| 摘要 |
PROBLEM TO BE SOLVED: To realize easy and inexpensive molding and facilitate assembling of a curve rail resulting in improved working efficiency by dispensing with separate preparation of a metal shaft to reduce the number of parts and by enabling the parts to be easily and inexpensively formed by integrally molding synthetic resin. SOLUTION: A chevron shape movable bottom plate 15 integrally formed of a synthetic resin material is equipped with a pivot part 17 with a spacer function at the folding part and small diameter shafts 18, 19 respectively projected from both end sides of the pivot part 17. One side plate 7 is equipped with, near the mouth edge part upstream from a ball extracting port 20, bearing 23 with which one small diameter shaft 19 of the movable bottom plate 15 is engaged. The bearing 23 is formed by disposing a shaft fitting dent part 24 to receive the small diameter shaft 19 on the inner surface of the side plate and and cutting a U-shape notch 25 on the outer circumference of the bearing 23 to give the bearing 23 an elastic function. The other side plate 9 is equipped with, at a position facing the bearing 23 near the mouth edge part upstream from the ball extracting port 20, shaft hole 26 with which the other small diameter shaft 18 is engaged. COPYRIGHT: (C)2005,JPO&NCIPI
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