| 摘要 |
A piston - chamber combination comprising a chamber (186) which is bounded by an inner chamber wall (185) and comprising a piston inside said chamber to be engagingly movable relative to said chamber wall at least between a first longitudinal position (208) and a second longitudinal position (208 ') 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, said piston comprising a container which is elastically deformable. The piston is produced to have a production - size of the container in the stress -free and undeformed state thereof. This is accomplished by the combination comprising means for introducing fluid from a position outside (210) said container into said container, thereby enabling pressurization of said container, and thereby expanding said container, a smooth surface of the wall of the actuator piston, at least on and continuously until nearby its contact area with the wall of the chamber, thereby displacing said container from a second and to a first longitudinal position of the chamber. |
