Patent ID: 7763336

Claim:
A coupling sleeve for use in a sleeve-type flexible shaft coupling device having two substantially coaxial end pieces, comprising a generally annular body having an inner periphery and an outer periphery; said body comprising a central cylindrical portion and two opposing sleeve end portions at either end of said central cylindrical portion of generally cylindrical shape defining respective coupling receiving portions which coaxially mate in rotational driving relation with said end pieces of the coupling device; said coupling receiving portions each comprising a plurality of circumferentially spaced axially extending teeth arranged along at least a portion of said inner periphery which substantially mesh with complementary grooves in the outer periphery of said end pieces, and characterized in that at least one of said central cylindrical portion and said coupling receiving portions comprises a polyurethane elastomer composition exhibiting thermal stability in the range from about −35° C. to at least about 140° C., and wherein said coupling sleeve possesses an M100 of at least about 1000 psi; and wherein said coupling sleeve has a ratio of outside diameter to shell thickness of from about 8 to about 11.