Rohrzentriervorrichtung.

摘要

A mechanism for mounting a generally circular, hollow pipe (54) coaxial with a machine tool has a central shaft (10) with a dome-shaped head (12). A number of fingers (20) are equi-angularly spaced about the shaft (10) and pivoted at one end on the head (12). The fingers (20) in effect form a segmented cone. A collar (24) is slidably mounted on the shaft (10) and is coupled to the fingers (20) by respective connecting members (30) such that sliding movement of the collar (24) towards and away from the head (12) pivots the fingers (20) radially of the shaft (10). In use, the open end of the pipe (54) is located over the mechanism and the position of the collar (24) adjusted to expand the fingers (20) to grip the inner wall of the pipe (54) and hold the pipe firmly coaxial with the shaft (10). The end of the latter remote from the head (12) is secured to a machine tool axis to enable accurate machining of the pipe (54) by suitable tools which are mounted for movement about the machine tool axis.