ZENTRIFUGALSPINDEL.

摘要

PCT No. PCT/GB91/00302 Sec. 371 Date Oct. 18, 1991 Sec. 102(e) Date Oct. 18, 1991 PCT Filed Feb. 27, 1991 PCT Pub. No. WO91/13716 PCT Pub. Date Sep. 19, 1991.A centrifugal spindle is described comprising a hollow shaft (1) having a collet (2) at one end for gripping a tool shank (12) and a centrifugal loading means (3) housed within the shaft (1). The loading means comprises two coaxial pistons (4,5) spaced from each other and linked by flexible connecting members (6) and intermediate bob weights (7). One piston (4) is secured axially to the hollow shaft (1) while the other piston is secured to the collet so that rotation of the shaft (1) causes the weights (7) to move radially outwards under centrifugal force to draw the piston (5) and collet (2) into the hollow shaft (1) gripping the tool shank (12). The collet may have spring loaded jaws forcing them into the closed position.