Clamping or chucking system for a grinding wheel or disk

Chucking or clamping system for connecting a grinding wheel or disk (3) to a drive spindle (11) having

• a disk holding bushing (1) formed with an end surface for engagement with the grinding disk (3) at one end of the bushing and further formed with means coaxial with the grinding disk, for selectively releasably coupling the bushing (1) to the spindle (11),
• wherein said releasable coupling means comprises
• a coaxial cylindrical bore (8) formed in the holding bushing (1);
• a hydraulic expansion system formed on one end portion of the spindle (11, 12) and located in the bore (8) of the holding bushing (1),
• said hydraulic expansion system including
• a radially expansible thin-walled expansion sleeve (13), a hydraulic pressure chamber (15) defined within said expansion sleeve for reception of a hydraulic pressure fluid, an axially movable fluid compression piston (17) extending into the pressure chamber, and
• an axially movable engagement element (18) which is externally accessible and operatively coupled to the fluid piston,
• said expansion sleeve, upon being subjected to hydraulic pressure, expanding to clamp the spindle (11, 12) coaxially in the bore (8) of the holding bushing (1);
• and an interengaging axially latching safety locking means (25-30) coupled, respectively, to the spindle (11, 12) and the disk holding bushing (1), and movable to interengage and latch together said spindle and said bushing,
• said engagement element (18) being operatively coupled to said interengaging safety locking means for, simultaneously, upon axial movement of said engagement element,
• (a) interengagingly attaching the safety locking means (25-30) to latch together the spindle (11, 12) and the disk holding bushing (11);
• and
• (b) applying, via said compression piston (17), hydraulic pressure on the pressure fluid in said chamber (15) to thereby coaxially clamp the holding bushing (1) and the spindle (11, 12) together.