Flexible pipe coupling

A flexible pipe coupling comprising;

• a large diameter cylindrical hollow body, a pair of small diameter cylindrical hollow bodies each having one end portion disposed inside each end of said large diameter cylindrical hollow body on the same axial line, and means connecting each end of said large diameter cylindrical hollow body to one end of each of said small diameter cylindrical hollow bodies, said means including an elastic sleeve member positioned substantially at each end of said large diameter cylindrical hollow body, each of said elastic sleeve members having two ends and a radial thickness and being provided at its both ends adjacent to said large and small diameter cylindrical hollow bodies with protrusions each extending axially outwardly from said ends in the widthwise direction of said sleeve member at a radius of curvature corresponding to 0.1.about.0.4 times the radial thickness of said sleeve member, and said sleeve member having a straight portion between said protrusions corresponding to 0.2.about.0.8 of its radial thickness.