DE1258505B - Brush holder for an electric collector machine - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

HOIr

H02k

German class: 21 dl-65

G 41397 VIII b / 21 dl
August 28, 1964
January 11, 1968

The invention relates to a brush holder for an electric collector machine, in which the guide slot formed by two opposing plate parts provided, two carbon brushes arranged next to one another are assigned a spring-influenced swivel member, the one with its free end part acting on the outer end of the two carbon brushes pressure finger which is provided in recesses opposite one another in the two plate parts is pivotable.

In the known brush holders of this type, for. B. according to Swiss patent specification 277 794, run the edges of the recesses in the mentioned plate parts straight in the direction of passage the carbon brushes. On the other hand, the brush holder and thus also the carbon brushes are during the During operation of the collector machine (motor or generator) exposed to constant vibrations. if now depending on the wear of the contact end of a carbon brush this latter from the pressure finger is pushed, this carbon brush has a notch effect that is in contact with it exposed to standing edges of the recesses mentioned, over the entire height of this Edge. The consequence of this is that the carbon brushes over time on their two sliding sides from above to be notched or pitted down in the longitudinal direction of the coal, which is the case with one or the other Carbon brush lead to difficulties in contact with the collector and thus lead to Disturbances in commutation.

On the other hand, this known embodiment of the type specified at the outset has the advantage of a clear and precise guidance and thus compliance with the radial desired for 'the carbon brushes Situation with itself. The advantages of such a precise radial position consist in a small frictional resistance, in a particularly good evaluation of the carbon brushes, in an even wear of the Carbon brushes and in an even wear of the collector.

In a known brush holder of a different type, several brushes are arranged at a distance from one another in the direction of the longitudinal axis of the collector, these brushes being guided in holes in a guide plate. These holes have the cross section of the carbon brush in their guide part, they are only slightly beveled at their upper end for better access. Therefore, on the one hand, the described advantages of a brush holder of the type specified above are not achieved, much brush holder for an electrical one
Collector machine

Applicant:

Rolf Galfetti, Basel (Switzerland)

Representative:

Dipl.-Ing. H. Kosel, patent attorney,

3353 Bad Gandersheim, Braunschweiger Str. 22

Named as inventor:

Rolf Galfetti, Basel (Switzerland)

Claimed priority:

Switzerland of September 2, 1963 (10 816)

on the other hand, the disadvantages described persist.

In another known brush holder, the carbon brush is guided in a parallel guide.

This parallel guide has a bevel at its upper end, on which the associated pressure lever for the carbon brush comes into play when about a third of the carbon brush is used up. In this known design, there are lateral recesses in the guide wall of the parallel guide not necessary, but the decisive disadvantage of this known design is a greater frictional resistance and on the other hand, the fact that the carbon brush only to a small extent their length can be worn away. The known holder is therefore uneconomical and in its Function disadvantageous.

Finally, another type of brush holder has become known, in which a carbon guide piece is funnel-shaped in the upper part and therefore likewise no lateral recesses are required in the guide walls. Here too, however, there is decisive disadvantage that the carbon brush used up only a small part of its full length can be and that because of the funnel-shaped design of the guide piece an inadequate Guide for the carbon brush is achieved, which lead to the inclination and clamping of the carbon brush can.

The invention is based on the object, while utilizing the described advantages of a brush holder of the type specified at the outset, the risk of

709 718/153

to eliminate disadvantageous notches in the carbon brushes with their serious consequences. this will achieved according to the invention in that the lateral edges facing the guide slot of the recesses have a course deviating from the direction of passage of the carbon brushes. On the one hand, this has the advantage of precise guidance of the carbon brushes over a large part their side surfaces are retained because of the abutment against guide surfaces, moreover but avoid that on the sliding surfaces of the carbon brush a maximum, for the formation of Deep-buried wear along an extending in the direction of brush passage Straight line occurs. Rather, it is due to the deviating from the direction of passage of the carbon brushes Course of the edges of the recesses a possible burial phenomenon to a wider one Zone of the brush sliding surface distributed, but in a smaller depth dimension corresponding to this distribution, which can then no longer impair the smooth passage of the carbon brushes. It has been shown that the measure according to the invention ensures full utilization all the advantages of the brush holder described is made possible and thus in particular one use the brush holder is made possible for rail motors, where a good, protected against vibrations Bracket, a large, even pressure between the carbon brush and the collector and an extensive one Consumption of the carbon brushes required: is.

An advantageous embodiment of the invention consists in that the edges of the recesses run obliquely and are arranged in a V-shape for each recess.

An exemplary embodiment of the subject matter of the invention is illustrated in the drawing. It shows

F i g. 1 shows a cross section through the brush holder,

Fig. 2 is a corresponding top view of two a guide slot for the carbon brushes of this Brush holder forming plate parts and

3 and 4 corresponding views of these two plate parts seen from the inside.

The brush holder according to FIG. 1 intended for electrical collector machines has two opposing plate parts α and b, which are fastened to one another at their ends with a spacer c (see FIG. 2) by means of screw bolts d. The two turntables and b thus form a guide slot e in which the carbon brushes, each consisting of two halves, are arranged next to one another. The carbon brushes / have at their collector here only schematically illustrated g averted end of a trough-shaped recess, engages in a loose free end of a resiliently formed Drucknngers h arranged contact sleeve i. The pressure finger h itself is attached to a spring-influenced pivot member 7, for which support arms k are provided on the plate part and in which the pivot members 7 are pivotably mounted. The spring influencing of the swivel links takes place by means of tension springs o, which ensure that the contact sleeve i hold the carbon brushes / resiliently pressed against the collector g in order to ensure constant contact.

Opposite recesses m and η are provided in the two plate parts α and b , both of which lie in the pivoting range of the end part of the pressure finger h. The recess m in the plate part b has the shape of a V-shaped, in the width direction of this plate part continuous cutout, while the recess η has the shape of a V-shaped cutout, which is only carried out on the inside of the plate part α , so that this Cutout η in the width direction of the plate part is therefore not continuous. Thanks to these two recesses, it is possible for the end part of the pressure finger h to carry out its pivoting movement unhindered. In addition, these two recesses m and η provide enough space on opposite sides of the carbon brushes to grasp the remains of worn brushes from the outside without difficulty and to remove them in order to insert new carbon brushes.

What is important in these recesses m and η is the fact that the delimiting edges of the same do not run parallel to the direction of passage of the carbon brushes /, but rather at an angle to it. The advantageous consequence of this inclined course of the edge has been described in detail in the introduction.

Although these edges run obliquely here and for the achievement of the intended purpose of a unhindered passage of the carbon brushes is probably the best solution, these edges could possibly also take a curved or a zigzag shape.

Claims (2)

Patent claims: 1. Brush holder for an electric collector machine, in which the two carbon brushes arranged next to one another and provided in a guide slot formed by two opposing plate parts are assigned a spring-influenced pivot member which has a pressure finger acting with its free end portion on the outer end of the two carbon brushes, the is pivoted in recesses provided opposite one another in the two plate parts, characterized in that the lateral edges of the recesses (m, n) facing the guide slot (e) are one of the flow direction "treatment of the carbon brushes (/) show a deviating course. 2. Brush holder according to claim 1, characterized in that the edges are inclined and are arranged in a V-shape for each recess (ni, n). Considered publications:
German Patent No. 497341;
Austrian Patent No. 61739;
Swiss patents No. 64 568,
277,794;
French patent specification No. 1264203. 1 sheet of drawings 709 718/153 12.67 © Bundesdruckerei Berlin