EP1380081A1

EP1380081A1 - Sectional steel frame from profiled sections that are screwed together

Info

Publication number: EP1380081A1
Application number: EP02764043A
Authority: EP
Inventors: Rolf-Guenter Genzel; Daniel Joachim; Bernd Lienau
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2001-04-20
Filing date: 2002-04-04
Publication date: 2004-01-14
Also published as: WO2002087035A1; CN1295829C; KR20030090759A; UA74637C2; DE10120738C1; CN1500301A; KR100576951B1

Abstract

The invention relates to a screwed sectional steel frame (1) wherein the ends (31, 32) of frame sections (16, 17) for lateral frames (2) are unsymmetrical and have miter edges (25, 26). On one end (31), an inwardly cranked fastening lug (18) projecting from the miter edge (25) is provided with openings (19) for fastening screws (39). The first end (31) is further provided with an insertion tongue (27) and the other end (32) is provided with a slot (28) for an insertion tongue (27) of a subsequent frame section (17). In order to link two frame sections (2), crossbars (3) are provided. These crossbars have on both ends inwardly cranked fastening lugs (21, 22) that are destined to rest on the frame sections (16, 17). The fastening lugs have openings (19, 23) with passages (20, 24) for self-threaded fastening screws (39) that extend through sunk-in through-openings (40) of the frame sections (16, 17).

Description

description

Profile steel frame made of screwed profile pieces

The invention relates to a steel profile frame made of profile pieces connected to one another by fastening screws with a profile shape having at least three legs bent in the same direction, the profile pieces being arranged with their ends overlapping one another to form scaffold corners.

In the case of such a scaffold, as has become known from US Pat. No. 4,114,336, high strength of the construction, in particular high corner stiffness, is particularly important, since such scaffolds are relatively high and can be equipped with heavy internals , In addition, it may be necessary, for example in the case of switch stands, to transport such stands with the built-in heavy switch devices. Special attention should therefore be paid to the corner connections of such scaffolding.

A large number of conventional constructions for the production of profile steel scaffolds of this type are known, as are required in particular for the construction of individual (free-standing) control cabinets or multi-field scaffolds for switchgear assemblies.

One of the numerous known designs for scaffolding of the type mentioned is based on the use of different suitable profile shapes, wherein side frames are first produced from profile pieces of one profile shape and two such side frames are then made using cross bars with another Profile shape to be connected to the finished scaffold. In this way it can be achieved that, for example, a larger area is available on the side for placing side walls, while the design of the cross bars ensures a high degree of stability of the scaffold or frame.

For the desired strength or stability of the scaffold, the connection of the profile pieces in the scaffold corners is essential. Both detachable and non-detachable connections are known for this. A large number of detachable connections of profile pieces are also known. For this purpose, the mentioned US 4 114 336 shows a possibility of connecting the profile pieces directly to one another.

In contrast, DE 299 23 458 U1 proposes to improve the connection of the profile pieces that collide in a scaffold corner by a simple corner piece made of sheet steel, which is connected to each of the profile pieces by two clamping elements (screws, rivets). In order to make the connection as rigid as possible or stable in deformation, funnel-shaped indentations are incorporated into both the corner piece and the profile pieces, in which the screw holes lie centrally. This not only achieves a mutual alignment of the parts when the clamping elements are tightened, but also achieves an effective form fit that results in a largely rigid corner connection.

Obviously, a direct connection of profile parts to a scaffold corner has the advantage of eliminating special ones

Corner pieces, but cannot meet the described requirements in context. The invention has for its object a screwed

To create profile steel framework, which has a high deformation rigidity and has flush transitions between the profile pieces on the entire circumference in order to obtain a smooth outer surface.

This object is achieved according to the invention the following features:

- The profile pieces are designed as frame parts with a first profile shape and as cross bars with a second profile shape, a side frame is composed of the frame parts, which has outer legs lying in a frame plane, - Two side frames are connected to one another by the cross bars, the outer legs are on the The ends of the frame parts are provided with a mitred edge, at a first end of each frame part there is an inwardly bent fastening tab which projects from the mitred edge and has openings for fastening screws, each frame part is at the first end with at least one protruding tongue and at the second end with a slot for receiving one Insert tongue of a further frame part to be connected to the frame part and at both ends with slots for tongues of the cross bars, the cross bars have inwardly cranked fastening tabs provided with openings for fastening screws r Connection to the frame parts.

The combination of mitred edges and fastening see a surprising strength is achieved for screwed frameworks. The advantages of previously known scaffolding are retained. This includes the use of already known and established profile shapes. In the context of the invention, however, these are provided with differently shaped ends, which are asymmetrical in the case of the frame parts. According to a preferred embodiment of the invention, the following features can be provided for this:

the frame parts of the side frames have an inner end leg located on the inner edge of the side frame and adjoining the outer leg,

- On the outer edge of the side frame there is an inner end leg facing the interior of the sectional steel frame, - The outer leg and the outer end leg are connected by an intermediate leg, the tongue and the slot for a subsequent frame part are arranged on the inner end leg, the slots for engagement of crossbars are located in the outer end leg,

- The openings for fastening screws of the fastening straps of the cross bars are located on the intermediate leg.

There are various suitable arrangements for the access of the fastening tabs at the ends of the cross bars to the frame parts. It proves to be particularly expedient if the outer end legs are shortened at the ends of the frame parts in accordance with the width of the fastening tabs of the cross bars. In this way, simply designed, that is to say parallel offset fastening tabs can be used. A further embodiment of the invention can both simplify the manufacture of the side frames and significantly increase the rigidity of the frame corners. This can be done in that the miter edges end in front of the longitudinal edges of the outer leg of the frame parts and in that at the transitions from the miter edges to the inner end leg and to the intermediate leg, there are perpendicular steps, which are formed at the first end as recesses and the second end as projections , such that support surfaces for the mutual abutment of two frame parts to be connected are formed. Since the support surfaces are as far apart as possible due to their position near the longitudinal edges of the frame parts, they effectively support the fastening screws in ensuring the stability of the frame corners.

In order to achieve screw connections that are as stable as possible even with the usual thickness of the steel sheet that is used to manufacture the frame parts and cross bars, it is recommended that the openings for fastening screws in the cranked fastening tabs of both the frame parts of the side frames and the cross bars are provided with passages , Furthermore, the through openings provided in the support surface for the fastening tabs can advantageously be designed as countersunk openings.

As already mentioned, profile shapes that have already been introduced and can be seen with specially designed ends can be used for the purposes of the invention. In the context of the invention, the cross bars can be two perpendicular to one another

Have main legs and end legs adjoining them, with each main leg having a protruding inwardly bent fastening tab at both ends and the end Legs are provided with a tongue at each end.

The profile steel frame designed according to the invention is particularly suitable for use as a frame for a control cabinet or as a frame for a multi-panel switchgear, since this is where the special properties come into play.

For a better understanding, the present invention will be explained in more detail below with the aid of a preferred exemplary embodiment, which does not restrict the scope of protection.

Fig. 1 shows the basic structure of the sectional steel frame according to the invention in a perspective view.

FIG. 2 shows in detail the scaffold corner located at the bottom left in the rear part of the section steel frame in FIG. 1.

3 shows as a further detail the scaffolding corner located at the bottom and front right in FIG. 1.

FIG. 4 shows a development of a frame part of a side frame of the frame in FIG. 1.

FIG. 5 shows a top view of the frame part produced from the development according to FIG. 4.

FIG. 6 shows a front view of the frame part produced from the development according to FIG. 4.

FIG. 7 shows a side view of the frame part produced from the development according to FIG. 4. 8 shows a development of a cross member of the scaffold according to FIG. 1.

FIG. 9 shows a top view of the cross member produced from the development according to FIG. 8.

FIG. 10 shows a front view of the cross member produced from the development according to FIG. 8.

FIG. 11 shows a side view of the cross member produced from the development according to FIG. 8.

Fig. 12 shows the execution of the passages for the thread-forming screws.

Fig. 1 shows the basic structure of a sectional steel frame 1 according to the invention. It consists of two side frames 2 and four cross bars 3, which to form scaffolding corners 8, 9, 10 11 (above) and 12, 13, 14 and 15 (below) - are connected.

FIG. 2 shows the scaffolding corner 14 according to FIG. 1, that is to say the rear left scaffolding corner in the lower region of the profiled steel scaffold 1 in FIG. 1, namely from the inside of the profiled steel scaffold 1. A horizontal frame part 16 and a vertical frame part 17 are connected to a cross member 3 on this frame corner 14. At the junction of the frame parts 16 and 17 of the side frame 2, an inwardly cranked fastening tab 18 of the frame part 17 can be seen, which is on the inside of an outer leg 4 of the

Frame part 16 rests. The fastening tab starts from a miter edge 25 which is parallel to a miter edge 26 of the adjoining frame part. The fortified Cleaning tab 18 has openings 19 with passages 20 in which thread-forming screws 39 engage.

The cross bar 3 has two fastening tabs 21, 22 which are provided in the same way with openings 23 and associated passages 24. These two fastening tabs 21 22 are also cranked inwards and rest on intermediate legs 7 of the frame parts 16 and 17 of the side frame 2 and are screwed to them.

FIG. 3 shows the scaffolding corner 13 according to FIG. 1, which is located in the lower area at the front right, seen from the outside. A horizontal frame part 16 and a vertical frame part 17 are connected to a cross member 3 on this frame corner 13. At the junction of the frame parts 16, 17 of the side frame 2, the miter edges 25 and 26 can be seen, behind which the not visible cranked fastening tab 18 of the horizontal frame part 16 bears against the vertical frame part 17 and is screwed to it by means of thread-forming fastening screws 39. The fastening tabs of the cross member 6, which are not visible, are also cranked and, in the manner mentioned, lie on the inside of the intermediate legs of the frame parts 16 and 17. Here, too, thread-forming fastening screws 39 ensure a firm connection.

4 shows a development of the frame part 16 of a side frame 2 according to the present invention. The frame part 16 has asymmetrically formed ends 31 and 32. At the first end 31 is located on the outer leg 4

Miter edge 26 with the fastening tab 18 projecting therefrom or protruding therefrom. Openings 23 with passages 24 are located therein. Furthermore, FIG. 4 shows a tongue 27, which is inserted into a slot 28 of the subsequent frame part 17 during assembly of the profile frame 1 for guiding and positioning the parts. Due to the asymmetrical design of the ends 31 and 32 of the frame part 16, there is such a slot 28 at the second end 32. At the first end 31 there are also lowered through openings 44 for receiving fastening screws 39 for a cross member 3 and slots 42 for receiving tabs 41 the cross bars 3 are provided.

The second end 32 has the aforementioned miter edge 26, which is opposed to a miter edge 25 when two frame parts 16, 17 are assembled. There are also through openings 44 for the fastening screws 39 and slots 42 for the tongues 41 of the cross bars 3 provided with countersinks.

4, a frame part 16 is produced in a known manner by folding or profiling, which is shown in FIGS. 5, 6 and 7 in views that are at right angles to one another. When profiling or folding, the mentioned outer leg 4, a subsequent inner end leg 5, an outer end leg 6 and an intermediate leg 7 connecting the outer leg 4 to the outer end leg are formed, all of which follow one another at right angles and best from the Fig. 7 have apparent proportions.

FIG. 5 shows a plan view of the frame part 16 for a side frame 2 produced from the development according to FIG. 4, only the parts clearly visible in this view being shown for a better overview. The parts not shown in this figure are in the other views (Figures 4, 6 and 7) well recognizable. At the first end 31 is on

Outer leg 4 arranged the cranked fastening tab 18. The lowered through openings 44 for receiving fastening screws 39 for a cross member 3 are located on the intermediate leg 7. Furthermore, this illustration shows the aforementioned tongue 27 and the slot 28 on the outer end leg 6. The second end 32 with the miter edge 26 has the aforementioned with countersinks provided through openings 40 for receiving fastening screws 39.

FIG. 6 shows a front view of the frame part 16 produced from the development according to FIG. 4 from the inside. In particular, the outer leg 4 with its miter edges 25 and 26 and the fastening tab 18 protruding from the miter edge 25 is visible here. The position of the openings 19 with their passages 20 in the fastening tab 18 and the through openings 44 is also illustrated. As an essential feature of the ends 31 and 32, the arrangement and design of the gradations mentioned is shown. These start from the longitudinal edges 29 and 39 of the outer leg 4, whereby the length of the miter edges 25 and 26 is shortened accordingly. The gradations at the end 31 are formed as recesses 33 and 34 and at the end 32 as projections 35, 36. When the frame parts 16 and 17 are joined together, the projection 35 at the first end near the longitudinal edge 29 and the recess 33 at the second end 32 of the frame part 17 engage in one another. Likewise, the projection 40 of the recess 34 located near the longitudinal edge 30 interlock. The gradations form support surfaces for the frame parts to be connected to one another in each case, which effectively supplement the connection of the frame parts 16 and 17 by the fastening screws 39. 6 also shows the tongue 27 projecting from the inner end leg 5 and the slots 42 arranged in the outer end leg for the cross bars 3. The outer end leg 6 is shortened at both ends 31, 32, namely by the width of the fastening tabs 21 and 22, which as a result can be placed directly on the intermediate legs 7 of the frame parts 16, 17 and fastened there.

FIG. 7 shows a side view of the frame part 16 produced from the development according to FIG. 4 for a side frame 2. The inwardly bent fastening tab 18 with the openings 19 and the passages 20 surrounding them enables a flush connection with subsequent frame parts, the Insert tongue 27 facilitates the guiding and positioning with the subsequent frame part during assembly and, when assembled, contributes to improving the stability of the scaffold.

8 shows a development of a cross member 3 according to the present invention. In the cross member 3, fastening tabs 21 and 22 are provided on both sides, which are bent in the final state, and which serve to engage in the side frame 2. Openings 23 with passages 24 surrounding them for thread-forming fastening screws 39 are arranged in the fastening tabs 21, 22 in order to be able to establish the connection to the frame parts 16, 17 in the region of the intermediate legs 7, as has already been mentioned.

Furthermore, the cross member 4 has tongues 37 which are inserted into slots 42 of the frame parts 16, 17 in order to achieve precise positioning during assembly and good corner rigidity in the assembled state of the scaffold. hold .

FIG. 9 shows a plan view of the cross beam 3 produced from the development according to FIG. 8. For a better overview, only the parts of the invention that are clearly visible in this illustration are shown. The cross bar 3 has fastening tabs 21, 22 which are bent inwards by the thickness of the material at both ends and which are provided with passages 24 for the thread-forming fastening screws 39. Furthermore, the cross member 3 has tongues 37 which, as already mentioned, are inserted into slots 38 of the frame parts 16, 17 in order to obtain precise positioning during assembly and good corner rigidity in the assembled state of the scaffold.

FIG. 10 shows a front view of the cross member 3 produced from the development according to FIG. 8. Here too, only the parts of the invention that are clearly visible in this illustration are shown for a better overview. The cross bar 3 has cranked fastening tabs 21 and 22 at both ends, which are provided with openings 23 and passages 24 for the thread-forming fastening screws 39. Furthermore, the cross member 3 has tongues 37, which, as already mentioned, are inserted into slots 38 of the frame parts 16, 17 serving as counter elements in order to obtain precise positioning during assembly and good corner rigidity in the assembled state of the scaffold.

FIG. 11 shows an end view to illustrate the profile shape of the cross member 3, which is made from the sheet metal part according to FIG. 8. This profile shape has two main legs 41 and 42 which are at right angles to one another and end legs 43, 44 extending from these. The fortification see 21 is located on the inner main leg 41, while the fastening tab 22 extends from the outer main leg 42. Both fastening tabs are - like the fastening tabs 18 - cranked inwards by the thickness of the material, so that there are flush transitions at all scaffolding corners 8 to 15 (FIG. 1).

FIG. 12 shows in detail the execution of the passages 24 for the thread-forming screws 39 in the cranked fastening tabs 21, 22 in a section along the line XII-XII in FIG. 10. These passages 24 are necessary in particular for thread-forming fastening screws because of the low material thickness of the frame parts they get a sufficient hold.

The invention creates a screwed steel profile frame with great deformation rigidity, which has flush transitions between the profile pieces on the entire circumference. The increased stability is also achieved in that, in addition to the cranked fastening tabs for the screw connection, additional elements are provided for a form-fitting support in the form of stamped tongues.

Claims

claims

1. Profile steel frame (1) from profile pieces connected to one another by fastening screws (39) with a profile shape having at least three legs angled in the same direction, the ends of the profile pieces forming scaffold corners (8, 9, 10, 11, 12, 13, 14, 15) are arranged to overlap each other, characterized by the following features: - The profile pieces are as frame parts (16, 17) with a first profile shape and as cross bars (3) with a second

Shaped profile,

- A side frame (2) is composed of the frame parts (16, 17), which has outer legs (4) lying in a frame plane, two side frames (2) are connected to one another by the cross bars (3), the outer legs (4) are provided at the ends (31, 32) of the frame parts (16, 17) with a mitred edge (25, 26), at a first end (31) of each frame part (16, 17) is one of the mitred edge (25, 26) projecting inwardly cranked fastening tab (18) with openings (19) for fastening screws (39), - each frame part (16, 17) is at the first end (31) with at least one projecting tongue (27) and at the second end (32 ) with a slot (28) for receiving a tongue (27) of a further frame part (16, 17) to be connected to the frame part (16, 17) and at both ends (31, 32) with slots (38) for tongues (37 ) the cross bars (3),

- The cross bars (3) have inward at both ends. cranked, with openings (23) for fastening screws (43) provided fastening tabs (21, 22) for connection to the frame parts (16, 17).

2. Profile steel frame according to claim 1, characterized by the following features: the frame parts (16, 17) of the side frame (2) have an inner end leg (5) located on the inner edge of the side frame (2) and adjoining the outer leg (4), - at the outer edge of the side frame (2) there is an outer end leg (6) facing the interior of the section steel frame (1), the outer leg (4) and the outer end leg (6) are connected by an intermediate leg (7), - the plug-in cables ( 27) and the slot (28) for a subsequent frame part (16, 17) are arranged on the inner end leg (5), the slots (36) for engaging tabs (35) of the cross bars (3) are located in the outer end leg (5), - Through openings (40) for fastening screws (39) of the fastening tabs (21, 22) of the cross bars (3) are located on the intermediate leg (7).

3. Profile steel frame according to claim 2, d a d u r c h g e k e n n z e i c h n e t, that the outer end legs (6) at the ends (31, 32) of the frame parts (16, 17) according to the width of the fastening tabs (21, 22) of the cross bars (3) are shortened.

4. Profile steel frame according to one of the preceding claims, characterized in that the miter edges (25, 26) in front of the longitudinal edges (31, 32) of the outer leg (4) of the frame parts (16, 17) and that at the transitions from the miter edges (25, 26) to the inner end leg (5) and to the intermediate leg (7) there are rectangular steps, which are recesses (33, 34) at the first end (31) and at the second end ( 32) are designed as projections (35, 36) such that support surfaces for the mutual abutment of two frame parts (16, 17) to be connected are formed.

5. Profile steel frame according to one of the preceding claims, since you rchgek characterized in that the openings (19, 25) for fastening screws (39) in the cranked fastening tabs (18, -21, -22) both the frame parts (16, 17) of the side frame ( 2), as well as the cross bars (3), are provided with passages (20, 24).

6. Profile steel frame according to one of the preceding claims, that the through openings (40) for fastening screws (39) in the frame parts (16, 17) and the cross bars (3) are designed as countersunk openings.

7. Profile steel frame according to one of the preceding claims, since you rchgek characterized in that the cross bars (3) have two mutually perpendicular main legs (41, 42) and adjoining end legs (43, 44), each main leg (41, 42) Both ends have a projecting inwardly cranked fastening tab (21, 22) and the end legs (43, 44) are provided with a tongue (21, 22) at each end.

8. Use of a section steel frame (1) according to any one of the preceding claims, characterized by the use as Field scaffolding of an electrical switchgear or as a frame for a control cabinet.