Hose coupling gasket

Claim 1

In a hose coupling for a railway car air line having a gasket retaining groove formed coaxially with, and opening into the coupling air passage at a location adjacent the mouth of said coupling, said groove having at least one curvilinear surface including a fixed gage point at which the axial dimension of said groove is measured for accuracy, there is provided a one-piece, annular, resilient elastomeric gasket comprising: (a) an annular body having an opening therethrough coaxial with said air passage; (b) an annular flange extending radially from one axial end of said body, said flange being contained in said retaining groove to secure said gasket at the mouth of said air passage; (c) an annular sealing face at the opposite axial end of said body adapted to sealingly engage the counterpart sealing face of an adjoining hose coupling; (d) a first annular sealing bead formed on the side of said flange adjoining said curvilinear surface of said retaining groove, said first sealing bead engaging said retaining groove approximate the opening thereof into said air passage when said flange is properly contained in said retaining groove; and (e) a second annular sealing bead formed on the side of said flange, on which said first sealing bead is formed, said second sealing bead having a diameter of 1.499 in. corresponding to the radial diameter of said groove at said gage point.