Electrical switching device
View Patent ↗An electric switching device includes first and second switch contact pieces. The first switch contact piece has a guide portion. The first switch contact piece is connected to an actuating unit or drive device by a kinematic chain. The guide portion of the first switch contact piece is guided on a guide path. The guide portion and the guide path each have a contact or bearing surface and at least one of the contact or bearing surfaces is convexly curved.
1. An electrical switching device, comprising:
a first switch contact piece and a second switch contact piece;
a guide path;
said first switch contact piece having a guide portion being displaceably guided along said guide path, said first switch contact piece having a slot formed therein and said slot having a flank;
an actuating unit; and
a kinematic linkage connecting said actuating unit at least to said first switch contact piece for generating a relative movement between said switch contact pieces, said kinematic linkage having an entraining element engaging in said slot, and said entraining element having a planar contact surface lying against said flank of said slot;
said guide portion and said guide path being part of a rotate and slide joint connected to said kinematic linkage.
2. The electrical switching device according to claim 1 , wherein:
said guide portion includes a contact surface lying on said guide path;
said guide path includes a contact surface lying on said guide portion; and
at least one of said contact surfaces is convexly curved.
3. The electrical switching device according to claim 1 , wherein one of said contact surfaces is planar.
4. The electrical switching device according to claim 1 , which further comprises an actuating lever on which said entraining element is rotatably mounted.
5. The electrical switching device according to claim 4 , wherein said actuating lever is pivotable.
6. The electrical switching device according to claim 4 , which further comprises an abrasion-proof, rotatably-mounted bushing enclosing said entraining element.
7. The electrical switching device according to claim 2 , wherein at least one of said contact surfaces has an abrasion-proof insert.