| 摘要 |
A bearing for supporting a telescoping helical spiral tube device against lateral movement comprises a plurality of rollers adapted to engage the outer periphery of the tube. The rollers are interconnected with brake means main become operative to prevent radial movement of any roller except when all of the rollers are equally displaced from the axis of the tube. Thus, the bearing allows expansion and contraction of the tube as it is extended and withdrawn, but positively prevents lateral displacement of the tube.
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