FI62440B - BISTABILT KLYKOMKOPPLINGSRELAE FOER TELEFON- SPECIELLT NOEDANROPSAPPARATER - Google Patents

Description

I- 1— r-, M4. ANNOUNCEMENT ISSUE

^ (11) UTLÄGGNINGSSKRIFT 624 4 0

Patent meideiat ^ ^ ^ (51) Kv.ik.3 / Int.ci.3 H 04 M 1/08 FINLAND —FINLAND (21) PK «nttlh« k * mu * - Pittnttnaekning 771ΐβθ (22) Hakamltpllvl - Am6kntng * d * g »13.0t. 77 (23) Alkupllvt — Glklghatsdtg 13.01+. 77 (41) Tullut lulklMkil - Bllvlt effuncllg 18.10.77 'and registry administrators NihtivUclpron,. month | foreign date, _ 31.08.82

Patent * och registerstyrelsen Anidkan utlkgd oeh utl.ikrift «n publlc« r «d (32) (33) (31) Pyy4« tty utuolkeu * - Begird priority 17.0U. 76

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2617093-U

(71) Neumann Elektronik GmbH, ‘Biilowstr. IOU-IIO, D-1 + 330 Miilheim-Ruhr,

Federal Republic of Germany-Förbundsrepubliken TysklÄnd (DE) (72) Walter Herrmann, Miilheim-Ruhr, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7 ^) Oy Kolster Ab (5I +) -, speciellt tõdanropsapparater

Conventional speech devices include a fork switch that is actuated by lifting and lowering the handset and that, when the handset is down, separates the speech circuit from the telephone line. For safety reasons, the test voltage must be switched off with a safety of 2000 volts in the a-line state of this fork switch. In the case of mechanical switches, which are made to work by lifting and lowering the headset, this does not cause any problems. In emergency telephones and other similar equipment connected to the telephone network, where the telephone connection is not established by lifting the handset but by pressing a key, it is necessary to use a relay instead of a mechanically operated contact, which must be a bistable relay to save energy. Furthermore, this relay should be usable for printed circuits and vibration resistant and should require only low traction and emission power. In this connection, considerable difficulties arise in combining these requirements with the requirement that the relay withstand a test voltage of 2000 volts in the open mode.

According to the invention, this difficulty is overcome by providing a bistable fork relay for telephone, in particular emergency call devices, which relay comprises at least two simultaneously connected, simultaneously opening and closing contacts arranged in the second conductor of the telephone line connected to the telephone. Relays comprising several contacts which are closed and opened simultaneously are known per se. But in these known relays, different contacts serve different purposes and are located in different circuits, respectively. It is therefore an invention to connect the relay contacts in series in such a known relay and to use such a relay as a fork-switch relay. Since the relay can also contain more than two, preferably three to five contacts connected in series, it is of course possible to achieve test voltages of 2000 to 3000 volts.

Since the bistable relay starts quickly even with short current pulses, the contacts connected in series in the object of the invention can at the same time act as a nsi contact in the selection event.

The figures show exemplary embodiments of the use of an object of the invention in an emergency call apparatus and at the same time show other advantages of the object of the invention.

Figure 1 shows the connection of the emergency call equipment with the GU relay separate from the nsi relay.

Figure 2 shows the connection of an emergency call apparatus in which the GU relay and the nsi relay are combined into one relay.

In the connection according to Figure 1, a call is initiated using the key H, by means of which a short positive current pulse is given to the relay winding GU. The relay pulls and the four contacts gu connected in series close and, since the gu relay is a bistable or hold relay, remain closed even after the key H has returned to its sleep state. Since the control part St simultaneously receives a positive pulse, a selection event begins, which in telephone calls is usually performed by means of a dial, but which in emergency call equipment is preferably caused by a clock sensor included in the control part without the operator having to do anything. In this case, the NSA relay receives an impulse from the control section, so that the ns contact 3 62440 closes and keeps itself closed. The NSI relay receives a predetermined number of pulses of varying polarity that cause the nsi contact to open and close, imparting pulses to the telephone line in the conventional manner a. The NSA relay is also returned to its sleep state with the nsa contact open. The voice connection via the ab line is now established, with the microphone or speed dial unit connected to point T.

In the case of emergency call equipment, the call is not terminated, as in the case of telephone equipment, by lowering the handset to the fork, but is terminated by an impulse from the exchange or the called point. This negative closing pulse returns the GU relay to its open position, i.e., the four gu contacts open so that T is again disconnected from the telephone line and the disconnection point of the four gu contacts cuts off the 2000 volt test and interference voltages.

The embodiment according to Fig. 2 differs from the embodiment according to Fig. 1 only in that the GU relay and the NSI relay are combined into one relay. Also in this case, the call is started by briefly pressing the H key, the GU + NSI relay pulls, the contact met gu closes. In this case, the control section St also provides selection pulses to the GU + NSI relay. The pulses are given by opening and closing the four gu contacts connected in series. The operation of the NSA relay is similar to that of the circuit of Figure 1. Also in this case, the call is terminated so that the control part gives a negative pulse to the GU + NSI relay, so that the gu contacts open.