Railway car draft assembly

Claim 1

IN A RAILWAY CAR: A LONGITUDINALLY EXTENDING HOLLOW CENTER SILL FIXED TO THE CAR; A HOLLOW SLIDING CENTER SILL MEMBER LONGITUDINALLY SLIDABLY MOUNTED IN SAID FIXED CENTER SILL AND EXTENDING SUBSTANTIALLY THE ENTIRE LENGTH OF SAID FIXED CENTER SILL; COOPERATING STOP MEANS CARRIED BY SAID FIXED CENTER SILL AND SAID SLIDING MEMBER PERMITTING LIMITED LONGITUDINAL MOVEMENT OF SAID MEMBER; RESILIENT MEANS BIASING SAID MEMBER TO A NEUTRAL POSITION MIDWAY BETWEEN THE LIMITS OF MOVEMENT OF SAID MEMBER; A DOUBLE-ACTING, HYDRAULIC, PISTTON-AND-CYLINDER BUFFER MECHANISM HAVING A FIRST EXTERNAL COUPLING ELEMENT RIGIDLY CONNECTED TO THE PISTON AND A SECOND EXTERNAL COUPLING ELEMENT RIGIDLY CONNECTED TO THE CYLINDER, SAID BUFFER MECHANISM BEING LONGITUDINALLY DISPOSED WITH SAID SLIDING CENTER SILL MEMBER; A FIRST KEY CONNECTING ONE OF SAID COUPLING ELEMENTS RIGIDLY TO SAID SLIDING MEMBER; A SECOND KEY CONNECTING THE OITHER OF SAID COUPLING ELEMENTS RIGIDLY TO SAID FIXED CENTER SILL, SAID SLIDING MEMBER PROVIDING LONGITUDINAL SLOTS THROUGH WHICH SAID SECOND KEY PASSES FREELY, SAID SLOTS BEING LONGER THAN THE STROKE OF SAID SLIDING MEMBER BETWEEN ITS LIMITS OF MOVEMENT PLUS THE WIDTH OF THE SECOND JEY AND BEING POSITIONED SO THAT THE ENDS OF THE SLOTS CLEAR SAID SECOND KEY AT EACH END OF THE STROKE OF SAID SLIDING MEMBER; AND CAR COUPLERS FIXED TO EACH END OF SAID SLIDING CENTER SILL MEMBER.