| 摘要 |
A pair of thin flexible bands are arranged in a loop with one band being on the inside of the loop and the other band being on the outside of the loop. The inner band is resiliently flexed in a lobe arching away from the outer band, and the bands are secured together adjacent the ends of the loop. The bending moments in the inner band normally urge the lobe to progress toward one end of the loop. By changing the curvature of the loop, the bending moments in the inner band are changed and the lobe snaps over to the opposite side of the loop.
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