DE1917868U - SWITCH WITH DOUBLE-INTERRUPTING FRICTIONAL SWITCHING CONTACT ARRANGEMENT. - Google Patents

Description

? A. 082 687 * 17.2.65 ίϋ

MAX STiGMANN clock and electrical equipment factory ■ Donaueschingen sheet 1-

Utility model

Switch with double-breaking friction-switching contact arrangement.

It is known that the contact resistance in electrical Contacts if it is through oxide or other foreign layers caused can be reduced by placing the contacts on one another during the switching process lets slide. This measure is particularly recommended when the contact pressures are relatively low is being worked, as it may happen that the pressure is no longer sufficient, an insulating foreign layer to pierce, in which case no contact is made at all.

In the case of a switch with a double-breaking bar contact According to the invention, the frictional contact is achieved in that the contact surfaces are inclined and the contact bar can be displaced perpendicular to the actuating plunger in an elongated hole.

Instead of an elongated hole, one opposite the actuating plunger can also be used correspondingly larger bore can be provided. It is particularly advantageous on the actuating plunger a spring to be arranged above and below the contact bar, the force of the lower spring being greater is than the force of the upper spring. To ensure a reliable shift, it is particularly important to to keep the friction between the contact bar and the actuating plunger small, e.g. by using a sleeve-like washer can be done.

The drawing shows an embodiment of the switch according to the invention.

When you press the actuating plunger 1 in the direction of the arrow, the contact bar 2 moves upwards on the so-called Working contacts 3 and 6 closed. If the semicircular contacts of the contact bar 2 touch the surfaces of the working contacts 5 and 6 that are inclined according to the invention, then the bar 2 is printed to the right, which is made possible by the elongated hole 7. The contact surfaces rub against each other, so that thin insulating or poorly conductive strips such as dust etc. on the contacts, wiped away will.

—2 -

RA. 082 687 * 17-2.85

MAX STEGMANN ■ Clock and electrical equipment factory · Donaueschingen sheet -2-

The actuation plunger 1 is above and below of the contact bar 2 each have a spring 8 and 9 arranged; Is between the lower spring 9 and the contact bar a spout-like washer 10 arranged so that it touches the contact bar with its concave part.

If you release the actuating plunger 1, it moves
the 3alken 2, pressed by the compression spring 8, down to the normally closed contacts 3 and 4. The surfaces of the normally closed contacts ~ j and 4, like those of the normally open contacts 3 and 6, are inclined so that the bar only
shifted to the left when its contacts die
Touch idle contact.

The elongated hole in the contact bar is dimensioned so that the Contacts can only rub against the mating contacts within a small area.

Claims (3)

1) Switch with double breaking, friction switching Contact arrangement, characterized, that for removing disruptive layers on the contacts inclined contacts and a contact bar that can be moved longitudinally at right angles to the actuating plunger (1) (2) is provided with an elongated hole (7) or a correspondingly larger hole. 2) Switch according to claim 1, characterized in that a spring (8, 9) is arranged on the actuating plunger (1) above and below the contact bar (2), the force of the lower spring (9) being greater than the force of upper spring (8). 3) Switch according to claim 2, characterized in that a spout-like washer (10) is arranged between the lower spring (9) and the contact bar (2).