Patent ID: 8617017

Claim:
A power transmission chain link comprising a link having a first through hole and a second through hole formed therein and a pillar formed between the first through hole and the second through hole, the pillar comprising a first side portion and a second side portion, the first side portion facing the first through hole and the second side portion facing the second through hole, the pillar comprising: a first concave portion provided on a first side portion of the pillar; a second concave portion provided on the first side portion of the pillar; a third concave portion provided on a second side portion of the pillar; a fourth concave portion provided on the second side portion of the pillar; a first projecting portion provided at a center portion of the pillar, the first projecting portion protruding towards the first through hole and positioned between the first concave portion and the second concave portion with respect to a height direction of the pillar portion; a second projecting portion provided at the center portion of the pillar, the second projecting portion protruding towards the second through hole and positioned between the third concave portion and the fourth concave portion with respect to the height direction of the pillar portion; a first upper flat portion and a first lower flat portion formed, respectively, on a pair of first inclined surfaces which hold an apex portion of the first projecting portion therebetween, the first upper flat portion being formed on an upper surface of the pair of first inclined surface and the first lower flat portion being formed on a lower surface of the pair of first inclined surfaces; and a second upper flat portion and a second lower flat portion formed, respectively, on a pair of second inclined surfaces which hold an apex portion of the second projecting portion therebetween, the second upper flat portion being formed on an upper surface of the pair of second inclined surface and the second lower flat portion being formed on a lower surface of the pair of second inclined surfaces.