Corner formative member, and apparatus for chamfering apex angle portion of corner formative member

Abstract

A corner formative member A includes at least two plate pieces 1 a and 1 a bonded with each other at side portions thereof via reactive hot melt adhesive P so as to form an apex angle portion 3 extending in a longitudinal direction. A chamfered portion 8 with a narrow width is formed on the apex angle portion 3. The chamfered portion 8 is formed into a longitudinally extended non-horizontal irregularly arranged continuous concavo-convex surface. An adhesive layer P remains at a joint portion of the apex angle portion 3 and an end face of the adhesive layer P at the chamfered portion side is a flat surface along the concavo-convex surface of the chamfered portion 8. An apparatus B for chamfering the apex angle portion 3 of the corner formative member A includes a corner formative member supporting means 20 for supporting the corner formative member A, a rotation cutting tool 30 disposed so as to intersect with the apex angle portion 3, a rotation cutting tool supporting means 20 for supporting the rotation cutting tool 30 in a vertically movable manner along a concavo-convex surface formed at the apex angle portion 3, a transporting means 21 for giving a relative movement between the rotation cutting tool 30 and the corner formative member A, and a cooling means 50 for cooling a region where the apex angle portion 3 is cut with the rotation cutting tool 30.

1 . A corner formative member, comprising: 
 at least two plate pieces bonded with each other at side portions thereof via reactive hot melt adhesive so as to form an apex angle portion extending in a longitudinal direction,    wherein a chamfered portion with a narrow width is formed on the apex angle portion,    wherein the chamfered portion is formed into a longitudinally extended non-horizontal irregularly arranged continuous concavo-convex surface, and    wherein an adhesive layer remains at a joint portion of the apex angle portion and an end face of the adhesive layer at the chamfered side portion is a flat surface along the concavo-convex surface of the chamfered portion.    
   
   
       2 . The corner formative member as recited in  claim 1 , wherein the plate piece has an embossed pattern as a surface pattern extending in a direction intersecting with a joint face of the plate piece.  
   
   
       3 . The corner formative member as recited in  claim 1 , wherein the concavo-convex surface of the narrow chamfered portion formed on the apex angle portion includes a continuous curved portion.  
   
   
       4 . The corner formative member as recited in  claim 1 , wherein a width of the adhesive layer remained at the apex angle portion falls within the range of about 0.3 mm to about 0.5 mm.  
   
   
       5 . The corner formative member as recited in  claim 1 , a width of the narrow chamfered portion formed on the apex angle portion is 8 mm or less.  
   
   
       6 . The corner formative member as recited in  claim 1 , wherein post-painting is applied to the chamfered portion.  
   
   
       7 . An apparatus for chamfering an apex angle portion of a corner formative member, comprising: 
 a corner formative member supporting means configured to support the corner formative member formed by bonding at least two plate pieces via reactive hot melt adhesive so as to form an apex angle portion extending in a longitudinal direction;    a rotation cutting tool disposed so as to intersect with the apex angle portion of the supported corner formative member;    a rotation cutting tool supporting means configured to support the rotation cutting tool in a vertically movable manner along a concavo-convex surface formed at the apex angle portion;    a transporting means configured to give a relative movement between the rotation cutting tool and the corner formative member; and    a cooling means configured to cool a region where the apex angle portion of the corner formative member is cut with the rotation cutting tool.    
   
   
       8 . The apparatus as recited in  claim 7 , further comprising a second cooling means provided at an upstream side of a region where the apex angle portion of the corner formative member is cut with the rotation cutting tool, the second cooling means being configured to cool at least the region where the apex angle portion of the corner formative member is to be cut with the rotation cutting tool.  
   
   
       9 . The apparatus as recited in  claim 8 , further comprising a third cooling means provided at a downstream side of a region where the apex angle portion of the corner formative member was cut with the rotation cutting tool, the third cooling means being configured to cool at least the region where the apex angle portion of the corner formative member was cut with the rotation cutting tool.  
   
   
       10 . The apparatus as recited in  claim 7 , wherein two or more rotation cutting tools are arranged in a longitudinal direction of the corner formative member to be cut.  
   
   
       11 . The apparatus as recited in  claim 7 , wherein the cooling means is for blowing air or pre-cooled air to the cooling region.  
   
   
       12 . The apparatus as recited in  claim 7 , wherein the rotation cutting tool is a grinder bit driven by compressed air.  
   
   
       13 . The corner formative member as recited in  claim 2 , wherein the concavo-convex surface of the narrow chamfered portion formed on the apex angle portion includes a continuous curved portion.  
   
   
       14 . The corner formative member as recited in  claim 2 , wherein a width of the adhesive layer remained at the apex angle portion falls within the range of about 0.3 mm to about 0.5 mm.  
   
   
       15 . The corner formative member as recited in  claim 3 , wherein a width of the adhesive layer remained at the apex angle portion falls within the range of about 0.3 mm to about 0.5 mm.  
   
   
       16 . The corner formative member as recited in  claim 2 , a width of the narrow chamfered portion formed on the apex angle portion is 8 mm or less.  
   
   
       17 . The corner formative member as recited  claim 3 , a width of the narrow chamfered portion formed on the apex angle portion is 8 mm or less.  
   
   
       18 . The corner formative member as recited in  claim 4 , a width of the narrow chamfered portion formed on the apex angle portion is 8 mm or less.  
   
   
       19 . The apparatus as recited in  claim 8 , wherein two or more rotation cutting tools are arranged in a longitudinal direction of the corner formative member to be cut.  
   
   
       20 . The apparatus as recited in  claim 9 , wherein two or more rotation cutting tools are arranged in a longitudinal direction of the corner formative member to be cut.