Patent ID: 6196381
Filing Date: 2001-03-06
Classification: B65G

Abstract:
A chain unit comprising a central rib extending transversely from one end to an opposite end, an equal and even number of protruding portions extending perpendicularly to the rib on a front side and an opposite rear side, said protruding portions each having an equal width and being staggered along the rib, all protruding portions and interval spaces therebetween having substantially one equal width, being characterized by:the central rib extending from a top surface down to a bottom surface of the chain unit;the protruding portion being defined by a pair of vertical side walls, each wall comprising an individual projection, joined at a closed end portion, said pair of vertical side walls extending perpendicularly to and integrally from the rib along the full height of the rib in parallel to each other, said closed end portion being formed between the ends of the side walls and having an opening transversely for a connecting rod passing therethrough for connecting chain units arranged in an adjacent row and in column;at least two closed end portions on the front and rear side, each being cylindrical shaped, so as to surround the opening of the cylindrical surface of the two closed end portions being brought into contact with a tooth of the sprocket entered between the side walls of the protruding portion, and at least two corresponding recesses to the cylindrical end portions, and a recess in the lower surface of the rib for providing enough space to accept the tooth of the sprocket between the side walls therethrough, and;the bottom of the chain unit having a circular arc surface extending from the rib toward the front and rear sides of the protruding portions and a flat surface at both ends of the protruding portions such that the circular arc surface is in surface contact with an end bar having a predetermined radial curvature corresponding to the radius of a six teeth sprocket.