DE1790035A1 - Electrical switch with an axially movable switch contact and a fixed contact that remains in contact with it - Google Patents

Description

., ing. EF. EITNER a a Aug. ig »

ERHARDTSTRASSE8

N.V. "COQ", Kanaalweg No. 72, Utrecht (Netherlands).

Electrical switch with an axially movable switch contact and a firm contact that remains in contact with it.

The invention relates to an electrical switch with an axially movable switch contact and one in contact therewith permanent, resilient, ring-shaped, fixed contact for the electrical conductive connection of this switch contact with the one through the switch circuit to be closed and interrupted.

The purpose of the invention is to create a permanent electrically conductive connection between a connection terminal of the switch and the axially movable switching contact, which connection has a simple design, takes up little space, can be easily arranged, has almost no braking effect on the movement of the switching contact, has no adverse effect on the electrical field in the switch and under all circumstances, ie * also during the switching of very large short-circuit currents, maintains a good conductive contact between the movable switch contact and the relevant fixed conductive files of the switch. According to the invention this is achieved by the use of a continuously cooperating with the movable switching contact fixed contact, consisting of a region surrounded by an annular ° holder and supported, zickzackfBrmig folded metal-O consists stripe _0, the a switch contact umklemmenden geu> schloesenea ring is bent, the inner diameter of which is in the free state of this ring smaller than the outer diameter of the Sohalt- ^ contact. If the switching contact is in the fixed contact in this version, the parts of the ziokzag-shaped folded,

annularly curved strip of the fixed contact a little out of the ' pivoted free position and the strip is with its on the inner circumference lying folds resiliently pressed against the switching contact. Through this, this ring comes with a large number of separately resilient linear ones Contact surfaces to lie against the switch contact, whereby under a good contact transition between the switch contact and the annularly bent strip is obtained. Through the In a zigzag shape, the strip has a large cooling surface, so that the solid contact is well cooled and can be heavily overloaded. . '' ■

It can advantageously be folded in a zigzag shape and folded into a ring Strip of the fixed contact be folded in such a way that its parts on the inner circumference of the Hinges in pairs in sharp folds of 180 to each other connect and thereby lie against each other in pairs. With this design, a greater elastic deformation is like resilient Contact lip-like pairs of parts of the zigzag stripe possible. Because the outer circumference of the strip bent into a ring is larger than the inner circumference thereof, the pairs of strip parts can be connected on the outer circumference of this ring with the adjacent pairs of strip parts by cylindrically curved parts, their radius through the radius of this outer circumference and through the number of pairs of strip parts is determined.

The invention will be explained in more detail with reference to the drawing. In it is:

Fig. 1 partially an axial section and partially a view of an axially movable switching contact arranged in a fixed contact a switch near the invention and

Fig. 2, on a larger scale, a cross section along the line II-II in Fig. 1.

009823/0606

In the drawing, 1 is part of a movable switch contact in the form of an axially movable switch pin. This switch contact is secured by a zigzag folded metal strip 2 permanently clamped, which is bent into a closed ring. This zigzag folded, annularly curved strip 2 is in one annular holder 3 taken to which the to be closed by the switch and the circuit to be interrupted is connected in a manner not shown will. The holder 5 and the strips together form one fixed contact in which the switching pin 1 is slidably arranged. Of the Fixed switching contact of the switch that cooperates with the switching pin has not been shown.

Fig. 2 shows how the strip 2 is folded and extends between the holder 3 and the switch pin. The strip 2 is folded in such a way that the folds 4 on the inner circumference of the ring formed by the strip 2 are as sharp as possible, so that the parts 2 ¹ and 2 ″ of the strip lie against one another in pairs. On the outer circumference of this ring are the pairs of strip parts 2 ¹ , 2 ^W connected to one another by cylindrically curved parts 5. Since the inner diameter of this ring is smaller than the outer diameter of the switching pin 1 in the free state of the ring formed by the strip 2, the pairs of strip parts 2 ¹ , 2 "are set aside be pressed when the switch pin is in firm contact, so that they come to press against the switch pin u with a certain spring force. The torque required by this spring force is absorbed by the cylindrically curved parts resting against the inner circumference of the annular holder 3, which in pairs form a relatively wide foot for each pair of strip parts 2 ', 2 ".

The movable switching contact can also be axially movable Be pipe contact.

009823 / 060S

Claims (2)

1790Ü35 Claim » 1 · Electrical switch with an axially movable switching contact and a resilient, ring-shaped, fixed contact that remains in contact with it for the electrically conductive connection of this switching contact with the one to be closed and closed by the switch
interrupting circuit, characterized in that the fixed
Contact from a surrounded by an annular holder (3) and
worn, zigzag folded metal strip (2) consists of
is bent to form a closed ring that clamps around the switch contact (1), the inner diameter of which in the free state of this ring is smaller than the outer diameter of the switch contact (1) * 2. Electrical switch according to claim 1, characterized in that « that the metal strip, which is bent into a hinge and folded in a zigzag shape fen (2) of the fixed contact is folded in such a way that its parts
(2 ¹ , 2 ^M ) on the inner circumference of this ring connect in pairs in sharp gaps (4) of 180 ° and thus in pairs against each other
lie". 3 · Electrical switch according to claim 2, characterized in that the pairs of strip parts 2 ', 2 "on the outer circumference of this ring with the adjacent pairs of strip ^{parts 2 1} , 2" are connected by cylindrically curved parts (5), the radius of which is through the Radius of this outer circumference and is determined by the number of pairs of strip parts (2 ·, 2 ^H ). P * t «nt« na / all 0.09823 / 0606