DE399155C - Switching device - Google Patents

Description

In technology, it is often necessary to operate strong electrical currents in to interrupt a rapid sequence, so z. B. in electrical resistance welding machines, their 'primary transformer current for seam welds has to be interrupted up to 2om times per second. The interruption contacts must be strong be so as not to be destroyed too quickly

ίο, and it causes certain difficulties Such heavy contacts operate with such a high number of vibrations because of the speed at which the switching contacts collide, a heavy load on the entire system and a heavy one Make noise.

Attempts have already been made with success to remedy these evils by inevitable Movement or control of the contacts to

so fix it by making the contacts then yourself at higher switching speed gently on top of each other, however, they have so far devices used have various disadvantages in that they have a very complex

as ed mechanism need and also make several drive devices (eccentric ο. Like.) Required to several To operate contact points (breaker points).

The aim of the invention is to create an arrangement in which it is possible to move two or more contact points with the help of a single drive element or to be controlled in such a way that the contacts gently touch each other even at maximum speed. How this is to be achieved is shown in the drawing in a simple embodiment.

a, a ¹ and a ² are pivotably arranged contact levers, which with their upper ends z. B. are hinged to pins b, b ¹ and b ^2. At their lower ends, the contact levers α and a ² each have a hinge c or c ² , while the contact lever a ^{1 is provided} with a double hinge c ¹ . As the figure shows, these hinges are connected to one another by rods, etc. d and d ^{1 in} such a way that a movement of the central contact lever a ¹ inevitably causes a movement of the other two contact levers σ and a ² , so that those on the contact levers also move Contact bodies e, e ¹ and e ² are moved against one another.

At the lower end of the middle contact lever a ¹ , a link / is now also arranged, which can expediently be resiliently connected to the contact lever. In this setting, a pin g is mounted, which is eccentrically attached to the disk h , so that a reciprocating movement of the connecting element and of the contact lever ¹ occurs when the disk h rotates about the axis i. This pendulum movement of the contact carrier α ¹ is now transmitted through the rods d and d ¹ to the other contact carriers α and α ² , in such a way that a certain angular movement of the central contact carrier α ¹ always results in a smaller angular movement of the outer contact carriers α and α ² in the same direction. This ensures that the external contacts e and e ^{2 of} the movement of the center contact e ¹ in the

Lead the closing movement and lag behind the opening movement, which has the consequence that the contacts touch each other gently even at the highest switching speed and when the contact point is opened, separate from each other only slowly, so that the spark formation is suppressed to a minimum by the opening sparks in a known manner when traversing the voltage curve

ίο of the current through the zero value by itself go out.

According to the invention, the rods d and d ¹ can be lengthened or shortened by means of nuts k and k ¹ , which run on right-hand and left-hand threads, for the purpose of setting the switching device, i.e. to influence the lead or lag of the contacts. The hinges c, c ¹

ao and c ² are arranged adjustable on the contact levers α, α ¹ and α ^2.

The contact levers α, α ¹ and α ² can expediently be rigid above the contact bodies e, e ¹ and e ² , below the contact bodies

as expediently designed to be resilient. The rods d and d ¹ can also be resilient in the longitudinal direction.

Claims (3)

Patent Claims: i. Switching device, characterized in that the switching contacts {e, e ¹ and e ² ) are controlled in such a way that both contact bodies causing the contact closure are moved at different speeds, so that one contact body (e ¹ ) when the contact closes the mating contact (e or e ² ) must catch up, while the latter follows the former contact body (e ¹ ) at a slower speed when contact is interrupted. 2. Switching device according to claim 1, characterized in that the counter-contact body (e and e ²⁾ from the other contact (e ¹⁾ carrying the contact lever (α ¹⁾ by means of force-transmitting organ (d and d ¹⁾ moves toggle lever-like manner. 3. Switching device according to claim 1, characterized in that all Contact body from a common drive member, e.g. B. a crank device, be moved.