Patent ID: 8955419
Filing Date: 2015-02-17
Classification: B23Q,Y10T

Abstract:
1. A steady rest for centering a rotationally symmetrical workpiece in space, the steady rest comprising: two housing halves spaced from one another and interconnected, a plate-shaped middle piece disposed between said two housing halves and mounted in said housing halves by an actuator piston, and moveable axially to the workpiece, two linear guide grooves disposed in two opposite end faces of said middle piece, with said linear guide grooves extending in a cross-shaped arrangement and at an angle to a movement direction of said middle piece, two outer steady rest arms, each moveably mounted in one of said linear guide grooves of said middle piece, and a middle steady rest arm attached to said middle piece between said outer steady rest arms, wherein two guide strips adjustable in a movement direction are disposed between said two housing halves, and a curved guide cam is disposed in each of said guide strips, each of said guide cams being provided with a guide pin attached therein and allocated to a free end of said two outer steady rest arms on said middle piece, the guide pin being disposed in one of said guide cams in an axially movable arrangement, the positions of said middle piece in relation to a distance between said middle piece and the workpiece to be clamped being adjustable by means of a first half shell with a sickle-shaped, curved, cross section, the positions of said two guide strips being changeable in relation to one another by a second sickle-shaped, curved half shell in opposite directions in a synchronised manner, and wherein the two half shells are disposed in line in a movement direction of said middle piece and are separated from one another by a compensation arm moveable axially in the two housing shells and forming a contact surface for an end position of said middle piece.