PRÄZISIONSSPANNFUTTER.

摘要

In a chuck a plunger (64) slidably fitted into a body (40) is provided with wedge-shaped projections (65) and a plurality of jaws (46) which are coupled to the projections in such a manner that they are displaced in a radial direction with respect to the body in response to displacement of the plunger. The engaging portion of each jaw (46) with the respective wedge projection (65) is defined at the radial centre of the jaw (46). The body (40) is a unitary structure and is formed with a guide surface (42) which is in sliding contact with the plunger (64) over the whole range of displacement of the plunger, and a bearing surface for supporting the inner and/or outer peripheral surface of the wedge is defined in the guide surface (42).