Patent ID: 8403562

Claim:
A linear motion guide system with a wiper seal, comprising: a guide rail made thereon with a lengthwise raceway surface; and a slider allowed to move on the guide rail in a sliding manner through a plurality of rollers; the wiper seal installed on any one of forward and aft ends of the slider, the wiper seal comprising a compact sheet of a precursor polyester polyurethane foam having a skeleton texture of a porous three-dimensional construction the compact sheet having a thickness equal to one tenth of the thickness of the precursor polyester polyurethane foam and further having a reticular skeleton texture including compacted continuous cells that spread uniformly throughout the compact sheet to have a density of 0.58 g/cm 3 and a porosity of 52%, and the compacted continuous cells in the wiper seal being impregnated with lubricant; a cassette installed on the slider, the wiper seal disposed within the cassette such that the cassette fits over the wiper seal and an inward edge of the wiper seal surrounds the guide rail and is in sliding engagement with the guide rail to exert an interference with the guide rail; wherein the cassette comprises a locating pin therein and the wiper seal has a raised portion that moves into sliding engagement with the raceway surface, the wiper seal being put inside the cassette such that the locating pin fits into the raised portion of the wiper seal; wherein the cassette comprises an end wall of which an inward edge around the guide rail is kept from touching the guide rail with a clearance and a closure sheet stowed in the cassette in opposition to the end wall in a way that an inward edge around the guide rail is also kept from touching the guide rail with a clearance, and the wiper seal fits between the end wall and the closure sheet; and wherein the compacted continuous cells exhibit capillary action and porosity sufficient to soak up and hold the lubricant therein, thereby permitting seepage of lubricant out of or into the compacted continuous cells.