Patent ID: 8105271

Claim:
In combination with a disposable injector with a housing ( 200 ) in which or on which are arranged, in each case at least in some areas, at least one mechanical spring energy reservoir ( 50 ), at least one cylinder/piston unit ( 100 ) that can be filled at least temporarily with active substance, at least one piston-actuating ram ( 60 ) and at least one trigger unit ( 80 ), the piston-actuating ram ( 60 ) is positioned between the spring energy reservoir ( 50 ) and the piston ( 111 ) of the cylinder/piston unit ( 100 ) including a cylinder ( 101 ), the spring energy reservoir comprises at least one pretensioned spring element ( 50 ), and the spring-loaded piston-actuating ram ( 60 ) is supported on the housing ( 200 ) in a releasable manner, the improvement which comprises: the housing ( 200 ) is made from a thin-walled sheet-metal part ( 201 ), the sheet-metal part ( 201 ) has at least two branches ( 220 ), the branches ( 220 ) each have, at the free ends thereof, an angled retaining element ( 221 ) or a recess as a means of receiving the cylinder ( 101 ) of the cylinder/piston unit ( 100 ), the branches ( 220 ) are elastic flexural beams which, in the middle area, are each bent in a Z-shape or S-shape to form a supporting portion ( 231 ) for the piston-actuating ram ( 60 ), each supporting portion ( 231 ) is adjoined by a bearing portion ( 232 ), a contact zone situated between the individual supporting portion ( 231 ) and the piston-actuating ram ( 60 ) represents a wedge gear pairing that forces the respective branch ( 220 ) outwards, and the trigger unit ( 80 ) comprises at least a trigger element ( 82 ) which is slidably supported on the metal sheet part ( 201 ), wherein the support portion ( 231 ) or, respectively the bearing portions ( 232 ) extend outwardly into rear longitudinal grooves ( 83 ) at least one locking tongue ( 190 ) arranged on the at least two branches ( 220 ), the at least one trigger unit ( 82 ) having corresponding openings to received the at least one locking tongue ( 190 ) for locking the housing ( 200 ) in predetermined position.