| 摘要 |
<p>The device has at least two frame parts (1,2) adjustable relative to each other with joints (3,4) and able to be locked. Each frame part consists of upper and lower transverse rods (9-12) between which further grid rods (7,8) are arranged and a joint part on the end of each transverse rod for connection to a joint part of the adjacent rod.. Each joint part consists of an annular connecting element with inner teeth, whereby the connecting elements are arranged one above the other. A joint has a locking element with an outer locking gear rim.</p> |
