Abstract: A piece of chain for use in a metal-constructed chain is 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. The chain is operated by a drive assembly 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. The piece of chain includes a back or edge member connecting its opposite side plates, and a supplementary arrangement coupled in connection therewith.

Abstract: A method and apparatus for the removal of surface scum by using an apparatus in connection with a liquid tank, including a collecting arrangement for gathering surface scum and removing the same from the liquid tank with a surface scum discharge arrangement, and an overflow arrangement based on continuous flow for separating liquid to be treated from surface scum and for removing purified liquid from the liquid tank. The presently treated liquid is overflowed from the liquid tank into a escort water collecting space included therein by way of which it is removed from the immediate vicinity of the liquid tank. The surface scum is removed with a separating arrangement by which the surface scum is first of all separated from liquid to be treated in the liquid tank below its supernatant layer of surface scum while being flowed into the escort water collecting space and is conveyed at the same time into a collecting space of the collecting arrangement.

Abstract: A method and apparatus for the removal of surface scum by using an apparatus in connection with a liquid tank, including a collecting arrangement for gathering surface scum and removing the same from the liquid tank with a surface scum discharge arrangement, and an overflow arrangement based on continuous flow for separating liquid to be treated from surface scum and for removing purified liquid from the liquid tank. The presently treated liquid is overflowed from the liquid tank into a escort water collecting space included therein by way of which it is removed from the immediate vicinity of the liquid tank. The surface scum is removed with a separating arrangement by which the surface scum is first of all separated from liquid to be treated in the liquid tank below its supernatant layer of surface scum while being flowed into the escort water collecting space and is conveyed at the same time into a collecting space of the collecting arrangement.

Abstract: A piece of chain for use in a metal-constructed chain is 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. The chain is operated by a drive assembly 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. The piece of chain includes a back or edge member connecting its opposite side plates, and a supplementary arrangement coupled in connection therewith.

Abstract: An apparatus for use of a chain. The chain is formed of: shaped pieces, to be connected to each other at jointing points in jointing parts, arranged at opposite ends of the shaped pieces, utilizing joint pins. A first jointing point of the jointing parts is arranged as a uniform projection assembly that is narrower than the width of a center part of the shaped piece. A second jointing point as a fork assembly. Each of the jointing points has a hole in order to form a uniform chain by placing the projection assembly of a previous shaped piece between the fork assembly of a following shaped piece and by placing a joint pin in the hole; and a drive arrangement including at least one chain wheel.

Abstract: The invention relates first of all to a method for removal of clarified liquid from a liquid basin (N), such as a clarification basin or like, with an apparatus, by means of which clarified liquid is being removed by using a liquid exhaust arrangement (2) and a collecting arrangement coupled therewith. The liquid exhaust arrangement comprises one or more exhaust passages (2a1), existing beneath surface (y) of the liquid basin one after another in longitudinal direction (s) of the liquid basin and comprising a profile with an essentially closed cross section, such as a pipe, channel or like, each passage having a perforation (R) to make possible flow of liquid inside the same.

Abstract: A method and apparatus for use of chain. The chain is formed of shaped pieces connected to each other one after another at jointing points in jointing parts existing at opposite ends thereof by joint pins. The chain is driven by a drive arrangement that includes at least one chain wheel. A deviation of a center line(s) defined by the chain's successive joint pins from a curvature of the drive wheels and/or the turning wheels supporting surface when the chain gets bent over the drive wheel and/or the turning wheel is minimized by using shaped pieces that have jointing parts that exist at a deviating angle with respect to the center line(s) thereof.