Apparatus for unfolding a mast

Abstract

The invention relates to an apparatus for unfolding a rolled-up, elongate hollow body, having: at least one elongate hollow body which has a closed cross-sectional profile, and an unfolding mechanism which has a winding core on which the elongate hollow body is rolled up and compressed in a first state and which, by rotation, transfers the elongate hollow body from the first state into an unrolled and unfolded second state, wherein the unfolding mechanism has a supporting device, wherein the supporting device has an inner supporting element which is arranged in a cavity within the elongate hollow body and at least partially lies against the inner wall of the elongate hollow body, and has an outer fixing element which is arranged outside the elongate hollow body in the region of the inner supporting element such that the elongate hollow body can be guided through between the outer fixing element and the inner supporting element, wherein the inner supporting element interacts with the outer fixing element in a form-fitting and/or force-fitting manner for the axial positional fixing of the inner supporting element without being directly mechanically connected thereto.

Claims

1. An apparatus for unfolding a rolled-up, elongate hollow body, comprising: at least one elongate hollow body which has a closed cross-sectional profile, and an unfolding mechanism which has a winding core on which the at least one elongate hollow body is rolled up and compressed in a first state and which, by rotation, transfers the at least one elongate hollow body from the first state into an unrolled and unfolded second state, wherein the unfolding mechanism has a supporting device which comprises an inner supporting element arranged in a cavity within the at least one elongate hollow body and which at least partially lies against an inner wall of the at least one elongate hollow body, and an outer fixing element arranged outside the at least one elongate hollow body in a region of the inner supporting element such that the at least one elongate hollow body is guidable between the outer fixing element and the inner supporting element, wherein the inner supporting element interacts with the outer fixing element in an axial direction of the at least one elongate hollow body in a form-fitting and/or force-fitting manner for axial positional fixing of the inner supporting element without being directly mechanically connected thereto.

2. The apparatus according to claim 1, wherein the unfolding mechanism has a framework on which the winding core and the outer fixing element are fixedly arranged.

3. The apparatus according to claim 1, wherein the supporting device of the unfolding mechanism is arranged in a transition region within which one section of the at least one elongate hollow body is unrolled from the winding core, but is not completely unfolded.

4. The apparatus according to claim 1 wherein the supporting device further comprises at least one form-fitting mechanism which in each case has at least two form-fitting elements, wherein a first form-fitting element of the at least two form-fitting elements is arranged on the supporting device and a second form-fitting element of the at least two form-fitting elements is arranged on the outer fixing element such that the at lest one elongate hollow body is guidable between the first and the second form-fitting element, wherein the first form-fitting element forms a form-fitting connection with the second form-fitting element in the axial direction of the at least one elongate hollow body.

5. The apparatus according to claim 4, further comprising a third form-fitting element which is either arranged on the supporting element and interacts with the second form-fitting element in a form-fitting manner, or which is arranged on the fixing element and interacts with the first form-fitting element in a form-fitting manner.

6. The apparatus according to claim 4, wherein the at least one form-fitting mechanism of the supporting device comprises a plurality of form-fitting mechanisms.

7. The apparatus according to claim 6, wherein at least two form-fitting mechanisms of the plurality of form-fitting mechanisms are arranged in such that a plane of contact surfaces of the form-fitting elements of a first form-fitting mechanism of the at least two form-fitting mechanisms run at an angle of less than 180 with respect to a plane of contact surfaces of the form-fitting elements of a second form-fitting mechanism of the at least two form-fitting mechanisms.

8. The apparatus according to claim 6, wherein at least a first form-fitting mechanism of the at least two form-fitting mechanisms is provided on the supporting device on a first side with respect to the at least one elongate hollow body and at least a second form-fitting mechanism of the at least two form-fitting mechanisms is provided on the supporting device on a second side, which lies opposite the first side, with respect to the at least one elongate hollow body.

9. The apparatus according to claim 1 wherein the inner supporting element has a sliding surface along which the inner wall of the at least one elongate hollow body slides for shape stabilization during transfer of the at least one elongate hollow body from the first state into the second state.

10. The apparatus according to claim 9, wherein the sliding surface is shaped conically in an unfolding direction of the at least one elongate hollow body.

11. The apparatus according to claim 1 wherein the inner supporting element has one or more supporting rolls and/or supporting sliders which are in contact with the inner wall of the at least one elongate hollow body for shape stabilization during the transfer of the at least one elongate hollow body from the first state into the second state.

12. The apparatus according to claim 11, wherein at least one of the one or more supporting rolls and/or supporting sliders has a mating roll and/or mating slider of the outer fixing element which is arranged in such a manner that the at least one elongate hollow body is guidable between the at least one of the one or more supporting rolls and/or supporting sliders of the supporting element and the mating roll and/or mating slider of the outer fixing element with contact.

13. The apparatus according to claim 1 wherein the outer fixing element has a molded shell which corresponds to a shape of the at least one elongate hollow body at at least one position and through which the at least one elongate hollow body is guidable.

14. The apparatus according to claim 1 wherein the supporting device comprises a magnet device for force-fitting axial positional fixing of the inner supporting element, wherein the magnet device comprises at least one first magnet is arranged on the supporting element and at least one second magnet arranged on the outer fixing element, wherein the at least one first magnet and the at least one second magnet interact such that a magnetic force exerted therebetween fixes the inner supporting element at the axial position within the cavity of the at least one elongate hollow body.

15. The apparatus according to claim 1 wherein the at least one elongate hollow body includes two, three, four or more elongate hollow bodies rolled up and compressed on the winding core in a respectively first state, wherein, by rotation of the winding core, all of the two, three, four or more elongate hollow bodies are transferred from the first state in each case into an unrolled and unfolded second state, and wherein each of the two, three, four or more elongate hollow bodies has a dedicated supporting device.

16. The apparatus according to claim 1 wherein the at least one elongate hollow body is produced from a fiber composite material comprising a fiber material and a matrix material embedding the fiber material, or wherein the at least one elongate hollow body is produced from a metal material.

Description

[0043] The invention is explained by way of example with reference to the attached figures, in which:

[0044] FIG. 1 shows an embodiment of the apparatus in the rolled-up state;

[0045] FIG. 2shows an embodiment of the apparatus in the unfolded state;

[0046] FIG. 3shows a perspective illustration of an elongate hollow body with a supporting device;

[0047] FIGS. 4a) to 4c)show an illustration of a supporting device in a first embodiment;

[0048] FIG. 5 shows a supporting device in a second embodiment;

[0049] FIGS. 6a) to 6b) show a supporting device in a third embodiment.

[0050] The form-fitting elements shown in the following figures and the description thereof are of roll-shaped design. However, in principle, all of the form-fitting elements of roll-shaped design can also be replaced by spherical or dome-shaped form-fitting elements. The illustrations shown are therefore only by way of example.

[0051] FIG. 1 shows an illustration of the apparatus 10 according to the invention with which four elongate hollow bodies in the form of unfoldable masts can be extended. The apparatus 10 has an unfolding mechanism 11 which, in the interior, has a winding core 12 (not illustrated) on which the elongate hollow bodies 14 are rolled up and compressed in a first state. The elongate hollow bodies 14 are accordingly compressed in the manner of a flat band and are thus wound up on the cylindrical winding core 12. In the exemplary embodiment of FIG. 1, all of the four elongate hollow bodies are rolled up simultaneously on the winding core 12 in such a manner that they are rolled up one above another and can be unrolled simultaneously. FIG. 1 shows an illustration in which all of the elongate hollow bodies are rolled up on the winding core 12 and are therefore present in a first state.

[0052] The winding core 12 is arranged rotatably here on a carrying structure 13 of the unfolding mechanism 11, wherein carrying arms 15 extend from the winding core 12 of the unfolding mechanism 11 in a star-shaped manner and have corresponding guide elements 16, with the aid of which the rolled-up hollow bodies 14 are unrolled into their respective carrying arms 15 and in the process are supplied at the respective supporting device 20.

[0053] Each of the carrying arms 15 of the carrying structure 13 of the unfolding mechanism 11 has one such supporting device 20, and therefore each of the rolled-up hollow bodies 14 receives its own supporting device 20 with which the respective, rolled-up hollow body 14 is correspondingly supported in its transition region during the unfolding process.

[0054] FIG. 2 shows the apparatus illustrated in FIG. 1 in a second, unrolled and unfolded state of the hollow bodies 14. As can be seen, each of the elongate hollow bodies 14 has been guided through the respective supporting device 20 during the unrolling process, wherein the supporting device 20 is fixedly connected to the carrying structure 13 owing to the fixed arrangement to the respective carrying arm 15 and therefore in particular cannot carry out any relative movement in relation to the winding core. It is thereby ensured that, when the elongate hollow bodies 14 are unfolded, the latter carry out a relative movement in relation to the supporting device 20 in the axial direction of the unfolding direction R.sub.1. The effect achieved by this is that the supporting device 20 is always arranged within the transition region 17 where the unfolding hollow bodies 14 do not yet have their fully unfolded cross-sectional profile, and therefore the stability and rigidity of the respective hollow bodies 14 is reduced in this transition region 17. FIGS. 1 and 2 show an apparatus 10 with which a total of four elongate hollow bodies 14 in the form of an unfoldable mast can be extended. In principle, however, the concept of the supporting device 20 in the transition region 17 is not restricted to the number of the hollow bodies 14, and therefore it is, of course, also conceivable for such a supporting device 20 to be able to be used in an apparatus having only one hollow body, two hollow bodies, three hollow bodies or even more than four hollow bodies.

[0055] FIG. 3 shows by way of example a hollow body 14 which has an elongate section which is already fully unfolded. The hollow body 14, as illustrated in FIG. 3, has been formed from two half shells 14a) and 14b) which have an omega-shaped cross section. In the rolled-up state, the hollow body 14 is present in the form of a rolled-up and compressed, flat band 18 which can be termed the first state. When completely unfolded, the elongate hollow body has a second state 19 in which the hollow body 14 has a double omega-shaped cross-sectional profile. The hollow body 14 has its greatest stability in the second state 19.

[0056] The cross-sectional profile of the second state 19 is developed continuously in the transition region between the first state 18 and the second state 19, wherein the hollow body 14 has not yet reached its corresponding final stability in this transition region 17. There is in particular the risk here that the elongate hollow body will buckle in the transition region 17 and will therefore damage the entire apparatus.

[0057] According to the invention, the supporting device 20 is arranged for this purpose in the transition region 17, said supporting device having a supporting element (not illustrated in FIG. 3) which lies within the hollow body 14 in the transition region 17, and also an outer fixing element 21 in order thus to position the inner supporting element in a form-fitting and/or force-fitting manner in the axial direction. It is therefore ensured that the inner supporting element which is intended to ensure additional stability of the elongate hollow body 14 in the transition region 17 remains within the transition region 17 although the hollow body 14 has a closed cross-sectional profile. By means of the form-fitting and/or force-fitting fixing of the inner supporting element in the axial direction with the aid of the fixing element 21, there does not need to be any direct mechanical connection of the fixing element 21 with the inner supporting element.

[0058] FIG. 4a) shows an embodiment of the supporting element 20, in which part of the outer fixing element 21 has been removed for the sake of better illustration. This makes it possible to see the inner supporting element 22 which is normally arranged within the hollow body 14. For the sake of better illustration, the hollow body 14 is also no longer illustrated in the following figures. For better understanding, the hollow body 14 would be guided through here between the inner supporting element 22 and the outer fixing element 21 when the hollow body is transferred from its rolled-up, first state into its unfolded, second state.

[0059] FIG. 4a) illustrates a form-fitting mechanism 30 which, in the exemplary embodiment of FIG. 4a), has a first form-fitting element 31, a second form-fitting element 32 and a third form-fitting element 33. The first form-fitting element 31 and the third form-fitting element 33, which are in the form of small rolls or rollers, are arranged here on the inner supporting element 22 while the second roll-shaped form-fitting element 32 is arranged on the part not visible of the outer fixing element 21.

[0060] The elongate hollow body guided through the supporting element 20 would accordingly have to be guided through between the second form-fitting element 32 of the fixing element 21, on the one hand, and the two other form-fitting elementsthe first form-fitting element 31 and the third form-fitting element 33 of the supporting element 22.

[0061] The three form-fitting elements 31 to 33 are arranged with respect to one another here in such a manner that the elongate hollow body cannot be guided through in a straight line between the form-fitting elements but rather is pressed in the direction of the inner supporting element 22 by the second form-fitting element 32. The first and the third form-fitting elements 31 and 33 serve here as bearing points, whereas the second form-fitting element 32 presses the region of the elongate hollow body between the two form-fitting elementsthe first and the third form-fitting elementsin the direction of the inner supporting element 22.

[0062] By this means, a form-fitting connection in the axial direction of the inner supporting element 22 with the fixing element 21 is achieved since the second form-fitting element 32 forms a type of undercut on the fixing element in relation to the first and the third form-fitting element of the supporting element 22, said undercut bringing about a form-fitting connection in the axial direction of the inner supporting element 22.

[0063] In the exemplary embodiment of FIG. 4a), there is also such a form-fitting mechanism 30 on the opposite side, as can be seen in FIGS. 4b) and 4c). By means of the second form-fitting element 32 of the respective form-fitting mechanism, the inner supporting element is clamped here between said two form-fitting mechanisms and therefore cannot move in the axial direction.

[0064] The inner supporting element 22 can be seen in FIG. 4b) without the outer fixing element 21, wherein, for the sake of completeness, the second roll-shaped form-fitting elements 32 which are necessary for the form-fitting connection are also illustrated at the same time. In the unfolding direction R.sub.1, there is a sliding surface 23 on the inner supporting element, which sliding surface can be provided to lie against an inner wall of the elongate hollow body and to slide therealong and, furthermore, to prevent buckling of the elongate hollow body. The lateral ends of the sliding surface 23 have wings 24 which additionally supports the elongate hollow body in the transition region of the two half shells.

[0065] Furthermore, in the exemplary embodiment of FIGS. 4a) to 4c), the inner supporting element 22 has additional supporting rolls 25 with which the inner wall of the elongate hollow body is in contact without a form-fitting connection in its axial direction. It is thereby ensured that the inner supporting element 22 does not tilt within the elongate hollow body and therefore unfolding becomes impossible. Said supporting rolls 25 of the inner supporting element 22 can be supported here by mating rolls 26 arranged on the outer fixing element 21, and therefore the elongate hollow body is guided through between the supporting roll 25 of the inner supporting element 22 and the mating roll 26 of the outer fixing element 21.

[0066] The advantage of this variant illustrated in FIGS. 4a) to 4c) consists in that axial fixing of the inner supporting element 22 is brought about just with two form-fitting mechanisms 30, as a result of which the elongate hollow body is deformed only at two points during the unfolding because of the intended form-fitting connection. With the aid of the laterally arranged supporting rolls 25 which run at an angle, a lateral support of the inner supporting element 22 can be achieved here, as a result of which tilting of the inner supporting element 22 can be prevented.

[0067] FIG. 4c) illustrates the inner supporting element 22 once again in a form in which the first form-fitting mechanism 30a) and the second opposite form-fitting mechanism 30b) of the supporting device can clearly be seen. It can also be seen that an elongate hollow body which is guided through between the second form-fitting element 32 of the outer fixing element and the two form-fitting elementsthe first and third form-fitting elements 31 and 33of the inner supporting element is deformed in the direction of the inner supporting element because of the arrangement of the second form-fitting element 32, as a result of which a corresponding form-fitting connection of the inner supporting element to the second form-fitting elements 32 of the outer fixing element is formed.

[0068] FIG. 5 shows an exemplary embodiment of an inner supporting element which, except for the form-fitting mechanism 30, is formed merely as a complete sliding surface 23, and therefore the inner wall of the elongate hollow body lies against the entire sliding surface 23 while the inner supporting element 22 is fixed axially in its position in the axial direction because of the form-fitting mechanism 30. However, in this embodiment, the inner wall friction is significantly greater, and therefore suitable materials have to be used here. The overall stability is thus significantly greater.

[0069] FIGS. 6a) and 6b) show a third embodiment in which a total of four form-fitting mechanisms 30a) to 30d) are provided. Each of said form-fitting mechanisms is constructed as already intensively described in FIGS. 4a) to 4c).

[0070] A particular feature in this embodiment is the arrangement of the individual form-fitting elements of the various form-fitting mechanisms 30a) to 30d). The axes of the form-fitting elements of the first form-fitting mechanism 30a) run here at an angle to the axes of the form-fitting elements of adjacent form-fitting mechanisms (for example second form-fitting mechanism 30b) or fourth form-fitting mechanism 30d)), wherein the angle is smaller than 180 degrees. The individual roll-shaped form-fitting elements of the various form-fitting mechanisms are therefore arranged obliquely with respect to one another, wherein opposite form-fitting mechanisms can have corresponding parallel axes their form-fitting elements. By this means, there does not need to be any further supporting rolls within the core since the inner supporting element 22 is supported in all of its directions by said four form-fitting mechanisms 30a) to 30d). However, in this variant embodiment, the elongate hollow body is deformed at a total of four different points in order to obtain the form-fitting connection, which is associated with a generally higher material loading. Such a supporting element 22 thus has fewer rotating parts in comparison to the first variant in FIGS. 4a) to 4c) and is therefore possibly less fragile.

LIST OF REFERENCE SIGNS

[0071] 10 Apparatus for the unfolding [0072] 11 Unfolding mechanism [0073] 12 Winding core [0074] 13 Carrying structure [0075] 14 Elongate hollow body [0076] 15 Carrying arms [0077] 16 Guide elements [0078] 17 Transition region [0079] 18 First state [0080] 19 Second state [0081] 20 Supporting device [0082] 21 Outer fixing element [0083] 22 Inner supporting element [0084] 23 Sliding surface [0085] 24 Sliding surface wing [0086] 25 Supporting rolls [0087] 26 Mating rolls [0088] 30 Form-fitting mechanism [0089] 31 First roll-shaped form-fitting element [0090] 32 Second roll-shaped form-fitting element [0091] 33 Third roll-shaped form-fitting element [0092] R.sub.1 Axial unfolding direction