A slide rail assembly includes a first rail including a blocking member and a positioning member, a second rail including a predetermined feature, a working member and an operation member. When the second rail is at a first extending position, the blocking member is in a blocking state capable of blocking the working member so as to prevent the second rail from displacing along a retracting direction. The operation member is capable of being operated to drive the blocking member to leave the blocking state so as to allow the second rail to displace along the retracting direction. When the second rail is displaced from the first extending position to a second extending position along the retracting direction, the second rail is engaged with the positioning member through the predetermined feature so as to prevent the second rail from leaving the second extending position.

A drawer slide including a base member, a roller support, ball bearings and roll pins. The base member a track base and first and second walls. The first and second walls and the track base define a first channel. The first wall has a first race and the second wall has a second race. The roller support is within the first channel. The roller support has first and second side walls and a center section disposed between the first and second side walls. The first and second side walls are disposed adjacent the first and second walls. The center section is disposed adjacent the track base. The first and second side walls have bearing apertures. The center section has roller openings. The ball bearings are disposed the first and second races. The roll pins are in the roller openings in rolling contact with the track base.

A drawer slide including a base member, a roller support, ball bearings and roll pins. The base member a track base and first and second walls. The first and second walls and the track base define a first channel. The first wall has a first race and the second wall has a second race. The roller support is within the first channel. The roller support has first and second side walls and a center section disposed between the first and second side walls. The first and second side walls are disposed adjacent the first and second walls. The center section is disposed adjacent the track base. The first and second side walls have bearing apertures. The center section has roller openings. The ball bearings are disposed the first and second races. The roll pins are in the roller openings in rolling contact with the track base.

A slide rail assembly and a slide rail kit are provided. The slide rail assembly includes a first rail, a second rail, a blocking member, and an operating member. The blocking member is movably mounted on the second rail. When the second rail is positioned at an extending position relative to the first rail, a blocking feature of the first rail blocks the blocking member at a first state, so as to prevent the second rail from being moved from the extending position in a retracting direction. The operating member is operated to be positioned at a position that moves the blocking member from the first state to a second state, such that the blocking feature is unable to block the blocking member at the second state. The operating member is engaged with the predetermined portion of the second rail to be retained at the position.

A sliding rail positioning device includes a first rail, a second rail, and a third rail. The second rail includes a second body and a second holding member. The second body defines a first receiving hole. The third rail includes a third body and a third holding member. When the second body is driven by the first rail to slide out, the third holding member is biased toward the second body to be received in the first receiving hole, so that the second body cannot be retracted back. When the first rail is retracted, the first rail presses the second holding member to press the third holding member out of the first receiving hole so that the second body can be retracted.

A running carriage for a drawer pull-out guide, the running carriage includes a base body and a plurality of load-transmitting rolling bodies arranged in or on the base body. The load-transmitting rolling bodies are rotationally supported on the base body about a rotational axis orientated in a first direction. The running carriage further includes a first roller and a second roller rotationally supported on the base body about a rotational axis orientated in a second direction. The rotational axis oriented in the second direction extends transversely to the rotational axis orientated in the first direction, and the first roller has a larger diameter than the second roller.

An embodiment of the present invention provides a pull-out system comprising: at least two slide rails each having a fixed rail, a middle rail slidably arranged on the fixed rail, and a movable rail slidably arranged on the middle rail; and a synchronization means for synchronizing the movement of the movable rail, wherein the synchronization means comprises a roller unit, a synchronization bar connected to the roller unit, and a deflectable element having an end portion fixe to the roller unit and an opposite end portion connected to the movable rail, and the movable rail is configured to move as much as the amount of rotation of the roller unit.

An embodiment of the present invention provides a pull-out system comprising: at least two slide rails each having a fixed rail, a middle rail slidably arranged on the fixed rail, and a movable rail slidably arranged on the middle rail; and a synchronization means for synchronizing the movement of the movable rail, wherein the synchronization means comprises a roller unit, a synchronization bar connected to the roller unit, and a deflectable element having an end portion fixe to the roller unit and an opposite end portion connected to the movable rail, and the movable rail is configured to move as much as the amount of rotation of the roller unit.

A slide rail assembly includes a first rail, a supporting member and a second rail. The supporting member is arranged on the first rail and includes a first supporting portion, a second supporting portion and a guiding portion arranged between the first supporting portion and the second supporting portion. When the second rail is mounted into the passage of the first rail, the first supporting portion is configured to support the second rail. When the second rail is moved along a mounting direction, the second rail is guided to the second supporting portion through the guiding portion.

A slide rail assembly includes a first rail, a supporting member and a second rail. The supporting member is arranged on the first rail and includes a first supporting portion, a second supporting portion and a guiding portion arranged between the first supporting portion and the second supporting portion. When the second rail is mounted into the passage of the first rail, the first supporting portion is configured to support the second rail. When the second rail is moved along a mounting direction, the second rail is guided to the second supporting portion through the guiding portion.