| 摘要 |
PROBLEM TO BE SOLVED: To prevent a bolt from falling into an apparatus when the fixation bolt is mounted and prevent a head of the bolt from protruding from the surface of a soundproof case after an air-exhaust port cover is mounted.SOLUTION: Four corners of a quadrangular air-exhaust port are stepped to become lower than an upper surface of a soundproof case 1, so as to form cover reception portions 9. Rectangular openings 7 each having a sufficient width through which a head of a bolt 8 can pass are arranged in a grid in an air-exhaust port cover 3. A mounting piece 13 with an L-shape cross section, which comprises a horizontal plate 13a having a bolt hole 14 and an erected plate 13b erected at a right angle, is mounted to a lower surface portion corresponding to the cover reception portion 9 of the air-exhaust port 2, so that an upper edge of the erected plate 13b crosses the opening 7 at each of the four corner of the air-exhaust port cover 3. The air-exhaust port cover 3 is placed on the cover reception portions 9 to cover the air-exhaust port 2. A bolt 8 is made to pass through the bolt hole 14 located within each of the openings 7 and an insertion hole 10 of each of the cover reception portions 9 and is screwed to a nut 11. |
