A sliding track assembly is disclosed formed of a sliding member, a track member, a supporting shaft member that is formed of two T-bars arranged together in reversed directions, and pairs of spring members. When moving the sliding member along sliding grooves of the track member, the combined length of the two T-bars is changed, and the spring members release preserved energy to push the sliding member to the extended or received position automatically when the movable fulcrum between the sliding member and the track member passes over the fixed fulcrum. The invention further provides a hinge structure and sliding track assembly arrangement using the said sliding track assembly.
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