Cup structure for air line lubricator or the like

Claim 1

CUP STRUCTURE FOR AN AIR LINE ACCESSORY SUCH AS A LUBRICATOR COMPRISING, TWO CUPS, ONE NESTED WITHIN THE OTHER, THE INNER CUP BEING FORMED OF A RELATIVELY TOUGH, FLEXIBLE, FLUIDIMPERVIOUS PLASTIC MATERIAL, SAID MATERIAL BEING SO THIN THAT OF ITSELF IT IS INCAPABLE OF CONTAINING AIR UNDER LINE PRESSURE, AND UNDER THE INFLUENCE OF SAID PRESSURE EXPANDS AGAINST THE OUTER CUP, SAID OUTER CUP BEING FORMED OF A RELATIVELY THIN MATERIAL AND PROVIDING EXTERNAL SUPPORT FOR SAID INNER CUP, SAID CUPS TOGETHER HAVING STRENGTH ADEQUATE TO CONTAIN AIR UNDER LINE PRESSURE IN SAID INNER CUP, SAID CUPS HAVING ALIGNED WALL OPENINGS, A PETCOCK FITTING SECURED WITHIN THE WALL OPENING OF SAID OUTER CUP, SAID FITTING HAVING A PASSAGEWAY COMMUNICATING WITH THE INTERIOR OF THE INNER CUP AND BEING CLOSE BY A PETCOCK MEMBER, MEANS PROVIDING A SEAL DISPOSED BETWEEN PORTIONS OF SAID FITTING AND PORTIONS OF SAID INNER CUP FOR CONTAINING FLUID UNDER PRESSURE IN SAID INNER CUP, SAID OUTER CUP HAVING MEANS ADAPTED TO BE DETACHABLY SECURED TO THE HEAD OF AN AIR LINE ACCESSORY, SAID INNER CUP HAVING MEANS ADAPTED TO BE DISPOSED IN SEALING RELATION TO THE HEAD OF AN ACCESSORY TO WHICH SAID OUTER CUP IS ADAPTED TO BE SECURED, SAID OUTER CUP HAVING AROUND ITS PERIPHERY ALTERNATELY ARRANGED RIBS AND ELONGATE OPENINGS WHICH EXTEND DIMENSIONED SO THAT SAID MATERIAL OF SAID INNER CUP IS OF ITSELF CAPABLE OF CONTAINING FLUID UNDER LINE PRESSURE IN THE SPANS OF SAID OPENINGS.