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: 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.

Abstract: An arrangement in a liquid treatment space clarifying liquid by gravity. A feed assembly leads the liquid to be treated into the treatment space by a fixed distribution channel. The feed assembly includes at least two elongated and in a longitudinal direction thereof straight feed channels being fixed stationary in the distribution channel and extending therefrom sidewards, in order to achieve in the treatment space a radially widened feed zone in respect with the distribution channel by an efflux assembly provided with the feed channels the efflux assembly discharging the liquid to be treated into the treatment space through full length thereof.

Abstract: A method and exhaust arrangement in the removal of surface scum. An exhaust arrangement is used existing in connection with a liquid basin. The exhaust arrangement includes a first surface chute arrangement for removal of surface scum utilizing an overflow arrangement, belonging to the first chute arrangement and being based on a continuous flow for overflowing the surface scum in at least two successive phases, from the fluid basin into a primary space in the fluid basin and from the primary space into a secondary space in the fluid basin, from where overflow is finally exhausted from the liquid basin utilizing an exhaust assembly for the surface scum. A second surface chute arrangement removes liquid processed in the liquid basin.

Abstract: An arrangement in a liquid treatment space clarifying liquid by gravity. A feed assembly leads the liquid to be treated into the treatment space by a fixed distribution channel. The feed assembly includes at least two elongated and in a longitudinal direction thereof straight feed channels being fixed stationary in the distribution channel and extending therefrom sidewards, in order to achieve in the treatment space a radially widened feed zone in respect with the distribution channel by an efflux assembly provided with the feed channels the efflux assembly discharging the liquid to be treated into the treatment space through full length thereof.

Abstract: A method and exhaust arrangement in the removal of surface scum. An exhaust arrangement is used existing in connection with a liquid basin. The exhaust arrangement includes a first surface chute arrangement for removal of surface scum utilizing an overflow arrangement, belonging to the first chute arrangement and being based on a continuous flow for overflowing the surface scum in at least two successive phases, from the fluid basin into a primary space in the fluid basin and from the primary space into a secondary space in the fluid basin, from where overflow is finally exhausted from the liquid basin utilizing an exhaust assembly for the surface scum. A second surface chute arrangement removes liquid processed in the liquid basin.

Abstract: A method for removal of surface scum in an apparatus, which includes at least a first surface chute arrangement that exists in a liquid basin and which is meant for removal of surface scum. Surface scum is exhausted by an overflow arrangement belonging to the first surface chute arrangement and being based on a continuous flow, with which surface scum is overflown in at least two successive phases. Also an arrangement for removal of surface scum operating according to the method.

Abstract: The invention relates to a scraper, which comprises an elongated, at least tension transmitting flexible structure, which is formed of formed pieces (X), being coupled with each other one after the other in a longitudinal direction (s) and that are arranged to twist (w1) in respect with each other round an axis standing in a direction of height (h) by means of a joint arrangement (N), whereby the joint arrangement (N) comprises edge projections (N1), existing in a preceding formed piece one below the other in the direction of height (h) of the formed piece, and a cental projection (N2) existing in the following formed piece and that is to be placed between the above edge projections. A joint arrangement (N; N?) is arranged to enable twisting (w2) of the successive formed pieces (X) in respect with each other round an essentially longitudinal axis (s).

Abstract: The invention relates to an auxiliary scraper arrangement, intended particularly for enhancing a scraping process performed by a scraper bar assembly in a liquid tank, such as a settling tank or the like. The auxiliary scraper arrangement (X) comprises one or more extensions (X1), driven in response to actuators (X2) to two or more working positions (I, II) different from each other relative to the scraping bar (1) during its movement in the liquid tank. In the first working position, the extension (X1) is intended for scraping the supernatant sludge present on the wall of the tank, while the scraper bar (1) is at the liquid surface. In the second position, the extension is intended for scraping the sludge present on an inclined surface (VP) at the bottom of the tank while the scraper is upside down at the bottom of the tank.

Abstract: The invention relates to a scraper bar apparatus that is intended for scraping of material, which exists in a fluid basin (N), to an exhaust arrangement (2), such as one or more surface chutes (2a), bottom chutes (2b) or like that exists in connection with the fluid basin, by means of a scraper bar arrangement (1), which moves in the liquid basin.

Abstract: Method for chain drive, whereby the chain, such as a transmission chain, conveyor chain and/or like, is formed of several shaped pieces (1), that are connected to each other one after another at jointing points (N) by means of joint pins, and that is being driven by means of a wheel arrangement, that includes at least one chain wheel (7), such as a drive wheel, a turning wheel or the like. Particularly wearing of the chain, that is due to bending of the chain essentially along the longitudinal direction (p) of the joint pins, is being minimized by taking advantage of joint pins (x), the cross section of which changes in the longitudinal direction (p). The invention also relates to chain functioning according to the method.

Abstract: Scraper bar arrangement to be used particularly in connection with a liquid handling reservoir, such as a clarification basin or like, which comprises one or several scraper bars (1) being placed one after another in the longitudinal direction (5), transfering means (2) for moving of the scraper bar/bars (1), such as two transmission chains (2b) or like being placed side by side and being driven by means of a drive wheel and turning wheel arrangement (2a) or accordingly, in connection with which the scraper bar/bars (1) is/are attached by means of an attachment arrangement (3), preferably removably, such as by a screw joint or like. The scraper bar (1) is formed known as such of at least two first bar parts (1a), that are fixed to the transfering means (2), such as to two transmission chains (2b) placed side by side, and of at least one second bar part (1b), that has been attached between the above by means of coupling means (4), that operate preferably by quicklocking principle, and locking means (5).

Abstract: The invention relates to chain structure comprising several form pieces (1) and a wheel arrangement comprising at least one drive wheel (7) for transferring the chain, which is formed of said form pieces (1). The bearing surface (1B) of each form piece (1) consists of at least one transverse opening (2) which is arranged to be situated near one of the articulations (4, 5), which opening consists of the contact edge, the bottom and the back edge. When the chain is in mesh said openings (2) of the chain co-operate with the transverse joint pins (9) belonging to said drive wheels (7). The free length of the joint pins (9) essentially correspond to the width of the form pieces (1), whereupon the contact area formed during the contact situation in said mesh of said pins (9) and the openings (2) essentially corresponds in length to the width of the form pieces (1). After said contact situation said pin (9) leaves the opening (2) of the chain from that end thereof which is on the side of the trailing edge.