| 摘要 |
A piston-chamber combination comprising an elongate chamber which is bounded by an inner chamber wall, and comprising apiston means in said chamber to be sealingly movable relative to said chamber wall at least between a first and a second longitudinal position of the chamber, said chamber having cross-sections of different cross-sectional areas at the first and second longitudinal positions, and at least substantially continuously differing cross-sectional areas at intermediate longitudinal positions between the first and second longitudinal positions, the cross-sectional area at said second longitudinal position being smaller than the cross-sectional area at said first longitudinal position, said piston means can change dimensions thereby providing for different cross-sectional areas ofthe piston means adapting the same to said different cross-sectional areas of the chamber during the relative movements of the piston means beytween the first and second longitudinal positions through said intermediate longitudinal positions of the chamber, said combination engaging a rigid surface. Said combination is movable relative to said surface. |
