Patent ID: 7641578

Claim:
A double face driving chain having a first lateral side, a second lateral side, a first driving link side facing in a first direction and a second driving link side facing in a second direction, said double face driving chain comprising: a plurality of first link plates and a plurality of second link plates alternately connected by pins, each of said first link plates including a set of first teeth, and each of said second link plates including a set of second teeth, said first link plates and said second link plates being disposed on the first lateral side; a plurality of third link plates and a plurality of fourth link plates alternately connected by said pins, each of said third link plates including a set of third teeth and each of said fourth link plates including a set of fourth teeth, said third link plates and said fourth link plates being disposed on the second lateral side, said first, second, third and fourth link plates being constructed and arranged to form a first driving link train, such that each set of said first, second, third and fourth teeth are disposed on said first driving link side; and a plurality of fifth link plates positioned between said second link plates and said fourth link plates and having a set of fifth teeth, said fifth link plates being constructed and arranged to form a second driving link train, such that each set of said fifth teeth are disposed on said second driving link side; wherein, each pin of said pins passes through at least one of each of said first, second, third, fourth and fifth link plates, and, for each said pin, a distance from a center of said pin to an edge of said first, second, third and fourth teeth of said at least one of each of said first, second, third and fourth link plates through which said pin passes is equal to or greater than a distance from the center of said pin to a back face of said at least one of said fifth link plates through which said pin passes; and wherein, for each said pin, a distance from the center of said pin to a back face of each of said at least one of said second and fourth link plates through which said pin passes is greater than a distance from the center of said pin to an edge of said fifth teeth of said at least one of said fifth link plates through which said pin passes.