| 摘要 |
PROBLEM TO BE SOLVED: To prevent a person from being injured due to contact of his/her body with an inner frame by preventing the inner frame from protruding below a ceiling inspection hole when the inner frame is opened, and eliminate a risk of inflicting an injury on the person below the ceiling inspection hole due to the contact of his/her body with the inner frame by preventing the inner frame from falling. SOLUTION: The ceiling inspection hole is composed of an outer frame 1, the inner frame 4 which is provided in such a manner that a cover material 2b is placed on a plate part at an inside lower end so as to open/close an inner space of the outer frame 1, paired guiding rail members 10 which are mounted on respective rising walls 9 at a pair of opposed side edges of the outer frame 1 in such a manner as to be inclined at a slight angle from the outer frame 1 along a lengthwise direction of the rising wall 9, and two rollers 12a and 12b which are provided at upper ends of respective rising walls 11 at a pair of opposed side edges of the inner frame 4 in such a manner as to overhang outside and be guided by the rail members 10. Constitutionally, the inner frame 4 is slid diagonally upward in a state in which one end side of the inner frame 4 is lifted up, in order to open the inner space of the outer frame 1.
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