Patent ID: 8341931
Filing Date: 2013-01-01
Classification: B66F,F16G,Y10T

Abstract:
1. A lift-driving engagement chain to be used in a pair in an engagement chain type lift system, the chain having a chain width direction and a chain traveling direction, and each segment of the lift-driving engagement chain comprising: a plurality of inner link units each consisting of a pair of hooked inner tooth plates with two bush press-fitting holes formed and buckling restricting flat surfaces formed therein, where the pair of hooked inner tooth plates are connected and disposed apart in the chain width direction by two bushes press-fitted into the two bush press-fitting holes of the hooked inner tooth plates; and at least two outer link units disposed on the outside of the plurality of inner link units in the chain width direction, each consisting a hooked outer tooth plates with two pin press-fitting holes formed and buckling restricting flat surfaces formed therein, where the at least two outer link units are connected to the plurality of inner link units by press-fitting connecting pins into the pair of pin press-fitting holes, wherein when the bushes are engaged by a pair of lifting sprockets, a segment of each of the pair of lift-driving engagement chains is deflected from a chain dividing direction into a chain vertical engagement direction and the hooked inner and outer tooth plates of the segment of the pair of the lift-driving engagement chains engage each other and are driven so as to lift self-sustainably, wherein when the sprockets are reversely rotated, the engaged hooked inner and outer tooth plates of the segments of the lift-driving engagement chains become disengaged and said chains are deflected and divided from the chain vertical engagement direction into the chain dividing direction, and wherein the buckling restricting flat surfaces of the hooked inner and outer tooth plates, which come into contact when the segments of the lift-driving engagement chain are engaged, comprise a tangential line which extends from a plate arc shoulder portion of the hooked inner and outer tooth plates which has a circumference centered on said bush and pin press-fitting holes.