Guide bearing for reciprocating structures

Claim 1

IN A SUPPORT FOR RECIPROCATING STRUCTURE: A HOUSING HAVING AN AXIALLY EXTENDING CHAMBER THEREIN, AN ANNULAR CYLINDRICAL MEMBER OF APPRECIABLE LENGTH HAVING A SLIP FIT IN SAID CHAMBER, SAID CYLINDRICAL MEMBER BEING FORMED OF A RIGID NON-PRESSURE DEFORMABLE PLASTIC AND HAVING AN ANNULAR GROOVE IN ITS OUTER SURFACE GENERALLY MIDWAY BETWEEN ITS ENDS, A SEAL IN SAID GROOVE FORMING A SEAL WITH RESPECT TO THE SIDEWALLS OF SAID CHAMBER, SAID CYLINDRICAL MEMBER HAVING A CYLINDRICAL OPENING THERETHROUGH, SAID OPENING HAVING AN ENLARGED SECTION AT ONE END FORMING A SHOULDER IN SAID MEMBER, A CYLINDRICAL ROD EXTENDING THROUGH SAID OPENING AND HAVING A SLIDING FIT THEREWITH, AN ANNULAR U-PACKING SEATED AGAINST SAID SHOULDER FORMED BY SAID ENLARGED SECTION OF SAID OPENING WITH ITS LIPS EXTENDING AXIALLY TOWARD SAID ONE END OF SAID ENLARGED SECTION TO EFFECT A SLIDING SEAL WITH SAID ROD, AN ANNULAR SEAL RETAINER MEMBER POSITIONED AGAINST SAID ONE END OF SAID PLASTIC CYLINDRICAL MEMBER TO CLOSE OFF SAID ENLARGED SECTION AND PROVIDE A PREDETERMINED SPACE FOR SAID U-PACKING, AND ABUTMENT MEANS LOCATING AND AXIALLY HOLDING SAID MEMBERS TOGETHER IN SAID CHAMBER, WHEREBY AN EFFICIENT GUIDING AND SEALING STRUCTURE IS PROVIDED HAVING LOW FRICTION.