| 摘要 |
PURPOSE:To simplify the structure by providing a reversing groove for a cover integral with guides, the inside diameter surface of which have the same radius of curvature as the reversing groove extending over the whole length of both sides, and setting the distance between the open ends of the guides smaller than the diameter of a ball to form a ball reversing device. CONSTITUTION:Rolling grooves 13 are longitudinally formed on the upper surface and both end surfaces of track rails 12. A bearing body 14 U-shaped in section and laid on the track rails 12 is provided with a rolling groove 15 formed corresponding to the rolling groove 13, and a return hole 16 is formed parallel to the rolling groove 15. The front and rear end surfaces of the bearing body 14 are covered with covers 17, and the collision surfaces thereof with the bearing body 14 are provided with concave portions 18. In this arrangement, guides 20 projected into the concave portions 18 are formed extending over the total length of both sides of a reversing groove 19 on the concave portion 18 base, thereby to form a ball receiving path 21 for connecting between the rolling groove 15 and the return hole 16. The distance between the open ends of the guides 20 is set smaller than the diameter of a ball 22. |
