| 摘要 |
PROBLEM TO BE SOLVED: To provide roundness in the suction surface for sucking a suction cup to a round pole. SOLUTION: For rounding a suction surface, two sheets of the suction surfaces of suction cups 1, 2 are superposed in the same direction, for bonding the center part. A pat-shaped sponge 3 is interposed in each half of the suction cup and bonded between the superposed suction surfaces. The upper suction cup 1 retains the sponge, presses the lower suction cup 2, and the suction surface is rounded. In this way, the suction cup is sucked to a circular pole.
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