EP1785549A1

EP1785549A1 - Horizontal stiffening diagonal for system scaffolding

Info

Publication number: EP1785549A1
Application number: EP05077568A
Authority: EP
Inventors: Petrus Johannes Lambertus De Leeuw
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-10
Filing date: 2005-11-10
Publication date: 2007-05-16

Abstract

Stiffening diagonal (2) for the horizontal stiffening of scaffold systems (1), which consist of vertical modular system posts (4) and horizontal modular longitudinal and cross girders (5, 6), wherein the ends (7) are adjusted in a specific inventive way for a direct centric discharge of the pressure forces to said vertical system post (4) and wherein further means are applied of the tensile fixed eccentric connection of the stiffening diagonal (2) with the rosette (3) of the vertical system post.

Description

The present invention relates to a stiffening diagonal for mainly the horizontal stiffening of scaffold systems, consisting of vertical modular system posts and horizontal modular longitudinal and cross girders, in which the ends of the horizontal longitudinal and cross girders and stiffening diagonals are rapidly connectable to the rosettes of said system posts, in which floor boards are mounted onto said modular horizontal cross girders and said stiffening diagonals are mounted with recessed positions below the floor boards.
Horizontal stiffening diagonals in combination with work platforms are difficult to realise with this kind of system scaffolds, because the rosettes for fixing the diagonals are difficult to reach due to the presence of work platforms. Therefore this kind of stiffening is done with standard scaffold tubes and loose scaffold couplings, which are clamped onto the tubes of the posts or horizontal girder. This is the reason why, for the known systems, when mounting and/or applying horizontal stiffening diagonals underneath the work platform, no easy and mechanically optimal working ends are available for said horizontal stiffening diagonal.
It is the aim of the present invention to develop a suitable end of the recessed positioned horizontal stiffening diagonal, in which the pressure or tensile forces on the horizontal stiffening diagonal is discharged optimally to the system post and in which the stiffening diagonal is simultaneously loaded as favourably as possible.
For this purpose, the ends of the recessed positioned stiffening diagonal according to the invention, is further developed in such an inventive way, as defined by appended claim 1.
The advantage is a primary, most simple embodiment of the invention, in which the stiffening diagonal can be clicked with normal muscle power directly from below into the rosettes of the vertical system posts of the scaffold.
Further, the ends of the recessed positioned stiffening diagonals according to a further development of the invention are constructed in such an inventive way, that the ends of said recessed positioned stiffening diagonals are constructed of a bottom part for direct free or cantilevered support against the vertical system post and a hinged thereto coupled canting upper part provided with a vertical hook-shaped element with projection for a tensile fixed connection to the rosette of the vertical system post, which vertical hook-shaped element with projection can be placed from below into the rosette of the system post and is fixed by back canting and after that the upper part is lockable with means to the bottom tube-shaped part.
The advantage is, that for the discharge of the pressure forces in the stiffening diagonal to the system post this stiffening diagonal, as much as possible with regard to the mechanical phenomenon, is centrically buckling loaded and for the discharge of the tensile forces in the stiffening diagonal to the rosette of the system post this stiffening diagonal is eccentrically loaded due to the recessed position. The maximum permitted compressive stress in the rather slim stiffening diagonal as a result of the buckling load is always much less than the maximum permissible tensile stress as a result of the tensile force on the stiffening diagonal.
Further, the horizontal stiffening diagonal according to the invention is further developed in such a way, characterized in that said bottom part is finished hollow cylinder-shaped at the end for shape-fitted adjoining against said vertical system post.
The advantage is, that the pressure force in the horizontal stiffening diagonal is discharged centrically onto the system post as much as possible, through which the horizontal stiffening diagonal has a maximum resistance against the phenomenon buckling.
Furthermore, the horizontal stiffening diagonal according to the invention is further developed in such a way, characterized in that, said canting upper part is constructed of top and bottom hook-shaped turned parts, which is stiffened horizontally with a U-shaped constructed part, whereas means are applied at the end for locking onto said bottom part, whereas the vertical projection of the centre mass of said canting upper part with locking means is situated at some distance next to the hinge point of the canting upper part and bottom part.
The advantages are, that a connecting mechanism has been developed which can be put into the rosette of the system post from below, then cants during the application and after that cants back with a projection over the rosette, as the projection of the centre of gravity of the canting upper part is situated at some distance next to the hinged point of the canting upper part and bottom part.
Furthermore, the horizontal stiffening diagonal according to the invention is further developed in such a way, characterized in that, said means for locking consist of a key bolt with key.
The advantage is a locking mechanism, which can easily be done.
Said means for locking can also consist of a key plate with key or a standard bolt and nut.
The preferred constructions of the invention will be described by way of example, and with reference to the accompanying drawing.
In which:

Fig. 1: shows a view in oblique projection of a part of the scaffold system provided with a horizontal stiffening diagonal with the ends according to the invention;
Fig. 2: shows a side view across the line II-II of figure 1;
Fig. 3A/C: show side views of the coupling of the ends of the horizontal stiffening diagonals to the rosette of the vertical system post in several phases;
Fig. 4: shows a view in oblique projection of the end of the horizontal stiffening diagonal;
Fig. 5: shows a cross-section across the line V-V of figure 4;
Fig. 6: shows a side view across the line VI-VI of figure 1; and
Fig. 7: shows a cross-section across the line VII-VII of figure 6.

Figure 1 shows a view in oblique projection of a part of the scaffold system 1 provided with a stiffening diagonal 2. Between the rosettes 3 of the system posts 4, horizontal modular longitudinal and cross girders 5, 6 and also said recessed positioned horizontal stiffening diagonal 2 are applied.
In figure 2 is shown a view across the line II-II of figure 1 of the welded or attached end 7 to the stiffening diagonal. At the end of the horizontal modular longitudinal girder 5 a normal beam end 8 is welded with normal vertical key connection 9. Tensile fixed attachment of the end or of the horizontal stiffing diagonal 2 to the rosette 3 of the vertical system post 4 is done by locking the canting upper part 10 to the bottom part 14 by means of a key bolt 12 with key 13 or key plate with key or a standard bolt with nut.
Figures 3A up to 3C show side views of the coupling of the end 7 of the horizontal stiffening diagonal 2 to the rosette 3 of the vertical system post in various phases.
Figure 3A shows the stiffening diagonal 2 with its specific end 7 with the vertical hook-shaped element with projection 11 which is pushed from below into the opening of the rosette 3 of the vertical system post 4. Said end 7 consists of a bottom part 14 and a hingeable thereto coupled canting upper part 10 provided with a vertical hook-shaped element with projection 11.
In figure 3B the projection 11 is pushed to the left through the slanting surface thereof to go through the opening in the rosette 3, wherein the hinging upper part 10 cants to the left and, for example, moves the key bolt 12 upwards.
In figure 3C the projection 11 is slided through the opening of the rosette 3 and by the eccentrically applied weight of the hinging canting upper part, this upper part 10 cants back to the right and the key bolt 12 moves downwards at the same time. Next, the horizontal key 13 can be positioned and the end 7 of the stiffening diagonal 2 is then tensile-fixed coupled to the vertical system post 4.
Figure 4 shows a view in oblique projection of the end 7 of the horizontal stiffening diagonal 2. It shows that when the projection 11 falls over the edge of the rosette 3 and the upper part 10 is canted back with the key bolt 12, the key 13 can be positioned and the horizontal stiffening diagonal is tensile-fixed connected with the rosette 3 of the vertical system post 4.
Figure 5 shows a cross-section across the line V-V of figure 4. This figure 5 shows, that the vertical part 15 on the top side of the projection 11 forms a slanting surface 16 for guidance through the opening of the rosette 3 and at the bottom side forms a hinge 17 with the bottom tube-shaped part 14. The bottom part 14 can be bent back cylindrically in a square tube-shape on the left side or be provided with a cylindrical end plate (not shown) to plainly joint against the vertical system post 4 for absorbing the pressure forces. On the right side of the bottom part 14 a straight end plate 18 is welded for welding the horizontal stiffening diagonal 2 onto it, welding a roughly U-shaped constructed part 19 thereon mechanically strengthens the hinging canting upper part 10.
Figure 6 shows a simple alternative of the connection of the stiffening diagonal 2 to the rosette 3 of the vertical system post 4 across the line VI-VI of figure 1.
Figure 7 shows a vertical cross-section across the line VII-VII of figure 6. The ends 7 of the stiffening diagonal 2 are adjusted, for example by a welded part-cylindrical plate for direct cantilevered support with pressure forces against the vertical system post 4. Further, the end 7 is provided with a rigid vertical pin 20 with side locking means 21 on the top. It is stated, that the locking means 21 can consist of a spring loaded protruding part or ball 22, through which the stiffening diagonal 2, after snapping into the opening of the rosette 3, cannot fall out due to the gravity.
Finally it has to be emphasized, that the above description constitutes preferred embodiments of the invention and that further modifications are possible for the recessed coupling of the stiffening diagonal 2 with on the ends 7 for applying below the working platform, without departing the scope of this patent description.

Claims

Stiffening diagonal for mainly the horizontal stiffening of scaffold systems (1), consisting of vertical modular system posts (4) and horizontal modular longitudinal and cross girders (5, 6), in which the ends of the horizontal longitudinal and cross girders (5, 6) and stiffening diagonals (2) are rapidly connectable to the rosettes (3) of said system posts (4), in which floor boards are mounted onto said modular horizontal cross girders (5) and said stiffening diagonals are mounted with recessed positions below the floor boards, characterized in that, the ends (7) of said recessed positioned stiffening diagonals (2) are adjusted for direct cantilevered support against the vertical system post (4) and provided with a vertical pin (20) with locking means (21) for a stable tensile-fixed connection of said stiffening diagonal (2) to the rosette (3) of said vertical system post (4).
Stiffening diagonal as claimed in claim 1, characterized in that, said locking means (21) consist of a spring-projecting cross part (22) on the top side of said vertical pin (20), such as, for example, in the form of a ball with spring applied in a horizontal bore.
Stiffening diagonal as claimed in claim 1, characterized in that, that the ends (7) of said recessed positioned stiffening diagonals (2) are constructed of a bottom part (14) for direct cantilevered support against the vertical system post (4) and a hinged thereto coupled canting upper part (10) provided with a vertical hook-shaped element with projection (11) for a tensile-fixed connection to the rosette (3) of the vertical system post (4), which vertical hook-shaped element with projection (11) can be placed from below into the rosette (3) of the system post (4) and is fixed by back canting and after that the upper part (10) is lockable with means to the bottom tube-shaped part (14).
Stiffening diagonal as claimed in claim 3, characterized in that, said bottom part (14) is finished hollow cylinder-shaped at the end for shape-fitted adjoining against said vertical system post (4).
Stiffening diagonal as claimed in claims 3-4, characterized in that, said canting upper part (10) is constructed of top and bottom hook-shaped turned parts (15), which is stiffened horizontally with a U-shaped constructed part (19), wherein means are applied at the end for locking onto said bottom part (14).
Stiffening diagonal as claimed in claim 3, characterized in that, said means for locking consist of a key bolt (12) with key (13).
Stiffening diagonal as claimed in claims 3-5, characterized in that, the vertical projection of the centre mass of said canting upper part (10) with locking means (12, 13) is situated at some distance next to the hinge point (17) of the canting upper part (10) and the bottom part (14).
Stiffening diagonal as claimed in claims 3-5, characterized in that, said bottom part (14) and canting upper part (10) are constructed of plate material, such as, for example, constructional steel.
Stiffening diagonal as claimed in claims 3-5, characterized in that, said bottom part (14) and canting upper part (10) are constructed of casting, such as, for example, cast steel or aluminium.