Hydraulic shock absorber with compression stop and hydraulic lock

Claim 1

IN A HYDRAULIC SHOCK ABSORBER, THE COMBINATION OF, A PRESSURE CYLINDER, A PISTON RECIPROCABLE IN SAID CYLINDER AND DIVIDING THE SAME INTO A COMPRESSION CHAMBER AND A REBOUND CHAMBER, SAID PISTON BEING CARRIED ON ONE END OF ROD MEANS EXTENDING THROUGH ONE END OF SAID CYLINDER, THE OPPOSITE END OF SAID CYLINDER INCLUDING VALVE MEANS PROVIDING FOR DISCHARGE OF HYDRAULIC FLUID FROM SAID COMPRESSION CHAMBER AND RETURN OF HYDRAULIC FLUID THERETO, SAID PISTON HAVING AN INTERNAL CHAMBER AND INCLUDING PASSAGE MEANS CONNECTING SAID INTERNAL CHAMBER WITH SAID REBOUND CHAMBER AND ADDITIONAL PASSAGE MEANS CONNECTING SAID INTERNAL CHAMBER WITH SAID COMPRESSION CHAMBER, VALVE MEANS IN SAID INTERNAL CHAMBER NORMALLY CLOSING AGAINST FLUID INTERFLOW BETWEEN SAID REBOUND AND COMPRESSION CHAMBERS AND RESPONSIVE TO FLUID PRESSURE IN THE RESPECTIVE REBOUND AND COMPRESSION CHAMBERS TO OPEN FOR FLUID INTERFLOW THEREBETWEEN, AND A SECOND VALVE MEANS IN SAID INTERNAL CHAMBER MOVABLE TO A POSITION TO CLOSE AGAINST FLUID INTERFLOW BETWEEN SAID REBOUND CHAMBER AND SAID INTERNAL CHAMBER, SAID PISTON INCLUDING A THIRD VALVE MEANS MOVABLE TO A POSITION TO CLOSE AGAINST FLUID INTERFLOW BETWEEN SAID COMPRESSION CHAMBER AND SAID INTERNAL CHAMBER.