| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the prevention of ball locking by a pair of opening/closing bodies. SOLUTION: The ball contact end part 3 of a left opening/closing body 1 and the ball contact end part 4 of a right opening/closing body 2 are alternately formed in a front and rear direction. The positions of the ball contact end parts 3, 4 are alternately deviated in the front and rear direction in a direction to be orthogonal to a center line L which passes through the bisecting position of a thickness T in the front and rear direction of the right and left opening/closing bodies 1, 2. In a process where the right and left opening/closing bodies 1, 2 are closed in directions expressed by arrows X22, X23, a ball P is pushed backward as indicated by an arrow X24 even when the ball contact end parts 3, 4 collides in a state where the outer peripheral surface of a diameter is held from both sides on the center line L passing through the center O of the ball P. Thus the ball locking therefore is not caused by the right and left opening/closing bodies 1, 2. COPYRIGHT: (C)2005,JPO&NCIPI
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