Patent ID: 8262604

Claim:
A disposable injector comprising: a housing ( 10 ) in which or on which are arranged, in each case at least in some areas, at least one mechanical spring energy reservoir ( 50 ), the housing ( 10 ) includes an intermediate base ( 32 ) having at least one bearing surface ( 37 ) or outer face ( 33 ) located proximate a housing edge ( 36 ), at least one cylinder/piston unit ( 100 ) that can be filled at least temporarily with active substance, a piston-actuating ram ( 60 ) and at least one trigger unit ( 80 ), the piston-actuating ram ( 60 ) includes a ram plate ( 73 ), the spring energy reservoir ( 50 ) includes at least one pre-tensioned spring element, each of the at least one pre-tensioned spring elements rests on the ram plate ( 73 ) having a substantially flat upper surface, at least part of the piston-actuating ram ( 60 ) is arranged in operative position between the spring energy reservoir ( 50 ) and a piston ( 111 ) of the cylinder/piston unit ( 100 ), the ram plate ( 73 ) as a monolithic portion thereof includes at least two tension bars ( 61 ) the bottom of each tension bar ( 61 ) beginning directly from and as part of the substantially flat upper surface of the ram plate ( 73 ), the at least two tension bars ( 61 ) are transversely movable at least in some areas, support portions ( 65 ) operatively affixed to or a monolithic portion of the tension bars ( 61 ), the support portions ( 65 ) in a pre-actuated position are supported by the at least one bearing surface ( 37 ) or outer face ( 33 ) of the housing ( 10 ) proximate the housing edge ( 36 ), whereby the piston-actuating ram ( 60 ) is in supportive relationship with the tensioned spring energy reservoir ( 50 ) in the pre-actuated position, the trigger unit ( 80 ) is or has at least one includes a trigger element ( 81 , 82 ) positioned in operative arrangement with the support portions ( 65 ), the trigger unit ( 80 ) when actuated, for causing or for enabling a movement of the support portions ( 65 ) away from the bearing surface ( 37 ) or outer face ( 33 ) and the housing edge ( 36 ) of the housing ( 10 ), each tension bar ( 61 ) forms, together with one of the support portions ( 65 ), an outwardly resilient retaining hook ( 62 ), in the pre-actuated or locked position, engages over the housing edge ( 36 ), each retaining hook ( 62 ) has an inner wall which is part of an envelope surface ( 68 ) having the shape of a frustoconical jacket-shaped hollow space ( 67 ) located between the retaining hooks ( 62 ) enclosed by envelope surface ( 68 ), the frustoconical jacket-shaped hollow space ( 67 ) having cross-sections that increase the further the cross-sections are from the ram plate ( 73 ), the retaining hooks ( 62 ) adjacent to one another has radial slits ( 69 ) lying between adjacent retaining hooks ( 62 ), each radial slit ( 69 ) beginning at the upper flat surface of ram plate ( 73 ), each radial slits ( 69 ) increasing in size from the ram plate ( 73 ) toward the top of the adjacent retaining hooks ( 62 ).