US686488A - Telephone-receiver. - Google Patents

Description

Patented Nov. l2, I901.

'w. F. TAYLOR. TELEPHONE RECEIVER.

(Application filed Apr. 25, 1901.)

(No Model.)

UNITED STATES WALTER F. TAYLOR, or BROOKLINE, MASSACHUSETTS, ASSIGNOR TO HOLTZER OABOT ELECTRIC OHUSETTS.

COMPANY, A CORPORATION OF MASSA- TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 686,488, dated. November 12,1901.

Application filed April 25, 1901. Serial No. 57,363. (No model.)

T0 ctZZ whom it may concern:

Be it known that I, WALTER F. TAYLOR, a citizen of Canada, residing in Brookline, county of Norfolk, and State of Massachusetts, have invented an Improvement in Telephone-Receivers, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The present invention relates to a tele' phone-receiver, and is mainly embodied in novel features of construction and arrangement whereby the magnet-poles can be easily and delicately adjusted with relation to the diaphragm, further features of the invention consistin gin a novel construction of said polepieces whereby a better distribution of the magnetic field is obtained and in novel means for fastening the outside terminals to the terminals of the electromagnetic coils in the receiver.

Figure 1 is a longitudinal section of a receiver embodying the invention; Fig. 2, a similar section of the outer shell alone; Fig. 3, a view, partly in section and partly in elevation, of the magnet and its connections apart from the shell; Fig. 4, an end View of the receiver with the earpiece and diaphragm removed; Fig. 5, an end view of the receivershell alone; Fig. 6, a View of the opposite end of the receiver from which the magnet is supported, and Fig. 7 a detail in section of the means for connecting the outer terminals with the terminals of the magnet-coils.

In accordance with the invention the magnet (1 is clamped, as by a screw a to a cupshaped base member I), which surrounds and incloses the rear end of the receiver-shell c,

the said member I) being rotatable with rela-- tion to said shell and not directly fastened thereto. To adjustthe magnet endwise with relation to the diaphragm d, which is held in place in the usual way by means of the earpiece e, the magnet is provided at its upper end with a supporting-plate a having a series of inclined surfaces which fit over and.

receiver-shell c, as best shown in Figs. 2 and o. By rotating the magnet-supporting member 19, therefore, with relation to the shell the plate a will travel along the inclined surfaces 0 thus moving the magnet a longitudinally with relation to the receiver-shell and varying the distance between the pole-pieces a and the diaphragm d.

In order to lock the magnet after the proper adjustment has been attained, the plate a is shown as provided with slots 01., through which extend screws a, which are threaded in the surface of the annular shoulder upon which the plate a rests. The slots a as shown in Fig. 4, are of sufficient length to permit so much rotary movement of the magnet a as may be necessary to effect the desired adjustment.

The terminals of the electromagnetic coils a are connected with rods a which extend upward from screws f which in conjunction with screws f secure in position the plates f,

. to which the outside terminals 9 are arranged to be connected, the screws f being in electrical contact with said plates.

To insure a good electrical connection between the terminals g and the receiver-conductors a the plates fare shown as provided with socket-pieces f having oppositely-disposed openings for the terminals g, and within said sockets are placed blocks f having openings in line with the openings 1", and threaded stems f which extend through suitable openings in the ends of the sockets and are provided with nuts f Each terminal g is passed through the three openings, as shown in Fig. 7, and upon tightening the nut f is drawn into'close electrical contact with the walls of the socket f thus insuring not only a firm mechanical connection, but a good electrical connection.

For the better distribution of the magnetic field the pole-pieces a of the permanent magnet, around which are wound the coils a are shaped, as best shown in Fig. 4:, so that together they approximate a circular outline, the inner sides of the said pole-pieces being substantially straight and parallel to'each other and the outer sides being convex.

I claim 1. In a telephone-receiver, the combination with the shell adapted to support the dia phragm; of a shoulder formed in said shell and provided with a series of inclined surfaces; a magnet provided with a supporting member or plate having inclined surfaces adapted to rest upon the corresponding surfaces in the shell; and means for locking the said magnet when the said plate is in any desired position relative to said inclined surfaces, as set forth.

2. In a telephone-receiver, the combination with the shell; of the magnet connected at one end with a cup shaped base member which closes the end of the shell and is rotatable with relation thereto and at the other end with an annular plate having a series I of inclined surfaces; an annular shoulder formed in the interior of the shell and provided with inclined surfaces corresponding to those of the plate and adapted to receive the said plate; and fastening devices whereby said plate may be secured to or released from said shoulders, as set forth.

3. In a telephone-receiver the combination with the shell; of the magnet connected at one end with a base member which closes the end of the shell, and at the other end an annular plate having a series of inclined surfaces, said magnet having two pole-pieces to receive the coils, the adjacent surfaces of said pole-pieces being substantially straight and parallel to each other, and the non-adjacent surfaces being convex; and an annular shoulder formed in the interior of the shell and provided with inclined surfaces corresponding to those of the plate and adapted to receive the said plate, as set forth.

4. In a telephone-receiver, the combination with the shell; of the magnet connected at one end with a base member which closes the end of the shell, and at the other end with an annular plate having a series of inclined surfaces; an annular shoulder formed in the interior of the shell and provided with inclined surfaces corresponding to those of the plate and adapted to receive the said plate; coilterminals connected with socket-pieces fastened to said base member; openings in the opposite walls of said socket-pieces in alinement with each other; blocks movable in said socket-pieces and provided with corresponding openings; threaded stems for the said blocks projecting through suitable openings in the sockets; and nuts on said threaded stems, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VVAIIIER F. TAYLOR.

Witnesses:

HENRY J. LIVERMORE, NANCY P. FORD.

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