Patent ID: 6053062
Filing Date: 2000-04-25
Classification: F16C,F16H,Y10T

Abstract:
A linear motion apparatus, which comprises:a linear track rail having a roller running groove extending linearly;a feeding threaded shaft rotatable arranged in parallel with said track rail; anda movable block arranged movably on said track rail through a plurality of rollers, and provided with a nut portion having a threaded bore into which said feeding thread shaft is to be screwed;said movable block comprising (i) a block body having a roller running counter-groove which faces on the roller running groove of said track rail and a roller returning passage arranged away from said roller running counter-groove at a prescribed distance and (ii) a direction changing passage forming member at each end of said block body, each of which members forms a U-shaped direction changing passage connecting said roller running counter-groove and said roller returning passage to each other;said movable block being linearly moved on said track rail through said rollers by rotating said feeding threaded shaft; andsaid nut portion being integrally formed with at least one of said direction changing passage forming members, and a position of a center axis of the threaded bore of said nut portion being determined by said at least one of said direction changing passage forming members on a basis of a position of said roller running counter-groove,wherein;said direction changing passage forming members comprise an inner member forming an inner guide surface for said direction changing passage and an outer member forming an outer guide surface for said direction changing passage, and said nut portion is integrally formed with said outer member.