Patent ID: 7874254

Claim:
A device for the secondary suspension of a car body in a rail vehicle, having a spring element between the car body and a bogie which ensures at least a raised travel level for the car body while the rail vehicle is traveling, wherein the spring element can be compressed by a traction cylinder having a piston when the rail vehicle is stationary, in order to set a lowered railway platform level, below the raised travel level, for the car body, wherein the traction cylinder includes means for mechanically decoupling the downward movement of the car body from the piston such that the piston does not move in response to the downward movement, wherein the means includes a piston rod in the traction cylinder, and the mechanical decoupling is effected by decoupling of the force in the piston rod from the traction cylinder, and wherein the piston rod is a collared piston rod and wherein the means for mechanical decoupling includes a pot-shaped piston unit which forms the piston with a piston rod portion and which penetrates the cylinder casing in a sealed fashion, the piston unit having, at the bottom, a passthrough for the collared piston rod so that the piston unit remains in the current position during the downward movement of the collared piston rod.