Railroad car shock absorber

Claim 1

A SINGLE-ACTING, HYDRAULIC, SHOCK ABSORBING MECHANISM COMPRISING: A CYLINDER, A CYLINDER HEAD CLOSING ONE END OF SAID CYLINDER, A PISTON SLIDABLE IN SAID CYLINDER, PORT MEANS EXTENDING LONGITUDINALLY THROUGH SAID PISTON, CHECK VALVE MEANS FOR SAID PORT MEANS, SAID CHECK VALVE MEANS OPENING TOWARD SAID CYLINDER HEAD, METERING PORT MEANS FOR ALLOWING FLUID TO PASS THROUGH SAID PISTON WHEN SAID CHECK VALVE MEANS IS CLOSED, A HOLLOW PISTON SHAFT CARRIED BY SAID PISTON AND EXTENDING AWAY FROM SAID CYLINDER HEAD, AND ANNULAR PISTON SLIDABLY MOUNTED ON SAID PISTON SHAFT AND SLIDABLE IN SAID CYLINDER, SECOND PORT MEANS EXTENDING LONGITUDINALLY THROUGH THE LATTER SAID ANNULAR PISTON, SECOND CHECK VALVE MEANS FOR SAID SECOND PORT MEANS, SAID SECOND CHECK VALVE MEANS OPENING TOWARD SAID FIRSTMENTIONED PISTON, AND RESILIENT MEANS BIASING SAID FIRSTMENTIONED PISTON AWAY FORM SAID CYLINDER HEAD, SAID RESILIENT MEANS COMPRISING A COIL COMPRESSION SPRING MOUNTED WITHIN THE HOLLOW PISTON SHAFT, THE SPRING HAVING ONE END ENGAGING AN ELEMENT ON THE PISTON SHAFT, THE OTHER END ENGAGING SAID CYLINDER HEAD.