Piece of chain

A piece of chain for use in a metal-constructed chain, such as a power transmission, conveyor chain and/or the like, the chain being composed of pieces of chain made up of lengthwise parallel side plates and connectible successively to each other by link pins at pivot points included in linking portions present at what are the opposite ends in its longitudinal direction, whereby the first pivot point established by the linking portions of the side plates of pieces of chain is a protrusion structure, and the second pivot point is a yoke structure external with respect to the protrusion structure when viewed in a transverse direction, each pivot point having a hole for constructing a continuous chain by placing the protrusion structure of a preceding piece of chain into engagement with the yoke structure of a following piece of chain with a lap joint and by placing a link pin in the hole, and the chain being intended to be operated by a drive assembly which includes at least one sprocket such as a drive, deflection pulley or the like, whereby in association with a bearing surface, present in a midsection of the chain-constructing piece of chain, is provided a notch substantially transverse relative to the chain traveling direction and including a recess comprising a leading edge and a trailing edge, and being, when the chain is being driven, in cooperation with substantially transverse mating surfaces included in the sprocket consistently with the successive notches of the chain, and wherein the piece of chain includes a supplementary arrangement for improving wear resistance of a chain drive, implemented with a chain composed of the pieces of chain, by reducing friction and/or surface pressure between the piece of chain and mating surfaces of the sprocket by means of an expanded contact surface, included at the notch and expanded in a direction substantially perpendicular to the chain piece, wherein the piece of chain comprises sheet metal-constructed side plates that make up an integral construction by way of a back member connecting the same on a side opposite to the bearing surface of the piece of chain and/or by way of an edge member connecting the linking portions of one end thereof, and that the supplementary arrangement is arranged in association with its opposite side plates by means of an expanded contact surface, included in the opposite side plates at the notch and expanded in a direction substantially perpendicular to the side plates, and/or by means of one or more rotatable rollers present in association with a leading edge of the notch in the piece of chain and/or in association with the piece of chain's bearing surface, wherein the one or more rollers are substantially equal in width to an interval transverse between the piece of chain's side plates, rotatable around the longitudinal axes thereof, and extending to engagement with the top edge of a substantially respective part of the side plates.