DE607337C - Protection against interference on electrical machines - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
DECEMBER 21, 1934

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21di GROUP 67 oi

Elektrolux A.-G. in Berlin-Tempelhof *)

Interference protection on electrical machines Addition to patent 605

Patented in the German Empire on January 17, 1932 The main patent started on September 5, 1931.

The subject of the main patent is interference protection on electrical machines in the form of a »brush holder cap provided with a capacitor. The advantage of this Interference protection consists in the fact that a uniform element is created that can be used without the

... making any structural changes to any electrical machine attached can be. In order to improve this property of interference protection even further, according to the present invention suggested the contact between the brush holder cap and the machine housing to train resilient. The guiding principle for these measures is that the Brush holder constructions in the various models of electrical machines are designed in different ways, so that once the brush holder socket on and on other times it protrudes less from the housing. But since the brush holder cap, regardless of whether it is made of conductive or non-conductive material, when screwing on must always make contact with the housing, so it is desirable to to adapt the element to the different types of construction, the contact distance between To bridge the brush holder cap and the housing with an elastic intermediate member, that, if the space is small, stronger and, if the space is larger, is compressed less. The subject matter of the invention exists in the simplest embodiment from a spring inserted into the brush holder cap, which protrudes over the open edge of the brush holder cap.

An embodiment of the invention is shown in the drawing.

Fig. Ι shows a central section,

Fig. 2 is a center section offset by 90 ° with a view of the inserted Condenser from the left.

The brush holder cap consists of a closed at the bottom metal cap a, * 5 showing expediently at two sides, as shown in FIG. 2, is laterally pressed flat, so that there arise two surfaces b, on which a tool such. B. a key can be placed to screw on the cap. Inside the metal cap is an insert body made of insulating material c. This has a hole d with thread e in the middle, by means of which the cap is screwed onto the brush neck connector. The insulating body c, which is expediently made of compressible insulating material, ζ. Β. Synthetic resin ο. Like., There is a rectangular depression at the top into which a capacitor / is inserted. The coverings of the capacitor are with

*) The patent seeker stated as the inventor:

Wilhelm Oelniann in Berlin-Lichterfelde.

607387

two metal tongues g and h connected, which protrude in sufficient length from the capacitor. One tongue g has the shape of a narrow brass strip which is bent into a vertical groove i in the insulating body and placed in it. The course of the tongue is g in FIG. Ι visible, their width and position in the payload of Figure 2. The depth of the groove is indicated χ i in Fig. Ι ίο by the measurement.. In addition to the tongue g , a specially designed tongue is inserted into this groove. It is bent from a piece of wire. The two ends k of this spring are bent approximately hook-shaped into the horizontal plane, then the spring with its parts k ¹ extends down the length of the Nuti, then these parts diverge by forming two approximately semicircular spring legs k ² , which meet again in the bends k ^s and from then on they close ^{to form a ring έ 4.} The whole spring is thus, so to speak, a double ring that runs upwards into the hook-shaped ends. The lower contact tongue h- is bent down and with its end ¹ through a slot / a contact plate m, the z. B. consists of brass or copper sheet, inserted through, this Plattem is applied against the lower surface of the capacitor, so that the contact tongue h lies between the sheet m and the capacitor. You can then put the end h ¹ around the end m ^{1 of} the plate m downwards in order to secure the position of the sheet metal m to the capacitor / and to ensure good contact over the entire length of the tongue. After the contact tongue h is connected to the contact plate m in the prescribed manner, the capacitor is inserted into the rectangular opening <o; intestine, the upper tongue g, as described earlier, is bent down and inserted into the groove i. The spring with its legs k and k ¹ is then additionally inserted into this and then the outer metal cap α is pressed onto the insulating body c with a press fit. As a result of the press-fit fastening, the capacitor is firmly pressed in between the bottom of the metal cap and the insulating body and is absolutely secured in this position. On the other hand, the same thing happens with the spring, the legs k and k ^{1 of} which are now firmly seated between the insulating body and the cap, the legs k and k ^{1 of} the spring being firmly and conductively connected to the contact tongue g . The contact is therefore reliable. The spring of the brush or else directly the end face of the conductive brush holder sleeve or any intermediate contact members rests against the inner plate m. The ring spring protruding sufficiently far beyond the edge of the cap rests against the machine housing when the cap is screwed onto the brush holder 6g and thereby ensures reliable contact with the associated capacitor coating. The rather extensive compressibility of the spring means that the edge of the brush holder cap can remain at a certain variable distance from the housing, since the distance between the cap and the housing is bridged by the contact-making spring k.

Claims (5)

Patent claims: 1. Interference protection according to patent 605 322, characterized in that the housing closure by one arranged on the brush holder cap over the free edge. the spring protruding from the brush holder cap is effected. 2. Interference protection according to claim 1, characterized by an insert body Insulating material in which the capacitor lies in a recess and through the bottom of the pressed-on brush holder cap is held while the spring is partially in another recess of the insert body and therein is held by the jacket of the pressed-on brush holder cap. 3. Interference protection according to claim 2, characterized by a contact plate (m) arranged at the bottom of the inner threaded bore of the brush holder cap, which is conductively connected to one of the contact tongue of the capacitor passed through an opening (Z) of this plate. 4. Interference protection according to claim 2, characterized in that the spring made of wire is bent in the form of a double ring spring (k ² , W) , the upwardly directed, appropriately hook-shaped bent ends (k, k ¹ ) between the insulating body and the brush holder cap are pressed in. 5. Interference protection according to claim 4, characterized in that a groove (Ϊ) is introduced into the insulating body, the width of which corresponds approximately to twice the wire thickness of the spring and in which a capacitor contact tongue (g) of the same width is inserted. 1 sheet of drawings