Patent ID: 8104243
Filing Date: 2012-01-31
Classification: B05C,B24B,E04F

Abstract:
1. A projected corner column which is formed by bonding at least two board pieces in such a way that one of the edges of one board piece is bonded to that of the other board piece to form an apex corner, the at least two board pieces having embossed patterns different from each other in the vicinity of the apex corner and/or embossed patterns where convex regions of the embossed patterns are different at least between adjacent convex regions, characterized in that a chamfered part with a narrow width is formed on the apex corner, and said chamfered part has a concavo-convex surface having irregular convexoconcave rather than a flat surface characterized in that grooves extending in a direction perpendicular to the apex corner are formed on the surface of the board piece, and the contact surface between concave part corresponding to said groove and the chamfered part formed on the apex corner is a curved surface.