초록 ▼

An extruded metal pipe coupling for coupling end-to-end aligned pipes comprises a main body forming a coupling band terminating in opposed connecting flanges directed radially outwardly of the main body. Fasteneras pass through apertures in the connecting flanges and are tightened to draw the connec

An extruded metal pipe coupling for coupling end-to-end aligned pipes comprises a main body forming a coupling band terminating in opposed connecting flanges directed radially outwardly of the main body. Fasteneras pass through apertures in the connecting flanges and are tightened to draw the connecting flanges together. The free edges of the connecting flanges have abutment surfaces which abut each other upon tightening of the fasteners to provide a fulcrum about which continued tightening is effective to impart increased tensioning to the main body. The abutment surfaces roll or slide with respect to one another. The coupling is useful in conjunction with other elements for imparting leak resistance to the coupling joint.

대표청구항 ▼

In a pipe coupling of the type comprising a main body portion having a circumferential extent slightly less than a full 360°and circumferentially terminating in juxtaposed connecting flanges directed radially outwardly from the main body portion and tightenable fastening means operable to exert forc

In a pipe coupling of the type comprising a main body portion having a circumferential extent slightly less than a full 360°and circumferentially terminating in juxtaposed connecting flanges directed radially outwardly from the main body portion and tightenable fastening means operable to exert forces on the connecting flanges at a location spaced radially outwardly of the main body portion in a direction urging the connecting flanges toward each other to impart circumferential tension to the main body portion, and wherein the coupling is yieldable upon tightening of the fastening means such that at least one connecting flange tends to tip toward the other rather than to impart increased circumferential tension to the main body portion, said connecting flanges further including abutment surfaces spaced radially outwardly of the location at which the forces of the fastening means are exerted on the connecting flanges, said abutment surfaces being disposed to abut each other and thereby counteract the yielding of the coupling by providing a fulcrum about which continued tightening of said fastening means is effective to impart to the main body portion a substantial increase in circumferential tension over that existing just before abutment of the abutment surfaces, the improvement wherein the coupling comprises a unitary extruded metal element having a main body portion, rigid connecting flanges, said flanges being thicker than said main body portion, and abutment surfaces projecting from said flanges as integral portions of the extrusion and wherein one of said abutment surfaces presents, when viewed axially of the coupling, a convex shape to the opposite abutment surface, the opposite abutment surface providing a bearing surface of radial extent greater than the thickness of the main body portion coacting with the convex surface so as to allow said convex abutment surface to roll on the opposite abutment surface as the fastening means is increasingly tightened.