| 摘要 |
A telescopic dust collecting pipe includes an outer pipe, an inner pipe inserted in the outer pipe, and a locking mechanism used for locking the relative position of the outer and inner pipe. The inner pipe and the controlling rod form an outer layer oriented groove and an inner layer oriented groove. Relative movement of the controlling rod and inner pipe brings the outer layer oriented groove to coincide or stagger with the inner layer oriented groove. A locking element moved along the radial direction is arranged between the outer pipe and inner pipe. The locking element is pressed against one side of the inner pipe by an elastic element. The relative movement between the controlling rod and inner pipe can cause the double layer oriented grooves to be coincided or staggered, so as to press or to push the locking element into or out of the oriented groove, so that the outer pipe and inner pipe are locked or released.
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