COLLAPSIBLE STRUCTURE

Abstract: A collapsible structure is provided comprising pairs of parallel posts (1-8) interconnected by pairs of expansion links-like connecting rods (9-16). Connecting rods of each pair have their centres pivotably connected, whereas their outer ends are pivotably connected with the corresponding posts and wherein at least one outer end of each rod is slideable along the corresponding post. The pairs of parallel posts can be superimposed while corres­ ponding posts are at their meeting ends hingedly connected for an accordian-like collapsability in the vertical plane. Further pairs of parallel posts can be laterally positioned while adjoining posts of adjoining pairs of posts are hingedly connected for a substantial change in the angle enclosed by the planes extending through said pairs of posts.

Description: The invention relates to a collapsible structure that is movable between a fold-out and a fold-up position as defined in the preamble of claim 1. Structures of this kind can be used in its fold-out position for carrying panels, such as photo panels or the like. Collapsible structures are known in numerous embodiments and mostly comprise rather complicated rod-assemblies. These known collapsible structures often have the disadvantage of being less versatile. From FR-E-12.417 a structure according to the preamble of claim 1 is known, of which all the post always are positioned in the same plane. It is an object of the invention to provide a collapsible structure of this type being more versatile. According to the invention a collapsible structure is provided as defined in the characterizing portion of claim 1. Firstly, the application of parallel posts and connecting rods extending between said posts for forming a kind of expansion link, enables the structure, in a way known per se, to take in several different positions in the fold-out position. Further, however, variation of the number of first pairs of posts positioned one on top of the other offers an easy variation of the total height of the structure, while, due to the zigzag- like collapsability of the superimposed pairs of posts, in the fold-up position of the structure a small handy package is obtained. Variation of the angle enclosed by the planes extending through said adjoining second pairs of posts enables an easy variation of the shape of the fold-out structure. The structure can be positioned such that its base can form several different geometric shapes, such as triangles, squares, polygons or sections thereof. It is noted that GB-A-1.542.244 shows already the variation of the angle enclosed by adjoining planes; however, this known structure is not collapsible. According to a handy embodiment of the collapsible structure according to the invention each hinge means comprises a vertical and a horizontal hinge-axis, both said axes extending substantially parallel to the plane of the corresponding pair of posts, the horizontal hinge-axis of a post being connected with the horizontal hinge-axis of the corresponding hinge means of a post positioned thereabove or therebelow through a first hinge lip, the vertical hinge-axis of a post being connected with the vertical hinge-axis of the corresponding hinge means of an adjoining post of an adjacent pair of posts through a second hinge lip. As a result the collapsability of the posts, that in the fold-out position of the structure are aligned, as well as the free setting of posts of adjacent pairs of posts positioned beside each other is obtained in an easy way. Hereby the hinge lips connecting the vertical hinge-axes of adjoining hinge means do not obstruct the hinge motion of the hinge lips connecting the horizontal hinge-axes of adjoining hinge means and vice versa. Further it is advantageous when said posts are provided with a hollow open profile having an open side, the open sides of the posts of each pair of posts being directed towards each other, whereas the posts and the corresponding connecting rods are connected at connecting points that are positioned entirely within said open profiles of each post. Due to this in the fold-up position of the structure or if only part of the structure is fold-up the connecting rods are not visible so that the collapsible structure has an esthetic appearance. If finally both outer ends of each connecting rod are slidable along the corrresponding post, which post further comprises two abutment means for defining the relative position of the connecting rods in the fold-out position of the structure, the structure can obtain in its fold-out position an extremely stable position. Hereafter the invention will be explained further by means of the drawing, in which is illustrated an embodiment of the collapsible structure according to the invention. Fig. 1 shows an elevational front view of a section of a structure according to the invention in its fold-out position; Fig. 2 shows an elevational front view of the structure according to fig. 1 in a partially fold-up position; Fig. 3 shows a cross section according to III-III in fig. 1, illustrated on a larger scale; Fig. 4 and 5 show a detail of the structure according to the invention during the collapsing motion of a structure according to the invention, and Fig. 6 and 7 show a part of the collapsing motion according to fig. 4 and 5. The collapsible structure visible in fig. 1 that is positioned in its fold-out position, comprises a large number of pairs of parallel posts 1, 2; 3, 4; 5, 6; 7, 8, and pairs of connecting rods 9, 10 and 11, 12 and 13, 14 and 15, 16, respectively, connecting the pairs of posts 1, 2; 3, 4; 5, 6; 7, 8 in the way of expansion links. The number of parallel posts and the number of connecting rods depend on the overall dimensions of the structure, and can be chosen freely. The connecting rods, such as the connecting rods 9 and 10, have centres that are mutually pivotably connected by pivots 17. These pivots 17 can have different shapes, for example such, that the connecting rods are detachable in a certain relative angular position. The outer ends of the connecting rods 9-16 are pivotably connected with the posts of the corresponding pair of posts 1-8. In the illustrated embodiment according to fig. 1 the outer ends of the connecting rods 9-16 are pivotably connected with sliding blocks 18, as illustrated at the pair of connecting rods 9, 10, said sliding blocks 18 being slidable along guidings in the posts. These guiding will be illustrated further with reference to fig. 3. For obtaining a collapsability of the structure shown it is necessary, that at least one outer end of each connecting rod 9-16 is slidable along the corresponding post 1-8, this in contrary to the embodiment shown, in which both outer ends of each connecting rod 9-16 are slidable along the corresponding posts 1-8. For defining the position of the connecting rods 9-16 in the fold-out position of the structure each post 1-8 comprises abutment means 19 that, in fig. 1, are only shown schematically. During collapsing the structure from the fold-out position shown in fig. 1 towards the partially fold-up position shown in fig. 2 the outer ends of the connecting rods 9-16 together with their sliding blocks 18 slide apart in opposite direction along the posts 1-8, until the position is reached shown in fig. 2. As will appear from fig. 3 the posts 1-8 are provided with a hollow open profile wherein the open sides of the posts 1-8 of each pair of posts 1, 2; 3, 4; 5, 6; 7, 8 are directed towards each other, whereas the connecting points between the sliding blocks 18 positioned in said posts 1-8 and the connecting rods 9-16 are positioned entirely within said open profiles of each post. Due to this it is possible that the connecting rods 9-16 are no more visible in the position shown in fig. 2, and that the posts of one pair abut. This offers a compact fold-up position. As appears from fig. 1 the structure comprises in its fold-out position a number of pairs of posts that are positioned beside each other, such as the pairs 1, 2 and 3, 4 or the pairs 5, 6 and 7, 8. Always a first post of a first pair of posts is hingeably connected with the adjoining second post of an adjacent second pair of posts. For example post 2 is hingeably connected with post 3, whereas post 6 is hingeably connected with post 7. For obtaining the mentioned hingeable connection the posts 1-8 comprise at their outer ends hinge means 20. The hinge means 20 of adjoining posts 2 and 3 or 6 and 7 are mutually connected through a horizontal hinge lip. Each horizontal hinge lip 21 can pivot with each of its outer ends around vertical hinge-axis of each of the hinge means 20 and is mounted in these hinge means 20. In fig. 3 these vertical hinge-axis 22 and the hinge lip 21 connecting these hinge-axes 22 are shown clearly. Further adjoining posts 2 and 3 or 6 and 7 comprise co-operating toothings 23, so that only a rolling mutual motion of both posts 2 and 3 or 6 and 7 will be possible relative to each other. In this way it is possible, that the angle enclosed by the planes extending through adjoining pairs of posts, such as the pairs 1, 2 and 3, 4 or 5, 6 and 7, 8, can be set freely in the fold-out position of the structure. It is emphasized, that the toothing 23 in the structure according to fig. 1 is positioned on the hinge means 20. But it is also possible that this toothing is provided in the posts themselves. In fig. 3 the mutual co-operation between the toothings 23 on the adjoining hinge means is illustrated clearly. During carrying out a rolling mutual motion of the hinge means or the posts connected thereto a rotation around these vertical hinge-axis 22 occurs, so that the enclosed angle is changed. Further fig. 3 shows a sliding block 18 being guided by guiding 24. In the sliding block 18 a connecting rod 25 is pivotably mounted with its one outer end. Also it is clearly visible that the posts comprise a hollow open profile for fully housing the connecting rods in the fold-up position of the structure. As appears from fig. 1 the illustrated structure further comprises pairs of posts that, in the fold-out position of the structure are positioned one on top of the other, such as the pairs 1, 2 and 5, 6 or 3, 4 and 7, 8, of which the separate posts are aligned. The adjoining outer ends of the posts, here the hinge means 20, are hingeably connected such that the pairs of posts are zigzag-like collapsable towards a position, in which the posts connected with their outer ends extend parallel to and at a short distance from each other. This is illustrated schematically in fig. 4 and 5 that show three posts 26, 27 and 28. Post 26 comprises a horizontal hinge-axis 29, whereas post 27 comprises horizontal hinge-axis 30 and 31 and post 28 finally comprises a horizontal hinge-axis 32. The hinge-axes 29 and 30 of the posts 26 and 27, respectively, are positioned opposite to each other and are connected through a vertical hinge lip 33. Corresponding the horizontal hinge-axis 31 and 32 of the posts 27 and 28, respectively, are mutually connected through a vertical hinge lip 34. (It is emphasized that the hinge lips 33 and 34 are in fact not mounted in the posts 26-28, but in the hinge means, that are positioned at the outer ends of these posts. For the described collapsing motion this does not made any difference.) The hinge-axes 29, 30 and 31, 32, respectively, are disposed laterally relative to the center line of the corresponding posts 26-28, enabling the collaps of these posts. By disposing these pairs of hinge-axis alternatively to the one and to the other side the posts 26-28 can be collapsed zigzag-like as shown in fig. 5. Fig. 6 and fig. 7 show two posts 35, 36, that at their adjoining outer ends are provided with hinge means 37, 38. Between the horizontal hinge-axes 41, 42 of both hinge means 37, 38 a hinge lip 39 is provided enabling a motion of post 35 relative to post 36 as illustrated by the dotted arrow. Finally the fold-out position of the structure illustrated in fig. 7 will be reached. As appears clearly from fig. 6 and 7 the hinge lip 39 has a shape such that it acts also as centring means for the posts 35, 36 (or the hinge means 37, 38). Due to the corresponding recesses in the hinge lip 39 and the projections of the hinge means 37, 38 the position shown in fig. 7 is maintained very effectively. The collapsable structure according to the invention can be fold out and fold up in a very easy way, on the one hand offering a structure in its fold-out position that is very versatile, because the pairs of posts can be pivoted relative to each other through the horizontal hinge lips, on the outer hand obtaining a structure that in its fold-up position is very small and handy.

Claims: Collapsible structure that is movable between a fold-out and a fold-up position, comprising pairs of parallel posts (1, 2; 3, 4; 5, 6; 7, 8) and pairs of connecting rods (9, 10; 11, 12; 13, 14; 15, 16) connecting said posts in the way of expansion links, said connecting rods of each pair of connecting rods having centres (17) that are mutually pivotably connected, said connecting rods further comprising outer ends that are pivotably connected with posts of a corresponding pair of posts, whereas at least one outer end of each connecting rod further being slidable along the corresponding post, characterized by first pairs of posts (1, 2 and 5, 6; 3, 4 and 7, 8) that, in the fold-out position of the structure, are positioned one on top of the other, wherein the separate posts (1, 5; 2, 6; 3, 7; 4, 8) are mutually aligned, whereas the adjoining outer ends of the posts are hingeably connected such, that said pairs of posts are zigzag-like collapsible towards a position in which the end-wise connected posts extend parallel to and at a short distance from each other, and second pairs of posts (1, 2 and 3, 4; 5, 6 and 7, 8) that, in the fold-out position of the structure, are positioned beside each other, wherein a first post (2, 6) of a second pair of posts is hingeably connected with an adjoining second post (3, 7) of an adjacent second pair of posts in such a way that, in the fold-out position of the structure, the angle enclosed by the planes extending through said adjoining pairs of posts can be set freely, and wherein each post (1-8; 26-28; 35, 36) comprises at its outer ends hinge means (20; 37, 38) enabling the collaps of the posts aligned in the fold-out position of the structure as well as the relative setting of the posts positioned beside each other. Collapsible structure according to claim 1, characterized in that each hinge means (20; 37, 38) comprises a vertical (22) and a horizontal (29, 30; 31, 32; 41, 42) hinge-axis, both said axes extending substantially parallel to the plane of the corresponding pair of posts, the horizontal hinge-axis of a post being connected with the horizontal hinge-axis of the corresponding hinge means of a post positioned thereabove or therebelow through a first hinge lip (33; 34; 39), the vertical hinge-axis of a post being connected with the vertical hinge-axis of the corresponding hinge means of an adjoining post of an adjacent pair of posts through a second hinge lip (21). Collapsible structure according to claim 2, characterized in that said first hinge lips (33; 34; 39) extending between the horizontal hinge-axes act also as centring means for the posts. Collapsible structure according to one of the preceding claims, characterized in that the adjoining posts (2, 3; 6, 7) of adjacent second pairs of posts comprise collaborating toothings (23), said toothings permitting only a rolling mutual motion of the adjoining posts relative to each other. Collapsible structure according to claim 4, characterized in that the toothings (23) are provided on said hinge means (20; 37, 38). Collapsible structure according to one of the claims 1 - 5, characterized in that said posts are provided with a hollow open profile having an open side, the open sides of the posts of each pair of posts (1, 2; 3, 4; 5, 6; 7, 8) being directed towards each other, whereas the posts and the corresponding connecting rods are connected at connecting points (18) that are positioned entirely within said open profiles of each post. Collapsible structure according to one of the claims 1 - 6, characterized in that both outer ends of each connecting rod (9-16) are slidable along the corresponding post, which post further comprises two abutment means (19) for defining the relative position of the connecting rods in the fold-out position of the structure.

Inventors: TRUYENS, HENDRIKUS MICHAEL THIMOTHEUS
Applicants: TRUYENS, HENDRIKUS MICHAEL THIMOTHEUS
Application year: 1988
Main classification: A47F5
IPC codes: A47B43, A47F5, F16S3