En anordning omfattende en kombinasjon av et kammer og et stempel

摘要

There is provided a piston-chamber combination comprising an elongate chamber (70) which is bounded by an inner chamber wall (71,73,75) and comprising a piston means (76,76',163) in said chamber to be sealingly movable relative to said chamber at least between first and second longitudinal positions of said chamber, said chamber having cross-sections of different cross-sectional areas at the first and second longitudinal positions of said chamber and at least substantially continuously differing cross-sectional areas at intermediate longitudinal positions between the first and second longitudinal positions thereof, the cross-sectional area at the first longitudinal position being larger than the cross-sectional area at the second longitudinal position, said piston means being designed to adapt itself and said sealing means to said different cross-sectional areas of said chamber during the relative movements of said piston means from the first longitudinal position through said intermediate longitudinal positions to the second longitudinal position of said chamber, wherein the cross-sections of the different cross-sectional areas have different cross-sectional shapes, the change in cross-sectional shape of the chamber (162) being at least substantially continuous between the first and second longitudinal positions of the chamber (162), wherein the piston means (163) is further designed to adapt itself and the sealing means to the different cross-sectional shapes.