Deformable pipe coupling having multiple radii of curvature

A pipe coupling assembly for securing pipe elements together in end-to-end relationship, said ends of said pipe elements having an outer surface of substantially cylindrical profile, said coupling assembly comprising:

• a plurality of coupling segments connected in end-to-end relationship and positionable straddling facing ends of a pair of said pipe elements, each said coupling segment comprising:
• a unitary body comprising a plurality of sub-sections positioned end-to-end and defining a circumferential direction, said unitary body further comprising connection members positioned at opposite ends of said unitary bodies for adjustably connecting said unitary bodies to one another;
• each said sub-section having a surface region of a different radius of curvature from said surface region on an adjacent sub-section, wherein the curvature of said surface regions extends in said circumferential direction;
• and
• said connection members being adjustably tightenable for drawing said unitary bodies toward one another, said unitary bodies being deformable upon adjustable tightening of at least one of said connection members so as to engage said surface regions with the outer surfaces of said pipe elements at a first contact point located about midway between said opposite ends of said unitary bodies, and at second and third contact points located at said opposite ends of said unitary bodies.