| 摘要 |
A support leg (1) comprises a pivotable upper part (2) and a lower part (3) that is protrudable relative to the former, said lower part having a support foot (4). On the upper leg part (2) is arranged a rod (14) being displaceable movable which at one end is connected with a flexible tractive means (11), e.g. a chain, and at the opposite end is actuatable by the support foot (4). The tractive means (11) is laid over a pulley means (20) that separates inner and outer parts (11', 11'') of the tractive means. When pushing in the lower leg part (3), the rod is carried with the same, while lengthening the inner chain part (11') at the same time as the outer part (11'') is shortened, as the support leg pivots in the direction of a raised position. When pushing out the lower leg part, the rod (14) is allowed to move in the opposite direction, while shortening the inner chain part (11') and simultaneously lengthening the outer part (11''). In this way, a pivoting of the support leg in the direction of a lowered position is made possible. |
