Patent ID: 8091695

Claim:
A vibration damper for attachment to an object that is subject to vibration, the vibration damper comprising: an outer body defining an interior space that contains a dampening medium, an oscillatory member fitted slidably as a piston in the interior space and dividing the interior space of the outer body into first and second chambers, first and second dampening elements disposed in the first and second chambers respectively of the interior space, wherein each dampening element comprises a body part having flow openings, a dampening part arranged against the body part, the dampening part having openings aligned with the flow openings of the body part, and a cover part arranged against the dampening part, the cover part being movable in relation to the dampening part for changing the cross-sectional flow area of the openings of the dampening part, and wherein as the oscillatory member moves, the dampening medium flows through the flow openings of the body part and the openings in the dampening part whereby the dampening medium dampens the movement of the oscillatory member, and a means defining a flow channel between the first dampening element and the second dampening element, whereby as the oscillatory member moves, the dampening medium flows between the first and second chambers via the first dampening element, the flow channel and the second dampening element.