US384201A

US384201A - gilliland

Info

Publication number: US384201A
Authority: US
Publication date: 1888-06-05
Anticipated expiration: 1905-06-05

Description

UNITED STATES PATENT OFFICE.

EZRA T. GILLILAND, OF EosToN, MASSACHUSETTS, ASSIGNOR To THE AMERICAN BELL TELEPHONE COMPANY, OF SAME PLACE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 384,201, dated June 5, 1888.

Application filed September 1!), 189.5. Serial No. 177,595. (No model.) Patented in Belgium January 27, 1886, No. 71,172, and

, in England January 19, 1886, No. 1,310.

To all whom it may concern.-

Be it known that I, EZRA T. GILLILAND, residing'at Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Telephone Trans mitters, (patented in England, No. 1,310, Jannary 29, 1886, and in Belgium, No. 71,772, January 27, 1886,) of which the following is a specification.

The present invention relates more parlicularly to the construction of battery telephones or transmitters of that class which employ as the current-varying medium a mass of mobile material-such as finelydivided carbon rcsting upon a horizontal diaphragm; and it consists in supporting such transmitter upon a vertically-swinging arm provided with means whereby as the free end of the arm is raised or lowered the telephone is so turned upon its support that in any position ofsaid arm the diaphragm remains horizontal. The invention also includes certain particular arrangements and combinations of parts as hereinafter fully set forth. C

Figure 1 is a longitudinal cross section of the transmitter and its support-ingarm. Fig.

2 isa cross-section on line :4 2, Fig. 1. Fig. 3 1s a cross-section on line 00 m, Fig. 1. Fig. 4

is a cross-section at y Fig. 1. top plan view complete.

Ois a metal casting, the upper section being cup-shaped to receive the transmitter T. The section t forms a passage or tube which in crosssection resembles an ellipse, Fig. 2. This terminates in a mouth-piece, m. The wall oft opposite the speaker or most remote is nearly flat, approximating to a plane surface. 7' is a projection integral with casting O and calculated to form ajoint.

The transmitter proper, T, is composed of a ring of insulating material, I), threaded upon the exterior. The upper edge is countersunk to receive the rim of the electrode e, which is immersed in a finely-divided conductingma 5 terial, as carbon. The electrode 6 is of brass plated with gold, so that foreign matter in the carbon cannot corrode 0r oxidizeit. The cap a has a rim screw-threaded on both outside and inside surfaces. This screws down upon Fig. 5 is a ring I and holds electrode 6 firmly in position. A centrallypcrforated ring, 0, has a screw-threaded rim, and when the thin sheet of platinum forming the diaphragm dis in position it is screwed down upon insulating-ring b and holds the diaphragm in position. An airspace or vocalizing-cha'mber is provided by turning a shoulder upon the interior of ring 0, as shown in the drawings. The electrode e is connected with the battery through cap a and the adjustable arm A. The diaphragm is the complementary electrode, and for the purpose of connecting it with the induction-coil and battery a circular plate of brass, 0, fitting the cup 0, is insulated upon its under side by an insulating-busl1iug, i, and is placed in the bottom of cup 0. The screwpost q is electrically connected to plate 0. Diaphragm (I, when the transmitter T is screwed into position in cup 0, makes Contact with plate 0. From post q an insulated con- 79 ductor, n, is carried to a screw-post, as 4, with which the primary of coil I is connected.

D is a east-metal box, which may be Screwed to the wall. The requisite number of insulated screw-posts, 8 5 7 9, are placed in the wall of box D. The inner ends of these screw-posts are headed, and the induction-coil I, fixed to the back-board, 10, has the terminals of its two coils connected to springs or projections, as 1 2, which register or coincide with the insulated .screwposts. By this arrangement of connections I am enabled to readil y change or substitute one coil for anotheigand this improved feature-that of the interchangeability of parts-4s applied tothc other elementary parts of the telephone.

The adjustable arm A is composed of two sections, A and A, as shown in Figs. 1, 4, and 5. These two sections embrace the projection S, and are pivoted thereto by pivot P. The two sections A A are also screwed together. The free end of the arm embraces projection j of the transmitter-frame, and a pivot, p, re tains the transmitter in a movable position. A metal bar, 13, is pivoted to the support S at g and to the frame of the transmitter T at f. Now as the transmitter is raised or lowered to vary its distance from any stationary object the bar B holds the transmitter T in its initial position, as with its diaphragm in a horizontal position. This automatic adjustment of the relative position of the transmitter prevents the displacement and disarrangement of the mass of finely-divided conducting material forming the contact-varying medium, and prevents any disturbance of the normal adjustment. The same arrangement would be applicable to retain any other relative posit-ion in which it mightbe found desirable to set the instrument. The spring 3 and link Z act as a counter-weight and counteract the tendency of the arm to drop.

The operation of thetransmitter is similar to others of its class.

I make no claim to the specific form of electrode e, as that is the invention of others.

\Vhat I claim, and desire to secure by Let ters Patent, is

1. The combination of a telephonetransmitter, a hollow arm pivoted to said transmitter and to a fixed support, and a rigid bar enclosed in said hollow arm and pivoted at one end to said transmitter and at the other to said support, substantially as described.

2. A. telephone-transmitter having a fixed horizontal diaphragm upon which the currentvarying medium rests, a downwardly-projecting tube or passage through which the soundwaves are directed upon the diaphragm, combined with a hinged arm, upon the free end of which the transmitter is pivoted, and a mechanical connection between the transmitter and a fixed support whereby the movement of the transmitter to vary its distance from a fixed point automatically turns the transmitter upon its piy'ot, so as to keep the diaphragm always in a horizontal position, substantially as described.

3. The combination, with a telephone con taining a body of mobile material, of a vertically-swinging arm upon which said telephone is mounted, and means for maintaining said telephone in a horizontal position as the arm is swung up and down, substantially as set forth. I 4. The combination, with a telephone containing a body of mobile material, such as finely-divided carbon particles, constituting the current-varying medium, of a verticallyswinging arm upon which said telephone is mounted, and means for maintaining said telephone in a horizontal position as the arm is swung up and down, substantially as de scribed.

In testimony whereofl have signed my name to this specification, in the presence of two subscribing witnesses, this 17th day of September, 1885.

EZRA T. GILLILAND.

Witnesses:

WM. B. VANsIzn, V. M. BERTHOLD.