| 摘要 |
PROBLEM TO BE SOLVED: To easily and properly fix an inspection cover by applying the constitution that the projection of the inspection cover is slidably engaged with a notch formed on the inspection hole frame of a ceiling. SOLUTION: An inspection hole 1 is made of a square inspection hole 2, a ceiling inspection hole frame 3 and an inspection cover 4. The ceiling inspection hole frame 3 is formed so that front and back frames 3A mounted on the front and back sides 2B of the square inspection hole 2, and right and left frames 3B mounted on right and left sides 2C are housed in such a state as alternately adjacent to one another, and corner pieces 3C are secured to the four corners of the ceiling inspection hole frame 3. Furthermore, the inspection cover 4 is formed out of an outer frame 4A and an inspection cover plate 4B laid therein, and the outer frame 4A is formed out of front and back frames 4A1, and right and left frames 4A2. Also, projections 4A11 for engagement and disengagement from the notches 3A3 of the front and back frames 3A of the ceiling inspection hole frame 3 are provided on the front and back frames 4A1. In addition, the projections 4A11 of the inspection cover 4 are inserted in the notches 3A3 of the ceiling inspection hole frame 3 mounted on the ceiling 2A and caused to slide, thereby mounting the inspection cover 4. |
