| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the breakage of a large-diameter ball and reduce noises by storing the rotatable steel large-diameter main ball in the semispherical recess of a ball receiving member, and inserting many rotatable resin small- diameter sub-balls between the large-diameter ball and the recess. SOLUTION: This device 17 is provided with a ball receiving member 3, a large-diameter main ball 7, and small-diameter sub-balls 19. Since the small- diameter balls 19 are made of a resin such as nylon or vinyl chloride, the noises by the collision between the large-diameter ball 7 and the small-diameter balls 19 and the noises by the collision between the small-diameter balls 19 can be reduced when a work is rolled on many devices 17, and the work environment can be improved. Since the large-diameter ball 7 is made of steel, it is not broken even if the end section of the work collides with the large-diameter ball 7 when the work is rolled.</p> |
