| 摘要 |
Locking pieces (14) are used for the lockable retention of a transverse element (2) on a standard tube (1), which for this purpose reaches with catch hooks (21) through catch openings (131) into the interior space (10) of the standard tube (1). These locking pieces are designed as tubular pieces and are arranged displaceably in the interior space (10) of the standard tube with little clearance and are coupled, via connecting rods (15, 15.1) to a lock (17) likewise mounted in the standard tube. <IMAGE>
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