Patent ID: 7530536

Claim:
A clamp having a pair of clamp members which sandwich at least two pipes having cylindrical cross-sections of different diameters, each of the clamp members including an elastic body having at least two concave portions and a reinforcing plate fixed to an outer side surface of the elastic body, the clamp structured to hold the at least two concave portions by aligning the pair of clamp members while the at least two pipes are arranged in the concave portions of the elastic bodies, wherein, when diameters of the at least two pipes are denoted by reference characters D 1 and D 2 , curvature radiuses of the concave portions which hold the first and second pipes are denoted by reference characters R 1 and R 2 , and distances, in a direction orthogonal to mating faces of the elastic bodies through pipe holding centers of the concave portions, from the mating faces of the elastic bodies to inner side surfaces of a pair of reinforcing plates are denoted by reference characters L 11 and L 12 , respectively, for the first pipe, and L 21 and L 22 , respectively, for the second pipe, and the compression ratio of the elastic bodies satisfies the relationship [(D 1 −2R 1 )/(L 11 +L 12 −2R 1 )=(D 2 −2R 2 )/(L 21 +L 22 −2R 2 )].