Patent ID: 7258486

Claim:
A linear motion guide unit; comprising a guide rail having a pair of first raceway grooves extending in lengthwise direction of the guide rail, a slider conforming to the guide rail for movement relatively to the guide rail and also having second raceway grooves in opposition to the first raceway grooves, and more than one rolling element allowed to roll through load races defined between the first and second raceway grooves, the slider being made therein with forward and aft turnaround passages and return passages, the forward and aft turnaround passages being each communicated at one end thereof with the associated load race and at the other end thereof with the associated return passage to make a recirculating circuit allowing the rolling elements to circulate through there; wherein the slider includes a carriage made therein with the second raceway grooves and first return grooves for the return passages, a first member extended across lengthwise opposite ends of the carriage and provided at lengthwise opposite ends thereof with forward and aft turnaround surfaces to form the forward and aft turnaround passages communicated with lengthwise opposite ends of the associated second raceway groove, and a second member having thereon forward and aft turnaround grooves to form the forward and aft turnaround passages in conjunction with the forward and aft turnaround surfaces, and second return grooves to form the return passages in conjunction with the first return grooves; and wherein the first member is applied to any one surface of the carriage while the second member is applied to any other surface of the carriage to put firmly the carriage between the first and second members, and just the first and second members are joined to one another with engaging means.