US1537849A - Attachment for phonographs - Google Patents

Description

W. J. MADOLE ATTACHMENT FOR PHONOGRAPHS May 12, 1925.

Filed March 24, 1922 INVE/l/TUR W J. l iadoim FZQM K2 Patented May 12, 1925.

UNITED STATES WILL J. MADOLE, OF ATLANTA, GEORGIA.

ATTACHMENT FOR PHONOGRAPHS.

Application filed March 24, 1922. Serial No. 546,363.

To a who-m it may concern.

Be it known that I. WILL J. MADOLE, a citizen of the United States, and a resident of Atlanta, in the county of Fulton and State of Georgia, have invented certain new and useful Improvements in Attachments for Phonographs, of which the following is a specification.

It often occurs that it is desirable to amplify the words spoken over a telephone at the receiver end or to amplify the words received on a wireless telephone. The purpose of amplifying the words is to enable several persons to hear the same.

lVith the above in mind it is the object of the present invention to provide a phonograph attachment whereby the sound box or horn of the phonograph may be utilized for amplifying the sounds or words of a telephone receiver circuit or the like.

It is also an object of the invention that the attachment be extremely simple in construction and easy to apply.

Other objects will hereinafter appear.

The invention is illustrated by way of example in the accompanying drawings, in which v Figure 1 is a diagrammatic view illustrating the invention when applied to a phonograph horn and when interposed in the receiver circuit of a wireless telephone.

Figure 2 is an enlarged perspective view illustrating the attachment applied to a phonograph horn.

Referring to the drawings more particularly, H indicates generally a phonograph horn or sound box, T the tone arm, C the reproducing unit or diaphragm casing, D the diaphragm, S the stylus bar associated therewith and R the usual ring employed for holding the diaphragm or stylus in proper position. Also at H is indicated the usual form of needle holder.

In Figure 1 there is shown an antenna A consisting in the different wires 9 and connected with these wires is a. single wireJlO which is grounded as at G. Interposed in the wire 10 is a magnet generally indicated by the reference character M, said magnet comprising a suitable core 11 upon which there is placed the winding 12 and said winding being interposed in thewire 10. It is of course to be understood that in the magnet circuit there may be interposed other' means for amplifying the current passing theret-hrough, for instance, such as the audion bulb, etc., generally employed for an'iplifying currents in wireless telephony or wireless telegraphy. It will also be understood that there will be included in the receiver circuit the necessary tuning and current rectifying devices. These different means are well known by those skilled in the art and have not been shown in the present drawings. The magnet M is supported by an arm 13 which extends up wardly from the clamp member 14. The clamp member 14 is in the form ofa split sleeve havingeits divided ends turned outwardly as at 15 and is adapted to be positioned upon the reproducer diaphragm casing O in a quick and easy manner. There is also provided an armature A which consists in a circular member 15 having formed therewith a stem 16, and said stem 16 being adapted to be inserted in the usual needle holder H.

In the use of the present invention the magnet is positioned as illustrated in Figure 2. The clamp member 14 is turned o bring the magnet in the position shown with relation to the needle holder H, and the stem 16 of the armature A is inserted in the needle holder. The wires. extending from the magnet M represent the terminals of its winding 12 and may now be connected with a receiver circuit of a wireless telephone. Also it is to be understood that the present apparatus may be employed in other ways where it is desired to energize reproduction of sounds.

The variable current flowing through the magnet M will of course influence the armature A and the armature A in turn influences the stylus S for vibrating the diaphragm D carried by the reproducer C, and the horn H of sound box will amplify the vibrations of the diaphragm D.

I claim 1. An attachment for phonographs, comprising a clamp bracket to grip the casing of a phonograph reproducer, an electromagnet supported by the bracket, an armature, and a stem extending from the armature for fastening the armature in the needle holder of the reproducer.

2. In combination with a phonograph reproducer, stylus bar and needle holder, an armature having a stem insertable in the holder in place of the usual needle, an elem tromagnet, means by which the electromagnet is supported upon the l'eplOducel. in a confronting position to the armature. and means causing electrical pulsations in the electromagnet to vibrate the stylus bar.

WILL J. MADOLE.

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