Patent ID: 8783139

Claim:
A steady rest ( 1 ) for centering a rotationally symmetrical workpiece ( 12 ) in a space defined by a housing shell ( 2 ) and a housing cover ( 3 ) firmly connected together to form an interior space ( 4 ), the steady rest comprising: a guide slide ( 7 ) mounted in an axially adjustable arrangement in the interior space ( 4 ) and an actuator rod ( 5 ) connected to the guide slide ( 7 ); two control surfaces ( 8 ) formed facing opposite to one another on said guide slide ( 7 ), the control surfaces ( 8 ) being configured such that said guide slide ( 7 ) exhibits a triangular cross-sectional contour, one triangle tip of which points towards the workpiece ( 12 ) and two triangle tips point towards said actuator rod ( 5 ); a middle steady rest arm ( 6 ) in a driving connection with said actuator rod ( 5 ); and two outer steady rest arms ( 9 , 10 ) each arranged on a side adjacent said middle steady rest arm ( 6 ) and mounted in a swivelling arrangement in the housing shell ( 2 ) and the housing cover ( 3 ), and a first free end ( 11 ) of which is in contact with said control surface ( 8 ) of said guide slide ( 7 ), the second free end ( 13 ) on the opposite side of said rest arm gripping around the workpiece ( 12 ) to be clamped, thus forming a three-point mounting together with said middle steady rest arm ( 6 ) in order to hold the workpiece ( 12 ), wherein said actuator rod ( 5 ) is provided with a passage opening ( 14 ) extending therethrough, into which a force actuation element ( 15 ) is disposed, and the force actuation element ( 15 ) is in a form-locking active connection with a first and/or second adjustment device ( 31 and/or 32 ) by means of intermediate elements ( 16 , 17 , 20 , 30 , 35 ) such that when the workpiece ( 12 ) is clamped, the first adjustment device ( 31 ) is adapted to adjust said three steady rest arms ( 6 , 9 , 10 ) jointly and synchronously to one another in position for aligning the workpiece ( 12 ) in the clamped condition in the horizontal plane and the second adjustment device ( 32 ) is adapted to adjust the position of the two outer steady rest arms ( 9 , 10 ) for changing the position of the workpiece ( 12 ) in the clamped condition in the vertical plane.