Patent ID: 7461582
Filing Date: 2008-12-09
Classification: F04B,F15B,F16F

Abstract:
1. A device comprising a combination of a chamber and a piston positioned inside the chamber, the chamber and the piston relatively movable to each other in a predetermined direction of movement between a first position and a second position, characterized by the fact that the cross-section of the piston ( 230 ) in a plane perpendicular to the direction of movement is larger at a first piston position than at a second piston position, the change of the crosssection of the piston ( 230 ) is essentially continuous between the first piston position and the second piston position, the cross-section of the chamber ( 231 ) in a plane perpendicular to the direction of movement is larger at the first position than at the second position, the change of the crosssection of the chamber is essentially continuous between the first position and the second position and the cross-section of the chamber ( 231 ) is arranged to adapt itself to the crosssection of the piston ( 230 ).