| 摘要 |
PROBLEM TO BE SOLVED: To easily connect a lid body 2a and a connecting board 8a. SOLUTION: Compression coil springs 25, 25 are allowed to be fitted in cylinder holes 24a, 24a for mounting the compression coil springs in a compressed state, and for this, step parts 38, 38 for preventing the extension of the compression coil springs 25, 25 are formed in the middle of the cylinder holes 24a, 24a. Therefore, the drop of the compression coil spring 25 and a pressing pin 29 from the cylinder hole 24a of the connecting board 8a on the upper side in the vertical direction is prevented during the connection work of the lid body 2a and the connecting board 8a, so that the connection work can be easily carried out.
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