A combination of a chamber and a piston, a pump, a shock absorber, a transducer, a motor and a power unit incorporating the combination

Abstract From the Canadian patent

A piston-chamber combination comprising an elongate chamber which is bounded by an inner chamber wall, and comprising a piston in said chamber to be sealingly movable relative to said chamber wall at least between a first longitudinal position and a second longitudinal position of the chamber said , chamber having cross-sections of different cross-sectional areas and different circumferential lengths at the first and second longitudinal positions and at , least substantially continuously different cross-sectional areas and circumferential lengths at intermediate longitudinal positions between the first and second longitudinal positions the cross-sectional area and , circumferential …