Pipe coupling

Claim 1

In a coupling for interconnecting raw ends of rigid incisable piping in axially aligned, flow-through, relation, an annular sleeve having open ends respectively providing snug mating accommodation for the raw piping ends in said axially aligned, flow-through, relation; annular abutment means intermediately disposed on the interior wall of the sleeve for limiting the penetration of said piping ends into said sleeve; an annular trench in the interior wall of at least one of said sleeve ends, spaced from said aboutment means; circumferentially discountinuous annular anchor means installable in said trench having spaced knife edges protruding from said trench; integral annular ribbing on the interior wall of each said open sleeve end and completely embracing the respective piping ends, and a clamp, including a band wrapped around said sleeve operable to releasably clamp and radially constrict the sleeve generally throughout its full length about the raw piping ends accommodated therein; said band having a width approximating the length of the sleeve and hence overlapping the anchoring means and the ribbing in each said sleeve end; said sleeve being essentially rigid to maintain the axial alignment of the piping ends accommodated therein but being slightly compressible under the radially constricting pressure of the clamp to effect gripping and sealing engagement of the ribbing with the piping ends embraced and clamped thereby and to drive the protruding knife edges of the anchor means into incising engagement with the piping to prevent axial withdrawal thereof from the sleeve.