| 摘要 |
PROBLEM TO BE SOLVED: To prevent the floating in vertical vibration by rotatably mounting, on a roller bearing, the center part of an engagement member having rolling bodies on the upper and lower end parts, and providing guides for slidingly guiding the rolling bodies of the engagement member on the end surfaces of an upper support plate and a lower support plate. SOLUTION: The center part of a bar-like engagement member 6 is rotatably fixed to the end surface of a roller bearing 3, and rolling bodies 8, 9 are rotatably supported on the upper and lower end parts of the engagement member 6. Further, upper and lower guide grooves 10, 11 for horizontally guiding the rolling bodies 8, 9 supported on the upper and lower ends of the engagement member 6 in the engaged state with sliding according to the rolling of the roller bearing 3 are provided on the end surfaces of the upper and lower support plates 1, 2. Since the engagement member 6 sets the distance between the upper and lower guide grooves 10, 11 to the minimum according to this structure, the upper and lower support plates 1, 2 never vertically separate to each other. Accordingly, even if a vertical vibration is worked, the floating can be prevented.
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