US928652A - Resistance-cup. - Google Patents

Description

' F. GOTTSGHALK.

RESISTANCE CUP.

APPLICATION FILED JUNE 3, 1908.

nur

ATTORNEY WITNESSES FELIX GOTTSCHALK, OF NEW YORK, Y.

RE SISTANCECUP.

Specification of Letters Patent.

Patentedquiy 2o, 1909'.

Appiicaaon sied June s, 190s. seria! No. 436,403;

To all lwhom it may concern:

Be it known that l, Fenix (iro'risciLxLii, a citizen ot the United States ot America, and resident of New York, in the county ot' New York and State ot' New York, have invented certain new and uset'ul lmprovements in Resistance-Cups, of which the following is a full, clear, and exact description.

This invention relates to resistance-cups for telephone-tansmitters, and more especially to those ot' microphones in which granular or finely-divided material, such as powi'lered carbon, is used as the resist-ancerarying medium, and it has for one of its objects the provision of an instrument of this kind` in which the carbon granules betweep the electrodes will be prevented from packing into practically a solid body.

My invention has, furtliern'iore, for its obj ct the provision in the carbon-receiving cup, of a series ot' partitions made of insulating` material whereby the granules are separated iiito small quantities which, however, ai'e in contact with the top and bottom electrodes. l

A further object ot' this invention resides in the combination, with the carbon-cup, of a flexible multi-partitioned device which may be inserted or removed from the cnp.

Experience has demonstrated the fact that the granulatedl carbon between the electrodes is apt to become packed under certain atmospheric conditions, in which the temperature constitutes one of the factors to be taken in consideration, so that when any contraction ot' the metal cup takes place, the resulting compression otthe carbon granules will be aptl to pack the latter, thus rendering the soinul-transmission defective and causing the' carbon to heat, which latter fact, in turn, causes frying. By virtue of my present ,invention-tam enabled to avoid the objections su'lliciently for all practical purposes, inasmuch as l divide the granular mass into a series of smaller quantities separated from each other by flexible partitions which will compensate for any compression resulting from atmospheric changes and also for the expansion of the carbon caused by heat diie to short circuit', and which will adapt themselves to the rapid interchange in position ot' the granules during the diiiierent retract-ions ot the diaphragm.- Furthern'iore, inasmuch as the location of the partitions relative to the electrodes remains permanent, it is evident that each separate mass of granules between two adjacent partitions will natufront view thereof, the cap and mouth piece' being removed; Fig. 3 shows a section of my improved electrode, on an enlarged scale; Fig. 4 is a perspective View of the carbon' sepa `ator, and Fig. 5 is a front View of a modification of the separator. v

In the drawings, T denotes in a general waythe transmitter of a telephone, comprising a shell 10, and a casing or cap 11 on which the several elements of the device are supported. `Secured to the cap 11 is a bridge 12, carrying a post 13 which holds the bottom electrode let, fitted into a casing 15 of the resistance-cup but. separated therefrom by an annular ring 16 of insulating material. The forward end of the casing 15 is screwthreaded to receive aI cap plate 17 which serves to firmly clamp in place a disk ot' mica v18 whereby the cup casing is thus closed, and' which is disposed between the top electrode 1t) and a washer 20, these parts being held together by a stud 21 whereby the cup is also attached to the diaphragm 22, which may be held irl-place in any suitable manner.

Disposed within the carbon-cup is a multipartition member 25 which in its preferred t'orm comprises an annular wall 26 (see Fig. 4) serving as a means for spacing and holding a number of partitions 27 whereby the cup chamber is divided into a series of 4separate compartments within which granulated carbon is placed so as to entirely till the enpchamber. The depth ot the member 25 is such as to till the space between the electrodes 14 and 19, so that the several carbon masses in the compartments will be practically independent of each other, and each will constitute a separate and distinct medium for' receiving'and transmitting the electric current passing from one electrode to the other.

ln order to produce the desired results previously mentioned, the member is made of a yielding insulating material which is also Capable of withstanding heat such as may be generated by the resistance on the part of the carbon to the electric current.

In Fig. 5 I have illustrated a modification of the partition-member 25, the several divisions of which are separated from each other by circular partitions 28, Vand crosspartitions 29, it being evident that this formation of the partitlons will be as effective as that indicated in Fig. 4.

I claim l; In a resistance cup for telephones or similar instruments, the combination with a casing, a pair of electrodesdisposed in said casing and insulated from each other, and granular conducting material between the electrodes, of a member disposed within said casing and made of insulating material and comprising a series of flexible partitions to divide said conducting material into separated quantities. A

` 2. In a resistance cup for telephones or similar instruments, the combination with a casing, a pair of electrodes disposed therein and insulated from each other, and granular conduti'ng material between the electrodes,

' 'of a separat-ing member disposed within said casing and com rising a series of flexible partitions exten ing between and contacting with the electrodes and for dividing the conducting material into separate quantities.

In a resistance cup for telephones or similar instruments, the combination with a casing, a pair of electrodes disposed therein and insulated from each other, and granular conducting material between the electrodes, of a separating member disposed between said electrodes and comprising a series of partitions made of yielding material and for dividing said conducting material in`to separated quantities.

4. In a resistance cupl for telephones or similar instruments, the combination with a casing, a pair of electrodes disposed therein and insulated from each other, and from the casing, and granular conducting material between and contacting with the electrodes, of a separating member interposed between the electrodes and made of heat resisting and yielding material and for'clividing said conducting material into separated quantities.

5. The combination with a cup, a pair of electrodes disposed in said cup, granular material disposed between the electrodes and comprising ha series of flexible partitions extending between the electrodes and for dividing said conducting material into separate quantities, and a cap for closing said cup and for bringing the opposite edges of said member into Contact with the electrodes. l Signed by me at New York, N.'Y., in presence of two subscribing Witnesses.

FELIX GOTTSCHALK. `IVitnesses R. B. MARTEN, y H. A. CROSBY.

Images