| 摘要 |
PROBLEM TO BE SOLVED: To facilitate opening/closing of an inner cover while preventing the deformation and rattling of frame members of an outer frame and the inner cover, and to reduce constitutive members and assembling man-hours to facilitate assembly. SOLUTION: This floor inspection port comprises the outer frame 10 provided with outer frame members 11 framed in quadrilateral shape, and mounted to a floor opening, and the inner cover 30 provided with inner frame members 21 framed in quadrilateral shape, and detachably fitted into the outer frame 10. The outer frame 10 and the inner cover 30 are provided with an outer frame corner block 40 or an inner frame corner block 50 integrally formed with a fixed wall piece 41 (51) of approximately L-shape from the top view fixed by a fixing screw 80 while framing the adjacent frame members orthogonally to each other, and a horizontal piece 42 (52) horizontally extended from the fixed wall piece 41 (51). A fastening screw 60 inserted through a through hole provided in the horizontal piece 52 of the inner frame corner block 50 is formed to be screwable with an internal thread part 43 provided in the horizontal piece 42 of the outer frame corner block 40. COPYRIGHT: (C)2004,JPO&NCIPI
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