DE1149753B - Circuit arrangement for hotel telephones - Google Patents

Description

The subject of the main patent is a circuit arrangement for hotel telephone systems, in which a Via a connection line of a call station on the part of a clockwork at an adjustable time actuatable contact given incentive by switching means of the exchange automatically for transmission is evaluated by the ringing current to the intercom. This creates a possibility in smaller Overnight accommodation in which the telephone exchange is not constantly manned, that To wake up the individual guests automatically at a specific time. It exists But now in such overnight establishments there is also the wish that certain people who are intended to serve hotel guests, identify them when they are in the vicinity of a call station, in order to give the mediation the opportunity to determine where the individual is People belonging to the group of people concerned are located within the company so that they may can be called over the telephone system.

The invention therefore extends the circuit arrangement forming the subject of the main patent for Hotel telephone systems in which one has a connection line of a telephone station on the part of a by a clockwork at an adjustable time actuatable contact given incentive by switching means the exchange automatically evaluated for the transmission of ringing current to the relevant intercom is in such a way that to the same wire of the connection line earth either via the through a Clockwork actuatable contact or via a contact that is in series with a half-wave rectifier and to the Actuation can be switched on by certain persons provided contact and that in the latter Case of the switch-on circuit for the call lamp connected to this wire of the relevant Call station prepared and when a direct current source of certain polarity is switched on by actuation a switch in the switchboard assigned to the group of people concerned is closed. It is useful here to have one with the contact of the call station, which can be operated by a clockwork Half-wave rectifier, but with opposite polarity, to be connected in series. The invention also suggests before that via the switch assigned to a certain group of people in the exchange a Interrupter device can be started, which turns on the call lamp intermittently to a direct voltage certain, 5a the polarity of the half-wave rectifier located in the circuit is switched on.

Circuit arrangement
for hotel telephone systems

Addition to patent 1 042 036

Applicant:

Telefonbau and Normalzeit GmbH,
Frankfurt / M., Mainzer Landstr. 134-146

Heinz Altmann, Frankfurt / M.,
has been named as the inventor

This has the effect that the call lamp in question flickers in a very specific rhythm when it identifies the presence of the person to be searched for in the exchange while it is in the Identifying a call station call lights up quietly or, if necessary, in another The rhythm begins to flicker.

The embodiment of the invention shown in the drawing is an extract from a Hotel telephone system, with all the details unnecessary for an understanding of the invention are omitted.

Of the station Tn connected to the subscriber line L , only a hook switch contact UI, the wake-up contact WK, a jack Kl to be bridged by a short-circuit plug, the calling unit of the station in question W and two rectifiers GrI and Gr 2 are shown, which are polarized differently and of which the rectifier GrI with the jack £ 7 and the rectifier Gr 2 with the wake-up contact WK are in series. Ground potential can be connected to the wire α of the subscriber line L via the wake-up contact WK and the jack Kl, which are connected in parallel to one another.

This subscriber line L ends in the exchange in a jack NKL, via which the exchange can connect to the relevant telephone station by inserting an interrogation plug. The respective call station is in the

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Mediation is also assigned a call lamp NL , through the lighting of which the station in question can call the operator. In addition, each subscriber Tn for whom the wake-up call option is provided receives a differentially switched wake-up call relay WR in the exchange. If the operator wants to search for certain people who are in the vicinity of a call station and who have identified their presence by inserting a pin into the jack Kl , they press the search key ST, through 'the one of the relays SV and SW interrupter circuit. is left on. The system is supplied with ringing current from the mains supply unit NSP, which contains a mains transformer NTR and a rectifier Gr .

If the subscriber Tn wishes to conduct a conversation with the exchange or if the exchange should set up a conversation for him, the intercom Tn has to pick up its receiver, which closes the loop.

Earth, u6, Gm, WRl, wr5, jack contact b, b-Aäsi, subscriber device, fork contact U I, α-wire, jack contact a, WRU, wrl, sll, NL, U2, AKl, AKH, -.

Since the relay is energized in opposite directions WR via its two windings I and II, only the subscriber lamp NL comes in this circuit to light up, while the relay AK II turns on the call control in a known manner.

If two subscribers should hang up their receiver at the same time, the capacitor C1 connected to ground via the contact η 4 prevents these subscribers from talking via the multiple connected to the subscriber lamp NL. The exchange queries the calling subscriber line in a known manner, the circuit for the relay WR being disconnected when the jack plug is inserted into the jack contacts.

If a subscriber Tn has set the slave clock in the subscriber set, the wake-up contact WK is switched on for a period of about one minute with the minute jump at the set time. The α-wire is earthed via the wake-up contact WK , so that the relay WR comes to respond via its winding II.

Earth in the subscriber set Tn, WK, Gr 2, α-wire, jack contact a, WRIl, wrl, sll, NL, ü 2, AKl, AKIl, -.

The relay WR is linked in the following circuit:

Earth, wake-up contact WK, Gr 2, α-wire, latch contact α, WRH, wrl, -.

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The partial winding I of the network transformer NTR is connected to the δ wire via the contact wrS, so that alternating current reaches the call organ of the subscriber station concerned.

Earth winding I of the transformer NTR, wrS, jack contact b, 6-wire, alarm clock W of the subscriber station Tn. Gr 2, wake-up contact WK, earth.

The wake-up call can be switched off manually; if this is not the case, the next minute jump that opens the contact WK causes the wake-up call to be switched off.

To indicate their presence to operate pokes her short plugs into the Klinket / the user set Tn. Thus, the lamp circuit for participants lamp NL is prepared, and if the transfer presses the search button ST, the extension lamp NL starts to flicker. By closing the key contact ST , the relays U, Sl, SU etc. are switched on. A relay S is provided for every call station that can be used to identify the presence of the operator. By closing the contact u 4, the flicker relay SV is switched on, which energizes the relay SW with its Kontaktiv4. This in turn interrupts the switch-on circuit for the relay SV with its contact sw 4, so that the relay SW also drops out again by opening the contact sv4, whereupon the cycle described is repeated.

By pulse-wise closing of the contact sv 6 , the individual search pulses that cause the lamp NL to flicker to light up are given to the subscriber line.

Earth, rectifier Gr in the power supply unit NSP, sv6, u2, NL, sll, wr2, jack contact a, α-wire, Gr 1, Kl, -.

The AC voltage taken from the partial winding III of the network transformer NTR is rectified by the rectifier Gr in order to apply a positive voltage to the a-wire, for which the rectifier GrI in the subscriber station is permeable. The electrolytic capacitor C1 connected to this flicker line via the contact μ 6, in cooperation with the other resistors, smooths the pulsed direct voltage.

From the flickering lighting up of the lamp NL , the exchange recognizes where the entire person is and can contact them by telephone. No call can be made from an extension during the search process. Likewise, no searching process can be initiated when the call from an extension is present, since the switch-on current for the relay U is then separated by the contact akll2 . Of course, it is possible to remove the latter priority by inserting bridges.

Claims (3)

PATENT CLAIMS: 1.Circuit arrangement for hotel telephone systems, in which an incentive given via a connection line of a telephone station by a contact that can be actuated by a clockwork at an adjustable time is automatically evaluated by switching means of the exchange to send ringing current to the relevant telephone station, according to Patent 1042 036, characterized in that earth is connected to the same wire of the connection line (α wire) either via the contact (WK) that can be operated by a clockwork or via a contact (KO ) in series with a half-wave rectifier (GrI) and intended for operation by certain people can and that in the latter case the switch-on circuit for the call lamp (NL) connected to this wire relevant call station (Tn) prepared and when a direct current source of a certain polarity is switched on by actuating a switch (ST) assigned to the relevant group of people in the exchange. 2. Circuit arrangement according spoke 1, characterized in that a half-wave rectifier (Gr 2) of opposite polarity is in series with the contact (WK) which can be actuated by a clockwork. 3. Circuit arrangement according spoke 1 and 2, characterized in that an interrupter circuit (SV, SW) can be set in motion via the switch (ST) assigned to a certain group of people in the exchange, which intermittently connects the switch-on circuit of the call lamp (NL) to a DC voltage of certain polarity matched to the forward direction of the half-wave rectifier (GrI) in the circuit. 1 sheet of drawings