To obtain a structure of an inspecting port and of its cover by which a cover is easily fitted, the large inspecting port is arranged as much as possible and the danger of hot water to flow-in is reduced.
The inspecting port 5 is arranged in the bathtub apron of a bathtub with a washing space, a lock piece 12 whose horizontal width is larger than the width of the inspecting port is formed in a width direction in the apron 4a which is positioned in the upper part of the inspecting port 5, an engagement piece 13 to be fitted to the lock piece 12 is formed in the width direction at the inner side of the upper part in the inspecting port cover 6, a fixing piece 7 is formed in the width direction in the lower part of the inspecting port cover 6, a packing material 15 is disposed in the apron in the periphery of the inspecting port and the inspecting port 5 is sealed by the inspecting cover 6, in the upper part of the port by the fitting of the lock piece 12 to the engagement piece 13 and also in the lower part of the port by fixing the fixing piece 7 to the apron 4b in the lower part of the port by fixtures 11a.
SHIRAKAWA SHINYA
MATSUI KAZUTO
HITACHI CHEMICAL CO LTD