Bottom ring of stuffing boxes for pistons and piston rods of high-pressure engines and the like

Claim 1

IN COMBINATION WITH A CYLINDER MEMBER DEFINING A PRESSURE SPACE ADAPTED TO BE FILLED WITH PRESSURE FLUID AND ANOTHER MEMBER COOPERATING WITH SAID CYLINDER MEMBER AND ARRANGED COAXIALLY THEREWITH AND MOVABLE RELATIVE THERETO, SAID MEMBERS HAVING RESPECTIVELY CYLINDRICAL SURFACES SPACED FROM SAID FACING EACH OTHER, A SEALING ARRANGEMENT FOR PREVENTING PRESSURE FLUID TO PASS THROUGH THE SPACE BETWEEN SAID CYLINDRICAL SURFACES OF SAID MEMBERS AND COMPRISING A FIRST RING COAXIALLY FIXED TO ONE OF SAID MEMBERS AND HAVING A CYLINDRICAL SURFACE FACING AND SPACED FROM THE CYLINDRICAL SURFACE OF THE OTHER MEMBER BY A SMALL CLEARANCE, ONE END FACE FACING SAID PRESSURE SPACE AND AN OPPOSITE END FACE, SAID FIRST RING BEING FORMED WITH A PLURALITY OF AXIAL PASSAGES THERETHROUGH EXTENDING BETWEEN SAID END FACES THEREOF AND COMMUNICATING AT ONE OF THE ENDS THEREOF WITH SAID PRESSURE SPACE; A SECOND RING ABUTTING WITH CYLINDRICAL FACES THEREOF AGAINST SAID CYLINDRICAL SURFACES OF SAID MEMBERS, RESPECTIVELY,AND WITH AN END FACE THEREOF AGGAINST SAID OPPOSITE END FACE OF SAID FIRST RING, SAID RINGS BEING FORMED IN SAID ABUTTING END FACES THEREOF WITH COMPLEMENTARY GROOVES DEFINING A CHANNEL OPEN AT ONE SIDE TOWARD THE CYLINDRICAL SURFACES OF SAID OTHER MEMBER AND COMMUNICATING WITH SAID PASSAGES, SAID SECOND RING HAVING AN INTEGRAL FLEXIBLE LIP EXTENDING BEYOND SAID END FACE THEREOF PARTLY ACROSS SAID OPEN SIDE OF SAID CHANNEL TO DEFINE AT SAID OPEN SIDE OF SAID CHANNEL A NARROW ANNULAR SLOT DIRECTED TOWARD SAID SMALL CLEARANCE SO THAT PRESSURE FLUID MAY PASS THROUGH SAID PASSAGES AND SAID CHANNEL THROUGH SAID SLOT TO COUNTERACT ANY FLOW OF PRESSURE FLUID THROUGH SAID CLEARANCE, WHILE SAID SEALING LIP WILL BE RESILIENTLY PRESSED AGAINST THE CYLINDRICAL SURFACE OF SAID OTHER MEMBER, WHEREBY PASSAGE OF PRESSURE FLUID BEYOND SAID SEALING ARRANGEMENT IS PREVENTED; AND HOLDING MEANS FOR HOLDING SAID SECOND RING IN ABUTTING RELATIONSHIP AGAINST SAID FIRST RING.