US293118A - Louis townsblvd - Google Patents

Description

' (No Model.)

' L. TOWNSEND. TELEPHONE G'ALL BELL SWITCH.

Patented, Feb; '5, 1884.

WITNESSES;

' 'ilnrrnn STATES P TENT @rrrcn.

. LOUIS TOVNSEND, OF EVANSVILLE, INDIANA.

TELEPHONE-CALL-BE LL SWITCH.

SPEUIFIGATION forming part of Letters Patent No. 293,118, dated February 5, 1854.

Application filed November 1, 1883. (No model.)

To CLZZ whom it may concern.- Be it known that I, LoUIs TOWNSEND, acitizen of the United States, residing at Evansville, in the county of Vanderburg and State of Indiana, have invented certain new and useful Improvements in Telephone Gall-Bell Switches, of which the following is a specification.

'Myinvention relates to atelephone-call-bell switch and it consists, first, in the combination, with the telephonesupport, of apeculiar torsional-spring tube; secondly, in combining this with and embedding it in the walls of which the boxis composed; and, thirdly, in the peculiar construction of the contact-points, as

will be hereinafter more fully described.

Figure l is a sectionthrough the wall of the telephone-box, and also through thetube containing the torsionspring. Fig. 2 is a View looking in the direction of the arrowm in Fig. 1. Fig. 3 is a View looking in the direction of the arrow y, and Fig. 4 are details of the con tactspring.

In the drawings, A represents a part of the wall of the wooden box or case.

B is the forked telephone-support, which is constructed as a lever, which passes through the wall of the box at right angles, and has con tact-arms a I) upon the inside of the box. This lever is fulcrumed upon an axis that passes through the middle of the wall of the box, and the outer end of said lever is normally held up by a spring, as Iwill now proceed to describe.

0 is a metal tnbehaving a flange, c, at one end. This tube is embedded or inserted in a hole bored in the plane of the wall of the box, and is firmly fastened to the box, so that it cannot turn. \Vithin this tube is another tube, 0, which is smaller and shorter than C, but which projects beyond 0 at the end opposite the flange of the latter. This smaller and shorter tube 0' is firmly connected to the ends of one or more steel torsion wires or springs, (Z d, the other ends ofwhich arefirmlyfastened to a disk, e, corresponding to the flange c of tube 0, and which disk is firmlyfastened to flange c by the same screws that secure the latter to the box. Between the disk 6 and flange 0 is clamped a circuit-wire, f. Upon the end of tube 0, where it projects beyond 0, the telephone-lever support B is rigidly attached, so that the tension of the torsion-spring within serves to hold the outer or forked end of the telephone support up, except when it is depressed. by the weight of the telephone. When the telephone is off the support and the outer end of the lever is up, the arm a on the lower side of the inner end of the lever rests upon a contact-spring, a, and when the telephone is resting on the support and the outer end of the lever is down the contact between arm a and its spring a is broken, and the upper arm, 6, makes contact with the upper contactspring, b. At the same time", also, a stud, c, breaks contact between 0 and 0 These movements being well understood for the purpose of making the necessary circuit-connections, it is not necessary to further explain them. The contact-springs a and I), however, I make in a special formthat is to say, instead of a plain fiat spring I make it in the nature of three spring-tongues, 1 2 3, of which 1 and 3 are bent up so as to be at right angles to 2.. Now, when the arm a or b of the telephone-support makes contact with these springs, said arm squeezes down between the tongues 1 and 3 and rests also flat against 2. By this construction it will be seen that the contact is not a mere touch or impact, which frequently is imperfect by reason of dirt or oxidation, but is arubbing or sliding contact on both side pieces, 1 and 3, as well as a touch against 2. V This, it will be seen, insures the best and surest electrical contact that it ,is'possible to obtain.-

NVith respect to the arrangement of the two tubes 0 and G and the torsion-wire, I would call attention particularly to this advantage, that the telephone-support has always a solid electrical connection with the circuit-wire; and, further, that the devices are so arranged as neither to present an unsightly appearance upon the inside of the box.

For connecting the telephone-support B to the tube 0, a binding-screw, g, is employed. As the tension of the torsion-springs d may vary or decrease so as to failto hold the telephone-support B- to its position, I provide means for increasing the tension of said springs by a new adjustment of the supportB on the tube. For this purpose the end of tube 0 is nicked or slotted at h. Now, when the torsion-springs are to be tightened, the screw 9 is loosened, and a screw-driver is then inserted on the exterior, nor do they take up any room 2 assume in the slot h and turned to tighten'the torsionspring, and when the proper tension is obtained the set-screw gis turned down to rigidly connect the support B to the tube 0 again.

Having thus described my invention, what I claim as new is 1. Atelephone-levcr support combined with the wall of the box or case, and fulcrumed upon a torsion-spring embedded in the wall of the box, as and for the purpose described.

2. The combination, with the telephone-lever support, of the tube 0, the shorter inner tube, 0, and the torsion-spring connecting the two, the said lever-support being fastened to one tube and the outer tube being fastened to the case, as described.

3. The combination of the tube 0, haying flange c, the shorter inner tube, 0, projecting beyond 0, the torsion-wires (Z (Z, connected at one end to one of these tubes and at the other 20 end to the other of said tubes, and the telephone-lever support rigidly fixed to tube C,

as and for the purpose described.

4. A switch or contactspring consisting of three spring-tongues, 1 2 3,the two side tongues 25 of which project at right angles to the middle one, and upon the same side thereof, as described.

I 5. The combination of tube 0, tube 0, with slotted end, the torsion-springs d, and the ad- 30 justable telephone-lever, substantially as described.

LOUIS TOWNSEND. Witnesses:

R. B. PARVIN, R. MOORE.

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