| 摘要 |
An angle theta, which is formed by an axis of a horizontal roller rotatably attached to a slider and an axis of an inclined roller, is about 60°, and a load-bearing capacity of the horizontal roller is about a half of that of the inclined roller. Accordingly, the load resistance is substantially constant in four directions, i.e., in upward, downward, rightward, and leftward directions irrespective of attachment posture.
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