| 摘要 |
<p>A double gear train (4,5), driven by an electric motor (11), is secured via a housing (10) to the middle profile tube (8). One worm gear (4) forms inside a threaded nut. The threaded spindle (1), non-rotary couple to outer profile tube (7), provides displacement work between the outer and middle profile tubes on the motor rotation. A second spindle (2), non-rotary fitted in second work gear (5), provides displacement work, via spindle nut (6) firmly coupled to inner profile tube (9), between outer and inner tube, on motor rotation. Drive is taken of worm gear shaft (12).</p> |
