Telescopic tube assembly having a fixing structure

A telescopic tube assembly having a fixing structure, comprising:

• a first tube having a monolithically-formed cylindrical receiving end offset toward a transverse direction relative to a center line of the first tube to form an inward offset arc portion and an outward offset arc portion in the receiving end relative to the first tube, which are opposite to each other at a same height level of the center line of the first tube, wherein the inward offset arc portion is offset inwardly toward the center line of the first tube by a first predetermined distance such that the inward offset arc portion is positioned between the center line and an outer edge of the first tube, and the outward offset arc portion is offset outwardly toward the transverse direction to a position beyond the outer edge of the first tube;
• a second tube having an inserting end, wherein an inner diameter of the first tube is greater than an outer diameter of the second tube;
• and
• a fastening structure disposed within the receiving end of the first tube,
• wherein the inserting end of the second tube is inserted into the first tube through the receiving end;
• by locking the fastening structure, the second tube is pushed against the inward offset arc portion such that the second tube and the first tube are fixed with respect to each other;
• by loosening the fastening structure, the second tube is released from the inward offset arc portion such that the second tube and the first tube are movable relative to each other.