The disposable injector has housing (10) provided with blocking surfaces between which displacement structure is arranged. An actuation ram (60) is pivoted about longitudinal axis (5) of injector main portion. The displacement segments are arranged offset in relation to blocking surfaces, such that displacement segments are contacted with displacement structure. The travel limit of displacement structure loaded by displacement segment is cancelled to release energy storage unit by movement of trigger sleeve (90) along direction of longitudinal axis.
