Linear motion rolling contact guide unit having an enhanced seal characteristic

A linear motion rolling contact guide unit, comprising:

• a rail extending over a desired length, said rail having a top surface, a pair of ground side surfaces and a bottom surface and each of said side surfaces being formed with a ground first guide groove extending in parallel with a longitudinal axis of said rail and also a ground tapered relief trench at the bottom of said first guide groove also extending in parallel with the longitudinal axis of said rail, said trench having straight-line tapered inwardly-converging side walls;
• a slider slidably mounted on said rail, said slider being formed with a pair of second guide grooves each located opposite to an associated one of said first guide grooves to thereby define a guide channel, said slider being provided with an end seal having a first lip in sliding contact with said relief trench straight-line tapered side walls and a discrete bottom seal having a second lip in sliding contact with a selected portion of said side surfaces of said rail wherein said selected portion is a flat-bottomed side recess below and of less depth than said first guide groove of said rail having a ground surface;
• a plurality of rolling members interposed between said rail and said slider in said guide channel;
• and
• wherein said first lip further is in sliding contact with the top surface of said rail, and a side surface portion between said rail top surface and said tapered relief trench.