US Patent 7607855 Positioning sleeve for a telescopic rod

A positioning sleeve includes first and second surrounding portions adapted to surround outer and inner tube sections of a telescopic rod, respectively. The second surrounding portion has a plurality of angularly spaced-apart recessed parts and a plurality of compressible retaining units respectively disposed in the recessed parts. Each retaining unit is connected to the corresponding recessed part, and has an engaging part projecting toward a through hole in the second surrounding portion, and a deformable space defined between the engaging part and the respective recessed part. The deformable space is deformed when the inner tube section is friction-fitted into the second surrounding portion and when the engaging part of each retaining unit abuts the inner tube section.