| 摘要 |
The ball according to the invention, which is hollow and spherical, has a hollow structure equipped on the outside and radially with a series of suction pads 2, 3, 4, 5, two of which are located in diametrically opposed positions while the rest of the suction pads are placed in two rows in the form of a ring which are offset with respect to one another so that each suction pad 2, 3 of a row is located between two suction pads 4, 5 of the other row, this structure being equipped, moreover, with a series of triangular orifices 6 grouped into two lines in the form of rings, each orifice being arranged between two suction pads in a single row and the suction pad nearest to two diametrically opposed suction pads. <IMAGE>
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