| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost, and to improve the formability by dispensing with the welding of an end part to a side frame part of a bearing bar group in which a particular welding strength and the welding control are required in a grating of a metal lattice with the bearing bars continuously arranged in a square frame. SOLUTION: In this grating 1, a hook piece 6 is projected from an end part of a bearing bar 2, a long hook hole 7 in which this hook piece 6 is inserted and locked is formed by combining a long strip-like inner side plate 8 projected at the 'same pitch as the continuous arrangement pitch P of the bearing bar 2' with a long sheath-like outer cover 9 to store and cover the inner side plate 8 in a hollow part 14, a flange part 13 of the outer cover 9 is inserted in a clearance C of a combination coupling part of the bearing bar 2 group combined through the engagement of the hook hole 7 with the hook piece 6 with the inner side plate 8, and set in a covering manner, and side frame parts 5A, 5B unnecessary for welding are formed through the combination coupling of these three members.
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