WO1994024389A2

WO1994024389A2 - Scaffolding

Info

Publication number: WO1994024389A2
Application number: PCT/DE1994/000378
Authority: WO
Inventors: Erich Albert
Original assignee: Erich Albert
Priority date: 1993-04-07
Filing date: 1994-04-02
Publication date: 1994-10-27
Also published as: CZ285418B6; WO1994024389A3; EP0693153B1; DE59404041D1; EP0693153A1; ATE158049T1; CZ257095A3; DE9305290U1

Abstract

The proposal is for scaffolding with a rear rail, a vertical scaffold pole, a wedge having a bearing edge and a longitudinal slot running obliquely thereto and serving to clamp the rear rail and two brackets fitted on the vertical scaffold pole at the desired height for the rear rail, whereby a pin passes through the ends of the brackets and the longitudinal slot in the wedge and clamps the outer end of the rear rail between the brackets, in which between the wedge (4) and the rear rail (2, 3) there is a connecting member (10) which can be moved in a direction perpendicular to the axis of the rear rail (2, 3) and lies flat against the bearing edge (14) and the rear rail (3).

Description

Scaffolding

The invention relates to a scaffolding with a back railing, a vertical scaffold tube, a wedge, which has a contact edge and an obliquely extending longitudinal slot and serves to clamp the back railing and two straps attached to the vertical scaffold tube at a desired back railing height, one of which Bolt passes through the ends of the tabs and the longitudinal slot of the wedge and the back rail engages with its outer end between the tabs.

Scaffolding on buildings is primarily used for exterior work that takes place at a greater height and is generally constructed with vertically running scaffolding tubes on which horizontal ones

Floors are suspended in order to enable the working people to reach the desired parts of the building. Diagonal struts are used for stabilization, while horizontal back railings on the outside of the scaffolding are connected to the vertical scaffolding tubes about a meter above the floors and prevent the working people from falling down.

From DE-PS 38 01 354 a device for releasably fastening the back railing to a vertical scaffold tube is known, which has a wedge with a contact edge and an inclined towards it

Substitute BJ Longitudinal slot used to fix the back railing. Horizontal straps, which are angled at their ends, are attached to the vertical scaffold tube, for example by a welded connection, and are drilled through coaxially on the end face in order to fix the longitudinal slot of the wedge by means of a screw. The flat ends of the back railing are suspended between the vertical scaffold tube and the wedge and fastened to the top of the wedge by hammer blows. Due to the inclination of the contact edge in relation to the longitudinal slot, the end of the back railing is pressed against the vertical scaffold tube and fixed. The angle of inclination is approximately 10 ° and is referred to below as α.

The disadvantage of the known fastening devices is, in particular, that the contact edge abuts only a small area at the ends of the back railing, so that it can undesirably be deformed when the wedge is driven in due to the high pressure. Furthermore, in the known device it is to be regarded as disadvantageous that only a reduced force is used to fix the backrest when vertical hammer blows onto the wedge, while a component deforms the bolt.

Proceeding from this, the invention is based on the problem of designing a scaffolding in such a way that the back rails are securely fastened and deformations are avoided.

Spare sheet According to the invention the object is achieved in that a link drive is arranged between the wedge and the back railing, which can be displaced in a direction perpendicular to the axis of the back railing and lies flat against the contact edge and the back railing.

The main idea of the invention is to see between the back railing and the contact edge of the

Assign Keils a link drive that can be moved in the direction perpendicular to the axis of the back railing. Since it lies flat against the contact edge and the back railing, the pressure exerted on these elements is reduced, so that undesired deformations are avoided. A pendulum movement of the link drive around an axis perpendicular to the scaffold tube is provided within a small angular range and prevents the back railings from deforming even if the corresponding surface is not exactly vertical. In addition, slightly deformed back railings are possible because the link drive pivots until it lies flat. The fixation is not impaired by the rotatability, since a pendulum movement with a fixed wedge is impossible.

If horizontal, outward forces act on the back railing, the link drive transmits them via the wedge and the bolt to the vertical scaffold tube. Since the back railing lies against it and is supported on the brackets

REPLACEMENT LEAF transmit downward and horizontally inward forces via the brackets or directly to the vertical scaffold tube. If they are directed vertically upwards, they are transferred to the tabs by the link drive via its bearing. If they exceed a threshold value (determined by the clamping force with which the back railings are fixed), a sliding process takes place between the back railing and the wedge. The threshold is increased, since the surface is now exactly vertical, while the clamping force in known clamping devices splits into two components, only one of which (reduced by a factor cos α) can be used for fixing.

The advantages of the invention consist primarily in the fact that the back railings are securely fixed, that they are not deformed, and that existing back railings and scaffold tubes can continue to be used.

In conventional scaffolding, if a vertical force acts on the wedge to fix the back railing, a force component deforms the bolt, while the clamping force on the back railing is reduced. It is therefore recommended that the longitudinal slot of the wedge is vertical and the contact edge is inclined with respect to the vertical. The associated surface of the link drive encloses a corresponding angle with the vertical.

If a vertical force acts on the wedge, there is no component deforming the bolt, all of the energy is generated by the link drive transferred to the back railing and the clamping force is increased (by a factor 1 / cos α). A horizontally running upper face of the wedge makes it easier to fix it with a hammer.

In one embodiment of the invention, it is recommended to connect the link drive with a horizontal pin that is perpendicular to the direction of movement of the link drive. This pen engages

Recesses in the tabs, which allow displacement of the link drive in a direction perpendicular to the axis of the back railing and transmits vertical force components to the sheet. The pin allows the link drive to oscillate, so that slightly deformed back rails can still be used. Another advantage is that upward forces on the back railing turn the link drive in such a way that the wedge is pressed down and fixed.

In particular, when dismantling a scaffold, direct access to the fastening device for the back railings is sometimes not possible, which is why removal from a distance is necessary. In order to ensure that the wedge rotates outwards after it has been released, for example with the aid of a rod, it is preferred that the longitudinal slot bends outwards at its lower end. The distance between the wedge and the link drive means that the back railings can be removed without hindrance in order to dismantle the scaffolding. lent.

It is preferred that the distance between the longitudinal slot and the contact edge in the bent area is constant or reduced, so that the wedge remains in the outwardly rotated position after loosening and a distance between the railing that is sufficient to remove or position it the link drive and the back railing are created. Another advantage is that one person can hold the back railing in the middle during assembly and insert it into the tabs at both ends. In known fastening devices, tilting often occurs, so that two workers are required for hanging or one person has to change between the two end faces of the back railing.

There is a high risk of injury from the outwardly protruding, sharp-edged surfaces of the wedge of conventional fastening devices for back railings. It is therefore proposed to design the tabs in the shape of a "U". The end faces of the longer, outer legs are on the vertical scaffold tube, for example, by a

The welded connection fastens and covers the inner, adjacent legs, which enclose the wedge to improve occupational safety.

The protruding screw heads and nuts of conventional fastening devices also endanger the working personnel. The bolt expediently runs between the inner ones

REPLACEMENT LEAF Legs of the tabs so that neither the screw head nor the nut can be reached from the outside, which greatly reduces the risk of injury.

The accessibility of the screw connection is improved by holes which run coaxially to the bolt in the outer tabs. They make it easier to retighten the nut and make it possible to replace the bolt and / or the wedge if it is damaged. The diameter of the holes is larger than that of the screw head and the nut.

A disadvantage of the known fastening devices is that, in order to create the required space, the wedge depends on the

Number of back rails to be fixed must be rotated by 180 °. However, if the longitudinal slit is longer than the quotient of the strength of a ridge and the sine of the angle between the contact edge and the longitudinal slit, this is not necessary

Turn around, since the horizontal displacement of the link drive caused by the insertion of the wedge is greater than the thickness of a back railing. One or two of these elements can therefore be fixed.

The angle between the contact edge and the longitudinal slot determines the clamping force on the back railing and the required length of the longitudinal slot of the wedge. If you choose this angle very small, you get a high clamping force, but you need a very long wedge, while a large angle only requires a short wedge, but an inevitable

REPLACEMENT LEAF visible loosening of the connection favors. In particular, it is proposed that this angle be greater than 8 ° and less than 15 °, since such an angle ensures great security, but the wedge is easy to handle.

Further details, features and advantages of the invention can be found in the following description, in which an exemplary embodiment of the invention is explained in more detail with reference to the drawings. It shows a schematic representation in

Figure 1 is a side view of an inventive connection between a vertical scaffold tube and two back rails.

FIG. 2 shows a side view of a connection according to FIG. 1.

It can be seen in FIG. 1 that the vertical scaffold tube (1) is connected to a tab (7) which serves to fix two flat ends of back rails (2, 3). A wedge (4) has a vertically running longitudinal slot (5) through which a bolt (6), which is provided with a nut and is fixed on the bracket (7), engages. When the wedge is inserted in the vertical direction, the distance (which is inclined relative to the longitudinal slot (6)) is reduced. ten) contact edge (14) to the vertical scaffold tube (1) until the only horizontally movable backdrop drive (10) touches both the contact edge (14) and the outer back railing (3). The sloping contact edge (14) causes a vertical force to split into two components, of which the force directed perpendicular to the surface results in a clamping force that fixes the back railings. A pin (8) is arranged in horizontal recesses (9) in order to enable movement of the link drive (10) only in the desired direction and to transmit vertical force components to the tab (7). In the drawing it can be seen that upward forces on the back railings (2, 3) cause the link drive (10) to rotate, which fix the wedges (4), so that optimum securing takes place. The upper side of the wedge (4) runs horizontally in order to facilitate driving in by means of vertical hammer blows. The lower area of the longitudinal slot, which is bent outwards, causes the wedge (4) to pivot outwards as soon as it reaches the bolt (6), so that the back railings (2, 3) can be easily removed. The distance between the longitudinal slot (5) and the contact edge (14) is constant in the area below the break point in order to enable the rotation movement. In order to be able to fix one or two back railings (2, 3), the longitudinal slot (5) is so long that the displacement of the link drive (10) is greater than the strength of a back railing (2, 3). In Figure 2 it can be seen that two U-shaped tabs (7, 13) are connected to the vertical scaffold tube (1). The end faces of the outer, longer legs are fixed to the vertical scaffold tube. The inner legs (11, 12) are used to connect the wedge (4) and the link drive (10) and, because the bolt (6) is arranged so as to be protected by the outer legs (7, 13), increase the safety at work Holes drilled coaxially to the bolt (6), not recognizable in the drawing, in the outer

Legs (7, 13) facilitate the replacement of a damaged bolt (6) or wedge (4).

The result is a scaffolding that makes unintentional loosening of the back railings (2, 3) difficult and improves occupational safety.

REPLACEMENT LEAF

Claims

PATENT CLAIMS

1. Scaffolding with a back railing, a vertical scaffold tube, a wedge that has a contact edge and an obliquely extending longitudinal slot and serves to clamp the back railing and two tabs attached to the vertical scaffold tube at a desired back railing height, one bolt being used Grips ends of the tabs and the longitudinal slot of the wedge and the back railing with its outer end between the

Tabs engages, characterized in that a link drive (10) is arranged between the wedge (4) and the back railing (2, 3), which is displaceable in a direction perpendicular to the axis of the back railing (2, 3) and on the contact edge (14) and on the back railing (3) lie flat.

2. Scaffolding according to claim 1, characterized gekennzeich¬ net that the upper end face of the wedge (4) hori¬ zontal and the longitudinal slot (5) extends vertically.

3. Scaffolding according to claim 1 or 2, characterized ge indicates that the link drive (10) with ei¬ nem perpendicular to its direction of movement, horizontal pin (8) is connected, which in a

REPLACEMENT LEAF Recess (9) engages in the tabs (7,13).

4. Scaffolding according to one of claims 1 to 3, da¬ characterized in that the longitudinal slot (5) of the wedge (4) is bent away from the scaffold tube at its lower end.

5. Scaffolding according to claim 4, characterized gekennzeich¬ net that the distance between the longitudinal slot (5) and the contact edge (14) is constant in the area below the kink.

6. Scaffolding according to one of claims 1 to 5, da¬ characterized in that the tabs (7, 13) are arranged in parallel and each have the shape of a "U" that the end faces of the outer, longer legs ( 7.13) of the "U" are connected to the vertical scaffold tube (1) and that the respective inner legs (7.13) are adjacent.

7. Scaffolding according to claim 6, characterized gekennzeich¬ net that the bolt (6) between the inner legs (11,12) of the tabs (7,13).

8. Scaffolding according to claim 7, characterized gekennzeich¬ net that coaxial holes are made in the outer legs (7,13) to the bolt (6).

Spare sheet

9. Scaffolding according to one of claims 1 to 8, da¬ characterized in that the longitudinal slot (5) of the wedge is longer than the quotient of the strength of a back railing (2,3) and the sine of the angle between the contact edge ( 14) and the longitudinal slot (5).

10. Scaffolding according to one of claims 1 to 9, da¬ characterized in that the angle between the contact edge (14) and the longitudinal slot (5) of the wedge (4) is greater than 8 ° and less than 15 °.