Heavy duty buffing device

Claim 1

A HYDRAULIC BUFFER WHICH UNDERGOES LENGTHWISE CONTRACTION IN RESPONSE TO LOADING COMPRISING: (A) A CYLINDER HAVING A HEAD SUBSTANTIALLY ENCLOSING ITS FRONT END, AND AN OPEN REAR END; (B) AN ASSEMBLY COMPRISING: A PISTON RECIPROCABLE IN SAID CYLINDER, AND A PISTON ROD FOR THE PISTON EXTENDING REARWARDLY OF SAID OPEN REAR END OF SAID CYLINDER; (C) A CYLINDER EXTENSION JOINING WITH THE CYLINDER AT SAID OPEN-END AND EXTENDING IN COAXIAL RELATION WITH THE ROD AND THE CYLINDER REARWARDLY FROM THE CYLINDER; (D) SAID ASSEMBLY HAVING AN ELONGATE OPENING CO-EXTENSIVE WITH AT LEAST A PORTION OF SAID EXTENSION; (E) ANNULAR SEALING MEANS DISPOSED BETWEEN THE ROD AND THE INNER SURFACE OF THE EXTENSION CARRIED BY THE ROD LENGTHWISE OF THE EXTENSION IN FIXED LONGIDTUDINAL RELATION WITH THE ROD, SAID MEANS PREVENTING PASSAGE OF FLUID FROM THE SPACE ADJACENT TO THUE FORWARD SIDE OF SAID MEANS TO REGION ADJACENT THE REAR SIDE THEREOF; (F) A RESERVOIR CONNECTED WITH SAID CYLINDER FOR THE TRANSFER OF LIQUID FROM ONE TO THE OTHER; (G) MEANS FOR CONDUCTING LIQUID BETWEEN SAID SPACE AND A LIQUID STORAGE REGION COMPRISING THE CYLINDER AND THE RESERVOIR; (H) SAID ROD HAVING DUCT MEANS EXTENDING FROM AN INTERMEDIATE PORTION OF THE SEALING MEANS SPACED BETWEEN ITS FRONT AND REAR ENDS FOR RECEIVING ANY LIQUID ESCAPING BY THE PORTION OF THE SEALING MEANS FORWARDLY OF THE DUCT MEANS; AND (I) CHECK-VALVE MEANS AND DUCT MEANS OPENING ONLY FOR PASSAGE OF LIQUID FROM SAID SPACE TO SAID OPENING.