| 摘要 |
PROBLEM TO BE SOLVED: To provide a grating which makes a side end of a main bar and a side bar joined together by caulking, and while reducing production costs. SOLUTION: A joining protrusive edge 5 with a length falling within the range of the thickness of the side bar 3 is protrusively formed at the side end of the main bar 2 after expansive deformation working. Joining openings 6, which comprise an fit-in opening 7 undergoing the fitting of the joining protrusive edge 5 of the main bar 2 and a dent portion 8 continuously formed at the opening edge of the fit-in opening 7 and opened on the outside surface of the side bar 3, are formed at predetermined spacings in the longitudinal direction of the side bar 3, on the rectangular cross-section tie plate-like side bar 3. The end of the joining protrusive edge 5 is pressurized by a pressure member 9 in the state of fitting the joining protrusive edge 5 into each fit-in opening 7; and the main bar 2 and the side bar 3 are joined together by means of an expansively deformed portion 11 which is expansively deformed with a width equal to/greater than the width of the fit-in opening 7 in the dent portion 8 of the joining opening 6. COPYRIGHT: (C)2011,JPO&INPIT
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