A top cover along with a track rail unit and guide unit on which it is equipped

摘要

A top cover (19) is disclosed that is able to reduce the number of processing steps required for processing and assembly of the entire guide unit (1) into which the top cover (19) itself is included as one of its parts, contribute to reduced costs, facilitate easy attachment and removal to and from a track rail (1), and be installed on various types of track rails that have already been installed on a machine tool and so forth. In addition, a track rail unit (1) is disclosed that is composed by combining the top cover (19) and track rail (1), and a guide unit is disclosed that contains the track rail unit. The above effects are obtained by using fastening member insertion holes (1d) formed in a track rail (1), and employing a top cover (19) having an engaging portion that elastically fits into those insertion holes (1d).