A traction/compression buffer for coupling devices on rail and wheel-mounted vehicles comprises a housing (1) and a piston element (3), which projects out of said housing on one side and which can be moved out of a zero position in two directions against the resistance of a spring device and a damping...http://www.google.com/patents/US6814348?utm_source=gb-gplus-sharePatent US6814348 - Traction/compression buffer for coupling devices on rail and wheel-mounted vehicles
