US267790A - Telephone system - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

W. A. JACKSON & W. R. COLE. TELEPHONE SYSTEM.

No. 267,790. Patented Nov. 21, 1882.

N, PEYERS. Phowmqa npher. Washington 0.0

(No Model.) 2 Sheets-Sheet 2. W. A. JACKSON & W. R. COLE. TELEPHONE SYSTEM. N0. 267,790. Patented NOV. 21, 1882.

- UNITED STATES PATENT OEFTCE.

WILLIAM A. JACKSON AND WILLIAM COLE, OF DETROIT, MICHIGAN.

TELEPHONE SYSTEM.

" SPECIFICATION forming part of Letters Patent No. 267,790, dated November 21, 1882,

Application filed April 13, 1882. (No model.)

' To all whom it may concern:

Be it known that we, WILLIAM A. J AoKsoN and WILLIAM R. COLE, of Detroit, in the county of Wayne and State of Michigan, haveinvented new and useful Improvements in Telephone Systems; and we do hereby declare that the following is a full, clear, and exact description in the station. In connection with these trunklines and switch-boards is a local-annunciator index, with a double shutter, numbered to correspond with the regular annunciator at the operators board, near which said local an nunciator is placed. in connect-ion with these local anuunciators is a test-wire with battery in circuit. This test-line is so arranged that each operatorthas connection with it, and, by means of a three-way switch, electric signal, and test-cord, caninstantly ascertain ifiany line is in use. The object of these trunk-lines, local annunciators, and test-lines is to allow each operator to get instant control of any subscribers line (if not already in use) without the passage of checks, word of mouth, or in any other way that will create noise or confusion.

In operating our system, when a call is made nections. When the operator finds that he has the line he wants he throws over the lever on his three-way switch, and calls the required subscriber up, and when he has answered, he (the operator) then proceeds to connect such subscriber with the caller on his board. The double-shutter annunciator-index has three sets of local connections-one for making and breaking the communication of the trunk-line with the test-wire, another for making and breaking trunk-line connection with the subscribers line, all as shown in the drawings, and as more fully hereinafter described.

Figure 1 shows a telephone room or station with two switch-boards, Nos. I and II-one on each side of the roomand with their corresponding aununciators, the one marked B being that ordinarily used, and the other one .(marked 1) the additional one used in carrying out my invention. The switch-boards are so arranged that each ,subscribers line which comes in passes through the annunciator and through that part of the switch-board which annunciator to prevent another operator from breaking in uponthe subscriber while talking. The object of the double shutter on the local index is, the first or outside one is for working the local connections, and the other or inside tag is for clearing out when the subscribers are done talking. An operator, when he wishes to secure a subscribers line, drops both of these tags or shutters, which completes connection between the said subscribers line and the trunk-line, and when he has called the subscriber up the inside tag is replaced by the 5 operator at whose board it drops, so that the subscriber, when done talking, can ring 011'. After he has done so, the operator then replaces both tags or shutters into their original position, which restores the lines to their original conditions, ready for another call.

A is a subscribers line coming into the station and passing through the annunciator B and through that part of the switch-board marked (3, and from there through the line D to the local springs E, and through the groundline F to the ground. G are the trunk-lines passing through that part of the switch-board marked H, of which there is one for each subscribers line, each one of which is connected for convenience to four of the sections 0 of the switch-board, from either one of which sections 0 the trunk-line is connected to one of the intervening parallel bars m by a suitable plug, and thence through the local-annunciator indeX I, and thence to the local connection Y, from there through the test-wire K and local battery L, and then to the three-way switch M, where it is connected with button N. The three-way switch has the button 0, which is connected with the line B, running through the magneto-generator Q to the ground. The button marked S is for the telephone. The lever T is connected with the electric signal U, which may be of any of thewell-known forms, an d this in turn is connected with the test-cord V. The local indices I have each two tags, W and X. The tag W is for working the local connections E, J, and Y, while the tag X is for clearing out when the talkers are done. The springs Y form the local connections, one side being connected by the line a to one side of the index-magnets I, while the line b is connected to the subscribers line A and with the local connection J.

Fig. 2 is a perspective view of the local-annunciator index I, and, in connection with a similar view of the same at Fig. 5, shows its construction; and Fig.2,adetail view of the springs. These springs are the connections E J and Y hereinbel'ore referred to, and a shows connection between the magnet and the trunk-line, and a the connection between the magnet and the spring Y, while the opposite spring Y is connected to the test-line. c is a rod terminating a yoke, f, and upon this rod are secured the buttons or cones g, proper means being employed to insulate them from the rod and from each other. WV is the outside tag pivotally secured to the front of the device, and, when upright, is held in position by the hooked arm h, which is actuated by the armature of the magnets. To the lower end of this tagis secured a lever-hook or curved lever, i, which engages with the inner side of the yoke f. VVhenin this position the connections orsprings J and Y are in contact with the cones 9, while the connections of springs J are broken. The inside tag is marked X, and is held in its vertical position by the tag W. When the armature releases the tag \Yits fall is followed by that of the tag X. In falling the tag W impinges against the head of the yoke of the rod 0 and, forcing it backward, breaks the connections Y E and makes connection between the cone and the springs J. After the connection between the subscriberslines has been perfected through the intervening trunk-line,

the operator replaces the tag X in its vertical position, which clears out when the subscribers are through talking. He then, after the subscriber has rung oft, replaces the tagW in its vertical position, engagingit with the hooked arm, when the curved lever at the bottom of said tag engages with the yoke of the rod and, drawing the same forward, breaks connections with the springs J and re-establishes connection with the springs Y E.

Fig. 3 represents the double switch-board composed of the parts marked 0 H, hereinbefore referred to, with which, upon one side, the trunk-lines are connected, and upon the other theoperatingorsubscriberslines. In thedrawings, m m represent a series of metallic bars running the whole length of the switch-boards, and n are other metallic sections interposed between the talking-harem and insulated therefrom, and to these bars a the subscribers lines terminating at that board are connected. 0 are similar sections, connected in series of four connecting-bars for one wire, with which the trun k-lines connect. p are the plug-holes, by means of which and suitable plugs the sections n 0 are connected with the barsm, each trunkline being connected to four of the sections 0 for convenience and to avoid delay from parts of the apparatus being in use by other subscribers. By this construction it will readily be seen that connections can be made instantly by means of the plugs between the subscribers lines and the trunk-lines by placing the plugs in the holes 19, so as to make metallic connection between the sections m and the bars a and 0.

In practice, it the operator at switch-board N6. 1 is asked by No.25 on his board for subscriberNo.75, whois connected directlyto board No. II, he first applies his test to No. on his trunk or local-circuit wire, and if said line 75 is not in use local current will pass through the said trunk-line G to the local index I, No. II, then through springs Y to local-battery wire K, and round to button N, No. I, through switch T, signal U, and cord V, thus completing a test circuit. The above connections have caused the local annunciator I, N 0. II, to drop, and therebyreleased springsYandE and closed springs J. The operator then drops his own local annunciator, No. I, by putting his testplug V into connection with No. 25 trunk-line on his .board No. I, which will cut out the ground-connection and prevent interference. He now switches lever T to the button 0 connected with the generator, and calls up No.75, which being done he connects No. 75 trunkline and No. 25 on his board in the usual manner and' applies his telephone to tell them to go ahead. The operator atboard No. II puts back the inner shutter, X, leaving the outer shutter, W, down during the connection of Nos. 75 and 25, and when the said subscribers ring off it (shutter X) will again drop, which, being the signal that the trunk-line connection is no longer needed, is notice to the operator to replace both shutters, and thereby put the lines in readiness for further calls. The circuit, during the connection of Nos. 75 and 25, is as follows: From subscribers line A, 25, to annunciator B, thence to switch-board No. I at 0, then connect with trunk-line wire 75, thence to annunciator I, No. II, thence to and through springs J to line b, and thence to subscribers line 75.

What we claim as our invention is- 1. In a telephone system, a series of trnnklines corresponding in number to the entering subscribers lines, and connected to two or more sections of every subdivision ofthe system within the station, in combination with the local annnnciator and switching device actuatedthereby, the subscribers talking-bars alternating with said trunk-line sections, and suitable plugs whereby said trunk-lines are connected, substantially as set forth.

2. In a telephone system, and in combination with the trunk and test lines, substantially as described, an electric annunciator-index provided with two tags and local connections, thefirst adapted to work the local springs or connections, and the secondto be used for clearing out, substantially as and for the purposes set forth.

3. The annunciator having double shutters, one for switching and one for clearing out, and local connect-ions consisting of the longitudinally-moving rod provided with suitable contact-pieces, and opposing springs adapted to make or break contact with one or more of the said contact-pieces as the rod is actuated by 3 5 the switching-shutter, substantially as described. I

4. Thecombination,withaswitch-board having the line-circuits and test and local-circuit wires centering therein, of the supplemental an- 0 nunciator I, having switching and clearing-out shutters, and local connections automatically operated by the switching-shutter to connect the desired local circuit with the line-circuits, substantially as shown and described.

5. The supplemental annunciator having switching and clearing-out shutters, and the local connections consisting of the horizontallymovi'ng rod provided with conical contactpieces and opposing fixed contact-sprin gs, said cones being moved between said springs when the rod is actuated by the switching-shutter, substantially as shown and described.

6. The switch-board consisting of the longitudinal bars connected to the subscribers circuits, and the double set of insulated bars permanently connected to the local or switchboard circuits, alternating therewith, and provided with suitable indentations adapted to receive plugs, whereby any desired pair of the local and outside circuits can be readily connected, substantially as described.

WILLIAM A. JACKSON. WILLIAM R. com.

Witnesses:

H. S. SPRAGUE, E. ScULLY.

Images