FR2858389A1 - VARIABLE GEOMETRY BRACKET WITH PARALLELOGRAM STRUCTURE - Google Patents

Abstract

Support with variable geometry movable between folded and unfolded positions in which the upper (70) and lower (72) ends of the support are brought together and separated, respectively, comprising at least one articulated parallelogram structure (30b; 30i; 30h) comprising opposing upper (32b; 32i; 32h) and lower (34b; 34i; 34h) knee pads, brought together in said folded position and spread apart in said unfolded position, and left (36b; 36i; 36h) and right (38b; 38i) knee pads; 38h) opposed, spaced apart in said folded position and brought together in said unfolded position. The support according to the invention is remarkable in that it comprises unfolding means (74b; 74i; 74h) tending to bring the left knee pads permanently ( 36b; 36i; 36h) and right (38b; 38i; 38h).

Description

The invention relates to a mobile variable geometry support between

  folded and unfolded positions in which upper and lower ends of said support are spaced apart and spaced, respectively, having at least one articulated parallelogram structure having opposed upper and lower knee braces, brought together in said folded position and spaced in said unfolded position, and left and right kneepads opposite, spaced apart in said folded position and brought together in said unfolded position. The invention also relates to the use of such a medium, in particular for an information presentation device.

  Conventionally, as described in the French patent application No. 01/03170 filed March 8, 2001 by the Applicant, an information presentation device comprises a sheet capable of carrying information, a hollow winding drum of the sheet mounted rotating about its longitudinal axis on a base, and means for automatically winding the web around this drum.

  Such a device makes it possible to wrap around the drum a large flexible sheet on which are, for example, fixed or printed images, to easily transport it, without crumpling, in a living room or exhibition, and then to unroll it for present these images. Conventionally, the unrolled sheet 20 is stretched between the drum to which its lower edge is fixed, and an upper attachment point of a support, for example a hook disposed in the upper part of a bracket, to which the upper edge of the sheet is hooked.

  Generally, the bracket is in the form of a telescopic mast or is formed by assembling a plurality of interlocking members into each other. The mounting of these brackets is often complex and long, especially if the number of elements to assemble is high.

  The object of the present invention is to provide a new type of support, which can replace the brackets according to the prior art, but easy and quick to assemble.

  This object is achieved by means of a variable geometry support movable between folded and unfolded positions in which upper and lower ends of said support are brought together and spaced, respectively, comprising at least one articulated parallelogram structure comprising upper and lower knee pads. opposed, reciprocated in said folded position and spaced apart in said unfolded position, and opposite left and right kneepads, spaced in said folded position and brought together in said unfolded position. According to the invention, this support is remarkable in that it comprises unfolding means tending to bring said left and right kneepads permanently closer together.

  As will be seen in more detail in the following description, the action of bringing together the left and right kneepads by the unfolding means 10 advantageously allows the parallelogram structure to unfold to the unfolded position in a simple manner and fast.

  According to other preferred features of the invention, said unfolding means comprise an elastic which, advantageously does not rust, is inexpensive, and avoids any risk of pinching; said unfolding means are fixed on axes of said left and right kneepads, which advantageously optimizes the effectiveness of their action; said support comprises an elastic forming a closed loop wound around said axes of said left and right kneepads, which advantageously simplifies assembly and therefore limits manufacturing costs; said support comprises folding means tending to bring said upper and lower kneepads permanently together, which advantageously limits the effort of the user to operate the folding of the support; said folding means are shaped to compensate for the action of said unfolding means, so that said support, for example when it is arranged to extend substantially in a vertical plane, is in static equilibrium, which , advantageously, allows to simply position the support substantially in any intermediate position between the unfolded and folded positions; said support comprises locking means in said unfolded position, self-locking when said support reaches said unfolded position, which, advantageously, allows automatic detection, that is to say without voluntary intervention of the user for this purpose, the unfolded position, and an automatic lock in this position; said upper toggle has two branches hinged about an upper toggle axis and extending on the other side of said upper toggle axis to form two branches of a lower toggle joint of another parallelogram structure, which advantageously , allows to couple several parallelogram structures one above the other so as to increase the maximum height of the support in the unfolded position, without increasing its length L in the folded position; said folding means comprise at least one drum mounted for axial rotation around a winding axis on a base of said support, a sheet fixed on the one hand on said drum and on the other hand on said upper end of said support. and elastic means for winding said web around said drum; said support comprises pawl means comprising a lever integral with said base and in permanent resilient support on a winding surface 20 of said drum, said winding surface comprising a housing or a projection in which said lever can snap; said ply is fixed on said drum so as to cover said housing or said projection as long as said support has not reached a position in which said ply is substantially completely unwound, which advantageously allows the lever to be unable to snap into the housing or protrusion only when the web is completely unrolled; said support comprises a box receiving said structure in said folded position, which advantageously makes it possible to store the support in order to facilitate its handling and its transport; said parallelogram structure is a diamond structure.

  The invention also relates to the use of a support according to the invention in an information presentation device, a blind, or an awning.

  Other features and advantages of the present invention will appear on reading the following description and on examining the appended drawing in which - FIGS. 1 and 2 represent an information presentation device incorporating a support according to FIG. invention in a folded position; FIGS. 3 and 4 are perspective views of an information presentation device incorporating a support according to the invention in an intermediate position between the folded position and an unfolded position; FIGS. 5 and 6 show detailed views of the information presentation device of FIGS. 3 and 4; FIGS. 7 to 9 show detail views of ratchet means that can be used on the information presentation devices of FIGS. 1 to 6; - Figure 10 shows a perspective view of another information presentation device incorporating a support according to the invention in an unfolded position.

  Identical references are used in the various figures to designate identical or similar members.

  The following description of the drawings assumes that the presentation device according to the invention is laid flat on a horizontal plane, in a position permitting vertical unwinding and winding of the web.

  Of course, the presentation device could also be arranged so that the sheet unwinds in other directions, especially under the trunk or, particularly in the case where the chest would be arranged vertically, parallel to the ground.

  Reference is now made to Figures 1 to 5.

  A presentation device 1 comprises a flexible ply 3, for example rectangular, (see FIG. 5), for example made of plastic, on which images or information can be printed or fixed, a drum 5 for winding up the ply 3 , hollow and rotatably mounted about its longitudinal axis, or winding axis T, in a box 6 of protection, winding means, not shown, being arranged inside the drum 5.

  For clarity of the figures, the web 3 is only shown in Figure 5, partially.

  Preferably, one or more feet 7 are fixed on the trunk 6 to ensure the stability of the presentation device 1 on the floor.

  The lower edge of the ply 3 is preferably directly attached, preferably in a removable manner, to a first edge of a flexible primer (not shown), for example by means of a VELCRO type fastener, a zipper or glue. A second edge of the primer, opposite to the first edge, is fixed on a winding surface 14 of the drum 5, that is to say on the outer, substantially cylindrical surface of the drum 5 on which the web 3 and the primer can roll up. The primer is unwound so that its first edge can extend outside the trunk 6 when it is fully unwound.

  An upper edge 9 of the web 3, opposite the lower edge, is preferably attached to an upper rod 11. The upper rod 11 is preferably removably mounted on a reinforcing bar 12.

  Preferably, the upper strip 11 comprises a longitudinal bead longitudinally split and stepped so as to be able to engage elastically in a complementary longitudinal groove 16 formed in the reinforcing bar 12 to ensure both the front mounting of the strip 25 upper 11 and its retention relative to the reinforcing bar 12.

  The trunk 6 protector, elongate, is slit with a longitudinal opening 17, opening substantially vertically, by which the web 3 and a support 20 according to the invention can be deployed. Preferably, the trunk 6 comprises a rear flange, not shown to reveal the inside of the trunk, arranged so that, in the unfolded position of the support 20, only the opening 17 provides access to the inside of the trunk. trunk 6. Preferably, the trunk 6 is closed by lateral flanges 21.

  The reinforcing bar 12 is shaped so that, in the folded position, it bears on an edge 22 of the opening 17 so as to not be able to penetrate inside the box 6 under the effect of the winding means arranged to the inside of the drum 5. Preferably, the reinforcement bar 12 is also shaped so as to close, in the folded position of the support (see FIG. 7), the opening 17.

  In the folded position of the support, the sheet 3 is totally wound around the drum 5, the box 6 enclosing and protecting the sheet 3 and the support 20.

  The support 20 comprises first, second and third rhombic structures, called lozenges, called high structures 30h, intermediate 30i, and low 30b, respectively, similar, superimposed, and able to extend in a substantially vertical plane V. In In the rest of the description, the indices h, i and b are used to designate members belonging to the high 30h, intermediate 30i and low 30b lozenges, respectively.

  A rhombic structure 30h, 30i and 30b has upper knee braces 32h, 32i and 32b and lower 34h, 34i and 34b and left knee braces 36h, 36i and 36b and right 38h, 38i and 38b, respectively. A diamond structure comprises first 40h, 40i and 40b and second 42h, 42i and 42b upper branches and first 44h, 44i and 44b and second 46h, 46i and 46b lower branches. The first and second upper branches of a rhombus are rotatably mounted on one another to form the upper toggle joint 32h, 32i and 32b. The first and second lower branches of a rhombus are rotatably mounted on each other to form the lower toggle 34h, 34i and 34b. The first upper and lower limbs are rotatably mounted on each other to form the left toggle joint 36h, 36i and 36b. Finally, the second upper and lower limbs are rotatably mounted on each other to form the right knee brace 38h, 38i and 38b.

  The axes 52h, 52i, 52b, 54h, 54i, 54b, 56h, 56i, 56b, 58h, 58i and 58b of the knee pads 32h, 32i, 32b, 34h, 34i, 34b, 36h, 36i, 36b, 38h, 38i and 38b are parallel and substantially perpendicular to the vertical plane V of the deployment of the support 20.

  The axis 54b of the lower knee joint 34b of the low rhombus 30b is fixed on a base 60 of the trunk 6 (see FIG. 6).

  The axis 52h of the upper knee 32h of the high diamond 30h is fixed on the reinforcing bar 12 (see Figure 5).

  To form, on the one hand, the lower knee joint 34h of the high rhombus 30h and the upper knee joint 32i of the intermediate rhombus 30i, two bars 62 and 64 are rotatably mounted on one another along the axis 52i passing substantially in their direction. middle, thus forming a hinged high cross, the first bar 62 defining the first lower branch 44h of the high rhomb 30h and the second upper branch 42i of the intermediate rhomb 30i, the second bar 64 defining the second lower branch 46h of the high rhomb 30h and the first upper branch 40i of the intermediate rhombus 30i. Thus, the axis 54h of the lower knee joint 34h of the high rhombus 30h is it coincident with the axis 52i of the upper toggle joint 32i of the intermediate rhombus 30i.

  Similarly, to form on the one hand the lower knee joint 34i of the intermediate rhombus 30i and the upper knee joint 32b of the lower rhombus 30b, two bars 66 and 68 are rotatably mounted on one another along the axis 52b passing substantially in their middle, thus forming a low articulated cross, the first bar 66 defining the first lower leg 44i of the intermediate rhombus 30i and the second upper branch 42b of the lower rhombus 30b, the second bar 68 defining the second lower branch 46i of the intermediate rhombus 30i and the first upper branch 40b of the low rhombus 30b. Thus, the axis 54i of the lower toggle joint 34i of the intermediate rhombus 30i coincides with the axis 52b of the upper toggle joint 32b of the lower rhombus 30b.

  The structure described above thus forms an articulated lattice capable of being deployed in a plane, from a folded position in which the lattice is stored in the trunk 6 (FIGS. 1 and 2) to an unfolded position. Advantageously, the lozenge structure allows spacing or translation approximation of the upper ends 70 and lower 72 of the support 20 relative to each other during the modification of the geometry of the support 20 according to the invention.

  According to the invention, an elastic 74h, 74i and 74b is stretched between the axes of the left and right knee braces, 36h and 38h, 36i and 38i, and 36b and 38b, lozenges 30h, 30i and 30b, respectively, thus tending bringing the left and right knee braces closer to the rhombs 30h, 30i and 30b, and thus to deploying the support 20. Preferably, the length of the elastic is determined so that, whatever the position of the support 20 between the folded and unfolded, the consequences of lengthening the elastic band are never irreversible.

  The means of unfolding tending to bring the left and right kneepads permanently together are not limited to elastics. For example, springs or jacks could also be used. Advantageously, the use of an elastic 74h, 74i and 74b is inexpensive and safe. Unlike a spring, an elastic avoids any risk of pinching, does not rust, and is easy to install. In addition, a rubber band is advantageously more reliable, any seizure being excluded, and less expensive than a jack.

  To facilitate the installation of the elastic, preferably the elastic 74h, 74i and 74b is formed in a closed loop, and wound as shown in Figure 5, about the axes of the left and right knee. A second elastic 76, shown hatched in FIG. 5, can be stretched parallel to the elastic 74h, 74i and 74b between the left and right knee axes, 36h and 38h, 36i and 38i, and 36b and 38b, diamonds. 30h, 30i and 30b, respectively, on the other side of the plane V of deployment of the support 20.

  The action of the elastics, tending to unfold the support 20, is counteracted by the action of the winding means of the sheet 3 on the drum 5.

  Preferably, the tension of the elastic bands 74h, 74i and 74b, the friction of the various bars of the support 20 between them at their joints, and the force exerted by the winding means on the sheet 3, are determined by the skilled in the art, so as to obtain a static equilibrium of the sheet 3 in a wide range of positions between the folded position and the unfolded position. Preferably, the range of equilibrium positions includes all positions between a low limit corresponding to a minimum unfolding of the support, for example after unwinding about fifty centimeters from the web 3, and the unfolded position.

  The compensation between the forces exerted on the sheet 3 by the winding means 30 on the one hand and by the elastics 74h, 74i and 74b on the other hand allows an effortless positioning of the sheet 3 in any position of the range of equilibrium positions of the support 20.

  Advantageously, in the range of equilibrium positions of the support 20, the sheet 3 remains in position as soon as the user stops exerting an effort tending to unwind or wind it. It is thus possible to expose a variable length of the sheet 3 without additional blocking means.

  Preferably, the information presentation device, however, comprises means, not shown, for locking in the unfolded position of the support 20. Advantageously, the unfolded position is thus stable and does not risk being modified for example by an inappropriate action a user tending to wind the web 3.

  Preferably, the locking means are automatic, that is to say that they engage themselves when the support 20 reaches the unfolded position.

  In addition, as shown in FIGS. 7 to 9, the information presentation device preferably comprises a lever 80 rotatably mounted on the base 60 along an axis P parallel to the axis T of the drum 5, and means Elastic members, for example a spring 82, symbolized in FIG. 9, tending to push in the direction F (see FIG. 9) a bearing portion 84 of the lever 80 on the winding surface 14 of the drum 5.

  On the winding surface 14, outside the drum 5, a housing 86, or projection, is arranged at least opposite the bearing portion 84 of the lever 80, so that the bearing portion 84 can snap into the housing 86 under the action of the spring 82.

  Preferably, the housing 86 is shaped so that after engagement of the bearing portion 84, the rotation of the drum 5 about its axis T is blocked only in the direction of the winding E (see Figure 7). Spring 82, lever 80, and housing 86 thus constitute pawl means.

  Preferably, the housing 86 is arranged to be covered by the primer and / or the sheet 3 when the latter are at least partly wound on the drum 5.

  Preferably, the lever 80 comprises, on the opposite side to its axis of rotation P 30 relative to the bearing portion 84, a control portion 88 by means of which a user can disengage the bearing portion 84 from the housing 86.

  The operation of the information presentation device is as follows.

  In a row position of the information presentation device, as shown in FIG. 7, the support 20 is in the folded position, stored in the trunk 6, the rhombs 30h, 30i and 30b of the structure being folded back on themselves so that their upper and lower knee pads are adjacent to each other and their right and left kneepads are spaced from each other. The web 3 is also in the trunk 6, completely wound around the drum 5. The reinforcement bar 12 substantially closes the entire opening 17. In this position, the trunk and the reinforcement bar 12 therefore define a substantially firm housing.

  To unfold the support 20 according to the invention, the user, after having placed on the floor the trunk 6 and possibly deployed the feet 7, pulls substantially vertically on the reinforcing bar 12. The action of the user is favored by the action of the elastics 74h, 74i and 74b, and thwarted by the action of the winding means 15 of the drum 5. The action of the elastics 74h, 74i and 74b is substantially equal to and opposite to that of the winding means, The user advantageously has no difficulty in lifting the reinforcing bar 12.

  When unfolding, the upper 70 and lower 72 ends apart from each other, while remaining aligned vertically. The left and right kneepads of each rhombus are close to each other. The elastics 74h, 74i and 74b relax.

  After crossing the lower limit of the range of equilibrium positions, the reinforcing bar 12 remains in equilibrium after the user has released it. Thus, in the range of the equilibrium positions, the unfolding can be stopped at any time in a partially unfolded or intermediate position or can be continued to the unfolded position of the support 20. The unfolded position can be defined by the end of the unwinding of the sheet 3, the fixing of the sheet 3 on the drum 5 then preventing any further spacing of the reinforcing bar 12 relative to the drum 5. The unfolded position can still be defined by locking means s' engaging in a predetermined position of the support 20. The unfolded position may finally result from the loss of effectiveness of the elastics 74h, 74i and 74b resulting from their relaxation. In the latter situation, any further elevation of the reinforcing bar 12 beyond the unfolded position indeed leads to a position in which the action of the winding means exceeds that of the elastics. The winding means therefore bring the reinforcement bar 12 5 to the unfolded position as soon as the user releases his force upwards on the reinforcement bar 12. The unfolded position is then the last position upwards where the action winding means and that of the elastics 74h, 74i and 74b compensate each other.

  Advantageously, the height of the support 20 is not limited by the size of the user, the elevation of the reinforcing bar 12 may be prolonged by an action of the user on the lozenges arranged in the lower part of the support 20 The support according to the invention therefore makes it possible to easily extend sheets on great heights while ensuring a very high stability.

  The user can continue unfolding the support 20 to the unfolded position. Preferably, the locking means engages when the support 20 reaches the unfolded position and prevents any involuntary folding of the support 20.

  Advantageously, the locking means are however optional, the support 20 remaining in equilibrium in the unfolded position.

  Advantageously, in the unfolded position, the rhombic structure of the support 20 imparts a very high stability to the information presentation device.

  To rewrap the web 3 around the drum 5, after having, if necessary, unlocked the locking means, the user acts on the reinforcing bar 12, the web 3 or the bars forming the diamond structures of the support 20 25 to bring the reinforcement bar 12 down. Advantageously, the elastics 74h, 74i and 74b stretched between the right and left kneepads diamond structures, avoid a sudden and immediate winding of the web 3 around the drum 5. Due to the compensation of the forces exerted by the elastics 74h, 74i and 74b and by the winding means, the user can interrupt the folding of the structure in any intermediate position.

  To change the web 3, the user unrolls it substantially completely until engagement of the support portion 84 in the housing 86.

  The housing 86 remains covered by the assembly formed by the web 3 and the primer, so inoperative, until the last revolution of the drum 5 before complete unwinding. Substantially until the fully unrolled position of the web 3, it is possible, at any time, to wind or unwind freely the web 3. In the last 5 round, the housing 86 is discovered. Passing the lever 80, the latter then engages, under the effect of the spring 82, in the housing 86, making it impossible any subsequent winding of the web 3 without user intervention on the control portion 88.

  The primer is then removed from the trunk 6. The user then pulls frontally, that is to say substantially perpendicular to the plane of the web 3, the upper rod 11 out of the groove 16 of the reinforcing bar 12. Similarly, it detaches the lower edge of the sheet 3 of the primer.

  To secure the upper edge of the replacement ply to the reinforcing bar 12, the user pushes the upper strip of this ply 15 in the groove 16 until the bead 15 snaps into place.

  To secure the lower edge of the replacement ply to the drum 5, the user fixes the lower edge of the replacement ply on the primer, for example by gluing. Advantageously, thanks to the primer, the replacement ply can thus be made integral with the drum 5 without the user having to intervene inside the trunk 6 to fix it directly on the winding surface 14 of the drum 5. .

  The user then releases the portion 84 of the housing 86 by pressing the control portion 88 of the lever, which allows the rotation of the drum 5 in the direction of the winding E. Preferably, as soon as the support portion 84 is disengaged from the housing 86, the drum 5 carries on itself a first winding turn during which the replacement ply or the primer covers the housing 86.

  The user can then release its action on the support portion 84, and continue winding the replacement ply around the drum 5 to the folded position of the support 20.

  As it is now clear, the support 20 according to the invention allows assembly and disassembly of the device according to the invention very fast, and low cost.

  Of course, the support according to the invention is not limited to the support described and shown. The support according to the invention could in particular comprise a number of

  any diamonds, for example to include only one rhombus.

  The support according to the invention could also be used to tension canopies, blinds, or any other device requiring the deployment and powering up of a sheet.

  The winding, in the folded position, of the web 3 around a drum is not a limiting constraint. Thus, in a variant of the invention as shown in FIG. 10, no winding means of the ply is provided, the ply resting, for example rolled up on itself, in bulk or folded, in the folded position of the support. The lower edge of the ply is fixed on a lower reinforcement bar 80 integral with the foot 7. Under the effect of the elastics stretched between the right and left kneepads, the support unfolds on its own, without the intervention of the user. , until the sheet 3 is stretched between the reinforcing bars 12 and 80. Advantageously, in this variant of the invention, the elastics thus serve not only means of unfolding the support, but also means of putting under tension of the sheet 3 in the unfolded position of the support.

  Advantageously, such an information presentation device is inexpensive, has good rigidity in the unfolded position of the support, and is compact in the folded position of the support.

  Two plies may advantageously be arranged on either side of the same support according to the invention.

  Thanks to the device according to the invention, it is also possible to produce objects of various shapes. For example, it is possible to use a plurality of supports according to the invention, the reinforcing bars of which would be connected to each other, so as to form, in the unfolded position, a column or a cabin. Thanks to the support according to the invention, it is advantageously possible to create an object delimited by a closed surface, no direct access to the support being necessary for its unfolding.

  It is also possible to couple two presentation devices according to the invention as described in Figures 1 to 9, placing them next to each other so that by unfolding the supports of these devices, it unwinds two layers hiding said supports.

  The number of lozenges provided with an elastic is not limiting. For example, only the 30h high diamond could be equipped with it.

Claims (14)

  A movable variable geometry support between folded and unfolded positions in which upper (70) and lower (72) ends of said carrier are spaced apart and spaced, respectively, having at least one articulated parallelogram structure (30b; 30i; 30h; ) having upper (32b; 32i; 32h) and lower (34b; 34i; 34h) toggles opposite, reclining in said folded position and spaced apart in said unfolded position, and left (36b; 36i; 36h) and right (38b) knee braces 38i, 38h) spaced apart in said folded position and brought together in said unfolded position, characterized in that it comprises unfolding means (74b; 74i; 74h) tending to bring said left knee braces (36b; 36h) and right (38b; 38i; 38h).   2. Support according to claim 1, characterized in that said unfolding means comprise an elastic (74b; 74i; 74h).   3. Support according to any one of claims 1 and 2, characterized in that said unfolding means (74b; 74i; 74h) are fixed on pins (56b, 58b; 56i, 58i; 56h, 58h) of said knee pads left (36b, 36i, 36h) and right (38b, 38i, 38h).   4. Support according to any one of claims 2 and 3, characterized in that it comprises an elastic (74b; 74i; 74h) forming a closed loop wound around said axes (56b, 58b; 56i, 58i; 56h, 58h) of said left (36b; 36i; 36h) and right (38b; 38i; 38h) kneepads.   5. Support according to any one of the preceding claims, characterized in that it comprises folding means tending to bring said continuous (32b; 32i; 32h) and lower (34b; 34i; 34h) knee braces together.   6. Support according to claim 5, characterized in that said folding means are shaped to compensate for the action of said unfolding means (74b; 74i; 74h).   7. Support according to any one of the preceding claims, characterized in that it comprises locking means (80,86) in said unfolded position, latching on their own when said support reaches said unfolded position.   8. Support according to any one of the preceding claims, characterized in that said upper toggle (32b; 32i) comprises two branches (40i, 42i, 40b, 42b) hinged about an upper toggle axis (52b; 52i; ) and extending on the other side of said upper toggle axis (52b; 52i) to form two legs (46h, 44h; 46i, 44i) of a lower toggle (34h; 34i) of a second parallelogram structure ( 30h; 30i) of said support.   9. Support according to any one of the preceding claims, characterized in that said folding means comprise at least one drum (5) mounted to rotate axially about a winding axis (T) on a base (60) of said support, a web (3) fixed on the one hand on said drum (5) and on the other hand on said upper end (70) of said support, and elastic means 15 for winding said web (3) around said drum (5).   10. Support according to claim 9, characterized in that it comprises pawl means comprising a lever (80) integral with said base (60) and in permanent resilient support on a winding surface (14) of said drum (5). ), said winding surface (14) having a housing (86) or projection in which said lever (80) can snap.   11. Support according to claim 10, characterized in that said web (3) is fixed on said drum (5) so as to cover said housing (86) or said projection until said support has reached a position in which said web (3) is substantially completely unrolled.   12. Support according to any one of the preceding claims, characterized in that it comprises a trunk (6) receiving said structure in said folded position.   13. Support according to any one of the preceding claims, characterized in that said parallelogram structure is a diamond structure.   14. Use of a support according to any one of the preceding claims in an information presentation device, a blind, an awning or a cabin.