WEDGE MECHANISM OF A HYDRAULIC EXPANDING MANDREL

When piston 1 is moved to the right by the action of fluid delivered to the left end of the cylinder, draw rod 2, by means of tapered members 4 and 5, expands slotted spring sleeve 6 to locate and clamp thin-walled workpiece 3 on its previously machined bore. Sleeve 6 is of the spring collet type wit alternating slits cut from the two ends to enable it to be expanded.
$3877$LHP,GC$