Clamping device

In a support member for mounting on a machine;

• a tool holder having a shank on one end and an insert supporting portion on an opposite end, a bore formed in said support member, an intermediate unit fixed in said bore, said intermediate unit having an axial perforation formed therein, recesses extending radially inwardly of said intermediate unit and intersecting said axial perforation, outwardly movable clamp elements disposed in said recesses, said shank having an aperture formed along its axis and adapted for telescopic engagement over one end of said intermediate unit, cooperating surfaces of abutment means on said clamp elements and in said aperture, an actuator element in said intermediate unit to engage and move said clamp elements, and means for moving said actuator element so that said cooperating surfaces of abutment are engaged to lock said tool holder on said intermediate unit.

An intermediate unit for locking a shank of a tool holder to a machine support member, said intermediate unit comprising;

• a tubular element having opposite ends and adapted for mounting in a bore in the support member on the axis of the bore and with one end engaging the support member at the bottom of the bore, the other end of said tubular element adapted for telescopically engaging a perforation formed in the shank of the tool holder, an axial perforation formed in said tubular element, radial holes in said tubular element intersecting said axial perforations, outwardly movable clamp elements disposed in said radial holes and an actuating element in said axial perforation for moving said clamp elements radially, abutment surfaces on the outer ends of said clamp elements for cooperating with an abutment surface located in the axial perforation of said tubular element, and actuating means for moving said actuator element axially in said perforation so that the abutment surfaces on the clamp elements can engage the abutment surface in the perforation of a tool holder in the support member bore and surrounding said tubular element.

In combination;

• a support member especially for mounting on a machine, a tool holder having a shank with a free inner end and an insert supporting portion on the other end and a first abutment facing the free end, said support member having a bore to receive said shank inner end foremost and havng a second abutment to engage said first abutment, an axial hole formed in said shank from the inner end thereof, radial holes extending inwardly in said shank and intersecting said axial hole and having axes disposed in a common plane substantially perpendicular to the axis of said axial hole, outwardly movable clamp elements disposed in said radial holes, cooperating surfaces of abutment means on said clamp elements and in said bore, and actuating means comprising a rod-like element mounted in said support member and having a portion movable into the axial hole in said shank from the inner end of the shank, said rod-like element havng a first position to urge said clamp elements radially outwardly in the respective radial holes so that said cooperating surfaces of abutment means engage and lock said tool holder against axial movement in said support member, said rod-like element having a second position in said support member disengaged from said clamp elements so that said tool holder is released for removal from or insertion into said bore in said support member.