Abstract: A hydraulic chuck includes a center bore for receiving a tool shank. At least one closed cavity is disposed in the chuck body adjacent the bore and extend circumferentially by a distance less than 360 degrees. The cavity containing device communicates with the medium for pressurizing the medium to radially deform and expand the bore wall from a normal diameter to a larger diameter to enable the tool shank to be moved into or from the bore. A depressurizing of the medium causes the bore wall to radially retract to the normal diameter for clamping the member in the bore.

Abstract: A mounting tool for a hydromechanical chuck or mandrel of the type which is clamp connected using a pressure medium in order to clamp connecting a shaft or a shaft tool or a working piece, and in which said shaft or working piece is dismantled from the chuck, and which chuck using a pressure medium in the opposite direction, and which chuck is formed with two separate pressure chambers, a first chamber acting as a clamp connection chamber, and a second chamber acting as a dismantling chamber, which chambers are formed with inlets/outlets provided on opposite sides of the chuck and opening at the periphery thereof.