Quick coupling arrangement for a telescopic shaft

A quick coupling arrangement installed in a telescopic shaft between an upper shaft section, which has a neck near a bottom end thereof, and a lower shaft section, which is slidably inserted into said upper shaft section, and rotated between a locking position where said upper shaft section and said lower shaft section are prohibited from axial movement relative to each other, and an unlocking position where said upper shaft section and said lower shaft section are allowed to be moved axially relative to each other, the quick coupling arrangement comprising:

• a connector fixedly fastened to a top end of said lower shaft section and moved with said lower shaft section in said upper shaft section above the neck of said upper shaft section, said connector comprising a cylindrical mounting base disposed at one end and plugged into the top end of said lower shaft section, a tapered coupling body disposed outside said lower shaft section and suspended inside said upper shaft section, and a collar raised around the periphery thereof between said mounting base and said tapered coupling body and stopped outside said lower shaft section and moved with said lower shaft section in said upper shaft section above the neck of said upper shaft section, said tapered coupling body comprising a double thread, a top stop flange, and a neck disposed between said double thread and said top stop flange;
• a screw cap mounted on said tapered coupling body of said connector and moved between the top stop flange and collar of said connector, said screw cap comprising a longitudinal split, an embossed peripheral wall for engagement with an inside wall of said upper shaft section, a tapered coupling hole, which receives the tapered coupling body of said connector, and an internal thread disposed in said tapered coupling hole and threaded onto said double thread of said tapered coupling body of said connector;
• and,
• a bushing fixedly fastened to the bottom end of said upper shaft section to guide axial movement of said lower shaft section in said upper shaft section, said bushing having a top end stopped at the neck inside said upper shaft section and a bottom end terminating in a hooked flange hooked on the bottom end of said upper shaft section.