摘要 |
<p>The device has a solid structure (7) formed as tulip shape and comprising bent metal arches (6) terminated by a curve widened toward outside the device to allow insertion of a ball by simple pressure and leave the ball by a push. The metal arches are fixed at a base (5) on a lower face in which a hollow tube (4) is fixed. Two notches receive a pin (3). A fixation plate (1) retains the solid structure on a ceiling or a floor, where the fixation plate is made of metal, wood and plastic.</p> |