Abrasive tool for collecting dust

Abstract

An abrasive tool for collecting dust, comprising: an abrasive material in sheet form having not less than 20 dust collecting holes; and a backup pad, including: a base material having a first major surface, a second major surface opposite to the first major surface, and at least one hole for collecting dust penetrating through the first major surface and the second major surface; and a ventilative member connected to the first major surface of the base material, having an attaching surface to which the abrasive material is attached, and a plurality of holes extending from the attaching surface towards the first major surface of the base material; the ventilative member working jointly with the base material and making dust flow out from the attaching surface to the second major surface of the base material.

1 . An abrasive tool for collecting dust, comprising:
 an abrasive material in sheet form having not less than 20 dust collecting holes; and   a backup pad, including: a base material having a first major surface, a second major surface opposite to the first major surface, and at least one hole for collecting dust penetrating through the first major surface and the second major surface; and a ventilative member connected to the first major surface of the base material, having an attaching surface to which the abrasive material is attached, and a plurality of holes extending from the attaching surface towards the first major surface of the base material; the ventilative member working jointly with the base material and making dust flow out from the attaching surface to the second major surface of the base material.   
   
   
       2 . The abrasive tool for collecting dust according to  claim 1 , wherein said abrasive material in sheet form and said backup pad are formed in such a manner that
 when said abrasive material in sheet form is attached to said surface for attaching an abrasive material of said backup pad, the number of dust collecting holes which have effective openings, where dust collecting holes in the two overlap, is not less than 30% of the total number of dust collecting holes in said abrasive material in sheet form.   
   
   
       3 . The abrasive tool for collecting dust according to  claim 1 , wherein said abrasive material in sheet form has an area of openings of said dust collecting holes of not less than 1% in the abrasive surface. 
   
   
       4 . The abrasive tool for collecting dust according to  claim 1 , wherein said abrasive material in sheet form is attached to said surface for attaching an abrasive material of said backup pad by means of a surface fastener. 
   
   
       5 . The abrasive tool for collecting dust according to  claim 1 , wherein the ventilative member has a plurality of discrete vents defined with a plurality of ventilative walls. 
   
   
       6 . The abrasive tool for collecting dust according to  claim 1 , wherein the ventilative member has a total open area on the attaching surface of not less than 15% based on the whole abrasive material contacting area. 
   
   
       7 . The abrasive tool for collecting dust according to  claim 1 , wherein the backup pad has a cavity pocket between the ventilative member and the base material. 
   
   
       8 . The abrasive tool for collecting dust according to  claim 1 , wherein the ventilative member has at least 15 discrete vents. 
   
   
       9 . The abrasive tool for collecting dust according to  claim 1 , wherein said abrasive material has a first abrasive surface region having said open structure and a second abrasive surface region having no hole structure on the abrasive surface.