A slide rail comprises a longitudinal body and a pair of longitudinal supporting structures extended from two sides of the longitudinal body. Each of the supporting structures has a U-shaped cross section and includes a first supporting arm and a second supporting arm bent relative to the first supporting arm. A ball raceway is formed on one of the first supporting arm and the second supporting arm. The slide rail is applicable to a slide rail assembly for increasing strength.

A sliding member includes a carbon transfer layer and can superiorly effectively decrease friction and reduce wear. A method produces the sliding member. The sliding member includes a substrate and a carbon transfer layer. The carbon transfer layer is disposed on the surface of the substrate and includes both sp.sup.2 bonded carbon and sp.sup.3 bonded carbon. The carbon transfer layer preferably has a ratio sp.sup.3/(sp.sup.2+sp.sup.3) of the sp.sup.3 bonded carbon to the totality of the sp.sup.2 bonded carbon and the sp.sup.3 bonded carbon of 0.1 or more.

A precision linear bearing is designed to minimize the points of contact, rolling and rubbing, to reduce particulates and FOD while ensuring stability and accuracy in a manner suitable for a clean room environment. The linear bearing comprises at least first and second bearing layers within a one-piece housing. Each bearing layer comprises at least three roller bearing spaced around the axial bore in a first plane within the housing, each roller bearing having an axis of rotation substantially perpendicular to the axial bore and projecting into said axial bore for engagement of a linear member extending through the axial bore. Each roller bearing suitably engages the linear member at a single point of contact. The layers are rotationally offset from one another such that the roller bearings contact different positions around the circumference of the linear member. The linear bearing may be configured to engage the inner surface of a cylindrical member.

A securable rail guide contains a guide rail, a runner rail arranged in the guide rail and able to travel along the guide rail, and a securing unit which is embodied to fix the runner rail in position in the guide rail in a releasable manner. A locking unit is arranged on the guide rail and is embodied to secure the runner rail in a locked position, and an unlocking unit is arranged on the runner rail. The locking unit and the unlocking unit are parts of the securing unit. The unlocking unit is operatively connected to the locking unit such that an actuation of the unlocking unit releases the runner rail to allow a free movement along the guide rail. This configuration provides a separation of the locking and unlocking mechanisms, as a result of which an independent configuration of the stability of the overall locking mechanism is possible.

A slide rail assembly includes a first rail, a second rail, a blocking feature, and a component. The two rails can be displaced with respect to each other. The blocking feature is provided at one of the two rails, and the component at the other of the two rails. When the second rail is at a predetermined position with respect to the first rail, a blocking portion of the blocking feature and a predetermined portion of the component are blocked by each other to prevent the second rail from being displaced with respect to the first rail from the predetermined position in a predetermined direction. One of the blocking portion and the predetermined portion forms a non-vertical structure.

A slide rail assembly includes a first rail, a second rail, a blocking feature, and a component. The two rails can be displaced with respect to each other. The blocking feature is provided at one of the two rails, and the component at the other of the two rails. When the second rail is at a predetermined position with respect to the first rail, a blocking portion of the blocking feature and a predetermined portion of the component are blocked by each other to prevent the second rail from being displaced with respect to the first rail from the predetermined position in a predetermined direction. One of the blocking portion and the predetermined portion forms a non-vertical structure.

A rolling element shaft assembly includes a solid shaft having a first end and a second end, a tubular shaft configured to receive the shaft first end, and a bearing sleeve coupled to the solid shaft. The bearing sleeve includes a first portion defining a first edge, a second edge, and at least one first bearing aperture, and a second portion defining a third edge, a fourth edge, and at least one second bearing aperture. The first portion is configured to couple to the second portion about the solid shaft. The bearing sleeve further includes at least one first bearing disposed within the at least one first bearing aperture and at least one second bearing disposed within the at least one second bearing aperture.

A rolling element shaft assembly includes a solid shaft having a first end and a second end, a tubular shaft configured to receive the shaft first end, and a bearing sleeve coupled to the solid shaft. The bearing sleeve includes a first portion defining a first edge, a second edge, and at least one first bearing aperture, and a second portion defining a third edge, a fourth edge, and at least one second bearing aperture. The first portion is configured to couple to the second portion about the solid shaft. The bearing sleeve further includes at least one first bearing disposed within the at least one first bearing aperture and at least one second bearing disposed within the at least one second bearing aperture.

A telescopic shaft is provided. The telescopic shaft includes a first shaft including a first coupler having an inner circumferential surface including an external straight groove and an external inclination groove formed thereon, the external straight groove having a semi-circular cross section and being formed in parallel to a rotation axis and the external inclination groove having a semi-circular cross section, being inclined with respect to the external straight groove at a predetermined angle, and being shaped like a spiral, a second shaft including a second coupler inserted into the first coupler and having an outer circumferential surface including an internal straight groove and an internal inclination groove formed thereon, the internal straight groove having a semi-circular cross section and corresponding to the external straight groove and the internal inclination groove having a semi-circular cross section, being inclined in an opposite direction to the external inclination groove at a predetermined angle with respect to the internal straight groove, and being shaped like a spiral, and a plurality of balls arranged in a line in an axial direction between the external straight groove and the internal straight groove, one ball being arranged between the external inclination groove and the internal inclination groove, wherein the first shaft and the second shaft are coupled to extend and retract in an axial direction, thereby preventing play from occurring in a circumferential direction and preventing separation of balls.

A seat track assembly including a first rail configured to move along a second rail. The assembly may include a roller cage disposed at least partially between the first rail and the second rail. In embodiments, the assembly includes a stopper that projects from an inner surface of the second rail and is configured to restrict movement of the roller cage while the movement of the first rail relative to the second rail is independent of the stopper.