초록 ▼

When first and second coupling pieces are tightened in the axial direction thereof by turning a screw member, the second coupling piece is prevented from being turned together with the screw member, thereby enhancing sealing property, cleanliness and workability. A thrust bearing is interposed betwe

When first and second coupling pieces are tightened in the axial direction thereof by turning a screw member, the second coupling piece is prevented from being turned together with the screw member, thereby enhancing sealing property, cleanliness and workability. A thrust bearing is interposed between a pressing surface of the screw member and the second coupling piece.

대표청구항 ▼

[ What is claimed is:] [1.] A coupling defining a longitudinal axis, said coupling comprising:a first coupling member having a central bore, a threaded portion and an opening communicating with said bore, said opening being defined at least in part by an inner annular wall surrounding the axis and f

[ What is claimed is:] [1.] A coupling defining a longitudinal axis, said coupling comprising:a first coupling member having a central bore, a threaded portion and an opening communicating with said bore, said opening being defined at least in part by an inner annular wall surrounding the axis and forming a frustoconical female sealing surface;a second coupling member fixed to a pipe member at a terminal end thereof and extending into said opening, said second coupling member having a central bore coaxial with said bore of said first coupling member and defining a frustoconical male sealing surface, and a shoulder extending transversely relative to the axis;an annular member disposed in surrounding and relatively rotatable relation with said second coupling member and having a threaded part threadingly engaged with said threaded portion of said first coupling member, and an end face extending transversely relative to the axis and disposed opposite said shoulder;an elastomeric ring-shaped member mounted on one of said sealing surfaces for contact with the other said sealing surface to prevent abrasion of said sealing surfaces; andan antifriction thrust bearing disposed between and contacting said shoulder and said end face, said annular member being rotatable to transmit an axially-directed force to said shoulder of said second coupling member via said antifriction thrust bearing to sealingly engage said male sealing surface with said female sealing surface and create a hermetic seal between said first and second coupling members, said antifriction thrust bearing permitting said second coupling member to remain non-rotatable relative to said first coupling member during rotation of said annular member.