US287490A - Telephone-transmitter - Google Patents

Description

(No Model.)

B. L. WILSON.

TELEPHONE TRANSMITTER.

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EDWARD L. WILSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE AMERICAN BELL TELEPHONE COMPANY, OF MASSACHUSETTS.

TELEPHONE-TRANSMITTER.

SPECIFICATION formingpart of Letters PatentNo. 287,490, dated October 50, 1883.

Application filed June 4, 1883. (No model.) d

To all whom it may concern.-

Be it known that I, EDWARD L. WILsoN, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in TelephoneTransmitters, of which the following is a specification.

My invention is an improvement in the construction of battery-telephones such as are in common use as transmitters.

It is well known that owing to the delicacy of many of the instruments which are used in the transmission and reproduction of articulate speech they require careful attention and supervision, and in carrying this out it is frequently essential that the respective parts have to be taken from one another and cleaned or repaired severally.

The object of this invention is to so construct such instruments that by avery simple operation they may be taken apart for inspection and repairs, and upon the completion of such inspection be put together again, by persons unskilled in electromechanical science, and without the intermediation of special tools.

To this end it consists in certain specific details of construction, which co-operate with one another, so that when all the parts are in place they are mutually held together, and whereby if one of the said parts be severed the entire combination is disintegrated.

In the drawings which illustrate and form a part of this specification I show a Blake transmitter and a modification thereof constructed in accordance with my invention. Figure 1 is a rear view of the said modification; Fig. 2, a side elevation, and Figs. 3 and 4 details thereof. Fig. 5 is a rear view of the working parts of a Blake transmitter provided with my invention, and Fig. 6 a sectional elevation of the same. I

In Figs. 1 and 2, A is a metal bed-plate or ring-seat, in which lies loosely a vibratory diaphragm, B. Fastened by screws (Z to the top and bottom part of the bed-plate-are metal standards 0 and O. A bracket, a, projects from the upper standard, 0, and at its outer end is forked, as shown in Fig. 1, the forked end being bent under and inwardly. The upper standard also has a projecting lug, c, for a purpose which will hereinafter appear. A metal bar, an edge View of which is shown in Fig. 3, is provided at its upper end with an axis, Z, adapted to fit into the bend of the light metallic bracket a, whereby the bar may be suspended therefrom. A little below this axis the bar is also provided with an inwardly-proj ecting lug, c, which, when the said bar is suspended by its axis, presses against the stand.

The lower standard, 0, is slotted,

ard-lug c.

and a bolt, 6, is pivoted in the slot by a pivot-.

The diaphragm B carries'one of the contactelectrodes, F, at its center, and the other or complementary electrode, E, is attached to a spring, f, the free end of which is clamped by the lugs c and c. The spring is thus held in place with the center of the electrode E in contact with the diaphragm-electrode F. The

initial pressure between the two electrodes is regulated or adjusted by an auxiliary spring, 0, which is riveted or solderedtothe suspendingspring f. This is bent down, as shown in Figs. 4 and 2, and treads backwardly. 1f unbiased, it would extend backward so far as to strike the bar D; but it is capable of being com;'

pressed by sliding the abutment h between-it and the said bar, the proper adjustment of the initial pressure being reached when the end of the spring rests about the middle of the abutment, as shown in Fig. 2.

To put the several parts together it is only necessary to hold the electrode-spring f in place, to hook the axis 1 in the bend b, to hold down the lower forked end of the bar D, and then to turn the bolt 43 up on its pivot into the said forked end, screwing the nut j down thereon, asshown. Per contra, todismember the instrument, the nut j is to be unscrewed and the bolt 1' bent down, thus disengaging the bar D, which may then be unhooked and severed from the bent arm a; the spring f and electrode E may now be released and drop out 5 it may then be repaired or be repolished 5 and the other electrode whiehvis fixed upon the diaphragm is also thus made'accessible.

The features which I have described may readily be applied to the standard Blake transmitter, as I show in Figs. 5 and 6. In those figures, Bis the. diaphragm, and G' the ring seat or frame inwhich it is'placed. It is maintained in placeby the clamp I and the damping-spring H. The upper part of the ring-seat G projects backwardly from the diaphragm, terminating in the hook m. In this hook, which is also forked, as shown more clearly in Fig. 5, the axis b of the bar D is suspended. The lower part of the bar D is forked, asin the foregoing description, and embraces the bolt 1', a

which is pivoted to the lower part of the ringseat. As in the ordinary Blake transmitter, a platinum electrode, F, is carried on the end of a light spring, 6, and a carbon-button electrode, E, in contact with the said platinum, is suspended by-a heavierspring, f. The light spring e isinsulated from the ring-seat G bythe non-conducting block A: Thetwo springs are insulatedfrom one another by the nonconducting mass q,.while.between the lugc of.

the'bar Dand the-springf the thirdnon-conducting block, 19, is interposed. .All of these non-conducting blocks yare supported in i a frame, 0. The lug. c presses upon these blocks andholds themfirmly together, with the ends of the springs. between them; The normal pressure of. the electrodes is regulatedv by the screw 9. In both of these cases whichI have described the two electrodesare of course suitably connected with the circuitwires leading to and from a battery, and in some cases through the primaryeircuit ofan inductioncoil; but asthe electrical connections'have no bearing upon my invention, I have not th ought it necessary to show and. describe them.

What I claim as my invention is- 1. The combination,;in a battery-telephone,

with a diaphragm, a; ring-seat: therefor, and

ed to compress and hold one or more springeleetrodes, and an adjusting device attached to the lever, substantially as and for the purposes described.

2. The combination, in abattery-telephone, of the hereinbef re-described mechanism, consisting of the hooked bracket m, the lever D,.

having an axis, b, adapted to be suspended in the said hook-bracket, and furnished with the compressing-lug c and the adjusting-screw g,

and its supporting-frame, of thehinged bar on lever, the electrode spring or springs held in place by being clamped between said bar or lever and a stationary part of the frame, and

means for detachably securing the free end of said bar or lever to said frame, substantially as described;

4. The combination, with the diaphragm, electrode, and spring supporting the same, of a-sliding. wedgeshaped adjusting-piece for regulating the pressure of said spring, sub stantially as described.

is released the said parts may at once be removed, substantially as described.

In testimony whereof I have signed my namev to this specification, in the presence of two subscribing witnesses, this 1st day of June, 1883.

EDWARD L. WILSON. Witnesses:

Gno. WILLrs PIERCE, J. H. CHEEVER.

7 5. The combination of the frame, diaphragm, .bar or lever hinged at the back of said frame, eleetrodespring, adjusting-piece on said bar

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