| 摘要 |
Vertically movable bar (1) with row of holes (14) for height adjustment located alongside is permanently joined to bearing sleeve (11) with its lower end. Pivot (10) surrounded by helical spring (9) at its top is movable positioned inside case (12) accommodated inside bearing sleeve (11), serving as locking element with surrounding groove (8) at its upper end. When footrest (2) is lifted at handle (13) and swung into vertical, back to horizontal position respectively, locking pin (7) is either pulled from groove (8) or returned by forces of spring (9). |
