| 摘要 |
PURPOSE:To make the widening of a floor panel easily performable, by dividing the floor panel symmetrically, while laying a relay plate and a chassis frame across this divided part and thereby widening the floor panel. CONSTITUTION:A floor panel 11 is divided symmetrically, and a relay plate 16 is laid over an interspace between respective edges 11a and 11b. In addition, flange parts 12b and 12c of a chassis frame 12 are locked to these edges 11a and 11b by means of welding. Since the floor panel is widened as the abovementioned, the windening quantity is optionally selectable.
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