DE233108C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

~ Jig 233108 - CLASS 21 a. GROUP

RICHARD.BOSSE. & CO. in Berlin.

Patented in the German Empire on January 27, 1909.

The invention relates to a telephone device intended for central battery operation with a main unit and one or more extensions that are both with each other enter into traffic as well as a connection with the without the intermediary of the main office Can establish exchange, whereas your call from the exchange is made via the main office can. The power supply of each

ίο Posting takes place depending on the choice of system in different ways. It can supply the microphones for outside calls fed either through both branches of the trunk or through one branch and ground whereas for calls between the extensions the feed current via the another branch of the line and earth from the central battery or from a special one Feed battery is fed. Such a power supply in two different ways for the traffic of the branches with the office or with each other is already known. at the known circuit arrangements of this type is used for the so-called inquiry, if an extension after a connection has been established with the exchange, another of the Wants to call extensions, the circuit of the first extension entirely from the outside line separately and to avoid evoking the final sign at the office Place of the device of the extension a choke coil or the like. Switched on.

In the circuit arrangement according to the present invention, the secondary circuits are separated from the primary circuits, which means that a of the extensions only the secondary circuit of the latter is switched off from the exchange line and connected to the extension to be called is connected; the primary circuit, however, remains with the inquiry connected to the exchange line, so that the power supply to the inquiring extension is over the branch of the exchange line continues, in which the end signal relay is switched on is. In this way, the exchange line remains permanently blocked even during the consultation. without having to make any special switchovers in the primary circuit for this purpose to need.

For connection to the exchange line are on the extensions with Side switch provided post office switch is provided, which in the rest position the supply of the Extension through that branch of the line in which there are no signaling devices on the exchange are switched on, or caused by a special battery. Through low

Pressing the post office counter to connect the extension to the exchange is also lifted The side switch coupled to the post office counter provides the power supply via one branch of the Line (or from the special battery) and switches the power supply to the extension via the other branch of the line, in which the call or closing character of the Office is switched on. The appearance of the

ίο the final sign on the office is thus Long delayed when the side switch was not in the idle position by hanging up the receiver is returned.

In the drawing, a private branch exchange system with three series-connected devices is shown as an exemplary embodiment, in which, for example, the power supply of the microphone circuit for official calls via the one. Branch of the trunk to earth and for extension calls via the other branch of the line to earth. If one of the branches, z. B. the point I, connect with the office, then after lifting the handset from hook h, the office switch A _s and thus also the side switch S _{s is} depressed. The feed current for the microphone of extension I flows from the central battery ZB of office A via the final character 5, line a, an alarm clock W _a , via two contact springs i, 2, line 3, choke coil 4, line 5, via contact 6 . on the receiver hook h of the apparatus, line 7, primary winding 8, microphone 9, line 10, choke coil 11 and through line e to earth E. _{So as long as the side switch S s} pressed down at the same time as the office switch receives springs 1 and 2 in contact, As a result of the passage of the current, the final character S remains blocked at office A. This state is retained even if, for the call to one of the other extensions, only the exchange switch A _s and not the side switch S _s jumps back into the idle position in a known manner by pressing an extension switch N ₂ or N _8.

When the switch A _s is depressed, the secondary circuit is connected to both branches α and b of the exchange line. The secondary current runs from the line α via the contact springs 12, 13, the contact 14 of the hook h, the secondary coil 15, the receiver 16, the capacitor 17 and the contact

. springs 18,19 to the line b. If by pressing down one of the extension switches, for example N ₂ , the office switch A _{s is} brought back to rest, only the mentioned secondary and not also the primary circuit that feeds the microphone 9 via the .Leitungszweig α and earth, interrupted and the listener 16 of the station I connected to the extension II. The speech circuit is as follows: From apparatus II through a line I ₁ to contact springs 20, 21, Morse contact 22, line 23, contact springs 24, 13, contact spring 14 on hook h, secondary coil 15, earpiece 16, capacitor 17, contact springs 18, 25 , Line 26, contacts 27, 28 and a line I _{2 back} to apparatus II. Since, as a result of the previous connection between station I and the office, the side switch S _{s of the} same is still in the depressed position, the microphone 9 of apparatus I receives power from the central battery ZB via the exchange line α and earth E, as already mentioned so that during this consultation position, the closing bell at the office can not appear.

However, if there was no previous connection with the exchange during an extension call, the side switch S ₆ . is in the rest position, the microphone 9 of apparatus I receives power from the central battery ZB of office A via line b, a choke coil 29 and springs 30, 2, line 3, choke coil 4, line 5, when talking to another extension, Contact 6 on the handset hook h, line 7, primary winding 8, microphone 9, line 10, choke coil 11 via line e and earth E. Since no signal is included in line b, via which the power is now supplied, to the office, a signal cannot be sent there either.

. The current fed through line b to extensions II, III can also be used with the help of the office or side switch A _s or S, _s to influence further signals for the other call stations, for example busy signals C, as shown in the drawing.

The call between the extensions can be made by means of an inductor / via the Morse contact 22 takes place.

Claims (1)

Patent-An saying: Telephone circuit for central battery with extensions that can be connected to the exchange line, to which the supply current is supplied when connected to the exchange line via one branch of the exchange line and earth that dominates the final character, but when connected to one another via the other exchange line branch and earth or from a special battery characterized in that the power supply in the case of an existing exchange connection (e.g. between I and A) then unchanged via the branch (a) which dominates the final character and contains the microphone (9) External line (α, b) and earth (E) occurs when the remote receiver (16) of the extension (I) connected to the exchange (A ) is temporarily with the switch to the so-called inquiry position (e.g. by pressing 2V ₂₎ another extension (II) is connected, for the purpose of each switching in the supply circuits (E, ZB, S, a, W _a , a, i, 2, 3, 4,5, 6, 7, 8, 9, 10, 11, e, E) and the resulting cracking noises or other disturbances. 1 sheet of drawings. Berlin, printed in the Reichsdruckerei.