Scaffolding construction, in particular means for joining two or more of its posts in vertical position

Abstract: A scaffolding construction, in particular comprising H-shaped frames. The posts (1) of a frame are provided at the one end (4) with a bushing (5), of which the inner diameter is larger than the outer diameter of the post (1). The bushing (5) is provided with a recess (7) and with a staggered groove (8) lying opposite to it. The other end of a post (1) is provided with a pin (14) which can be fittingly received in the groove (8) and in the upper end of a post (8). In the horizontal position of the posts, its pins are inserted in the groove (8) via the recesses (7). During the angular rotation which the post (1) carries out while being swung into its vertical position, the pins (14) are guided by the grooves (8), and the posts by the recesses (7), so that so that the pins come to rest in the posts.

Description: The invention relates to a scaffolding construction as this is described in the preamble of claim 1. Such a scaffolding construction is known by GB-A-779 295. In this known construction a post must first be placed in a vertical position above the preceding post before the lower end of it can be brought in the upper end of the preceding post. Because in many cases no lifting means are available, this forms a heavy physical strain on the labourers who build up the scaffolding construction. Furthermore in most cases the position at wich the posts are joined together will be located at the level of a platform, since otherwise the next post cannot, or can only with difficulty, be brouht into a vertical position above the preceding post. That is to say, as long as a next post has not been placed on the preceding one, the platform cannot be provided with rests. This makes the assembly of the scaffolding less safe. The purpose of the invention is to remove these objections and to that end the features are applied as described in the characterizing portion of claim 1. During assembly, a post is brought into the horizontal position and moved in this direction, such that its pin falls into the groove and can come to rest in the recess. Following this, the post can be swung into the vertical position. Due to the weight of the post, its pin will lower automatically and move through the groove towards the upper end of the underlying post, and finally be received in there. Thus, a kind of hinge is formed between both posts, but without a fixed joint being present between the posts. Since the post to be assembled first can be brought into the horizontal position in the bushing of the preceding post, the bushing can be located at some distance above a platform. It is therefore possible to provide the platform directly with rests, so that the placing of the next post can be conducted safely. For limiting the width of the groove, it can be provided that the pin connected to the end of a post possess a square cross-section. Then, the width of the groove is required to be only slightly larger than the size of a side of the square. The wall thickness of the bushing, and therefore its production cost, can therefore be kept as low as possible. In using a pin with a square cross-section, it can be received more easily in a preceding post with a circular cross-section, than in the case in which the pin possess a circular cross-section. For optimum guidance of a post during its being swung from the horizontal position to the vertical position, the inner diameter of the bushing can be provided to be larger than the outer diameter of the post, and that the recess extends over less than half the circumference, and the width of the recess is sufficient for letting a post pass. The post swinging upwardly therefore experiences a better support in the direction perpendicular to the plane in which the post is being moved. Furthermore, it is achieved that the bushing is weakened as little as possible where the recess and the groove lie opposite to each other. It is also because of this that the wall thickness of the bushing can be kept limited. The manufacturing of the bushing can be simplified because the groove extends till the other end of the bushing. Since the lower edge of the bushing is welded to the post, or fixed to it in another fashion, no deformation of the bushing will occur. To prevent a post in vertical position being pulled out of the underlying post, a locking pin can be used, which can be inserted in bores-in-line in a pin joined to a post and the portion of the post in which the pin can be received. A rapid construction of a scaffolding according to the invention can be achieved when two parallel and spaced posts are joined together by at least one cross beam extending across the posts, such that a substantially H-shaped frame is obtained. The pins of the two posts of such a frame can then be inserted simultaneously in the grooves of the bushings of a frame that has been positioned previously, after which the frame can be swung into the vertical position. It is to be noted that as such more or less H-shaped frames are known. However, a disadvantage of these known frames is that they are susceptible to damage or deformation, which leads to the distance between centrelines of the posts not being fixed. This causes an obstruction during the assemblying of the frames. In using the pin and the bushing according to the present invention, one obtains the advantage that both pins of a frame still can be simply inserted in horizontal position in the bushings of an underlying frame, even with relatively large deviations with respect to the nominal distance between centrelines of the posts. In swinging the uppermost frame upwardly, it will easily lower down towards the lowermost frame due to its own weight as a result of the elastic deformation capacity. The invention is further specified with an embodiment illustrated in the drawings, in which: Fig. 1 depicts a view of a frame according to the present invention; Fig. 2 depicts an enlarged view of a detail of the upper end of a post of the frame of Fig. 1; Fig. 3 depicts a side view of the detail of Fig. 2; Figs. 4 and 5 depict enlarged views of cross-sections along lines IV-IV, and lines V-V respectively, in which a post, which extends perpendicular to the depicted post, is indicated with dashes in Fig. 4; Fig. 6 depicts an enlarged view of a detail of the lower end of a post of the frame of Fig. 1; and Fig. 7 depicts a cross-section along the line VII-VII of Fig. 6. Fig. 1 illustrates a frame comprising posts 1, which are joined together by a cross beam 2 and a strut 3. Means, not shown in detail, can be present at the cross beam for the joining of rests or other construction elements to the posts. Such elements can also be provided at other locations on the posts, such as for the assemblying of platforms. As indicated in particular in Figs. 2 to 5, the upper end 4 of a post 1 is provided with a bushing 5, of which portion 6 extends beyond the end of the post. This end 6 is provided with a recess 7 open at the top, and with a groove 8, which extends to the lower edge 9 of the bushing 5 but which is delimitated by the upper edge 10 of the post 1. The upper end 11 of the groove 8 lies in between the lower edge 12 of the recess 7 and the upper edge 13 of the bushing 5. As apparent in particular from Figs. 1, 6 and 7, the lower edge of a post 1 is provided with a pin 14, with a square cross-section and with a bevelled end portion 15. The pin 14 can be formed of a tubing member, and it is fixed in the post by means of the weldings 16. Of course, another method of joining the pin to the post can also be used. The inner diameter DB of the bushing 5 is slightly larger than the outer diameter DS of the post 1, as indicated in Fig. 5. Because of this, the width BU of the recess 7 can be slightly larger than the diameter DS of the post 1, while the recess still extends across less than 180°. Furthermore, the width BS of the groove 8 will be slightly larger than the size BV of a side of the square pin 14 -see Fig. 7. During the assemblying of a frame on a frame already standing vertically, the frame to be assembled is inserted in horizontal position, with the pins 14 of both posts 1 being inserted in the grooves 8 via the recesses 7 till the ends of the posts 1 come to rest against the walls of the bushings 5. A post of the frame to be assembled in the described position is indicated with dashes in Figs. 3 and 4. The frame is swung from this position into the vertical position, during which the pins 14 move through the grooves 8, so that the frame is guided during the swing. When the frame is almost in the vertical position, then the posts 1 will fit into the bushings 5. Then the frame will lower due to its own weight, and the pins 14 will be received in the underlying posts 1. To prevent the posts from being pulled out of the underlying posts, a bore 17, and a bore 18 respectively, can be provided in the upper ends 4 of each of the posts 1 and in the pins 14, in which a locking pin, not specified further, can be inserted. It will be apparent that only a possible embodiment of a device according to the invention has been depicted in the drawings and specified above, and that modifications can be brought about without departing from the invention as described by the appended claims.

Claims: A scaffolding construction, with means which allow two or more posts thereof to be joined together in a vertical position, wherein a post (1) at the one end (4), which end forms the upper end of the post in the assembled construction, is provided with a bushing (5), of which the inner diameter (DB) is larger than the outer diameter (DS) of the post (1) and of which a portion (6) protudes beyond the end (10) of the post, which protuding end is provided with a recess (7), open at the top, which extends across part of the circumference of the bushing (5), characterized in that a groove (8) is provided in the wall portion of the bushing opposite to the recess (7), such that the groove (8), as viewed in the longitudinal direction of the post, is staggered relative to the recess (7) and the outermost end (11) lies in between the ends of the recess (7) lying opposite, while the lower end of the post (1) is provided with a pin (14) which can be received fittingly in the groove (8) and in a portion of the upper end of the post (1), in which the groove (8) in the bushing (5) moves so far towards the end (10) of the post (1) that the pin (14) brought into the groove - of a post (1), in horizontal position, which is supported by the recess (7) - is guided by the vertical walls of the groove (8) during part of the angular rotation made by the post (1) when it is swung into the vertical position, while a portion of the post is supported by the lower edge (12) of the recess (7). A scaffolding construction according to Claim 1, characterized b y the pin (14), joined to the end of a post (1), having a square cross-section. A scaffolding construction according to Claim 1 or 2, characterized by the inner diameter (DB) of the bushing (5) being larger than the outer diameter of the post (1), and that the recess (7) extends across less than half the circumference and the width (BU) of the recess (7) being sufficient for letting the post (1) pass. A scaffolding construction according to any of the preceding Claims, characterized by the groove (8) extending till the other end (9) of the bushing (5), and that the lower edge of the bushing (5) is welded to the post (1) or is fixed to it in any other way. A scaffolding construction according to any of the preceding Claims, characterized by the use of a locking pin, which can be inserted in bores (17, 18), which lie in line, in the pin (14) joined to a post (1) and the portion of the post (1) in which the pin (14) can be received. A scaffolding construction according to any of the preceding Claims, characterized by two parallel and spaced posts (1) being joined together by at least one cross beam (2) lying across the posts, such that a substantially H-shaped frame is obtained.

Inventors: VAN HELMOND JOHANNES HUBERTUS, VAN HELMOND, JOHANNES, HUBERTUS, MARIA
Applicants: SGB HOLDINGS LTD FOR THESE RES, SGB HOLDINGS LTD.FOR THESE RESEARCH & DEVELOPMENT DEPT. HOLLAND
Application year: 1993
Main classification: E04G1
IPC codes: E04G7