Patent ID: 8266992

Claim:
A steady rest for clamping of rod-shaped workpieces having a circular circumference on a lathe, the steady rest comprising three holding elements arranged in a common plane and provided with rollers, two outer ones of the holding elements being adapted to be swivelled about a pin mounted in a housing, and a middle holding element mounted in the housing and adapted to be movably adjusted axially, the middle holding element having a cam member mounted thereon, the cam member having inclined surfaces adapted to engage an end of each of the holding elements to engage the holding elements with a workpiece, the middle holding element being further adapted to supply coolant and lubricant to the workpiece by means of first and second ducts disposed in the housing and the middle holding element; wherein a leak-tight supply of coolant or lubricant for the middle holding element is provided by the ducts extending through the housing and into the middle holding element, and the ducts are connected together by an elastically deformable element ( 31 , 31 ′) disposed in a cavity in the housing.