Patent ID: 7219886

Claim:
A clamping device for retaining a draw-in bolt on a machine table, comprising: a clamping plate having a receptacle into which the draw-in bolt is insertable from outside through an insertion opening; a clamping mechanism to immobilize the draw-in bolt in the receptacle; and a closure cap that is movable inside the receptacle between a closed position in which the insertion opening of the receptacle is closed off by the closure cap, and an operating position in which the closure cap is pushed below the insertion opening of the receptacle by the draw-in bolt, which is inserted into the receptacle and immobilized with the clamping mechanism, wherein a centering surface is implemented between an end surface of the closure cap an end surface of the draw-in bolt to pre-center the draw-in bolt when the end surfaces of the draw-in bolt and the closure cap contact each other to insert the draw-in bolt into the receptacle.