DE212513C - - Google Patents

Description

EVIDENCE

PATENT OFFICE.

PATENT LETTERING

CLASS 21 a. GROUP

Addendum to patent 211302 from January 20, 1907.

Patented in the German Empire on February 23, 1907. Longest duration: January 19, 1922.

The invention relates to an embodiment of that described in German Patent No. 211302 Converter in such a way that it can be used in a telephone exchange except as a call alternator can initially still be used as a transmitter for the speech streams and also as an alarm clock to receive a call. For the former purpose, the magnetic relationships are the inductively coupled Windings of the converter according to the known type so dimensioned that they are properly connected with the speech circuit correspond to the voltage and current strength prevailing in this, while furthermore to the For purposes of use as an alarm clock, the armature of the converter is designed as a carrier of a clapper becomes, which in the back and forth caused by the incoming current Swinging the anchor strikes a bell.

There are already known telephone stations in which the usual magneto-electric Call machines are replaced by devices that use a direct current source either by an automatic interruption device into a pulsating one Direct current or by means of a manually driven pole changing device into one Alternating current is converted.

It is also known to use the windings of these devices simultaneously for the transformation the speech alternating currents or also as alarm clock coils.

Compared to these devices, however, the present embodiment is characterized in that instead of the devices, which automatically generate a pulsating direct current or a symmetrical alternating current with the help of the manually operated commutator generate, the converter of the main patent 211302 is used, which in particularly advantageous and with a relatively high degree of efficiency in one small shape suitable for telephone stations can be brought. Because this device by closing a circuit consisting of a direct current source and the primary winding of the converter, can be driven and here an alternating current with equally high positive and negative voltage values delivers, such a telephone station combines the advantages of both facilities mentioned as known, namely on the one hand the simplicity in the service, the cheapness and the small footprint; on the other hand the through the increased electrical effect of the alternating current curve symmetrical to the zero line, which is expressed in the large call range. 6q

The combination with the alarm clapper has the additional advantage, i.e.,

with the same electrical power (same call range) the size and weight of the Apparatus system of the intercom is still further reduced and the manufacturing costs continue can be reduced because in place of the bulky and inconvenient hand-operated Commutator only a push button or equivalent circuit breaker occurs.

ίο In the drawing, an expedient embodiment of the subject matter of the invention is shown schematically. In the figure, / denotes the remote receiver, h the hook switch, m the microphone, u the combined pole changer and transformer, b the battery used to power the microphone and operate the pole changer, consisting of one or two elements or accumulators, and d a push button or the like for switching on the operating current for the pole changer.

The mode of operation of the circuit is as follows:

If the subscriber wants to call the office or another subscriber, he temporarily depresses the push button d . As a result, the battery δ is switched to points 2 and 3 and the pole changer, as described in detail in the main patent, is set in action, so that an alternating current is generated in the winding s, which via the capacitor k and the subscriber line to Office or the called subscriber station and there brings the call signal relay or the alarm clock to respond. When the push button d is pressed down, the contacts 8, 9 are closed at the same time and a short circuit is thereby placed on the remote receiver / a short circuit for the duration of the wake-up, so that even in the event that the remote receiver has been removed before the wake-up and consequently the via contacts 4 , 5 of the hook switch existing short circuit has already been canceled, the wake-up current does not pass through the remote receiver. The wake-up current is interrupted when the push button d returns to its rest position, thereby putting the pole changer out of operation. If the participant then takes the handset f from the switch h , the contact 7, 6 is closed and the excitation winding p is thereby placed in the circuit containing the microphone m and the battery b , so that the winding p is the primary winding of the while speaking An induction coil, the secondary winding of which is formed by the winding s lying on the same iron core (not shown) with the winding p.

If the subscriber station is the called station, the winding S serves as an alarm coil when the call is made. If the alternating current sent by the calling point passes through the winding s, the polarized armature α is caused to oscillate as a result of the changing magnetization of the iron core and the associated alarm clapper is alternately struck on the bell g.

As you can see from what has been said, the alarm clock of the calling station rings when you call. This ringing can, if necessary, be alleviated or eliminated by pressing a damper device against the bell shells when the push button d is depressed, or by moving the bell shells themselves a sufficiently large distance apart. Of course, a special alarm clock of a known type can also be used. In this case, of course, the bell shells g on the pole changer would be omitted and the device, in addition to its actual purpose, would only serve as an induction coil.

The capacitor denoted by k in the figure, which is connected in series with the winding s, can also be omitted. In the case of lines of greater length, however, it is advantageously used to compensate for the self-induction that is excited in the winding s when it is woken up. It can then also be used in a known manner for the purpose of giving the final signal.

Another equivalent switching device can take the place of the push button d. Likewise, another of the embodiments of the combined pole changer and transformer mentioned in the main patent can also be used in the circuit without affecting the essence of the invention.

Claims (1)

Patent claim: Device for converting electrical currents according to patent 211302, characterized in that that the armature of the pole changer carries the clapper of a bell, for the purpose of the device apart from being used as a call alternator and converter for the speech currents, also as an alarm clock for a telephone station can. 1 sheet of drawings.