Clamp mechanism for rotary tool disc

A clamping assembly for applying a clamping force to an accessory on the output shaft of a rotary tool and said assembly adjustable from a first position with a first stack height to a second position with a second stack height less than the first stack height, whereby said clamping force is substantially released, said clamping assembly comprising:

• a flange nut threadably engageable with the output shaft;
• a clamp flange operatively connected to the flange nut;
• a thrust plate mounted between the flange nut and clamp flange and operatively engageable with one of the clamp flange and the flange nut and comprising a first axial surface and a second axial surface and defining a plurality of axial penetrations;
• a first roller cage defining a first plurality of penetrations and rotatably mounted between the thrust plate and the clamp flange;
• a first plurality of rolling elements rotatably mounted in the penetrations of the first roller cage;
• a second roller cage defining a second plurality of penetrations and rotatably mounted between the thrust plate and the flange nut;
• a second plurality of rolling elements rotatably mounted in the penetrations of the second roller cage;
• a ring collar rotatably mounted between the clamp flange and the flange nut and surrounding the thrust plate, the first and second roller cages and the first and second rolling elements, and rotationally connected to the thrust plate, whereby rotation of the ring collar rotates the thrust plate relative to the first and second roller cages from the first position with the first stack height, wherein the first roller elements contact the first axial surface of the thrust plate and the second roller elements contact the second axial surface of the thrust plate, to the second position, wherein the first and second rolling elements are located in the axial penetrations in the thrust plate and thus establish the second stack height.