US 1760377 A
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Description (OCR text may contain errors)
F. R. SHAW RADIO LOUD SPEAKER 2 Sheets-Sheet 1 Filed March 21, 1928 INVENTOR Frederick R. S haw May 27, 1930. F. R. SHAW 1,760,577
' RADIO LOUD SPEAKER Filed March 21, 1928 2 8 t h6et 2 I NVENTOR Freda [0K R. S h aw Patented May 27, 1930 Uhlll" STATES PATENT QFFICE RADIO LOUD-SPEAKER Application filed. March 21, 1928. Serial No. 263,578.
illlS invention relates to improvenients in loud speakers for use with radio receiving sets and the like. its primary object bein! to amplify the signal received in the teiephone piece. It is designed to be used. with a pair of standard head-phones, The head-phones being placed on tire receptacles for same on the loud speaker 21. .l the amplified si 'nal will proceed from t e horn. A further object being to get the same volume of sound with a reduced number of radio tubes, thereby mailing a receiving set more economical to construct and operate. Another obje it being to provide a loud speaker for operation in conjunction with a crystal set and a pair of high resistance hea -phones. \Vith this combination. no batteries bei 1g necessary thus providing a very cheap receiving set.
lVith these and other objects in view as will appear as the description proceeds the invention consists in the novel construction arrangement of par ts as hereinafter more specifically set forth claimed and shown in the accompanying drawings fo ing a part of this present application and in which Fig. 1 is a view of the improved loud speaker.
Fig. 2 is a sectional view through the amplifier.
Fi 3 is a part sectional view of same along line A. A. of Fig. 9.
Referring more in detail to the drawin in which similar reference characters designate corresponding parts t nroughout the several views it will be seen the improved loud speaker comprises a horn 10 of the usual type which is fitted into a horizontal. tone arm 11 supported upon a. base 12 of substantial heavy design to give stability to the speaker. Each end of the tone arm is enlarged to the shape shown at 13 into which are fitted the cylinder shells 14. and are secured thereto by spring clips 15. 16 is a mica diaphragm being supported by an inner ring 17 and an outer ring 18, said inner ring 17 being slightly larger in cross sectioned diameter than the outer ring 18, this gives the diaphragm 16 a slightly convex shape. Secured to the center of the diaphragm 16 is a conical shaped member 19 being made preferably of carbon granules or some graphite composition substitute and having brass stem 20 through center one end of which is threaded and passed through the diaphragm 16 and secured thereto by a nut 21. The function of the cone-shaped member 19 to transmit the sound impulses, emitted from the diaphragm of the hen lphones, to the diaphragm 16 of the loud speaker.
The impulses of the sound potential actuate resistance vibrations in the carbon granules, similar to an electric impulse, these resistance vibrations varying a cording to the intensity of the sound wave pressure on the carbon In turn, these resistance vibrations, as rcg'stered on the caroon granules, are actuated through the medium of the brass stem 20, to the diaphagm of the loud. speaker, and th resultant audibility effected in the horn of the loud speaker. A rubber gasket 22 is provided to form a cushion between the shell 141- and the diaphragm 16 the spring clips 15 providing the required tension on said gasket and diaphragm. Inside the shell 1 1 is a funnel shaped member 23 preferably of celluloid secured at its outer edge to the shell. Fitted into the enlarged end of the shell and s cured thereto is a semiflexible rubber flange 241 having an inwardly disposed central hole 25. The face of said flange being convex in form to lit the earphone pieces which are to be placed therein and on account of its flexibility will allow them to it snug into the enlarged end or receptacle of the shell 14.
t will be seen from the foregoing that the loud speak-er is controilcd from the headphones placed into the receptacles for the same, and that the diaphragm of the loud si iealrer is actuated by the movement of the diaphragm of the phone piece.
It is believed that the construction and advantages of the structure shown may be ap parent from the foregoing paragraphs taken in conjunction with the accompanying drawings without further detailed description.
\Vhile tire preferred embodiment of the invention has been disclosed it is understood that minor changes in the details of construction, coi'nbination and arrangement of co operating elements may be resorted to Within the scope of What is claimed Without de parting from the spirit of the invention.
What I claim is 1. In a radio loud speaker having a horn, a base, a horizontal tone arm connecting With said horn having enlargements at each end, a shell adapted to. fitsaid enlargement forming an earphone piece receptacle, spring clips to secure the shell in position and a diaphragm yieldably supported in the enlarged end of the tone arm.
2. In a radio loud speaker naving a horn, a base, a horizontal tone arm connecting with said horn having an enlargement at each end,
a shell adapted to fit said enlargement forman earphone piece receptacle, spring clips to secure the shell in position, a diaphragm yieldahly supported in the enlarged end of the tone arm, a cone-shaped member made up of carbon granules rc-inforced With a metal stem and means for securing said cone-shaped member to said diaphragm.
3. In a radio load speaker having a horn, a base, a horizontal tone arm connecting with said horn having an enlargement at each end, a shell adapted to fit said enlargement forming an earphone piece receptacle, spring clips to secire said shell in position, and a semiflexible rubber flange mounted inside said shell, said flange being convex on its outer side and designed to conform itself to the shape of earphone pieces.
In testimony whereof I eliix my signature. FREDERICK RICHARD SHAVW