System for a modular construction

Abstract

A system for modular construction of a a frame is provided in which the frame is composable by at least two frame members, each frame member having at least hollow ends, a comer piece, and inserts. Each frame member is connectable to the comer piece by the inserts, each insert having a first end being fitably slidable into the hollow ends of the frame members, and each insert having a second end, which is opposite the first end, being fitably slidable into the comer piece. The comer piece is a polyhedron in which at least two faces of the polyhedron include a recess. The second ends of the inserts are fitably slidable into the recesses. The first end and the second end of the insert, the recesses in the comer piece, and the hollow7 ends of each frame member have a polygonal cross-section.

Description

SYSTEM FOR A MODULAR CONSTRUCTION RELATED APPLICATION DATA

[0001] This application claims the benefit of priority of Belgium Patent Application Serial No. BE2025 / 5185, filed on March 28, 2025, and titled “Systeem voor een modulaire constructie” (English translation: System for a Modular Construction), which is incorporated by reference herein in its entirety.FIELD OF DISCLOSURE

[0002] The disclosure relates to a system for modular construction frame.BACKGROUND

[0003] Structural frame members can be connected in various ways to form a frame as part of a structure. Regardless of their manufacturing method and the material from which the frame members are made, the usually elongated frame members must be connected at their ends to other frame members. In this context, it is common practice, for example, to weld the ends of adjacent frame members together in the desired geometric orientation to create a stable comer joint. However, such welding is labor-intensive and time-consuming. To avoid welding and allow the frame members and other structural elements to be reused, a solution such as that described in EP 2678571 can be applied.

[0004] EP 2678571 describes a comer piece comprising a base element consisting of a first and second, both plate-shaped, rectangular wall sections with four sides, an inner side, and an outer side. The two wall sections are connected at a right angle and in one piece at one side, which forms a connecting edge. On the inner side of each wall section, there is a first guide and connecting groove extending parallel to the connecting edge from an adjacent side. In addition, there is at least one plate-shaped, rectangular insert with four sides, an inner side, and an outer side. Two guide and connecting projections extend from the inner side, which are complementary to the first guide and connecting grooves. These projections can be slid into the first guide and connecting grooves parallel to the connecting edge and, when fully retracted, seamlessly secure the attachment to the base element to form a third wall section, which is positioned at a right angle to the first and second wall sections.

[0005] The system only allows for rectangular connections bet een the frame members. Furthermore, fasteners such as screws are recommended for connecting the comer pieces to the frame members. This limits the modularity of the system's various components, as multiple frame components cannot be attached to each other simultaneously.1 Attorney Docket No.: 15516-137WOU1

[0006] The current disclosure aims to address some of the aforementioned problems or disadvantages, focusing on combining the simplest, most minimal, or known system elements possible. This involves eliminating nuts, bolts, and screws as much as possible during the system's modular construction.SUMMARY OF THE DISCLOSURE

[0007] The combination of comer pieces, inserts, reinforcement elements, and pins allows frame members to be secured without fasteners such as screws or bolts. Furthermore, a single fastener, such as the pin, can be used to simultaneously connect multiple frame elements. Furthermore, the system eliminates the need for welding, allows for easy disassembly, meets high stability requirements, requires minimal installation time, and offers flexibility'. By clamping the insert between the comer piece and a hollow end of a frame member, the system's stability is increased by creating a solid connection between the two elements. This minimizes movement or shifting of the comer piece relative to the frame member. Furthermore, it simplifies system installation, as it provides a quick and efficient way to join the components without additional fasteners such as screws or bolts. The angled cross-section prevents rotation between the comer piece and the insert, or between the comer piece and a frame member. The pin is advantageous for connecting the insert to the frame members without additional tools. In addition, the reinforcement element allows the pin to be fixed, thus fixing the comer piece between the frame members.BRIEF DESCRIPTION OF THE DRAWINGS

[0009] For the purpose of illustrating the disclosure, the drawings show aspects of one or more embodiments of the disclosure. However, it should be understood that the present disclosure is not limited to precise arrangements and instrumentalities shown in the drawings, wherein:FIG. 1 shows an exploded view of a framework of a modular construction system in an embodiment of the present disclosure;FIG. 2 shows a detailed representation of a pin according to an embodiment of the present disclosure; andFIG. 3 shows a cross-section top view of a portion of frame members for forming an external comer of a modular construction between two comer pieces.2 Attorney Docket No.: 15516-137WOU1DETAILED DESCRIPTION

[0008] The disclosure concerns a system for modular constructions. The system comprises a frame, the frame being assembled using at least two frame members, each with hollow ends, a comer piece, and inserts. Each frame member can be connected to the comer piece using the inserts. Each insert has a first end that fits snugly into the hollow ends of the frame members. Each insert has a second end, opposite the first end, that fits snugly into the comer piece.

[0009] The term "fits snugly" in this document refers to a mechanism or component designed to fit snugly into a corresponding structure. This ensures stable insertion without rotation or translation in a plane perpendicular to the component's insertion direction into the corresponding structure, without requiring excessive force or adjustment to insert the component into the corresponding structure.

[0010] In one embodiment, the comer piece is a polyhedron. At least two faces of the polyhedron comprise a recess. The second ends of the inserts can be fitted into the aforementioned recesses. By clamping the insert between the comer piece and a hollow end of a frame member, the system is increased in stability by creating a firm connection. This minimizes movement or shifting of the comer piece relative to the frame member. Furthermore, it simplifies system installation, as it provides a quick and efficient way to join the components together without additional fasteners such as screws or bolts.

[0011] In one embodiment, the first and second ends of the insert, the recesses in the comer piece, and the hollow ends of each frame member have a polygonal cross-section. Preferably, the cross-sections for the second ends of the inserts and the recesses in the comer piece have the same polygonal shape, and the cross-sections for the hollow ends of the frame members included in the system and the first end of the insert have the same polygonal shape. More preferably, all the cross-sections have the same polygonal shape. Due to the angular shape of the cross-section, rotation between the comer piece and the insert, or between the comer piece and a frame member, can be prevented.

[0012] In one embodiment, the system includes a reinforcement element. The reinforcement element can be connected to two plates against the insides of the hollow ends of the frame members. Each side of the two plates is connected at an angle identical to the angle formed by two faces of the polyhedron, which comprise a recess. The reinforcement element comprises a third opening on each plate. The reinforcement element helps to form an additional connection between the frame members themselves and, in addition, the comer piece.

[0013] In one embodiment, the system includes a pin having an elongated body and a plate-shaped head. The plate-shaped head is included on one end of the elongated body in a 3 Attorney Docket No.: 15516-137WOU1direction in which the pin extends. The plate-shaped head is lockable into a slot formed in the frame members, the slot being formed between an outer side of the frame members, preferably an outer side of a core of the frame members, and comprising hooks on the outer side of at least each hollow end of the frame members, preferably the outer side of the core. The hooks extend on either side of the first openings and face each other with their free ends. The plate-shaped head is preferably a rectangular plate with rounded comers and concave short sides.

[0014] In a further embodiment, the pin include a locking element. The locking element is located at an opposite end of the elongated body than the plate-shaped head. This is in a direction in which the pin extends. The locking element can be secured against a plate of the reinforcing element.

[0015] In one embodiment, the pin can be secured across first openings in the frame members, through second openings in one of the inserts, and through a third opening in the reinforcing element. The first openings are located on opposite sides of the hollow end of a frame member. The second openings are located on opposite sides of the insert. The third openings are positioned on each of the two plates such that when the comer piece and a hollow end of the frame member are slid together, the first openings, the second openings, and the third openings are aligned. Preferably, the first openings, second openings, and third openings are also aligned when the insert is fitted together in both the hollow end of the frame member and the comer piece.

[0016] The plate-shaped head can be placed in the slot by translation when the slot and the plate-shaped head are aligned along their longitudinal axes. The plate-shaped head placed in the slot cannot be removed from the slot by translation when the slot and the plate-shaped head are substantially misaligned along their longitudinal axes.

[0017] Furthermore, the pin's ability’ to be secured means that the locking element and the elongated body can be placed by translation through opposite first openings, opposite second openings, and a third opening. The elongated body can be placed through the hollow end of the frame member, the insert, and the reinforcement element. The locking element cannot be removed by translation through the third opening if the length of the third opening and the locking element are substantially non-aligned in their longitudinal axis. The lengthwise dimension of the third opening is greater than the widthwise dimensions of the third opening. Preferably, the widthwise direction of the third opening is parallel to the connected sides of the two plates of the reinforcement element. Preferably, the third opening is substantially rectangular or oval in cross-section.4 Attorney Docket No.: 15516-137WOU1

[0018] The advantage of the system is that it eliminates the need for welding, allows for easy disassembly, meets high stability’ requirements, requires minimal installation time, and offers flexibility. Furthermore, a single fastener, such as the pin, can be used to simultaneously connect multiple frame elements, such as the reinforcement element, the frame members, and the comer piece. The pin allows the reinforcement element to be connected to the frame members without additional tools or fasteners such as screws, nuts, or bolts. This is achieved using the flat head and locking element.

[0019] For simplicity7, this document describes only a subsection of the system's framework, comprising a comer formed by two frame members. Therefore, the various elements are usually described in a single form. However, forming a frame requires multiple comers, frame members, inserts, reinforcement elements, and pins. Therefore, a preferred embodiment of the modular construction system consists of interconnected polyhedrons. These polyhedrons are constmcted from multiple frame members, inserts, comer pieces, pins, and reinforcement elements. This is beneficial for the stability7of the modular stmcture and can also provide the necessary strength to support graphic panels, such as LED screens or artistically decorated panels.

[0020] Combining the frame members, inserts, comer pieces, pins, and reinforcement elements within the system is advantageous, based on the advantages mentioned above. Moreover, a modular construction system can be easily assembled with a minimal number of different elements to connect frame members together to form a single stmcture. The stmcture is primarily used in the events industry for stage construction, exhibition stands, and similar projects. It can be used both indoors and outdoors. The system's elements, such as frame members, comer pieces, inserts, and pins, can be frequently reassembled and disassembled.

[0021] In one embodiment, the locking element has a T-shape. The T-shape preferably has a horizontal leg, with a distance between the two free ends of the horizontal leg being less than a largest dimension of a cross-section of the elongated body, so that it can be translated through the openings. Preferably, the ratio between the two free ends of the horizontal leg of the T-shape and the largest dimension of a cross-section of the elongated body is at most seveneighths, more preferably at most three-quarters. Preferably, the ratio is at least two-thirds, preferably at least one-half. This allows the anchoring element to be translated through the first, second, and third openings.

[0022] In a preferred embodiment, the pin comprises an anchoring element. The anchoring element has a T-shape. The T-shape is located on the opposite end of the elongated body and thus between the opposite end of the elongated body and the locking element. The distance 5 Attorney Docket No.: 15516-137WOU1between the outer sides in which the first openings are located is the same distance as that between the facing sides of the plate-shaped head on the one hand and a horizontal leg of the T-shape on the other. The vertical leg of the T-shape has a free end directed towards the plateshaped head. Opposite sides of the frame member between which the elongated body is positioned can be clamped between the facing sides of the plate-shaped head and the horizontal leg of the T-shape when the pin is in a lockable position. The anchoring element can serve as an additional safeguard to prevent movement between the aforementioned frame member and the reinforcement element. The horizontal leg of the T-shape is preferably positioned parallel to the plate-shaped head. Preferably, the distance between the two free ends of the horizontal leg of the T-shape is smaller than the largest dimension of a cross-section of the elongated body. This allows the anchoring element to be translated through the first, second, and third openings. Preferably, the plate-shaped head extends in the same direction as the horizontal leg. This allows both parts of the pin to simultaneously secure the pin in the frame member.

[0023] In a further embodiment, a cross-section of the vertical leg of the T-shape is smaller than the cross-section of the elongated body. Preferably, the ratio of the cross-section of the vertical leg of the T-shape to the cross-section of the elongated body is at most seven-eighths, more preferably at most three-quarters. Preferably, the aforementioned ratio is at least two-thirds, preferably at least one-half. This allows the horizontal leg to have a sufficient length to be secured relative to the first openings.

[0024] In one embodiment, the first openings have an elliptical or rectangular shape, with or without rounded comers. Preferably, the first openings are round.

[0025] In one embodiment, the second openings have an elliptical or rectangular shape, with or without rounded comers. Preferably, the second openings are round.

[0026] In a preferred embodiment, the pin includes a grip. The grip is coupled to the plateshaped head in the extension of the elongated body, in a direction away from the elongated body. This allows the pin to be gripped for rotation and to hook onto the hooks on the frame member at least with the plate-shaped head.

[0027] In an alternative embodiment, the pin includes an attachment element. The attachment element is coupled to the plate-shaped head in the extension of the elongated body, in a direction away from the elongated body. Preferably, the attachment element is a ring, a magnet, a rod comprising a slot with a fold-out fin, or a coupling for connecting an anchoring element of another pin. This is advantageous because it allows the pin to be used for attaching panels or other accessories to the frame member, among other things. Alternatively, multiple6 Attorney Docket No.: 15516-137WOU1parallel frame members can be connected to each other. This is the case, for example, if a frame comer is formed by multiple comer pieces next to and attached to each other.

[0028] In one embodiment, the pin includes a shaft coupled to the locking element. The shaft extends from the locking element to an end of the pin away from the end to which the locking element is coupled, along the direction of pin extension. The locking element is rotatable by the shaft. The shaft is rotatable in a plane perpendicular to the direction of extension of the elongated body. This allows the locking element to be secured separately from securing the frame member. Preferably, only the horizontal leg of the T-shape of the locking element is rotatable. More preferably, both parts of the horizontal leg, divided by the vertical leg of the T-shape, have different cross-sectional thicknesses. The thickness is measured along the direction of pin extension.

[0029] The direction in which the pin and the elongated body extend are the same.

[0030] In one embodiment, the polyhedron of the comer piece is a cube. Preferably, the cube's ribs are at least as long as one side of an outer dimension of the cross-section of each frame member. If the comer piece has sides smaller than the outer dimension of the crosssection of each frame member, forces acting on the comer piece from the frame members may be unevenly distributed. If the comer piece has sides larger than the outer dimension of the cross-section of each frame member, a complex reinforcement element is necessary. This detracts from the uniformity of the various elements in the system. Furthermore, the reinforcing effect is reduced if a comer is formed additionally for the reinforcement element. Preferably, the ribs have a length between 20 mm and 200 mm, more preferably between 35 mm and 170 mm, and even more preferably between 50 mm and 150 mm. The ribs must be of sufficient length so that the frame member can withstand sufficient forces without deforming. These forces can come from the weight of the graphic panels or from other components of the modular structure.

[0031] In one embodiment, the polygonal cross-sections of the first end of the insert and of the hollow ends of each frame member have four comers. Alternatively, the polygonal crosssection can have five corners, preferably six corners, and more preferably eight comers.

[0032] In one embodiment, the polygonal cross-sections of the second end of the insert and of the recesses in the comer piece have four comers. Alternatively, the polygonal crosssection can have five comers, preferably six comers, and more preferably eight comers.

[0033] The angular shape of the cross-section prevents rotation between the comer piece and the insert, or between the comer piece and a frame member. Using a polygon with four comers allows for a simple frame member design.7 Attorney Docket No.: 15516-137WOU1

[0034] In one embodiment, multiple comer pieces are positioned next to each other. Preferably, the multiple comer pieces next to each other have a combined longest length between 40 mm and 300 mm, more preferably between 70 mm and 200 mm, and even more preferably between 100 mm and 150 mm. The combined longest length is such that multiple parallel-positioned frame members can be attached to the comer piece. This can enhance the strength of the modular structure. It also allows multiple graphic panels to be connected adjacent to each other in an extended line or at an angle. Preferably, the connection is made at an angle to the edges of adjacent panels.

[0035] In an alternative embodiment, the pin comprises only the anchoring element and the plate-shaped head. The anchoring element and the plate-shaped head are positioned at opposite ends of the elongated body. This can be advantageous for connecting multiple parallel frame members.

[0036] In one embodiment, multiple frame members can be connected in parallel with one or more additional frame members at an angle. The angle is preferably between 45° and 135° relative to a plane parallel to a first plane. The first plane is formed by a circumferential side of one of the polygonal cross-sections of the multiple parallel connectable frame members and a direction in which the multiple parallel connectable frame members extend. More preferably, all parallel connectable frame members have the same polygonal cross-section. This allows freedom in the shape and / or construction of the modular structure.

[0037] More preferably, the aforementioned angle is between 60° and 120°, more preferably between 75° and 105°, even more preferably between 80° and 100°, and even more preferably between 85° and 95°. These angles are suitable for withstanding sufficient force without deforming the structure. Moreover, achieving these angles allows for greater freedom in the shape and / or construction of the modular structure.

[0038] In one embodiment, the system includes4 one or more footrests. The footrests can be connected to the comer piece. Preferably, the connection to the comer piece is possible in one of the recesses in the comer piece. Preferably, one of the recesses is configured to receive the footrest. More preferably, the recess is configured to receive the footrest by screwing the footrest into the comer piece, by clamping the footrest into the comer piece, or by means of pins or locking pins. The adjustable footrests can be placed under the base of the structure. The footrests can adjust the height of the base of the stmcture. This allows for leveling on uneven surfaces.

[0039] In one embodiment, the second end of the insert has a smaller cross-sectional area than a cross-sectional area of the first end of the insert. Preferably, a ratio of a circumference 8 Attorney Docket No.: 15516-137WOU1of the second end of the insert to a circumference of the first end of the insert is at most 0.85, more preferably at most 0.75, more preferably at most 0.65, more preferably at most 0.55, more preferably at most 0.45. The ratio is preferably at least 0.35. Due to the ratio, a surface area that can be accommodated in the angle piece is sufficiently large so that force can be exerted from the insert on the angle piece, and vice versa, without deforming the second end of the insert. The circumferences provide a measure for the cross-sectional areas of the insert.

[0040] In one embodiment, the second end of the insert has a shorter length than the first end of the insert in the direction in which the insert extends. Preferably, the ratio of the length of the second end of the insert to the length of the first end of the insert is at least 0.4, preferably at least 0.5, more preferably at least 0.6, even more preferably at least 0.8. This ratio is preferably at most 1. This ratio ensures that the insert can be accommodated in the angle piece with sufficient length to allow forces to be applied from the insert to the angle piece, and vice versa, without deforming the second end of the insert. Furthermore, this prevents the insert from moving out of a recess in the angle piece when subjected to forces.

[0041] In one embodiment, the insert comprises a through-bore along an axis between the first and second ends of the insert. Preferably, the through-bore in the first end has a larger diameter than the through-bore in the second end of the insert. More preferably, the ratio of the diameter of the second end of the insert to the diameter of the first end of the insert is at most 0.7, preferably at most 0.6, more preferably at most 0.5, even more preferably at most 0.4. The ratio is preferably at least 0.3. Preferably, the through-bore in the second end of the insert and a recess in the angle piece also comprise threads. This allows the pin to be screwed in, thus enabling the insert and the angle piece to be fixed in place. In a specific combination, the pin has a grip, allowing the modular structure to be assembled without tools such as screwdrivers or Allen keys.

[0042] In one embodiment, the insert is substantially beam-shaped. Grooves are present on sides perpendicular to the first and / or second end of the insert. Preferably, the grooves extend from the first end to the second end of the insert. Preferably, the grooves are present on each longitudinal side of the beam shape. The longitudinal sides are sides where the edges of the longitudinal sides are oriented parallel to the direction in which the beam shape extends.

[0043] In one embodiment, the grooves are centrally positioned on the longitudinal sides of the beam shape, along the edges that are oriented perpendicular to the edges of the longitudinal sides and parallel to the direction in which the beam shape extends. Preferably, the depth of the grooves is at most 10%. more preferably at most 5%, of the length of an edge9 Attorney Docket No.: 15516-137WOU1perpendicular to the edges of the longitudinal sides that are oriented parallel to the direction in which the beam shape extends and is centrally positioned.

[0044] Preferably, the width of the grooves is at least 75% of the length of the aforementioned edge perpendicular to the aforementioned longitudinal sides, more preferably at least 80%, even more preferably at least 85%, and even more preferably at least 90%. This will reduce the resistance when the insert slides into a hollow end of a frame member or a recess in the comer piece compared to when a solid side of the longitudinal sides is against the hollow end of a frame member or the recess in the comer piece. Furthermore, this provides additional reinforcement of the insert in the direction in which the comer piece extends.

[0045] In one embodiment, the first end of the insert is fully receivable in a hollow' end of a frame member. Preferably, the second end of the insert is fully receivable in a recess in the comer piece. Preferably, the insert is fully receivable in a hollow end of each frame member in combination with one of the recesses in the comer piece. This ensures a strong and stable connection between the comer piece and the aforementioned frame member. This allows forces acting on the aforementioned frame member and the comer piece to be effectively transferred. Consequently, structural integrity can be increased. Furthermore, installation is simplified, as the insert can be slid into the correct position in the comer piece and the aforementioned frame member without much additional adjustment.

[0046] In one embodiment, the insert comprises a through-hole on each longitudinal side. Preferably, the through-hole is perpendicular to a plane in which a longitudinal side lies. Preferably, the through-hole is positioned in the first end of the insert. The through-hole is advantageous because the pin can be placed through the insert. The through-holes on the longitudinal sides are located between the second openings.

[0047] In one embodiment, the two plates of the reinforcement element are connected in an L-shape to form a comer. The comer is preferably a right angle. This significantly increases structural stability and strength. It ensures effective transfer of forces between the connected frame members, enhancing the durability of the modular structure. Furthermore, the reinforcement element provides a precise and secure fit to the comer piece and the frame members, preventing movement and loosening. This design simplifies assembly and provides reliable support for the modular structure.

[0048] In one embodiment, the tw o plates of the reinforcement element with free edges are connected by a plate. The free edges are edges opposite the right angle. Preferably, the plate with the free edges includes an opening. The opening preferably has the same diameter as the openings in the sides of the frame members. This design increases the stmctural strength of the 10 Attorney Docket No.: 15516-137WOU1structure by effectively distributing the force across the three plates. The opening also allows for the installation of reinforcement cables, which are often tensioned in a cross formation between opposite comers of a quadrilateral. If the opening has the same diameter as that in the frame members, the number of different elements in the system can be minimized and the ease of installation can be further enhanced. Furthermore, the opening can also provide the possibility of suspending other structural elements from a comer to which the reinforcement element is connected.

[0049] In one embodiment, the two plates of the reinforcement element are rectangular plates that connect two triangular plates. The triangular plates comprise a right angle. Preferably, the two rectangular plates are connected at the adjacent sides of the right angle of the two triangular plates. This design increases the structural strength of the structure by effectively distributing the force across the two rectangular plates. Furthermore, the triangular plates protect the pin heads from external impact and damage to the pins. The pins are each fixed to a different straight plate on a frame member.

[0050] In a preferred embodiment, the third openings are located on a projection on each plate of the reinforcing element. Preferably, the projections face away from each other and are located on the outer sides of the plates relative to the right angle. The locking element of the pin can be secured in the projections of the reinforcing element. This ensures that at least the comer piece is clamped between the inserts, which are fixed to the frame members. Preferably, the projection can be slid into the groove of the frame member to provide additional security against movement of the reinforcing element relative to the aforementioned frame member.

[0051] In one embodiment, the frame members have openings at the hollow ends. Preferably, there are multiple openings on at least two opposite circumferential sides of the frame members, more preferably on all circumferential sides of the frame members. Preferably, the multiple openings have the same cross-section, and preferably, the multiple openings are round in shape. This is advantageous for allowing fasteners or other connections to be made to the frame members.

[0052] In one embodiment, the system comprises one or more fasteners. The angle piece and the inserts can be secured together by means of the fasteners. Each of the fasteners, when securing the angle piece and the insert, extends from the first end of the insert, through the insert, and from the second end of the insert to at least partially into the angle piece. Preferably, the fasteners for securing the insert and the angle piece are coupling pins. This allows for good transmission of forces between the insert and the angle piece.11 Attorney Docket No.: 15516-137WOU1

[0053] In one embodiment, the system includes a pin. The pin can be secured in the comer piece through a hole in the insert in a direction between the first and second ends of the insert. The pin preferably has a thread at a first end for tightening and loosening the pin in the comer piece. A second end of the pin comprises a grip for gripping and tightening the pin in the comer piece. This embodiment is preferably used in combination with the comer piece, the insert, the pin, and the frame members.

[0054] Alternatively, the pin preferably includes a clamping mechanism at a first end. The clamping mechanism can preferably be operated by pressing a second end of the pin in or out. When depressed, the movable parts of the clamping mechanism will be extended transversely relative to the direction in which the insert extends. The first end of the pin encloses the movable parts. When not depressed, the movable parts are retracted relative to the direction in which the insert extends. Preferably, when depressed, the movable parts are extended transversely into a space wider than the largest diameter of the polygonal cross-section of the recesses in the comer piece. This space is preferably enclosed by the comer piece. This provides additional anchoring of the comer piece to a frame member. This has a positive effect on the stability and dimensional stability of the modular construction.

[0055] In one embodiment, the coupling pin and the pin are the same element of the system. Preferably, the pin and the pin have a round cross-section. Preferably, the coupling pin or pin includes a plate-shaped head at a first end, and a slot is located in a second end of the pin or coupling pin. More preferably, the slot extends from the second end to the first end, but not as far as the first end. Preferably, the slot extends across an entire cross-section of the pin or coupling pin. A hinged element is incorporated in the slot. In a closed position, the hinged element is placed completely within the slot, without the hinged element protruding beyond the circumference of the pin or coupling pin. The hinged element extends transversely to the direction in which the slot in the pin or pin extends in an open position. This allows the insert to be fixed to the comer piece or a frame member by the hinged element.

[0056] In a further embodiment, a fin is coupled to the hinged element. The fin is positioned transversely to the direction in which the hinged element extends, in a plane parallel to the plane in which the slot extends. Preferably, in the open position of the hinged element, the fin is positioned within the perimeter of the slot. The fin is advantageous because it allows the pin or coupling pin to be fixed to the frame member or in the comer piece. The fin prevents the hinged element from shifting. This is possible if there is a protmsion in the slot behind which the fin can be secured.12 Attorney Docket No.: 15516-137WOU1

[0057] The various pin and / or coupling pin designs are advantageous, so that the modular construction can be built without tools such as screwdrivers or Allen keys.

[0058] In one embodiment, the aforementioned fasteners are accommodated by the pin using a click system and / or a rotation system. The click system and / or rotation system is integrated into the pin and can be secured in a lock to secure the pin. This allows the pin to be connected to the lock. This is additionally beneficial for the stability and strength of the modular construction and allows multiple parallel frame members to be connected together.

[0059] In one embodiment, the lock comprises a flat head and a sleeve. The flat head can be placed in a coupled position with the pin against an outer wall of a frame member. The sleeve can be slid into the aforementioned opening of the frame member with a hollow end. This is advantageous for firmly securing the pin and the insert to the aforementioned frame member.

[0060] In one embodiment, the lock's tube extends through opposite openings in multiple adjacent frame members. The multiple adjacent frame members can be held together by the connected pin in the tube. Multiple adjacent comer pieces allow for the connection of multiple parallel frame members, and additional anchoring between the multiple parallel frame members may be required.

[0061] In one embodiment, the frame members, the comer piece, the reinforcement element and the insert are made of aluminium or an alloy thereof.

[0062] In one embodiment, the frame members and the comer piece are made of an aluminum-magnesium-silicon alloy. Preferably, the magnesium content of this alloy is between 0.4 wt % and 2.2 wt %, more preferably between 0.6 wt % and 1.7 wt %, and even more preferably between 0.8 wt % and 1.2 wt %.

[0063] Preferably, the weight percentage of silicon in said alloy is between 0.1 wt % and 1.2 wt %, more preferably between 0.2 wt % and 1.0 wt %, more preferably between 0.4 wt % and 0.8 wt %.

[0064] The aluminum alloy, comprising magnesium and silicon, offers high strength while remaining lightweight. This is important for modular construction elements, as it facilitates rapid assembly and transport while ensuring sufficient strength. This alloy has excellent corrosion resistance to atmospheric and marine environments, extending the service life of these elements. Furthermore, this alloy is easy to machine and weld, simplifying fabrication and assembly. This also results in a durable material for modular construction. Furthermore, these alloys are easily anodized, further increasing corrosion resistance.13 Attorney Docket No.: 15516-137WOU1

[0065] In a further embodiment, the alloy comprises copper. Preferably, the weight percentage of copper in the alloy is between 0.05 wt % and 0.80 wt %, more preferably between 0.10 wt % and 0.60 wt %, and even more preferably between 0.15 wt % and 0.40 wt %. This further strengthens the alloy, so that, for example, the frame members will not deform under forces experienced during normal use.

[0066] In a further embodiment, the aluminum alloy is anodized, which further increases corrosion resistance.

[0067] In one embodiment, the pin and / or lock are made of one of the above-mentioned alloys. Preferably, the alloy is the same as the alloy from which the insert is made.

[0068] In one embodiment, the footrest, pin, and lock are made of stainless steel or an alloy thereof. Preferably, the stainless steel alloy comprises 5 wt % to 25 wt % silicon, more preferably 6 wt % to 20 wt %, and even more preferably 7 wt % to 15 wt %.

[0069] Preferably, said alloy additionally comprises 0.1 wt % to 0.9 wt % magnesium, more preferably 0.2 wt % to 0.7 wt %, more preferably 0.3 wt % to 0.5 wt %.

[0070] This alloy is advantageous for its corrosion resistance. Furthermore, the alloy with silicon and optionally magnesium offers good castability for molding, high strength, and good corrosion resistance.

[0071] The disclosure further relates to an outer comer of a modular construction comprised between two comer pieces.

[0072] In one embodiment, the comer of the modular structure, formed by frame members between the system's comer pieces, comprises three parallel frame members positioned in an L-shape relative to each other. Because the comer is an external comer of the modular structure, it must withstand more forces than a frame member in the center of the aforementioned structure. This allows the frame members in the comer to resist bending and twisting. Furthermore, graphic panels can be attached to the structure without overlapping mounting locations on the comer frame members.

[0073] If a frame member is not further specified, it means a frame member that can be connected betw een two comer pieces as previously described in the first aspect.

[0074] In one embodiment, the polygonal cross-sections of the three aforementioned L-shaped frame members have a quadrangular cross-section at the comer, preferably a square cross-section. This allow s the frame members to be connected parallel to each other, and results in a simpler connection between the three frame members.

[0075] In one embodiment, the system includes a spacer frame member. A spacer frame member is positioned between the facing sides of several of the three frame members in the 14 Attorney Docket No.: 15516-137WOU1comer. Preferably, the spacer frame members and the three parallel frame members he flush against each other. This prevents the three frame members from being positioned unevenly relative to each other. Furthermore, graphic panels can be connected flush to each other without being connected to an outer comer of the L-shape of the comer. This reduces the risk of damage to the edges of the graphic panels.

[0076] In one embodiment, the spacer frame member has the same width and half its length relative to a frame member cross-section. The length and width of the frame member cross-section encompass the hooks on an outer side of the frame member. Hooks are present within the length of the spacer frame member. Preferably, the hooks on a rectangular crosssection are positioned at the comers of the rectangular shape. The hooks are preferably L-shaped. with a first free end positioned at the comers and a second free end facing each other and parallel to the longest sides of the rectangular cross-section.

[0077] In a further embodiment, the aforementioned rectangular cross-sections include fourth openings, centrally positioned relative to the width of the cross-section of the spacer frame member. Preferably, the fourth openings are distributed along the sides where the spacer frame member extends.

[0078] The fourth openings and the hooks allow you to connect the frame members and the spacer frame members together using pins from the first aspect.

[0079] In one embodiment, the hooks comprise a U-shape that closes the L-shape along an outer side of the spacer frame member, creating a cavity. The cavities formed by the four hooks increase the strength of the spacer frame member. The hooks are L-shaped, with a comer between one leg of the L-shape and the other leg of the L-shape connected to a first free end of a first leg of the U-shape, and a second leg of the U-shape connected centrally to a side of the rectangular cross-section with the shortest length.

[0080] In a further embodiment, leveling frame members are positioned against the two frame members that are not positioned at a comer of the L-shape. Preferably, the leveling frame members are each positioned against sides that are perpendicular to the side where a spacer frame member rests on the two aforementioned frame members. The leveling frame members are advantageous for reinforcing the comer.

[0081] In one embodiment, the system includes a locking piece. The frame member, positioned between the two spacer frame members at a comer of the L-shape, and both spacer frame members can be protected with a locking piece. The protected portion is located along the outside comer of the L-shape. This prevents dirt or other objects from getting between the15 Attorney Docket No.: 15516-137WOU1frame members. In combination with the spacer frame members, this is beneficial for protecting the graphic panels connected to the frame members from damage.

[0082] In one embodiment, a cross-section of the leveling frame member has two U-shapes positioned with their lower legs touching. Preferably, L-shaped hooks on the free ends of the U-shapes are connected to a free end of the L-shape. The free ends of the L-shapes face each other in the direction in which the U-shapes extend. Preferably, the free ends of the two U-shapes are connected by a plate. This also connects the plate to the connected ends of the L-shape.

[0083] In a further embodiment, the two U-shaped cross-sections comprise fifth openings in common, centrally positioned relative to the width of the leveling frame member's crosssection. Preferably, the fifth openings are distributed along the length of the leveling frame member. The fifth openings and the hooks allow the frame members and the leveling frame members to be connected to each other using the pins from the first aspect.

[0084] In one embodiment, the leveling frame member comprises a cavity formed by an L-shape. The L-shape comprises a longest leg and a shortest leg. The shortest leg is connected to a comer of one of the four L-shapes of the hook and extends parallel along the plate connecting the free ends of the U-shape to beyond an opposite hook, connected to a free end of the same U-shape. Preferably, the L-shape, forming the cavity, is connected by a connection to the plate connecting the free ends of each of the U-shapes. This provides additional reinforcement to the leveling frame member.

[0085] In one embodiment, two of the leveling frame members are located on the outside of the comer, with one side against the closing piece. The two leveling frame members on the inside of the comer meet at their edges to form a leveling comer. These leveling frame members are beneficial for reinforcing the comer and protecting the edges of graphic panels.

[0086] In one embodiment, the closing element comprises two leveling frame members connected by two curved comer plates. A first comer plate connects the comers of the L-shaped hooks. These two hooks are located furthest from the free end of the longest leg of the L-shape to form the cavity. A second corner plate connects the comers of the L-shaped hooks. These two hooks are positioned on the same U-shape as the hooks to which the first comer plate is connected. This creates fixed distances so that pins can pass through the openings in the frame members and through the fifth openings of the leveling frame members, allowing the closing element to be connected to the frame member in the comer of the L-shape. Preferably, the second comer plate comprises an E-shape on an outer side to reinforce and support the shape retention of the second comer plate.16 Attorney Docket No.: 15516-137WOU1

[0087] In one embodiment, the three frame members can be connected to each other, the spacer frame members, the leveling frame members, or the closing piece by means of pins, preferably by pins coupled to locks.

[0088] In a preferred embodiment, the first, second, third, fourth, and fifth openings are equal in diameter. This allows for easy attachment of pins.

[0089] In one embodiment, the materials used for the frame members are the same as for the spacer frame members, the leveling frame members, or the closing piece. This is beneficial for the same degree of expansion and resistance to the same force, preventing deformation.

[0090] It will be understood that a comer formable using a system comprising a comer piece according to the first aspect is part of the modular construction, which also includes a comer formable using a comer system according to the second aspect. This allows embodiments according to the first aspect to be used for embodiments according to the second aspect, and vice versa.

[0091] The present disclosure will now be described in more detail with reference to figures.

[0092] Figure 1 shows an exploded view of a frame (1) of a modular construction system in an embodiment of the present disclosure.

[0093] The system comprises a frame (1), the frame (1) including at least two frame members (2), each frame member (2) having at least hollow ends, a comer piece (3) and inserts (4). Each frame member (2) can be connected to the comer piece (3) by the inserts (4). Each insert (4) can be slid into the hollow ends of the frame members (2) with a first end (12). Each insert (4) can be slid into the comer piece with a second end, which is opposite to the first end (12).

[0094] The comer piece (3) is a cube with a square recess in all six faces of the cube. The cube may have edges with a length of, for example, 50 mm. Alternatively, the edges can have a length betw een 20 mm and 200 mm. The comer piece (3) can alternatively also be a different polyhedron. The second ends (13) of the inserts (4) are fitable into the recesses (8) of the comer piece. The first end (12) of the insert, the second end (13) of the insert (4), and the hollow ends of each frame member (2) have a square cross-section. Alternatively, the cross-sections for the second end (13) of the inserts (4) and the recesses (8) in the comer piece (3) have the same polygonal shape, and the cross-sections for the hollow ends of the frame members (2) included in the system and the first end (12) of the insert (4) have the same polygonal shape. Alternatively, several comer pieces (3) are formed next to each other into a whole with a beam17 Attorney Docket No.: 15516-137WOU1shape or a cube shape. This allows several frame members (2) to be connected parallel next to each other.

[0095] The insert (4) has a different cross-sectional area at both ends. The second end (13) has a smaller cross-sectional area than a cross-sectional area of the first end (12). The second end (13) of the insert (4) has a shorter length than a length of the first end (12) of the insert (4) in a direction in which the insert (4) extends. Alternatively, the insert (4) comprises second openings (11) which form a through-bore and are positioned along an axis between the first and second ends. The through-bore has a larger diameter in the first end (12) than the through-bore in the second end (13) of the insert. This allows a pin to be secured through the through-bore to the angle piece (3), thereby enabling the angle piece (3) and the insert (4) to be connected. The insert (4) is substantially beam-shaped. Grooves are present on sides perpendicular to the first and / or second ends of the insert (4). The grooves extend from the first end (12) to the second end (13) of the insert. The grooves are present on each longitudinal side of the beam form. The grooves are centrally positioned on the longitudinal sides of the beam form along edges perpendicular to the edges of the longitudinal sides oriented parallel to a direction in which the beam form extends. The first end (12) of the insert (4) is fully receivable in a hollow end of a frame member. The second end (13) of the insert (4) is fully receivable in a recess (8) of the comer piece. This allows the insert (4) to be fully receivable in a combination of a hollow end of each frame member (2) with one of the recesses (8) of the comer piece (3), allowing the frame member (2) and the comer piece (3) to abut against each other.

[0096] The frame members (2) include first openings which are contained in opposite sides of hollow ends of the frame members (2). Optionally, the frame members (2) include first openings (6) on sides distributed on all sides in a longitudinal direction in which the frame members (2) extend. The first openings (6) are distributed over an entire length in which the frame members (2) extend. The frame members (2) include hooks (7) on at least each hollow end of the frame members (2). The hooks (7) extend on either side of the first openings (6). The hooks (7) are free-ended and facing each other. The frame members (2) have a square cross-section with the hooks (7) positioned on the square cross-section.

[0097] The system includes pins (5). The pin include at least a plate-shaped head and an elongated body and a locking element. Optionally, the pin includes an anchoring element. For each connection of the angle piece (3) to a frame member (2), a pin (5) can be fixed transversely through the first openings (6) of the frame members (2) and through the second openings (11) of the inserts (4). The second openings (11) are included in opposite sides of the inserts (4). The pin (5) can be positioned through the insert (4), transversely to a direction between the first 18 Attorney Docket No.: 15516-137WOU1end and the second end (13) of the insert. Preferably, pins (5) are used in the system as described in Figure 2.

[0098] The system comprises a reinforcement element (9). The reinforcement element (9) can be connected to two plates against the insides of the hollow ends of the frame members (2), whereby the reinforcement element (9) comprises third openings, whereby the pin (5) can be secured through the third openings. The two plates of the reinforcement element (9) are connected to each other in an L-shape to form a comer. Preferably, the comer is a right angle. The two plates are rectangular plates which are connected to each other by means of two triangular plates. The triangular plates comprise a right angle. Preferably, the two rectangular plates are connected to each other on the adjacent sides of the right angle of the two triangular plates. Alternatively, the two plates are connected to each other with a plate by means of free edges. The plate is substantially rectangular in shape. The free edges are edges which are opposite to the right angle.

[0099] A protrusion (10) may be included on each of the plates of the reinforcement element (9). The protrusions (10) and are directed away from each other and are positioned on the outer sides of the plates relative to the right angle. The hook (7) of the pin (5) is lockable into the protrusion (10) and of the reinforcement element (9).

[0100] Optionally, the system includes pins. A pin can be secured in the comer piece (3) through a hole in the insert (4) in a direction between the first and second ends (13) of the insert. The pin preferably includes threads at a first end (12) for screwing and unscrewing the pin in the comer piece. A second end (13) of the pin includes a grip for gripping and screwing the pin into the comer piece. Alternatively, the pin can have a design like the pin (5) with the difference that the locking element is absent. In addition, the comer piece (3) includes a cavity for receiving an anchoring element included on the pin. This allows clamping between the insert (4) and comer piece (3) as an additional security measure for fixation between all elements of the frame (1).

[0101] In one embodiment, the frame members (2), the comer piece, the reinforcement element (9), and the insert (4) are made of an aluminum-magnesium-silicon alloy or another aluminum alloy. Preferably, the frame members (2). the comer piece, the reinforcement element (9), and the insert (4) are anodized. The pin (5) may be made of stainless steel or an alloy thereof.

[0102] This modular design allows for quick and efficient assembly of components without additional fasteners such as screws or bolts.19 Attorney Docket No.: 15516-137WOU1

[0103] Figure 2 shows a detailed representation of the pin according to an embodiment of the present disclosure.

[0104] The pin (5) comprises a plate-shaped head (14) and an elongated body (23). The plate-shaped head (14) is rectangular with rounded comers and rounded shortest sides. The pin (5) comprises a grip (15) coupled to the plate-shaped head (14) so that the pin (5) can be rotated to engage with hooks included on the frame member (2). The pin (5) comprises an anchoring element (16). More specifically, the anchoring element (16) has a T-shape incorporated on an opposite end of the plate-shaped head (14). A shortest leg of the T-shape is positioned parallel to the plate-shaped head (14). This allows the plate-shaped head (14) and the anchoring element (16) to engage the pin (5) with hooks on opposite sides of the frame member. The pin (5) further comprises a locking element (17) which is positioned at the junction point of the shortest leg and a longest leg of the T-shape on the opposite end of the elongated body (23). The locking element (17) extends with each free end perpendicular to the direction in which the pin (5) extends. The free ends are in line with each other. The locking element (17) is rotatable by means of a shaft (18) incorporated in the handle (15).

[0105] The pm (5) can be secured as the elongated body (23), a locking element (17) and an anchoring element (16) translate through the first openings (6) of the frame member (2) (see Figure 1), second openings (11) of the insert (4) (see Figure 1) and a third opening (10) of the reinforcement element (9) (Figure 1). Afterwards, a rotating movement is performed with the grip (15) to secure the plate-shaped head (14) and the anchoring element (16) on the frame members between an outer side of the frame members and the hooks (7) (Fig. 1). Then, by means of the shaft (18), the locking element (17) is secured by rotation, whereby the reinforcement element (9) is clamped against the frame members (2).

[0106] Figure 3 shows a cross-section in top view of portions of frame members for forming an external comer of a modular construction comprised between two comer pieces.

[0107] The system comprises an external comer (19) of the modular construction formed by frame members (2) between comer pieces of the system. The external comer (19) is formed by an assembly of three parallel positioned frame members (2) w hich are positioned in an L-shape with respect to each other. The frame members (2) are as described in Figure 1.

[0108] The system comprises two spacer frame members (20). Each one has a spacer (20) positioned between facing sides of several of the three frame members (2) of the comer. The spacers (20) and the three parallel frame members (2) are positioned in such a way that the frame members (2) lie parallel to the spacers (20) and abut against each other.20 Attorney Docket No.: 15516-137WOU1

[0109] The system includes a closing piece (21). The frame member (2) positioned between the two spacers (20) at a comer of the L-shape, and both spacers (20), can be shielded with a closing piece (21).

[0110] The system includes leveling members (22). Leveling members (22) are positioned against the two frame members (2) that are not positioned at a comer of the L-shape. The leveling members (22) are each positioned against sides perpendicular to the side on which a spacer (20) rests on the two said frame members (2).[OHl] The leveling members (22) also rest against an outside of the comer, with one side against the closing piece (21). The two of the leveling members (22) on an inside of the comer touch each other with edges to form a leveling comer.

[0112] The three frame members (2). the spacers (20). the leveling members (22), or the closing piece (21) are connected to each other by means of pins (5). Optionally, the pins correspond to pins (5) as described in Figure 2.

[0113] The materials used for the frame members (2) are preferably the same as for the spacer s (20), the leveling members (22), or the closing piece (21). Optionally, this is in accordance with the materials used in Figure 1.

[0114] Quoting numerical intervals through the endpoints includes all integers, fractions, and / or real numbers between the endpoints, including these endpoints.21 Attorney Docket No.: 15516-137WOU1

Claims

What is claimed:

1. A system for modular construction of a frame, comprising:at least two frame members, each frame member having at least hollow ends, a comer piece, and inserts, wherein each frame member is configured to be connected to the comer piece via the inserts, wherein each insert can be fitted into the hollow ends of the frame members with a first end, wherein each insert can be fitted into the comer piece with a second end, which is opposite the first end;a reinforcement element; anda pin having an elongated body, a plate-shaped head and a locking element, the plateshaped head being comprised on one end of the elongated body in a direction in which the pin extends, the locking element being comprised on an opposite end of the elongated body in a direction in which the pin extends, the plate-shaped head being fixable in a slot comprised in the frame members, the slot being formed between an outer side of the frame members and hooks comprising on the outer side of at least each hollow end of the frame members, the hooks extending on either side of the first openings and facing each other with free ends, the locking element being fixable against a plate of the reinforcement element,wherein the comer piece is a polyhedron, at least two faces of the polyhedron comprising a recess, the second ends of the inserts being fitably slideable into said recesses;wherein the first end and the second end of the insert, the recesses in the comer piece, the hollow ends of each frame member have a polygonal cross-section; coupled with two plates against the inner sides of hollow ends of the frame members, wherein the two plates are each connected to each other with one side at the same angle as the angle formed by two faces of the polyhedron which comprise a recess, wherein the reinforcement element comprises a third opening on each plate; wherein the pin is fixable transversely through first openings of the frame members, through second openings of one of the inserts and through a third opening in the reinforcement element, wherein the first openings are on opposite sides of the hollow end of the frame members, wherein the second openings are on opposite sides of the insert, wherein the third openings are positioned on each of the two plates such that when the comer piece and a hollow' end of a frame member are slid against each other, the first openings, the second openings and the third openings are aligned;22 Attorney Docket No.: 15516-137WOU1wherein the plate-shaped head is configured to be placed in the slot by translation when the slot and the plate-shaped head are aligned in terms of their longitudinal axis, wherein the plate-shaped head when placed in the slot cannot be removed from the slot by translation when the slot and the plate-shaped head are substantially not aligned in terms of their longitudinal axis; andwherein the locking element and the elongate body are placeable through a translation through first openings, second openings and a third opening, wherein the elongate body is placeable through a hollow end of the frame member, the insert and the reinforcement element, and wherein the locking element is not removable through a translation through the third opening when the third opening with a longitudinal direction and the locking element are substantially non-aligned with respect to their longitudinal axis.

2. The system according to claim 1, wherein the pin includes an anchoring element, the anchoring element having a T-shape, the T-shape being between the opposite end of the elongated body and the locking element, wherein a distance between outer sides in which the first openings are comprised is the same as a distance between mutually facing sides of the plate-shaped head and a horizontal leg of the T-shape, and wherein opposite sides of the frame member between which the elongated body is positioned are clampable between mutually facing sides of the plate-shaped head on the one hand and the horizontal leg of the T-shape on the other hand.

3. A system according to claim 1 or 2, wherein the pin includes a grip, the grip being coupled to the plate-shaped head in the extension of the elongated body in a direction away from the elongated body.

4. A system according to any one of the preceding claims 1 to 3. wherein the pin comprises an axis coupled to the locking element, the axis extending from the locking element to an end of the pin remote from the end to which the locking element is coupled along the direction of pin extension, the locking element being rotatable about the axis, the axis being rotatable in a plane transverse to the direction of extension of the elongate body.

5. A system according to any of the preceding claims 1-4, wherein the polyhedron of the comer piece is a cube, where an edge of the cube is at least as long as a side of an outer dimension of the cross-section of each frame member.23 Attorney Docket No.: 15516-137WOU16. A system according to any of the preceding claims 1-5, wherein the polygonal crosssection of the first end and of the second end of the insert of the recesses in the comer piece and of the hollow ends of each frame member have four comers.

7. A system according to any of the preceding claims 1-6, wherein several comer pieces are positioned adjacent to each other, whereby several frame members can be connected in parallel with one or more additional frame members at an angle.

8. A system according to any of the preceding claims 1-7. wherein the second end of the insert has a smaller cross-section than the first end of the insert.

9. A system according to any of the preceding claims 1-8, wherein the insert is fully receivable in a hollow end of each frame member in combination with the recess of the comer piece.

10. A system according to any of the preceding claims 1-9, wherein the two plates of the reinforcement element are connected to each other in an L-shape to form a right angle.

11. A system according to any of the preceding claims 1-10, wherein the two plates of the reinforcement element with free edges, opposite the right angle, are connected by a plate with an opening.

12. A system according to any of the preceding claims 1-11, wherein the two plates of the reinforcement element are rectangular plates connecting two triangular plates, the triangular plates comprising a right angle, the two rectangular plates being connected to each other on the adjacent sides of the right angle of the two triangular plates.

13. A system according to any of the preceding claims 1-12, further including one or more fasteners, the comer piece and the inserts being fixable to each other by the fasteners; wherein each of the fasteners, when fixing the comer piece and the insert, extends at least partially into the comer piece from the first end of the insert, through the insert, and from the second end of the insert.

14. The system according to claim 13, wherein the fasteners are pins.24 Attorney Docket No.: 15516-137WOU1

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