Lifting device for raising and lowering load has outer, rotatably located tube with at least three guide and support components distributed on periphery of inside of outer tube and displaced height wise in relation to one another

摘要

A load can be raised and lowered by a lifting device with an outer, rotatably located tube, (10) on the periphery of the inside of which at least three guide and support components (70,74) are distributed and displaced height wise in relation to one another. At least one inner tube (12) is inserted coaxially to the outer tube and has a guide groove (80) running screw-form on the outside with several tracks with a predetermined pitch. The guide and support components of the outer tube engage in the guide groove of the inner tube. The inner tubes (12,14,16,18,19) can be moved in and out of each other telescopically.