The present invention relates to a cap assembly to be used with a medicament delivery device, which medicament delivery device comprises a housing and a medicament container holder (20), said cap assembly comprising a retainer member (134) connectable to the medicament container holder, a hub (148) comprising a needle (152) having a proximal end (154) and a distal end (156), said hub being coaxially movable within the retainer member, a removable inner cap (146) interactively connected to the hub (134) and to the retainer member (134), a removable outer cap (132) being coaxially arranged to the inner cap, and a cap clutch mechanism (166) comprising a locking member (168) which is axially movable in relation to said inner and outer caps between a disengaged position in which said locking member is disconnected from the outer and the inner cap such that the outer cap is rotatable in relation to said inner cap and an engaged position in which said locking member is connected to the outer and to the inner cap such that the outer cap is rotationally locked to the inner cap. The invention is characterised in that the cap clutch mechanism (166) further comprises clutch biasing means (180) arranged between the outer cap and the locking member, said clutch biasing means (180) being capable of biasing the locking member for keeping it in the disengaged position.本發明有關一蓋組合件,其與藥物輸送裝置一起使用,該藥物輸送裝置包括外殼及藥物容器夾具(20),該蓋組合件包括夾持構件(134),可連接至該藥物容器夾具;轂件(148),包括具有近側端(154)與遠側端(156)之針(152),該轂件係可在該夾持構件內同軸向地運動;可移除的內蓋(146),相互作用地連接至該轂件(134)及連接至該夾持構件(134);可移除的外蓋(132),被同軸向地配置至該內蓋;及蓋離合器機件(166),包括一鎖定構件(168),其係關於該內蓋及外蓋在脫離位置與嚙合位置之間可軸向地運動,在該脫離位置中,該鎖定構件係由該外蓋及該內蓋拆開,使得該外蓋係可關於該內蓋旋轉,而在該嚙合位置中,該鎖定構件係連接至該外蓋及該內蓋,使得該外蓋係可旋轉地鎖定至該內蓋。本發明之特徵在於該蓋離合器機件(166)另包括被配置於該外蓋及該鎖定構件間之離合器偏向機構(180),該離合器偏向機構(180)係能夠使該鎖定構件偏向,用於將其保持在該脫離位置中。132‧‧‧外蓋134‧‧‧夾持構件136‧‧‧護罩前部137‧‧‧遠側表面145‧‧‧間隔環146‧‧‧內蓋148‧‧‧轂件156‧‧‧針端163‧‧‧障壁168‧‧‧鎖定構件180‧‧‧離合器偏向機構
