摘要 |
<p>A setting unit has two spaced-apart sections (10,20) each made up of two movable portions (11,12,22). Each movable portion is provided with a supporting element (16-18,26-28) at one end, while an outrigger element (14) is provided to another movable portion. The outrigger element is height adjustable and movably accommodated in a sleeve (13,23) fixed to the movable portion.</p> |