Patent ID: 7789737
Filing Date: 2010-09-07
Classification: B24B

Abstract:
1. A rapid locking device for axially clamping a disc-shaped tool or a grinding disc, the device comprising: a driven spindle having an inside wall defining an axial bore, said spindle also having a flange; at least one locking element disposed in said axial bore, said locking element having cup springs; a stud having a domed head and a bolt, wherein the tool is disposed between said head of said stud and said flange, said bolt being inserted into said bore of said spindle; a pretensioning device; a toothed cooperating with said pretensioning device; and a ramp arrangement cooperating with said toothed wheel and said locking element, wherein said pretensioning device causes said cup springs to bulge via said toothed wheel and said ramp arrangement, thereby deceasing an inner diameter of said cup springs to effect secure axial frictional grip between the cup springs and the bolt and frictionally clamp said bolt within said inside wall of said spindle to secure the tool for rotation along with said driven spindle.