A thrust chain device that induces an open thrust chain with a thrust portion and a housing portion, a thrust chain guide on a thrust portion of the thrust chain, a driving sprocket provided with teeth interlocking with the thrust chain, and a storage space of the housing portion, is provided. The storage space is parallel to the thrust portion and located opposite the thrust portion, the driving sprocket interlocks bilaterally with the thrust chain in a symmetric manner on the side of the thrust portion and on the side of the housing portion, the chain includes a connection portion between the thrust portion and the housing portion, arranged at a distance from the sprocket, the driving sprocket is in contact with the thrust chain by surfaces in the shape of an involute of a circle, the surfaces belonging to the teeth, where one tooth meshes with the chain while defining a line of action having an angle with the thrust portion between −10° and 10°, and the guide includes contact surfaces in synthetic material.

A thrust chain device that induces an open thrust chain with a thrust portion and a housing portion, a thrust chain guide on a thrust portion of the thrust chain, a driving sprocket provided with teeth interlocking with the thrust chain, and a storage space of the housing portion, is provided. The storage space is parallel to the thrust portion and located opposite the thrust portion, the driving sprocket interlocks bilaterally with the thrust chain in a symmetric manner on the side of the thrust portion and on the side of the housing portion, the chain includes a connection portion between the thrust portion and the housing portion, arranged at a distance from the sprocket, the driving sprocket is in contact with the thrust chain by surfaces in the shape of an involute of a circle, the surfaces belonging to the teeth, where one tooth meshes with the chain while defining a line of action having an angle with the thrust portion between −10° and 10°, and the guide includes contact surfaces in synthetic material.

A curling effect is provided via system, which may be included in an article, via a plurality of links, including distal, proximal, and intermediary links, that each comprise: a base; first and second wings, connected to opposite sides of the base that each first and second through-holes aligned at a first height; and a header, connected between the wings that defines a third through-hole at the first height and a fourth through-hole at a second height different from the first height that is configured at accept a stringer there-through so that a force applied on the stringer in a direction from the distal link towards the proximal link causes rotation of neighboring links relative to one another joined via a linking axel disposed on a shared axis through the first, second, and third through-holes of the neighboring links.

A curling effect is provided via system, which may be included in an article, via a plurality of links, including distal, proximal, and intermediary links, that each comprise: a base; first and second wings, connected to opposite sides of the base that each first and second through-holes aligned at a first height; and a header, connected between the wings that defines a third through-hole at the first height and a fourth through-hole at a second height different from the first height that is configured at accept a stringer there-through so that a force applied on the stringer in a direction from the distal link towards the proximal link causes rotation of neighboring links relative to one another joined via a linking axel disposed on a shared axis through the first, second, and third through-holes of the neighboring links.

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.

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.

A roller chain includes an inner link and an outer link. A bush is projected out of an outer side surface of an inner plate by a predetermined amount and an end surface of a bush being projected is brought into contact with an inner side surface of the outer plate to form a predetermined gap between the outer side surface of the inner plate and the inner side surface of the outer plate. The predetermined gap is within a range of 7 to 18[%] of the distance between the inner side surfaces of the pair of outer plates.

A roller chain includes an inner link and an outer link. A bush is projected out of an outer side surface of an inner plate by a predetermined amount and an end surface of a bush being projected is brought into contact with an inner side surface of the outer plate to form a predetermined gap between the outer side surface of the inner plate and the inner side surface of the outer plate. The predetermined gap is within a range of 7 to 18[%] of the distance between the inner side surfaces of the pair of outer plates.

A pipe chain system has a chain that is made of a plurality of chain links. Each chain link has a body. The body has a male end and a female end such that the male end matingly engages with the female end of an adjacent chain link. The body has an arcuate underside. The arcuate underside corresponds to a portion of a pipe diameter to which the chain is attached. A pin connection is provided for mating each mating engagement of the male end and the female end of the adjacent chain links such that the chain links are hingedly connected to each other.

An energy chain comprising rollers on a number of chain links of the upper strand and/or of the lower strand. The rollers project, at least to a slight extent, beyond narrow sides of the lateral plates in the direction of the respectively opposite strand, in order to allow for rolling action when the energy chain is displaced. The invention provides for the rollers to comprise a wheel body made of plastic and having a hub, a rim and a radial region, which connects the hub and rim. The material thickness of the radial region is reduced in comparison with the rim such that radial impacts during the course of the rolling action can be damped by elastic deformability of the radial region of the roller itself. This significantly reduces the development of noise and vibration caused by rollers located opposite one another coming into contact with one another. The invention also proposes a roller subassembly and/or a chain link made up of two opposite lateral plates with corresponding rollers and, as a further aspect, a special way of fastening the rollers on successive lateral plates.