Importance

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Abstract

Hydromechanical clamping device which in one end thereof is designed as a mandrel pin with an outer envelope surface onto which one or more tools may be mounted. The mandrel pin 5 comprises outer expanding means (6), the outer surface of which consisting of said envelope surface, with a relatively thin, radially expandable wall and a conical inner surface in the axial direction, the mandrel pin further comprising a centre pin (8), the outer diameter of which being smaller than 10 the diameter of the inner surface of said means, wherein in the space between the centre pin (8) and the expanding means there are arranged intermediate means (7) connected to a piston (9). The intermediate means (7) are displaceable in the axial direction by means of hydraulically operating means, 15 wherein the intermediate means (7) and the outer expanding means (6) have interacting conical surfaces which at axial displacement of the intermediate means in one direction cause radial expansion of the outer expanding means (6), wherein axial displacement of the intermediate means in the other 20 direction causes relief with radial contraction of the outer expanding means (6).

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First Claim