Patent ID: 7158388

Claim:
A contact element for providing an electrical connection between a back plate for insertable boards and an apparatus housing and/or a second back plate for insertable boards located at a side of the back plate, the back plate and the second back plate being located in parallel to each other and arranged in the apparatus housing, the back plate and the second back plate each having opposite large surfaces and narrow edge surfaces connecting the large surfaces, the contact element comprising: a main portion secured in a recess in the apparatus housing, the recess located at a side of an opening for the back plate in the apparatus housing; and at least one elastic first projection projecting from the main portion and acting with an elastic force along a line intersecting the main portion said line being substantially parallel to a plane in which the back plate is located, when the back plate is inserted in the opening and the main portion is secured in the recess, such that the at least one elastic first projection contacts the back plate only at an one of the narrow edge surfaces thereof.