US1381827A - Wireless phonograph for hospitals - Google Patents

Description

E. c. HANSON. WIRELESS PHONOGRAPH FOR HOSPITALS.

APPLICATION FILED JUNE 3, 1918.

1 ,38 1 ,82'7, Patented June 14, 1921.

' umrao s'rAT-ss- PAT T-- EARL C. HANSON, LOS ANGELES, CALIFORNIA, ASSIGNOB TO TI'JJLIEI IN SUBANCE AND TBU ST COMPANY, A CORPORATION 01' CALIFORNIA.

WIRELESS rnonoen'ern FOR nosrrrnns.

Application filed June 8,

To all whom it may concern:

Be it known that I, EARL G. -HANSON, a

. citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Wireless Phonograph for Hospitals, of which the following 1s a spoolfication.

My invention relates to the art of reproducing sound, and more particularly to the art of reproducing music by use of a phonograph or the like.

The principal object of my inventlon 1s to provide a phonograph whlch may be used to transmit music to a plurallty of persons who are out of the audible range of the phonograph proper.

" passage 18 forming a sound conduit is pro- My invention has a peculiar utility in connection with hospitals in which it is possible to install my apparatus in such a manner as to be entirely inaudible to all the patients except those provided with a receiving apparatus. I

Referring to the drawings whlch are for illustrative purposes only Figure 1 is a diagram showing the method of assembling and connecting the sending apparatus to the phonograph.

Fig. 2 is a diagram of one form of a receiving apparatus. a

Fig. 3 1s a diagram of another form of a receiving apparatus.

Fig. 4 is a detail showing the method of mountin the transmitters on the phonograph, 13 is detail being shown partly in sectlon along a central plane.

Fig. 5 is a section on a plane indicated by the line 5-5 of Fig. 4, this plane being viewed in the direction of the arrows.

Fig. 6 is a diagram showing a modification of the apparatus necessary to adapt it to receive and transmit direct speech.

In the embodiment of m invention illustrated in these drawings, utilize an ordinary phonograph which may be of the disk type, as shown, the record 11 being mounted on a table 12 turned by suitable means not shown. The reproducer 13 carrying the needle 14 is secured on the end of a tone arm 15, which in turn is loosely con-' nected witha casting 16 mounted on the top of the phonograph 17. A continuous vided through the interior of the casting 16 and through the tone arm 15 to the re Specification of Letters I'atent.

1913. Serial a... 288,045. g

used if desired, the object of the plurality of transmitters being to provide a magnification of the sound.

Patented June 14, 1921.

L I have found,- however, that it is diflicult,

if not impossible to work the transmitters in multiple by sim ly connectin them to common wires, and have devise a method 0%? overcoming this difliculty, as shown in n this figure I provide a transformer 30 having an iron core 31 and a single secondary 32. .As many primaries 33 are provided as there are transmitters 20, each of the primaries being connected through a battery 34 with one, terminal wire 35 of each of the transmitters 20, and the other terminal of each primary 33 being connected to a wire 36 forming the other terminal of all of the transmitters 20. The primaries 33 are desirably as nearly identical as it is possible to make them with'respect to the number of turns and their relative magnetic position with relation to the core 31 and the secondary 32. The secondary 32 is connected at 37 to ground and through a wire 38 with an antenna 39.

In practice the apparatus just described is placedat any convenient location in or near the hospital, and the antenna 39 is run in close proximity to the building, as for example, around under the eaves or'along the roof.

The method of operation of my invention is as follows:

A record 11 being laced on the table 12 and the phono raph being started, musical sounds travel t rough the passa es 18 and 19 and vibrate the diaphragms o the trans- -mitters 20 causing variable currents to flow in no condition to hear music.- In case it is desirable to allow a patient to hear the music, one or the other of the receivin sets shown in Fig. 2 or Fig. 3 may be use In Fig. 2, the patients cot is shown at 50, this cot being rovided with a mattress 51 which serves t e purpose of an insulator, the cot 50 being grounded solidly. A hlgh .efiiciency telephone receiver 52 is connected through a condenser 53 directly to the cot 50, the other terminal of the receiver 52 .bemg connected to a grip 54, which the patient desirin to hear the music grasps in his hand at t e same time plac ng the receiver 52 at his ear. The electrostatic field produced by the sendlng apparatus above described is sufliciently strong to induce a potential between the body of the patient and the ground, the body of the ggtient acting as one side of a condenser. us to the variable charge produced by the variable strength of the field,'the current will fiow from the patients body through the receiver 52 producing sounds therein which are clearly audible to the atient, these sounds being the exact repro notion of the musi played by the phonograph.

In some cases it may be more convenient to use the apparatus shown in Fig. 3, in which the cot 60 is mounted on insulators 61 and to which the receiver 62 is connected through a condenser 63 to the cot and through a wire 64 with the ground at 65.

In this case both the. patient and the cot itself furnish the necessary capacity for collectingthe electrostatic field, the current flowing from the cot through. the receiver 62 and faithfully reproducing the original music.

In some cases I provide the apparatus shown in Fig. 6 in which'a horn 7 0 1s placed on the casting 16 into which speakers may talk. It is thus possible for the newspaper to be read into the horn 70, and for the various patients throughout the hospital who.

desire to do so, to listen to the news, the reefi'ected thereby.

What I claim is: 1. A wireless phonograph for use in hos- .pitals and the like comprising a transmitter of electrostatic energy and a receiving system comprising a bed, a mattress formed of suitable material to insulate a patient from the bed, a telephone receiver connected at one terminal to ground and means connected to the other terminal of said" receiver for making an electrical connection to the body of the patient. I

2. A wireless phonograph foruse in hospitals and the like which comprises a transing means comprising a telephone receiver connected to a condenser and the other terminal of said receiver connected to a metallic grip. I

3. A receiving system for electrostatic energy comprising a telephone receiver, a connection from said telephone receiver to a capacity means and another connection from said telephone receiver to the human body whereby said body serves as a collector mainder of the patients being entirely un--- ,mitter of electrostatic energy and receiv-

Images