US1045969A - Telephone-transmitter. - Google Patents

Description

I F. GO'HSCHAL-K.v

TELEPHONE TRANSMITTER.

APPLICATION FILED I'EB. 10, 1912.

Patented Dec. 3, 1912.

2 SHEETS-SHEET 1.

7 .w n m m M. E S T m G F P. GOTTSOHALK. TELEPHONE TRANSMITTER.

APPLICATION IILED FEB. 10, 1912.

masgwa Patented Dec. 3, 1912.

2 SHEETS-SHEET 8.

is hill-Si FELIX GOTTSCHALK, 0F NEW-3503K, N. Y.

TELEPHDhlE-TRANSMETTER.

Specification of Letters Patent.

1 causes.

Patented Bee. 3. i912.

Application filed February 10, 1912. Serial No. 676,50?

To all whom it may concern:

Be it known that I, FELIX Gorrsoirsmr, a citizen of the United States, residing at blew York, in the count-y of New York and I State of New York, have invented certain new and useful improvements in Telephoneiransmitters, of which the following is a specification, reference being had to the accompanying drawing.

lily invention relates to telephone transmitters and consists of an improved construction whereby the interior of the instrument is made air and water tight, the usual forwardly projectingv mputlrpiece is elimihated, and a more simple and eflicient structure secured than heretofore. There are other advantages which are hereinafter described and claimed.

ln the accompanying drawings Figure 1, represents a plan view of the transmitter embodying this invention, a portion of the guard being removed in order to show a portion of the interior construction. Fig. 2,-is acenlral sectional view through the transmitter. the diaphragm being shown only partly in section. Fig. 3. is a detail. of the terminal piece used in the transmitter shown in. these drawings. Fig. 4, is a detail of the diaphragm used, showing a spider member connected thereto, and Fig. 5, is a detail ofthc filler block and the holding ring used in this transmitter.

Similar reference characters refer to similar parts throughout the drawings.

1 is a ring forming an internally threaded casing, the sound receiving diaphragm '2 is placed acrossthe front of this casing, and a piece of suitable packing 3, such as lead or semi-vulcanized rubber, is usedto form an air-tight joint. The diaphragm is clamped to the casing by means of the screws indicated at 4 and 5. a suitable number of which are disposed through the clamping ring 6. After the diaphragm is secured in position the filler block 7 is screwed into the casing, and the annular rib 8 forces the diaphragm outwardly, thereby tauting or stretching same in a very perfect manner. It is obvious that other means can be used besides the thread, as shown, tohold the filler block in placefor instance screws passing through the casing and 'engaging the block;

Such modifications I deem within the scope of my invention; This stretched diaphragm E find to be much more etfic-ient'than the usual type, it beingmore susceptible to the delicate sound vibrations Without having annoying side tones.- This method of stretching eliminates the necessity of dampingsprings, and the tiller block in addition forms a water-tight joint where it engages the diaphragm packing.

In the center of the filler block is a cham her just large enough to hold the cell 9 containing the variable resistance medium. This cell be of any well known type and constitutes that'portion of the transmitter through which an electric current must pass to be subjectedto varying impulses from the sound receiving diaphragm -2. The cell shown iu the drawing is of a well known type having its insulated electrode toward the diaphragm, and its frame elect-rode toward the rear of the instrument, stem 10 being a part of the cell frame. l dy method of mounting this stem in its support I consider to bee separate invention and have embodied same in my application for Letters Patent for transmitter casings, Serial No. 677,112, but I disclose, this method h-w itis peculiarly adapted to this type of trans mit-ter although it is obvious that it may be used with other structures.

. The stem 10 is placed in the recessed terminal piece 11, which is insulated from the casing 1 by packing shown at 1:2 and by suit ifs ablv hushed screws 13 and 14. -TI18 stem secured in place by the adjust entscrew 15, and to prevent the ingress of moisture or air'l-provide the packing 16 and screw 17, thereby closing the opening above 15. At 18 is shown the connecting-cord or wire which is held in the terminal piece by suit.- able means such as the screw 19.

The front electrode is connected to the diaphragm by means of a spider 20, having two or more legs, the outer ends of which touch the diaphragm at int-erperipheral points. i find increased efiiciency is obtained by placing' the spider legs one-third the distance from the center to the edge of the diaphragm, although the best position diiiers with the diaphragm-thickness and determined by experiment. The spider may be secured to the diaphragm, or may simply pressed against it.

To provide means for mounting the trans- .mitter on the telephone instrument I provide'the usual back-shell 21, and induce t front of the instrument with the gua'rd Q2, having suitable apertures through it to permit the sound waves to impinge onthe diaphragmn. This guard is so shaped that it iaps over the back shell as shown, thereby permitting the same screws 23 and 24 to hold guard, back shell, and transmitter together, thus eliminating all but one joint or seam (at 25) on the outside of the instrument.

I also provide a hole 26 at the bottom of the guard to drain any saliva or other moisture that may collect in the front of the into the front cell electrode, through the variable resistance medium to the rear electrode, to the cell stem 10, to terminal piece ll and to the circuit connection 18; and it will be observed that the interior of the instrument is atall times efi'ectually sealed, thereby permitting the circuit wire to be attached or the cell adjusted without danger of permit-ting the entrance of nioistureso fatal to the cell and other interior parts.

Owing to the efliciency of a transmitter constructed in this manner, the usual flaring mouthpiece is unnecessary, and the sanitary and easily cleansed guard as shown ma; be used. The entire instrument may be plunged in any germicide solution without injury, as the interior is not only moisturethe adjustment of proof, but all air chambers are eliminated by the filler block, and therefore the small amount of air confined in the interior cannot expand or contract sutficiently to afl'ect the instrument. I'claim: 1. In a telephone transmitter, a casing, a metallic diaphragm on said casing, a clamp ring on said diaphragm, means for holding said casing rinlgand diaphragm together to form awatertight joint between thediaphragm and casing, a resistance cell means for connecting said cell with said diaphragm at two or more interperipheral points, and a'filler block adapted to stretch said diaphragm outwardly against said ring.

2. In a telephone transmitter, a metallic diaphragm, a casing, means for holding said diaphragm at all points of its periphery to thecasing, means for stretching said diahragm outwardly from said casing, a pertorated guard over said diaphragm, an insulated back-plate over said stretching means, and transmitter mechanism inclosed in the chamber formed by the diaphragm casing and back-plate.

3. In a telephone transmitter, a perforated metallic guard, a drain hole at the bottom of said guard, a metallic diaphragm back of said guard, a casing supporting said diaphragm, internal threads on the casing, a fillerblock having a. threaded edge engaging the threads in said casing, an aperture in said filler block, transmitter mechanism in said aperture, and a supporting member for said cell forming a closure for said aperture.

4. In a telephone transmitter, a metalhc diaphragm secured at its periphery to a casing, water-tight'means interposed between said diaphragm and the casing, a transmitter cell within said casing and .inclosed by said casing, a terminal in electrical connection with one side 'ofthe circuitpf said cell, a back shell covering the rear of said casing, a guard covering the front of said casing and overlapping said bacltshell, and means. for holding the casing back-shell-Iand guard together.

In testimony whereof I hereunto aflix my signature in' the presence of two Witnesses.

FELIX GOTTSCHALK.

Witnesses I H. G. TORREY,

' CHARLES T YLOR.

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