Tooling attachment adaptor assembly

An adaptor assembly for a tooling attachment for a machine tool, the machine tool including a spindle housing which at least in part encloses a spindle which is rotatable about an axis, said spindle housing including a sleeve which is co-axial with the axis of rotation of the spindle, the tooling attachment including a housing and a drive mechanism adapted to engage the spindle, said adaptor assembly comprising:

• an adaptor sleeve, said adaptor sleeve having first and second oppositely disposed ends, said adaptor sleeve having an internal diameter which is greater than the external diameter of the spindle housing sleeve whereby said adaptor sleeve may be positioned coaxially with respect to the spindle housing sleeve;
• means for releasably affixing the first end of said adaptor sleeve to the housing of the tooling attachment;
• radially expandable sleeve clamp means for releasably coupling said adaptor sleeve intermediate the ends thereof to the spindle housing, said sleeve clamp means being positioned between said adaptor sleeve and the spindle housing sleeve when said adaptor assembly is mounted on a machine tool;
• coupling means for selectively rigidly coupling the second end of said adaptor sleeve to the spindle housing, said coupling means permitting variation of the rotational position of said adaptor sleeve relative to the spindle housing when both of said sleeve clamp means and coupling means are in the unactuated state;
• and
• actuator means for causing engagement and disengagement of said coupling means.