Patent attributes
A damper unit includes first and second chambers, a first piston dividing the first chamber into first and second volumes, and a second piston dividing the second chamber into third and fourth volumes. Each piston is moveable along the respective chamber. The second chamber has a cross-sectional area that is smaller than the cross-sectional area of the first chamber so that the second chamber at least partially slides inside the first chamber and at least part of the first chamber can be located around the outside of the second chamber. The first piston is attached to the part of the second chamber that slides inside the first chamber. The position of the second piston is fixed relative to the first chamber as the second chamber slides relative to first chamber. The length of the damper unit changes as the second chamber slides relative to the first chamber.
