WO2009092615A1

WO2009092615A1 - Support construction for planar material which can be stretched out as a hollow body in particular

Info

Publication number: WO2009092615A1
Application number: PCT/EP2009/000483
Authority: WO
Inventors: Yücel Atiker
Original assignee: Atiker Yuecel
Priority date: 2008-01-26
Filing date: 2009-01-26
Publication date: 2009-07-30
Also published as: EP2090723A1; EP2240658A1; EP2083134A1; EP2090723B1

Abstract

In a support construction having elastic rods (1a, 4a) as the clamping means, which can be locked and unlocked, and which are capable of stretching out planar material, rod extensions (42, 43) are attached at the ends of the rods (1a, 4a), which are linked to at least one central holding element (36) in an annular arrangement to one another spaced apart so they can be pivoted about a transverse axis. The rod extensions (42, 43) can be jointly locked on the holding element (36) by height setting such that they cannot be pivoted about the transverse axes in a pivot direction.

Description

Carrying construction for in particular as a hollow body aufspannbares flat material

description

The invention relates to a support structure for in particular as a hollow body aufspannbares sheet material according to the preamble of claim 1.

Such hollow bodies, which comprise stretched, flat material, are preferably lampshades, dome tents, greenhouses or similar spatial objects. However, the applicability of the support structure according to the invention is not limited to the aforementioned objects.

A known support structure of a portable lamp essentially comprises a rod-shaped holder and a lampshade (EP 1 059 483 B1). The lampshade is clamped by means of tensioning means in the form of elastic rods such as spring steel wire, spring band steel, fiberglass or carbon rods, which can also be applied in the present application subject, in its shape. The clamping means are pivotally articulated on the one hand at the bottom of the holder, namely on a light socket, and on the other hand on a holding element above the holder. The holder has at least above the light socket

BESTATIGUNGSKOPIE a square bar, which passes through the approximately annular support member and is arranged at this height adjustable. For height adjustability, a locking bolt lock or a set screw can be used. In both cases, the possibility is given to fix the holding element on the upper holding element or the square bar in different positions. A disadvantage of this support structure in particular that the HaI- insurance must be connected to the upper square rod rods via a solid unit, so that the upper support member and hinged in this ends of the elastic rods can be fixed. However, this design of the holder is disturbing in many applications, because it casts shadows, for example in a lamp or limited in other conceivable applications, the free interior of the hollow body formed with this support structure. Outstanding parts of the square rod limit in the clamped state of the support structure their application, can even cause accidents and disturb the aesthetic impression.

On the other hand, another belonging to the prior art support structure for dome tents with arcuately stretched rods whose lower ends are arranged in holding openings of a running on the ground, stretched by the rods to a polygon Gurtrings and their upper ends in a vertex of the dome in radially inwardly extending openings of a rod connecting element are inserted, a free space on (DE 103 46 948 B4). However, this support structure comprises the bottom tensioned belt ring which receives the lower ends of the tensioned rods to form the domed dome. Furthermore, to dismantle and transport the dome tent, the bars must be individually pulled out of the belt ring and the rod connecting element, which is cumbersome and time consuming. Another belonging to the prior art support structure of a collapsible lampshade is a tensioning system like an umbrella frame, which has resilient tension wires as elastic rods and spreader bars, which are hinged to the tension wires (DE-A-7O 09 309, FR-A-2 093 419). The tension wires and the spreader bars are further articulated to a respective slide, which is displaceable on a central tube. In particular, two groups of spreader bars can be provided for spreading a set of tensioning wires so that two spreader bars each act on each tensioning wire. This support structure limits the free interior of the lampshade to a large extent, since not only the central tube is guided through this interior, but also extend the spreader bars.

In a known support structure of the type mentioned (EP 0 563 464 A) is as a holding element of a tent a connecting body with offset by angularly arranged slots known, each having upwardly open recesses in which transverse axes of rod extensions can be stored. On back sides of the rod extensions, which are shaped inclined, inclined portions of the slots may rest in the connecting body. In the rod extensions tent poles are inserted. After the tent poles are mounted and the rod extensions are inserted in the slots, a mounting plate, which is a blocking element, is secured to the connector body by means of a bolt, whereby the rod extensions can not be removed from the slots. A gradual, continuous tensioning of the tent poles or a change in shape of the tent frame by the mounting plate or the locking element is not provided and would not be possible because the locking element is applied to the transverse axes of the rod extensions or adjacent to this closest. - A -

The present invention has for its object to provide a support structure for in particular as a hollow body aufspannbares sheet material of the type mentioned, in which the interior of the hollow body is not limited by a central support and / or spreader bars or the like. The support structure should be feasible with uncomplicated means, be easy to use and be able to make the hollow body variable, in particular with regard to its height / width ratio. With the support structure, the clamping forces that are exerted on the rods to be targeted and simply adjusted uniformly to be bent accordingly to the desired shape.

This object is achieved for the support structure of the aforementioned type with the features of claim 1.

Assuming that the rod extensions on the at least one central holding element, to which they are pivotally hinged about a respective transverse axis, are jointly locked so that they are not in the locked state, at least in a pivoting direction about the transverse axes, the holding element does not need its turn to be locked to a stationary element to set the rod extensions and keep the elastic rods stretched. The pivoting direction, in which the rod extensions can be locked at any rate, is the direction in which the tensioned rods push the rod extensions. It can therefore the rod extensions and with them the rods that are inserted into it, are locked together by the holding element and not only by a connection of the holding member with a stationary element of the support structure. Consequently, no rod-shaped support needs to be provided. Rather, the interior of the support structure of a ner rod-shaped or other holder are kept free. The holding element according to the invention, on which the rod extensions are pivotally hinged and lockable, can be supplemented for clamping an approximately spherical or balloon-shaped hollow body with a second holding element, which is arranged coaxially to the first holding member and hinged to the rod extensions are also pivotable and lockable. On the other hand, in other applications, such as a dome tent may be sufficient only a central upper support member to which the substantially lying in a plane ends of the rods are pivotally articulated by means of the associated rod extensions and can be locked, so that the rod extensions not in any case in a pivoting direction the transverse axes can be swiveled. In this case, a foot according to claim 20 may be mounted non-rotatably on each of a lower end of one of the rods, on which the support structure of the tent can be supported. Such a dome tent can be stretched flat by joint release of the rods on the support member and stacked space-saving in this compact form, transported and stored.

Characterized in that according to the invention in the central support member, in particular a support plate, as a locking element a locking disc or a locking plate each with a support surface on which the rod extensions are supported height adjustable, the necessary clamping forces to achieve a desired shape of the clamped sheet material evenly be set exactly.

The Höheneinsteilbarkeit is realized according to claim 2, characterized in that the locking disc or the locking plate at least over a portion of their Höheneinsteilstrecke by at least one self-locking thread on Order is stepless and lockable height adjustable. This stepless height adjustment and locking, ie self-locking, as achieved by a self-locking thread assembly with interlocking threads suitable pitch, if desired, simply the clamping process can be interrupted, for example, to assess the scored form of the clamped material, and continue starting from this form until the desired shape is achieved. The applied actuating forces for clamping can be relatively low.

In accordance with claim 3, the holding element for central locking or for central release of the rod extensions is made compact in that in the holding element, a flat locking element is arranged centrally inside and that the rod extensions are mounted in the holding element in a radially outer region and radially inwardly towards protrude the locking element, where they rest in the locked state on a support surface on a lower side or an upper side of the locking element. Thus, all rod extensions or rods can be easily solved together by the blocking element is brought into a corresponding position.

Advantageous embodiments of the support structure according to the invention are specified in the subclaims.

For compact design of the retaining element is further provided according to claim 4, that the holding element is designed as a support disc. For this purpose, a locking disc with the support surface on which the rod extensions are supported, rotatably mounted according to claim 5 in the mounting disc as a blocking element. The rotatable bearing can have the following functions: If, according to claim 6, the support disc has inclined bottom portions below inner portions of the rod extensions and the support surface is chamfered conically on the underside of the locking disc and the locking disc is adjustable in height by turning, for example, according to claim 2 in a thread of the support disc, the elastic rods in the locked position, in which the support surface is lowered on the underside of the locking disc to the inclined bottom portions including the rod extensions, are locked. In contrast, if the support surface on the underside of the locking disc is removed by turning the locking disc in the thread of the inclined bottom portions of the support disc, the rod extensions are solved.

The locking disc can be operated simply from above or below by means of at least one hand adjuster, which protrudes from the retaining disc on the locking disc, according to claim 7, i. to be turned around.

The mounting plate can be uncomplicated and robust a substantially solid plate according to claim 8, which is radially slotted for receiving the rod extensions. In this case, further form elements of the holding element can be easily formed from the mounting plate or plate, in particular according to claim 9, a central threaded hole, in which the locking disc is height adjustable.

A compact mounting disc in which the rod extensions are hinged near a peripheral wall, but can also be rotatably mounted for locking and releasing the rod extensions according to claim 10 at the upper portion of the support disc, a locking plate having radial cuts, such that the Rod extensions in a ner open rotational position of the locking plate pass through the incisions and abut in a blocking rotational position of the locking plate at this.

Particularly advantageously comprises according to claim 1 1, the holding element an annular support disc in which the rod extensions are hinged and in the more centrally inside an inner disc height adjustable is arranged so that it can be partially unscrewed down from the annular support disc. In this case, the locking plate, which may be formed as indicated above, rotatably supported in an upper portion of the inner pane. The Höheneinsteilbarkeit the inner pane can be easily realized with an external thread, which engages in an internal thread in the annular support disc. This makes it possible to achieve a particularly large adjustment range of the rod extensions at the ends of the elastic rods.

To simplify operation, in particular for joint rapid release of the rod extensions, the locking plate of the support member of the support structure according to claim 12 is biased by a spring with respect to the inner pane. The lock plate can be locked by applying the rod extensions to her, which is done by the prestressed elastic rods. The locking can be solved by manual axial displacement of the support disk or the inner disk, so that the rod extensions no longer rest against the locking plate. As a result, the locking plate can be automatically rotated by the tensioned spring in the open position.

The spring can be pretensioned according to claim 13 by at least one gripping element, that is, turned into the blocking position, wherein the gripping Element is preferably arranged according to claim 14 eccentrically on the locking plate.

However, the grip element or a manual adjuster can also be arranged in a manner that is easily accessible centrally on the side of the holding element facing away from the blocking plate, in particular below the holding plate or inner pane, and acting essentially the same as the above first actuating element.

In a compact, protected embodiment according to claim 22, the spring loading the blocking plate may be a torsion spring which is arranged in a central hub in the holding plate and, on the one hand, communicates with the hub and, on the other hand, with the blocking plate via a connecting element.

Alternatively, it may be appropriate that the spring according to claim 23 is a arranged in a decentralized or eccentric recess in the mounting plate steel spring which engages on the one hand on the mounting plate and on the other hand optionally via a connecting element on the locking plate.

In the latter configuration, a passage according to claim 24 may be provided in the mounting disc or in the central hub in the mounting disc, which can in particular accommodate a cable gland of a lamp provided with the support structure. In other applications, for example, another fastener can be used in the passage. To give the hollow body with the support structure the desired shape, with a compact flat mounting disc, the rod extensions preferably according to claim 16, two mutually angled legs, of which a first of the leg is connected to a rod end of the elastic rods and a second of the two legs in the holding element or the mounting plate can be fixed, or is releasable. The first leg with the connected rod end protrudes from the holding element, or the mounting plate out. The second leg, which can be fixed or released, can protrude in a released state from the holding element or the holding plate and in particular from the radial portions of the locking plate, which is as described above part of the holding element.

Advantageously, according to claim 17, the rod extensions have a curved contact piece which is suitable for supporting a bent or tensioned rod end in order to avoid its bending at the rod extension.

For a stable support structure, an end portion of one of the rods in one of the rod extensions according to claim 18 is mounted non-rotatably in each case.

For this purpose, the end portions of the rods expedient according to claim 19 square cross sections.

In the application of the support structure for a downwardly open hollow body, in particular a dome tent, according to claim 20 each have a lower rod end of the rods attached to a foot non-rotatably. If, according to claim 21, a stop is arranged in the pivoting area of the bar extensions on the holding plate for each bar extension, the relatively relaxed end position of the bars is defined and by the remaining tension in the bars, the supporting structure can remain a coherent unit.

In a hollow body of clamped sheet material of a support structure according to claim 25, thus having a spacer of resilient material between an upper or a lower portion of the support structure and an adjacent portion of the sheet material, it is achieved that the clamping of the support structure is reinforced, which can support an aesthetic design of the clamped material.

With the arrangement of the manual adjuster, which is connected via a shaft with the locking disc, a greater height adjustability of the locking disc is achieved, which can be moved deeper into the retaining element due to the shaft. In particular, the locking disc is fixed to the shaft with the manual adjuster according to claim 27, and thus rotatably connected, whereby a deeper screwing the locking disc is achieved in a thread of the holding element.

Instead of the locking disc, the shaft can be fixedly connected to a driving disc according to claim 28 in order primarily to increase the driving disc, in particular by a thread formed on the driving disc instead of on the locking disc or by a thread formed in the shaft the driving plate outside, ie on the opposite side to the shaft, in conjunction stands. Thus, the height adjustment of the locking disc can be done by thrust. If the locking disc according to claim 29 mounted externally on the driving plate, it is rotatable together with the driving plate and thereby adjustable in height due to a threaded arrangement.

In particular, in the latter case, the locking disc is advantageously a low-friction metal disc according to claim 30, while the manual adjuster, the shaft and the driving plate can be made of plastic production favorable.

Particularly little wear of the locking disc and easy operation of the locking disc are achieved according to claim 31, characterized in that the locking disc is connected via a ball bearing with the driving plate slidably, but not rotatably connected. In this case, therefore, the driving plate is primarily adjusted by turning by means of a threaded arrangement, wherein primary height adjustment is transmitted via the thread on the locking disc.

If necessary, for example when using the support structure in a lamp, a cable feedthrough can be provided centrally through the locking disk, possibly the metal disk, the shaft and the manual adjuster according to claim 32.

An essential part of the central holding element, which has a function for height adjustment of the locking disc is a central cylindrical hub with a cylinder wall, which has an internal thread according to claim 33. In this case, according to claim 34, the locking disc has an external thread which is inserted into the internal thread of the central cylindrical hub. attacks. As mentioned above, instead of the locking disc, the optionally present driving disc may have an external thread according to claim 35, which engages in the internal thread of the cylindrical hub.

In an alternative to the hub having an internal thread, the central support member according to claim 36 comprises a central cylindrical hub having on at least one side a cover plate with a central cover plate hole, and with respect to the cover plate has a bottom plate, wherein the shaft, which is a connecting element between represents the manual adjuster and the locking disc or driving plate, extends through the cover plate hole and is provided with an external threaded portion. In this case, in an alternative according to claim 37, the cover plate hole may be formed as the internal thread of the central hub, in which engages the externally threaded portion which is arranged corresponding to the shaft accordingly. In another alternative according to claim 38, the bottom plate has a bottom threaded hole in which engages the male threaded portion of the shaft, which is arranged on a lower portion of the shaft. The lower portion of the shaft extends, seen from the manual adjuster, beyond the locking disc down.

It should be noted at this point that the terms above and below are interchangeable in connection with the holding element, because the holding element from the primarily described position, in which, for example, the manual adjuster is above the holding element, and vice versa, quasi upside down, can be arranged, for example, together with a normally arranged holding element can form a support structure. In forming the bottom plate according to claim 39, the inner portions of the rod extensions can be fixed in adjustable height between the bottom and the locking plate.

Preferably, according to claim 40, the inner end portions of rod extensions, wherein the end portions can also be referred to as legs of the rod extensions, formed and supported so that they are supported on the bottom plate of the hub when the locking disc and / or the bottom plate höhenverstellt the end portions are. The rod extensions are thus not only fixed in a pivoting direction by the locking disc, but also in the opposite direction of pivoting through the bottom plate.

According to claim 41, the end portions of the rod extensions are suitably rounded to achieve good sliding properties on the optionally rotatable locking disc and in any case a secure fixation between the locking disc and the bottom plate. These advantages are achieved to a greater extent, but greater design effort according to claim 42 by a respective roller is mounted at the end portions of the rod extensions.

In a robust embodiment according to claim 43, radial projections may be arranged on the central, substantially cylindrical hub with respect to a fictitious central axis, which accommodate the transverse axis of the rod extensions about which the rod extensions are pivotable in height adjustment. Further expedient according to claim 44, each projection having two parallel legs, between which inner end portions of the rod extensions are mounted on the transverse axes. Thus, the rod extensions can be safely guided and the Beanspru- Chung the transverse axes, which extend through the two legs each, are kept low.

A particularly stable unit results according to claim 45, in that the abovementioned projections are integrally formed on the central, substantially cylindrical hub.

The rod extensions may be advantageously designed according to claim 46 that they are suitable not only to receive one end of a rod, but at least two. For this purpose, the outer portion of the rod extension according to claim 47 is expediently widened relative to the inner portion of the rod extension, wherein the widened outer portion may be suitably formed curved around the above-mentioned fictitious central axis of the hub.

The invention is explained below with reference to a drawing, in the figures embodiments are shown, from which further details may result. Show it:

1 shows a first embodiment of the holding element in a plan view,

FIG. 2 shows the first embodiment according to FIG. 1 in a longitudinal section in the sectional plane A-A,

Figure 3 shows a second embodiment of the retaining element in a

Longitudinal section corresponding to FIG. 2,

FIG. 3 a shows a first variant of the second embodiment in a top view in the locked state,

3b shows the first variant according to Figure 3a in plan view, but in a relaxed state, 3c shows a second variant of the second embodiment in a plan view in the locked state,

FIG. 3d shows the second variant according to FIG. 3c in a top view, but in a relaxed state,

FIG. 4 shows a third embodiment of the holding element in a longitudinal section corresponding to FIGS. 2 and 3 in the locked state of bars or bar extensions,

FIG. 5 shows the third embodiment according to FIG. 4, but in the relaxed state of the rod extensions or rods, likewise in a longitudinal section,

Figure 6 shows the third embodiment of the retaining element in relaxed

State of the rod extensions or rods, corresponding to FIG. 5, but with a lowered inner disk,

7 shows a first embodiment of an end section of one of the rods in a perspective view,

8 shows a second embodiment of an end portion of one of

Bars in perspective,

FIG. 9 shows an end portion of one of the rods attached to a foot.

FIG. 10 shows an embodiment of a hollow body made of stretched flat material with a carrying construction,

1 1 shows a fourth embodiment of the retaining element in the relaxed state of the rod extensions or rods in a side view, partially cut, with an additional metal disc as a locking disc, which may rest against the end portions of the rod extensions,

FIG. 11 a shows the additional locking disk in a larger perspective view; 12 shows the fourth embodiment of the retaining element in the tensioned state of the rod extensions, corresponding to FIG. 11, but with lowered additional locking disk, FIG.

1 3, the fourth embodiment of the holding element as in Figure 1 1, but with angled rod extensions in a relaxed state,

14 shows the fourth embodiment with the angled limbs of the rod extensions according to FIG. 1 3, but in the clamped state, FIG.

FIG. 15 shows a fifth embodiment of the retaining element, in a relaxed state,

16 shows a sixth embodiment of the retaining element as a variant of the fifth embodiment, in the relaxed state, in each case in a side view, partly in section,

17 shows a seventh embodiment of the retaining element in a relaxed state in a side view, partially in section,

FIG. 18 shows an eighth embodiment of the holding element, which is a variant of the seventh embodiment, partially cut and

19 shows an essential part of a ninth embodiment of the holding element in a view from below.

In Figure 1, the support structure comprises six elastic rods 1 to 6, whose end portions extend radially star-shaped to a holding element 13. The end portions of the rods 1 to 6 are non-rotatably inserted into rod extensions 7 to 12. The rod extensions may each be shorter than shown in the figures and in particular hook-shaped according to the formation of a holding element 13. The rod ends with the rod extensions 7 - 1 2 are summarized in the holding element 13, with which the rods can be stretched in a curved shape and locked in this or can be relaxed, the rods 1 - 6 are straight extended, as shown in FIG 2 shown.

To form a hollow body, in particular a lampshade, two holding elements, which are formed like the holding element 1 3, may be arranged at a vertical distance from each other. The rods 1 to 6 are for this purpose connected to aufspannbarem sheet material, which is not shown in the drawing and can be clamped, for example, to an approximately spherical shape.

But it is also possible, for example, to form a dome tent with only one holding element 13, wherein not shown lower rod ends of the rods 1 to 6 may be provided with one foot as the foot 14 in Figure 9. In particular, in each case a lower rod end 14 is connected to the foot 15 in an unrotatable manner, in order to achieve a high stability of the dome tent.

The retaining element generally designated by 13 in FIGS. 1 and 2 is designed in the form of a retaining disk 16 from a solid plate. The mounting plate has radially star-shaped slots 17 to 22, the bottom portions 29, 30, as shown in Figure 2, each extend obliquely downwards towards the center of the holding disk. In each case one of the slots 17 to 22 receives one of the rod extensions 7 to 12. For the pivotable mounting of the two-legged rod extensions 7 to 12, a transverse axis 23 to 28 is arranged in each of the slots. in the transverse axes 23 to 28 are arranged tangentially to an imaginary circle, which is shown in Figure 1 with a broken line.

Inner sections, e.g. 7a, 10a of the rod extensions 7 to 12 extend into a central threaded hole 31 in the retaining disk 16, which accommodates a locking disk 32 with an unspecified external thread. The locking disc 32 has on its underside a conical support surface 33 which is formed with substantially the same inclination as the bottom sections, for example 29, 30. On its upper side, the locking disc 32 is provided with a manual adjuster 34, with which the locking disc 32 detected and for height adjustment in the threaded hole 31 can be rotated.

In the position of the locking disc 32 shown in Figure 2, the inner portions of the rod extensions 7 to 1 2 are not pivoted by the support surface 33 and are at a clear distance from the inclined bottom portions 29, 30 in a dissolved state. For clamping the rods 1 to 6, the locking disc 32 is screwed into the threaded hole 31, wherein the support surface 33, the inner portions 7a, 10a of the rod extensions 7 - 12 in the direction of the inclined bottom portions 29, 30 pivots and wherein outer legs of the rod extensions 7 to 12 can stretch the elastic rods 1 to 6. The inner sections, e.g. 7a, 10a of the rod extensions 7 to 1 2 are held in a lower end position of the locking disc 32 by the latter, wherein the inner portions 7a, 10a of the rod extensions 7 to 12 on inclined bottom portions, e.g. 29, 30 rest.

By turning the locking disc 32, this locking position of the rod extensions 7 to 12 can be easily solved centrally, bringing the relax elastic bars 1 - 6. The bars 1 - 6 and a sheet material connected to them can be laid flat in a relaxed position, as partially shown in Figure 2, whereby the relaxed support structure, for example, for transport and storage assumes a compact state.

The upper manual adjuster 34 for revealing adjustment of the locking disc 32 in addition, a lower manual adjuster 35, as shown in Figure 3 to a second embodiment, protrude down from the holding element.

The second embodiment of the retaining element 36 shown in FIG. 3 differs in the following from the first embodiment according to FIGS. 1 and 2:

The holding element 36 comprises in Figure 3, a support plate 37, in which the rod extensions. For example, 42, 43 with unspecified transverse axes, which are tangentially arranged along an imaginary circle near an unspecified peripheral wall of the support plate 37, are pivotally articulated. In an inner upper portion of the support disk 37, specifically in a central hub-shaped part 38 of the support disk, a lock plate 39 is rotatably supported. The central hub-shaped part 38 includes a torsion spring 40, which is connected via a connecting element 41 with the locking plate 39 in connection. The lock plate 39 may alternatively be rotated by the handle member 39a on the lock plate 39 or by the lower central hand adjuster 35 to tension the torsion spring 40 '. The rod extensions mounted in the retaining disk 37, of which two of the diametrically opposite rod extensions, which are designated by 42, 43 in FIG. 3, each have two limbs which are angled away from one another, for example 44, 45. The angled legs 44, 45 enclose an obtuse angle and make it possible that, with the rods attached to the rod extensions, for example 42, 43, a hollow body clamped can be more strongly arched than in the case of rectilinear alignment of the two legs. In each case an outer leg 44 of the rod extension 42 projects through an unillustrated slot in the outer peripheral side of the support disc 37 and is externally provided with a curved abutment piece 46 a, on which a rod end can be supported under tension. An inner leg, for example 45, each passes through a slot in an inner wall 47 of the support plate 37 inwardly where it abuts against a support surface 48a of the lock plate 39 when the lock plate is in the locked state. However, after the locking plate 39 is released by depressing the retaining plate 37, because the rod extensions thereof are removed as a result of changing the bending of the elastic rods, for example 1 a, 4 a, and the locking plate 39 is automatically rotated by the torsion spring 40 in its open rotational position, are the inner legs, for example, 45 of the rod extensions, for example, 42, 43 below radial incisions in the locking plate 39 so that they can pass through them upwards outside, with the elastic rods relax.

For a first variant of the second embodiment of the retaining element, the position of the locking plate 39 'in the locked state in Fig. 3a is shown and its position in the released state or in its open rotational position in Fig. 3b. The corresponding positions of the rod extensions of the third embodiment of the holding element are analogous to the locked state the positions 42, 43 in Figure 5 and for the released state at the same positions in Fig. 6 shown.

As can be seen from FIGS. 3 a and 3 b, the first variant of the second embodiment has only four rod extensions 42 ', 43', 67, 68 which are mounted at equidistant circumferential distances and about non-designated transverse axes on the support disk 37 '. The transverse axes are in turn arranged along a circle shown with a broken line 69.

Furthermore, in the first variant of the second embodiment shown in Figures 3a, 3b, the torsion spring 40 'on the one hand to a connecting element 41' and on the other hand to a central hub 38 'of the mounting plate 37' attached.

When tensioning the torsion spring 40 'by means of a gripping element 39a' and tensioning of the elastic rods 1 ', 2', 3 ', 4', the rod extensions 42 ', 67, 43' and 68 of plant pieces corresponding to the abutment pieces 48a, 48b in FIG. 3 and the locking plate 39 'locked in the locked position.

To release the locking plate 39 ', the support plate 37' at the diametrically opposite pressure points 37a, 37b pressed down, whereby the voltage applied to the support disc rod extensions 42 ', 43', 67, 68 are separated from the contact pieces of the locking plate 39 ', which is therefore rotated by the relaxing torsion spring 40 'in the open position shown in Fig. 3b, in which when releasing the support disc 37', the legs of the rod extensions 42 ', 43', 67, 68 by radial cuts 70, 71, 72, 73 of the lock plate 39 ' can pass through and pass when the rods are stretched on the rod extensions 42 ', 43', 67, 68.

The second variant of the second embodiment illustrated in FIGS. 3c and 3d largely corresponds to the first variant of the second embodiment according to FIGS. 3a and 3b and is provided with the same reference numerals so that the above description can be used.

In the second variant, however, a central hub 38 "with a cylindrical, hollow, hatched passage 74 is formed, which is not occupied by a torsion spring or another part of the holding element itself, but for receiving, for example, further fasteners and preferably an electrical cable gland in Therefore, instead of the central torsion spring of the first variant, a steel spring 75 is arranged in a recess 76 of the mounting plate 77 so that it is on the one hand on the mounting plate 77 and on the other hand - optionally via a fixed connection element Thus, the steel spring 75 can cooperate in the same way with the locking plate 39 'as the torsion spring 40 in the first variant of the second embodiment, ie the locking peg shown in Fig. 3c under tension of the steel spring 75 latte 39 'in the released state from the locked position shown in Fig. 3c in the position shown in Fig. 3d rotate, in which leg of the rod extensions 42', 43 ', 67, 68 through the radial cuts 70, 71, 72, 73rd the locking plate 39 'can swing out, whereby the elastic rods on the rod extensions 42', 43 ', 67, 68 are relieved. - 2 A -

The third embodiment of the holding member 49 according to Figures 4 to 6 differs from the second embodiment essentially in that the holding member 49 comprises an annular support disc 50 in which the rod extensions 42, 43 are pivotally articulated about transverse axes 51, 52, wherein a Inner disk 53 is screwed with an external thread 54 in an internal thread 55 of the annular retaining disk. The inner disk 53 receives in its upper portion the locking plate 39, which may be formed as in the second embodiment. As a result, the rod extensions, e.g. 42, 43, as in the second embodiment together with the locking plate 39, in particular the support surfaces 48 a, 48 b, which are arranged at the bottom of the locking plate 39. A torsion spring 56 is arranged in a central hub-shaped part 58 of the inner disk 53, it acts like the torsion spring 40 including the locking in the second embodiment.

Referring to FIGS. 4-6, the torsion spring 56 engaging the lock plate 39 can be tensioned from above by a handle member 39a or from below by a lower actuator 60 by turning the lock plate 39 to the lock rotational position and locking it. wherein the inner non-designated legs of the rod extensions 42, 43 abut from below on the support surfaces 48 a and 48 b.

The locking of the torsion spring 56 can be achieved by pressure on the support plate 37, for example, pressure points analogous to the pressure points 37a, b in Fig. 3a - 3d from above. The torsion spring 56 is previously biased either by the lower actuator 60 or the actuator 39a on top of the locking plate 39, wherein the locking plate 39 enters the blocking rotational position shown in FIG. In Figures 5 and 6 shown positions of the rod extensions 42, 43, the locking plate 39 is in the open rotational position, so that the rod extensions 42, 43 upwards by radial cuts in the locking plate 39 and slots in an outer portion of the inner pane 53 and in the annular support plate 50 can pivot out of the support member 49 upwards, whereby the rods relax with the rod ends, eg 1a and 4a and no longer rest against the abutment pieces 46a, 46b.

As a result of the height adjustability of the inner disk 53 in the annular hollow support plate 50, which is shown in Figure 6, there is a particularly large adjustment of the rods, for example 1 and 4, and thus a further design possibility of the hollow body, with the elastic rods, for example, 1 and 4, can be spanned.

In Figs. 7 and 8 it is shown how end portions 62 and 63, respectively, are preferably disposed in outer portions of bar extensions 64,65 so that the end portions 62,63 can not be twisted in the bar extensions 64,65. For this purpose, the end portion 62 in Figure 7 square cross sections. In round cross sections such as those of the end portion 63 in Figure 8 prevents a transverse pin 66 through the end portion of a rotation.

Also, the lower end of the rod 14 with angular cross-sections of Figure 9 is non-rotatably mounted on the foot 1 5, to serve for stable setting example of a dome tent. In FIG. 10, the shape of a hollow body 79 is determined by a spacer 81 made of resilient material except by a supporting structure generally designated 80, which is realized here as a helical compression spring. As shown in Figure 10, the spring is formed substantially helically. It lies with an upper annular end 82 on the inside at a lower approximately spherical segment-shaped portion 83 of the tensioned support structure 80 and with a lower annular end 84 at a lower, optionally reinforced end of a substantially frusto-conical portion 85 of the clamped sheet material 86, which overall streamlined takes the form of a balloon. Retaining elements of the support structure, which may be formed in principle as the retaining elements described above, are designated 87, 88.

The holding element 89 according to Figure 1 1 has a conical bottom 90, about at least one side portion 91, which may also be spatially symmetrical to a vertical central axis, not shown, and in the transverse axes 92, 93 for supporting straight rod extensions 94, 95 are arranged , Fixedly connected to the at least one side section 91 is a hub 94, which is likewise arranged centrally about the vertical central axis and has an internal thread 95a. In the internal thread engages an external thread 96a of a driving plate, which is in communication with the additional metal disc 97 as a locking disc, so that the additional metal disc as the actual locking disc by turning a manual adjuster 98 which is fixedly connected via a shaft 99 with the driving plate 96. By the manual adjuster 98, the shaft 99, the driving plate 96 and the locking disc 97 extends a cable gland 100th Figure 1 2 shows the holding member 98 in the lowered state of the follower plate 96 and the locking disc 97 which abuts the end portions of the rod extensions 95, by the lowered unit of the locking disc 97, the driving plate 96, the shaft 99 and the manual adjuster 98 against the conical bottom 90 is pressed so that the rod extensions project upwards.

In the fourth embodiment according to FIG. 13 of the retaining element, however, the rod extensions are formed with angled limbs 101, 102 so that the outer limbs 101 protrude vertically downward in the relaxed state of the retaining element and in the tensioned state of the retaining element according to FIG Are kept substantially horizontal, while the inner legs between the locking disc 97 and the conical bottom 90 are clamped.

The fourth embodiment shown in FIGS. 11 to 14 is particularly suitable for trade fair displays.

The illustrated in Figures 15 to 18 fifth to eighth embodiments of the holding elements 103, 104, 105 and 106 are distinguished from the fourth embodiment by lower-friction storage and height adjustment of the unit of the hand adjuster 107, the shaft 108 and a ball bearing 109 on whose lower side facing away from the shaft 108, a locking disc 1 10 is mounted.

At the bottom of the locking disc 1 10 ends of the inner leg or end portions 1 1 1, 1 1 2 push rod extensions. The end 1 13 of the end portion 1 1 1 is rounded and in the end 1 14 of the end portion 1 12 a roller 1 1 5 is mounted. Both measures promote the easy adjustability of the rod extensions on the locking disc 1 10 without much wear. For height adjustment of the locking disc 1 10, the shaft 108 has an external thread 1 1 5, which engages in an internal thread 1 1 6 of a cover plate hole 1 17. The cover plate 1 18 may be part of the cylindrical hub 1 1 9, for example, is open at the bottom and radial projections 1 20, 121, in which transverse axes 122, 123 of the rod extensions 1 24, 125 are arranged.

The holding element 104 differs from the holding element 103 in that the shaft 1 26 has a split thread 1 27, 128, which can engage in the internal thread 1 16 to finely adjust the shaft in its upper and lower end positions, and thus the end portions 1 1 1, 1 12 of the rod extensions.

The holding element 105 in Figure 17 differs from the holding elements 103 and 104 by an adjustable bottom 129 which is height adjustable with an external thread 1 30 in a lower internal thread 1 31 of the hub 132 to a height-variable conditioning of the ends 1 1 3, 1 14 to achieve the rod extensions.

The adjustable bottom 129 in FIG. 17 also shows a central internal thread 133, which is inoperable in the retaining element 105, but has in the retaining element 106 according to FIG. 19 for engagement of a lower external thread 134 on a lower shaft extension 135 of the shaft 136. In the central internal thread 1 33 and the lower external thread 134, the shaft 136 can be finely adjusted and adjusted in the lowered position. An upper threaded portion 1 37 of the shaft 136 is then unscrewed from the internal thread 1 16 of the cover plate hole 1 17. Between the operations of the upper threaded portion 137 and the lower ren outer thread or externally threaded portion 134, the shaft can be easily moved, but not locked or fine tuned.

FIG. 19 shows an essential part of a ninth embodiment of the retaining element in a view from below, which comprises a central, essentially cylindrical hub 138. Radially to a plane perpendicular to the plane of the central axis of the holding element or the hub 138 are formed from these projections 139 - 142. Each of the projections 139-142 each comprises two parallel legs, eg 143, 144 of the projection 139. The two legs, for example 143, 144, each take on a transverse axis, eg 145, in which a rod extension, eg 146, is mounted. In this case, there is a relatively narrow inner portion 147 of the rod extension between the two legs 143, 144, while an outer, wider annular portion 148 laterally beyond the two parallel legs 143, 144 can protrude. The relative to the inner portion 147 relatively wide outer portion 148 has receptacles for four rod ends 149 - 152, which need not be stored individually in individual transverse axes thus. The unit shown in Figure 19 is also particularly robust. The rod extensions, for example, 146, in turn, in its inner portion, eg 147, adjustable by means of the locking plate 153, whereby all rods can be stretched at the same time to the desired extent or relaxed.

_CJlCJL

LIST OF REFERENCE NUMBERS

1 bar 36 holding element r rod 36 'holding element

1 a bar end 36 "holding element

2 rod 37 retaining disc

2 'rod 37' retaining disc

3 bar 37a pressure point

3 'bar 37b pressure point

4 bar 38 central hub (in the

4 'rod retaining washer)

4a bar end 38 'central hub (in the

Rod holding disc)

6 bar 38 "central hub (in the

7 rod extension retaining disc)

7a inner portion 39 locking plate

8 rod extension 39 'locking plate

9 Rod extension 39a Handle element

1 0 Rod extension 39a 'Handle element

10a inner portion 39b grip element

1 1 Rod extension 40 Torsion spring

1 2 Rod extension 40 'torsion spring

1 3 retaining element 41 connecting element

1 4 lower bar end 41 'connecting element

1 5 feet 42 rod extension

1 6 Mounting plate 42 'Rod extension

1 7 slot 43 rod extension

1 8 slot 43 'rod extension

1 9 slot 44 thighs (outer)

20 slit 45 thighs (inner)

21 slot 46a investment piece

22 slot 46b investment piece

23 transverse axis 47 inner wall

24 transverse axis 48a support surface

25 transverse axis 48b support surface

26 transverse axis 49 retaining element

27 transverse axis 50 annular retaining disc

28 transverse axis 51 transverse axis

29 bottom section 52 transverse axis

30 bottom section 53 inner pane

31 threaded hole 54 male thread

32 locking disc 55 internal thread

33 conical support surface 56 torsion spring

34 Manual adjuster 57 Stop

35 manual adjuster 58 central hub-shaped part the inner disk 97 lock washer

Connection element 98 Manual adjuster lower grip element 99 Shaft

Stop 100 cable feedthrough

End portion 101 legs

End portion 102 legs

Rod extension 103 Retaining element

Rod extension 104 retaining element

Cross pin 105 retaining element

Rod extension 106 retaining element

Rod extension 107 Manual adjuster

Line of transverse axes108 Shaft arrangement 109 Ball bearing Radial incision 110 Locking disc Radial incision 111 End portion / leg Radial incision 112 End portion / leg Radial incision 113 End of the end portion 111

Passage 114 end of the end portion 112

Steel spring 115 external thread

Recess 116 internal thread

Retainer washer 117 cover plate hole

Connecting element 118 cover plate

Hollow body 119 hub

Carrying structure 120 radial projection

Spacer 121 radial projection upper end of the 122 transverse axis

Spacer 123 transverse axis lower section of the 124 rod extension

Carrying structure 125 Rod extension Lower end of the 126 shaft

Spacer 127 split thread lower portion of the 128 split thread sheet material 129 adjustable bottom sheet material 130 external thread

Holding element 131 internal thread

Retaining element 132 hub

Retaining element 133 central internal thread

(conical) bottom 134 lower external thread

Side section 135 lower shaft extension

Transverse axis 136 shaft

Transverse axis 137 upper threaded section

Hub 138 hub

Rod extension 139 Projection a Internal thread 140 projection, 9S 'driving plate 141 projection a external thread 142 projection 143 thighs

144 thighs

145 transverse axis

14ö rod extension

147 inner section

148 outer section

149 bar end

150 bar end

151 bar end

152 bar end

153 Speaks.

Claims

claims

1. support structure for in particular as a hollow body aufspannbares sheet material, with elastic rods (1 - 6, 1 '- 4') as lockable and releasable clamping means which are suitable to open in the locked state, the sheet material, and in particular at least partially from the flat Material are enclosed, wherein at substantially lying in a plane ends of the rods (1 - 6, T - 4 ') rod extensions (7 - 12, 42, 42', 43, 43 ', 64, 65, 67, 68) attached are at at least one central holding element (13, 36, 36 ', 36 ", 49) in an annular arrangement spaced from each other about a transverse axis (23 -.28, 51, 52) pivotally articulated and wherein the rod extensions (7 - 12, 42, 42 ', 43, 43', 64, 65, 67, 68) on the at least one holding element (13, 36, 36 ', 36 ", 49) are locked together in such a way that they in the locked state anyway in a pivoting direction are not pivotable about the transverse axes (23 - 28, 51, 52) in that, in the central holding element (13, 36, 36 ', 36 ", 49), in particular a holding disk (16, 50), a blocking disk (32) or a blocking plate (32) 39) in each case with a support surface (33 bzw.48a), at which the rod extensions (7-12) can be supported, is height adjustable.

2. Carrying structure according to claim 1, d ad u rch ge ken nzeich net, that the locking disc (32) or the locking plate (39) at least over a portion of its Höheneinsteilstrecke by at least one self-locking thread assembly is infinitely variable and lockable height adjustable.

3. support structure for in particular as a hollow body aufspannbares sheet material, with elastic rods (1 - 6, 1 '- 4') as lockable and releasable clamping means which are suitable to open in the locked state, the sheet material, and in particular at least partially from the flat Material are enclosed, wherein at substantially lying in a plane ends of the rods (1-6, 1 '- 4') rod extensions (7 - 1 2, 42, 42 ', 43, 43', 64, 65, 67, 68 ), which are pivotably articulated on at least one central holding element (13, 36, 36 ', 36 ", 49) in an annular arrangement spaced about a respective transverse axis (23-28, 51, 52) and wherein the bar extensions ( 7 - 1 2, 42, 42 ', 43, 43', 64, 65, 67, 68) on the at least one holding element (13, 36, 36 ', 36 ", 49) are locked together in such a way that they are locked in State in any case in a pivoting direction about the transverse axes (23 - 28, 51, 52) schwenkb Ar are, in particular according to claim 1 or 2, characterized in that in the at least one holding element (13, 36, 36 ', 36 ", 49), a flat locking element (32, 39, 39') is arranged centrally adjustable in height and that the Rod extensions (7 - 1 2, 42, 42 ', 43, 43', 67, 68) in the holding element (1 3, 36, 36 ', 36 ", 49) are mounted in a radially outer region, radially inwardly towards the locking element (32, 39, 39 ') protrude and rest in the locked state on a support surface on a bottom or an upper side of the locking element (32, 39, 39').

4. support structure according to one of the preceding claims, dad urch in that the holding element (13) is designed as a support plate (16).

5. Carrying structure according to one of claims 1 to 4, d ad urch ge designated net, that in the support disc (16) as a blocking element a locking disc (32) with the support surface (33) on which the rod extensions (7- 12) can be supported , is rotatably mounted and is height adjustable by turning.

Support structure according to claim 4, characterized in that the support disc (16) has inclined bottom portions (29, 30) below inner portions (7a, 10a) of the rod extensions (7-12) and that the support surface (33 ) is tapered on the underside of the locking disc (32).

7. Support structure according to one of claims 4 to 6, d ad urch ge ke n nzeich net that with the locking disc (32) at least one manual adjuster (34) is in communication, which from the support disc (16) via the locking disc (32) protrudes.

8. Carrying structure according to one of claims 5 to 7, d ad u rk k e nzeic net, in that the retaining disc (16, 37, 37 ', 77) is a substantially solid plate, which is radially slotted to receive the rod extensions (7 - 12, 42, 42', 43, 43 ', 67, 68).

9. Carrying structure according to one of claims 5 to 8, d ad u rch g e ken nzeic hn et that the support disc (16) is provided with a central threaded hole (31) in which the locking disc (32) is height adjustable.

10. A support structure according to any one of claims 3 to 8, characterized in that at an upper portion of the support disc (37, 37 ', 77) a locking plate (39) coaxial with a central hub (38) in the Support disc is rotatably mounted and that the locking plate (39, 39 ') has radial cuts (70 - 73), such that the rod extensions (42, 42', 43, 43 ', 67, 68) are suitable, in an open rotational position the blocking plate (39, 39 ') through the incisions (70 - 73) to pass and in a blocking rotational position of the locking plate (39, 39') abut against this.

11. Carrying construction according to one of claims 1-3, characterized in that the retaining element comprises an annular retaining disc (50) that in the annular retaining disc (50) the rod extensions (42, 43) are articulated that in the annular Holding disc (50) an inner disc (53) is arranged vertically adjustable so that it is partially rotatable downwards from the annular support disc (50), and that on a top portion of the inner disc (53) is rotatably mounted a locking plate (39) having radial cuts such that the rod extensions (42, 43) are adapted to pass in an open rotational position of the locking plate (39) through the incisions and in a blocking rotational position of the locking plate (39) abut against this.

12. Carrying structure according to claim 10 or 11, characterized in that the locking plate (39, 39 ') by a spring (40, 56, 75) relative to the support disc (37, 37', 77) and the inner disk (53) is prestressed in such a way that the locking plate (39, 39 ') in the locked position by abutment of the rod extensions (42, 42', 43, 43 ', 67, 68) by means of the elastic rods (1 - 6, 1' - 4 ') is lockable and that the locking plate (39, 39') by manual axial displacement of the support disc (37, 37 ') and the inner disc (53) of the rod extensions (42, 43) is releasable and by the spring (40 , 56, 75) is rotatable in the open position.

13. Support structure according to claim 12, dad u rch ge ned marked et that by at least one gripping element (39 a, 39 a ', 39 b, 60), the spring (40, 56, 70) is prestressed.

14. Carrying structure according to claim 13, d ad u rk ken nzeic hn et, in that the gripping element (39a, 39a ', 39b) is arranged eccentrically on the blocking plate (39, 39'), such that with the gripping element (39a, 39a ', 39b) the blocking plate (39, 39') counteracts the force of the Spring (40, 56, 75) is rotatable in the blocking rotational position.

15. Carrying structure according to claim 13, characterized in that a manual adjuster (35) or the gripping element (60) is arranged centrally on the side of the holding element (36, 49) facing away from the blocking plate (39).

16. Carrying construction according to one of the preceding claims, characterized in that the rod extensions (42, 43, 42 ', 43', 67, 68) each have two mutually angled legs (44, 45), of which in each case a first of the legs (44) with a rod end (1a, 4a) is connected and a second of the two legs (45) in the holding element (13, 36, 36 ', 49) is fixable or is releasable and pivotable ,

17. Carrying construction according to one of the preceding claims, characterized in that the rod extensions (42, 43) each have a curved abutment piece (46a, 46b) which is suitable for a curved rod end (1a, 4a). support.

18. Carrying structure according to one of the preceding claims, d ad u rk nzeich n et, in that in each case one end section (62, 63) of one of the bars (1-6, 1 '- 4') is non-rotatably mounted in one of the bar extensions (64, 65).

19. Carrying structure according to claim 18, characterized in that the end section (62, 63) of one of the bars or the bar end (14) has angular cross-sections.

20. Carrying structure according to one of the preceding claims, ad d e rt h e h e that in each case a lower rod end (14) of the rods on a foot (15) is mounted non-rotatably.

21. Carrying construction according to one of claims 5 to 20, d ad urch ge I mean et n et that in the swivel range of the rod extensions (42, 43) on the support disc (37, 50) each have a stop (57, 61) is arranged ,

22. Carrying construction according to claim 12, characterized in that the spring (40, 56) is a torsion spring, which is arranged in a central hub (38, 38 ') in the retaining disc (37, 37') and on the one hand with the hub (38, 38 ') and on the other hand with the locking plate (39, 39') optionally via a connecting element (41, 41 ', 59') is in communication.

23. Support structure according to claim 12, That is, the spring is a steel spring (75) arranged in a decentralized or eccentric recess (76) in the retaining disk (77), on the one hand on the retaining disk (77) and on the other hand, possibly via a Connecting element (78) - on the locking plate (39 ') engages.

24. Carrying structure according to claim 23, d ad urch gekennzeichn et, that the support disc (77) and a central hub (38 ") in the support disc (77) has a passage (74).

25. Hollow body of clamped sheet material (86) with a support structure (80) according to one of the preceding claims, g eken nich net you rch a spacer (81) made of elastic material between an upper or a lower portion (83) of the support structure (80 ) and an adjacent portion of the stretched sheet material (86).

26. Carrying structure according to one of claims 7 to 25, dad u rch ge nzeich et et that the locking disc is connected via a shaft with the manual adjuster in connection.

27. Support structure according to claim 26, dad urch in that the locking disc is in firm connection with the manual adjuster via the shaft.

28. Support structure according to claim 27, dad urch in that the manual adjuster is firmly connected via the shaft with a driving plate and that the locking disc is externally connected to the driving plate.

29. Carrying structure according to claim 28, characterized in that the locking disk is attached externally to the driving disk.

30. Carrying structure according to claim 29, d ad urch ge indicates that the manual adjuster, the shaft and the driving plate from

Plastic exist and that the locking disc is a metal disc.

31. Carrying structure according to claim 26, dad urch g e ken nzeich n et that the locking disc via a ball bearing with the driving plate slidably, but not rotatably connected.

32. Carrying structure according to one of claims 26 to 30, dad u rch ge ken nzeichnet that a cable feedthrough centrally through the locking disc, optionally the metal plate, the shaft and the manual adjuster runs.

33. Carrying structure according to claim 26, wherein the central holding element comprises a central cylindrical hub with a cylindrical wall which has an internal thread.

34. Carrying structure according to claim 33, characterized in that the locking disc has an external thread which engages in the internal thread of the central cylindrical hub.

35. Carrying structure according to claim 33, dad urch in that the driving plate has an external thread which engages in the internal thread of the cylindrical hub.

36. Carrying construction according to one of claims 27 to 32, dad urch g eken nzeich n et that the central support member comprises a central cylindrical hub having on at least one side a cover plate with a central cover plate hole and opposite the cover plate has a bottom plate and that the shaft extends through the cover plate hole and is provided with a male threaded portion which engages an internal thread of the central hub for stepless self-locking height adjustment.

37. Carrying structure according to claim 36, characterized that the cover plate hole is formed as the internal thread of the central hub, in which engages the male threaded portion of the shaft.

38. A support structure according to any one of claims 26 to 37, characterized in that the bottom plate has a bottom threaded hole into which the male threaded portion of the shaft engages.

39. Carrying construction according to one of claims 26 to 36, d ad u rch g e ken nzeich net that the bottom plate arranged opposite the cover plate of the hub is self-locking height adjustable and has an external thread which engages in an internally threaded portion of the hub.

40. Carrying structure according to one of claims 26 to 39, d ad u rch ge ken nzeich n et that inner end portions of rod extensions are designed and stored so that they are supported on the bottom plate of the hub when the locking disc and / or the bottom plate are height-adjusted towards the end sections.

41. Carrying structure according to claim 40, characterized in that the end sections of the rod extensions are rounded.

42. Carrying structure according to claim 40, d ad u rch geken nzeic hn et, a roller is mounted on the end sections of the rod extensions.

43. Carrying structure according to one of claims 36 to 42, d e urch ge ken n zeic h net, that on the central, substantially cylindrical hub to a fictitious central axis radial projections are arranged, which receive the transverse axes of the rod extensions.

44. Carrying structure according to claim 43, dad urch in that each projection has two parallel legs, between which inner ends of the rod extensions are mounted on the transverse axes.

45. A support structure according to claim 43 or 44, characterized in that the projections are integrally formed on the central, substantially cylindrical hub.

46. A support structure according to any one of the preceding claims, characterized in that each rod extension has at least an inner portion and an outer portion which receive at least two ends of the rods.

47. Carrying structure according to claim 46, characterized that the outer portion of the rod extension is widened with respect to the inner portion.