| 摘要 |
PURPOSE:To enable a ball holder and a cap to be accurately positioned to a bracket, by supporting a core to a core mounting recessed part for the ball holder and the cap and engaging an engaging part of the core with the engaging part formed in the bracket. CONSTITUTION:A core 30 adapts its upper end part to the upper end surface of a turning groove 33 while bottom end part to the bottom end surface of a turning groove 34, and the core 30 fixes its position in a vertical direction for a ball holder 17 and a cap 22. While the core, which adapts its cylindrical surface to a core mounting recessed part, fixes the position in a lateral direction for the ball holder and the cap 22. And positioning of connecting the ball holder 17 and the cap 22 to a bracket 8 is simultaneously further easily performed by engaging an engaging protrusive part 38 of the core 30 with an engaging recessed part 39 of the bracket 8. Accordingly, no-load guide grooves 9, 10 and load guide grooves 13, 14 are accurately connected with the turning groove 34. |
