US660124A

US660124A - Telephone system.

Info

Publication number: US660124A
Application number: US778500A
Authority: US
Inventors: Lambert Schmidt
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-03-08
Filing date: 1900-03-08
Publication date: 1900-10-23
Anticipated expiration: 1917-10-23

Description

No. 660,|24. Patented 06f. 23,1900.

. L.. SGHMIDT. TELEPHONE SYST'EM.

' -lApplication led In. 8, 1900.) (No Model.) v 3 Shoots-Shoot I.

` No. 660,124. Patented oct. 23. |900.

l L. scHmmT. i

TELEPHNE SYSTEM.

(Application filed Hu. B, 1900.)

(No Model.) 3 Sheets-Sheet 2.

ll/ 1 i/ mais w /fzc {Mw M No. 660,|24. v Patented 00L 23, |900.v

L. SCHMIDT. V

TELEPHONE SYSTEM.

(Application lled Mar. 8, 1900.)

cnn model.) 3 sheets-sheet s.

UNITED STATES..

PATENT rricn.

LAMBERT SCHMIDT, OF WEEHAWKEN, NEW JERSEY.

.TELEPHONE SYSTEM.

SPECIFICTIO forming part of Letters Patent No. 6O,124, dated ctober .f2/, 1900. Application filed MarohSVlQOO. Serial No. 7,785; (No model.)

T0 all whom t may concern:

Be it known that I, LAMBERT SCHMIDT, a citizen of the United States, residing in Weehawken, county of Hudson, State of New Jersey, haveinvented certain new and useful lm'- provements in Telephone Systems, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to intercommunicating telephone systems in which each party calling makes connection at his own station or instrument with the station or instrument of the party called. In such systems there are at each station open connections for the several lines to the other stations or instruments in the system. The party calling commonly makes the desired connection by the insertion of the plug at the proper point. It has also been proposed to arrange the series of contacts or terminals of the several lines so that a movable contact or switch-arm may sweep over the same, such switch-arm being held by a suitable detent on the desired 'contact or terminal and being released by the hanging up of the receiver, so that it may return to its initial position.

This invention is more particularly concerned with automatic switches of the class to which that just referred to belongs; and it has for its object to overcome certain difficulties which are developed in the practical `use of such automatic switches as that referred to. Thus it has been sought to provide a device which can be completely inclosed, so that the contacts shall be protected from dust. It has also been sought to provide a device which shall be free from the diiculties incident to the use of a single switch-arm sweeping over a series of contacts, it having been found difficult to give such an arm a sufficient bearing upon the iiXed contact or terminal without interfering with its freedom of move- 'ment to such an extent as to brender its return to initial position when released somewhat uncertain.

A further7 object has been to facilitate the work of making the necessary connections when the instrument is set up.

The invention will be more fully described and its nature explained hereinafter with refvagainst the force of the spring a. -nary hook-lever D, which is extended through erence to the accompanying drawings, in which-- y 4 Figure 1 is a perspective view of a calling and receiving instrument or telephone set to which the improved automatic switch is applied. Fig. 2 is a plan view of the improved switch. adapted for use in a single-wire system, the casing being shown in section. Fig. 3 is a front elevation of the same with the casing in section. Fig. 4 is a section on the plane indicated by the broken line 4 4 of Fig. 3. Fig. 5 is a diagram illustrating the electrical connection. Fig. 6 is a view similar to Fig. 2, but illustrating the application of the switch to a two-wire system. Fig. '7 is a detail view of the construction shown in Fig. 6, illustrating the manner in which the connections are formed. Fig. 8 is a detail section on the plane indicated by the broken line 8 8 of Fig. 6, and Fig..9 is a diagram illustrating the electrical connections when the switch is applied to a two-wire system.

In the embodiment of the invention represented in the drawings a shaft or drum Ais mounted in the ends of suitable bearings in the supporting-frame B and is provided outside of the casing C, which entirely incloses the shaft or drum and other parts hereinafter whatever position of rotation it has been set An .ordithe casing C and is adapted to support the usual receiver R, rests upon the tail ofthe pawl a2, so that when the receiver, is applied to the hook,as usual when the telephonie communication has been completed, its added weight acting in opposition to the'pawlI-'spring will disengage the pawl from the ratchetwheel and so permit the shaft orv drum to be rotated backward to its'initial position by the spring a. At a convenient point on the shaft or drum is secured an indicator-wheel A3, having a broad rim A4, upon which are formed IOO or secured the numbers or other designations of the several stations of the system, such numbers or other designations being visible one at a time through a sight-opening c in the casing C. Secured to the shaft or drum A and disposed spirally about the same are pins a, which correspond, respectively, to the several stations of the system. The relative arrangement of the several pins, the several teeth of the ratchet-wheel A2, and the several numbers on the indicator-wheel is such that when any number is visible at the sight-opening the corresponding tooth of the ratchetwheel is then engaged by a pawl and the corresponding pin a is then in operative position. As shown in Fig. 2, the indicator-wheel may be provided with a stop a3, projecting inward from the rim A4, io limit the backward rotation of the shaft and determine the initial position of the parts by engagement with a iixed stop b.

Allof the parts above referred to are found in both constructions represented in the drawings-namely, the construction which is adapted for application to a single-wire system and the construction which is adapted for application to a two-wire systemand the operation of such parts as far as described is the same in both cases. In the single-wire system, however, the circuit-closing pins ct are themselves included in the circuit, while in the two-wire system the circuit-closing pins are not included in the circuit, but operate to close the circuit between two separated contacts. It will be obvious that the invention is substantially the same in both cases so far as concerns the structure already referred to. Such differences as characterize the two applications of the switch will now be pointed out.

Referring first to the arrangement shown in Figs. 2, 3, and 4, it will be observed that the shaft or drum A is connected in the calling-circuit and that each of the pins a thereon is likewise in the calling-circuit. Supported in convenient position adjacent to the shaft or drum Aare spring contacts or terminals E, each one of which is insulated from the others and from the frame and is connected electrically with the corresponding callingwire. These contacts or terminals are preferably secured alternately to opposite sides of the supporting-frame. By this arrangement I sec nre greater com pactness than would be possible if the contacts or terminals were all arranged on one side of the frame. It will therefore be seen that whenever the shaft or drum Ais rotated to bring a certain station-indicator to the sight-opening the corresponding circuit-closing pin a will be brought into contact with the corresponding spring contact or terminal E and will be held there by the engagement of the pawl with the corresponding tooth of theratchet-wheel. The first act of the party calling is of course to remove the receiver from the hook-lever,

and transmitter. `is operated to throw current from the ringe which leaves the pawl free to engage the ratchet-wheel, and the next actis to estab lish connection with the desired line by the rotation of the shaft or drum A. The release of the hookelever breaks the circuit through the bell or other signal S and completes the circuit through the circuit-closing device already referred to and the receiver The usual push-button P ing-battery on the line for the purpose of calling the attention of the party whose line `has been brought into circuit, and conversation is then carried on. When communication has been completed, the receiver is hung again upon the hook-lever, which restores the line to its normal condition in readiness for a call and releases the rotating switch or shaft A to be returned immediately by the springe to its initial position.

In the application of the switch to a twoline or all metallic system (illustrated in Figs, 7, 8) and 9, the pins ct on the shaft or drum A operate to close the desired circuit, but do not themselves form parts of such circuit. Secured upon the frame in positions corresponding with the several circuit-closing pins u, on the Shaft or drum are double pairs of contacts or terminals, each pair consisting of an upper contact e and a lower contact e2, the upper contact of each pair being connected with the corresponding leg of the corresponding line, while the lower contact of each pair is connected with the corresponding leg of the home Wire of the station. The pin a has a head sufliciently broad to engage both of the lower contacts and lift them against the upper contacts, thereby establishing connection between the home line and the particular line desired. The operation of the push-button P throws current on the ringing-circuit of the station called, as already described with reference to the arrangement shown in Fig. 5, and in other respects, except as hereinbefore indicated,the operation of the arrangement shown in Fig. 9 is substantially the same as that shown in Fig. 5 and does not require further explanation herein.

It will be obvious that the details of construction and arrangement may be varied without departing from the spirit of the in vention.

I claim as my inventionl. In an automatic switch, the combination with a supporting-frame, of a shaft or drum, having a series of circuit-closers arranged thereon, journaled in the ends of said frame, a series of pairs of contacts carried by the Sides of said frame, one of the contacts of each of said pairs extending' into the path of the circuitfclosers, alternate pairs of contacts being carried by opposite sides of the frame, means for rotating the shaft or drum in one direction, a detent engaging the shaft or drum to hold it with one of said circuit-closers in IOO IZO

position to press together one of the pairs of contacts, and means for releasing the detent; substantially as described.

2. In an automatic switch, the combination with a supporting-'frame of a shaft or drum, having a series of circuit-closers arranged thereon, journaled in the ends of said frame,

v a series of pairs of contacts each consisting of two terminals carried by the sides of said frame, the terminals of one of the contacts of each of said pairs extending into the path of the circuit-closers, alternate pairs of contacts being carried by opposite sides of the frame, means for rotating the shaft or drum in one direction,a detent engaging the shaft or drum to hold it with the terminals of each of one of said circuit-closers in position to press togethera pair of contacts, and means for releasing the detent; substantially as described.

3. In an automatic switch, the combination with a supporting-frame, of a shaft or drum having a series of circuit-closers arranged thereon, journaled in the ends of said frame, a series of contacts carried by the sides of said frame and extending into the path of the circuit-closers, alternate contacts being carried by opposite sides of the frame, lan indicatorwheel carried by said shaft or drum between the ends of the supporting-frame and pro- 'with a supporting-frame, of a shaft or drum v having a series of circuit-closers arranged thereon, a series of contacts carried by the sides of said frame and extending into the path of the circuit-closers, an indicator-wheel having a rim adapted to bear designating characters, a stop extending inward from said rim, means for rotating the shaft or drum in one direction, a detent engaging the shaft or drum to hold it with one of said circuit-closers against one of said contacts, means for releasing the detent, and a fixed stop in the path of the stop carried by the indicator-wheel; substantially as described.

This specification signed and witnessed this 28th day of February, A. D. 1900.

LAMBERT SCHMIDT. In presence of- ANTHONY N. JESBERA, LOUIS R. MOORE.