Linear guide apparatus using roller type linear bearing

摘要

A guide rail has a main track surface on an upper surface and sub-track surfaces on both side surfaces. The guide rail is further formed with axially extending grooves in both of the side surfaces respectively below the sub-track surfaces. A slider having a substantially U-shaped cross section has roller type linear bearings which roll respectively on the main track surface and the sub-tract surfaces. The slider is provided with protruding portions at lower surfaces of both side walls of the slider which extend horizontally and inwardly into the grooves of the guide rail. The protruding portions are slidably in contact with inner surfaces of the grooves and prevent the slider from slipping out of the guide rail. Furthermore, seal members made from rubber are attached respectively to lower surfaces of the protruding portions so that inner edges of the seal member are slidably in contact with the inner surfaces of the groove.