in a casing C having an opening X for the passage of lever RL, which carries at its outer end the needleholder NH for needle N. Casing C is secured to sound reproducer R by suitable means such as screws E.

In Figs. 1 and 2 is shown another form, wherein common diafragm D may be of mica as in Fig. 3, the end of lever RL adjacent'the center of the diafragm (to which it is connected by tie rod T) being in the form of or combined with an armature A for the telephone receive'r,the construction of which s of the type known as the Brandes. Otherwise the construction is as in Fig. 3, save that casing 0 enclosing the telephonic apparatus and nected to tone arm TA. Soft iron armature A lever BL is secured to reproducer R by clips L (Fig. 2).

In the form of Figs. 1 and 2 as in the apparatus shown in the other figures, suitable binding posts BP may be provided as shown for the telephone windings. In Figs. 2 and 3, screws S are shown by which the polarizing magnet MissecuredwithincasingC,suchmagnetsuitablysupportingtheforms fortelephone windings W and W the pole pieces (Figs. 7

1-2) 0 O of the windings being located adjacent armature A to co-operate therewith with respect to telephone diafragm D acting also as diafragm for the phonograph tone arm TA. Diafragm D is in any form of the invention designed suitably'tor operation with vacuum tube radio amplifying sets, as by being constructed of heavy mica or corrugated aluminum, so as to ensure sufiicient intensity and good quality of sound, and to be adapted to produce vibrations of sufiicient strength to render the operation of the phonographic tone arm by the radio set as eflective as it is when operated mechanically by lever ELL and needle N on the phonographic record.

By thus providinga diafragm suitably constructed and arranged to be operated by properly-disposed telephonic receiving apparatus, and to be operated as ordinarily in a phonograph by the record through lever BL, I provide an advantageous arrangement constituting a single permanent compact unit of sound producer, salable as a replacement part,

' which operates efiiciently, is not expensive to manufacture, and dispenses with so-called adapters of various sorts for temporary combination of telephone receiver complete with its own diafragm, with the sound producer of the phonograph.

As shown in Figs. 1, 2 and 3, the unit comprises a casing C constructed to be connected with the tone arm TA of the phonograph, said casing housing the telephonic apparatus, the reproducing lever RL and the diafragm D common to them both, the reproducing lever being located between the-telephonic apparatus and the common diagram, said lever extending out through casing C to needle holder NH and connected inside the casing to a central part of the diafragm D. The diafragm is supported at its perifery in the easing at the side thereof which is relatively closeto the part of the casing which is constructed to be connected to tone arm TA, and the telephone apparatus is supported on the casing at another portion which' is more remote from the tone arm; and means are provided, in all cases whereby the winding of the telephonic receiving apparatus can operate the common diafragm independently of the reproducing lever.

A sound-reproducing apparatus comprising a sound-box, a. diafragm mounted on the sound box, a needle for operating the diathe phonograph record. GREENLEAF VVHITTIER PICKABD.

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