| 摘要 |
PROBLEM TO BE SOLVED: To highly secure the face strength and anti-horizontal load of a lattice fence facilitating the grating of an extruded hollow material of the fence. SOLUTION: The extruded hollow materials 1 are intersected and arranged inside and outside to be mutually notched and joined at each intersection position, respectively, so as to secure the face strength and the anti-horizontal load. When mutually notched parts 2 are formed, a cut and raised projection 4 inclined loosely by cutting and raising processing is formed on a one-sided cut and the left wall 3 of one inside and outside extruded hollow material 1. When they are notched and connected, the notched part 2 of the other extruded hollow material 1 is locked to get over it and let it pass so as to be hooked, and both the extruded hollow materials 1 are automatically joined to simply manufacture the fence. COPYRIGHT: (C)2004,JPO
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