EP4047156B1 - Toeboard made of plastic - Google Patents

Description

Technical area

The invention relates to a toe board for a scaffolding for the lateral delimitation of running and/or working surfaces of scaffolding decking.

State of the art

In building and scaffolding construction, toe boards are used to limit the sides of scaffolding surfaces in order to prevent people from slipping to the side and/or objects from falling. They have a board body, which usually consists of solid wood or an aluminum or steel profile, and has a rectangular board profile. Connecting pieces made of steel or aluminum are attached to the narrow front side edges using screws or rivets, which are used to create a connection to the scaffolding or an adjacent toe board. Such toeboards are, for example DE1960069U , DE3813513A1 , EP1950360A1 , DE102008023525A1 or EP1950360A1 known.

Plastic toe boards are also disclosed. For example describes DE3434362A1 a hollow chamber plank made of plastic for scaffolding construction, whereby the core of the plastic plank consists of high chambers made of hard PVC.

In WO0104437A1 describes a scaffolding plank made of plastic, which is reinforced with glass fibers and optionally with steel. GB2346921A discloses a rectangular scaffold panel made of polymer material with a foamed polymer core.

The document FR3077592 discloses a toe board according to the preamble of claim 1.

The known and described toe boards have a rectangular board profile. In practice, toeboards made of wood have mainly become established because they are light, inexpensive and easy to manufacture. The disadvantage of wooden toe boards is that they begin to look worn and worn out after just a few years due to mechanical wear and weathering, which leads to an unaesthetic appearance on a construction site. In addition, damaged wooden boards can lead to injuries. Although aluminum toeboards are light, they are comparatively expensive and time-consuming to produce. Steel toeboards are also complex to manufacture, and handling them involves a significant risk of injury due to sharp edges in the edge area. Plastic toeboards have not yet become established in practice because the known plastic toeboards are too expensive, too heavy or not stable enough.

Task of the invention

The present invention is based on the object of providing a toeboard for a scaffolding which is durable, stable, visually appealing, light, cost-efficient and sustainable.

Description of the invention

This object is achieved by a toe board for a scaffold according to claim 1, which is formed from a hollow profile made of plastic with a first long side and a second long side and two narrow side edges, at least one of the long sides of the hollow profile being curved in cross section. Toe boards must be high Meet requirements regarding stability/impact strength and rigidity with the lowest possible weight. For example, toe boards with a reference length of 3 m should ideally not weigh more than 6 kg, should not bend more than 35 mm in the middle of the toe board under a load of 150 N, i.e. have a high level of rigidity, and can withstand a fall height of 1 m without damage. In addition, the toeboard should be exposed to sunlight and weather conditions can reach a lifespan of 10 years and can preferably be dyed in many colors. The toe board according to the invention meets these requirements thanks to the special hollow profile made of plastic. With a hollow profile it is possible to produce a toe board with less weight. Material can also be saved, making the toe board cheaper. The curvature of at least one long side of the hollow profile results in a higher bending moment of resistance than with a rectangular hollow profile, which makes the toe boards more resistant to bending.

Curved is understood to mean a shape that has the shape of a curvature, an arch, a curvature or a crescent. The term angular is understood to mean a shape which has one or more obtuse angles, with the apex of the angle being arranged in the middle or outside the middle of the long side. The curved shape is chosen so that preferably a large part of the plastic mass of the hollow profile is as far away as possible from the neutral phase in order to achieve the highest possible bending moment of resistance. In strength theory, the neutral phase, also known as the neutral fiber or zero line, is the fiber or layer of a beam cross-section whose length does not change when twisted or bent. The stress there does not cause any tensile or compressive stress.

Preferably both long sides, i.e. the first long side and the second long side, are curved in cross section. The two long sides particularly preferably run parallel to one another. On the one hand, this leads to increased stability of the toe boards. On the other hand, the toe boards can be stacked with parallel long sides, which is an additional advantage of the toe boards according to the invention.

In a preferred embodiment, at least one of the longitudinal sides of the hollow profile is designed to be curved outwards in cross section. The term outside here means the direction of the curvature, which points away from the center line of the toe board.

Preferably, the first long side of the hollow profile is curved outwards and is also called the outer long side. The second longitudinal side is flat in the cross section of the hollow profile or is preferably curved inwards. The second long side is also called the inner long side. The term inside here means the direction of the curvature, which points towards the center line of the toe board. Preferably, the two long sides of the hollow profile run parallel to one another and the first outer long side is curved outwards and the second inner longitudinal side is curved inwards.

When using the toe board as a lateral boundary of scaffolding floors, the at least one outwardly curved or angled long side is attached in the direction of the outside of the scaffolding floor. The first long side is preferably arranged on the outer side of the toe board in the direction of the outside of the scaffold floor. The second longitudinal side is preferably arranged on the inner side of the toe board in the direction of the running surface of the scaffold floor. When used as a toe board, the inner side of the toe board serves as a lateral boundary for scaffolding floors.

According to the invention, a curved shape is used. This half-moon shape leads to particularly stiff toeboards, especially when a large amount of material is at the greatest possible distance from the neutral fiber. In order to be able to stack the toe boards, the outer radii of the two long sides are preferably parallel to one another. The insides of the two long sides can have different radii or preferably a partially elliptical shape.

In a further embodiment, the two narrow side edges of the toe board each have two parallel flat surfaces, perpendicular to the narrow side edges. This leads to better stackability of the toe boards, especially with curved long sides.

The toeboard according to the invention is preferably made from a thermoplastic. Examples of suitable thermoplastics are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polyethylene terephthalate (PET). PET is particularly preferred, and glycol-modified PET (PET-G) is even more preferred. The plastic is preferably made partly or completely from recycled plastic. Plastic recyclates are particularly cost-effective and sustainable. Thermoplastics are recyclable, which means that the thermoplastic toeboard according to the invention can be recycled again after use. This further contributes to sustainability. The hollow body is preferably made of plastic using an extrusion process. Other possible manufacturing processes include pultrusion, injection molding (GIT, WIT), pressing combined with welding or with foldable or soluble cores or 3D printing.

In a preferred embodiment, the hollow profile made of plastic is reinforced with fibers, preferably with glass fibers. Also suitable fibers are natural fibers, preferably from waste, wood, cellulose, flax, coconut, hemp, bamboo or rice husks. The hollow profile preferably has 10 to 70% by weight of fibers, preferably 30 to 50% by weight of fibers, particularly preferably 40 to 45% by weight of fibers, based on the total weight of the hollow profile.

In a further embodiment, the hollow profile has at least one reinforcing rib between the two long sides, which preferably connects the first long side and the second long side to one another. This additionally increases the stability of the toe boards. Preferably, the at least one reinforcing rib is arranged in the middle of the long sides perpendicular to the long sides and connects the vertices of the two long sides to one another. Several, for example two, three or four, reinforcing ribs can also be arranged between the two long sides, which preferably connect the two long sides to one another. The reinforcing ribs can be arranged perpendicular to the long sides or obliquely to the long sides, for example in a zigzag shape.

Particularly high stability and flexural rigidity of the toeboards is achieved when the toeboard has ribs with free ends on the inside of the long sides. These free-ended ribs can be used in addition to the at least one reinforcing rib or instead of the reinforcing rib in the hollow profile. The free-ended ribs are preferably arranged in the area of or near the apex of the first outer long side or in the area or near the narrow side edges at the ends of the second inner long side. Particularly preferably, the ribs with free ends are arranged both in the area or near the apex of the first outer long side and in the area or near the narrow side edges at the ends of the second inner long side.

The hollow profile preferably has a wall thickness of 1 to 5 mm. This wall thickness can be partially reinforced to increase the stability and bending stiffness of the toe boards. Preferably, the first outer long side in the middle region near the apex or the second inner long side in the outer region near the narrow side edges has increased wall thicknesses. The increased wall thicknesses are particularly preferably arranged both in the central area near the apex of the first outer long side and in the outer area near the narrow side edges at the ends of the second inner long side. The increased wall thickness has a similar effect to the free-ended ribs.

Preferably, the hollow profile at least partially has a further plastic layer on the outside of the profile. Preferably, at least the outside of the first outer longitudinal side has a further plastic layer. Even more preferably, the further plastic layer completely encloses the hollow profile. The plastic of the further plastic layer is preferably a thermoplastic, preferably a UV-resistant thermoplastic Plastic. The plastic of the further plastic layer is preferably made from recycled plastic. Thermoplastics for the further plastic layer are acrylonitrile-styrene-acrylate copolymers (ASA), polyethylene (PE), in particular high-density polyethylene (HDPE), polymethyl methacrylate (PMMA), PET, styrene-acrylonitrile copolymers (SAN), acrylonitrile -Butadiene styrene (ABS), PVC, polyamide (PA) or polypropylene (PP). Unreinforced acrylonitrile-styrene-acrylate copolymers (ASA) are particularly preferred. In a further embodiment, the plastic of the further plastic layer can be reinforced with glass or natural fibers. Preferably, the plastic of the further plastic layer is UV-resistant or additionally contains a UV-resistant material, preferably an inorganic pigment, which maintains the color intensity of the further plastic layer over a longer period of time. This further leads to the longevity of the toe board and a better aesthetic appearance. In addition, toe boards can be made in any color, including signal colors, and advertising or company names can be attached via the additional plastic layer. The further plastic layer preferably has a thickness between 0.1 mm and 3 mm, preferably a thickness of 0.5 mm. The further plastic layer is produced, or co-extruded, together with the hollow profile made of plastic, for example, using a co-extrusion process. The additional plastic layer can also be sprayed onto the hollow plastic profile using other methods, such as painting. If the hollow profile of the toe board is made from a UV-resistant plastic that can be easily colored, no further plastic layer is necessary.

In a further embodiment, the hollow profile can be partially or completely filled with a material of low density, also called low-density material. Plastic foams made of polyurethane (PU), PET, PE, PP or PVC, for example, can be used as low-density materials.

To attach the toe board to a scaffold, connecting elements or connecting pieces are used on the end faces, which are made using Rivets, screws or clamping devices are used to establish a connection to a scaffold or an adjacent toe board.

In one embodiment of the present invention, the toe board additionally has a connecting element on the end faces for fastening to a scaffold, the connecting element being manufactured in one piece with the toe board. The connecting element is preferably produced from the end faces of the toe board by means of a pressing process, in which the end silks of the toe board are placed in a tool and formed into integrated connecting elements.

A further subject of the present invention relates to a toe board comprising a connecting piece made of plastic for attaching a toe board according to the invention to a scaffolding, the connecting piece having a fastening element for attaching the toe board to a scaffold and an insertion element for insertion into the toeboard, the insertion element being complementary is designed to form the hollow profile of the toe board.

The fastening element preferably has at least one opening for receiving screws, rivets or other fastening means for fastening to scaffolding. The fastening element can either be attached directly to a scaffold or another toeboard using screws, rivets or other fasteners. In a further embodiment, the fastening element is mounted on a scaffold via a scaffold fitting, preferably a metal fitting. The fastening element is preferably made of a thermoplastic and is preferably reinforced with fibers, preferably with recycled glass fibers.

The plug-in element is designed to complement the hollow profile. Preferably, the insertion element has at least one elevation and at least one depression, wherein in the inserted state the elevation is clamped to the inside of the first longitudinal side of the hollow profile and the depression is clamped to the inside of the second longitudinal side of the hollow profile. In a preferred one Embodiment, the insertion element has several elevations and several depressions, which are arranged alternately and can be moved relative to one another, and function according to the harmonica principle. An insert element designed in this way contracts when inserted into the hollow profile and then expands again in the inserted final state.

Preferably, the at least one elevation and the at least one depression on the surface facing the inside of the long side have serrations, which hook into the inside of the hollow profile, so that the insertion element is prevented from being pulled out.

In a further embodiment, the insertion element has at least one recess for receiving at least one reinforcing rib of a toeboard. The recess preferably has the shape of a slot.

The plug-in element is preferably made of a thermoplastic. Examples of suitable thermoplastics are polyethylene (PE), polypropylene (PP), PA, ASA, ABS, SAN, polybutylene terephthalate (PBT) and polyethylene terephthalate (PET). PET and PP are particularly preferred. The plastic is preferably made partly or completely from recycled plastic. In a preferred embodiment, the plastic insert element is reinforced with fibers, preferably with glass fibers, particularly preferably with recycled glass fibers.

Preferably, the fastening element and the insertion element are made of the same plastic and are made in one piece. The connecting piece with the fastening element and the plug-in element are preferably manufactured using an injection molding process. Other manufacturing processes are also possible, such as pressing or 3D printing.

With the toeboards according to the invention made of a curved hollow profile made of plastic, it is possible to achieve the desired To produce long-lasting, stable, visually appealing, lightweight, cost-effective and sustainable toeboards, which can be attached to scaffolding together with the connecting piece. Further advantages of the invention follow from the following description, in which the invention is explained in more detail using exemplary embodiments shown in the drawings.

Short description of the characters

• Fig. 1A ein Bordbrett in perspektivischer Darstellung von schräg vorne auf die äussere Längsseite,
• Fig. 1B einen Querschnitt durch ein Bordbrett mit gewölbten Längsseiten,
• Fig. 1C zwei gestapelte Teilstücke von zwei Bordbrettern mit gewölbten Längsseiten in perspektivischer Darstellung von schräg vorne,
• Fig. 2A eine perspektivische Darstellung auf den Querschnitt eines Teilstücks eines Bordbretts von schräg vorne,
• Fig. 2B einen Querschnitt durch ein Bordbrett mit gewölbten Längsseiten und Rippen mit freiem Ende,
• Fig. 3A eine perspektivische Darstellung auf den Querschnitt eines Teilstücks eines weiteren Bordbretts von schräg vorne,
• Fig. 3B einen Querschnitt durch ein Bordbrett mit gewölbten Längsseiten und mehreren Verstärkungsrippen,
• Fig. 4A eine perspektivische Darstellung auf den Querschnitt eines winkelförmigen Bordbretts von schräg vorne, diese Lösung ist nicht gemäß der Erfindung,
• Fig. 4B einen Querschnitt durch ein Bordbrett mit winkelförmigen Längsseiten und mehreren Verstärkungsrippen, diese Lösung ist nicht gemäß der Erfindung,
• Fig. 5A eine perspektivische Darstellung auf ein Verbindungsstück mit einem Befestigungselement und einem Einsteckelement,
• Fig. 5B ein Verbindungsstück in einer Vorderansicht von vorne auf das Einsteckelement von Fig. 5A,
• Fig. 5C das Verbindungsstück von Fig. 5A in einer perspektivischen Darstellung von schräg unten,
• Fig. 6A eine perspektivische Darstellung auf ein weiteres Verbindungsstück mit einem Befestigungselement und einem Einsteckelement,
• Fig. 6B ein Verbindungsstück in einer Vorderansicht von vorne auf das Einsteckelement von Fig. 6A,
• Fig. 6C das Verbindungsstück von Fig. 6A in einer perspektivischen Darstellung von schräg unten,
• Fig. 7A ein Verbindungsstück und ein Bordbrett im nicht zusammengesteckten Zustand,
• Fig. 7B ein Verbindungsstück und ein Bordbrett im halb zusammengesteckten Zustand.

Show it:

• Fig. 1A a toe board in a perspective view from the front diagonally to the outer long side,
• Fig. 1B a cross section through a toe board with curved long sides,
• Fig. 1C two stacked sections of two toe boards with curved long sides in a perspective view from the front,
• Fig. 2A a perspective view of the cross section of a section of a toe board from the front diagonally,
• Fig. 2B a cross section through a toe board with curved long sides and ribs with free ends,
• Fig. 3A a perspective view of the cross section of a section of another toe board from the front diagonally,
• Fig. 3B a cross section through a toe board with curved long sides and several reinforcing ribs,
• Fig. 4A a perspective view of the cross section of an angular toe board from the front diagonally, this solution is not according to the invention,
• Fig. 4B a cross section through a toe board with angular long sides and several reinforcing ribs, this solution is not according to the invention,
• Fig. 5A a perspective view of a connecting piece with a fastening element and an insert element,
• Fig. 5B a connecting piece in a front view from the front of the plug-in element Fig. 5A ,
• Fig. 5C the connector of Fig. 5A in a perspective view from diagonally below,
• Fig. 6A a perspective view of another connecting piece with a fastening element and an insert element,
• Fig. 6B a connecting piece in a front view from the front of the plug-in element Fig. 6A ,
• Fig. 6C the connector of Fig. 6A in a perspective view from diagonally below,
• Fig. 7A a connecting piece and a toe board when not assembled,
• Fig. 7B a connecting piece and a toe board in a half-assembled state.

In the figures, the same reference numbers are used for the same elements and explanations of a specific reference number apply to all figures unless expressly stated otherwise.

Embodiments of the invention

Figure 1A shows a toeboard 1 for a framework made of a hollow profile 2 made of plastic with a first long side 3 and a second long side 4 and two narrow side edges 5. Both long sides are curved in the form of an arc and run parallel to one another. The first long side 3 has a convex curvature towards the outside and is referred to as the outer long side 3. The second long side 4 has a concave inward curvature and is referred to as the inner long side 4. The first long side 3 has an inside 15, and the second long side 4 has an inside 16. The two inner sides 15, 16, together with the inner sides of the narrow side edge 5, delimit the cavity of the hollow profile 2. The two narrow side edges 5 of the toe board 1 have, perpendicular to the narrow side edges 5, two parallel flat surfaces 6, 7, which are the serve better stackability. Between the two long sides 3,4 there is one parallel to the two narrow side edges 5 Reinforcing rib 9 arranged, which connects the apex 23 of the first long side 3 with the apex 23 'of the second long side 4. This increases the bending stiffness and stability of the toe boards. The hollow profile 2 is completely surrounded by a further plastic layer 8. The hollow profile 2 is made from a recycled glycol-modified glass fiber reinforced PET (rPETG). The further plastic layer 8 is made from recycled acrylonitrile-styrene-acrylate copolymers (ASA). The hollow profile 2 and the further plastic layer 8 are produced using a co-extrusion process.

In Figure 1B is that in Figure 1A Toe board 1 described shown in cross section from a hollow profile 2 made of plastic with a first long side 3 and a second long side 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which envelops the hollow profile 2 , and a reinforcing rib 9, which connects the apex 23 of the first long side 3 with the apex 23' of the second long side 4.

In Figure 1C are two sub-segments of the in Figure 1A described toeboards 1 shown in the stacked state, each consisting of a hollow profile 2 made of plastic with a first long side 3 and a second long side 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which forms the hollow profile 2 envelops, and a reinforcing rib 9, which connects the apex 23 of the first long side 3 with the apex 23 'of the second long side 4. The parallel surface 7 of the second long side 4 of the upper toe board 1 rests on the parallel surface 6 of the first long side 3 of the lower toe board 1. The outside of the first long side 3 of the lower toe board 1 partially touches the outside of the second long side 4 of the upper toe board 1, which stands on the first toe board 1.

Figure 2A shows a sub-segment of the as in Figure 1A described toe board 1 for a framework made of a hollow profile 2 made of plastic with two curved long sides 3, 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which envelops the hollow profile 2, and a reinforcing rib 9. In addition to the in Figure 1A The toeboard described has the in Figure 2A The hollow profile shown has 2 additional ribs with a free end 19. Four further ribs with free ends 19 are arranged in the area or near the apex of the first outer long side 3 and two each near the narrow side edges 5 at the ends of the second inner long side 4. The ribs with a free end 19 additionally increase the bending stiffness and stability of the toe board 1. Instead of the further ribs with a free end, it is also possible in a further variant to increase the wall thickness in the middle area near the apex of the first outer long side 3 and in the outer area to enlarge the narrow side edges 5 at the ends of the second inner long side 4.

In Figure 2B is that in Figure 2A Toe board 1 described shown in cross section from a hollow profile 2 made of plastic with a first long side 3 and a second long side 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which envelops the hollow profile 2 , a reinforcing rib 9, which connects the vertices of the two long sides 3, 4, and additional ribs with free ends 19 near the vertex 23 of the first long side 3 and near the narrow side edges 5 at the ends of the second inner long side 4.

Figure 3A shows that as in Figure 1A described toeboard 1 for a framework made of a hollow profile 2 made of plastic with two curved long sides 3, 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which envelops the hollow profile 2, and one Reinforcing rib 9. In addition, the hollow profile 2 has two further reinforcing ribs 9 ', which connect the two long sides 3, 4 with each other and are arranged between the middle reinforcing rib 9 and the two narrow side edges 5. This creates four hollow chambers. The Additional reinforcing ribs 9' additionally increase the flexural rigidity and stability of the toe board 1.

In Figure 3B is that in Figure 3A Toe board 1 described shown in cross section from a hollow profile 2 made of plastic with a first long side 3 and a second long side 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which envelops the hollow profile 2 , a central reinforcing rib 9, and two further reinforcing ribs 9', which connect the two long sides 3,4 with each other.

Figure 4A shows another toe board 1 for a framework made of a hollow profile 2 made of plastic with a first long side 3 and a second long side 4 and two narrow side edges 5. Both long sides 3, 4 are angular and run parallel to each other. The angle apexes 24, 24' of the two long sides 3, 4 are arranged offset from the middle of the long sides. The two narrow side edges 5 of the toe board 1 each have two parallel flat surfaces 6, 7, perpendicular to the narrow side edges 5, which serve to improve stackability. Between the two long sides 3, 4, a reinforcing rib 9 is arranged parallel to the two narrow side edges 5, which connects the angle apex 24 of the first long side 3 and the angle apex 24 'of the second long side 4 with one another. In addition, the hollow profile 2 has two further reinforcing ribs 9 ', which connect the two long sides 3, 4 with one another and are arranged between the central reinforcing rib 9 and the two narrow side edges 5. This creates four hollow chambers. The hollow profile 2 is completely surrounded by a further plastic layer 8. The hollow profile 2 is made from a recycled glycol-modified glass fiber reinforced PET (rPETG). The further plastic layer 8 is made from recycled acrylonitrile-styrene-acrylate copolymers (ASA). The hollow profile 2 and the further plastic layer 8 are produced using a co-extrusion process.

In Figure 4B is that in Figure 4A Toe board 1 described shown in cross section from a hollow profile 2 made of plastic with a first angular long side 3 and a second angular long side 4, two narrow side edges 5, two parallel surfaces 6, 7 perpendicular to the narrow side edges, a further plastic layer 8, which forms the hollow profile 2, a central reinforcing rib 9, and two further reinforcing ribs 9', which connect the two long sides 3,4 with each other.

In Figure 5A a connecting piece 10 made of plastic is shown for attaching a toe board with curved long sides to a scaffold. The connecting piece 10 has a fastening element 11 and an insertion element 12 for insertion into a toe board. The fastening element 11 consists of a plate 25 with several openings 21 for receiving rivets, screws and other fasteners. Using the rivets, screws and other fasteners, scaffolding fittings (not shown), preferably metal fittings, can be fastened to the fastening element 11. The scaffold fittings are used to mount a toe board on a scaffold. In addition, the fastening element 11 has a plurality of side walls 26 and a curved stop element 27, which serves as a stop and cover when the plug-in element 12 is inserted into a toe board. The fastening element 11 has two recesses 31 on the left and right underside, which serve as a water drain. The insertion element 12 is complementary to a hollow profile with curved long sides (as in Figures 1A and 1B shown). The insertion element 12 has two elevations 13, which extend on both sides from the center of the insertion element 12 in cross section and each merge into a center rib 28 pointing towards the center of the insertion element 12, which run perpendicular to the elevations 13. The insertion element 12 has a recess 18 between the two center ribs 28 in the middle of the insertion element 12 for receiving at least one reinforcing rib of a toeboard (in Figures 1A and 1B shown). The recess 18 has the shape of a slot. The insertion element 12 additionally has two recesses 14, each of which has a connecting rib 29 with the two elevations 13 are connected. The depressions 14 open into two side ribs 22, which run on the side edges of the insert element 12 in a parallel orientation to the central ribs 28. Such insertion elements 12 have a double-S shape in cross section, with the two Ss mirroring each other between the two central ribs 28. The alternately arranged elevations 13 and depressions 14 can be moved relative to one another and function according to the harmonica principle. When these insert elements 12 are inserted into a hollow profile of a toe board (not shown), the individual elements of the insert element 12 contract and expand again in the inserted final state. In the inserted state, the two elevations 13 are in contact and clamped with the inside of the first long side of a hollow profile of a toe board (not shown) and the two recesses 14 are in contact with the inside of the second long side of a hollow profile of a toe board (not shown). The elevations 13, depressions 14 and side ribs 22 have prongs 17 on the side that comes into contact with the inside of a hollow profile of a toe board, which hook into the inside of a hollow profile when inserted into a toe board, so that the insertion element is prevented from being pulled out. The connecting piece 10 with the fastening element 11 and the insertion element 12 is made from a recycled thermoplastic, preferably from PET reinforced with glass fibers, preferably via injection molding. Preferably, the fastening element 11 and the insertion element 12 are manufactured in one piece.

In Figure 5B is that in Figure 5A The connecting piece 10 described is shown in a front view from the front of the plug-in element 12. The double-S shape of the plug-in element 12 is shown with the slot-shaped recess between the double-S shapes, each with a central rib 28, an elevation 13, a connecting rib 29, a recess 14 and a side rib 22. Also shown are the side walls 26 and that curved stop element 27 of the fastening element 11. The fastening element 11 has two recesses 31 on the left and right underside, which serve as a water drain.

Figure 5C shows that in Figure 5A The connecting piece 10 described in a perspective view from obliquely below onto the underside of the connecting piece 10 with the fastening element 11 and the insertion element 12. The prongs 17 are visible on the underside of the recesses 14 and on the outside of the side ribs 22, which are visible when inserted hook a toeboard onto the inside of a hollow profile. In addition, the reinforcing struts 30 are visible on the underside of the plate 25 of the fastening element 11, which connect the openings 21 to one another and to the side walls 26 and reinforce the fastening element 11.

In Figure 6A is a further connecting piece 10 made of plastic for attaching a toe board with curved long sides to a framework, shown with a further fastening element 11 and an insert element 12. The insert element 12 has the same element as in Figure 5A described on each with two elevations 13 and depressions 14, connecting ribs 29 and side ribs 22, arranged in a double S shape. The fastening element 11 consists of a plate 25 with two openings 21 for receiving rivets, screws and other fasteners, which can be mounted directly on a scaffold. With this fastening element 11, no additional scaffolding fittings are necessary. The fastening means 11 also has side walls 26, a stop element 27 as in Figure 5A described and reinforcement struts 30. The reinforcing struts 30 serve to strengthen the connection between the stop element 27 and the plate 25, making the additional scaffolding coverings unnecessary.

In Figure 6B is that in Figure 6A The connecting piece 10 described is shown in a front view from the front of the plug-in element 12. The double-S shape of the plug-in element 12 is shown with the slot-shaped recess between the double-S shapes, each with a central rib 28, an elevation 13, a connecting rib 29, a recess 14 and a side rib 22. Also shown are the side walls 26, the plate 25 and the curved stop element 27 of the fastening element 11. The fastening element 11 has two recesses 31 on the left and right underside, which serve as a water drain.

Figure 6C shows that in Figure 6A The connecting piece 10 described in a perspective view from obliquely below onto the underside of the connecting piece 10 with the fastening element 11 and the insertion element 12. The prongs 17 are visible on the underside of the recesses 14 and on the outside of the side ribs 22, which are visible when inserted hook a toeboard onto the inside of a hollow profile. The fastening means 11 has additional reinforcing struts 30 on the underside of the connection between the stop element 27 and the plate 25, which serve to reinforce the connection between the stop element 27 and the plate 25.

In Figure 7A are those in Figure 6A shown connecting piece 10 made of plastic with the fastening element 11 and the plug-in element 12 as well as the in Figure 1A Shown toeboard 1 made of a hollow profile 2 made of plastic with a first curved long side 3 and a second curved long side 4 and a central reinforcing rib 9 shown. The connecting piece 10 and the toe board 1 are shown in the position shortly before the insertion element 12 is inserted into the hollow profile 2 of the toe board 1.

In Figure 7B are those in Figure 6A illustrated connecting piece 10 made of plastic with the fastening element 11 and the plug-in element 12 as well as the in Figure 1A Toeboard 1 shown is made of a hollow profile 2 made of plastic with a first curved long side 3 and a second curved long side 4 and a central reinforcing rib 9. The connecting piece 10 and the toe board 1 are shown in the half-inserted position of the insertion element 12 into the hollow profile 2 of the toe board 1.

The Figures 1-7 show a possible embodiment of the invention. Further embodiments are also conceivable within the meaning of the invention, for example a different shape of the long sides or other shapes of the reinforcing ribs.

Reference symbol list

1

Boardboard

2

Hollow profile

3

first long side

4

second long side

5

narrow side edge

6

first parallel surface

7

second parallel surface

8th

plastic layer

9, 9`

Reinforcing rib

10

connector

11

fastener

12

Insert element

13

increase

14

deepening

15

Inside of the first long side

16

Inside of the second long side

17

Pink

18

recess

19

Rib with free end

20

connecting element

21

opening

22

Side rib

23

Vertex of the first long side

23'

Vertex of the second long side

24

Angle apex of the first long side

24'

Angle apex of the second long side

25

plate

26

Side wall

27

stop element

28

midrib

29

connecting rib

30

Reinforcement struts

31

recess

Claims (18)

1. A toe board (1) for a scaffold, wherein the toe board consists of a hollow profile (2) made of plastic, and the hollow profile (2) in cross section has a first longitudinal side (3) and a second longitudinal side (4) and two narrow side edges (5), characterized in that at least one of the longitudinal sides (3, 4) of the hollow profile (2) is curved in cross section.
2. The toe board (1) according to claim 1, characterized in that at least one of the longitudinal sides (3, 4) of the hollow profile is curved outwardly in cross section.
3. The toe board (1) according to claim 1 or 2, characterized in that the first longitudinal side (3) and the second longitudinal side (4) are curved in cross section.
4. The toe board (1) according to claim 3, characterized in that the first longitudinal side (3) and the second longitudinal side (4) of the hollow profile run parallel to each other.
5. The toe board (1) according to one of the preceding claims, characterized in that the side edges (5) of the toe board each have flat surfaces (6, 7) that are parallel to each other.
6. The toe board (1) according to one of the preceding claims, characterized in that the plastic is thermoplastic, preferably glycol-modified PET.
7. The toe board (1) according to one of the preceding claims, characterized in that the plastic is made from recycled plastic.
8. The toe board (1) according to one of the preceding claims, characterized in that the plastic is reinforced with fibers, preferably glass fibers.
9. The toe board (1) according to one of the preceding claims, characterized in that the hollow profile (2) has at least one reinforcing rib (9) between the two longitudinal sides (3, 4).
10. The toe board (1) according to one of the preceding claims, characterized in that the hollow profile (2) at least partially has an additional plastic layer (8) on the exterior side.
11. The toe board (1) according to claim 10, characterized in that the additional plastic layer (8) is made of thermoplastic material.
12. The toe board (1) according to one of the preceding claims, characterized in that the front faces of the toe board (1) each have a connecting element (20) for fastening to a scaffold, wherein the connecting element (20) is fabricated as a single piece with the toe board.
13. The toe board (1) according to one of claims 1 to 11, characterized in that the toe board (1) further comprises a connecting piece (10) made of plastic for fastening the toe board (1) to a scaffold, wherein the connecting piece (10) has a fastening element (11) for fastening the toe board to a scaffold and an insertion element (12) for insertion into the toe board, wherein the insertion element (12) is designed complementary to the hollow profile (2) of the toe board (1).
14. The toe board (1) according to claim 13, characterized in that the insertion element (12) has at least one elevation (13) and at least one depression (14), wherein, in the inserted state, the elevation (13) is braced with the interior side (15) of the first longitudinal side (3) of the hollow profile (2), and the depression (14) is braced with the interior side (16) of the second longitudinal side (4) of the hollow profile (2).
15. The toe board (1) according to claim 14, characterized in that the at least one elevation (13) and the at least one depression (14) have spikes (17) on the surface that faces the respective interior side of the longitudinal sides.
16. The toe board (1) according to claim 14 or 15, characterized in that the insertion element (12) has several elevations (13) and several depressions (14), which are alternately arranged and movable relative to each other.
17. The toe board (1) according to one of claims 13 to 16, characterized in that the insertion element (12) is fabricated out of thermoplastic material.
18. The toe board (1) according to one of claims 13 to 17, characterized in that the fastening element (11) and the insertion element (12) are fabricated as a single piece.

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