| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for improving a reinforcing core used for a table-like member. SOLUTION: A plate-like member is formed of two circular arcs different in the length and two straight lines connecting both ends of the circular arcs. The plate-like member is composed of a projection piece unit forming an opening pair of a plurality of upper parts. The projection piece unit is formed so as to extend to the two circular arcs, and a boundary part of the projection piece unit has flexibility. The reinforcing core constitutes a frusto-conical or a polygonal frusto-conical shape by wedging the two sides other than the circular arcs of the plate-like member. COPYRIGHT: (C)2007,JPO&INPIT
|
