| 摘要 |
A sled having left and right runners pivotably attached to front, center and rear cross members. A central longitudinal member is axially pivotably attached to the front and rear cross members. When rotated, the central longitudinal member moves the central cross member right and left, causing the runners to bend and the sled to turn. The front and rear cross members are free to move toward and away from each other to facilitate the smooth deflection of the runners.
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