Chuck

A chuck comprising a chuck body having therein at least two guide grooves extending in a radial direction, a clamping jaw disposed in a movable arrangement in each of the guide grooves, the clamping jaw being provided with helical gearing extending in the direction of the body and a wedge rod movably mounted in the chuck body and the wedge rod being in a driving connection with a helical gearing of a clamping jaw, by means of a helical gearing disposed on the wedge rod, with a through-hole in the chuck body which emerges in a guide groove,

• wherein a sealing body is disposed on each of the guide grooves in an area of the through-hole, by means of which the guide groove is separated from the through-hole, and by means of which the clamping jaw can be moved, such that the clamping jaw and the sealing body effect airtight, and/or watertight, contact with one another,
• and a sealing orifice is disposed on opposite ends of the clamping jaws, with an outer contour of the sealing orifice being adapted to the inner contour of the guide groove, and the sealing orifice and the guide groove effect airtight and/or watertight contact with one another
• and that a sealing comb is provided in the chuck body in an area of the wedge rod and running generally at right angles thereto, such that the sealing comb engages in the helical gearing of the wedge rod and is driven to move radially during advance of the clamping jaws.