US1014268A - Combined transmitter and receiver. - Google Patents

Description

W. B. THOMPSON. COMBINED TRANSMITTER AND RECEIVER.

APPLICATION FILED JUNE 20, 1911.

Patented Jan. 9, 19 12.

, 3? Thompson.

W; B. THOMPSON. COMBINED TRANSMITTER AND RECEIVER. APPLIOATION FILED JUNE 20, 1911.

2 8HEETS-SHEET 2.

I Patented Jan. 9, 1912.

To all whom it may concern:

' cover an electrical connection' with the box 12,

at North Conway, in Conway,

'on the line 3-3 of Fig.

rare v "ONE-HALE T0 ARTHUR E.

unison, or NORTH CONWAY, LNEW AMPSHIRE.

. oomfemnn TRANSMITTER am) RECEIVER.

Be it known that I, WILLIAM B. THOMP- SON, a citizen of the United States, residing in the county of Carroll and State of New Hampshire, have invented certain new and useful Improvements in Combined Transmitters and Receivers, of which the following is a specification. I v This invention relates to improvements in telephones and has particular reference to combined transmitters and receivers.

The principal object of theinvention is to improve and simplify the construction ofdevices of this character. 7

Other objects will develop as the follow ing description proceeds.

In the drawings: Figure 1 is a diagrammatic view of a system in which my device is used, Fig. 2 is a vertical section through my device, Fig. 3 is a transverse section 2, looking in the direction of the arrows, Fig. 4 is a transverse section on the line 4-4 of Fig. 2, looking in the direction of the arrows, Fig. 5 is a transverse section on the line 5-5 of Fig. 2, looking in the direction of the -arrows.

Referring to the drawings, 10 designates a base plate in which is secured the mouth piece 11. To the opposite side of the plate 10 is secured a box 12 having a removable plate 13 in the opposite endthereof, said plate 13 being provided with the insulated bushings 14 for the passage of the wires. A boss 15 is formed centrally in-the plate 13 and receives therein the stem 16 of a granular microphone 17,, and is adjust able therein by means of the set screw 18. The upper plate 19 of the granular micro-- phone has secured thereto a vertically extending rod or stem 20, the upper end of which is secured to'the center of the transg' mitting diaphragm 21. This diaphragingis; located centrally within the box 12 and close, to the inner end of the mouth piece 11 and is suspended by means of the wires 22 secured at one end to the diaphragm, and at the other end to the box by means of the screws 23. The diaphragm 21, the wires 22 and the screws 23- are all metal, and form which is also of metal. Connected to the i Specification of Letters Patent. Application filed June 20, 1911.

lower end of the stem 20 and extending Patented J an. 9, 1312. Serial No. 634,361.

through one of the bushings let is a wire 24 leading to the source of electrical supply.

Connected to a screw 26, whichis secured in the side of the box 12, is awire 25.

On a ledge 27 is mounted a shelf 28, which has a central opening 29, for the reception of the stem 20. the electromagnets 30, theends31 and 32 of the windingsof which extend through the bushings 14. Directly above theelectrdmagnets is a receivingdiaphragm 33, having a central opening34= for the stem 20.

The wires 24 and 25 of one telephone device are connected to the wires 31 and 32 of the other device, so that the movements of the diaphragm 21 0f one devicewill impart a corres onding movement to'the diaphragm 33 of the other device.

If desired, I ma provide each 'of the tele phone devices wit a controlling switch to cut out the magnets from one telephone, when that telephone is being used to transmit. Thus the voice will cause the move- Mounted on this shelf arement of the diaphragm 21, and transmit its movements to the diaphragm 3230f the other telephone, and prevent movement of the diaphragm 33 of the first telephone when talkmg. When using-the device asa transmit-- ter, the sound waves might cause the movement. of the diaphragm 33, and produce sounds which would render the sounds from the other diaphragm indistinct'or blurred.

Thus when one telephone is talking, the other one is listening, and when the other telephonedesires to talk, the receiving magnets are thrown out.

The device is particularly useful in apartment houses, hotels, factories, or on board ships, to displace the ordinary speaking tube, and

provides a much more sensitive, and cpnsequ'ently reliable device than the speakfihg' tribe.

,What is claimed is: v

I A combined telephone transmitter and receiver comprising a metallic box, 'a removable plate on the box, a granular microphone secured to said plate within the box, a shelf abote the granular microphone, eIectro magnets on the shelf, a diaphragm arranged above said magnets, said shelf and said diaphragm having central openings, a diaphragm above the first mentioned diaphragm, wires secured to the diaphragm and the box to form electrical connection In testimony whereof I aifix my signature,

therebetween, a vertical stem extending from in the presence of two Witnesses.

the ranular micro hone, through the 0 enings of the said Shelf and diaphragn i, a WILLIAM- BARBER THOMSON 5 mouth-piece arranged on the box, andmeans Witnesses:

for vertically adjusting the granular micro" MARTHA LEWIS,

phone. VESTA E. TrBBET'rs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G.

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