EP0861952B1 - Scaffold with vertically movable outtrigger - Google Patents

Description

The invention relates to a scaffold with lifting and Lowerable boom according to the preamble of claim 1 or 6 or 7. It is known here, on work scaffolding and Work platforms boom to attach, the pivoting are formed, so they in different pivotal positions with an attached at the free end of the boom strut Stand on the ground and sit against the scaffold Secure tilting.

It is also known, the boom essentially from an upper, longer-trained boom strut form, to which attaches a shorter, lower support strut. It is otherwise known, the boom strut and the Support strut with associated clamp couplings on the Frame profile of the work scaffold or the work platform too attach, with pivot points for the boom strut and the support strut are defined.

As a rule mobile scaffolds are used whose Location by wheels or rollers attached to the scaffolding can be changed. In the working position of the Mobile scaffold or the platform are fixed the boom and immovable on the ground, while, if that Mobile scaffolding will be moved to another work place, the Booms need to be raised to a procedure at all to enable.

For this purpose it is known to raise the boom, that one the lower support strut in the area of their on the frame profile suspended from the mobile scaffold arranged clamp, or one of the clamp couplings (either the clamp for the Boom strut or for the support strut) on the mobile scaffold at least partially to move them around so raise the boom foot.

However, the aforementioned change measures have the Disadvantage that must be remembered that the boom is then brought back to its support position, if the mobile scaffold has arrived at the place of use. This is considerable workload, because the previously made Loosen the clamps or move the Clamps or unhooking the strut then has to be reversed again. A big accident risk exists then, if it is forgotten, the previously made To undo changes to the boom, because then the scaffolding is not properly on the Outrigger is supported on the ground and the tipping safety of the Mobile scaffolding is no longer guaranteed. Another Danger is that it is assumed that the made Changes were reversed, but that for example, the frame profile of the mobile scaffold arranged clamps no longer properly tightened were, so that with appropriate load of the mobile scaffold the boom yields in its articulation on the mobile scaffold and the mobile scaffolding can even fall over.

With US-5,267,631A is a stabilizing apparatus for a Scaffolding became known on both sides of the scaffolding is arranged and one lower, one horizontal sliding support strut and a vertical, oblique extendible cantilever brace supported on the ground includes. The boom stay is with one, at the upper part connected to the scaffold hinged and hinged in this swivelable and obliquely exposed to the scaffold. The lower strut is with one end with a slidable retaining sleeve of the boom strut hinged pivotally connected, and with its other end in one horizontal guide tube horizontally displaceable added. Two of these horizontal guide tubes are for Stabilization via connecting pins coupled together. A determination of the length of the guide tube outstanding horizontal strut and their determination It is achieved by clamping screws, which also the Angle between the support strut and boom strut determined becomes. In the use state of the scaffold these are Tightening screws tightened and the Stabilisierungsapparat so rigid and functional. Should the scaffolding now locally be offset, then the clamping screws are loosened and the Stabilization apparatus folded (or folded up if there are rollers on the scaffold) to work on the new one Construction site of the scaffold again flipped to the ground and to be clamped. Will now the clamping of the support strut forgotten in the guide tube or improperly made, then the entire stabilizing apparatus has no or only decreased support function as the shift of Support strut on the boom strut virtually limitless and is unlimited, because the sliding holding sleeve a unlimited displacement allowed on the boom strut.

FR-1 147 627A shows only a foldable support strut, which is arranged on a boom strut. This is the Linkage of the support strut to the cantilever strut in such a way changeable, that the effective length of the support strut can be influenced. Here is the pivot point of this Support strut in one connected to the boom strut Holder arranged, but this holder is not fixed to the Boom stay connected. The pivot point within this Holder is not movable or repositionable, but he is trained only swivel, because a bendable support strut is shown, which is especially true at Photo tripod is used. So it exists here not at all the disadvantage that the cantilever strut is not height adjustable, because it can only to a certain height be set. The height is determined by the application of the ring at the central center mast, which is no Height adjustment of the boom strut according to the present Invention represents.

The invention is therefore the object of a Mobile scaffold or a working platform or a portable To develop the frame so that the boom without loosening the Attachment points of the struts of the boom or moving arranged on the frame profile of the mobile scaffold Clamps, from his driving position in his Support position and can be brought back.

To solve the problem, the invention by the Technical teaching according to claim 1 or 6 or 7 characterized.

An essential feature of the invention is that the linkage the support strut either on the frame profile of the mobile scaffold or on the boom strut is changeable by a distance, which changes the effective length of this strut.

An essential feature of the invention is therefore that the effective length of the support strut compared to the fixed length of the boom strut changeable is trained. There are several possibilities and several embodiments, all of the Thought concept of the present invention comprises should.

In a first preferred embodiment of the invention it provided that the pivot point of the support strut on the Boom strut is formed in a holder and that this pivot point in a certain way displaced or is formed pivotable or repositionable, namely such that in the one pan, shift or Plug position of this pivot point the effective length of Support strut is short, so that the boom a gets downslope situation, which ensures that the am free end of the jib arranged stand on the ground rests.

If, however, the effective length of the support strut is extended, in accordance with the invention, the articulation point is displaced, reconnected or is pivoted, then raises the boom strut with her free outer end from the ground and the boom is thus free, leaving the mobile scaffold or the work platform free is movable.

It is of particular advantage that the increase in the Jib necessary shift of the articulation point of the Support strut on the boom strut is limited so that the Boom stay with her stand just about one exactly defined mass from the ground, e.g. by 2 cm, around that The mobile scaffold is still properly moved on a floor can. On the other hand, this lift height is so low that also a tipping over of the mobile scaffold during the Procedure is excluded, because just the foot of the Boom strut this relatively small distance from the Soil also during the process.

This causes, even if accidentally not properly lowered and on the ground launched boom always only a small amount of Stand is given above the ground and - if that Mobile scaffolding would be prohibited - would Nevertheless, a safeguard against tipping is guaranteed. This is a significant advantage over the arrangements of the prior art, because in these known Arrangements either then completely removed the strut which was no longer safe for the boom or completely removed the clamp couplings for the boom which made the boom inoperative.

In a second embodiment of the present invention provided that the change in the effective length of the Support strut not on the outer, free, boom-side end but that same effective shortening takes place via a removable, pivotable or movable Anlenkpunkt on the room profile side attachment of Support strut on the scaffold is done.

It was stated earlier that the effective length of the Support strut is changed by the fact that the pivot point of Support strut is changed to a corresponding opposite. There are several possibilities:

In a first embodiment, it is provided that this Anlenkpunkt is slidably guided in a backdrop, wherein the backdrop is oriented so that the invention provided effective change in the length of the support strut is reached.

In a second embodiment, it is provided that instead the displacement is a transposition of the articulation point, wherein a transfer, e.g. by means of screws and associated Nuts can be done.

It may be provided here a Umsteckbild that e.g. the point of articulation from a lower position to an upper one Position can be transferred to an associated holder.

Likewise, it is provided in a third embodiment, that instead of the pivoting the displacement of the Anlenkpunktes via a spring-loaded bolt takes place, i. The bolt can move from one detent position to another be brought, whereby at the same time the pivot point of his one end position is brought to its other end position.

In a further embodiment of the invention it is provided that this articulation point in the range of Lever arm is arranged so that with the pivoting of a hand lever, the entire lever arm from a position in another one can be pivoted, thus creating the free end This lever of the previously described pivot point of Support strut is arranged.

In a further embodiment of the invention it is provided that not the pivot points of the support strut on Mobile scaffold or on the boom strut in their effective Be changed, but that instead the effective length of the support strut itself is changed. For this It can be provided that the support strut from a Telescope tube is made and this telescope tube to a certain stage is designed retractable or extendable. For this purpose, a bayonet scenery can be provided, the in such a way that the one in the bayonet scenery movable articulation point in a first stop position is detectable and in a second stop position.

The displacement of the articulation point in this bayonet-type Kulisse can here via a rotary sleeve or over a Sliding sleeve take place, which ensures that the Link point from one stop position to the other Stop position of the backdrop is moved and hereby also the effective length of the support strut is changed.

The subject of the present invention provides not only from the subject of the individual Claims, but also from the combination of individual claims among themselves.

All in the documents, including the summary, disclosed details and characteristics, in particular those in the Drawings shown spatial training as claimed essential to the invention, as far as they individually or in Combination over the prior art are new.

In the following the invention is based on several Explanation performing drawings explained in more detail.

Figur 1:

Seitenansicht eines Fahrgerüstes mit einem Ausleger in der Stützstellung,

Figur 2:

eine vergrößerte Darstellung der Anordnung nach Figur 2,

Figur 3:

die gleiche Darstellung wie Figur 1 mit dem Ausleger in Fahrstellung,

Figur 4:

die vergrößerte Darstellung der Anordnung nach Figur 3,

Figur 5:

Schnitt durch einen Halter,

Figur 6:

schematisiert als zweites Ausführungsbeispiel die Darstellung, wie ein rahmenseitig angeordneter Anlenkpunkt der Stützstrebe verschiebbar ausgebildet ist,

Figur 7 :

schematisiert ein weiteres Ausführungsbeispiel mit Darstellung der Veränderung der effektiven Länge der Stützstrebe durch eine Kulissenführung.

Figur 8:

schematisiert die Veränerung der effektiven Länge der Stützstrebe durch Verschwenken des Anlenkpunktes.

Show it:

FIG. 1:

Side view of a mobile scaffold with a boom in the support position,

FIG. 2:

an enlarged view of the arrangement of Figure 2,

FIG. 3:

the same view as Figure 1 with the boom in driving position,

FIG. 4:

the enlarged view of the arrangement of Figure 3,

FIG. 5:

Cut through a holder,

FIG. 6:

schematized as a second embodiment, the representation of how a frame side arranged articulation point of the support strut is designed to be displaceable,

FIG. 7:

schematically illustrates another embodiment showing the change in the effective length of the support strut through a slotted guide.

FIG. 8:

schematizes the Veränerung the effective length of the support strut by pivoting the pivot point.

In Figure 1, the part of a rolling tower 1 is shown, wherein it can be seen that on the frame section 2 of the rolling tower 1, a boom 3 is arranged. The boom 3 consists of an upper boom strut 4 with arranged at its free, front end stand 8, which rests on the floor 9 and a shorter support strut 5, which engages in the manner of a simple lever arm in a holder 10 on the boom strut 4 on the one hand and on the other hand is pivotally mounted via a clamping coupling 7 on the frame profile 2.
Similarly, the boom strut 4 is pivotally attached to the frame profile 2 in an upper clamping coupling 6, wherein a pivot point 11 is defined. In contrast, a pivot point 12 for the support strut 5 is formed in the lower clamping coupling 7.

Important in the embodiment of Figures 1 to 4 is now that the support strut side pivot point 15 at the Holder 10 is designed to be displaceable, so that the effective Length of the strut 5 with respect to the fixed length of the Boom strut 4 can be changed.

Moreover, the support strut 5 forms in its point of articulation 15 also a pivot point 13 in the holder 10th

FIG. 2 shows that the displacement of the articulation point 15 takes place in a backdrop 16, wherein the pivot point 15 in lower stop 20 of the gate 16 is located. This is the effective length of the support strut formed short and thus is also the stand 8 on the floor 9.

Is now by briefly raising the support strut 5 of Link point 15 in the backdrop in the direction of arrow 33rd pivoted, then the pivot point 15 reaches the top Stop 19.

The shape of the backdrop 16 is chosen so that the plant the pivot point 15 in the two stops 19,20 is advantageously self-locking, i. she can do not change alone.

In Figure 2 is the sake of clarity a Swivel radius 14 marked by the lower Stop 20 goes and its center in the pivot point 12th the support strut 5 on the frame profile 2 has. Now it is important that the shaping of the backdrop and thus the Displacement direction 17 of the pivot point 15 is selected so that the displacement direction 17 of the pivot radius 14 itself differs by a deviation 18.

So if the support strut 5 is raised in the direction of arrow 33, then leads the pivot point 15 in the direction 17 its Shift in the scenery 16 off, which effectively the Length of the support strut 5 is extended. This leads to the Situation in Figure 3, namely that by the foot 8 um a distance 21 from the ground 9 is lifted.

FIG. 4 shows this case, where it can be seen that the Anlenkpunkt 15 is in the upper stop 19 of the gate 16 located.

In all embodiments, it is important that the holder 10 fixed to the boom strut 4 is connected to a certain To ensure occupational safety. The holder 10 should therefore not possible in his position on the boom strut 4 to be changed. These are appropriate Attachment rivets 22 (Figure 5) are provided which the holder 10 with the boom strut 4 connect.

The holder 10 is otherwise made of a U-shaped Metal part with two mutually approximately parallel Side cheeks 23,24, at their front, free ends of the opposite slot-shaped scenes 16 have, which are parallel to each other and each other aligned.

The two scenes 16 are penetrated by the bolt 34, which has a screw head 25 on its one side, which rests against the outside of the side wall 23.
On the other side of the bolt 34 in this case a nut 26 is screwed onto the bolt, which is connected to a handle 27. In this way, it is ensured that despite the advantageously provided self-locking the displacement of the articulation point 15 (shown by the bolt 35), there is no unintentional displacement in the scenery. It is therefore with the said nut 26 generates a clamping force, so that therefore the pivot point 15 (shown by the bolt 34) in any intermediate position between the stops 19 and 20 can be determined.

For safety reasons, however, it is preferred if only in the stop situations a corresponding Clamping by the mother 26 takes place.

FIG. 4 shows that the base 8 only has a small amount Measure from the ground 9 lifts. This has the advantage that even if the change in the effective length of the strut from the Travel position of the boom to the support position of the boom was forgotten, but a certain tip over security for the Mobile scaffolding during the procedure and also during the unauthorized use in driving position is secured.

In the figures 3 and 6 is shown schematically as a further embodiment, that the previously shown with reference to Figures 1 to 4 effective change of the articulation point 15 of the support strut 5 in the holder can also be realized on the frame side of the mobile structure 1.
It is shown in Figure 6, that this pivot point 15, which is now formed in the pivot point 12, also in an oblong slot 28 is slidably formed and is displaceable or pivotable between two stops. Here again it is shown that deviating from the pivot radius 14, the pivot point 12 has around the pivot point 13, the displacement direction 17 deviates in the gate 28 by the dimension 18 in order to achieve the previously said shortening or lengthening of the effective length of the support strut 5 ,

FIG. 7 shows, as a further exemplary embodiment, that the effective length of the support strut 5 also by a change the length of the support strut itself can be achieved.

In this case, the support strut 5 consists of two nested telescopic part tubes 29,30, in the area of a backdrop 31 is arranged.
The one sub-pipe 29 is connected to a bolt 32 which is displaceable and fixable in the other part of the pipe 30 arranged in the gate 31 between the two stops 19,20.
In this case, the effective length of the two partial tubes can then be lengthened or shortened by the dimension 35.

FIG. 8 shows, as a further exemplary embodiment Possibility that the effective length of the support strut through Pivoting the articulation point 15 can be changed. Here, a holder 36 is arranged on the boom strut 4, in which in a pivot point 37, a lever 38 pivotally is stored, the at its front, free end of the Anlenkpunkt 15 carries, which is rotatable with the end of Support strut 5 is connected. The lever is in its upper Pivoting position (as in Figure 8 in solid lines drawn), then the effective length of the Support strut long and thus raises the stand 8 of the boom off the ground. If, however, the lever 38 in the direction of arrow 39th swung down to get into position 38 ', then the effective length of the support strut 5 is shortened and the boom sets with his stand 8 on the floor. 9 on.

drawing Legend

1

Mobile scaffold (working platform)

2

frame profile

3

boom

4

boom strut

5

support strut

6

Clamping coupling on top

7

"below

8th

stand

9

ground

10

holder

11

Pivot point above

12

"below

13

" Left

14

swing radius

15

articulation

16

scenery

17

displacement direction

18

deviation

19

Stop (upper)

20

Stop (lower)

21

distance

22

rivet

23

side cheek

24

"

25

screw head

26

mother

27

handle

28

scenery

29

partialtube

30

partialtube

31

scenery

32

bolt

33

arrow

34

bolt

35

measure

36

holder

37

pivot point

38

Lever 38 '

39

arrow

Claims (7)

1. Work scaffolding (1) comprising a support arm (3) which can be raised and lowered, wherein the support arm (3) consists substantially of a pivotable arm brace (4) fastened to the work scaffolding (1) and a support brace (5) pivotably connected to the work scaffolding (1) and the arm brace (4), wherein the articulation of the support brace (5) can be changed in such a way that the effective length of the support brace (5) is influenced thereby and the angle between the frame profile (2) of the work scaffolding (1) and the arm brace (4) can be changed thereby, characterised in that the link point (15) of the support brace (5) is arranged in a holder (10; 7) rigidly connected to the arm brace (4) or the work scaffolding (1) and is designed to be displaceable or reinsertable in this holder (10; 7) so that the effective length of the support brace (5) can be changed.
2. Work scaffolding according to claim 1, characterised in that the link point (15) is designed as a screw or bolt (34) which is displaceably guided in a link (16; 28) of the holder (10; 7).
3. Work scaffolding according to claim 1, characterised in that the link point (15) is designed as a screw or bolt (34) which can optionally be reinserted in a plurality of receiving holes of the holder (10; 7).
4. Work scaffolding according to claim 1, characterised in that the link point (15) is designed as a spring-loaded screw or bolt which can be displaced in the holder (10; 7) between at least two blocking positions.
5. Work scaffolding according to claim 2, characterised in that the holder (10; 7) consists of an approximately U-shaped metal part with two side cheeks (23, 24) formed approximately parallel to each other, which have at their leading free end, mutually opposing, slot-shaped links (16; 28) flush with one another.
6. Work scaffolding (1) with a support arm (3) which can be raised and lowered, wherein the support arm (3) consists substantially of an arm brace (4) pivotably fastened to the work scaffolding (1) and a support brace (5) pivotably connected to the work scaffolding (1) and the arm brace (4), wherein the articulation of the support brace (5) can be changed such that the effective length of the support brace (5) is influenced thereby and the angle between the frame profile (2) of the work scaffolding (1) and the arm brace (4) can be changed thereby, characterised in that the link point (15) of the support brace (5) is arranged so as to be pivotable in an articulated manner at the free end of a lever arm (38) which is pivotably fastened in a holder (36) which is rigidly connected to the arm brace (4) or the work scaffolding (1), so that the effective length of the support brace (5) can be changed.
7. Work scaffolding (1) comprising a support arm (3) which can be raised and lowered, wherein the support arm (3) consists substantially of an arm brace (4) pivotably fastened to the work scaffolding (1) and a support brace (5) pivotably connected to the work scaffolding (1) and the arm brace (4), wherein the articulation of the support brace (5) can be changed such that the effective length of the support brace (5) is influenced thereby and the angle between the frame profile (2) of the work scaffolding (1) and the arm brace (4) can be changed thereby, characterised in that the support brace (5) consists of at least two part tubes (29, 30) which are inserted into one another and can be telescoped, wherein a bolt (32) is arranged on one part tube (29), the bolt (32) being displaceable and fixable in a link (31) arranged in the other part tube (30) between at least two stops (19, 20), so the length of the support brace (5) is itself changeable.

Images