A COMBINATION OF A CHAMBER AND A PISTON, A PUMP, A MOTOR, A SHOCK ABSORBER AND A TRANSDUCER INCORPORATING THE COMBINATION

摘要

A piston-chamber combination has an elongate chamber with a piston movable therein between first and second positions. The chamber has cross-sections of different areas and different circumferential lengths at the two positions, and substantially continuously different cross-sectional areas and circumferential lengths at intermediate positions, area and circumferential length at the second position being smaller than that at the first. The piston is elastically deformable and has other features to adapt to the different cross-sectional areas and circumferential lengths of the chamber during movements of the piston.