Patent ID: 8459919

Claim:
A fastening device comprising: at least one nut, at least one support unit, a first spring, and a second spring, wherein the first spring and the second spring exert a force between the nut and the support unit substantially in a direction of a longitudinal axis of the at least one nut, the at least one nut includes a base body with an aperture, the base body on an end region has a shoulder protruding outwardly from the aperture, the shoulder includes a lip, and the shoulder and the lip form a supporting surface, the first spring has an outside diameter that is at least substantially equal to an inside diameter of the lip of the shoulder of the at least one nut, and the first spring is located on the supporting surface, the second spring has an outside diameter that is at least substantially equal to an inside diameter of a side portion of the at least one support unit, and the second spring is located in a space between the at least one support unit and the at least one nut.