Telescopic Tube, Telescopic Rod Incorporating the Same and Application thereof

A telescopic tube, comprising:

• an inner tube, an outer tube, and a locking mechanism located between the inner tube and the outer tube, wherein the locking mechanism comprises a fixed base secured to an end of the inner tube, a sliding frame disposed inside the outer tube and sliding axially along the outer tube, and an expansion block arranged adjacent to the outer tube, wherein the sliding frame and the fixed base are in helical fit in direction along a centerline of the telescopic tube, and when the inner tube and the outer tube are extended to any position, the sliding frame drives the expansion block to approach the fixed base, while an interference force is generated between the expansion block and the fixed base, enabling the expansion block to expand outward and tightly interfere with the outer tube;
• and
• wherein when the inner tube rotates, the fixed base rotates with a center of the inner tube as an axis, pushing the sliding frame to slide axially, the inner tube and the outer tube retract, the expansion block moves away from the fixed base, the expansion block recesses inward and approaches the sliding frame, and tends to disengage from interference with the outer tube, wherein a rotation range of the inner tube is less than or equal to 270°.