USRE12240E - Reissued july - Google Patents

Description

No.12,240. REISSUEI) JULY 19, 1904.

A. K. ANDRIANO & H. HERBSTRITT. INDIVIDUAL TELEPHONE SWITCH AND LOOK-OUT MECHANISM FOR INTI RCONNECTING- LINES.

APPLICATION FILED JUNE 15, I904 4 SHEBTSSHEET 1.

- I ZNVENTOR s:

' REISSUED JULY 19, 1904. A. K. ANDRIANO 6: H. HERBSTRITT.

INDIVIDUAL TELEPHONE SWITCH AND LOOK-OUT MECHANISM FOR INTERGONNEUTING LINES.

' APPLICATION FILED Jun 15, 1904.-

T: 5; (440 v 4 SHEETS-sum 2. 7 3358 vg1 I (ado. Af/omey REISSUED'JULY 19, 1904." A. K. ANDRIANO & H. HERBSTRITT. I

INDIVIDUAL TELEPHONE SWITCH AND LOCK-OUT MECHANISM FOR INTERGONNEGTING LINES..

APPLIUATION FILED JUHE 15, 1904.

[NVENTORA UNITED STATES Reissued July 19, 1 904.

PATENT OFFICE.

ALBERT KOCH ANDRIANO, OF SAN FRANCISCO, CALIFORNIA, AND HERMANN HERBSTRITT, OF NEWT YORK, N. Y., ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE DIRECT-LINE GENERAL TELE- PHONE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPO- RATION OF CALIFORNIA.

lNDlVIDUAL TELEPHONE- SWITCH ANP LOCK-OUT MECHANISM FOR INTERCONNECTING LINES.

SPECIFICATION forming part of Reissued Letters Pateuit No. 12,240, dated July 19, 1904.- Original No- 69l,229, dated January 14, 1902. Application for reissue filed June 15, 1904. Serial No. 212,735.

To all whom it may concern.-

Be it known that we, ALBERT KOCH ANDRP- ANO, a citizen of the United States, residing in the city and county of San Francisco, State of California, and HERMANN HERBSTRITT, a subject of the Emperor of Germany, residing in the city and county of New York and State of New York, have invented new and useful Improvements in Individual Telephone- Switch and Lock-Out Mechanism for Interconnecting Lines, of which the following is a specification.

This invention relates to improvements made in switch devices of,the class or description that are adapted to give individual connection between the stations without the assistance a central oflice and an operator. These improvements consist in switching mechanism of novel construction in which provision is made for locking the movable contact and preventing it from being moved after the receiver has been taken down for use,

also in novel locking-out means controlling the local or primary circuit at each station and holding the same disconnected from the main line, so that the local circuit of the sta'- tion cannot get on the line of another station that is already inuse.

The invention includes also certain novel, construction and combination of portable switch-stand, switching device, and lockingout mechanism, as hereinafter fully described,

- and pointed out in the claims at the end of this specification.

, The object of these improvements is mainly to prevent a person at a station from getting on the line and listening to the conversation taking place between two other connected stations. The novel features and the general construction and combination thereof to produce an improved ,portable desk-telephone and switch-stand are explained at length in the following description, in which reference is hadto the accompanying drawings, forming part thereof. J

Figure 1 is an elevation of adesk-te'lephone embodying our invention and comprising a switch-stand and a support for the receiver and the transmitter. taken from the right side of Fig. 1 with the receiver on the hook and the transmitter re- Fig. 2 is an elevation moved, part of the frame or body of the instrument being broken away. Fig. 3 is a top view of the switching mechanism located in the base of the stand.- Fig. 4 is a top view of the base-block, the stationary contacts, the

movable contact, and the mechanism for setting and looking it. Fig. 5 is a top view, on"

switch-dial partly broken away to disclose parts inside. Fig. 8 is a top view of the parts pertaining to the locking mechanism, the top plate of the frame being partly broken away. Fig. 9 is an elevation of Fig. 8 with the addition Ofparts of the locking-out mechanism that are omitted from Fig. 8. Fig. 10 is a detail in perspective'o'f the switch-pieceand (slide-plate of the locking mechanism. Figs. 11 and 12 are side elevations of the electromagnct and connected parts of thelocking j out mechanism, Fig. 11 representing the relative position of the parts when a current has .been passed through the magnet and the latter has attracted the locking-lever and Fig. 12 illustrating the normal position of the .parts before the magnet has drawn away the locking-lever and the parts are in position to .lock out the talking-circuit of the station. Fig. 13 is a diagrammaticrepresentation of .the' circuits and connections between three stations.

The switching mechanism at each station contains aplurality of stationary contacts a a, corresponding in number with the stations in the system, and amovable arm 6, carrying a contact through which" the local circuit of .the receiver and transmitter'is connected with another selected station setting the mov- I to position by means of the setting-shaft (9,

direction.

able contact to the proper (stationary contact of the switch. The arm 71 of the switch is set geared into the arm by the spur-wheel-h on the. shaft 2- on which the arm is fixethand a pinion '1 fast on the setting-shaft. The annular dial cover the stationary contact is connected rigidly with the shaft 2 by arms a e so as to move uniformly with the arm I) and show by the switching-numbers on its face the position of the arm with reference to any selected contact a. V hen the number on the dial corresponding to the required station is exposed to view through the sight-opening (f in the stand, the arm 71 will be in position upon the proper contact in the circle beneath the dial. In that position the arm 7) is locked after the receiver is once taken down, and, on the other hand, the arm 7) is released and set back to the home contact by the act of hanging up the receiver. The parts of the locking mechanism by which these two operations are effected by taking down and hang- 'ing up the receiver are shown inFigs. 7, 8,

and 9. x

The dog a, working on a pivot s, when set in contact with the teeth of the spur-gear It acts to hold the gear fromturning in either A second pivoted dog 79, mounted on an axle or pivot a, prevents the gear from turning backward under the reaction of the coiled spring m that returns the arm 7) of the switch whenthe first-mentioned dog is set clear of the gear. Theimovable arm of the switch is thus held stationary when the dog w is thrown into the gear, and it is also prevented from returning to the home contact of .the station as long as the dog 72 is set against the gear, vwhile the dog n is held away.

vThe spring 18 presses the two dogs n p When a switch is made to the line of another station, the locking-dog 01 must be set away from the gear and only the dog 7) allowed to act, and when the switch is to be thrown 011' after the talking is done the gear must be released by the dog 7). These movements of the two dogs are effected automatically from the rising and falling movements of the arm of thetelephone-hook through the following mechanism, the principal parts of which are the rocking switcl'inece 7, the vertically-movable plate 14, and the push-rod 22, attached at the upper end to the arm 23 of the telephonehook and its lower end bearing on the plate 14. ()n the switch-piece, which is set to turn loosely on the pivots 6 6, are two oppositely? diverging arms 8 9, extending over the dogs a 7) in position to engage stop-pins 11 12 on the dogs, so that the s\vit ch pi(. ce rocking in one direction will press back one dog and in the other direction it will throw the other dog rlear of the gear. A third arm' or member W on the back of theswitclrpipce extending through an inclined slot 16 in the depending '23 of the telephone-hook at 22".

end of the plate 14: connects that part with .top 0t theplate l i is fitted to slide on a fixed postQl. on the frame, and the lower end of the l'JllSllrIOKl 22, fitting over the same post, rests on the top end of the tube 20, the upper end of the push-rod being loosely attached to the arm By virtue of this constructionrthe weight of the receiver when that instrument is hanging on the hook depresses the plate 1 1, and by compressing a coiled spring 70,- intcrposed between the top plate ofjthe frame and the piece 14, it holds the switch-piece? in such position that the dog a is held away from the gear and only the dog p'will act; but on removing the receiver from the hook the coiled spring k. raises the plate 14 and the upward movement of that piece turns back the switchpiece and throws the locking-dog 91- into the gear. The parts are so adjusted that the mo"- able contact 7) can be moved frompoint to point around the circle of contacts a to make connection with another line as long as the receiver is left on the'hook. In that position of the two dogs last mentioned,'tl 1erefore, the movable contact 6 can be moved oif its home contact for switching to the line of another station. i V

In connection with the dog 17, operating as before mentioned, provision is made for holding the dog out of the teeth o't'ithe gear in the return movement of the contactb until the same has completed its throw back to the home contact; otherwise the gear It would be caught and held by the dog 71 as soon as the plate 14 was depressed and the switch-piece 7 moved by the act of hanging the receiver on the hook and before the movable contact 7) had time to complete its return movement. The dog 39 is controlled at such time therefore by a latch-piece comprising an arm't, pivoted at e on the frame and having a shoulder t on the free end, which by engaging a stop-pin 12 on the dog 7) in one position of the arm holds the dog 7) away from the gear 71 but when set away from the stop-pin it allows the dog to engage the gear. A spring 19 holds the latch t in position to engage the stop 12", and a stop on the top face of the gear it throws off the latch from the dog 72 by striking and pressing back the latch as the movable contact 7) completes its returnmovement. When thus released, the-dog 7) is in position ready to hold thegear from being turned back b the reaction of the sprin n when the contact 7) is again moved to make a switch, while the other dog, 92, is held awa from the gear until the switch has been made trical connection and aclosed circuit with another station is controlledthrough the operations of switching and ringing operates to hold the local or primary circuit of the station normally open or disconnected and'to restore or put the circuit in condition for use by the act of pressing the. ringing-key, This locking-out means is operated electrically through or over the line completed between the two stations through the switch and the ringing or calling circuit set up at such time between the two stations. It is controlled by and depends also for its operation, first, on the line between the two stations being clear, and, secondly, on the receiver being on the hook. This locking-out means comprises, first, circu it-closing contacts 26 27in the transmitting and receiving circuit of the station arranged on oppositesides of the movable plate 14 and by contact with that part in its rising movement making a metallic connection and closingthe local circuit at that point; secondly, an arm 28.'carried by and projecting horizontally outward from the movable plate 14; thirdly, a locking-out lever 30, having a shoulder 33, that when set over and in line with the arm 28 will hold down the plate 14' by engaging that arm, and thereby prevent that part 14 from touching the contacts 26 27,

and, fourthly, an ele ctromagnet 31, having its windings connected in the main line and the ringing-circuit. The magnet 31 is a single spool with double windings constituting two separate coils, one of which is connected through the wires 52 53 in the line-Wire that forms one side of the circuit completed for talking between two stations, while the other coil is connected by the wires 50 51 into the bell-circuit. The arm 28 is secured to the movable platel4, and the locking-out lever- 30 is pivoted at 32 in close relation to the pole of the magnet 31, to which it is attracted when a current is passed through the magnet. A. spring 34 on the pivot of the lever holds that part normally away from the pole of the magnet. Such is the position of the parts as long as the receiver is left on the hook; but on removing it before the magnet has attracted the lever'30 the arm 28 will be caught by the shoulder 33, and being unable to rise higher than that. point the movable plate 14 cannot touch the contacts 26 27, and the circuit will remain broken or open at these contacts. By passing a current through the magnet 31, however, the locking-out lever 30 is drawn out of line with the arm 28, thus allowing the plate 14 to rise to its full extent and touch the contacts 26 27. N Av circuit through the magnet is completed when the ringing-key 34 is pressed to call the'station ringing-circuit.

at the other end of the line, so that the magnets 31 at both stations will be energized, and

the contacts 26 27 at stations will be closed when the receivers are taken from the hook, thus putting the circuits of both stations in operative condition by the act of call ing up one station from the other over the As before stated, these conditions require the receiving instrument at the called station to be at rest on the telephone-hook and the station to be disconnected from. the line of any other station, for should the conditions be otherwise than those mentioned' the magnet 31 cannot be energized, because it can get no current from the battery Y, and the locking-out lever 30 will remain in operative position.

hen one station is properly connected with another station through the switch, a calling-circuit will be completed over that one of the lines T which connects the two stations at the time and through the bell at the called station and the battery Y on the ringing-circuit and the ringing-key at the calling-stir tion. The bell at the called station will ring then at the moment that the circuit is closed at the ringing key 34 of the calling-station, and at the same time the current will pass through that coil of the magnet at the calling-station which is connected directly to the line-wire W,

running to the battery Y. At the opposite station, on the other hand, the current will pass through that one of the'coils of its magnet 31 which is connected into the lineW through the bell E, because the remaining coil of the magnet at the called station which is connected into the lines T through the frame and the switch is disconnected from the circuit at the ringingkey 34. The circuit coinpleted at such time will be traced from the diagram Fig. 13, as follows: Starting from the back-stop of the ringing-key 34 at station No. 3 the circuit is carried over the wire 58 to the frame of the instrument, thence through the movable contact b, which has been placed on the contact 2, that forms the terminal of the line connecting with station N0. 2, and thence out over the lineto the home contact'at station No. 2, where the movable contact is standing in its normal position of rest. At that point the circuit is carried by wires and connections 56, 51, and 50 to one side of the line W, running to the ringing battery, and thence throughthat battery Y and into station No. 3 over the wires and connections 53 52 at that station, Where the circuit is completed when the front stop of the key 34 touches the-backstop. It will be seen that this circuit carries the current through that one of the coils of the magnet which is connected at station No. 2 into the conductors 51 50 between the bell E and the switchcontacts. At the callingstation No. 3, on the contrary, the current passes through that coil of the magnet which at that station is connected directly into the ringing-battery line by the conductor 53 and to the front stop of the ringing-key Si by the connection At the instant that it is at tracted by its magnet the lever 30 is caught and is held back by a catch 38, loosely pivol' l at39 at the back of theinagnet and having a notch 40, that catches a pin 33 on the lever 30 as the catch 38 drops. The function of this catch is to hold backthe locking-out lever after the current ceases to act on the magnet and prevent the lever from moving back before the arm 28 has had time to clear the shoulder 33. I

The outer end, of the catch 38 extends over and lies in the path of the arm 28, so as to be struck and thrown off the pin 33 by the upward movement of the arm 2-8 as that 'part is elevated. bythc movable plate 14L.

Another means actuated from the movement of the loc'lqingalo'g y) is also provided for throwing oil the catch at the proper time, so that the locking-out lever shall be released and caused to act with certainty if any at tempt be made to move the switch of a sta tion over its switch-points 1/ to get on another line already in use after the locking-out lever at the station has once been attracted by the magnet and before the switch I has been returned to its normal position by hanging up the receiver. This additional means consists of a draw-rod i1, attached to the curved end of the catch 38 and having on the front end a hook 42, which by'cngagingan arm 43 on the axle or pivot .v of the dog p is drawn forward as the dog is moved.

Bearing for the pivots s, .v, and s are provided in ni frame-i' and..the arm 43 on the end 'of the pivot x lies closely to the top plate 0:. p

Provision is made for opening the ringingcircuit to cut out the bell after connection has been made and the line is in condition for talking. This is efl'ected in the well-known manner through the mediuln of contactsprings 55, plaeed'in the conductors 51 56, and a circuit-closing piece 55", carried by the movable plate 1% and insulated from it. As long as the latter is held down by the weight of the receiver on the hook the pin 55" connects the two springs 55 and holds the bellcircuit closed at that point; but on taking down the receiver for use the plate 14 rises and opening the circuit at the point cuts out the bell.

In operating this s\\'itching mechanism it is necessary to set the switch to the desired station before taking the receiver from the book, because the gear of the setting mechanism is locked and cannot be moved either forward or backward after the receiver is removed, and after the plate 14 is relieved of the weight of the receiver and allowed to rise it is held away from the contacts 2G 27 and cannot act to close the circuit unless the I atter,vcn-rrent can act on the magnets. i .l l the station being i5 and the line \V.

only when the switches I) at both stations are 1 callcdis not already in use the same current that rings the bell also energizes both magnets, .as already explained; but should the station be in use at..the time there will be no circuit through the bell nor through the magnets 31, because the ringing-circuit is opened whenever the recciver is taken down for use.

Should a party at any station after having set his switch to the line of another station already in use take his receiver from its hook in an attempt to listen on the line, the movable plate 14 will be caught by the lockingout lever 30 before it touches the contacts 26 i 27 in the talking-circuit. At such time also the movable arm 7 of the switch will be held by the dog 12, which comes into play as soon as the plate 14 rises, and the switch h cannot 1be iilovcd until the receiver is returned to the The talking-circuit between two stations, as stations Nos. 2 and 3 in the diagram, will be traced-as follows: At station No. 3, as well as at the opposite station N o. 2, connected through the switches l) and the line, as already described, the local or primary circuit is complcted from one side of the battery-4:9, the transmitter Afand the connection 57 to the contact 26 and thence through the frame, the connection 59, and the primary 48 of the in duction-coil into the opposite side of the bat tery, the circuit being completed as soon as the receiver is taken down. Starting from the lHL llJCtiUllCOil at station No. 3 the circuit connecting the two stations and including the two receivers and both induction-coils is carried from the secondary 47 through the connections 45 t6 ofthe receiver B and the contact 27 and thence to the arm 7) of the switch, which is in metallic contact or connection with the plate 14, and through the switch and out over the line T, running to the other station; If the switch at that station be standing on its home contact, the circuit is carried through that part and the frame to the plate 14 Mud thence through the contact 27, the conductors in 45, and the receiver 6 to the secondary 47 of the induction-coil at station No. 2. As the secondaries of all the coils are connected to a common line \V, for which one of the linewires of the ringing-battery is employed, it 'will be seen that the circuit between the two stations is finally completed over the wires These conditions obtain intheir proper positions and the plate 14 is allowed to rise.

Referring to the operation of the plate 14, it will be obvious that it'must have a suflicient extent of downward movement to act on the switch-piece 7 when it is arrested by the lever 30 and prevented from rising to its highest point, as well as when it is allowed to rise and touclrthe contacts 26 27. Some means also is required to hold back the lever 30 after the magnet ceases to act, because the partyat the calling-station would otherwise be compelled to hold down his ringing-key until the receivers at both their hooks. I,

Having thus fully described our invention,

stations are removed .from

what we claim asnew therein, and desire to.

secure/by Letters Patent, is-

comprising a plurality of stationary line-contacts, a movable contact adapted to be setin operative relation to a selected one of the the combination with a plurality of line-contacts and a movable contact adapted to connect the subscribers talking-circuit with a given line through the selected line-contact; of a locking device controlling the movable contact and itself actuated by the telephone-hook to lock the movable contact when the receiver is removed from the hook and to prevent the movable contact from being moved out of position until the receiver is replaced on its hook.

3. The combination, switching mechanism having a plurality of stationary contacts and a movable contact; of a locking device adapted to lock the movable contact andprevent it from being ,movedin either direction after the receiver is removed from the telephone-hook, and to release the movable contact when the receiver is replaced.

4. In combination, a plurality of line-contacts, a movable contact connecting the subscribers talking-circuit with a selected one of the line-contacts, aspring to restore the movable contact to position, a detent to hold the movable contact against the reactive force of the spring, a locking device operating when brought into action to prevent the movable contact from being moved off the line to which it has been switched, and means controlled by the telephone-hook to throw the locking device into or out of operation by, the act of taklng down or of hanging up the receiver.

5. In combination, a local talking-circuit, a circuit-closer controlling the, connection thereof with a common talking-line: means for holding out of action said circuit-closer, an electromagne't in circuit with a battery, means operated by said magnet to throw the circuitcloser into action, and a circuit-closer inthe battery-circuit adapted toflrelea se theholdingw out means of the circuit-closer in the talkingcircuit by closing the battery-circuit through the magnet and through the common talkingline between two connected telephones.

6. In atelephone system, the combination vanis'm at the 1. A switching mechanism for telephonesline contacts, a spring to return said movable conthe movable contact from v with a telephone in and with a plurality of stations, of a com. mon talking-line, a common ringing-circuit in-. )cludinga battery and a signal at'each station, individual receiving-and transmitting circuits connectible with the common talking line through a circuit-closer and switching mechstation, a lock-out device 'controlling said circuit-closer at each station and normally holding the same out of action, an

ringing-circuit through the talking-line and adapted to be energized when the talking-line is closed between one station and the other through the switch and the ringing-circuit is closed at either station, and means whereby the magnets in both connected stations are caused when energized from either station to throw off the locking devices in both stations and release the circuit-closers in the talking circuit.

7 In a lock-out mechanism for telephone systems the combination of a common talkingline, an individual receiving and transmitting instrument in a local circuit connectible a plurality of similar stations, a circuit-closing device 1n the-local c1rcu1t,.a locking detery and an electromagnet in circuit there- ,with through a circuit-closing key and with the common talking-line between the stations through the individual home contact of each station, means operated by the magnet when the circuit is closed between two connected stations to actuate the locking device and reholding the locking device in operative position when the battery is taken off the magnet. and means releasing the catch by the act of hanging up the receiver. I

8. In a' lock-outrnechanism for telephone systems, a circuit-closing device at each station controlling the connection between the local receiving and transmitting circuit'and a common talking-line, a switch adapted to give con-- nection at each station with any selected station of the system, a locking-lever adapted to hold the circuit normally open, an electromagnet having connection with a common signaling-circuit including'a battery by which all the stations comprising the system are interconnected, saidmagnet being adapted when energized to throw off the locking-lever, a push-button at each station for closing the battery from that station upon the magnet of a connected station through the switch of that station. a catch adapted to hold the locking-lever out of action, and a releasing device operative under the movements of. the local switch to throw off the catch when the contact-arm of the switch is moved ofl the stationary contact' 9. In combination, a common talking-line, a

switching mechanism electromagnet connected with the common through a switchand a home contact with vice holding said circuit normally open, a batlease the circuit-closer controlled by it, a catch plurality of stations, a

and circuit-closer at each station connecting the individual receiving and transmitting circuits the reel with any selected one of the other stations through the talking-line, a lock-out device normally holding said circuit-closer out of action, a signaling-circuit common to i all the stations in which is included a battery and a circuit-closing device at each station, and electrically-operative means controlling the line-circuit closers andadapted to release the same at the stations connected through the common talking-line when the signaling-circuit is closed at either of the connected stations, and to isolate the circuit-closers of all the remaining stations from the common talking-line when two connected Stations are using the line.

In testimony that we claim the foregoing we have hereunto set our hands and seals.

ALBERT KOCH ANDRIAXO. [Ins] HER-MANN llERBS'lRlT'l. [1. s]-

itnesses as to signaturcof Albert Koch Andriano:

EDWARD E.

M. REGNER.

XVitnesses as to signature of Hermann Herb- Stritt:

Osnonx,

JOHN A. Snonns, Mrs. L. 'DUFF.

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