| 摘要 |
One of the improvements consists of the crosspieces 2 lacking holes and being mounted on pieces 3 with wheels which facilitate sliding on the corresponding bed, said crosspieces 2 having a transverse profiling determining prismatic guides 22. Another of the improvements consists in the fact that the piece which constitutes the over- base 6 for mounting the support 10 for the column 12 is located directly on the recess of the base piece 4 mounted directly on the crosspieces 2, this over-base 6 being retained and guided by means of the lateral plates 7 which can be fixed by means of screws 8 to the base piece 4. <IMAGE>
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