DE2011044A1 - Small protection - Google Patents

Description

DR. BERG DFPL.-INQ-. STAPF

PATENT LAWYERS
8 MUNICH 12, KiU ^ LiiSTRASSE 2O

Attorney's file 19 389 Munich, March 9, 197o

Kleinschütz

The present invention relates to a miniature contactor with contact springs that can be actuated by an armature housed in the coil body.

When accommodating small contactors in electronic There is a risk that magnetic leakage fluxes will damage neighboring semiconductor circuits when the contactor is switched or magnetic core storage devices are disturbed and work incorrectly «, It is therefore It has already been proposed to move the air gap in the magnetic circuit of a miniature contactor into the inside of the coil, e.g. by using a diving anchor. at a well-known small contactor of this type are those to

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actuating contacts in chambers around the plunger arranged. It is also known to provide a soft iron housing in a plunger construction, which forms part of the magnetic circuit and surrounds the miniature contactor. This increases the risk of disturbing stray fluxes largely avoided. However, diving anchor designs have the disadvantage that they do a lot Take up space. Therefore, in tight spaces, they cannot be used in conjunction with the usual printed Circuits are used.

Relays of a particularly flat design have also already become known that are mounted on printed circuits easy to find space. In one of these relays, the coil is flat and the contacts are next to the Coil arranged on contact springs. These are operated by an anchor attached to them. The order the armature and the air gap outside the coil, however, has the disadvantage that relatively high leakage fluxes develop. In addition, this construction is not suitable for those to be switched by a miniature contactor relatively large currents, because no contact chambers are provided and cannot for reasons of space are provided.

The present invention is based on the object of creating a miniature contactor which does not have any disruptive leakage flux and is of such a flat and compact design that it can also be used in conjunction with printed circuits can be used.

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This is achieved according to the invention in that in a miniature contactor with contact springs which can be actuated by an armature housed in the coil body, the armature is carried against the core by the contact springs also housed in the coil body, which are isolated between the armature and a spacer is pressed to jIf to bridge dex energization of the coil has an air gap, which like in the coil body between a from one side projecting into the core and projecting from the other side yoke plate is formed and that the magnetic circuit through a ferromagnetic cover plate, the whole construction encloses, is closed.

The advantage of this arrangement is in particular that on the one hand by the arrangement of the air gap in the coil body, in connection with the through the cover closed magnetic circuit, magnetic leakage flux can be largely avoided and that on the other hand sufficient There is space for an arrangement of changeover contacts with large leakage current paths between the same.

■ * ■ "" ■ i

A preferred embodiment of the invention is characterized in that the ferromagnetic hood clamps the core and the yoke extension by placing them on the bobbin. This becomes a very easy assembly of the contactor elements achieved.

In a further advantageous embodiment of the invention, the coil body has an extension piece at one end in which contact chambers with partition walls are formed. This allows a particularly compact arrangement of the contact springs with large, against Dirt insensitive creepage paths. Also

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there is no risk of flashover due to ionization with three-phase switching.

Finally, a particularly advantageous embodiment of the invention is characterized by an inside of the coil housed plate-shaped contact spring holder, which is dimensioned such that the distance between the contact spring surfaces and the core on the contact spring holder is less than that φ thickness of the armature, and a spacer, which is also housed in the coil body, which the contact springs presses against the contact spring holder and has a length such that the dimension difference mentioned between the contact spring holder and the support point of the armature resulting bias of the Contact springs corresponds to the desired contact pressure.

The invention also relates to a method for producing a contactor. This procedure is thereby characterized in that spacers of various lengths are used to obtain the desired _ Generate contact pressure.

The method according to the invention forms the regulation the contact pressure during assembly without the aid of tools such as adjusting pliers and the like.

Further details emerge from the following description of the exemplary embodiment of the invention. It shows:

Fig. 1 is a perspective view of the contactor partially in section,

2 shows a longitudinal section through the contactor,

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Fig. 3 shows a section along the line: - IJ-I-III in. ■ ■. Fig. 2,

Fig. 4 is a view from above of the contact spring holder ■ with contact springs, insulating foil, armature and armature retaining spring,

Fig. 5 is a view from below of the contact spring holder with the spacer placed on it, inserted con * clock springs, insulating foil, armature and armature retaining spring.

As Fig. 1 shows, the contactor has a coil body 1, This consists essentially of the coil part 2, and the extension piece 3. In the extension piece 3 is a Number of contact chambers 4, e.g. four, provided. The individual contact chambers 4 are separated by partitions 5 separated from each other. In the extension piece 3 of the bobbin 1 there are two slots 7 and 8 for each contact chamber 4 for receiving contact pieces 9 and IO (Fig. 1 and 2). These contact pieces 9 and IO are in a suitable manner, e.g. by caulking in the approach- <j | piece 3 attached. The distance between the contact pieces 9 and 10 is thereby advantageously 'by means of approaches 7a and 8a. It would also be conceivable to attach the contact pieces 9 and 10 by casting in the Manufacture of the bobbin 1. The from. the end piece 3 protruding ends 13 and 14 of the contact, pieces 9 and 10 are advantageous for connecting Wires through a solder-free wound connection or through Soldering trained. Furthermore, there are two or more coil connection pieces in the extension piece 3 of the coil body 1 18 provided. These can be one for the coil wire

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Have soldering lug, which can be sunk into a recess in the coil body after soldering Saving space and relieving strain on the wire. It is also possible in the extension piece 3 pins that are still blind (not shown) should be provided in order to facilitate the wiring. Tn 2 is the winding 20 attached to the bobbin 1 and the cover tape 21 for this winding evident.

As can be seen from FIGS. 1 and 2, the contact springs 22 are located in the interior of the coil former 1. This results in a particularly flat design of the contactor enables. In the present exemplary embodiment, four changeover contacts are provided. But it is also conceivable to provide a smaller or a larger number. The contact springs 22 have the In the shape of an L, a silver contact 24, for example, being attached to the end of a leg 23. The other Leg 25 is designed for the connection of wires by a solder-free wound connection or by soldering. All connecting elements 13, 14, 18 and 25 can be arranged at modular distances from one another, so that when the miniature contactor is used in a circuit, the wiring can also be done mechanically can be.

into the
As can be seen particularly from Figures 2 and 3, all contact springs 22 are together from an L-

- * shaped contact spring holder 30 and a distance
to piece 36 held parallel to one another inside the coil. For this purpose, the contact spring holder 30 ^ is provided with grooves 31 running longitudinally to the coil axis (Fig.

- * ■ 3) provided, in which corresponding ribs 36a of the co

a> spacer 36 fit. The shorter arm 30a of the contact spring holder 30 is used to fix it in the longitudinal direction after it has been inserted into the coil body. The contact springs 22 are also shared

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sam surrounded by an insulating film 32 (FIGS. 4 and 5) and connected to the plate-shaped armature 34 by means of a clamp-shaped armature retaining spring 33. The armature 34 is expediently made of soft iron or another soft magnetic material. The armature 34 is provided on two sides with recesses 34a, into which corresponding lugs 31a of the contact spring holder 30 fit in order to fix the armature 34 in the longitudinal direction. The armature retaining spring 33 A

itself engages in grooves 35 of armature 34.

In the interior of the coil, the contact springs 22 lie on the one hand in the longitudinal grooves 31 of the contact spring holder 30, and on the other hand on a spacer plate 36. Both consist of an insulating material. The remaining space inside the coil is created by the core 37 completed. This can also consist of soft iron or another soft magnetic material. The core 37 has an angled portion 38 which prevents it from sliding into the interior of the coil. The bend 38 also ensures a good closure of the magnetic circuit from the core 37 to which the entire contactor. surrounding hood 40.

It should be noted that the contact spring holder 30 is dimensioned so that the distance between the on the contact spring holder 30 adjacent surface of the contact spring 22 and the core 37 is less than the thickness of the armature 34. This ensures that when the spacer 36 is pushed in, the contact springs 22 are pretensioned downward. By the change in the distance between that at the core 37 resting edge of the anchor 34 and the inner

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Edge of the nistanzstückes 36 can be controlled> for this purpose are advantageously provided Distanzstüclce 36 of different lengths, the bias of the contact springs 22, and thus the contact pressure, which is large depending on the used length of the contact pressure or smaller. In order to facilitate insertion, the spacer 36 is advantageously designed with axially aligned sliding ribs 36b on the side facing the inner wall of the coil part 2.

The bobbin 1 with the parts inserted therein is enclosed by the hood 40. This hood 40 consists of soft iron or another soft magnetic material. For example, it can be fastened in this way that at predetermined points 48, 49 of the hood the material in corresponding recesses 43, 44 of the bobbin 1 or of the contact spring holder 30 is pressed.

A U-shape is guided over the contact chambers 4 of the extension piece 3 and from this and the hood 40 Yoke plate 50 (FIG. 2) is inserted, one leg 51 of which is angled. The angled part of the leg 51 protrudes into grooves la (Fig. 3) of the bobbin 1 and is expediently aligned with the core 37, which is also passed through the groove la. The groove la ensures the permanent exact alignment of the core 37 with the leg 51 of the yoke plate 50. For the AC version of the miniature contactor, a short-circuit ring (not shown) can be attached to the leg 51 protruding into the coil body 1. be attached.

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The air gap 52 of the contactor is between the Leg 51 of the yoke plate 50 and the armature 34 is formed and is thus -in the interior of the coil 1, when the greatest concentration of lines of force prevails. These Contactor construction results in a very effective magnetic circuit, so that the efficiency of the miniature contactor and its working speed is high. In addition, the arrangement of the air gap in the Inside the coil, stray fluxes are largely the result.

The magnetic circuit of the miniature contactor is created by the core 37, the armature 34, the yoke 50 and the hood 40 are formed. It should be noted that both the leg 38 of the core 37 and the yoke plate 50 rest against the hood 40. By having the hood 40 as part of the magnetic Circle is used, is a further reduction of the thanks to the arrangement just described of the air gap is already low risk of leakage flux causes.

When the miniature contactor is actuated, the armature 34 is pulled against the core 37 and the yoke 50, so that the magnetic circuit is closed. In this position, the contact 24 rests on the contact piece 9.

The assembly of the miniature contactor turns out very well simple. The contact springs 22 are wrapped together with an insulating film 32 (Fig. 4 and 5) and by means of of the armature spring holder 33 attached to the armature 34. Then they are together with the core 37, the contact spring holder 30 and the spacer 36 are pushed into the interior of the bobbin 1. This takes place

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a bias of the contact springs 22 downwards. On the other side of the bobbin 1, the Yoke plate 50 pushed in. The bobbin 1 with the inserted parts can now be pressed into the hood 40 whereupon the material e.g. at points 48 and 49 of the hood 40 in corresponding recesses 43 and 44 is caulked in order to fasten the hood 40 and thus to hold all the components together.

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Claims (1)

Patent claims: l. | Miniature contactor with contact springs that can be actuated by an armature housed in the coil body, characterized in that the armature (34) of the also housed in the coil body (1) Contact springs (22) which are biased in isolation between the armature (34) and a spacer (36) are worn and against the core (37). pressed. when energizing the coil (20) a (J To bridge the air gap in the coil body (1) between a core protruding from one side (37) and a yoke plate (50) protruding from the other side is formed, and that the magnetic circuit through a ferromagnetic cover that encloses the entire construction, is closed. 2. Small contactor according to claim 1, characterized by a contact spring holder (30) made of insulating material, which is accommodated in the interior of the coil and which is dimensioned such that the distance between the surfaces of the contact springs (22) and the core (37) resting on the contact spring holder (30) is less than the thickness of the armature (34) and a spacer (36) which is also accommodated in the coil body (1) and which presses the contact springs (22) against the contact spring holder (30) and is of such a length that the due to the mentioned dimension difference between the contact spring holder (30), and the contact point of the armature (34) resulting bias of the contact springs (22) corresponds to the desired contact pressure. 109814/1360 3. Small contactor according to claim 1 or 2, characterized in that that the ferromagnetic hood (40), the core (37) and the yoke extension (51) through Put it on the bobbin. 4. Small contactor according to one of claims 1 to 3, characterized characterized in that the bobbin (1) having at one end an endpiece (3), in which contact chambers (4) excluded with partitions (5) m is shown. 5. Small contactor according to claim 4, characterized in that the distance between the contact pieces (9, 10) is determined by lugs (7a, 8a) in the extension piece (3) of the bobbin (1). 6. Small contactor according to one of claims 1 to 5, characterized characterized in that the core (37) is L-shaped, and that its bend (38) on the The hood (40). 7. Small contactor according to one of claims 2 to 6, characterized in that the contact spring holder (30) of ™ L-shaped, with its shorter arm (30a) between the coil body (1) and the hood (40) lies around the contact springs (22) in the coil body (1) to be fixed lengthways. 8. Small contactor according to one of claims 1 to 7, characterized in that the contact spring holder (30) over Part of its length has grooves (31), the depth and width of which is essentially the thickness and the Width of the contact spring (22) corresponds. 1098U / 1360 9. Small contactor according to claim 8, characterized in that that the spacer (36) has ribs (36a) which fit into the grooves (31) of the Kohtaktfederhaiters (30) fit. . 10. Small contactor according to one of claims 1 to 9, characterized characterized in that the spacer (36) has sliding ribs (36b) on the side facing the inner wall of the coil part (2). 11. Small contactor according to one of claims 1 to 10, characterized characterized in that the armature (34) on the insulated contact springs (22) with a spring clip (33) which is guided in the side recesses of the armature is attached. . 12. Small contactor according to one of claims 1 to 11, characterized in that the contact spring holder (30) has lugs (31a), which in corresponding , Grooves (34a) of the anchor (34) fit in order to hold it in the desired position. 13. Klein contactor according to any one of claims 1 to 12, characterized by DA λ that the coil terminals (18) have solder tails for the coil wire which are retractable after soldering in a recess in the spool body (1). 14. Small contactor according to one of claims 1 to 13, characterized characterized in that the yoke extension (51) from the extension piece (3) and the grooves (la) of the bobbin (1) and the hood (40) is performed. 15. Small contactor according to one of claims 1 to 14, characterized in that the spacer (36) for adjusting the contact springs (22) is adjustable in the longitudinal direction. 109814 / 1.360 20110A4 16. Small contactor according to one of claims 1 to 15, characterized characterized in that the contact springs (22), pins (9, 10) and coil connections (18) from the The coil formers (1) are led out without intermediate pieces and can be connected directly. 17. A method for producing small contactors according to any one of claims 1 to 16, characterized in that that spacers of different lengths are used to achieve the desired contact pressure produce. 12/29/69
C AR / ml
E-23-458 109814/1360