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1. WO2021001465 - ELECTRICAL CONTACT SYSTEM FOR A SWITCHING DEVICE

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[ EN ]

Claims

1: An electrical contact system (2) for a switching device (1), comprising:

at least one pair of contacts (3) having one fixed contact piece (4), which is attached to a first busbar (6) with a fixed location relative to the housing (33) of the switching device, and one contact piece (5) that is movable relative to the fixed contact piece (4) wherein the contact piece (5) is coupled to a slide (15) and is movable by the slide (15) in such a manner that the pair of contacts (3) are opened and closed relative to one another;

one planar contact piece carrier (7), to which the movable contact piece (5) is attached, wherein the contact piece carrier (7) extends in the longitudinal section thereof along the longitudinal axis (34) thereof from a first end (11) to a second end (12), wherein the first end (11) is attached to a second busbar (13), whose position is fixed relative to the housing (33) of the switching device, wherein the second end (12) of the contact piece carrier (7) is coupled to the slide (15); and

a spring element (18) having a first spring arm section (22) and a second spring arm section (23) and a pressure region (24) arranged between them in the area of the movable contact piece (5);

characterized in that the first spring arm section (22) is attached to the second busbar (13) at the first end (11) of the contact piece carrier (7), and the second spring arm section (23) is coupled at the free end (21) thereof to the slide (15) in such a manner that the spring element (18) exerts a contact force (26) on the movable contact piece (5) via the pressure region (24).

2. The electrical contact system (2) according to claim 1, characterized in that the spring element (18) presses on the movable contact piece (5) via the pressure region (24) even when the pair of contacts (3) is electrically opened.

3. The electrical contact system (2) according to claim 1, characterized in that the spring element (18) is bent in the area of the pressure region (24) in such a manner that it has a V-shaped cross-section in longitudinal section at least in the area of the pressure region (24).

4. The electrical contact system (2) according to claim 1 or 2, characterized in that the spring element (18) has a lower electrical conductivity than copper or has an electrically insulating coating.

5. The electrical contact system (2) according to any of the preceding claims, characterized in that the spring element (18) is produced from a paramagnetic or alternatively a diamagnetic material.

6. The electrical contact system (2) according to claim 5, characterized in that the spring element (18) is produced from stainless steel or a stainless steel alloy.

7. The electrical contact system (2) according to any of the preceding claims, characterized in that the contact piece carrier (7) is attached to the second busbar (13) in such a manner that together with the latter it forms a V-shape or a U-shape in longitudinal section along the longitudinal axis.

8. The electrical contact system (2) according to any of the preceding claims, characterized in that the contact system (2) encompasses multiple pairs of contacts (3a, 3b), wherein multiple movable contact pieces (5a, 5b) are arranged on the contact piece carrier (7) transversely to its longitudinal axis or one after the other in the direction of the longitudinal axis or transversely to the longitudinal axis, but offset in the direction of the longitudinal axis.

9. The electrical contact system (2) according to claim 8, characterized in that the

spring element (18) is constructed as a leaf spring.

10. The electrical contact system (2) according to claim 8, characterized in that the spring element (18) is constructed having separate spring arms (20a, 20b) for each pair of contacts (3a, 3b).

11. The electrical contact system (2) according to any of the preceding claims, characterized in that the at least one movable contact piece (5a; 5b) stretches through a corresponding mounting hole in the contact piece carrier (7) with a projection produced on its reverse side and that the at least one spring arm (20a; 20b) has a widened ring-shaped section (29a; 29b) with a central recess (30a; 30b) in the area of the pressure regions (24a; 24b) that runs transversely to the longitudinal axis of the contact piece carrier (7) and is positioned in such a way that it rests on the contact piece carrier (7) when preloaded and that the projection produced (32a; 32b) is located on the reverse side of the movable contact piece (7) inside the recess (30a; 30b).

12. The electrical contact system (2) according to claim 11, characterized in that the at least one spring arm (20a; 20b) has two pressure regions (24a; 24b) in opposing positions of the widened ring-shaped section (29a; 29b).

13. The electrical contact system (2) according to any of the preceding claims, characterized in that the slide (15) has a recess (35) into which the second end (12) of the contact piece carrier (7) and the free end (21) of the second spring arm section (23) of the spring element (18) project.

14. A switching device (1), comprising an electrical contact system (2) according to one of the claims 1 to 13.

15. The switching device (1) according to claim 14, further comprising an exciter coil and an armature (14), that has an operative connection to the slide (15) as a mechanical coupling element (15), characterized in that a force is generated by the exciter coil due to the magnetic field it generates which is transferred to the contact system (2) by the armature (14) and the mechanical coupling element, so that the contact system is switched by the exciter coil.

16. The switching device (1) according to any of claims 14 or 15, characterized in that the switching device (1) is a relay or comprises a relay.