US1503529A - Radio telephone receiver - Google Patents

Description

Aug. 5-, 1924.

M. s. FINLEY RADIO TELEPHONE RECEIVER Filed July 10, 1922 Fly. 2.

mawsym z y mv lvm Patented 5, 1924.

UNITEDSTATES PATENT OFFICE.

MAX S. FINLEY, OF INDIANAIOLIS, INDIAN A.

namo TELEPHONE Application filed July 10, '1922. Serial 170. 573,987.

To all whom itmay concern:

. Be it known that I, Max S. FINLEY, a' citizen of the United States, residing at Indianapolis, in the county :of Marion and State of Indiana, have invented certain new and useful Improvements in Radio Telephone Receivers, of which the following is a specification.

This invention has reference toradio phone receivers and its object is to reduce the cost of, such a receiver to an'extreme minimum so that the instrument may be sold at an extremely low cost and yet prop vide a workable device. 15 instruments and the high cost of such instru- On account of the large demand for radio ments, especiallywith respect to receivers, a demand has grown up for great .cheapnes's of production, and by the present invention, the. demand ismet at a cost bringing-the total expense of a radio receiving set of workable efficiency to an extremely low price. a

The result is that those who desire to listen in may install their own radio sets at a cost so small that any one may invest therein and V still obtain results all out of proportion to the cost thereof.

The cost of the receiver is so small as to make it feasible to give away such receivers as advertising devices, while still obtaining good workable results.

The invention will be from a consideration'of the following detailed description taken in connection with the accompanying drawing, forming part of this specification, with the understanding that the invention is not confined to any strict conformity to the showing of the drawings, but may be changed and modified so long as such changes and modifications come within the scope of the appended claim.

In the drawings Fi re 1 is a perspective view of a radio telep one receiver.

v Fig. 2 is a longitudinal central section therethrough. FFig. 3 is a section on the line 3--3 of ig. 2.

Reihrrin'g to the drawings, there is shown a cylinder 1 with caps 2, 3, at opposite ends.

Within the cylinder 1 there is another cylinder/4, the cylinder 1 being in effect a simple sheet of paper. for containing advertising mattrpwhile the'qylinder 4 is thick and stout instance, by tightness oi .fit,.thus doing with any additional expense in insta best understood.

enough to eifectively'resist handling and also to provide a ing purposes, which insulating effect may be increased by coating the interior of the cyl inder 4 with shellac or some other suitabiinsulating material.

The cap 2 is provided ing 5 of appropriate escape of sound waves, while the cap 3 is provided with an opening 6 to permit the passage of a twisted conductor 7 which latter is held in place against thecapB by a aster 8 or .in other suitable wigs.

Within thecylinder or bo y portion 4 with a central opensize. to permit the there is lodged a permanent horse shoe mag net 9 which, because of cheapness, may be, of the'familiar toy type and held in anysuitable manner within the cylinder 4, as for away lation since such tightness of installation will resist displacement due to handling.

Surrounding the olar ends 10 of the electromagnet 9 is a s eeve 11, which may he formed of paper, shellacked or otherwise stiffened, and on the sleeve 11 is'wound a coil 12 of insulated wire of sufficient length and gage to-produce a coil of high resistance, say of one ohms, the wire beingpreferably of number 44 gage.

The coil 12 is provided with terminal extensions 13 carried through insulating tubes 14 within the main tube 4 and there coupled to heavier conductors 15' forming part of the conductor 7.

Within the zone'of influence of the mag net 10 is a diaphragm 16 of magnetic material such as a sheet of soft iron such as is used in telephone receivers. The wires of the conductor 7 terminate in clips 15 by means of which the radio receiver may he thickness sufiicient for insulat thousand or two thousand electrically connected to an aerial or to wrdly extending annular flange inserted between the said walls a. horeshoe ,magnet secured within said'casmg, a coil surrounding the olesof said magnet and having the termina wires thereof passing out throughthe aperture in one of sald heads, adiaphragm secured to and extending across the aperture in the other head,- and means for connecting said terminal wires with a receivin% set.

n testimony whereof, I afiix my signature hereto. MAX S. FINLEY.

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