Patent Description:
A further aspect is a method for producing a strap of this kind.

Such a device for suspending articles is disclosed in the <CIT>. Personal slings are used for lifting persons in a great many situations, for example in hospitals, old people's homes and in home care. The personal sling is put round the person who is to be lifted, as a rule by means of a personal hoist. Then the straps from the personal sling are hung in one or more hooks on the personal hoist, and the person is lifted with the hoist. In this way, transfer of a person who does not have the necessary strength for this can be carried out by a single care-giver.

Persons, surroundings and hoists vary. Therefore the straps of personal slings are as a rule made with several eyes along the strap, so that the sling can be hung in the hoist at various places along the strap. As a result, a sling with the same design and size can be used in many different situations and for persons of various sizes.

With pressure for greater efficiency in the health service, less time is allotted to the care personnel for the individual person. Therefore it is important that the individual tasks can be carried out speedily and effectively. For this purpose straps for personal slings have been developed with colour coding on the straps. Work instructions can then be simplified to for example "use the blue one for lifting persons with the personal sling".

A strap of this kind with two belts, which form a multiple of eyes, where the eyes are marked with an unambiguous colour on one side of the strap, is known from <CIT>.

Firstly, the first belt and the second belt are of different types. This means that the strap is difficult to handle in everyday use, when it has to be fitted on hooks on the hoist.

Secondly, the fact that the first belt and the second belt are different means that the weakest place is in an eye, which limits the carrying capacity. Therefore the carrying capacity of the strap may be limited at the secondary belt, which has lower carrying capacity than the primary belt.

Thirdly, the colour markings are produced with differently coloured weft. This results in a loose texture in the secondary belt to bring out the actual colour of the weft. This means that the tensile strength in the interweaving between the secondary belt and the primary belt is weak and it may open, leading to breakage.

Fourthly, the eyes are only colour-marked on one side of the strap. Therefore the strap has to be turned so this marked side can be seen by the care personnel, before it can be fitted in the hook on the hoist.

Finally, the straps cannot be visually inspected every time, when they are fitted, owing to the single-sided colour marking of the strap.

The aim of the invention is to supply a strap for personal slings, which overcomes these drawbacks.

One aim of the invention is to supply a strap that has a high carrying strength, and where the carrying strength is not limited by a weak link in the strap, and that makes possible an efficient procedure and simple identification of the eye that is to be used or is in use.

A further aim of the invention is to provide a method for producing a strap that overcomes the aforementioned drawbacks.

This is achieved according to the present invention with a strap intended for a sling for persons, of the type mentioned at the outset, which has the distinctive features that it is elongated with short end edges and longer lateral edges and comprises a first belt and a second belt, where each belt comprises an inside and an outside, where the insides are turned towards one another, and the outsides are turned away from one another, where the first belt and the second belt comprise warps and wefts, where the strap has a longitudinal direction that is parallel to the warps, and a transverse direction that is parallel to the wefts, where in the longitudinal direction of the strap there are a number of first sections, where the first belt and the second belt are interwoven, and second sections are provided between them, where the first belt and the second belt are not interwoven, so that an eye is formed in each of the second sections, so that the warps are produced in at least three different colours, and so that the warps are led in two outer layers and at least one intermediate layer in each of the two belts, with optional colours in the individual layers, and so that in the longitudinal direction of the strap there is a sequence of colours and/or patterns, marking each eye in the strap unambiguously.

The outer layers in adjacent first sections of a second part, or parts of the adjacent first sections may be made in the same colour as the second part.

The optional colours in the individual layers may be established over the whole width of the strap. The width of the strap is measured at right angles to the longitudinal direction of the strap.

The strap may comprise at least three eyes.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the outer layers on both outsides of the strap are produced in the same colour and/or pattern in any section of the strap.

According to a further embodiment, a distinctive feature of the strap according to the invention is that one colour and/or one pattern is used only once in the second section of a strap. So that there is a sequence of colours and/or patterns, marking each eye in the strap unambiguously.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the first belt and the second belt are identical.

The belts may be approximately identical. Alternatively, the belts may be completely identical.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the first belt and the second belt comprise the same number of warps and wefts.

According to a further embodiment, a distinctive feature of the strap according to the invention is that in each first section, where the first belt and the second belt are interwoven, the at least three layers of one belt may be freely arranged with the layers of the second belt.

According to a further embodiment, a distinctive feature of the strap according to the invention is that only one colour and/or one pattern is used in the second section of a strap, so that there is a sequence of colours and/or patterns characterizing each eye in the strap.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the strap comprises elastic threads at least in one part of the longitudinal direction of the strap.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the strap comprises an elastic element at least in one part of the longitudinal direction of the strap.

The elastic may therefore have the effect that at least in one part the strap contracts in the unloaded state. In the loaded state the elastics will give, until the threads counteract the load. Therefore the strap is shorter in the unloaded state relative to the loaded state.

This is advantageous in particular with long straps. For example if the sling is on a chair or a bed and is ready for use. The straps will thus not be in the way for the care personnel. In the unloaded state the straps are shorter than in the loaded state on account of the elastic threads or the elastic element. In the unloaded state the straps are not in contact with the floor and do not pick up dirt and are thus hygienic.

According to a further embodiment, a distinctive feature of the strap according to the invention is that it is made as a tube in one part of the longitudinal direction of the strap and comprises elastic threads at least in one part of the longitudinal direction of the strap.

The tubular part is advantageous as it both protects the elastic and makes contraction of the strap easier in the unloaded state.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the colours and/or patterns on the outsides in each partial section consist of coloured stripes in the longitudinal direction, where each coloured stripe is established on only a part of the width of the strap in the transverse direction. According to a further embodiment, a distinctive feature of the strap according to the invention is that the colours and/or patterns on the outsides in each partial section are formed of only one warp with a colour that comprises the whole partial section.

According to a further embodiment, a distinctive feature of the strap according to the invention is that patterns are formed on the outsides in each partial section, said patterns being formed of several warps, for example two, each with its own colour, and said patterns comprise the whole partial section.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the first belt and the second belt are displaced relative to one another in the transverse direction parallel to the wefts.

According to a further embodiment, a distinctive feature of the strap according to the invention is that at one end edge the strap is connected to a third section, which is formed as an extension of the strap.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the strap and the third section are made with continuous warps.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the third section is made with interweaving of the longitudinal lateral edges of one of the two belts.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the third section is made with interweaving of the longitudinal lateral edges of the two belts, so that the third section is tubular.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the tubular third section comprises an elastic element.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the at least three layers of the first and second belt of the third section are interwoven in a different weaving width than the strap.

According to a further embodiment, a distinctive feature of the strap according to the invention is that two straps at one end edge are connected together by a third section, which is formed as an extension of the two straps, and that the two straps and the third section are produced with continuous warps, and that the third section is made with interweaving of the longitudinal lateral edges of one of the two belts.

The straps are arranged oppositely oriented or laterally reversed.

The effect this produces is that the intermediate piece may be used for being sewn/joined on one edge of the sling. There is then formation of a fold, which comprises the edge of the sling. The intermediate piece may also be sewn/joined to the surface of the sling.

This gives a strong construction, which can withstand large loads, as the two straps and the intermediate piece form a continuous item. Thus, there are no seams or the like, which may constitute a weak point.

Moreover, with this strap it is possible to join the sling and intermediate piece together with an elongated seam along an edge and/or on the surface of the sling. In this way the forces are transmitted from the sling to the strap on a large area, which gives a durable construction.

Furthermore, the intermediate piece forms a durable edge on the sling, which protects against wear and soiling and increases the life of the sling.

The aforementioned designs will improve quality in sling production, where the individual components of the sling are traditionally joined together by sewing or other joining techniques. Any joint increases the risk of failure and subsequent breakage. In addition, the designs will be time-saving and will reduce the cost price per unit. The aforementioned advantages also apply to the designs given hereafter in the present patent application.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the colours and/or patterns on the outsides in each partial section consist of coloured stripes in the longitudinal direction, where each coloured stripe is established on only a part of the width of the strap in the transverse direction.

According to a further embodiment, a distinctive feature of the strap according to the invention is that the colours on the outsides in each partial section are formed of only one warp with a colour that comprises the whole partial section. Alternatively, patterns may be formed on the outsides in each partial section, which is formed of several warps, for example two, each with its own colour, and said patterns comprise the whole partial section.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, said method comprising a step in which the strap produced is elongated with short end edges and longer lateral edges and comprises a first belt and a second belt, where the strap is produced with each belt comprising an inside and an outside, where the strap is produced with the insides turned towards one another, and the outsides turned away from one another, where the strap is produced with the first belt and the second belt comprising warps and wefts, where the strap is produced with a longitudinal direction that is parallel to the warps, and a transverse direction that is parallel to the wefts, where a number of first sections are formed in the longitudinal direction of the strap, where the first belt and the second belt are interwoven, and second sections are provided between them, where the first belt and the second belt are not interwoven, so that an eye is formed in each of the second sections, where the warps are produced in at least three different colours, where the warps are made of two outer layers and at least one intermediate layer in each of the two belts with optional colours in the individual layers, and where a sequence of colours and/or patterns, marking each eye in the strap unambiguously, is formed in the longitudinal direction of the strap.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, where the strap is produced with the outer layers on both outsides of the strap produced in the same colour and/or pattern in any section of the strap.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, where one colour and/or one pattern is used only once in the second section of a strap.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, where the strap is produced with the first belt and the second belt being identical.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, where the strap is produced with the first belt and the second belt comprising the same number of warps and wefts.

A further aspect of the invention is a method for producing a strap intended for a sling for persons, where the strap is produced comprising elastic threads at least in one part of the longitudinal direction of the strap.

A further aspect of the invention is a use of a strap, as described above, where the strap is used for lifting a sling for a person together with at least one further strap, as described above, and where the straps are fastened to a sling for persons.

The straps will preferably be identical.

The invention is explained in more detail hereunder, referring to the appended drawings, where.

In the description of the figures, identical or equivalent elements will be designated with the same reference symbol in the various figures. Therefore a fully detailed explanation will not be given in connection with each individual figure/embodiment.

Unless described otherwise, differently hatched areas in the figures will characterize different colours and/or patterns <NUM>.

<FIG> shows a strap <NUM> for a sling (not shown) for persons according to the invention. The strap <NUM> is elongated with short end edges <NUM> and longer lateral edges <NUM> and comprises a first belt <NUM> and a second belt <NUM>. The first belt and the second belt are identical. Each belt comprises an inside <NUM> and an outside <NUM>, where the insides <NUM> are turned towards one another, and the outsides <NUM> are turned away from one another, where the first belt <NUM> and the second belt <NUM> comprise warps and wefts. The strap has a longitudinal direction <NUM>, which is parallel to the warps, and a transverse direction that is parallel to the wefts. In the longitudinal direction of the strap there are a number of first sections <NUM>, where the first belt <NUM> and the second belt <NUM> are interwoven, and second sections <NUM> are provided between them, where the first belt and the second belt are not interwoven. An eye is formed in each of the second sections <NUM>. The hatched areas indicate different colours and/or patterns <NUM>. The colour and/or pattern is identical on each of the outsides of the strap. The strap is rolled up at one end. The outer layers <NUM> on both outsides <NUM> of the strap <NUM> are produced in the same colour and/or pattern <NUM> in any section of the strap. One colour and/or one pattern <NUM> is used once in the second section of a strap <NUM>, so that there is a sequence of colours and/or patterns, which clearly mark each eye <NUM> in the strap.

<FIG> shows a sketch of the design and production of a strap according to the invention. The warp can be seen, led in two outer layers <NUM> and an intermediate layer <NUM> for each belt.

The warps <NUM> are produced in at least three different colours (not shown) with optional colours in the individual layers. The outer layers <NUM> on both outsides <NUM> of the strap <NUM> are produced in the same colour and/or pattern <NUM> in any section of the strap, and one colour and/or one pattern is used only once in the second section of a strap, so that there is a sequence of colours and/or patterns, marking each eye in the strap unambiguously.

<FIG> shows a sketch of a strap <NUM> according to the invention. It shows an alternative design of sequences of colours and/or patterns that clearly mark each eye <NUM> in the strap. Each colour and/or pattern <NUM> is only used for one second section <NUM> in the strap. Some adjacent first sections <NUM> of each second section <NUM> are produced with the same colour and/or pattern as the first section <NUM>. The colours <NUM> on the outsides <NUM> in each partial section are formed of only one warp with a colour that comprises the whole partial section or are formed as patterns <NUM> on the outsides <NUM> in each partial section, said patterns being formed of several warps, for example two, each with its own colour, and said patterns comprise the whole partial section.

<FIG> shows a sketch of a strap <NUM> according to the invention. It shows an alternative design of sequences of colours and/or patterns, which clearly mark each eye <NUM> in the strap. Each colour and/or pattern <NUM> is only used for one second section <NUM> in the strap. One of the adjacent first sections <NUM> of each second section <NUM> is produced with the same colour and/or pattern as the first section <NUM>.

<FIG> shows a sketch of a strap <NUM> according to the invention with five eyes <NUM>, where an end edge <NUM> of the strap consists of a section, where the first belt <NUM> and the second belt <NUM> are not interwoven. This embodiment is particularly suitable for fastening the strap on the sling (not shown), where the strap will not be sewn along the edge of the sling. Thus, one belt may be placed on one side of the sling, and the other belt placed on the other end of the sling, and the seam goes through both belts and the sling.

<FIG> shows a sketch of a strap <NUM> according to the invention, as described in <FIG>, with four eyes <NUM>.

<FIG> shows straps <NUM> according to the invention fastened to a sling <NUM>. The straps may be sewn on the sling on only one side <NUM> of the sling with a single belt, or they may be sewn on both sides of the sling with the first belt <NUM> on one side <NUM> and the second belt <NUM> on the other side <NUM> of the sling.

<FIG> shows the sling <NUM> with straps <NUM>, which is shown in <FIG>, placed on a bed. The straps may be sewn on the sling on only one side <NUM> of the sling with a single belt, or they may be sewn on both sides of the sling with the first belt <NUM> on one side <NUM> and the second belt <NUM> on the other side <NUM> of the sling.

<FIG> shows two straps <NUM>, which at one end edge <NUM> are joined together by a third section <NUM>, which is formed as an extension of the two straps <NUM>. The two straps <NUM> and the third section <NUM> are produced with continuous warps (not shown), and the third section <NUM> is produced with interweaving of the longitudinal lateral edges of one of the two belts <NUM>. The two straps are assembled oppositely oriented, i.e. laterally reversed. This can be seen from the colour markings.

<FIG> shows the same two straps <NUM> joined together by a third section <NUM>, as shown in <FIG>, with the third section folded together. The third section may be folded, so that it forms a fold, which can receive the edge <NUM> of a sling (not shown) and be sewn to the sling along the edge <NUM>. This gives a very durable connection to the sling, as the forces that arise during loading are distributed over a large area. Furthermore, the third section acts as protection against wear and soiling of the sling.

<FIG> show straps according to the invention, where the colours and/or patterns <NUM> on the outsides <NUM> in each partial section consist of coloured stripes in the longitudinal direction, where each coloured stripe is established on only a part of the width of the strap in the transverse direction.

<FIG> shows schematically how these stripes are formed by means of warp of different colours, where each colour of warp only takes up a part of the width of the strap.

<FIG> shows a strap where the colours and/or patterns <NUM> on the outsides are established over the whole width of the strap in the transverse direction. The colours and/or patterns <NUM> are provided on the second sections of the strap.

<FIG> shows a strap where the colours and/or patterns <NUM> on the outsides are established on only a part of the width of the strap in the transverse direction. The colours and/or patterns <NUM> are provided on the second sections of the strap and on one of the adjacent first sections of any other section.

<FIG> show sketches of a strap according to the invention, which comprises elastic threads in one part of the longitudinal direction of the strap. On the left, the strap is shown in the loaded state, where the elastic threads <NUM> are expanded, and the length of the strap is increased. On the right, the strap is shown in the unloaded state, where the elastic threads <NUM> reduce the length of the strap. The straps are thus lifted up from the floor when the sling is left ready for use, for example on a bed or a chair.

The elastic threads may either be internal, or they may be woven in. The part of the strap that comprises elastic threads may advantageously be formed as a tubular part. The elastic threads <NUM> in the third section of the strap are shown.

For clarity of the drawing, hatching of colours and/or patterns is omitted in <FIG>.

<FIG> shows sketches of a strap according to the invention, which comprises an elastic element in one part of the longitudinal direction of the strap. On the left, the strap is shown in the loaded state, where the elastic element <NUM> is expanded, and the length of the strap is increased. On the right, the strap is shown in the unloaded state, where the elastic element <NUM> reduces the length of the strap. The straps are thus lifted up from the floor when the sling is left ready for use, for example on a bed or a chair.

The elastic element <NUM> may, in a preferred embodiment, either be internal or may be woven in. The part of the strap that comprises the elastic element <NUM> may advantageously be formed as a tubular part. The elastic element <NUM> can be seen in the third section of the strap.

<FIG> show a strap <NUM> according to the invention, which comprises elastic threads in one part of the longitudinal direction of the strap. A part of the first sections <NUM> comprises elastic threads. On the left, the strap is shown in the loaded state and on the right in the unloaded state. Colours and/or patterns <NUM> shown in <FIG> comprise a second section and a part of the adjacent first sections. In <FIG>, marking of colours and/or patterns is omitted for clarity. The elastic threads <NUM> in the strap can be seen.

<FIG> shows a sling <NUM> in use with a person in the sling <NUM> with straps <NUM> according to the invention. The straps <NUM> are joined together with third sections <NUM>, forming a fold, and sewn on the edge <NUM> of the sling <NUM>. Two different perspective views are shown.

<FIG> show a strap <NUM> according to the invention, where the first belt <NUM> and the second belt <NUM> are displaced relative to one another in the transverse direction <NUM> parallel to the wefts <NUM>. <FIG> shows a perspective view of the strap, and <FIG> shows a cross-section through the strap <NUM> in one of the first sections <NUM> of the strap <NUM>.

<FIG> shows a strap <NUM> according to the invention, where the colours and/or patterns <NUM> are applied on first sections <NUM> of the strap <NUM>. The colours and/or patterns <NUM> mark the adjacent second section <NUM>.

<FIG> shows a strap <NUM> according to the invention, where markings are applied in the form of numbers in second sections of the strap and colours and/or patterns <NUM> on an adjacent first section. The numbers and the colour and/or pattern <NUM> characterize each eye in the strap <NUM> unambiguously.

At one end edge the strap <NUM> is connected to a third section <NUM>, which is formed as an extension of the strap <NUM>. The strap and the third section <NUM> are produced with continuous warps <NUM>. The third section <NUM> is produced with interweaving of the longitudinal lateral edges of the two belts, so that the third section is tubular.

<FIG> shows a strap <NUM> according to the invention. The strap is connected at one end edge to a third section, which is formed as an extension of the strap. The strap and the third section are produced with continuous warps. The third section is produced with interweaving of the longitudinal lateral edges of the two belts, so that the third section is tubular.

<FIG> shows a strap <NUM> according to the invention. Each eye in the strap is characterized unambiguously with a colour and/or pattern <NUM> in the middle of the second sections <NUM>. The marking only comprises a part of the second sections. It is square. Alternatively it may be oblong.

<FIG> shows a strap <NUM> according to the invention. Each eye in the strap is characterized unambiguously with one or more stripes with a colour and/or pattern in the middle of the second sections. In the part of the strap that is fastened to the sling <NUM> (not shown), the first belt <NUM> and the second belt <NUM> of the strap are not interwoven. The strap may then be fastened on two sides of the sling <NUM> for example by sewing. For example, it may be sewn through both belts and the sling. A very durable assembly is formed.

<FIG> shows a strap <NUM> according to the invention. The strap is connected on one end edge to a third section, which is formed as an extension of the strap. The strap and the third section are produced with continuous warps. The at least three layers of the first and second belt of the third section are interwoven in a different weaving width than the strap.

<FIG> shows a strap <NUM> according to the invention. The strap is connected on one end edge <NUM> to a third section, which is formed as an extension of the strap. The strap and the third section are produced with continuous warps. The at least three layers of the first and second belt of the third section are interwoven in a different weaving width than the strap.

Each eye in the strap is characterized with colours and/or patterns in a part of the adjacent first sections of the eye.

<FIG> shows straps according to the invention. The straps are connected on one end edge to a third section, which is formed as an extension of the strap. The strap and the third section are produced with continuous warps. The at least three layers of the first and second belt of the third section are interwoven in a different weaving width than the strap.

The straps <NUM> are fastened to a sling <NUM>. Only one section <NUM> of the sling can be seen.

<FIG> shows a strap according to the invention. The strap is provided with an extra eye near the part of the strap that is fastened to the sling (not shown). This extra eye may be used for holding the projecting part <NUM> of the strap close to the sling. The projecting part of the strap is the part that projects beyond the sling. See also <FIG>.

The extra eye of the strap may have a different colour combination and/or pattern than the other eyes in the strap.

<FIG> shows a strap according to the invention. The strap is provided with an extra eye near the part of the strap that is fastened to the sling <NUM>. A section <NUM> of the sling can be seen. This extra eye <NUM> may be used for holding the projecting part <NUM> of the strap close to the sling, by inserting the free end <NUM> of the strap in the extra eye of the strap, as shown in the figure.

<FIG> shows a strap <NUM> according to the invention. Each eye in the strap may have a different colour and/or pattern. In the part of the strap that is fastened to the sling (not shown), the first belt and the second belt of the strap are not interwoven. The strap may then be fastened on two sides of the sling, for example by sewing. For example, it can be sewn through both belts and the sling. A very durable assembly is formed.

<FIG> shows a strap <NUM> according to the invention. Each eye in the strap may have different colours and/or patterns. In the part of the strap that is fastened to the sling (not shown), the first belt and the second belt of the strap are not interwoven. The strap may then be fastened on two sides of the sling, for example by sewing. For example, it can be sewn through both belts and the sling. A very durable assembly is formed.

<FIG> shows two straps <NUM>, which are joined together at one end edge <NUM> by a third section <NUM>, which is formed as an extension of the two straps <NUM>. The two straps <NUM> and the third section <NUM> are produced with continuous warps (not shown), and the third section <NUM> is produced, by the at least three layers of the first and second belt of the third section being interwoven in a different weaving width than the straps. The two straps are put together oppositely oriented, i.e. laterally reversed. This can be seen from the colour markings.

Claim 1:
Strap (<NUM>) intended for a sling (<NUM>) for persons, where the strap is elongated with short end edges (<NUM>) and longer lateral edges (<NUM>) and comprises a first belt (<NUM>) and a second belt (<NUM>), where each belt (<NUM>,<NUM>)comprises an inside (<NUM>) and an outside (<NUM>), where the insides (<NUM>) are turned towards one another, and the outsides (<NUM>) are turned away from one another, where the first belt (<NUM>) and the second belt (<NUM>) comprise warps (<NUM>) and wefts (<NUM>), where the strap (<NUM>) has a longitudinal direction (<NUM>) that is parallel to the warps (<NUM>) , and a transverse direction (<NUM>) that is parallel to the wefts (<NUM>), where in the longitudinal direction (<NUM>) of the strap there are a number of first sections (<NUM>) where the first belt (<NUM>) and the second belt (<NUM>) are interwoven, and second sections (<NUM>) are provided between them, where the first belt (<NUM>) and the second belt (<NUM>) are not interwoven, so that an eye (<NUM>) is formed in each of the second sections (<NUM>), where in the longitudinal direction (<NUM>) of the strap (<NUM>) there is a sequence of colours and/or patterns (<NUM>), marking each eye (<NUM>) in the strap unambiguously, characterized in that warps (<NUM>) are produced in at least three different colours, and in that the warps (<NUM>) are led in two outer layers (<NUM>) and at least one intermediate layer (<NUM>) in each of the two belts (<NUM>,<NUM>) with optional colours in the individual layers.