Patent ID: 7681897

Claim:
A wheel suspension comprising: a working cylinder; a main spring in parallel with the working cylinder; a piston rod extending from the working cylinder and being movable into and out of the working cylinder, the piston rod having a longitudinal axis, the piston rod having fixed thereto a piston and a mount for fixing the piston rod against movement with respect to a vehicle body; an adjusting cylinder in which the piston is mounted with freedom of axial movement, the adjusting cylinder being movable with respect to the working cylinder, the piston dividing the adjusting cylinder into a space above the piston and a space below the piston; an additional spring located on said longitudinal axis for supporting said adjusting cylinder against said working cylinder; a flow connection connecting the space above the piston to the space below the piston; and a shut-off element provided in the flow connection, the shut-off element being movable between an open position, wherein the piston can move with respect to the adjusting cylinder, and a closed position, wherein the piston essentially cannot move with respect to the adjusting cylinder.