Piston securing device

摘要

A cartridge contains a storage chamber for a fluid filler material in which a piston can be movably received, wherein the storage chamber has a filling end and a discharge end and an inner wall extending between the filling end and the discharge end and the piston is displaceable in the storage chamber from the filling end to the discharge end along the inner wall to discharge the filler material from the storage chamber and the filler material can be enclosed in a sealing manner in the storage chamber by the piston. The piston is captively held within the inner wall by a projection provided at the inner wall in the environment of the filling end.

主权项

1. A cartridge containing a storage chamber for a fluid filler material in which a piston is movably receivable, wherein the storage chamber has a filling end and a discharge end and an inner wall extending between the filling end and the discharge end and the piston is displaceable in the storage chamber from the filling end to the discharge end along the inner wall to dispense the filler material from the storage chamber and the filler material can be sealingly enclosed in the storage chamber by the piston at the filling end, characterized in that the piston is captively held within the inner wall by a projection provided at the inner wall in the environment of the filling end wherein the projection is configured as a spring element, and wherein the spring element comprises:
a shoulder element connected to the inner wall; a middle piece; and a finger element; and the middle piece and the finger element are rotatable or bendable about the shoulder element; and wherein the finger element has a curvature with a radius of curvature of at least 0.3 mm.