DE489662C - Brush composed of lamellas, especially for high currents - Google Patents

Description

Brush composed of lamellas, especially for high currents A well-known phenomenon in electrical conductors is that when there is a flow through them high currents displace the streamlines towards the outer part of the conductor and the inner part of the conductor has little involvement in the power line. One has. therefore already proposed tubes for the continuation of such high currents to use. However, these tubes cannot easily be used for switch bridges use the interrupting contact pieces of electrical high-flow switches with each other associate. For this, a resilient concern is required and therefore it is already known to assemble these brushes from stacked metal sheets. With a brush designed in this way, however, the undesired one occurs again in the brush in heat-affecting current displacement to the outside.

The idea of the present invention is to make each slat such to participate in the power line that the current is forced through the To flow in the middle of the brush and to relieve the external current paths. this will achieved in that: the stream filaments flow through the entire cross-section of the lamellas, in that the external flow threads are directed inwards and thereby a specific current load across the cross-section of the brush's current path and is distributed approximately evenly over the contact surface. In the pictures are Exemplary embodiments are shown according to the invention.

According to Fig.z, the separate contact pieces = _, 12 by the actual lamellar brush composed of two part brushes 13, 14 connected to each other, as shown in section along the line A-A in Fig. 2 and in view is shown from below in Fig. 3. The brushes 13, 14 consist of metallic lamellar plates 15, as shown with their broad sides from Fig. Q. and 5 can be seen. On their The lamellar plates can be provided with paper insulation on the broad sides, like this is common with dynamo and transformer sheets. The lamellar plate 15 of the brush 13 according to Fig. 3 and q: has two outer parts 16; 17 and that in the same plane lying .lamellar plate 18 of the brush 14 according to Fig. 3 and 5, two outer parts 1g, 2o, which are mutually bent at right angles from the central part. Both Lamellas 15; 18 are, as can be seen from Figs. 3 to 5, put together so that that the ends 16 and 1g are directly opposite and the other two Ends 17, 2o are turned away from each other. This creates an area between the ends 16 and 1g interrupted U-shape. On the lamellar plate 15 as shown in Fig. Q. becomes = a second Lamellar plate raised, namely in the position according to Fig. 5, so that its outer Parts 1g, 2o in the position shown in dashed lines according to Fig: q. reach. Zn this Way are the lamellas. each of the two brushes = 3, 14 layered one on top of the other and then bent over the outer parts 16, 17, ig, 2o, see above that thereby the in Fig. x in side view and in Fig. 2 in section, essentially semicircular brush is created.

In the corresponding Fig. 6 to zo another type of lamellar brush according to the ET .finding is shown. The lamellar brush 21 again connects the separate fixed contact pieces ri, i2. The individual slats have an almost S-shaped shape and are shown in Fig. G and io in, view of their broad sides. In these lamellas 22, 23, the outer parts 24, 25 and 26, 27 are bent from the central part 28 at an obtuse angle. Two such lamellas 22, 9, 3, which are in the same plane and are shown in Figs. G and 10, are put together in such a way that the central parts 28 cross one another asymmetrically, as can be seen from Fig. 8. Under these lamellae 2z, 23 a second pair of lamellae is brought into the opposite position, so that any desired width of the brush 21 can be achieved by any combination of such pairs.

In particular, it can be seen from Fig. 8 that! the two outer lamellas 24, 26 on the left-hand side, via its middle parts 28, force the current to both; inner lamellar parts 25, 27 lead on the right side and vice versa the other pair of lamellas. Those composed of such individual pairs of lamellas Lamellexigebiide according to Fig. 8 are layered on top of one another and then their outer ones Parts 24, 25 and 26, 27 bent so that the shape of the brush shown in Fig. 6 is achieved.

The lamellas are of course connected to one another by screws or rivets held together, a brush designed in this way will meet the desired requirements fair in terms of current displacement and permissible warming.

Claims (1)

PATENT CLAIMS: 1. Brush composed of lamellas, in particular for high currents, characterized in that by the shape and arrangement of the individual brush plates - the external flow threads - directed inwards and thus the specific current load across the cross-section of the current path the brushes and is almost evenly distributed over the contact surface. - 2. From slats. composite brush, especially for high currents - after- Claim i, - characterized in that the points of contact are on different Sides and opposite ends of the slats are located. 3. Composed of lamellas Brush, in particular for high currents according to claim i @ or 2, characterized in that that the slats have a Z-like shape. 4. Brush composed of lamellas, in particular for high currents according to claim 1 to: 3, - characterized, that the individual lamellae are alternately layered. 5. Composed of lamellas Brush, in particular for high currents according to claims i to 4, characterized in that that the middle parts of two lamellas cross each other asymmetrically and with others also formed lamellae assembled and several such structures layered one on top of the other are.