| 摘要 |
PROBLEM TO BE SOLVED: To provide a rack that allows its arm member to be folded only at a prescribed position. SOLUTION: This rack has an arm member (a) adapted to pivot on one end according to the movement of a moving member 17, and a support (p) divided into an immovable support part 24 and a movable support part 28 rotatable with respect to the immovable support part 24. The movable support part 28 is mounted with a screw shaft 13, and the immovable support part 24 is provided with a mounting member 37 to which an input gear 15 is fixed. Relative rotation of the movable support part 28 to the immovable support part 24 places the input gear 15 and an output gear 14 into engagement or disengagement according to the rotation direction.
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