Patent ID: 7008107

Claim:
A linear motion guide unit comprising: a guide rail plate member formed to have a bottom and first side walls extending lengthwise along widthwise opposite sides of the bottom, one to each side, the first side walls being made on their inside surfaces with first raceway grooves extending lengthwise, one to each inside surface, and a slider fit for linear movement in between the first side walls widthwise opposite to one another, the slider being provided on sidewise outside surfaces thereof with second raceway grooves, one to each outside surface, which are in opposition to the first raceway grooves to define load raceways between them to allow rolling elements to run through there, whereby the slider is movable in a sliding manner between the first side walls of the guide rail by virtue of the rolling elements; whereby a stopper construction is installed detachably to any one of forward and aft ends of the guide rail once the slider has fit in the guide rail, so that the slider comes into abutment against the stopper construction while on a movement, thereby being prevented from becoming untethered from the guide rail, wherein the slider has a casing of a plate formed in an U-shape in cross section, which is composed of a top portion and second side walls bent along widthwise opposite sides of the top portion to head downwards, wherein the second raceway grooves are cut in sidewise outside surfaces of the second side walls, wherein the slider is composed of the casing and a circulator laid underneath the casing, which is provided therein with non-loaded areas, each of which includes therein turnarounds communicating with the associated load raceway defined between the raceway grooves confronting one another, and a return passage connecting the turnarounds with each other, wherein the rolling elements are allowed to run through a recirculating circuit comprised of the load raceway, turnarounds and return passage, and wherein the circulator is comprised of upper and lower circulator halves of synthetic resin, which are made therein with grooves semicircular in cross section to produce the turnarounds and the return passages that are circular in cross section to render them suitable for the rolling elements of balls wherein the circulator is made concaved on a lower surface thereof to form a recess extending along a fore-and-aft area corresponding with the stopper pin for the stopper construction so as to allow the stopper pin to go by underneath the slide without any interference between them.