Sleeve bracket assembly

A sleeve bracket assembly comprising:

• a rail base including:
• two side boards extending in a direction, being parallel to each other, and disposed vertically at an interval and having:
• two sliding rails respectively protruding from inner surfaces of the two side boards and facing each other;
• a sliding channel formed between the inner surfaces of the two sliding rails;
• and
• a notch formed between the two sliding rails and communicating with the sliding channel;
• a positioning board being an elongated strip, integrally connecting with bottoms of the sliding rails, and having an abutment portion having a curved cross section perpendicular to the direction and protruding upwardly and protruding into the sliding channel via the notch, with the abutment portion having a constant vertical thickness inside the notch;
• and
• multiple positioning mounts movably mounted in the sliding channel of the rail base and unrestrictedly rotatable relative to the abutment portion, with each positioning mount including:
• a sliding portion having an abutment surface formed on a bottom of the sliding portion;
• and
• a socket portion integrally formed on a top surface of the sliding portion, wherein the multiple positioning mounts are mounted in the sliding channel by the sliding portion, wherein the abutment surfaces of the multiple positioning mounts abut the abutment portion of the positioning board, and wherein the sliding portions of the multiple positioning mounts abut inner sides of the two sliding rails.