Ventilating insert for abrasive tools

Abstract

A ventilating insert for the substantially coaxial fixing of abrasive tools, such as deburring wheels, cutting wheels, fiber discs, Scotch-Brite® having an abrasive disk-like element, to the free end of a rotating shaft of a grinder, comprising at least one threaded ring for coupling to the free end of the rotating shaft, an annular portion of which is jointly associated with the disk-shaped element, the threaded ring comprising a central threaded hole and being designed to be arranged substantially coaxially with the disk-shaped element and able to be associated with corresponding threaded elements provided on the free end of the rotating shaft. The ventilating insert comprises deflectors for at least one fluid for cooling the disk-like element which are associated with the threaded ring for propelling radially the cooling fluid from the central to the peripheral region of the disk-like element during the rotation thereof.

1 . A ventilating insert for substantially coaxial fixing of abrasive tools, such as deburring wheels, cutting wheels, fiber discs, Scotch-Brite® discs or tools, having an abrasive disk-shaped element, to a free end of a rotating shaft of a grinder, comprising:
 at least one threaded ring that comprises a central threaded hole for coupling with corresponding threaded means provided on a free end of a rotating shaft, said threaded ring having an annular portion which is jointly associatable with the disk-shaped element, arranged substantially coaxially thereto; 
 and deflecting means for deflecting at least one fluid for cooling the disk-shaped element which are associated with said threaded ring for propelling radially the cooling fluid from a central region to a peripheral region of the disk-shaped element during rotation thereof. 
 
     
     
         2 . The insert of  claim 1 , wherein said deflecting means comprise a plurality of vanes that protrude substantially radially and diverge with respect to each other, at least one first end of said vanes being jointly associated with said threaded ring. 
     
     
         3 . The insert of  claim 2 , wherein each one of said vanes comprises a substantially rectilinear longitudinal extension which protrudes radially with respect to said threaded ring. 
     
     
         4 . The insert of  claim 2 , wherein each one of said vanes comprises a substantially C-shaped curved longitudinal extension which forms a deflector of the flow of said cooling fluid. 
     
     
         5 . The insert of  claim 2 , wherein said threaded ring comprises a substantially cup-shaped portion, which surrounds said central threaded hole and is arranged opposite said annular portion, said vanes being formed at said substantially cup-shaped portion. 
     
     
         6 . The insert of  claim 2 , wherein a second end of each one of said vanes is provided so that it substantially cantilevers out with respect to said threaded ring. 
     
     
         7 . The insert of  claim 6 , wherein at least one annular flange which is substantially continuous and coaxial with said threaded ring, for connecting said vanes, whose outside radius is substantially equal to a distance between the second ends of said vanes and a rotation axis of said threaded ring, and whose inside diameter is substantially larger than said central threaded hole, said annular flange being jointly associated with said second ends of said vanes. 
     
     
         8 . The insert of  claim 7 , wherein a connecting surface between each pair of contiguous ones of said vanes, provided in said threaded ring, has a substantially frustum-shaped generatrix in a proximal region, with a longitudinal axis that is substantially inclined with respect to the rotation axis of said threaded ring. 
     
     
         9 . The insert of  claim 1 , in combination with an abrasive tool having an abrasive disk-shaped element, wherein the disk-shaped element comprises through openings provided at a substantially central portion thereof for outflow of the cooling fluid at a back part of the disk-like element.