Patent ID: 7712298

Claim:
A chain plate structure, comprising: a first outer link plate having a first through hole, a first connection hole, a first trough and a first engaging trough on opposite sides of the first connection hole, the first trough being disposed close to the first through hole and the first engaging trough being disposed away from the first through hole, a first rib extending from an inner periphery of the first engaging trough and at least one first protrusion extending from the first rib, a first pin being fixedly connected in the first through hole, the first pin including a first head at an end thereof and a first neck adjacent to the first head, and a second outer link plate having the same shape as the first outer link plate and having a second through hole, a second connection hole, a second trough and a second engaging trough on opposite sides of the second connection hole, the second trough being disposed close to the second through hole and the second engaging trough being disposed away from the second through hole, a second rib extending from an inner periphery of the second engaging trough and at least one second protrusion extending from the second rib, a second pin being fixedly connected in the second through hole, the second pin including a second head at an end thereof and a second neck adjacent to the second head.