Recoil suppressing hydraulic damper for a train coupler

A damper for a train coupler arranged for shock absorption in both compression and expansion, the damper comprising:

• a cylindrical housing wherein a hollow piston is received axially movable,
• a hydraulic working chamber of variable volume in the housing
• a hydraulic overflow chamber of variable volume in the piston,
• a spring means confined in a chamber of variable volume in the piston,
• a throttling means in a flow passage between the working chamber and the overflow chamber in the form of a flow restriction) that varies with the position of the piston relative to the housing,
• a hydraulic balancing chamber of variable volume formed in an annular space between the piston and the housing,
• a slip-ring carried on a piston head in an inner end of the piston, the slip-ring journaling the piston in the housing and separating the balancing chamber from the working chamber,
• at least one inlet bore through the slip-ring permitting direct flow from the working chamber to the balancing chamber in compression of the damper,
• at least one outlet bore providing restricted flow through the slip-ring from the balancing chamber to the working chamber in expansion of the damper, and
• a buffer chamber formed in the annular space between the piston and the housing in axial alignment with the balancing chamber, separated from the balancing chamber through a sealing ring, wherein in the buffer chamber a thrust collar is positioned on the piston to transmit to the housing the force that is applied to the damper in draft.