EP0623715B1 - Scaffold with extensible base - Google Patents

Abstract

The present invention relates to a scaffolding with adjustable base width, in the case of which horizontal crossmembers (3), assuming a mutual distance from one another, are connected to one another by an access platform. Vertical scaffolding frames (2) with horizontal working platforms are arranged on the crossmembers (3) and connected to the crossmembers. In order to be able to change the base width in a simple and operationally reliable manner with low production costs, it is proposed to fit an extension arm (8) at the free ends of the crossmembers (3) by means of a coupling fitting (7), an adjustment foot (5') being fitted on said extension arm.

Description

The invention relates to a scaffolding according to the preamble of claim 1.
Here, the work scaffolding consists of horizontal, mutually spaced trusses, which are connected to each other by an entry platform. At the end of each traverse an adjustable foot is arranged in a manner known per se. Vertical scaffold frames are arranged on the trusses, which are connected by diagonal struts, the scaffold frames being connected to horizontal work platforms, which work platforms are arranged parallel to the lowest entry platform lying on the crossmember. With such work scaffolds there is the problem that with higher structures it is necessary to increase the standing width.

According to the document "plettac safety mobile scaffolding made of aluminum", brochure of the company plettac GmbH, Plettenberg, September 1991, is a working scaffold consisting of horizontal, mutually spacing, trusses, the length of which can be changed and which are joined together by an entry platform are connected ("modular system"), vertical scaffold parts are attached to the cross members and an adjustable foot is detachably arranged at each end of the cross members, and an extension arm with an adjustable foot is attached to at least one free end of each cross member by means of a coupling fitting.

Furthermore, DE 30 14 212 A1 discloses a scaffolding designed as a mobile scaffold consisting of two lateral conductors, one or more covering panels arranged one above the other, and components that are adjustable in length or height.

A disadvantage of these technical solutions is the lack of adaptability to rapidly changing working conditions.

The invention is therefore based on the object of creating a work scaffold with a variable standing width for simple and reliable adaptability to the respective working conditions.

To achieve the object, the invention is characterized by the technical teaching of claim 1.

An essential feature of the invention is that with the aid of a coupling fitting at the free end of a cross member, an extension arm with an adjustable foot is pivotally attached.

A work scaffold with a relatively small stand width is therefore proposed, with simple and reliable adaptability to the respective working conditions being ensured.

If this scaffolding is to be used at another construction site where a larger working height is required, the stand width must also be increased accordingly. For this purpose, the adjustable foot is simply removed from one end of the respective traverse, and a coupling fitting is attached at this point, which is connected to an additional extension arm.

The extension arm corresponds to the extension of the traverse and has a receptacle (round part) for holding the adjustable foot at its free, outer end.

In this way it is ensured that the work scaffold can be subsequently enlarged from a relatively small standing width to a larger standing width using simple means.

This has the advantage that the work scaffold corresponds to a standard size with a small stand width and can therefore be produced inexpensively because the need to increase the stand width is eliminated.

For some applications, if an increase in the standing width is desired, an extension arm is simply added, which is coupled to the crossbar with an associated coupling fitting and which in turn has the receptacle for the adjustable foot at its outer end.

To increase the standing width of a work scaffold, only at least two extension arms are required.

There are several options for coupling the respective extension arm with the assigned crossbar:

First of all, it is preferred if a clamping fitting is used as the coupling fitting, which is constructed essentially like a scaffolding coupling, in order to fasten the extension arm to the tubular part of the crossmember, in order to create a first of two existing fastenings.

The second attachment of the extension arm is that either the tubular part of the traverse is gripped with an eyelet of the extension arm and thereby a dimensionally stable bracket is created.

In a second embodiment, instead of using an eyelet, a beveled hook part is proposed, which engages around the crossbeam from below.

In both embodiments, it is preferred if in the working position the extension arm forms the continuation of the longitudinal axis of the cross member, in order to avoid that the extension arm inadvertently extends to the cross member in the working position.

However, it is provided that when the clamp fitting is loosened, the extension arm can be pivoted inwards and outwards, for example in order to be able to drive through the work scaffold through narrow passages and the like.

In the first-mentioned solution, where the extension arm is formed with a lower eyelet which encompasses the tubular part of the traverse, the adjusting foot must first be removed from this tubular part when the extension arm is being installed, so that it can then be mounted at the end of the extension arm. The crosshead must be supported during this time.

In order to avoid this, the second solution is provided, which provides that the extension arm can be attached to this tube part when the adjustment foot is located in the tube part. The adjustable foot can then remain at this point and the extension arm then carries a further adjustable foot at its outer end, so that additional support is provided via two adjustable feet arranged at a distance from one another.

In the following, the invention is explained in more detail with reference to drawings showing several possible embodiments. Here, from the drawings and their description, further features and advantages of the invention that are essential to the invention emerge.

Figur 1:

die Stirnansicht des unteren Teils eines Arbeitsgerüstes mit zwei verschiedenen Standbreiten,

Figur 2:

das nach Figur 1 umgerüstete Arbeitsgerüst mit vergrößerter Standbreite,

Figur 3:

die Draufsicht auf die Traverse,

Figur 4:

die Seitenansicht der Traverse,

Figur 5:

die Draufsicht auf den Kupplungsbeschlag,

Figur 6:

die Seitenansicht des Kupplungsbeschlages,

Figur 7:

der Kupplungsbeschlag in montiertem Zustand in Schwenkstellung,

Figur 8:

der Kupplungsbeschlag nach Figur 7 in Arbeitsstellung,

Figur 9:

die Seitenansicht der Traverse,

Figur 10:

die Draufsicht auf die Traverse,

Figur 11:

die Seitenansicht eines Kupplungsbeschlages in einer zweiten Ausführungsform,

Figur 12:

die Draufsicht auf den Kupplungsbeschlag nach Figur 11,

Figur 13:

der montierte Kupplungsbeschlag nach den Figuren 11 und 12,

Figur 14:

Schnitt gemäss der Linie XIV-XIV nach Figur 11.

Show it:

Figure 1:

the front view of the lower part of a scaffolding with two different stand widths,

Figure 2:

the work scaffold converted according to FIG. 1 with an enlarged standing width,

Figure 3:

the top view of the traverse,

Figure 4:

the side view of the traverse,

Figure 5:

the top view of the coupling fitting,

Figure 6:

the side view of the coupling fitting,

Figure 7:

the coupling fitting in the assembled state in the swivel position,

Figure 8:

7 in the working position,

Figure 9:

the side view of the traverse,

Figure 10:

the top view of the traverse,

Figure 11:

the side view of a coupling fitting in a second embodiment,

Figure 12:

the top view of the coupling fitting according to Figure 11,

Figure 13:

the assembled coupling fitting according to Figures 11 and 12,

Figure 14:

Section along the line XIV-XIV according to Figure 11.

In the working scaffold 1 according to FIGS. 1 and 2, the standing width 10 is to be increased to the standing width 11. The work scaffold consists, in a manner known per se, of horizontal crossbeams 3 which are at a mutual distance from one another and which (not shown in the drawing) are connected to one another by corresponding horizontal platforms.

At least one scaffold frame 2 is attached to each crossmember 3 with the aid of associated clamp fittings 4. An adjusting foot 5 is arranged on the outer sides of each cross member 3 and is adjustably held in a tube part 6 connected to the cross member 3.

According to FIG. 1, the work scaffold 1 now has the right adjustable foot 5 at the stand width 10.

In order to maintain the standing width 11, it is provided according to the invention that an extension arm 8 is mounted at the location of the right adjusting foot 5 with the aid of a coupling fitting 7, which in turn has the tubular part 6 on its outside, on which an adjusting foot 5 'can be mounted.

In this case, either the right adjustment foot 5 can remain in place, or it can be removed (in FIG 1 shown in broken lines) and at the location of the adjustable foot 5 '.

In this way, the standing width 10 has been increased to the standing width 11 in a simple manner. In Figure 2, the work scaffold 1 is shown with an increased standing width 11.

The assembly of the extension arm 8 on the crossmember takes place in that at the free end of the extension arm 8 an eyelet 12 is arranged at the bottom, which comprises the lower part of the tubular part 6, so that in the assembled state the central axis 13 through the tubular part 6 of the central axis 13 of the Coupling fitting 7 corresponds.

To retract the eyelet 12, the scaffold bracket 22 forming part of the coupling fitting 7 is opened. According to FIG. 5, the scaffold bracket 22 essentially consists of a closing part 15, which is pivotably attached to a stationary holder 21 via a pivot pin 17. At the opposite end of the closing part 15 there is a slot through which a hammer head screw 18 engages, onto which a ring nut 14 is screwed.
It is a scaffold bracket 22 known per se.

Figures 7 and 8 show the relationships according to Figures 3 to 6 in the assembled state. It can be seen here that the eyelet 12 encompasses the lower part of the tubular part 6, while the upper part of the tubular part is enclosed by the scaffold tip 22.

The pipe part 6 then engages the spindle 9 of the adjustable foot 5, the height of the adjustable foot can be adjusted by turning the spindle nut 16.

FIGS. 9-14 show a second embodiment of a coupling fitting. In the upper area, the coupling fitting 23 in turn has the previously described scaffold bracket 22, the encirclement of the lower part of the tubular part 6 now being solved differently.

Here, in the extension of the extension arm 8, a connecting part 20 is provided, on the free end of which a hook part 19 is formed. This hook part 19 has a cranked hook which at least partially encompasses the rectangular profile of the cross member 3 according to FIG. The hook part thus forms a receptacle 24 which is open at the top and which engages in a form-fitting manner on the underside of the cross member 3, and the hook of the hook part which is bent upwards bears against the side faces of the cross member 3.

This ensures absolute security against rotation, i.e. the extension arm 8 is always mounted in the assembled state in the extension of the longitudinal axis of the cross member 3. A pivoting according to Figure 7, as described with reference to the coupling fitting 7, is not given in this embodiment.

A pivoting is possible, however, when the scaffold bracket 22 is opened and the extension arm with the coupling fitting 22 attached to it is moved downward such that the hook part 19 comes out of engagement with the profile of the cross member 3.

Drawing legend

1

Scaffolding

2nd

Scaffolding

3rd

traverse

4th

Clamp fitting

5

Adjustable foot 5 '

6

Pipe part

7

Clutch fitting

8th

Extension arm

9

spindle

10th

Stand width

11

Stand width

12th

eyelet

13

Central axis

14

Ring nut

15

Striker

16

Spindle nut

17th

Pivot pin

18th

Hammer head screw

19th

Hook part

20th

Connecting part

21

holder

22

Scaffold

23

Clutch fitting

24th

admission

Claims (7)

1. Scaffolding, consisting of horizontal girders (3) mutually spaced apart from each other, the length of which girders (3) is changeable,and which are connected with each other by an access platform, in which vertical scaffolding parts are fastened on the girders (3) and at each end of the girders (3) an adjustment foot (5,5') is detachably arranged and also at least at one free end of each girder (3) an extension arm (8) is arranged with an adjustment foot (5,5') by means of a coupling mount (7), characterised in that the extension arm (8) is arranged so as to be swivellable.
2. Scaffolding according to Claim 1, characterised in that the swivel axis (13) of the coupling mount (7) is arranged so as to be vertical.
3. Scaffolding according to Claim 1 or 2, characterised in that the extension arm (8) has at its free end a vertical tube part (6) in which the adjustment foot (5.5') is adjustably mounted.
4. Scaffolding according to Claim 3, characterised in that the coupling mount (7) is constructed substantially from a clamping mount (23) and from a second mounting arranged at a vertical distance therefrom.
5. Scaffolding according to Claim 4, characterised in that the clamping mount (23) is constructed as a scaffolding coupling in order to embrace the tube part (6) of the girder (3).
6. Scaffolding according to one of Claims 4 or 5, characterised in that the second mounting is constructed in the form of an eye (12) which embraces the tube part (6) of the girder (3).
7. Scaffolding according to one of Claims 4 and 5, characterised in that the second mounting is constructed as a chamfered hook part (19) which at a horizontal distance from the tube part (6) of the girder (3) has a mounting (24) which partially embraces the girder (3).

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