Patent ID: 8376812
Filing Date: 2013-02-19
Classification: B24B

Abstract:
1. A grinder for refining of a workpiece surface, comprising: a driving shank having a coupling end and an opposed adapter end for operatively connecting with a grinding machine; a grinding shaft having a driving portion coupling with said coupling end of said driving shank and an opposed free end portion arranged to be rotated when said driving portion is driven to rotate by said driving shank; an abrasive arrangement which comprises a plurality of abrading elements spacedly and radially provided at said free end portion of said grinding shaft at an outer circumferential surface thereof such that when said grinding shaft is driven to rotate, said abrading elements are adapted for refining said workpiece surface; and a grinding agent dispenser for guiding a flow of grinding agent, comprising: a guiding channel longitudinally provided within said grinding shaft from said driven portion towards said free end portion; at least a dispensing channel radially extended from said grinding channel at a position adjacent to said abrading elements for evenly dispensing said grinding agent towards said abrading elements by a centrifugal force of said grinding shaft for optimizing an operative condition of said abrading elements during refining said workpiece surface; and a retention sleeve coaxially encircling said grinding shaft and defining a dispensing clearance between said outer circumferential surface of said grinding shaft and an inner circumferential surface of said retention sleeve, such that when said grinding shaft is driven to rotate, said grinding agent is filled in said dispensing clearance to be gradually dispensed at said abrading elements, wherein said retention sleeve further has a plurality of retention slots spacedly formed at a free end thereof to securely engage with said abrading elements at said retention slots so as to retain said abrading elements at said free end of said grinding shaft.