| 摘要 |
The present invention relates to a tube guide for a column unit, and more particularly to a tube guide for a column unit which can smoothly move a spindle upward and downward by forming a plurality of ribs on the inside surface of the tube guide which guides a spindle which has a multilateral cross-section and which can smoothly accomplish the broaching. The tube guide has a hexagonal inside surface. Two inside ribs are formed on each surface along the axial direction. Since the upward and downward movements of the spindle reduce the contacting area, the frictional force is remarkably reduced and the spindle is smoothly moved upward and downward. Further, only one surface of the inside rib needs to be broached, the broaching area is remarkably reduced.
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