NZ571365A

NZ571365A - Frame construction cabinet using threaded corner connectors in the form of a block and clamping element

Info

Publication number: NZ571365A
Application number: NZ571365A
Authority: NZ
Inventors: Georg Fischer; Martin Endres
Original assignee: Elgan Invest Inc
Priority date: 2006-03-13
Filing date: 2007-02-20
Publication date: 2011-09-30
Also published as: CA2645605A1; RU2008140309A; CA2645605C; RU2400888C2; EP1994614A1; ZA200808392B; WO2007104406A1; EP1994614B1

Abstract

A frame construction (1) for a switchgear cabinet is disclosed. The frame is constructed from frame profiles (8) connected to one another via connecting elements (7, 19). At least one of the frame profiles (8) is in the form of an L-profile (8) in cross section. A clamping element (19) in the form of an L-shaped plate is fixed inside the L-profile and working together with a mounting block (7), the L-profiles are connected together with fasteners.

Description

Received at IPONZ 9 August 2011 1 Frame construction for a switchgear cabinet, switchgear cabinet and construction kit for the switchgear cabinet The invention relates to a frame construction for a switchgear cabinet with frame profiles and connecting elements, wherein the frame profiles are connected and/or connectable via the connecting elements in order to form a frame construction together, wherein at least one of the frame profiles is formed in the cross-sectional view, as an L-profile with one first and one second leg section, said second leg section arranged in an L-shape thereto, and the leg sections delimit an inner sector together, wherein the first leg section passes into a front-side section which is angled towards the inner sector and the first front-side section passes into a first end-section which is angled towards the first leg section and wherein the second leg section passes into a second front-side section which is angled towards the inner sector, and the second front-side section passes into the second end-section, which is angled towards the second leg section, wherein at the first front-side section and in longitudinal direction of the L-profile, first through openings are arranged in a fixed spacing, as well as a switchgear cabinet and a construction kit for such switchgear cabinet.

Switchgear cabinets, especially low-voltage switchgear cabinets are used in numerous plants, for example as electricity supply for large facilities or for production machines. The switchgear cabinets are typically set up specifically for the respective purpose of use. However to simplify the planning and design of switchgear cabinets and to keep a particular modularity so they can be expanded later on or to enable the modernisation of the switchgear cabinets, switchgear cabinets usually consist of a frame construction with mechanical interfaces, where the respective, necessary electric functional modules are attached to. Typically the frame constructions are enclosed by cover elements or mounted doors.

Such a frame construction is offered by the company Logstrup in Kvistgard, Denmark. Components of this frame construction are, in the cross-sectional view, L-shaped profiles having a plurality of angles, which profiles are screwed together Received at IPONZ 9 August 2011 2 with corner mounting pieces. The L-shaped profiles comprise numerous mounting openings, which are sometimes formed as mounting holes and sometimes mounting slots. Typically the electric functional modules are fixed to this frame construction via adapter elements.

It is therefore the object of the invention to suggest a simplified frame construction which allows a simplified project planning and assembly of switchgear cabinets, or to at least provide the public with a useful alternative. This object is solved by a frame construction of the invention as well as a switchgear cabinet or a construction kit for a switchgear cabinet having the features of the invention.

In one aspect, the invention provides a frame construction for a switchgear cabinet, comprising frame profiles and connecting elements, wherein the frame profiles are connected and/or connectable via the connecting elements in order to form the frame construction together, wherein at least one of the frame profiles, in the cross-sectional view, is formed as an L-profile with a first and a second leg section arranged in an L-shape thereto and the leg sections together forming an inner sector, wherein the first leg section passes into a first front-side section which is angled towards the inner sector, and the first front-side section passes into a first end-section which is angled towards the first leg section, and wherein the second leg section passes into a second front-side section which is angled towards the inner sector and the second front-side section passes into a second end-section which is angled towards the second leg section, wherein at the first front-side section and in a longitudinal direction of the L-profile, first through openings are arranged in a fixed spacing, wherein at the first end section and in a longitudinal direction of the L-profile second through openings are arranged having the fixed spacing, wherein at least one of the connecting elements is formed as a mounting block to connect two and/or three of the profiles, comprising a clamping element being fixable to the L-profile in a form fit, and working together with the mounting block so the L-profile is connected with the mounting block in frictional connection or in form fit, wherein the clamping element is formed as a mounting element or is supported by a mounting element, which mounting element engages the through Received at IPONZ 9 August 2011 3 openings of the L-profile, wherein the L-profile, after cutting of an L-profile semi-finished part to length, is ready to mount and provides mechanical interfaces, and wherein the L-profile is connected or connectible to the mounting block.

The frame construction according to the invention is suitable and/or formed for a switchgear cabinet, especially for a low-voltage and/or medium-voltage switchgear cabinet. It is preferred to operate currents up to 3.000 A, especially up to 5.000 A or up to 10.000 A, and/or voltages up to 1 kV, especially up to 20kV or 30 kV in the switchgear cabinet. In particular voltages over 250 V and/or currents over 150 A are operated. Preferably the switchgear cabinets, which are built in the frame construction, comply with the test requirements according to IEC 60439-1, EN 60439-1 or DIN EN 60439 Part 1 in the respective valid version and/or the corresponding subsequent conditions.

The frame construction comprises frame profiles, which are connected and/or connectable by connecting elements in order to form the frame construction. Particularly, the frame profiles are cut-off to the length necessary for the frame construction and/or are ready to mount. The length of the frame profiles is preferably an integral multiple of the fixed/non-variable spacing. Preferably the connection between the frame profile and the connecting elements is formed as form-closed/positive and/or frictional fit connection, especially as screw coupling, wherein the connecting elements and the frame profiles can preferably be separated without being destroyed.

At least one of the frame profiles is formed as an L-profile with first and second leg sections, arranged to each other in an L-shape, wherein the cross-section is preferably defined as a plane perpendicular to the longitudinal direction of the L-profile and wherein between the leg sections an inner sector/area is defined. Viewed further in the cross-sectional view, the first leg section goes into an angled first front-side section, wherein the first front-side section is angled towards the inner section and/or towards the second leg section, especially sloping. Thus the front-side section is especially angled in and/or towards the area enclosed by both leg sections. The first front-side section passes into a first angled end-section, wherein the first end section is angled towards the first leg section and/or into the direction of the leg section and especially sloping. The first leg section, the first Received at IPONZ 9 August 2011 4 front-side section and the first end section together form a common, especially U-formed shape. At the second leg section, analogue to this, a second front side section as well as a second end section attach.

At the first front-side section and in longitudinal direction of the L-profile first through openings are provided, that are arranged in a fixed spacing, thus having a fixed constant distance and are sequenced especially in a straight line.

According to the invention second through openings are arranged at the first end section and in longitudinal direction of the L-profile in the same fixed spacing, thus especially sequenced along a straight line. Preferably the first and second through holes are arranged at the same height along the longitudinal direction of the L-profile.

It is an underlying idea of the invention, that with help of this modification, mechanical interfaces are provided in a frame construction, which allow the integration of electric functional modules, especially fused load connecting blocks, without any and/or with few adapters, from the most important manufacturers. At the same time, the L-profiles according to the invention offer great mechanical stability.

In a preferred embodiment of the invention at the second front-side section and/or at the second end-section, third and where required fourth through openings are arranged in longitudinal direction of the L-profile in the fixed spacing. With this embodiment, the L-profile offers a further mechanical interface.

Optionally, the L-profile comprises fifth through openings, which are located in the first and second leg sections, respectively, wherein the fifth through holes are arranged opposite and/or in alignment to the second and fourth through holes, respectively. Further optional sixth through openings are provided, which are located in the first and second leg sections, respectively, wherein the sixth through holes are arranged opposite and/or in alignment to the third and first through holes, respectively.

The fifth through holes allow for example the mounting of covers/blinds or door elements and can also be used as guiding and/or fixture of pin elements with or Received at IPONZ 9 August 2011 without screw-in threads, which engage and are screwed in, respectively, with one pin end into one of the fifth or sixth through openings and with the other pin end in an opposite through opening. These pin elements are for example used for fixing the connecting elements. Instead of pin elements it is also possible to use other fastening elements, which can engage into opposite and/or aligned through openings.

In a preferred embodiment of the invention, the first and section leg sections are connected/joined to each other and in the cross-sectional view arranged at right angles to each other. In is particularly advantageous, if in addition, the leg sections are arranged parallel to the associated end-sections, respectively, and/or the front-side sections are arranged perpendicular to the associated leg sections and/or end-sections, respectively. Preferably the L-profile, in the cross-sectional view, comprises an axial-symmetrical design, wherein the axis/plane of symmetry is formed as bisecting line between both leg sections. It is further preferred that the first, second, third, fourth, fifth and/or sixth through openings are distributed axial-symmetrically as well.

In an ideal production design the L-profile is formed in one piece and preferably made from a galvanised and/or aluminium or zinc coated steel plate or stainless steel plates, preferably with a thickness or approximately 2 mm.

It is advantageous, if the length of the leg section, front-side section and/or end-section or -sections are an integral multiple of the fixed grid spacing. With this embodiment the external dimensions of the L-profile are also compatible to the fixed grid spacing which is already used with the spacing of the through holes in longitudinal direction.

With an optional development of the invention, a respective one of the first, second, third, fourth, fifth and/or sixth through openings of the L-shaped profile is arranged in one plane, especially of a cutting/sectional plane, perpendicular to the longitudinal direction of the L- profile in a grid with a fixed spacing. This further development underlines the inventive idea to create with the frame construction a three dimensional grid of through openings as a mechanical interface. With this development, the through holes are not only spaced apart in the longitudinal axis of the L-profile with the fixed grid spacing, but are also arranged perpendicular to Received at IPONZ 9 August 2011 6 the longitudinal direction of the L-profile in a corresponding grid. Preferably the distance of the through holes to each other relates to the middle of the openings of the respective through holes on the top and/or outer side of the L-profile. Preferably at least 50%, preferably more than 70%, especially more than 90% of all through openings are arranged in the profiles in the grid.

In an advantageous realisation of the frame construction, the fixed spacing is 12.5 mm. The spacing thus covers the spacing of 25mm typical for switchgear units and also take into consideration the fact that electrical functional modules can be mounted shifted by half of the fixed spacing. This realisation bases on the consideration that there are different manufacturer norms regarding grid spacings, which are not compatible with the use of a typical grid spacing of 25mm, but rather lead to gaps between the electrical functional modules from different manufacturers. Further preferred are through openings as circular openings, especially formed with a diameter of approx. 5mm, especially 5.2mm.

It is preferred to use a mounting block as a connecting element between two L-shaped profiles, which preferably comprises at two side faces L-shaped parts/raised contours, which during assembly will be at least partly encompassed in a form fit. A more practical design is there, when on three side faces an L-shaped part/raised contour is provided, as the mounting block is usable as a corner element. In a further development of the mounting block, the L-shaped contours are interrupted, to provide a possibility for receiving other profiles, especially C-profiles, especially in a form fit.

For assembly it is practical if the mounting block has on at least two side faces, especially three side faces, especially in the middle or near the middle a respective thread for receiving a fixing screw. The depth direction of the screw thread is preferably perpendicular to the respective side face and/or aligned so that the fixing screw is parallel to the longitudinal direction of the L-profile to be fixed. Especially advantageous is if the dimensions of the mounting block are also matched to the fixed grid spacing and/or the external measurements of the mounting block are formed without parts/raised contours as an integral multiple of the grid spacing.

In addition to this the frame construction can include a clamping element, which Received at IPONZ 9 August 2011 7 can be fixed to the L-profile and which works together with the mounting block to fix the mounting block and the L-profile. Especially the clamping element is formed as the pin element or mounting element mentioned above or supports thereon.

The frame construction according to the invention can optionally include further frame profiles, such as a C-profile, a U-profile and/or an L-profile. However these profiles have one thing in common, that they comprise through holes, which are spaced apart in longitudinal direction of the profiles in the fixed spacing and/or are arranged in a plane perpendicular to the longitudinal direction of the profiles in a grid with the fixed spacing.

With the design of the frame construction, the L-profiles are preferably used as corner pillars and/or as frame profiles of the ceiling frame and/or floor frame. The underlying problem of the invention is also solved with a switchgear cabinet or a construction kit for a switchgear cabinet comprising a frame construction according to any of the claims 1 to 15. The construction kit includes - as already described - L-profiles and connecting elements, especially mounting blocks, as well as, optionally, C-profiles, U-profiles and/or L-profiles as described above.

Both with the frame construction and with the switchgear cabinet, most of the mentioned embodiments provide the additional advantage that their external dimensions (WxDxH) can be chosen in the fixed spacing. In this way with the preferred embodiments not only the center of the holes of the through openings but also for example the external corners of the switchgear cabinet are arranged in the grid with the fixed spacing. Besides the spacing requirement the free choice of the external dimensions is attained by the fact that the profiles after cutting to length are already ready to mount. Especially there is no further necessity to provide additional mechanical interfaces i.e. by re-shaping, for connecting to the mounting blocks.

The term "comprising" as used in this specification and claims means "consisting at least in part of". When interpreting each statement and claim in the specification that includes the term "comprising", features other than that or those prefaced by the term may also be present. Related terms such as "comprise" and "comprises" are to be interpreted in the same manner.

Received at IPONZ 9 August 2011 8 Further features, details, advantages, combinations and effects based on this invention can be found in the following embodiments.

Figure 1 shows a first embodiment of a frame construction according to the invention; Figure 2a,b,c, shows detailed views of the frame construction in figure 1; Figure 3 shows an L-profile in figure 1 in planview and sectional view; Figure 4 shows a corner portion of the frame construction in figure 1; Figure 5 shows a mounting block from the corner portion in figure 4; Figure 6 shows a clamping place from the corner portion in figure 4; Figure 7 shows a C-profile in figure 1 in planview and sectional view; Figure 8 shows a U-profile in figure 1 in planview and sectional view; Figure 9 shows a second embodiment of a frame construction according to the invention; Figure 10 shows the frame construction in figure 9 in planview with mounted fused load connecting block of a first embodiment; Figure 11 shows the frame construction in figure 9 in planview with mounted fused load connecting block in a second embodiment; Figure 12 shows an alternative mounting block i.e. for the corner portions in figure 4; Figure 13 shows the alternative mounting block of the figure in the mounted state.

Like same reference numerals in the figures denote the same or corresponding Received at IPONZ 9 August 2011 9 elements.

Figure 1 shows a first embodiment for a frame construction 1 of a switchgear cabinet with the dimensions (WxDxH) of 600mm x 600mm x 2000mm in schematic threedimensional view tilted from above.

The rectangular frame construction 1 comprises a floor frame 2 and a ceiling frame 3, which are connected together via four corner pillars 4 and an intermediate pillar 5.

The floor frame 2 and the ceiling frame 3, respectively, are formed by four connecting profiles 6, which are connected via mounting blocks 7 in such a way that the four connecting profiles 6 of the floor frame 2 and the ceiling frame 3, respectively, make up a rectangle. In the corners of the rectangle, the mounting blocks 7 are arranged, wherein the mounting blocks 7 of the floor frame 2 are connected via the corner pillars 4 with the mounting blocks 7 of the ceiling frame 3.

Both the connecting profiles 6 of the floor frame 2 and the ceiling frame 3 as well as the corner pillars 4 are formed as L-profiles identical in construction. In this way the connecting profiles 6 and the corner pillars 4 can be cut off from the same semi-finished L-profile.

Figure 3 shows such a L-profile 8 as it will be used as a connecting profile 6 and/or corner pillar 4 in the frame construction in Figure 1, on the left side in schematic planview, and on the right side in a schematic sectional view, in a sectional plane, perpendicular to the longitudinal direction of the L-profile 8, like for example along the cutting plane Ill-Ill. The L-profile 8 is formed as a one-piece, bent steel profile. As can best be seen in the sectional view, the L-profile 8 comprises a first and second leg section 9 and 10, respectively, which are arranged perpendicular to each other in an L-form and together enclose or delimit an inner sector A.

Attaching to the first leg section 9, is a first front-side section 11, which starting from the longitudinal direction of the first leg section 9 in direction of the second leg section 10 is bent at right-angles and runs parallel, especially partly congruent Received at IPONZ 9 August 2011 with it. Attaching to the front side section 11 is a first end section 12, which starting from the longitudinal direction of the first front side section 11 is bent towards the first leg section 9 at right angles and runs parallel, especially partly congruent with it. Together the first leg section 9, the first front side section 11 and the first end section 12 form a U-shape.

In the same way, attaching to the second leg section 10 is a second front side section 13 and a second end-section 14 so that the L-profile 8, in the sectional view, is formed axialsymmetrical to an axis of symmetry, which, in the sectional plane, runs as bisecting line between the first and second leg sections 9 and 10.

The lengths of the different sections 9 to 14 of the L-profile 8 are formed, so that the corner points (or corner areas) a,b,c,d,e between the sections 9 to 14 are arranged in an equal grid with a fixed spacing of 12.5mm. In particular all sections 9, 10, 11, and 13, which are formed as intermediate sections, have lengths which are an integral multiple of the fixed spacing. The front-side sections 11 and 13 are formed having half the length of the leg sections 9 and 10.

In the end sections 12 and 14 and in the front-side sections 11 and 13 respective circular through holes 15 a, b and 16 a, b, respectively, are formed with a diameter of 5.1mm. Optionally, opposite to and/or in true alignment to the through holes 15a, b in the end sections 12 and 14, further through holes 17a, b are placed in the first or second leg sections 9 and 10, respectively. It is further optional that through holes 18b are formed in the second leg section 10 opposite to the through holes 16a in the front-side section 11 as well as through holes 18a are formed into the first leg section 9 opposite to and/or in true alignment to the through holes 16b in the second front-side section 13.

As can be seen best from the sectional view, a respective through hole 15 a, b to 18 a, b lies in a common sectional plane. The through holes 15 a, b to 18 a,b, especially the centre of those holes on the exterior side of the profile 8, on one cutting plane, are arranged in a grid with fixed spacing of 12.5mm and particularly in the same grid as the corner points a, b, c, d, e. As can be seen from the planview on the left side of figure 3, planes having a respective group of through holes 15 a,b to 18 a, b are arranged equidistantly with a spacing of 12.5mm in longitudinal direction of the L-profile 8. In this way there is not only a two Received at IPONZ 9 August 2011 11 dimensional grid in the sectional plane, but also the through openings and/or the corner points are arranged in a three-dimensional grid with the grid spacing of 12.5 mm. As a preferred alternative design an L-profile 8 can be seen, which comprises a through hole 15a, b to 17a,b in every plane and only in the first and last plane possesses a through hole 18a, b.

Figure 4 shows the corner connection of 3 L-profiles 8 with one mounting block 7 as it is used for example in frame construction 1. The three L-profiles 8 are arranged at right angles to each other, the corner area of the corner connection will be constructed using the mounting block 7 and in such a way that the exterior sides of the first and second leg sections of the L-profiles 8, respectively, form a common plane with the respective exterior side of the mounting block 7.

For a better understanding of the construction of the corner connection, it is referenced to figures 5 and 6, which show the mounting block 7 and a clamping plate 19, respectively. The mounting block 7 is a cube with an edge length, which is an integral multiple of the spacing and in this example is 50 mm. On three contact sides 20a,b,c of the cube, L-shaped parts/raised contours 21a,b,c are provided, which are matched in their dimensions to the L-shaped profile 8, so that the parts/raised contours 21a,b,c can be used as assembly help and form closure. Just off centre of each contact side 20a,b,c is a thread bore 22a,b,c to receive fixing screws. The direction of depth of the thread bores is aligned perpendicular to the respective contact sides 20a,b,c and/or to the opposite exterior sides. The three exterior sides of the mounting block 7, that are facing away and therefore not visible, are formed substantially flat.

The clamping plate 19 in figure 6 is formed as L-shaped plate with a through opening. During the assembly, as is shown in figure 4, a clamping plate 19 will be inserted into each L-profile 8 and secured with securing means, such as a pin (not shown) or the like against a movement towards the mounting block 7 in a form closure. Instead of a pin, it is also possible to insert a screw e.g. with a thread length of 25mm. The assembly screws will be slid through the through opening of the clamping plate 19 and screwed into the thread bores 22a,b,c, wherein the clamping plates 19 and thus the respective L-profiles 8 are pulled against the mounting block 7 and finally fixed.

Received at IPONZ 9 August 2011 12 In figure 1 it can be seen, that the whole external skeleton of the frame construction 1, especially each edge section, is made up from the described L-shaped profiles 8. The intermediate strut 5 however is realized as a C-profile 23 as shown in figure 7.

In figure 7, the C-profile 23 is shown in the same view as the L-profile 8 in figure 3. The sectional view along the sectional line VII-VII discloses that the C-profile 23 comprises a base section 24, to which on both sides a respective front-side section 25 a and b, respectively, and in the further progression, an end-section 26 a and b, respectively, attach, wherein these sections analogue to the sections 11 to 14 of the L-profile 8 are arranged and/or formed at right angles to each other. The C-profile 23 especially comprises through openings as well, which are arranged in a grid with a spacing of 12.5mm, and/or corner points or areas, which are arranged in the same grid spacing. The through openings are arranged analogue to the L-profile along the longitudinal direction of the C-profile in planes, which are spaced apart from each other in the spacing of 12.5 mm. The C-profile 23 thus supplements a construction kit consisting of L-profiles 8 and connecting elements, especially mounting blocks 7, with an optional component, which makes the 3-D grid extendable.

In figure 1, an intermediate strut/support 27 is shown on the front side of the frame construction, which consists of an U-profile 28 which is shown in figure 8. The U-profile 28 comprises a base section 29 to which at both ends end sections 30 a and b, respectively, attach at right-angles. Analogue to the L-profile 8 and the C-profile 23, the U-profile 28 also comprises through holes and/or corner points or areas, which are arranged in a grid with the spacing 12.5mm. Also the planes, in which the through openings are organized, are spaced apart from each other in the spacing. Thus the U-profile 28 forms a further optional component in the construction kit described above.

The figures 2 a, b, c show enlarged detailed views A, B and C from below and illustrate the connection of different profiles with the help of connecting plates and corners as further connecting elements. Preferably the through openings in these connecting elements are also formed in the grid with fixed spacing of 12.5 mm.

Figure 9 shows a second embodiment of a frame construction 1 with the Received at IPONZ 9 August 2011 13 dimensions (WxDxH) of 1000mm x 600 mm x 2000mm, using the same components of the construction kit 1 in figure 1, especially in different lengths and thus illustrating the numerous possibilities of use of these components. As an example, two safety/fused connecting blocks 31 and 32 are mounted in the frame construction 1. From the figure it is visible, that by the different components of the construction kit, a frame construction 1 is made, which provides a continuous grid spanning over several components, with a fixed spacing of through holes, as mechanical interfaces. Through this three dimensional grid of through holes it is possible to mount the safety/fused connecting blocks 31 and 32 without any additional and/or frame construction specific adapter elements.

Figures 10 and 11 show a respective frame construction, which is similar or identical to the frame construction 1 in figure 9 in a planview. Figure 10 illustrates the installation of a safety/fused connecting block 33 from the ABB slimline series, which is fixed to the corner pillar 5 (from the L-profile 8), the intermediate pillar 4 (from the C-profile 23) as well as to the intermediate struts/supports 27 (from the U-profile) with a respective screw connection and no adapter.

Figure 11 shows the same frame construction as in figure 10, wherein a safety/fused connecting block 34 from the company "Jean Muller" is mounted. The safety/fused connecting block 34 is also mounted without any additional adapter material.

The dimensions, especially the given lengths and spacing of the embodiment relate to especially advantageous embodiments, but the possibility to use other dimensions is also part of this disclosure.

Figure 12 shows a different mounting block 7 with an edge length of 50mm in two different three-dimensional schematic views. In contrast to the mounting block 7 in figure 5, the mounting block 7 in figure 12 is formed by an Aluminium die casting method. The functional elements such as the contact sides 20a,b,c, the L-shaped parts/raised contours 21a,b,c as well as the threaded holes 22a,b,c are also existent in the mounting block 7 in figure 12, but in a form, which has been adapted to the manufacturing procedure for example by using oblique edges. In contrast to the mounting block 7 in figure 5, the mounting block 7 in figure 12 has L-shaped forms 21a,b,c, which have been interrupted twice. The interruptions in Received at IPONZ 9 August 2011 14 the shown embodiment are realized such that the L-shaped forms 21 a, b, c are made up of three especially right-angled partial areas which protrude from the side areas of the contact sides 20 a, b, c. With other mounting blocks constructed differently, the double interruptions can be realized differently.

As can been seen best from figure 13, the double interruption allows the mounting block 7 to receive C-profiles 23, wherein the C-profiles 23 encompass two of the three rectangular partial areas in a form closure. The mounting block 7 is thus formed as connecting element between the L-profiles and C-profiles 23.

Received at IPONZ 9 August 2011

Claims

Claims:

1. A frame construction for a switchgear cabinet, comprising frame profiles and connecting elements, wherein the frame profiles are connected and/or connectable via the connecting elements in order to form the frame construction together, wherein at least one of the frame profiles, in the cross-sectional view, is formed as an L-profile with a first and a second leg section arranged in an L-shape thereto and the leg sections together forming an inner sector, wherein the first leg section passes into a first front-side section which is angled towards the inner sector, and the first front-side section passes into a first end-section which is angled towards the first leg section, and wherein the second leg section passes into a second front-side section which is angled towards the inner sector and the second front-side section passes into a second end-section which is angled towards the second leg section, wherein at the first front-side section and in a longitudinal direction of the L-profile, first through openings are arranged in a fixed spacing, wherein at the first end section and in a longitudinal direction of the L-profile second through openings are arranged having the fixed spacing, wherein at least one of the connecting elements is formed as a mounting block to connect two and/or three of the profiles, comprising a clamping element being fixable to the L-profile in a form fit, and working together with the mounting block so the L-profile is connected with the mounting block in frictional connection or in form fit, wherein the clamping element is formed as a mounting element or is supported by a mounting element, which mounting element engages the through openings of the L-profile, wherein the L-profile, after cutting of an L-profile semi-finished part to length, is ready to mount and provides mechanical interfaces, and wherein the L-profile is connected or connectible to the mounting block.

2. Frame construction according to claim 1, wherein, after cutting to length, no further mechanical interfaces are provided in the L-profile for connecting with the mounting block. Received at IPONZ 9 August 2011 16

3. Frame construction according to claim 1 or 2, wherein the L-profiles are formed as corner pillars and as frame profiles and connecting profiles of a ceiling-and/or floor-frame, respectively, wherein the connecting profiles and the corner pillars are cut from the same L-profile semi-finished part.

4. Frame construction according to claim 3, wherein the corner pillars and the frame profiles comprise different lengths.

5. Frame construction according to any one of the preceding claims, wherein the mounting block comprises a centered or nearly centered thread for accepting a fixing screw, for fixing to at least two side faces.

6. Frame construction according to any one of the preceding claims, wherein the mounting block comprises at least two side faces, L-shaped parts/raised contours, which when mounted are, at least in parts, encompassed by the L-profiles in a form fit.

7. Frame construction according to claim 6, wherein the L-shaped parts/raised contours are interrupted, to provide a possibility for receiving other profiles in a form fit.

8. Frame construction according to claim 7, wherein the L-shaped parts/raised contours are interrupted for receiving C-profiles in a form fit.

9. Frame construction according to one of the preceding claims, wherein the clamping element is formed as an L-shaped clamping plate with a through opening.

10. Frame construction according to claim 9, wherein during mounting, one of the clamping plates is inserted in every L-profile and secured in a form fit relationship by securing means to prevent movement of the clamping plates towards the mounting block.

11. Frame construction according to any one of the preceding claims, wherein at the second front-side section and/or at the second end-section, third and/or Received at IPONZ 9 August 2011 17 fourth through openings are arranged in the longitudinal direction of the L-profile in the fixed spacing.

12. Frame construction according to any one of the preceding claims, wherein fifth through openings are arranged in the first and second leg sections, respectively, wherein the fifth through openings are arranged opposite to the second and the fourth through openings, respectively.

13. Frame construction according to any one of the preceding claims, wherein sixth through openings are arranged in the first and second leg sections, respectively, wherein the sixth through openings are arranged opposite to the third and the first through openings, respectively.

14. Frame construction according to any one of the preceding claims, wherein the first and second leg sections are connected to each other and/or are arranged at right angles to each other.

15. Frame construction according to any one of the preceding claims, wherein the leg sections are arranged in parallel to the associated end-sections, respectively, and/or the front-side sections are arranged perpendicular to the associated leg sections and/or end-sections, respectively.

16. Frame construction according to any one of the preceding claims, wherein the L-profile is formed in one piece.

17. Frame construction according to any one of the preceding claims, wherein the length of the leg section, front-side section and/or end-section and/or -sections is an integral multiple of the fixed spacing.

18. Frame construction according to any one of the preceding claims, wherein a respective one of the first, second, third, fourth, fifth and/or sixth through openings are arranged in a plane perpendicular to the longitudinal direction of the L-profile in a grid having the fixed spacing.

19. Frame construction according to any one of the preceding claims, wherein the fixed spacing is 12.5mm. Received at IPONZ 9 August 2011 18

20. Frame construction according to any one of the preceding claims wherein the mounting block comprises at least two side faces, L-shaped parts/raised contours, which when mounting are at least in part encompassed by the L-profiles in a form fit.

21. Frame construction according to any one of the preceding claims, wherein the mounting block comprises at least on two side faces especially centered threaded bores, wherein the depth direction of the threaded bores is perpendicular or substantially perpendicular to the respective side faces.

22. Frame construction according to any one of the preceding claims, wherein the dimensions of the mounting block are an integral multiple of the fixed spacing.

23. Frame construction according to claim 3, wherein one or more and/or all corner pillars and/or one or more and/or all profiles is or are formed as an L-profile in order to form a ceiling- and/or floor-frame.

24. Switchgear cabinet or construction kit for a switchgear cabinet with a frame construction according to any one of the preceding claims.

25. A frame construction for a switchgear cabinet substantially as herein described with reference to any embodiment shown in any one or more of the accompanying drawings.