| 摘要 |
PCT No. PCT/SE83/00053 Sec. 371 Date Sep. 28, 1983 Sec. 102(e) Date Sep. 28, 1983 PCT Filed Feb. 18, 1983 PCT Pub. No. WO83/02977 PCT Pub. Date Sep. 1, 1983.A bracket is adapted for mounting on a ladder (1) as the support means for a work platform as one or more planks. The bracket comprises an arm (2) as a seat for the platform, a carrying bar (3) adapted for being suspended in one of the rungs (4) of the ladder and engaging against a rung situated lower down, and a strut (5) arranged between the carrying bar and arm to support the latter substantially horizontally oriented. The strut has a hook means (6) for optional coaction with one of a row of notches (7) along the carrying bar. The arm is joined to the carrying bar at a first joint (9) and to the strut at a second joint (11). The second joint is movable and comprises two or more non-round and preferably like holes (14) along the arm coacting with a headed stud on the strut. The stud and its head are non-rotatably fixed to the strut, and formed to allow insertion of the head through the hole in only one, or some, previously determined swinging positions of the free strut, for locking the strut pivotably to the arm by swinging the strut into engagement with the carrying bar. The first joint is permanent. The mutually opposing faces of the arm and supporting bar are formed such as to allow swinging the arm and bar about the first joint and into mutually essentially parallel orientation of their longitudinal axes after the strut has been removed. |
