| 摘要 |
The advancing means comprises a pair of frames which each exhibit a tread plate for a foot, and each of these frames can be displaced by means of direction-independent rolling elements, the tread plate, on loading, being lowered counter to a spring force, and a braking device preventing the displacement of the frame.
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| 申请人 |
PIETSCHMANN, HELMUT, DIPL.-ING. (FH), 7516 KARLSBAD, DE |
发明人 |
PIETSCHMANN, HELMUT, DIPL.-ING. (FH), 7516 KARLSBAD, DE |
