US921334A - Telephone-transmitter. - Google Patents

Description

H. F. ALBRIGHT.

TELEPHONE TRANSMITTER.

APPLICATION FILED FEB.24,1906.

921,334, Patented May 11,1909.

UNITED STATES PATENT oriuion.

HENRY F. ALBRIGHT, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented May 11, 1909.

Application filed February 24, 1906. Serial No. 302,696.

To all whom it may concern:

Be it known that I, HENRY'F. ALBRIGHT, citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Telephone-- Transmitters, of which the following a full, clear, concise, and exact description.

My invention relates to a telephone transmitter, and consists in various improvements in details,'having for their object an increase in the efficiency of the transmitter and ease and accuracy in adjustment of the parts.

I will describe my invention in detail by reference to the accompanying drawings, in which,

Figure 1 is a front elevation of the transmitter; Fig. 2 is a rear elevation with the c asing in section; Fig. 3 is a section on line 3-3 of Fig. 2; Fig. 4 is a detail view showing the connection between the front electrode and the corresponding cord terminal; Fig. 5 is a separated view of the frontsupporting plate and the casing of the transmitter.

The same reference characters are used to designate the same parts Wherever they are shown.

C is a cup which forms a casing for the elect-IOdu-S c and c. The inner circumferential walls of this cup are lined as usual with a strip of paper (1. The back electrode c is secured to the face of the metallic piece 6, which in turn is secured in the bottom of the cup C. The front electrode 0 is carried on the rear face of the metallic disk e, which has a threaded hub portion 0" on its front face. A mica washer d of sufficient diameter to completely cover the opening in the cup C is slipped over the hub e and is clamped against the disk e by a nut e. The usual granular carbon is placed in the cup between the opposing electrodes. These parts, constituting the resistance button, are then assembled as shown in I ig. 3, the mica washer d restin u on the inturned flanges d surrounding the ower portion of the central opening in the inverted dish-shaped bridge D. The screw threaded stud e integral with the disk e and the threaded hu b 0", passes through a hole in the center of the sound-receiving diaphragm E, which is threaded on said stud.

In order that the diaphragm may be more readily threaded on the stud, I preferably provide the opening therein with an interiorly threaded bushing 0 securely clamped to said diaphragm by a nut e", as shown in Fig. 3. A. nut c is threaded on the end of the stud c, which projects through the diaphragm. .\n insulating washer E, preferably of blotting paper or similar material, lies between the diaphragm 1C and the rim of the bridge I), the diaphragm being rotated until it seats against said blotting paper. This threaded diaphragm construction rcquires that. the diaphragm be slightly warped into place so as to firmly engage the blotting paper washer on all sides. This slight bending into position, however, does not interfere with the function of the diaphragm. In general said diaphragm should be somewhat smaller in diameter than the bridge D, in order that it may not by any possible mischance project beyond the edge of the bridge. By constructing the insulating washer E of blotting paper or similar pliable material more ellicicnt results are obtained than if the ordinary thick paper or. hard rubber is used. A soft rubber ring I) incases the periphery of the diaphragm and bridge I), and serves to insulate the same from the transmitter casing.

The above described structure constitutes the working unit which may be readily secured in or removed from the transmitter face plate B. The plate B, which constitutes what is the usual front piece of the transmitter, has an annular flange 5 within the cir cumference of which the working unit is adapted to be placed. The working unit is thus confined in such manner that there is no possibility of lateral displacr-unent, such as would put a lateral strain on the spindle connecting the movable electrode 0' and the diaphragm E, and which might prevent a proper operation of said parts. The usual amping springs D are provided. Stop plates 5 may be used to prevent the possible dislodgment of the working unit. Without these stop plates any pulling strain, due to the cord terminals being mounted on'thc working unit as hereinafter described, would come directly on said unit, and if there were nothing but the dam )ing springs to hold it in placethe parts might be pulled out or inured, which possibility is eliminated by the use of said stop plates.

The bridge I)- 18 provided with one orsnoro ears d winch register with cut out portions lllll III) in the llangeib, thereby preventing the rotation of the bridge. This is important, since these cars prevent the accidental rotation of the bridge and thrstud c therewith, which rotation might vary the adjustment of the diaphragm E.-

The. working unit is insulated from the front piece-B and the casing, as shown in the drawing, The front electrode c is connccted to the terminal plate which is insulatcdly mounted on the bridge l), and has a lug 1' passing through an opening in the said bridge to which a c-oinluctor leading from the nutc may be attached. electrically connected, as shown, to the bridge 1), and a cord terminal plate if is mounted on the bridge. As is apparent, the working unit may be completely insulated from the casing, and thereby require two cords, one for each terminal plate 1, i or the transmitter may be )rovided with a single cord, the other side of the working unit being grounded. The ground connection may be obtained by means of a wire. t running from the terminal t to a screw 15 on the plate B. The fact that the cord terminal plates are anchored to the unit itself is a very desirable feature, since by such construction the complete working unit may be easily removed and replaced by another, if desirable. When the cords have simple horse shoe shaped clips commonly used, said cords may be anchored to the plates t i by screws on said plates. However, if necessary, auxiliary cord terminal posts 1 may be provided, as shown, suitable for receiving the style of cord'tip which partially protrudes from the casing.

A and A are hollow shells which form the metallic casing of the transmitter. Theseshells are held in place in any suitable manner, preferably by L-shaped or bayonet slots (1 a which engage pins 0 on the block B. The mouthpiece M is screw threaded in an opening in said block B.

l. claim 2- 1. In a telephone transmitter, the combination with a front supporting plate, of a bridge plate having a screw-threaded opening therein and an inturned annular flange about the front face of said opening, and an cxteriorly threaded button threaded in said opening from the rear of said bridge plate against said flange, said flange thereby serving to hold the parts of said button assembled.

, 2. in a telephone transmitter, a working unit comprising a resistance varying elciiient having a movable electrode, a circular bridge plate for supporting the same, a threaded stud attached to the movable electrode, a diaphragm threaded on said stud, a pliable insulating washer between the bridge and the diaphragm, and an insulating ring incasing the circumferential edges of Theback electrode- 6 is nation with a [rent supporting plate, of a said bridge and diaphragm.

having a central.opcning therein about which said cup is secured a diaphragm havinga central opening. an interiorly-tbreaded bushing in said lattci' opening, a stud projecting from the movable electrode and threaded in said bushing, a front supporting plate, material insulating said bridge plate and diaphragm from each other and from said supporting plate, and cord terminals carried by said bridge plate.

4. in a telephone transmitter, the combibridge plate mounted thereon, said plates liaving'cacli a cent ral pcning, a cup having its open end secured about the central opening in said bridge plate, an electrode secured within said cup, a movable electrode supported about the opening in the bridge plate, c0nducting material in said cup between said electrodes, a suitably supported diaphragm, having a central threaded opening therein, a threaded stud projecting from said movable electrode and threaded in said opening in the diaphragm.

5. In a telephone transmitter, thecombination with a bridge plate, of a cup mounted on the rear of said plate about an opening therein, an electrode secured within said cup, a movable electrode supported in the opening of the cup, conducting material in said cup between said electrodes, a screw threaded stud projecting from the movable electrode, a diaphragm threaded on said stud, and a front supporting plate having a central opening facing said diaphragm.

6.,111 a telephone transmitter, a working unit comprising a button provided with a movable electrode having a threaded stud, a diaphragm threaded on said stud, a bridge plate carrying said button and forming a support tor-the edges of said diaphragm,

insu ating material between said bridge plate and diaphragm and also ncasing the edges ol the same, and terminals for said electrodes carried by said bridge plate.

7. in a telephone transmitter, the combination with a supporting plate, of an inverted dish-shaped bridge plate supported thereby, said bridge plate having a threaded central opening therein and an int-urned flange aboutthe front of said opening, a resistance button comprising a cup, a pair of electrodes within said cup, conducting material between said electrodes and a flexible cover for said cup, said cup having a threaded exterior wherebyit may be threaded in the opening in the bridge plate against said inturncd flange to hold said button in its assembled position, and a diaphragm supported upon said supporting plate and connected to one of said electrodes.

8. In a telephone transmitter, a suitably roe supported button provided with a movable electrode having a threaded stud attached thereto, a suitably supported diaphragm having a central opening, and a bushing; se-

cured in said OFGIIiIIg, said bushing being ined to recelve sald threadedteriorly threat stud, whereby by rotating said diaphragm it may be adjusted on said stud.

In witness whereof, I hereunto subscribe y name this sixteenth day of February A. I I 1906.

HENRY F. ALBRIGHT. Witnesses:

N. E. NEWTON, J. W. BANCKER.

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