DE275425C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVl 275425 - CLASS 21 a. GROUP

OTTO STRITTER in LICHTENRADE.

Patented in the German Empire on December 14, 1911.

The invention relates to a line switch for extensions, with the help of which on the common line in a manner known per se necessary for the final signaling Circuit change is effected. So far it has been necessary to do all of the same Call stations lying on the line allow this circuit change To lead lines or to provide special switching devices, such as relays. at the new line switch this is not necessary, rather the switching device is the a call station, usually called the main station, by adding a few switch springs made suitable for all other call stations to change the circuitry on the joint line for the final signaling. This arrangement has the The advantage that only one of the call stations on the same line is the one known as the inquiry Intermediate position of the connection keys (exchange line keys) is necessary and for all others the devices belonging to the consultation circuit become superfluous. As a result will be in addition to simplifying the switches, also those required for the consultation circuit Cables saved, which significantly reduces the costs of the system.

On the drawing, an embodiment of the invention is shown in perspective in Fig. 1, which essentially corresponds to the drawing of the main patent. Fig. 2 illustrates schematically the interconnection of two devices and is intended for Explanation of the operation of the device are used. For the sake of simplicity, this should only be on the new parts caused by the invention are received, while those in the Parts described in the main patent are assumed to be known.

With the aid of a guide pin is k on the armature as shown in FIG. 1 can be seen, 13 hinged to an insulator 12 which k upon displacement of the armature on switch springs 14-22 a set C is applied. The switchings made in this way are discussed in more detail below in the explanation of the mode of operation. The switch spring set of the key α, which can be changed over by the projection h, is increased by three springs y _x , y ₂ , y ₃ , of which y _z and y _{3 are} the contact indicated in the main patent with y for switching on the magnetic windings r , while the spring y _{x is used} to switch off the magnet winding r of your own apparatus. The contact between y ₂ and y ₃ is only temporary and takes place when the key α is depressed as far as a stop 24; but it stops as soon as the key goes back so far when released that the pin c locks the tooth d. Instead of the four springs that can be folded over by the cam g, only the two springs 3 and 4 are retained.

The mode of operation of the new facility is essentially the same as in the main

Claims (2)

patent described; however, in order to properly appreciate the value of the invention, nevertheless discussed in detail with reference to FIG. If the key α is fully depressed on the main station D , the contact springs y _a and y _{2 are connected to} the negative pole of the battery via the common line 25 and the contact springs y ₂ , J _{1 of} the speech stations E to the parallel-connected ones Magnet windings r of the remaining microphone units E to the positive pole of the battery. After releasing the key α it goes back a little and is held in the working position by the tooth d , whereby the pieces g and h keep the associated switching spring sets switched while the springs y ₂ ^and Jz are again out of contact. An excitation of the own electromagnet r cannot occur because the pressed key α separates the spring y _x from y _% and thus interrupts the connection to the own winding r; on the other hand, the armature k is thrown over by the specified current short at all other call stations, whereby the insulating piece 12 that is carried along puts the switching spring set 14-22 into the working state. As a result, the springs 16 and 19 connected to the exchange lines 27, 28 are lifted from the lines leading to the connecting springs 5 and 10, so that even when the springs 6 and 9 are switched , the speech set connected to T at another location, for example an extension E, does not can be brought into connection with the lines 27, 28. At the same time, the pressed-in insulating piece 12 at the station E separates the contact springs 21 and 20 and connects 21 to 22, which prepares a current path, but is only closed as soon as the subscriber of the station D hangs up his receiver after the call has ended and thus the contact at χ closes. The current then flows from the negative voltage of the battery via the contact closure at x, contacts of springs 20 and 21 of main point D, common line 26, contact springs 21 and 22 and the magnet winding / extension E to the positive pole of the battery. As a result, the winding I receives current until the contact springs 21 and 22 at the speech station E are separated, which only takes place when the armature k recedes as a result of the current flow through the winding I. By the return of the armature to its rest position, the contact springs 17, 18 are in turn connected to 16 and 19, so that the lines 27 and 28 are released for further traffic. The query takes place, as described in the main patent, at the intercom D, when it is connected to the lines 27 and 28, by pressing the corresponding private key, also not shown here, whereby the office key α is partially triggered in a known manner and in a Intermediate position is held so that the contact springs 6 and 9 ,. to which the speech set Γ is connected, separated from the connecting springs 5 and 10, which lead via the contact springs 18, 19 and 17, 16 to the lines 27 and 28, and connected to the switching springs 7 and 8 connected to the private network P. The switching spring 3 is, since the piece g is still in its area, not lifted off the switching spring 4 in this intermediate position, so that the switching change caused by it, assumed to be known, is retained on the lines 27, 28 and a premature signaling of the signal the office is prevented. The parallel-connected contact springs 3, 4 and 14, 15 are only required for the main station D because, when this is connected to the exchange line 27, 28, the springs 14, 15 do not touch because the electromagnet r is not energized, while 14, 15 can be closed by r as soon as E has switched on at 27, 28. Other hand, wants the other station E at a part, existing connection with the external lines 27, 28 make an inquiry to a private place, so an intermediate position is the official key is not α further required because specified when switching on the station E, the cut-off device of the station D in the Way by the electromagnet winding / is put into action, the switching springs 14 and 15 being closed by the insulating piece 12 of the locking armature k and in turn making the circuit change required for the final signaling via the lines 27 and 28. What has been said for the intercom E applies to all other stations that can use the trunk lines 27 and 28 together. Sponsorship τ claims: i. Extension line switch with automatically lockable contact elements and with electromagnetic signaling and locking devices, characterized in that at one of the speech stations (D), for. B. at the main station, the electromagnet (r), which controls the signaling and blocking device, with the signaling and blocking at the same time causes the closure of a contact (14,15), which is parallel to the in a known manner as a result of an intermediate position of the office switch Queries that prevent the final signal from being given (3, 4) is for the purpose of giving the final signal at the other microphone units in the event of queries without being able to prevent intermediate positions of the office switches located there. 2. Embodiment of the changeover switch according to claim i, characterized in that the armature of the locking electromagnet (r) carries a part (12, 13) which prevents eavesdropping and can be easily removed to enable eavesdropping if necessary. 1 sheet of drawings. Berlin, printed in the Reichsdruckerei.