| 摘要 |
PROBLEM TO BE SOLVED: To make an outer frame mounted easily and firmly in an opening, provided in a floor part, irrespective of a position of a floor joist and a thickness of the floor part. SOLUTION: A floor inspection hole is composed of an inner frame 40, which is fitted detachably into the outer frame 10 mounted in the opening 2 provided in the floor part F, and an opening and closing cover body 50 whose peripheral edge is fitted with the inner frame 40. The outer frame 10 is formed with upper and lower flanges 12 and 13. A through hole 15 is pierced in the lower flange 13. A fixing bracket 30 is formed in a mounting screw 90 passing through the through hole 15 in such a manner as to enable screw connection, and provided with a fixing part 35 which is brought into pressure contact with an under surface of the floor part F. A protrusion 37 is formed in the fixing part 35. The screw connection of the mounting screw 90 to the fixing bracket 30 not only makes the floor part F held in such a manner as to be sandwiched between the upper flange 12 of the outer frame 10 and the fixing part 35 of the fixing bracket 30 but also makes the protrusion 37 engaged for fixation in the under surface of the floor F.
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