| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily cope with the height of a user by controlling to extend the frame end side even when the height is large. SOLUTION: An extending frame 3a is provided in the longer direction of a frame on the end side of the frame 3 supporting a leg bottom 2 so as to be able to control stretching and contracting and an extending bottom 4 is arranged above the extended extending frame 3a. The extending frame 3a can be freely drawn and is extendable from the inside of the frame 3 if necessary. In addition, a footboard 5 is fitted at the apex of the extending frame 3a. The extending bottom 4 is made to such a dimension that can be held by an appropriate supporting means between the frame 3 end part and the foot board 5 from the top.</p> |
