Patent ID: 6536811
Filing Date: 2003-03-25
Classification: F16L

Abstract:
A pipe coupling comprising:first and second hub sections each having a longitudinal bore extending along a longitudinal axis, an outer terminal end and an inner end having a circumferentially and radially extending clamping portion including a clamping face extending concentric with the bore at an oblique angle between radially inner and outer ends of the clamping face so that the clamping face is inclined towards the inner end of the respective hub section between its radially inner and radially outer ends; at least a pair of clamp elements configured as generally complementary segments each having an annular inner profile concentric with the bore including axially spaced radially inwardly projecting inner clamping surfaces dimensioned and configured to fit closely over and mate with the clamping faces of the first and second hub sections when the inner ends of the first and second hub sections are axially aligned and placed in close proximity to each other, and an outer circumferentially extending peripheral surface portion lying within a first radius of curvature, and a plurality of circumferentially spaced locking surface portions lying outside said first radius of curvature and along a second radius of curvature greater than said first radius of curvature and concentric with said bore; said clamp elements having terminal ends and being dimensioned so said ends are located adjacent each other but not abutting each other when said clamping surfaces of said clamp elements are mated against said clamp faces and the inner ends of the hub sections abut each other; a locking ring having an inner locking surface extending concentric with said bore and having a radius of curvature that is not larger than the radius of curvature of said locking surface portions when said clamp elements are fit over the inner ends of the hub portions with the clamping surfaces and clamp faces in abutting relationship and with said inner ends of said hub sections abutting each other; whereby placement of said clamp elements over the inner ends of the hub sections with the clamp faces in abutting relationship with the clamp surfaces and placement of said inner locking surfaces of said locking ring over the locking surface portions of the clamp elements draws the inner ends of the hub sections in abutting relationship and resists axial separation of said hub sections.