DE353763C - Armored switch contact - Google Patents

Description

GERMAN EMPIRE

ISSUED MAY 24, 1922

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 c GROUP 39

Marie Beutl née Mouca in Vienna.

Armored switch contact. Patented in the German Empire on June 29, 1920.

According to the Union Treaty of June 2, 1911, the priority for this registration is due of the registration in Austria of October 31, 1917.

There are already iSdhaltkontakte known in which, such. B. in the patent 294249, the ^{change in shape of the contact heather leaves caused by the heating 1} is canceled by the fact that the contact sheets are made of metals with different temperature coefficients.

© ei these stop contacts there is a throttling the Joule effect is not cheaper, which is due to the freedom from deformation of this Sehaltfcontakte (see Aibb. 6) emerges.

To therefore with electrical Srihalteinriohtungen without exact fitting and without grinding a good .sehaltkontäkt

to achieve, which at the same time by virtue of limiting the current crossing points of its arrangement 'to the Joule effect in' equipped to the elastic 'Kontaktscheidenlblätter a from a non-elastic coupling sleeve c (Abib. 3) or with a non-elastic Drahtutnschniürung d (Fig. 4) izylindrisoher form. The arrangement is such made that during the driving of the contact blade b, the contact vaginal leaves α to 'the inclined planes 1, 2, 3, 4 of the union "pod c or Drahtumschnürung d (under bending of the elastic contact vaginal leaves a transverse to the blowing direction of the knife b) slide, whereby a flat fourfold linear contact pressure (Fig. 3b) or an intimate contact surface pressure (Fig. 3a) arises in the case of a slightly curved knife profile.

The curvature of the knife profile is kept so that when the knife is heated Area of the pressing or application of the contact blade leaves grows from the tangent tangent; this case can be seen in full in Fig. 3a. The deflection the contact blade leaves as well as the curvature of the profile of the contact blade shown in exaggerated form in Fig. 3b and 3a.

In the first case, an effect analogous to that of the usual point or Line contacts (Fig. 1), achieved in the second case as with normal surface contacts. Since the line pressure or surface pressure of the armored switch contacts increases with increasing heating, the Joule effect is limited by the action of the sleeve or the wire wrapping, so that in this respect the risk of deformation or burns is eliminated with these contacts. There is no fixed connection between the sleeve c or the wire lacing d and the contact blade blades α . 'I

The inelastic union sleeves c or i the wire lugs d of the armored j switch contacts can be in all shapes j which allow the contact sheaths to slide off the inclined planes 1, 2, 3, 4 (or if the contact sheet is attached to the side only on the inclined planes 1 and 2) of the throw-over sleeves and wire wrappings when driving in the contact blade. The same applies to the contact blades and elastic contact blade sheets, which allow the latter to bend transversely to the driving direction of the contact blades. The prerequisite is that the contact blades b are beveled at the bottom for the purpose of bending the blades a.

For high currents, the armored switch contacts can be assembled into contact batteries will. These switching contacts are not only suitable for straight knife guidance, Sondlern means corresponding construction of the switchgear also for Rotary movement of the contact blades.

In Fig. 5, the armored SchalÖcontakt is designed as a branch terminal or as a line carrier, where e is the movable busbar and / the branch terminal or. represents the Leitiungträger on which the Schaid'enblätter α are attached.

Claims (1)

Patent claim: Reinforced switching contact for electrical switching devices to limit the Joule effect, characterized in that the elastic contact sheath sheets (0) are enclosed by an inelastic and, fitting Überwunfshülse (c) or wire wrap ^ d) of such a shape that the 'Kontaiktschei- ■ denblätter when Driving in the IContaktmeS'Sers suffers a deflection transversely to the driving direction of the contact knife while sliding on the inclined planes of the cap sleeve or the wire wrapping, whereby a 'line or surface pressure arises at the junction point of the contact parts, whereby this pressure increases when the contact parts are heated . 1 sheet of drawings.