PURPOSE: To facilitate cable wiring by placing piping ducts in the shape of a grid, providing connection piping ducts to four directional piping ducts at right angles, fitting and loading about reverse U shaped joints to link and, at the same time, spreading floorings all over the surface of a floor.
CONSTITUTION: The standard inking of piping ducts is made on the underfloor ground wiring cables, and long and short linear piping duct bodies 2 and a cross piping duct body 12 are placed along the line. After that, four linear piping duct bodies 2 are fitted and coupled with four joints 3 from the above to form cross-shaped piping ducts 1 and 1. Then, floorings 30 are spread around the piping duct bodies 2 and cross piping duct body 12, covers 4 and 14 are respectively put on the piping duct bodies 2 and 12, and covers are also put on the floorings. According to the constitution, the piping duct having a raceway can be formed in the shaped of a grid, and the size thereof can be easily and freely made.
NAKAMURA YAKUHARU
HIRANO TAKESHI
NAGASE KIYOSHI
MIYAMOTO EIJI
