EP0622503B1 - Fixed or mobile scaffold with clamping arrangement - Google Patents

Abstract

Scaffolding as fixed or mobile scaffolding, composed of at least one bottom access platform which is releasibly fastened on horizontal crossmembers in the vicinity of the ground and are at a mutual distance from one another. In order to eliminate the play between the access platform and the crossmembers, the invention provides that a clamping fitting (8) which is connected to the access platform engages around the crossmember (5), in a positively locking manner in each case, and can be clamped onto the crossmember (5) in a frictionally locking manner by a pivotable closure part (16). <IMAGE>

Description

The invention relates to a clamp fitting for work scaffolding according to the preamble of claim 1. Such work scaffolds are available as mobile or stand scaffolding and consist essentially of a lower boarding level, which is referred to as an access platform, which is arranged horizontally and from which vertical scaffolding frames extend upwards, which may be connected by diagonal struts, with further work platforms attached to the top of the scaffolding frame.

In the manufacture of such work scaffolds, there is the disadvantage that the individual platforms, either the lower entry platform or the work platforms above, are relatively difficult to connect to the associated trusses. The problem with the connection with the horizontal trusses is because the associated fittings usually have a play, which leads to the fact that the individual, horizontally arranged and vertically spaced stages tend to play and thereby make the work scaffold unstable.

So far it is only generally known to provide the individual stages on the front side with claw-like fittings, the claws of these fittings being open at the bottom, so that there was the possibility of hanging these claws over the horizontal basic cross members and thus fastening these individual platforms .

The disadvantage, however, was that the claws did not Provide protection against rotation and allow lateral play. The individual stages were therefore not attached to the horizontal trusses of the work scaffold without play.

The publication "Plettac safety mobile scaffoldings made of aluminum", brochure of the company PLETTAC GmbH, Plettenberg, September 1991, makes a work scaffold that can be used as a stand or mobile scaffold and to be regarded as the closest state of the art with at least one lower, horizontal, near-ground and a mutually spaced trusses releasably attached boarding platform become known.

The releasable attachment of at least the access platform to the crossbar is carried out by means of a clamp fitting connected to the access platform and encompassing the crossbar in a form-fitting manner can be.

The previously known from GB-A-2 209 553, consisting of a one-piece round body and pivotably attached to this, two-part clamping part with tension spring screw device, is only suitable for non-slip scaffold part locking on round profiles.

The invention has for its object to provide a clamp fitting for play-free, slip-resistant fastening of scaffolding parts, such as horizontal work platforms, to horizontal polygonal cross members.

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

The main feature of the present invention is the clamp fitting, which offers a practically positive and non-positive connection between the respective platform and the associated cross member.

It is important that the crossbeam is polygonal, e.g. as a square, rectangular profile, roof profile or the like and it is ensured that the clamping fitting is adapted in its inner circumference to the outer profile of the cross member, so that the clamping fitting encompasses this cross member in a form-fitting manner and can be clamped to it.

It is therefore expressly avoided in the invention a round profile as a traverse, because it has been found that due to the frictional engagement alone, the resulting closing forces are not sufficient to connect the respective platform with the associated traverse without play. This is where the invention comes in, which in addition to a frictional connection also provides a positive connection for the clamp fitting.

The prerequisite is always that the clamp fitting is designed in its inner profile in such a way that it positively encloses the profile of the crossmember to be enclosed and that at least one locking part is also present, which can be pivoted with a corresponding screw on one side of the crossmember that, in addition to the positive engagement mentioned, there is still a frictional engagement, ie the clamp fitting on the crossbar tensions.

In a further development it is provided that the clamp fitting is easy to open and close, which is associated with the advantage that when the Clamp fitting the entire entry platform can be moved in relation to the fixed crossmember and also the scaffolding connected to the crossmember.

According to the invention, the clamp fitting is not only used for fastening the respective platforms (entry platform and work platforms), but also on the undersides of the respective scaffold frames, which are equipped with the same clamp fittings. When the respective clamp fittings are opened, the scaffold frames and the platforms can be moved horizontally along the crossbars.

This is necessary when working on walls, where it may be necessary to attach the access platform and the work platforms above it to the trusses in order to then push the entire structure along the fixed crossbar away from the wall when the work progress changes.

What is important is the continuous adjustment with the help of the mentioned clamp fitting, i.e. the entire structure of the scaffolding can be moved continuously on the trusses on the floor, which is new.

This shift can be adapted to the progress of work without the need to partially dismantle the entire scaffolding in order to achieve a gradual shift (repositioning), as in the prior art.

In the following the invention is based on only one Execution path illustrating drawings explained in more detail. Further features and advantages of the invention are evident from the drawings and their description.

Figur 1:

schematisiert die teilweise Vorderansicht eines Fahrgerüstes in einer ersten Arbeitsstellung,

Figur 2:

das Arbeitsgerüst nach Figur 1 in einer zweiten Arbeitsstellung,

Figur 3:

der Aufbau der Einstiegsbühne in einem ersten Arbeitsschritt,

Figur 4:

der Aufbau der Einstiegsbühne in einem zweiten Arbeitsschritt,

Figur 5:

der Aufbau des Fahrgerüstes mit aufgestecktem Gerüstrahmen,

Figur 6:

eine Darstellung des Klemmbeschlages.

Show it:

Figure 1:

schematized the partial front view of a mobile scaffold in a first working position,

Figure 2:

1 in a second working position,

Figure 3:

the construction of the entrance platform in a first step,

Figure 4:

the construction of the entrance platform in a second step,

Figure 5:

the construction of the mobile scaffold with the scaffold frame attached,

Figure 6:

a representation of the clamp fitting.

According to FIGS. 1 and 2, the mobile scaffold 1 consists of a base platform 2, which in turn consists of horizontal crossbeams 5 which form a mutual distance, only the foremost crossbeam 5 being visible in FIGS. 1 and 2.

The two trusses 5 are connected to one another via a so-called access platform 3.

An adjustment foot 6 is attached to each cross member 5 and has rollers 7 that can be locked on its underside can.

For the construction of the mobile scaffolding, it is known to fasten so-called scaffold frames 4 on the cross beams 5, the access platform 3 and the scaffold frames 4 being fastened to the cross beams 5 with clamping fittings 8 according to the invention.

The further design of the scaffolding is not shown in the drawings.
Further work platforms are then suspended above the scaffolding platform 3 on the scaffold frames 4, it also being possible to use the clamp fittings 8 according to the invention.

It is important that the scaffold frame 4 and the access platform 3 can be moved continuously along the cross members 5 in the direction of the arrow 9. For this purpose, the clamp fittings 8 according to the invention are released; the mentioned parts are then shifted according to FIG. 2 and the clamping fittings 8 are then tightened again.

It is important, moreover, according to FIGS. 3 to 5, that the entire work scaffold can be erected by a single person with the aid of the clamp fittings according to the invention.

For this purpose, according to FIG. 3, the access platform 3 with the clamp fittings 8 attached to it is first attached to one side of the crossmember 5 and fastened, the clamp fittings 8 located here on the opposite side remaining free.

According to FIG. 4, the opposite traverse is then used moved up with the adjustment feet 6 attached and the boarding platform 3 is raised and the clamping fittings 8 are placed around the cross member 5 in the open state and tightened, so that the state according to FIG. 3 results.

In this way, the work scaffold can be further assembled by a single person, for example by after attaching the scaffold frames 4, which are also fastened to the crossbeams 5 with the clamping fittings 8, further diagonal struts 11 are fastened to the scaffold frames 4.

According to FIG. 6, the clamp fitting 8 is fastened to the end face of the respective entry platform 3 with the aid of tabs 13. The tabs 13 are welded or screwed or riveted.

The clamp fitting consists of the tabs 13, which are connected in one piece with the material or via corresponding connection points to the vertical leg 14 of the clamp fitting. The leg 14 is connected to a horizontal leg 15, on the outer, free end of which a pivot pin 17 is fastened, on which a locking part 16 is pivotally arranged. A slot 20 is arranged on the underside of the closing part 16.

A further pivot pin 18 is arranged on the leg 14, on which the pivot bearing for a clamping screw 22 is formed. This extends below the cross member 5 and is provided with a ring nut 19.

To fasten the clamp fitting, the closing part 16 is thus rotated about the pivot pin 17 until it puts on the outside of the cross member 5. It is then pivoted the clamping screw 22 about the pivot pin 18 until the screw enters the slot 20 in the leg 16, and then the ring nut 19 is tightened so that the locking part 16 clamps against the outside of the cross member 5 and at the same time Leg 14 generates the corresponding back pressure.

There is thus a clamping and at the same time a form fit because the legs 14, 15, 16 mentioned are adapted to the shape of the crossmember 5.

It has already been pointed out at the beginning that the invention is not restricted to a square profile of a traverse. Other shapes of the legs 14, 15, 16 can also be used in order to always achieve a positive fit on the associated cross member 5.

Moreover, it can still be seen from the drawings that the cross member 5, which is designed as a square profile, is connected to the adjustable feet 6 with vertical round parts 12, each round part being designed as a sleeve, through which a spindle 10 extends. The spindle 10 is firmly connected to a roller bearing 23. A spindle nut 21 is rotatably seated on the spindle 10, so that the height of the roller bearing 23 and thus the roller 7 can be adjusted continuously.

DRAWING LEGEND

1

Mobile scaffolding

2nd

Base stage

3rd

Boarding platform

4th

Scaffolding

5

traverse

6

Adjustable foot

7

role

8th

Clamp fitting

9

Arrow direction

10th

spindle

11

Diagonal bar

12th

Round part

13

Tab

14

leg

15

leg

16

Striker

17th

Pivot pin

18th

Pivot pin

19th

Ring nut

20th

slot

21

Spindle nut

22

Clamping screw

23

Roller bearings

Claims (5)

1. Fixed or mobile scaffolding, consisting of at least one lower entry platform (3) which is detachably secured onto one of the girders (5) which are horizontal in position of use, close to the ground and have a reciprocal distance from each other, in which for the detachable securing at least of the entry platform (3) on the girder (5) a clamping mounting (8), connected with the entry platform (3), grasps around the girder (5) with a form fit, characterised in that the clamping mounting (8) can be clamped with a swivellable closure part (16) additionally with a force fit to the girder (5) which is constructed as a multiple-sided section.
2. Scaffolding according to Claim 1, characterised in that the clamping mounting (8) has an inner profiling adapted to the section of the girder (5).
3. Scaffolding according to Claim 1 or 2, characterised in that the clamping mounting (8) is slidable on the girder (5) with the closure part (16) swivelled away and opened.
4. Scaffolding according to one of Claims 1 to 3, characterised in that the clamping mounting (8) is connected to the end face of the object (3,4), which can be clamped on, with a first shank (14), which joins on to a second shank (15) arranged perpendicularly thereto, at the front end of which the closure part (16) is swivellably arranged, at the lower, free end of which a clamping screw (22) is secured which is swivellably mounted on the first shank (14), which clamping screw (22) is in engagement with the closure part (16).
5. Scaffolding according to one of Claims 1 to 4, characterised in that the first and second shanks (14, 15) of the clamping mounting (8) are connected with each other in one piece material.

Images