| 摘要 |
<p>PROBLEM TO BE SOLVED: To simply cross over a level difference Fa by a wheelchair C. SOLUTION: A right and a left tread 11, 11 and a hinge 21 connecting the treads 11, 11 mutually so as to fold them are provided. The treads 11, 11 are opened in a plane and are stretched over upper and lower road faces F, F in the level difference Fa to form oblique running faces A, A allowing the wheelchair C to run.</p> |
