| 摘要 |
A two-stage slide unit which can increase the stroke of a moving side member for a fixed side member while planning compaction, and can be produced easily at a low cost. The two-stage slide unit comprises a fixed side rail (1), an intermediate supporting member (3) attached movably for the fixed side rail (1) through a large number of balls (4), and a moving side rail (2) attached movably for the intermediate supporting member (3) through a large number of balls (4). The fixed side rail (1) and the moving side rail (2) are formed to have a substantially rectangular cross-section and ball rolling grooves (10, 20) are formed, respectively, in the opposite side faces along the longitudinal direction. A first recess (33) into which the fixed side rail (1) is fitted idly and a second recess (34) into which the moving side rail (2) is fitted idly are formed in the intermediate supporting member (3) in parallel with each other. A track groove (40) for endless circulation of a ball (4) rolling in the ball rolling groove (10, 20) of the fixed side rail (1) or the moving side rail (2) is formed in the inner wall of each recess. |
