Patent ID: 7232160

Claim:
In a pipe clamp or coupling for pipe repair or for sealing relationship of two pipes by means of a metal clamping band to surround at least one of said pipes, and a flexible inner sleeve disposed inside said clamping band, said flexible inner sleeve carries an array of depressions over most of its inner face, the improvement comprising a reinforcing material embedded within said inner sleeve, fibers of said reinforcing material are parallel to axis of said pipe clamp or coupling to inhibit axial expansion of said inner sleeve when said inner sleeve is under compression between said at least one of said pipes and said clamping band, wherein said flexible inner sleeve is provided with sealing lips protruding from said inner face and integral to said flexible inner sleeve on its inner face to contact said at least one of said pipes, said sealing lips are made to form circumferential sealing ring around said at least one of said pipes, and wherein said sealing lips are formed with edges which bent down and sideward when in contact with said at least one of said pipes to increase sealing of said sealing lips when liquid fills depressions on the sides of said sealing lips.