US1603300A - Telephone transmitter - Google Patents

Description

Patented oct. 19, 1926.y

UNITED STATES PATENT oFF ICE.

RICHARD C. WINCKEL, OF ROSELLE, NEW JERSEY, ASSIGNOR '10 WESTERN ELECTRIC COMPANY, INCORPORATED, NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

TELEPHONE TRANSMITTER.

Application led September 2, 1924. Serial No. 735,274.

mitters, and more speciiically to a carbon button closure for confining the carbon granules to the granule chamber.

Prior to this invention, felt washers were used for this purpose. Such material, however, is open to the objection that due to the heating the electrodes are subjected to when in use these felt rings develop animal fat which condenses in the button and coats the carbon granules with grease, thus insulating the carbon granules and preventing the proper operation of the transmitter.

The object of this invention is to provide 'a carbon button 'closure which contines the carbon granules 'in a positive manner and which when submitted toA heatv is free from the objectionable release of greasy matter, characteristic of the felt washers, heretofore used for carbon closures in telephone transmitters. j

In accordance with this invention the carbon granules are confined, in the chamber by avnumber of layers of thin sheet heatresisting insulating material, these sheets having perforations so that when positioned on the electrode in which the granule chamber is formed these perforations register with the outer' open end of the granule chamber and engage the diaphragm, thereL by positively preventing the escape of the button closuregFig.

granules and at the VSametime forming a yieldable` closure to permit the diaphragm to vibrate properly in response to the voice vibrations.y

The rings are preferably of paper such as is used in electric condensers and are disposed in a fan-like arrangement which permit the diaphragm to respond accurately to its adjusted vibration frequency.

Other features of the invention and ad`- vantages will appear from the following description and by the claims appended thereto, reference beinghad to the accompanying drawings in which Fig. 1 is a sectional view of the transmitter embodying the features of this invention; Fig. 2 is a plan view .of a paper ring used therein; for the carbon closure,L Fig. 3 is a plan view of a transmitter embodying a modified form of carbon 4 is a sectional view thereof and Fig. 5 is a 1an view of a paper disc used in the modifie; form of carbon button closure shown in Figs. 3 and 4.

The telephone transmitter in which this Aprovided with a stem invention is particularly well adapted for use generally consists of a casing 10, in which the bracket 11 is mounted and held secured against the 'shoulder portion 9 of the casing by means of a mouthpiece 12, which is casing. A diaphragm 14, held securely on the front end portion of bracket 11 by means ofthe mouthpiece -12 contacts with the outermost disposed ring of a paper pad formed by a plurality of paper rings15 which are disposed in a fan-like arrangement on the front portion of electrode 16 as shown in Fig. 1. The rings 15 may be made of any well-known heat resisting material, such as paper of the kind used in electric condensers. These rings 15 are secured on the electrode 16 by means of a metal cap 17 spun pover the periphery of electrode 16. Electrode 16 is c18 which fits into an insulating bushing 19 disposed in the central portion of bracket 11 and a nut 20 screwed on the threaded end portion of stem 'o I Y screwed on the threaded portion 13 of the" 18 is provided for holding an incoming wire- Y .to its adjusted vibration frequency, while forming an eiicient closure therebetween.

In the modification of the invention shown in Figs. 3 and 4, the paper discs 15 are mounted in the insulating ring 33 and have a plurality of circular holes 26, 27, 28, etc., shown in Fig. 5, which register with the carbon cups 29, 30, 31,-etc., in the electrode 16. The'diaphragm 14 cooperates with the paper discs 15 for holding the carbon granules in the cup to form a yieldable andeiiicient closure between the diaphragm and the electrode 15 .while permitting the vdiaphragm 14 to respond accurately toits adjusted frequency. A

What is claimed is 1. In a telephone transmitter, an electrode l each other and with the granular chamber entrancev and mounted on said electrode around the entrance to said chamber, and a 4 diaphragm contacting with the outer sheet and the granules in said chamber.

2. In af telephone transmitter, an electrode having a granule chamber, a number of rings of heat-resisting insulating material surrounding the entrance to said chamber superimposed on each other and having perforations which register with each other and with the granular chamber entrance, means attached to the peripheries of said rings and electrode for binding the edges of the rings to the outer edge of the electrode, and a diaphragm held in contacting relationwith the free end of the outer ring and with thegranules in said chamber.

3. lIn a telephone transmitter, the combination with an electrode, a chamber therein containing conducting granules, a diap phragm disposed in juxtaposition and in a plane parallel to said electrode, and a plurality of paper rings mounted on said electrode and' disposed phragm for holding the granules in said electrode.

4. In a telephone transmitter, the combination lwith an electrode,

in contact with said diaa chamber in said electrode containing conductin granules, a diaphragm, and paper rings 'sposed in a fan-like arrangement in contact with said diaphragm for holding said granules in position in said electrodes. f

5. In a telephone transmitter, the combination with a recessed electrode,l carbon granules therein, a diaphragm disposedv in juxtaposition to said electrode, and a plurality of paper members disposed betweenA said diaphragm and said electrode in a manner to form a yieldable closure therebetween for holding said carbon in'said electrode and to permit the free movement of said dia-- phragm.

6. In a telephone transmitter, the combination with a circular electrode having a cavity in its central portion, granules therein, a plurality of superposed paper rings disposed on the plane surface of said electrode and concentric with said cavit a metal cap having a flange spun over said7 electrode for holding said rings in position, andI a diaphragm cooperatlng ing the carbon granules in said cavity.

In lwitness w ereof, I hereunto subscribe my name this 23rd day of August A. D.,

RICHARD C. WINCKEL.

with the rings for hold-

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