| 摘要 |
PROBLEM TO BE SOLVED: To allow easy attachment/detachment of a grating for maintenance while solving cost and workability problems that a conventional grating is fixed to a U-shaped groove in the state of inaccurately positioning a fixing bolt for the manufactured grating and a nut is buried in the U-shaped groove while taking measures for largely opening a grating fixing bolt hole and for cutting the end of one vertical strip plate and welding vertical strip plates on both sides to a partition plate to apply for the fixing bolt hole but the bolt hole should be additionally machined at totally four places, both ends and each of right and left sides, per one grating, resulting in an increase in prime cost. SOLUTION: The nut for the U-shaped groove is installed to be movable in an X-direction and the grating fixing bolt hole is opened to be oblong and round in a Y-direction. The difficulty of workability due to a narrow space between the vertical strip plates for the grating is solved by using a working tool according to this invention. COPYRIGHT: (C)2007,JPO&INPIT
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