DE191398C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVl 191398 - CLASS 21 c. GROUP

Patented in the German Empire on January 5, 1907.

For the periodic opening and closing of a circuit, a Hot wire can be used, which is heated by the consumption stream, whereby the relatively slow heating and cooling of the hot wire the desired Switching pauses result. The hot wire breaks after a certain expansion the electricity heats the circuit to it first

ίο after cooling down to a certain extent, that is to be restored after shortening accordingly. Such switches can, for example Serve as a signal transmitter or in electrical systems with a flat rate find, in order to cause a periodic disturbance in the electricity supply after the set current limit has been exceeded, but this is easily canceled by reducing the consumption flow.

In order to produce the desired switching breaks, the hot wire must of course not be used directly after switching off the consumption current at the beginning of shortening, restore the circuit immediately, as with Application of simple contacts would be the case, he may rather the circuit first close again after it has shortened by a larger piece at a length, which in itself corresponds to a much lower than the permissible maximum current strength. That's why, and also to avoid standing fire at the contacts, you can press the instantaneous switch through the hot wire let whose moving parts first have to cover a greater distance on whose At the end of the contact pieces suddenly flip over into the new position. In this way you can you meet all conditions, only required because of the extensive travel and the relatively large adjustment work long and strong hot wires that are not can be accommodated in a small space. Avoiding this evil is the most essential Purpose of the new switch shape described below. In this case, a relay is used in a manner known per se, which is closed by the expanding hot wire and serves to interrupt the main current.

Fig. I shows schematically a switch of the new form, for example in a system for a flat rate, where the power requirement for the consumer ν should remain below a certain limit. The current is fed through the hot wire h via the contact c to the consumables ν .

The hot wire h, which is useful because of its lateral deflection to produce relatively large deflections, is connected by insulating pieces ii to the two simple switches J ₁ and S ₂ , the contact pieces of which are labeled _{C 1} and C _{2, respectively.} These two contact pieces are conductively connected, but one C _{1 is touched earlier than C 2} when the hot wire is bent. The shift lever S ₂ is in series connection with the Hitzdrahte with a power line in \ ^/ Getting Connected. From C ₁ C ₃ leads

Claims (3)

a line to the contact piece c3, which is touched by the switching lever s after opening the main contact c, as indicated by dotted lines in the figure. A voltage-wound electromagnet e is connected on the one hand to one power line and on the other hand to the switching lever S1; together with the switching lever j and the contact c, it forms a relay for opening the consumer circuit. The contact piece C2 is set so that it is touched by its switching lever S2 after the prescribed current limit has been exceeded for some time. In the normal state, which is assumed in the figure, the slightly protruding contact piece C1 can already be touched by its switching lever S1 or still be free, because as a result of the connections shown, the switch only comes into effect as soon as the protruding contact piece C2 touches its switching lever S2 will. At this moment the relay e receives current via S2 C2 C1S1, it pulls the armature of the shift lever j and interrupts the consumption circuit at c. As a result, the hot wire h begins to shorten, the contact between c, and S2 is released, but the relay e remains energized, since it is current via the hot wire, the switching lever s, which has come into the dotted position, and via C3 C1 S1 receives. The conditions are chosen so that the low excitation current of the relay does not significantly affect the hot wire. But as soon as the hot wire has shortened so much that the connection between S1 and C1 is released, the relay is also de-energized, the main line is closed again at c, the consumables receive power, and if the cause of the inadmissibly high power consumption is not eliminated , the game described begins anew, in such a way that, as required, there is always a more or less large pause between the opening and closing of the main stream. Obviously, the intended purpose can be achieved in the manner described with a hot wire of very small dimensions, since the hot wire only has to use contacts for the low excitation current of the relay, and with the correct choice of the conditions, the switching pauses can be set at will within the required limits will. The apparatus shown schematically in FIG. 2 works in a very similar way, which differs from the former only in that the open position of the main switch is not achieved by maintaining the excitation current in the relay on a secondary route during a longer break, but by mechanical locking of the shift lever. In this case, the hot wire h only works with one contact piece C2, which it touches after a certain expansion. This energizes the relay, which again interrupts the consumer circuit at c. The open position of the shift lever s assumed in this figure is now maintained by the mechanical lock consisting of the angle lever w, which is pulled against the stop α by a spring f. As soon as the shortening of the hot wire begins, the relay is de-energized, the hot wire begins to lift the angle lever w through the loosely attached bolt b, and after a certain time this releases the locking of the switching lever s, so that the power supply for the consumables ν occurs again. The repetition of the A ^ organges takes place exactly as described for the switch according to FIG. Instead of making the hot wire immediately 'current-carrying', it can of course also be heated by a special heating element through which the consumption current flows, as the details of the switches described can be changed in many ways. It is only essential that the hot wire closes the contact for a relay when a certain current intensity is exceeded or if a predetermined current intensity is sufficiently long, which interrupts the consumption circuit and keeps it open until the hot wire has shortened by a larger piece, so that there are pauses of any length between the switching processes. Godfather nt-A ν Proverbs: 1. Hot wire switch for alternating Opening and closing of a circuit when exceeded or with a sufficiently long duration of a predetermined Amperage at which one is under the influence of the heat of electricity expanding hot wire, the circuit of a relay interrupting the main current is closed by a device that keeps the main power switch open until the hot wire is removed has shortened to a length which is substantially less than that of the predetermined current intensity corresponding to the Purposes to achieve the switching operations with sufficiently long pauses with a hot wire of small dimensions. 2. Hot wire switch according to claim 1, characterized in that opposite the hot wire two conductive to each other connected contacts (V ₁ and cJ are attached at different distances, of which the more distant one (c ₂ ) closes the relay circuit via the other contact (C ₁ ) with sufficient expansion of the hot wire, whereby the main switch (s) is opened and at the same time - third contact (c _s ) is closed, which keeps the relay circuit closed via the contact (C ₁ ) closer to the hot wire until the hot wire has been shortened to the shorter length. 3. Hot wire switch according to claim 1, characterized by a mechanical Blocking on the relay, which keeps the main power switch open until it is through the The hot wire shortened to the shorter length is loosened. 1 sheet of drawings.