US233526A - William c - Google Patents

Description

(No Model.)

W. G. LOOKWOOD. Gall Attachment for Telephones.

No. 233,526. Patented Oct. 19', I880.

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UNITED STATES WILLIAM G. LOOKWOOD, OF CHICAGO, ILLINOIS, ASSIGNOR TO LOGKWOOD TELEPHONE COMPANY, OF SAME PLACE.

CALL ATTACHMENT FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 233,526, dated October 19, 1880.

Application filed April 24, 1880.

To all whom it may concern Be it known that I, WILLIAM G. LOOKWOOD, a citizen of the United States, residing at Chicago,in the State of Illinois, haveinvented certain new and useful Improvements in Telephones and in Electric Calls for Telephones, of which the following is a specification.

My invention relates to speaking-telephones and electric calls for the same; and the object is to combine the telephone and the call in one instrument having a compartment for the tele phone and a compartment for the call device, arranged compactly together and both operated by a single current of electricity, the circuit being successively broken and closed to operate the call, and the instrument being ready for speaking or hearing through when the circuit is closed.

The call device separately from the telephone is a new device. It consists of an open-tongued diaphragm loosely arranged in a sonorous cup perforated to permit the escape of sound in connection with an electro-magnet in such cup. As the circuitis successively broken and closed, the electro-magnet operates the tongue and open, diaphragm, causing them to vibrate to produce the call-sound. The sound resembles the clicking sound of the ordinary telegraphinstrument, but is louder, being produced on 0 the same principle, but by devices in combination with the electromagnet materially different from those which produce the sound in the telegraph-instrument, and better adapted to produce sound. These devices, in combi- 3 5 nation with the electro-ma-gnet arranged in the cup, and the same combined with the telephone-cup, are illustrated in the accompanying drawings,in which Figure 1 is a longitudinal central section of such combined instrument. Fig. 2 is a front view of the call-cup, showingits perforations; and Fig. 3 is a reverse view of the same cup, showing a side view of the call-diaphragm and its tongue.

Similar letters of reference refer to similar parts throughout the several views.

A is the telephone-cup, with a single coil, a, and electro-magnet a, of soft iron, under the (No model.)

diaphragm B, all constructed and arranged in the usual form.

C is the call-cup having a single coil and electro magnet, o of soft iron, (the magnet being the opposite end of magnet a,) approachand is sprung out at the end opposite to that secured to the diaphragm in the manner shown in Fig. 1. This tongue is made of thin sheetiron the same thickness as the diaphragm, or thereabout. The diaphragm is secured to the perforated end or bottom of cup 0 by a screw, 6, passing loosely through the tongue and diaphragm into the cup at one side, the other side of the diaphragm being left free to vibrate against the adjacent perforated part of the cup. The tongue is brought so near the end of the electro-magnet that the closing of the circuit will cause the tongue to be drawn against the magnet, and by the breaking of the circuit the same will be released and will spring back against the diaphragm, which is likewise, but to a more limited extent,made to vibrate against the adjacent end of the cup.

The magnet-bar is supported and held in position by a partition, F, which separates the telephone-cup A from thecall-cup O. Screws or pegs f, ofthe usual construction, are used to make the wire connections with the instrument, and the current may be made to pass into the instrument at either end, and should pass around or upon the coil first reached in its path, thence to the coilin the opposite cup of the instrument, and thence upon this coil and out to the earth.

If it is desired to increase the power of the instrument by using two electromagnets under each diaphragm in connection with alocal bat tery, this may be done by making the bar a, a with two prongs at each end, being in the shape of two Us with their bases turned toward each other, and connected bya short bar supported on the partition F, thus bringing the bases of the Us against the partition and projecting their pron gs toward the diaphragms,

respectively. When so constructed the outer end of the coil upon one of the spools in cup 0 should be connected with the main line, and the inner end of the same coil should be connected with the outer end of the coil on the spool in cup A, on the same side of the instrument-supposing the prongs otthe double U- shaped bar, before described, to be all in the same planeand the inner end of the wire on the last-named spool with the zinc pole of the local battery, and theinner end of the other coil in cup A should be connected With the copper pole of the local battery and the outer end With the inner end of the coil alongside of the firstnamed coil in cup 0, and the outer end of the coil last named should be connected with the earth-line. With the four spools or coils on the four prongs of the double U-shaped soft iron bar having their ends of Wire thus connected the current will pass from the main line to the first-named coil in cup 0, thence to the coil first named in cup A on the same side of the instrument, thence to the local battery, thence to the other spool in cup A, thence to the last coil in cup 0, and thence to the earth.

Any of the known Ways of alternately breaking and closingthecirouit at the end ofthemain line or elsewhere may be employed to produce the call. I have successfully produced it by simply detaching the main line from its connecting-post f on the instrument and rapidly tapping the post with the metal connectingplug on the end of the line in my hand.

Having thus described my invention, what I clainn, and desire to secure by Letters Patent, is-

A telephone-call consisting of a diaphragm, E, having a tongue, D, in a cup, 0, in combination with an electro-magnet, substantially as and for the purpose specified.

WILLIAM (J. LOOKWOOD.

Witnesses:

JNo. H. WHIPPLE, JAMES C. HOLLAND.

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