Patent ID: 7344435
Filing Date: 2008-03-18
Classification: B24B,B27B,Y10T

Abstract:
1. A hand-held power tool comprising: a work spindle for driving a tool, said work spindle having a tool end comprising a holding portion; a fastener for fastening said tool to said work spindle against said holding portion, said fastener including a clamping shaft being insertable into said work spindle; a displacement assembly comprising a thrust member configured for sliding said fastener between a released position in which said fastener can be detached from said work spindle and a clamped position in which said fastener is clamped against said holding portion by a claming force; and a lock assembly received inside said work spindle between said thrust member and said fastener for locking said clamping shaft against retraction in said clamped position and for releasing said clamping shaft allowing retraction from said work spindle in said released position; wherein said lock assembly comprises a collar and a plurality of clamping members held by said collar radially displaceably against said clamping shaft and axially displaceably within said work spindle; wherein said clamping members comprise first inclined surfaces, said first inclined surfaces engaging second inclined surfaces provided on said collar upon movement of said collar against said first inclined surfaces, thereby impinging said clamping members towards said clamping shaft for engaging said clamping shaft in said clamped position.