Single tube type shock absorbers

Claim 1

A SHOCK ABSORBER COMPRISING A TUBE DEFINING A WORKING CHAMBER, A PISTON MOUNTED IN SAID TUBE FOR AXIAL MOVEMENT AGAINST THE RESISTANCE OF FLUID FILLING THE WORKING CHAMBER, A PISTON ROD EXTENDING FROM THE PISTON AND PROJECTING THROUGH ONE END OF SAID TUBE FOR CONNECTION TO A FIRST MOVING PART, A FOOT VALVE CLOSING THE OTHER END OF SAID TUBE TO CONTROL FLOW OF FLUID DISPLACED FROM THE WORKING CHAMBER BY THE PISTON ROD, A SECOND TUBE SECURED TO THE EXTERIOR OF THE FIRST TUBE TO PROJECT BEYOND THE FOOT VALVE END OF THE FIRST TUBE AND TO DEFINE A RECUPERATION CHAMBER INCLUDING AN ANNULAR GAP BETWEEN THE CYLINDRICAL WALLS OF THE TUBES, A FLEXIBLE ELASTIC SACK HAVING A SKIRT DISPOSED IN SAID GAP TO ENCLOSE A SPACE ON THE OPPOSITE SIDE OF THE FOOT VALVE TO SAID WORKING CHAMBER TO RECEIVE SAID DISPLACED FLUID, A CAP SECURED TO THE FREE END OF THE SECND TUBE AND ADAPTED FOR CONNECTION TO A SECOND MOVING PART AND A SLEEVE HAVING ONE END SERVING TO WEDGE THE RIM OF THE SACK BETWEEN SAID TUBE WALLS WITH THE OTHER END OF THE SLEEVE ABUTTING SAID CAP.