DE225836C - - Google Patents

Description

IMPERIAL J

PATENT OFFICE.

PATENT LETTERING

- .M 225836 CLASS 21 /. GROUP

HUGO LISKE in BERLIN.

The arc lamps, but especially the AC lamps, often have the disadvantage that they do not ignite immediately when the lamp is switched on, but that the arc tears off in a continuous sequence until the coals have warmed up enough to have.

Tests have shown that this breaking of the arc when switching on

ίο the arc lamp by very strong braking devices, such as. B. Pumps o. The like. Eliminate can. However, these arrangements have the disadvantage that they are not only they are also switched on while the lamp is burning, reducing the ability to regulate the lamp is influenced to a sensitive extent during burning. But there are also ignition devices which the braking effect is almost entirely at

so regulating the lamp is canceled, and although this is the case with the so-called valve air pumps with a lateral in the jacket arranged valve.

According to the present invention, an effect similar to that of the latter is obtained Valve air pumps achieved in that the braking device for the control organs only acts at the beginning of the ignition stroke and after a certain period of the ignition stroke is switched off mechanically, whereby the lamp in the further course of the ignition stroke as well as during operation without this powerful braking device, which is only necessary for the ignition stroke burns. This is achieved by a braking device, which by a snap-off device is switched on and off.

For a better understanding of the invention, an embodiment is shown in the accompanying drawing such a braking device, which acts in the manner described when igniting the lamp, is shown.

Fig. Ι is a vertical section through a lamp with coals standing on top of one another with a partial side view, while FIG illustrates a top view. 3, 4 and 5 illustrate the action of the Braking device on the regulating member on an enlarged scale. Fig. 6 shows the braking device at the moment of switching on, FIG. 7, on the other hand, when switching off.

As can be seen from Fig. 1, there is shown a braking device for a lamp with superposed coals. 1 is the lower lamp plate, 2 the upper lamp plate, which are connected to each other by struts 3 in Connected. In the lower lamp plate ι is the carbon holder 4 for the lower Coal 5 attached, while the upper coal 6 slides in a guide tube 7 and through a clamping device consisting of two plates 8 and 9 when the lamp is switched on is both raised and released periodically during the burn-off of the electrodes as soon as the two clamping plates 8 and 9 are in an approximately horizontal Rieh- ' are located. The two clamping plates sit at the lower end of a pull rod 10, which is attached to a two-armed lever 11 at the top. This two-armed lever 11 has its pivot point at 13 and carries at its end by means of a leaf spring; 14 articulated the core I5, while the other end 12

45

5 °

55

Claims (2)

with the usual pump 16 'is in connection. The core 15 is seated on a pivot pin 17 which is influenced by the braking device. The braking device consists of a bracket 18 which is fastened to the upper lamp plate by means of two screws 19 and 20. A U-shaped part 21 is rotatably arranged on this bracket 18 and is held in the horizontal position by a spring 22 and, if it is not influenced by the pivot pin 17, always rests on the bracket 18 at 23. On the U-shaped part 21, a stop thumb 24 is also rotatably fastened in such a way, to be precise on an axis 27, that it is always pressed onto the U-shaped part by a spring 25. The operation of the device is as follows: If the lamp is switched off, the pivot pin 17 is located above the thumb 24 (see FIG. 3). If the lamp is switched on, the core 15 rotates immediately; influenced by the coil, the lever 11 counterclockwise, whereby the pin 17 immediately hits the nose 26 of the lever thumb 24, and since this lever thumb 24 rests on the U-shaped part, so cannot rotate, so the U-shaped part 21 rotated (see. Fig. 6). The spring 22, which can be held firmly, but counteracts this rotation, so that the regulating organs are now braked in their further movement. This braking lasts until the pin 17 has slipped off the nose. After the sliding, the braking device does not act on the regulating organs because the pin 17 is permanently below the nose 26 during the regulation. . If the lamp is switched off, the action of the core on the lever 11 ceases; and this is now rotated clockwise by the coal held by the clamping device. During this rotation, the pin 17 now abuts the lower side of the nose 26 of the lever thumb 24 and, since the U-shaped part 21 is stationary, rotates the lever thumb about its axis 27, which is easily possible because the spring 25 It goes without saying that the present arrangement can be used not only for arc lamps with opposing coals, but also for lamps with coals that are inclined to one another. 1. Device for igniting arc lamps, especially AC arc lamps, characterized in that a lever influencing the control device has its end point at a brake lever resilient in two directions, whereby the spring force that is overcome when the lamp is ignited must, is so large that a strong braking of the ignition movement occurs until after the ignition of the control device influenced lever has passed the brake lever while with the opposite movement of the control device this only the one in the weaker acting in the second direction . Needs to overcome spring force. 2. Apparatus according to claim 1, characterized in that the brake lever _ consists of a U-shaped part and a lever thumb resiliently rotatably arranged in this U-shaped part, the U-shaped part itself being resiliently rotatable again, but with stronger suspension is arranged on a bracket attached to the lamp plate. "_; [■:. 1 sheet of drawings.