Abstract: A chain unit has a central rib extending transversely and protruding portions extending from the rib to the front and rear side alternatively. The protruding portion is defined by two vertical side walls extending from the rib with the same height and a closed end portion combining the end portions of side walls. The closed end portion has an opening so as to enable the chain units to be placed in a row and column by being coupled with a connecting rod. At least two connected end portions are cylindrical shaped so as to surround the opening, and the cylindrical surface of the two closed end portions engages with a tooth of the sprocket which enters between the side walls. At least two corresponding recesses are formed in the lower surface of the rib for providing enough space to accept the tooth of the sprocket. The bottom of the chain unit has a circular arc surface extending from the rib towards the front and rear sides.

Abstract: A conveyor chain unit possessing a central straight rib extending longitudinally from one end of the unit to the other end. The rib has a vertical height extending from the conveying surface to the bottom surface of the unit. A plurality of pairs of vertical side walls extend from the rib perpendicular to through-holes to form projections. The projections are positioned alternately on opposite sides of the rib having equal interval spacing. The number of the projections on one side is even and identical to the projections on the opposite side. At least one pair of projections positioned on opposite sides of the rib have recesses that are formed at the rib, and the projections are connected along the full height of the rib and spaced in a manner that chain units may be coupled together interchangeably via projections on either side of the rib.

Abstract: To provide a roller chain according to the present device pertaining to a bushed chain with an oil-impregnated sintered bushing fitted on a roller, which has an improved roller retaining power required during the sliding of the roller chain, and further requires no installation time and labor at the time of unlinking and linking of the roller chain, thereby preventing impairing or breaking each member. Pin diameter is increased to lower a bearing surface pressure to thereby improve wear resistance. Furthermore, the thickness of the sintered bushing axially supported on a pin is made nearly equal to that of the roller. According to the present device, the chain provided is a bushed chain with an oil-impregnated sintered bushing fitted on a roller, in which the working accuracy of the punched surface of a link plate has been improved, requiring no staking of a pin end face after installation.