| 摘要 |
PROBLEM TO BE SOLVED: To increase the turning angle of a sub step-board member relative to a main step-board member, thereby extending the usable field. SOLUTION: A front and rear frame (15) of the main step-board member (11) has a catch member (25), while a reinforcing frame (21) of the sub step-board member (12) is provided with a hook member (26). The hook member (26) and the catch member (25) are arranged at the positions between both frames (11, 15) without exceeding the height thereof, so that the dimension between both frames (11, 15) is increased and thus the relative turning angle of both frames (11, 15) is increased. COPYRIGHT: (C)2004,JPO
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