Abstract: A clarinet coupling structure comprises at least one first hollow tube and at least one second hollow tube that are fastenable by swiveling. The first hollow tube includes a first coupling portion and a plurality of first bumps located on the surface of the first coupling portion. The first bumps are spaced by a plurality of first gaps formed between them. The second hollow tube includes a second coupling portion and a plurality of second bumps located on the surface of the second coupling portion. The second bumps are spaced by a plurality of second gaps formed between them to receive the first bumps. The second gaps also have a plurality of lateral movement sections to allow the first bumps to slide in and latch inside. Through such a structure, various elements of wind instruments can be assembled and disassembled quickly and damage can also be prevented.

Abstract: The present invention discloses an octave-key transfer-bar protection device, which is installed on a saxophone to protect an octave-key transfer-bar on the saxophone, and which comprises a structure body, and a collision-protection bar arranged on the structure body and encircling an accommodation space. The structure body is fixed to the external surface of the saxophone. The octave-key transfer-bar is arranged inside the accommodation space and encircled by the collision-protection bar. The collision-protection bar can protect the octave-key transfer-bar from being deformed by collision. Thus, the performer can correctly lower or raise the gamut via the octave-key transfer-bar.