US651198A - Telephone-transmitter. - Google Patents

Description

Patented )une 5. |900.

J. M. MOORE. A TELEPHONE TRANSMITTER.

(Application led Sept. 23, 1899.)

(No Model.)

A TTOH/VEYS W/ TNE SSE S NTTED STATES PATENT Error..

JOSEPH M. MOORE, OE OHATHAM, iLLINOIs.

'TELEPHONE-TRANSMITTER.

SPECIFICATION formingpart of Letters Patent No. 651,198, dated June 5, 1900.

Application filed September 23, 1899. Serial No. 731,436. (No model.)

T0 @ZZ whom t may concern:

Be it known that I, JOSEPH M. MOORE, of Chatham, in the county of Sangamon and State of Illinois, have invented a new and Improved Telephone-Transmitter, of which the following is' a full, clear, and exact description.

This invention relates to improvementsl in transmitters for electric telephones; and the object is to provide a transmitter of suitable construction and very sensitive and uniform in its operation.

I will describe a telephone-transmitter eina bodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters Ofreference indicate corresponding parts in all the figures.

Figure 1 is an elevation of a transmitter embodying my invention. Fig. 2 is a section on the line 2 2 of Fig. 1. Fig. 3 isasectio'nal detail showing the carbon tubes and balls connecting Opposite electrodes, and Figs. 4 and 5 are respectively a sectional side elevation and a front elevation Ot' a modification. Referring to the drawings, l designates the front board of the transmitter, 'and secured to the rear side thereof is the diaphragm 2. The diaphragm is secured in place by means of a ring 3 extending around its edge, through which screws 4 pass into the front board, and arranged on the back of the diaphragm is a textile material 5-f-such,for instance, as feltdesigned to damp excessive vibration of the diaphragm. This textile material is held in place by means of a plate 6 at the center of the diaphragm and through which a fastening-screw 7 passes, the said screw also passing through the diaphragm.

Mounted rearward of the diaphragm are two pairs of electrodes 8 9 and 10 l1. Fastening-bolts 12 pass through the head portions of these electrodes and also through a central strip 13 Of insulating material, and the electrodes are suspended from a bolt 13, extended rearward from the front board 1 by means of spring-plates 14 15, connecting, respectively, with the binding-posts 16 17, to which the line-wires are designed to be connected. The electrodes S and 9 are connected by a tubular bridge 18 of carbon, and placed within said tubular bridge is a series of carbon balls 19, designed to increase the number of loose contacts. The electrodes l0 and 11 are also connected together by a tubular bridge 2O of carbon, within which carbon balls 2l are placed. The electrodes extend into the ends of the tubular bridges, and, as plainly indicated in Fig. 3, the openings within the bridges are tapered from the center outwardthat is, the Outer ends are larger in diameter than the inner ends or central portion. rlhis is to cause the balls to roll outward to engage against the beveled ends of the electrodes for yielding pressure. The pressure of the tubes 18 and 20 against the electrodes and also against thediaphragm is regulated by turning the weight 22 on the screw 23, extended from the lower end Of a pressure-pendant 24, which is adjustably attached to a screw-rod 25, extended rearward in the front plate 1. It is to be understood that the normal set of the inner tube 2O is slightly away from the diaphragm or rather slightly away from the end of the screw 7.

In Figs. 4 and 5 I have shown but two electrodes 26 27. These are mounted on springs 14, like the example first described, and in this instance the carbons are bridged by a bunch of platinum wire 2S, attached to the pendant 24.

A transmitter made in accordance with my invention may be used with two or more cells of a battery and it is found very sensitive and powerful.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. In a telephone-transmitter, a diaphragm, electrodes rearward of the diaphragm, a spring-arm supporting the electrodes, a

bridge between the electrodes, and a pres-4 sure-regulator rearward of the electrodes, substantially as specied.

2. A telephone-transmitter, comprising a diaphragm, electrodes rearward of said diaphragm, spring-arms suspending said electrodes, a tubular bridge connecting the electrodes, and carbon balls in said bridge, substantially as specified.

3.V A telephone-transmitter,--comprising a IOS phragm, and electrodes suspended rearward of the diaphragm, substantially as specied.

5. A telephone-transmitter comprising a diaphragm, electrodes rearward of the diaphragm, means for yieldingly supporting the electrodes, a tubular bridge connecting the electrodes, and movable devices in the bridge, zo

substantially as specified.

JOSEPH M. MOORE.

Witnesses:

W. W. WHITLEY, I?. L. NOBLE.

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