| 摘要 |
PCT No. PCT/SE80/00010 Sec. 371 Date Sep. 11, 1980 Sec. 102(e) Date Sep. 11, 1980 PCT Filed Jan. 10, 1980 PCT Pub. No. WO80/01476 PCT Pub. Date Jul. 24, 1980.In the wall of a supporting leg, which is formed as a tube at least in its downwardly open lower portion, a hole (11) has been formed. A sloping plate (10) inside the leg forces dirt, snow, etc. through this hole after penetrating into said lower portion of the leg and counteracts the weakening of the strength caused by the hole. A support plate (4) displaceable along the leg is lockable by a locking means (6) in a position wherein the plate is at a distance from a lower end of the leg resting on a substantially horizontal surface or to a position wherein the plate is lower than or substantially in the same horizontal plane as the lower end of the leg and there is resting on the substantially horizontal surface. The lower edges of the leg suitably are provided with means (3) for increasing the grip with the ground.
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