Patent Specification: "Assembly for a drug delivery device and drug delivery device". The present invention relates to an assembly for a drug delivery device (1) provided comprising a housing (3), a cartridge retainer (2) releasably connected to the housing (3), an elastic member (10), and an interaction member (14) which is configured to mechanically cooperate with the elastic member (10) and the cartridge retainer (2). the elastic member (10) is configured to rotatably tilt the interaction member (14). the assembly has a locked state where the cartridge retainer (2) is connected to the housing (3), the cartridge retainer (2) being obstructed from movement with respect to the housing (3), and an unlocked state where the connection between the cartridge retainer (2) and housing (3) is released, cartridge retainer (2) being freely movable with respect to housing (3). To switch from the unlocked state to the locked state, the cartridge retainer (2) is placed in mechanical cooperation with the interaction member (14), the cartridge retainer (2) is rotated in a first direction with respect to the housing (3). , the interaction member (14) thus being rotated in the first direction so that the interaction member (14) mechanically cooperates with the elastic member (10) and such that a rotational force exerted on the interaction member (14) by means of the elastic member (10) is overcome to switch the assembly from the unlocked state to the locked state. In addition, a drug delivery device (1) is provided.resumo patente de invenção: "montagem para um dispositivo de administração de droga e dispositivo de administração de droga". a presente invenção refere-se a uma montagem para um dispositivo de administração de droga (1) é fornecida compreendendo um invólucro (3), um retentor de cartucho (2) liberavelmente conectado ao invólucro (3), um membro elástico (10), e um membro de interação (14) que é configurado para mecanicamente cooperar com o membro elástico (10) e com o rete
