Patent ID: 8286955
Filing Date: 2012-10-16
Classification: B23Q

Abstract:
1. A steady rest for clamping and/or for holding a workpiece (W) on a machine tool, comprising three holding members ( 3 , 4 , 5 ) mounted in a housing ( 2 ) and displaceable in a common plane, of which the two outer holding members ( 3 , 4 ) are designed as two-armed levers disposed in a mirror image to one another and supported pivotably within the housing ( 2 ), and the central holding member ( 5 ) is guided moveably radially in a straight line to a tool axis, the central holding member ( 5 ) having control surfaces ( 8 , 9 ) which interact with the free ends of the outer holding members ( 3 , 4 ) in order to convert a closing movement of the central holding member ( 5 ) directed towards the tool axis (W) into a pivot movement of the outer holding members ( 3 , 4 ) in the clamping position of the latter, and the two outer holding members ( 3 , 4 ) being kinematically connected respectively to the central holding member ( 5 ) via an angle lever ( 10 , 11 ) so that with an opening movement of the central holding member ( 5 ) directed away from the workpiece the outer holding members ( 3 , 4 ) are pivoted apart from one another into their open position, characterised in that the angle levers ( 10 , 11 ) are linked rotatably to the central holding member ( 5 ) and respectively the one leg of the angle levers ( 10 , 11 ) is connected to the associated outer holding member ( 3 , 4 ), and the other leg is connected to the housing ( 2 ) by means of gate/pin arrangements.