Abstract: In sealing means for a slider unit in which sealing members of foam rubber are arranged to close sidewise clearances left open between a dustproof cover and side walls of a track rail, the improved sealing means is directed to making sure of effective sealing performance, prolonging a durable service life of the sealing member, and also making mounting of the sealing member to the clearances easier. Sealing members of flexible foam rubber rich in restoring force are arranged in the clearance between the dustproof cover and the side walls of the track rail. The sealing members, while fastened to the dustproof cover, are allowed to experience any deformation of expansion/collapse when sideward wings of the slider moves back and forward between the confronting sealing members and the side walls, with keeping close sliding engagement with the associated surfaces of the wings.

Abstract: In sealing means for a slider unit in which sealing members of foam rubber are arranged to close sidewise clearances left open between a dustproof cover and side walls of a track rail, the improved sealing means is directed to making sure of effective sealing performance, prolonging a durable service life of the sealing member, and also making mounting of the sealing member to the clearances easier. Sealing members of flexible foam rubber rich in restoring force are arranged in the clearance between the dustproof cover and the side walls of the track rail. The sealing members, while fastened to the dustproof cover, are allowed to experience any deformation of expansion/collapse when sideward wings of the slider moves back and forward between the confronting sealing members and the side walls, with keeping close sliding engagement with the associated surfaces of the wings.

Abstract: A ball joint or ball-and-socket joint assembly includes a ball unit terminating in a ball at one end and a socket unit terminating in a socket at one end, whereby the ball of the ball unit is movably received in the socket of the socket unit, so that the ball unit may move relative to the socket unit over a predetermined angle in all planes passing through a common center line defined by the socket. The ball unit includes a ball section, a cut-away section, a nut section and a threaded section in the order mentioned from top to bottom, and the ball section includes an extended portion which is formed by plastic deformation when the ball section is subjected to roll rolling and which partly extends into the space defined by the cut-away section to thereby provide an increased spherical contact surface which may be brought into sliding contact with a spherical surface of the socket.