| 摘要 |
<p>A multi-level free telescopic rod comprises n levels of outer pipes (11, 12, 13), n levels of positioning elastic pieces (16, 17), n levels of positioning pieces (18, 19) and n levels of rotating inner pressing pieces (20, 21), wherein n is a natural number. The telescopic rod further comprises (n+1) levels of inner pipes (22, 23, 24), (n+1) levels of outer pipes, an external rotating piece (25) and a spring (26). The inner wall of each level of outer pipe is evenly provided with a plurality of sawtooth-level positions (111, 121, 131). Each level of the positioning piece is provided with notches. One end of each level of the positioning elastic piece is correspondingly fixed in each level of the positioning piece. The other end of each positioning elastic piece penetrates through the notches on each level of the positioning piece and is then clamped with the sawtooth level positions of each outer pipe. The telescopic rod can freely stretch, clamp, and auto-return.</p> |
