Cuff for joining an inner and an outer pipe

(57) The cuff for joining the summary inner side pipe 16 and the outside pipe 14 of each other is equipped with the housing part and the connecting member 28. The connecting member 28 is located in the plane prolonged in a transverse direction to the Nagate axis line of both the pipes 14 and 16 at the time of use. The connecting member 28 has a mutual catching part for carrying out mutual engaging of clutch to an actuator and the inner side pipe 16. When a mutual catching part is located on the side of the inner side pipe 16 which is separated from the actuator 30 at the time of use, therefore the connecting member 28 moves in the inside of a plane in the case of a drive, a mutual catching part is solved from the inner side pipe 16. A pair of projection parts by which opposite arrangement was carried out are positioned in the connecting member 28, and compression spring acts between each projection part and a housing part, for this reason, a mutual catching part is 付勢 (ed), and engaging of clutch is carried out to the inner side pipe 16.