WO2005012782A2 - Variable geometry support with parallelogram structure - Google Patents

Variable geometry support with parallelogram structure Download PDF

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Publication number
WO2005012782A2
WO2005012782A2 PCT/FR2004/002059 FR2004002059W WO2005012782A2 WO 2005012782 A2 WO2005012782 A2 WO 2005012782A2 FR 2004002059 W FR2004002059 W FR 2004002059W WO 2005012782 A2 WO2005012782 A2 WO 2005012782A2
Authority
WO
WIPO (PCT)
Prior art keywords
support
drum
support according
ply
elastic
Prior art date
Application number
PCT/FR2004/002059
Other languages
French (fr)
Other versions
WO2005012782A3 (en
Inventor
Guy Doat
Original Assignee
Guy Doat
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guy Doat filed Critical Guy Doat
Publication of WO2005012782A2 publication Critical patent/WO2005012782A2/en
Publication of WO2005012782A3 publication Critical patent/WO2005012782A3/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
    • G09F15/0006—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels
    • G09F15/0056—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels portable display standards
    • G09F15/0062—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels portable display standards collapsible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/20—Undercarriages with or without wheels
    • F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
    • F16M11/38—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by folding, e.g. pivoting or scissors tong mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/005—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles integral with the apparatus or articles to be supported
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00—Details of stands or supports
    • F16M2200/06—Arms
    • F16M2200/061—Scissors arms

Definitions

  • the invention relates to a variable geometry support movable between folded and unfolded positions in which the upper and lower ends of said support are brought closer and apart, respectively, comprising at least one articulated parallelogram structure comprising opposite upper and lower knee pads, close together in said folded position and spread apart in said unfolded position, and opposite left and right knee pads, spread apart in said folded position and close together in said unfolded position.
  • the invention also relates to the use of such a support, in particular for an information presentation device.
  • an information presentation device comprises a sheet capable of carrying information, a hollow drum for winding this sheet mounted for rotation about its longitudinal axis on a base, and means for automatically winding the ply around this drum.
  • a device makes it possible to wrap around the drum a flexible tablecloth of large dimensions on which are, for example, fixed or printed images, to be easily transported, without creasing it, in a living room or an exhibition, then to unroll it to present these images.
  • the unwound tablecloth is stretched between the drum to which its lower edge is fixed, and an upper fixing point of a support, for example a hook disposed in the upper part of a bracket, to which the upper edge of the tablecloth is attached .
  • a support for example a hook disposed in the upper part of a bracket, to which the upper edge of the tablecloth is attached .
  • the bracket is in the form of a telescopic mast or is formed by assembling a plurality of elements which fit together.
  • the mounting of these brackets is often complex and long, especially if the number of elements to be assembled is high.
  • the object of the present invention is to provide a new type of support, capable of replacing the brackets according to the prior art, but easy and quick to assemble.
  • this object is achieved by means of a support with variable geometry movable between folded and unfolded positions in which the upper and lower ends of said support are brought closer and apart, respectively, comprising at least one articulated parallelogram structure comprising knee pads upper and lower opposite, close together in said folded position and separated in said unfolded position, and opposite left and right knee pads, separated in said folded position and brought together in said unfolded position.
  • this support is remarkable in that it comprises unfolding means tending to permanently bring said left and right knee pads closer.
  • the action of bringing the left and right knee bridges together by the unfolding means advantageously allows the parallelogram structure to unfold to the unfolded position in a simple and rapid manner .
  • said unfolding means comprise an elastic which, advantageously does not rust, is inexpensive, and avoids any risk of pinching;
  • said support comprises an elastic forming a closed loop wrapped around said axes of said left and right knee pads, which advantageously simplifies assembly and therefore limits manufacturing costs;
  • - Said support comprises folding means tending to permanently bring said upper and lower knee pads, 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 so as to extend substantially in a vertical plane, is in static equilibrium, which, advantageously, allows the support to be positioned simply in substantially any intermediate position between the unfolded and folded positions;
  • said support includes locking means in said unfolded position, engaging themselves when said support reaches said unfolded position, which advantageously allows automatic detection, that is to say without voluntary intervention by the user for this specific purpose, from the unfolded position, and an automatic blocking in this position;
  • Said upper toggle joint comprises two branches articulated around an axis of upper knee joint and extending on the other side of said axis of upper knee joint to form two branches of a lower knee joint of another structure in parallelogram, which, advantageously , allows to couple several structures in parallelogram 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 about a winding axis on a base of said support, a ply fixed on the one hand to said drum and on the other hand to said upper end of said support, and elastic means for winding said ply around said drum;
  • ratchet means comprising a lever integral with said base and in permanent elastic support on a winding surface of said drum, said winding surface comprising a housing or a projection in which said lever can snap;
  • - 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 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 characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which - Figures 1 and 2 show an information presentation device incorporating a support according to the invention in a folded position;
  • FIGS. 3 and 4 show 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;
  • FIG. 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 analogous members.
  • the description below of the drawings assumes that the presentation device according to the invention is placed flat on a horizontal plane, in a position allowing the vertical unwinding and winding of the sheet.
  • the presentation device could also be arranged so that the sheet takes place in other directions, in particular under the trunk or, in particular in the case where the trunk would be arranged vertically, parallel to the ground. Referring now to Figures 1 to 5.
  • a presentation device 1 comprises a flexible sheet 3, for example rectangular, (see Figure 5), for example of plastic, on which can be printed or fixed images or information , a drum 5 for winding the ply 3, hollow and rotatably mounted about its longitudinal axis, or winding axis T, in a protective box 6, winding means, not shown, being arranged at the 'interior of the drum 5.
  • the sheet 3 is only shown in Figure 5, partially.
  • one or more feet 7 are fixed on the trunk 6 to ensure the stability of the presentation device 1 on the ground.
  • the lower edge of the ply 3 is preferably directly fixed, preferably removably, on a first edge of a flexible primer not shown, for example by means of a VELCRO® type fixing, of a zipper or glue.
  • a second edge of the primer, opposite the first edge, is fixed on a winding surface 14 of the drum 5, that is to say on the outer surface, substantially cylindrical, of the drum 5 on which the ply 3 and the primer can be wound.
  • the primer is unrollable so that its first edge can extend outside the trunk 6 when it is fully unrolled.
  • An upper edge 9 of the sheet 3, opposite the lower edge, is preferably fixed to an upper strip 11.
  • the upper strip 11 is preferably removably mounted on a reinforcing bar 12.
  • the upper strip 11 has a bead longitudinal
  • the elongated protective box 6 is split with a longitudinal opening 17, opening out substantially vertically, through which the sheet 3 and a support 20 according to the invention can be deployed.
  • the trunk 6 comprises a rear flange, not shown to leave the interior of the trunk visible, arranged so that, in the unfolded position of the support 20, only the opening 17 allows access to the interior of the trunk 6.
  • the trunk 6 is closed by lateral flanges 21.
  • the reinforcing bar 12 is shaped so that, in the folded position, bear on an edge 22 of the opening 17 so that it cannot penetrate the inside the trunk 6 under the effect of the winding means arranged inside the drum 5.
  • the reinforcing bar 12 is also shaped so as to close, in the folded position of the support (see FIG. 7) , the opening 17.
  • the sheet 3 In the folded position of the support, the sheet 3 is completely wound around the drum 5, the box 6 enclosing and protecting the sheet 3 and the support 20.
  • the support 20 includes first, second and third diamond structures, or "diamonds", called high structures 30h, intermediate 30i, and low 30b, respectively, similar, superimposed, and able to extend in a substantially vertical plane V.
  • a diamond structure 30h, 30i and 30b has upper knee pads 32h, 32i and 32b and lower 34h, 34i and 34b and left knee pads 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 one another to form the lower toggle 34h, 34i and 34b.
  • the first upper and lower branches are rotatably mounted one on the other to form the left knee brace 36h, 36i and 36b.
  • the second upper and lower branches are rotatably mounted one on the other to form the right toggle 38h, 38i and 38b.
  • Axes 52h, 52i, 52b, 54h, 54i, 54b, 56h, 56i, 56b, 58h, 58i and 58b 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 deployment of the support 20.
  • the axis 54b of the lower toggle 34b of the bottom diamond 30b is fixed to a base 60 of the trunk 6 (see FIG. 6).
  • the axis 52h of the upper toggle joint 32h of the high rhombus 30h is fixed on the reinforcement bar 12 (see FIG. 5).
  • the lower toggle 34h of the upper diamond 30h and the upper toggle 32i of the intermediate diamond 30i two bars 62 and 64 are rotatably mounted one on the other along the axis 52i passing substantially in their middle , thus forming a high articulated cross, the first bar 62 defining the first lower branch 44h of the high rhombus 30h and the second upper branch 42i of the intermediate rhombus 30i, the second bar 64 defining the second lower branch 46h of the high rhombus 30h and the first plugged upper 40i of the intermediate diamond 30i.
  • the axis 54h of the lower toggle 34h of the upper diamond 30h is it coincident with the axis 52i of the upper toggle 32i of the intermediate diamond 30i.
  • two bars 66 and 68 are rotatably mounted one on the other along the axis 52b passing substantially in the middle, thus forming a low articulated cross, the first bar 66 defining the first lower branch 44i of the intermediate rhombus 30i and the second upper branch 42b of the low 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 bottom diamond 30b.
  • the axis 54i of the lower toggle 34i of the intermediate diamond 30i is coincident with the axis 52b of the upper toggle 32b of the bottom diamond 30b.
  • the structure described above therefore forms an articulated trellis capable of deploying in a plane, from a folded position in which the trellis is stored in the trunk 6 ( Figures 1 and 2) to an unfolded position.
  • the diamond structure allows a spacing or a bringing together in translation of the upper 70 and lower 72 ends of the support 20 relative to one another when the geometry of the support 20 according to the invention is modified.
  • an elastic 74h, 74i and 74b is stretched between the axes of the left and right knee pads, 36h and 38h, 36i and 38i, and 36b and 38b, diamonds 30h, 30i and 30b, respectively, thus tending to bring the left and right knee pads closer to the diamonds 30h, 30i and 30b, and therefore to deploy the support 20.
  • the length of the elastic is determined so that, whatever the position of the support 20 between the folded and unfolded positions , the consequences of the elongation of the elastic are never irreversible.
  • the unfolding means tending to bring the left and right knee pads permanently closer are not limited to elastic bands. For example, springs or cylinders could also be used.
  • an elastic 74h, 74i and 74b is inexpensive and safe. Unlike a spring, an elastic prevents any risk of pinching, does not rust, and is easy to install. In addition, an elastic band is advantageously more reliable, any seizure being excluded, and less costly than a jack.
  • the elastic 74h, 74i and 74b is formed in a closed loop, and wound as shown in Figure 5, around the axes of the left and right knee pads.
  • a second elastic 76 shown hatched in FIG.
  • the tension of the elastic bands 74h, 74i and 74b, the friction of the different bars of the support 20 between them at their joints, and the force exerted by the winding means on the ply 3, are determined , by a person skilled in the art, so as to obtain a static balance of the ply 3 in a wide range of positions between the folded position and the unfolded position.
  • the range of equilibrium positions includes all the positions entered at a low limit corresponding to a minimum unfolding of the support, for example after unfolding of about fifty centimeters of the sheet 3, and the unfolded position.
  • the information presentation device includes means, not shown, for blocking in the unfolded position of the support 20.
  • the unfolded position is thus stable and is not likely to be modified for example by an inappropriate action.
  • the locking means are automatic, that is to say that they engage themselves when the support 20 reaches the unfolded position.
  • 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, for example a spring 82, symbolized in FIG. 9, tending to push in the direction F (see FIG. 9) a bearing part 84 of the lever 80 on the winding surface 14 of the drum 5.
  • a housing 86 is provided at least opposite the support part 84 of the lever 80, so that the support part 84 can snap into the housing 86 under the action of the spring 82.
  • the housing 86 is shaped so that after engagement of the support part 84, the rotation of the drum 5 about its axis T is only blocked in the direction of the winding E (see figure 7).
  • the spring 82, the lever 80, and the housing 86 thus constitute ratchet means.
  • the housing 86 is arranged so as to be covered by the primer and / or the ply 3 when the latter are, at least in part, wound on the drum 5.
  • the lever 80 comprises, on the opposite side at its axis of rotation P relative to the support part 84, a control part 88 by which a user can disengage the support part 84 from the housing 86.
  • the operation of the information presentation device is as follows .
  • the support 20 In a stored 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 diamonds 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 knee pads are spaced from each other.
  • the ply 3 is also in the trunk 6, completely wound around the drum 5.
  • the reinforcing bar 12 substantially seals the entire opening 17.
  • the trunk and the reinforcing bar 12 therefore define a substantially closed housing.
  • the user After placing the trunk 6 on the ground and possibly deploying the feet 7, pulls substantially vertically on the reinforcement bar 12.
  • the action of the user is favored by the action of the elastic bands 74h, 74i and 74b, and counteracted by the action of the winding means of the drum 5.
  • the action of the elastic bands 74h, 74i and 74b being substantially equal and opposite to that of the winding means, l the user advantageously encounters no difficulty in lifting the reinforcement bar 12.
  • the upper 70 and lower 72 ends move away from one another, while remaining aligned in the vertical.
  • the left and right knee pads of each diamond are close to each other.
  • Elastics 74h, 74i and 74b relax. After crossing the lower limit of the range of equilibrium positions, the reinforcement bar 12 remains in equilibrium after the user has released it.
  • the unfolding can be stopped at any time in a partially unfolded or “intermediate” position or can be continued until the unfolded position of the support 20.
  • the unfolded position can be defined by the end of the unwinding of the ply 3, the fixing of the ply 3 on the drum 5 then preventing any further separation of (a 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 efficiency of the elastic 74h, 74i and 74b resulting from their relaxation.In the latter situation, any additional elevation of the reinforcing bar 12 au- beyond the unfolded position in fact leads to a position in which the action of the winding means exceeds that of the elastic bands.
  • the reinforcement bar 12 therefore moves towards the unfolded position as soon as the user releases its force upwards on the reinforcement bar 12.
  • the unfolded position is then the last position upwards where the action of the winding means and that of elastic bands 74h, 74i and 74b offset each other.
  • the height of the support 20 is not limited by the size of the user, the elevation of the reinforcement bar 12 being able to be extended by an action of the user on the diamonds arranged in the lower part of the support 20.
  • the support according to the invention therefore allows sheets to be easily extended over great heights while ensuring very high stability.
  • the user can continue unfolding the support 20 to the unfolded position.
  • the blocking means engage when the support 20 reaches the unfolded position and prevent any involuntary folding of the support 20.
  • the locking means are however optional, the support 20 remaining in equilibrium in the unfolded position.
  • the diamond structure of the support 20 gives very great stability to the information presentation device.
  • the user acts on the reinforcing bar 12, the ply 3 or the bars forming the diamond structures of the support 20 to bring the reinforcement bar 12 down.
  • the elastic bands 74h, 74i and 74b stretched between the right and left knee pads of the diamond structures avoid sudden and immediate winding of the ply 3 around the drum 5. Due to the compensation of the forces exerted by the elastic bands 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 sheet 3, the user unrolls it substantially completely until the support portion 84 engages in the housing 86.
  • the housing 86 remains covered by the assembly formed by the sheet 3 and the primer, therefore inoperative , until the last turn of the drum 5 before complete unwinding. Substantially up to the fully unrolled position of the ply 3, it is therefore possible, at any time, to wind or uncoil the ply 3 freely. During the last turn, the housing 86 is uncovered. Passing in front of the lever 80, the latter then engages, under the effect of the spring 82, in the housing 86, making any subsequent winding of the ply 3 impossible without user intervention on the control part 88. L the primer is then taken out of the trunk 6.
  • a 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 part 84 of the housing 86 by pressing the control part 88 of the lever, which allows the rotation of the drum 5 in the winding direction E.
  • the drum 5 performs a first winding turn on itself during which the replacement ply or the primer covers the housing 86.
  • the user can then relax his action on the part of support 84, and continue winding the replacement ply around the drum 5 to the folded position of the support 20.
  • the support 20 according to the invention allows mounting and dismounting of the device according to the invention very ra pide, and low cost.
  • the support according to the invention is not limited to the support described and shown.
  • the support according to the invention could in particular include any number of diamonds, for example comprising only one diamond.
  • the support according to the invention could also be used for stretching awnings, blinds, or any other device requiring the deployment and tensioning of a sheet.
  • the winding, in the folded position, of a ply 3 around a drum is not a limiting constraint.
  • the tablecloth resting, for example wound on itself, in bulk or folded, in the folded position of the support
  • the lower edge of the tablecloth is fixed on a lower reinforcement bar 80 secured to the foot 7
  • the elastic bands serve therefore not only means for unfolding the support, but also means for tensioning the ply 3 in the unfolded position of the support.
  • 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 layers can advantageously be arranged on either side of the same support according to the invention.
  • the device according to the invention it is also possible to produce objects of various shapes.
  • a plurality of supports according to the invention can be used, the reinforcement bars of which would be connected to one another, so as to form, in the unfolded position, a column or a cabin.
  • 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.
  • two presentation devices according to the invention as described in Figures 1 to 9, by placing them one next to the other so that by unfolding the supports of these devices, one unwinds two layers hiding said supports.
  • the number of diamonds provided with an elastic is not limiting. For example, only the 30h high diamond could be fitted with it.

Abstract

The invention concerns a variable geometry support mobile between folded and extended positions wherein the upper (70) and lower (72) ends of the support are brought together and spaced apart, respectively, comprising at least one articulated parallelogram structure (30b; 30i; 30h) including opposite upper (32b; 32i; 32h) and lower (34b; 34i; 34h) toggle joints, brought together in said folded position and spaced apart in said extended position, and opposite left (36b; 36i; 36h) and right (38b; 38i; 38h) toggle joints, spaced apart in said folded position and brought together in said extended position. The inventive support is characterized in that it comprises extending means (74b; 74i; 74h) constantly tending to bring together the left (36b; 36i; 36h) and right (38b; 38i; 38h) toggle joints.

Description

Support à géométrie variable à structure en parallélogramme L'invention se rapporte à un support à géométrie variable mobile entre des positions repliée et dépliée dans lesquelles des extrémités supérieure et inférieure dudit support sont rapprochées et écartées, respectivement, comportant au moins une structure en parallélogramme articulé comportant des genouillères supérieure et inférieure opposées, rapprochées dans ladite position repliée et écartées dans ladite position dépliée, et des genouillères gauche et droite opposées, écartées dans ladite position repliée et rapprochées dans ladite position dépliée. L'invention se rapporte également à l'utilisation d'un tel support, notamment pour un dispositif de présentation d'informations. Classiquement, comme décrit dans la demande de brevet en France N° 01/03170 déposée le 8 mars 2001 par la Demanderesse, un dispositif de présentation d'informations comprend une nappe susceptible de porter des informations, un tambour creux d'enroulement de cette nappe monté à rotation autour de son axe longitudinal sur une embase, et des moyens d'enroulement automatique de la nappe autour, de ce tambour. Un tel dispositif permet d'enrouler autour du tambour une nappe souple de grandes dimensions sur laquelle sont, par exemple, fixées ou imprimées des images, de fa transporter facilement, sans la froisser, dans un salon ou une exposition, puis de la dérouler pour présenter ces images. Classiquement, la nappe déroulée est tendue entre le tambour auquel son bord inférieur est fixé, et un point de fixation supérieur d'un support, par exemple un crochet disposé en partie haute d'une potence, auquel le bord supérieur de la nappe est accroché. Généralement, la potence se présente sous la forme d'un mât télescopique ou est formée par assemblage d'une pluralité d'éléments emboîtables les uns dans les autres. Le montage de ces potences est souvent complexe et long, notamment si le nombre d'éléments à assembler est élevé. Le but de la présente invention est de fournir un nouveau type de support, susceptible de se substituer aux potences selon la technique antérieure, mais facile et rapide à monter. On atteint ce but au moyen d'un support à géométrie variable mobile entre des positions repliée et dépliée dans lesquelles des extrémités supérieure et inférieure dudit support sont rapprochées et écartées, respectivement, comportant au moins une structure en parallélogramme articulé comportant des genouillères supérieure et inférieure opposées, rapprochées dans ladite position repliée et écartées dans ladite position dépliée, et des genouillères gauche et droite opposées, écartées dans ladite position repliée et rapprochées dans ladite position dépliée. Selon l'invention, ce support est remarquable en ce qu'il comporte des moyens de dépliement tendant à rapprocher en permanence lesdites genouillères gauche et droite. Comme on le verra plus en détail dans la suite de la description, l'action de rapprochement des genouillères gauche et droite par les moyens de dépliement permet avantageusement à la structure en parallélogramme de se déplier jusqu'à la position dépliée de manière simple et rapide. Selon d'autres caractéristiques préférentielles de l'invention,The invention relates to a variable geometry support movable between folded and unfolded positions in which the upper and lower ends of said support are brought closer and apart, respectively, comprising at least one articulated parallelogram structure comprising opposite upper and lower knee pads, close together in said folded position and spread apart in said unfolded position, and opposite left and right knee pads, spread apart in said folded position and close together in said unfolded position. The invention also relates to the use of such a support, in particular for an information presentation device. Conventionally, as described in the patent application in France N ° 01/03170 filed on March 8, 2001 by the Applicant, an information presentation device comprises a sheet capable of carrying information, a hollow drum for winding this sheet mounted for rotation about its longitudinal axis on a base, and means for automatically winding the ply around this drum. Such a device makes it possible to wrap around the drum a flexible tablecloth of large dimensions on which are, for example, fixed or printed images, to be easily transported, without creasing it, in a living room or an exhibition, then to unroll it to present these images. Conventionally, the unwound tablecloth is stretched between the drum to which its lower edge is fixed, and an upper fixing point of a support, for example a hook disposed in the upper part of a bracket, to which the upper edge of the tablecloth is attached . Generally, the bracket is in the form of a telescopic mast or is formed by assembling a plurality of elements which fit together. The mounting of these brackets is often complex and long, especially if the number of elements to be assembled is high. The object of the present invention is to provide a new type of support, capable of replacing the brackets according to the prior art, but easy and quick to assemble. This object is achieved by means of a support with variable geometry movable between folded and unfolded positions in which the upper and lower ends of said support are brought closer and apart, respectively, comprising at least one articulated parallelogram structure comprising knee pads upper and lower opposite, close together in said folded position and separated in said unfolded position, and opposite left and right knee pads, separated 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 permanently bring said left and right knee pads closer. As will be seen in more detail in the following description, the action of bringing the left and right knee bridges together by the unfolding means advantageously allows the parallelogram structure to unfold to the unfolded position in a simple and rapid manner . According to other preferred characteristics of the invention,
- lesdits moyens de dépliement comportent un élastique qui, avantageusement ne rouille pas, est bon marché, et évite tout risque de pincement ;- Said unfolding means comprise an elastic which, advantageously does not rust, is inexpensive, and avoids any risk of pinching;
- lesdits moyens de dépliement sont fixés sur des axes desdites genouillères gauche et droite, ce qui, avantageusement, optimise l'efficacité de leur action ;- Said unfolding means are fixed on axes of said left and right knee pads, which advantageously optimizes the effectiveness of their action;
- ledit support comporte un élastique formant une boucle fermée enroulée autour desdits axes desdites genouillères gauche et droite, ce qui, avantageusement, simplifie le montage et donc limite les coûts de fabrication ;- Said support comprises an elastic forming a closed loop wrapped around said axes of said left and right knee pads, which advantageously simplifies assembly and therefore limits manufacturing costs;
- ledit support comporte des moyens de repliement tendant à rapprocher en permanence lesdites genouillères supérieure et inférieure, ce qui, avantageusement, limite l'effort de l'utilisateur pour opérer le repliement du support ;- Said support comprises folding means tending to permanently bring said upper and lower knee pads, which, advantageously, limits the effort of the user to operate the folding of the support;
- lesdits moyens de repliement sont conformés pour compenser l'action desdits moyens de dépliement, de manière que ledit support, par exemple lorsqu'il est disposé de manière à s'étendre sensiblement selon un plan vertical, soit en équilibre statique, ce qui, avantageusement, permet de positionner simplement le support sensiblement dans n'importe quelle position intermédiaire entre les positions dépliée et repliée ;- said folding means are shaped to compensate for the action of said unfolding means, so that said support, for example when it is arranged so as to extend substantially in a vertical plane, is in static equilibrium, which, advantageously, allows the support to be positioned simply in substantially any intermediate position between the unfolded and folded positions;
- ledit support comporte des moyens de blocage dans ladite position dépliée, s'enclenchant d'eux-mêmes quand ledit support atteint ladite position dépliée, ce qui, avantageusement, permet une détection automatique, c'est-à-dire sans intervention volontaire de l'utilisateur à cet effet spécifique, de la position dépliée, et un blocage automatique dans cette position ;- Said support includes locking means in said unfolded position, engaging themselves when said support reaches said unfolded position, which advantageously allows automatic detection, that is to say without voluntary intervention by the user for this specific purpose, from the unfolded position, and an automatic blocking in this position;
- ladite genouillère supérieure comporte deux branches articulées autour d'un axe de genouillère supérieure et se prolongeant de l'autre côté dudit axe de genouillère supérieure pour former deux branches d'une genouillère inférieure d'une autre structure en parallélogramme, ce qui, avantageusement, permet de coupler plusieurs structures en parallélogramme l'une au-dessus de l'autre de manière à augmenter la hauteur maximale du support dans la position dépliée, sans augmenter sa longueur L dans la position repliée ;- Said upper toggle joint comprises two branches articulated around an axis of upper knee joint and extending on the other side of said axis of upper knee joint to form two branches of a lower knee joint of another structure in parallelogram, which, advantageously , allows to couple several structures in parallelogram 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;
- lesdits moyens de repliement comportent au moins un tambour monté à rotation axiale autour d'un axe d'enroulement sur une embase dudit support, une nappe fixée d'une part sur ledit tambour et d'autre part sur ladite extrémité supérieure dudit support, et des moyens élastiques d'enroulement de ladite nappe autour dudit tambour ;said folding means comprise at least one drum mounted for axial rotation about a winding axis on a base of said support, a ply fixed on the one hand to said drum and on the other hand to said upper end of said support, and elastic means for winding said ply around said drum;
- ledit support comporte des moyens de cliquet comprenant un levier solidaire de ladite embase et en appui éfastique permanent sur une surface d'enroulement dudit tambour, ladite surface d'enroulement comportant un logement ou une saillie dans lequel ledit levier peut s'encliqueter ;- Said support comprises ratchet means comprising a lever integral with said base and in permanent elastic support on a winding surface of said drum, said winding surface comprising a housing or a projection in which said lever can snap;
- ladite nappe est fixée sur ledit tambour de manière à recouvrir ledit logement ou ladite saillie tant que ledit support n'a pas atteint une position dans laquelle ladite nappe est sensiblement complètement déroulée, ce qui, avantageusement, permet au levier de ne pouvoir s'encliqueter dans le logement ou la saillie que lorsque la nappe est complètement déroulée ;- 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 the projection only when the tablecloth is completely unwound;
- ledit support comporte un coffre recevant ladite structure dans ladite position repliée, ce qui avantageusement permet de ranger le support afin de faciliter sa manipulation et son transport ;- 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 transport;
- ladite structure en parallélogramme est une structure en losange. L'invention concerne également l'utilisation d'un support selon l'invention dans un dispositif de présentation d'informations, un store, ou un auvent. D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel - les figures 1 et 2 représentent un dispositif de présentation d'information incorporant un support selon l'invention dans une position repliée ;- 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 characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which - Figures 1 and 2 show an information presentation device incorporating a support according to the invention in a folded position;
- les figures 3 et 4 représentent des vues en perspective d'un dispositif de présentation d'informations incorporant un support selon l'invention dans une position intermédiaire entre la position repliée et une position dépliée ;- Figures 3 and 4 show 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;
- les figures 5 et 6 représentent des vues de détail du dispositif de présentation d'informations des figures 3 et 4 ;- Figures 5 and 6 show detailed views of the information presentation device of Figures 3 and 4;
- les figures 7 à 9 représentent des vues de détail de moyens de cliquet utilisables sur les dispositifs de présentation d'informations des figures 1 à 6 ;- Figures 7 to 9 show detailed views of pawl means usable on the information presentation devices of Figures 1 to 6;
- la figure 10 représente une vue en perspective d'un autre dispositif de présentation d'informations incorporant un support selon l'invention dans une position dépliée. Des références identiques sont utilisées dans les différentes figures pour désigner des organes identiques ou analogues. La description ci-dessous des dessins suppose que le dispositif de présentation selon l'invention est posé à plat sur un plan horizontal, dans une position permettant le déroulement et l'enroulement verticaux de la nappe. Bien entendu, le dispositif de présentation pourrait également être disposé de manière que la nappe se déroule dans d'autres directions, notamment sous le coffre ou, en particulier dans le cas où le coffre serait disposé verticalement, parallèlement au sol. On se reporte à présent aux figures 1 à 5. Un dispositif de présentation 1 comporte une nappe 3 souple, par exemple rectangulaire, (voir figure 5), par exemple en matière plastique, sur laquelle peuvent être imprimées ou fixées des images ou des informations, un tambour 5 d'enroulement de la nappe 3, creux et monté à rotation autour de son axe longitudinal, ou axe d'enroulement T, dans un coffre 6 de protection, des moyens d'enroulement, non représentés, étant disposés à l'intérieur du tambour 5. Par souci de clarté des figures, la nappe 3 n'est que représentée sur la figure 5, partiellement. De préférence, un ou plusieurs pieds 7 sont fixés sur le coffre 6 pour assurer la stabilité du dispositif de présentation 1 sur le sol. Le bord inférieur de la nappe 3 est de préférence directement fixé, de préférence de manière amovible, sur un premier bord d'une amorce souple non représentée, par exemple au moyen d'une fixation de type VELCRO®, d'une fermeture à glissière ou de colle. Un deuxième bord de l'amorce, opposé au premier bord, est fixé sur une surface d'enroulement 14 du tambour 5, c'est-à-dire sur la surface extérieure, sensiblement cylindrique, du tambour 5 sur laquelle la nappe 3 et l'amorce peuvent s'enrouler. L'amorce est déroulable de manière que son premier bord puisse s'étendre à l'exté ieur du coffre 6 lorsqu'elle est totalement déroulée. Un bord supérieur 9 de la nappe 3, opposé au bord inférieur, est de préférence fixé à une baguette supérieure 11. La baguette supérieure 11 est de préférence montée amovible sur une barre de renfort 12. De préférence, la baguette supérieure 11 comporte un bourrelet longitudinal- 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 analogous members. The description below of the drawings assumes that the presentation device according to the invention is placed flat on a horizontal plane, in a position allowing the vertical unwinding and winding of the sheet. Of course, the presentation device could also be arranged so that the sheet takes place in other directions, in particular under the trunk or, in particular in the case where the trunk would be arranged vertically, parallel to the ground. Referring now to Figures 1 to 5. A presentation device 1 comprises a flexible sheet 3, for example rectangular, (see Figure 5), for example of plastic, on which can be printed or fixed images or information , a drum 5 for winding the ply 3, hollow and rotatably mounted about its longitudinal axis, or winding axis T, in a protective box 6, winding means, not shown, being arranged at the 'interior of the drum 5. For the sake of clarity of the figures, the sheet 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 ground. The lower edge of the ply 3 is preferably directly fixed, preferably removably, on a first edge of a flexible primer not shown, for example by means of a VELCRO® type fixing, of a zipper or glue. A second edge of the primer, opposite the first edge, is fixed on a winding surface 14 of the drum 5, that is to say on the outer surface, substantially cylindrical, of the drum 5 on which the ply 3 and the primer can be wound. The primer is unrollable so that its first edge can extend outside the trunk 6 when it is fully unrolled. An upper edge 9 of the sheet 3, opposite the lower edge, is preferably fixed to an upper strip 11. The upper strip 11 is preferably removably mounted on a reinforcing bar 12. Preferably, the upper strip 11 has a bead longitudinal
15 fendu longitudinalement et épaulé de manière à pouvoir s'enclencher élastiquement dans une rainure 16 longitudinale complémentaire ménagée dans la barre de renfort 12 afin d'assurer à la fois le montage frontal de la baguette supérieure 11 et sa retenue par rapport à la barre de renfort 12. Le coffre 6 de protection, allongé, est fendu d'une ouverture longitudinale 17, débouchant sensiblement verticalement, par laquelle la nappe 3 et un support 20 selon l'invention peuvent se déployer. De préférence, le coffre 6 comprend un flasque arrière, non représenté pour laisser visible l'intérieur du coffre, disposé de manière que, dans la position dépliée du support 20, seule l'ouverture 17 permette d'accéder à l'intérieur du coffre 6. De préférence, le coffre 6 est fermé par des flasques latéraux 21. La barre de renfort 12 est conformée pour, dans la position repliée, prendre appui sur un bord 22 de l'ouverture 17 de manière à ne pas pouvoir pénétrer à l'intérieur du coffre 6 sous l'effet des moyens d'enroulement disposés à l'intérieur du tambour 5. De préférence, la barre de renfort 12 est également conformée de manière à obturer, dans la position repliée du support (voir figure 7), l'ouverture 17. Dans la position repliée du support, la nappe 3 est totalement enroulée autour du tambour 5, le coffre 6 renfermant et protégeant la nappe 3 et le support 20. Le support 20 comporte des première, deuxième et troisième structures en losange, ou « losanges », appelées structures haute 30h, intermédiaire 30i, et basse 30b, respectivement, similaires, superposées, et aptes à s'étendre dans un plan sensiblement vertical V. Dans la suite de la description, les indices h, i et b sont utilisés pour désigner des organes appartenant aux losanges haut 30h, intermédiaire 30i et bas 30b, respectivement. Une structure en losange 30h, 30i et 30b comporte des genouillères supérieure 32h, 32i et 32b et inférieure 34h, 34i et 34b et des genouillères gauche 36h, 36i et 36b et droite 38h, 38i et 38b, respectivement. Une structure en losange comporte des première 40h, 40i et 40b et deuxième 42h, 42i et 42b branches supérieures et des première 44h, 44i et 44b et deuxième 46h, 46i et 46b branches inférieures. Les première et deuxième branches supérieures d'un losange sont montées à rotation l'une sur l'autre pour former la genouillère supérieure 32h, 32i et 32b. Les première et deuxième branches inférieures d'un losange sont montées à rotation l'une sur l'autre pour former la genouillère inférieure 34h, 34i et 34b. Les premières branches supérieure et inférieure sont montées à rotation l'une sur l'autre pour former la genouillère gauche 36h, 36i et 36b. Enfin, les deuxième branches supérieure et inférieure sont montées à rotation l'une sur l'autre pour former la genouillère droite 38h, 38i et 38b. Les axes 52h, 52i, 52b, 54h, 54i, 54b, 56h, 56i, 56b, 58h, 58i et 58b des genouillères 32h, 32i, 32b, 34h, 34i, 34b, 36h, 36i, 36b, 38h, 38i et 38b sont parallèles et sensiblement perpendiculaires au plan vertical V de déploiement du support 20. L'axe 54b de la genouillère inférieure 34b du losange bas 30b est fixé sur une embase 60 du coffre 6 (voir figure 6). L'axe 52h de la genouillère supérieure 32h du losange haut 30h est fixé sur la barre de renfort 12 (voir figure 5). Pour former d'une part la genouillère inférieure 34h du losange haut 30h et la genouillère supérieure 32i du losange intermédiaire 30i, deux barres 62 et 64 sont montées à rotation l'une sur l'autre selon l'axe 52i passant sensiblement en leur milieu, formant ainsi une croix articulée haute, la première barre 62 définissant la première branche inférieure 44h du losange haut 30h et la deuxième branche supérieure 42i du losange intermédiaire 30i, la deuxième barre 64 définissant la deuxième branche inférieure 46h du losange haut 30h et la première branche supérieure 40i du losange intermédiaire 30i. Ainsi, l'axe 54h de la genouillère inférieure 34h du losange haut 30h est-il confondu avec l'axe 52i de la genouillère supérieure 32i du losange intermédiaire 30i. De même, pour former d'une part la genouillère inférieure 34i du losange intermédiaire 30i et la genouillère supérieure 32b du losange bas 30b, deux barres 66 et 68 sont montées à rotation l'une sur l'autre selon l'axe 52b passant sensiblement en leur milieu, formant ainsi une croix articulée basse, la première barre 66 définissant la première branche inférieure 44i du losange intermédiaire 30i et la deuxième branche supérieure 42b du losange bas 30b, la deuxième barre 68 définissant la deuxième branche inférieure 46i du losange intermédiaire 30i et la première branche supérieure 40b du losange bas 30b. Ainsi, l'axe 54i de la genouillère inférieure 34i du losange intermédiaire 30i est-il confondu avec l'axe 52b de la genouillère supérieure 32b du losange bas 30b. La structure décrite ci-dessus forme donc un treillis articulé apte à se déployer dans un plan, depuis une position repliée dans laquelle le treillis est rangé dans le coffre 6 (figures 1 et 2) jusqu'à une position dépliée. Avantageusement, la structure en losanges permet un écartement ou un rapprochement en translation des extrémités supérieure 70 et inférieure 72 du support 20 l'une par rapport à l'autre lors de la modification de la géométrie du support 20 selon l'invention. Selon l'invention, un élastique 74h, 74i et 74b, est tendu entre les axes des genouillères gauche et droite, 36h et 38h, 36i et 38i, et 36b et 38b, des losanges 30h, 30i et 30b, respectivement, tendant ainsi à rapprocher les genouillères gauche et droite des losanges 30h, 30i et 30b, et donc à déployer le support 20. De préférence, la longueur de l'élastique est déterminée pour que, quelle que soit la position du support 20 entre les positions repliée et dépliée, les conséquences de l'allongement de l'élastique ne soient jamais irréversibles. Les moyens de dépliement tendant à rapprocher en permanence les genouillères gauche et droite ne sont pas limités à des élastiques. Par exemple, des ressorts ou des vérins pourraient également être utilisés. Avantageusement, l'utilisation d'un élastique 74h, 74i et 74b est peu coûteuse et sûre. A la différence d'un ressort, un élastique évite tout risque de pincement, ne rouille pas, et est facile à installer. En outre, un élastique est avantageusement plus fiable, tout grippage étant exclu, et moins coûteux qu'un vérin. Pour faciliter l'installation de l'élastique, de préférence l'élastique 74h, 74i et 74b est formé en boucle fermée, et enroulé comme représenté sur la figure 5, autour des axes des genouillères gauche et droite. Un deuxième élastique 76, représenté hachuré sur la figure 5, peut être tendu parallèlement à l'élastique 74h, 74i et 74b entre les axes des genouillères gauche et droite, 36h et 38h, 36i et 38i, et 36b et 38b, des losanges 30h, 30i et 30b, respectivement, de l'autre côté du plan V de déploiement du support 20. L'action des élastiques, tendant à déplier le support 20, est contrecarrée par l'action des moyens d'enroulement de la nappe 3 sur le tambour 5. De préférence, la tension des élastiques 74h, 74i et 74b, les frottements des différentes barres du support 20 entre elles au niveau de leurs articulations, et la force exercée par les moyens d'enroulement sur la nappe 3, sont déterminés, par l'homme du métier, de manière à obtenir un équilibre statique de la nappe 3 dans une grande plage de positions entre la position repliée et la position dépliée. De préférence, la plage des positions d'équilibre comprend toutes les positions entré une limite basse correspondant à un dépliement minimal du support, par exemple après déroulement d'une cinquantaine de centimètres de la nappe 3, et la position dépliée. La compensation entre les forces exercées sur la nappe 3 par les moyens d'enroulement d'une part et par les élastiques 74h, 74i et 74b d'autre part peπnet un positionnement sans effort de la nappe 3 dans n'importe quelle position de la plage des positions d'équilibre du support 20. Avantageusement, dans la plage des positions d'équilibre du support 20, la nappe 3 reste donc en position dès que l'utilisateur cesse d'exercer un effort tendant à la dérouler ou à l'enrouler. Il est ainsi possible d'exposer une longueur variable de la nappe 3 sans moyens de blocage supplémentaires. De préférence, le dispositif de présentation d'informations comporte cependant des moyens, non représentés, de blocage dans la position dépliée du support 20. Avantageusement, la position dépliée est ainsi stable et ne risque pas d'être modifiée par exemple par une action inopportune d'un utilisateur tendant à enrouler la nappe 3. De préférence, les moyens de blocage sont automatiques, c'est-à-dire qu'ils s'enclenchent d'eux-mêmes quand le support 20 atteint la position dépliée. En outre, comme représenté sur les figures 7 à 9, le dispositif de présentation d'informations comporte de préférence un levier 80 monté à rotation sur l'embase 60 selon un axe P parallèle à l'axe T du tambour 5, et des moyens élastiques, par exemple un ressort 82, symbolisés sur la figure 9, tendant à pousser selon la direction F (voir figure 9) une partie d'appui 84 du levier 80 sur la surface d'enroulement 14 du tambour 5. Sur la surface d'enroulement 14, extérieure au tambour 5, un logement 86, ou une saillie, est ménagé au moins en regard de la partie d'appui 84 du levier 80, de manière que la partie d'appui 84 puisse s'encliqueter dans le logement 86 sous l'action du ressort 82. De préférence, le logement 86 est conformé pour qu'après engagement de la partie d'appui 84, la rotation du tambour 5 autour de son axe T ne soit bloquée que dans le sens de l'enroulement E (voir figure 7). Le ressort 82, le levier 80, et le logement 86, constituent ainsi des moyens de cliquet. De préférence, le logement 86 est disposé de manière à être recouvert par l'amorce et/ou la nappe 3 lorsque ces derniers sont, au moins en partie, enroulés sur le tambour 5. De préférence, le levier 80 comporte, du côté opposé à son axe de rotation P par rapport à la partie d'appui 84, une partie de commande 88 grâce à laquelle un utilisateur peut dégager la partie d'appui 84 du logement 86. Le fonctionnement du dispositif de présentation d'informations est le suivant. Dans une position rangée du dispositif de présentation d'informations, telle que représentée sur la figure 7, le support 20 est en position repliée, rangé dans le coffre 6, les losanges 30h, 30i et 30b de la structure étant repliés sur eux-mêmes de manière que leurs genouillères supérieure et inférieure soient adjacentes l'une à l'autre et leurs genouillères droite et gauche soient écartées l'une de l'autre. La nappe 3 est également dans le coffre 6, complètement enroulée autour du tambour 5. La barre de renfort 12 obture sensiblement toute l'ouverture 17. Dans cette position, le coffre et la barre de renfort 12 définissent donc un boîtier sensiblement fermé. Pour déplier le support 20 selon l'invention, l'utilisateur, après avoir posé sur le sol le coffre 6 et déployé éventuellement les pieds 7, tire sensiblement verticalement sur la barre de renfort 12. L'action de l'utilisateur est favorisée par l'action des élastiques 74h, 74i et 74b, et contrariée par l'action des moyens d'enroulement du tambour 5. L'action des élastiques 74h, 74i et 74b étant sensiblement égale et opposée à celte des moyens d'enroulement, l'utilisateur, avantageusement, ne rencontre aucune difficulté pour soulever la barre de renfort 12. Lors du dépliement, les extrémités supérieure 70 et inférieure 72 s'écartent l'une de l'autre, tout en restant alignées selon la verticale. Les genouillères gauche et droite de chaque losange se rapprochent l'une de l'autre. Les élastiques 74h, 74i et 74b se détendent. Après avoir franchi la limite basse de la plage des positions d'équilibre, la barre de renfort 12 reste en équilibre après que l'utilisateur l'a relâchée. Ainsi, dans la plage des positions d'équilibre, le dépliement peut-il être stoppé à tout instant dans une position partiellement dépliée ou « intermédiaire » ou être poursuivi jusqu'à la position dépliée du support 20. La position dépliée peut être définie par la fin du déroulement de la nappe 3, la fixation de la nappe 3 sur le tambour 5 empêchant alors tout écartement supplémentaire de (a barre de renfort 12 par rapport au tambour 5. La position dépliée peut encore être définie par des moyens de blocage s'enclenchant dans une position prédéterminée du support 20. La position dépliée peut enfin résulter de la perte d'efficacité des élastiques 74h, 74i et 74b résultant de leur détente. Dans cette dernière situation, toute élévation supplémentaire de la barre de renfort 12 au-delà de la position dépliée conduit en effet à une position dans laquelle l'action des moyens d'enroulement dépasse celle des élastiques. Les moyens d'enroulement ramènent donc la barre de renfort 12 vers la position dépliée dès que l'utilisateur relâche son effort vers le haut sur la barre de renfort 12. La position dépliée est alors la dernière position vers le haut où l'action des moyens d'enroulement et celle des élastiques 74h, 74i et 74b se compensent. Avantageusement, la hauteur du support 20 n'est pas limitée par la taille de l'utilisateur, l'élévation de la barre de renfort 12 pouvant se prolonger par une action de l'utilisateur sur les losanges disposés en partie basse du support 20. Le support selon l'invention permet donc d'étendre facilement des nappes sur de grandes hauteurs tout en assurant une très grande stabilité. L'utilisateur peut poursuivre le dépliement du support 20 jusqu'à la position dépliée. De préférence, les moyens de blocage s'enclenchent quand le support 20 atteint la position dépliée et empêchent tout repliement involontaire du support 20. Avantageusement, les moyens de blocage sont cependant optionnels, le support 20 restant en équilibre dans la position dépliée. Avantageusement, dans la position dépliée, la structure en losange du support 20 confère une très grande stabilité au dispositif de présentation d'informations. Pour de nouveau enrouler la nappe 3 autour du tambour 5, après avoir, le cas échéant, débloqué les moyens de blocage, l'utilisateur agit sur la barre de renfort 12, la nappe 3 ou les barres formant les structures en losange du support 20 pour ramener la barre de renfort 12 vers le bas. Avantageusement, les élastiques 74h, 74i et 74b tendus entre les genouillères droite et gauche des structures en losange, évitent un enroulement brutal et immédiat de la nappe 3 autour du tambour 5.. Du fait de la compensation des forces exercées par les élastiques 74h, 74i et 74b et par les moyens d'enroulement, l'utilisateur peut interrompre le repliement de la structure dans n'importe quelle position intermédiaire. Pour changer la nappe 3, l'utilisateur la déroule sensiblement complètement jusqu'à enclenchement de la partie d'appui 84 dans le logement 86. Le logement 86 reste recouvert par l'ensemble formé par la nappe 3 et l'amorce, donc inopérant, jusqu'au dernier tour du tambour 5 avant déroulement complet. Sensiblement jusqu'à la position totalement déroulée de la nappe 3, il est donc possible, à tout instant, d'enrouler ou de dérouler librement la nappe 3. Lors du dernier tour, le logement 86 se découvre. En passant devant le levier 80, ce dernier s'engage alors, sous l'effet du ressort 82, dans le logement 86, rendant impossible tout enroulement ultérieur de la nappe 3 sans intervention de l'utilisateur sur la partie de commande 88. L'amorce est alors sortie du coffre 6. L'utilisateur tire alors frontalement, c'est-à-dire sensiblement perpendiculairement au plan de la nappe 3, la baguette supérieure 11 hors de la rainure 16 de la barre de renfort 12. De même, il détache le bord inférieur de la nappe 3 de l'amorce. Pour solidariser le bord supérieur de la nappe de remplacement à la barre de renfort 12, l'utilisateur pousse frontalement la baguette supérieure de cette nappe dans la rainure 16 jusqu'à encliquetage du bourrelet 15. Pour solidariser le bord inférieur de la nappe de remplacement au tambour 5, l'utilisateur fixe le bord inférieur de la nappe de remplacement sur l'amorce, par exemple par collage. Avantageusement, grâce à l'amorce, (a nappe de remplacement peut ainsi être rendue solidaire du tambour 5 sans que l'utilisateur ait à intervenir à l'intérieur du coffre 6 pour la fixer directement sur la surface d'enroulement 14 du tambour 5. L'utilisateur dégage ensuite la partie 84 du logement 86 en appuyant sur la partie de commande 88 du levier, ce qui autorise la rotation du tambour 5 dans le sens de l'enroulement E. De préférence, dès que la partie d'appui 84 est dégagée du logement 86, le tambour 5 effectue sur lui-même un premier tour d'enroulement au cours duquel la nappe de remplacement ou l'amorce recouvre le logement 86. L'utilisateur peut alors relâcher son action sur la partie d'appui 84, et poursuivre l'enroulement de la nappe de remplacement autour du tambour 5 jusqu'à la position repliée du support 20. Comme cela apparaît clairement à présent, le support 20 selon l'invention permet un montage et un démontage du dispositif selon l'invention très rapide, et un coût faible. Bien entendu, le support selon l'invention n'est pas limité au support décrit et représenté. Le support selon l'invention pourrait notamment comporter un nombre de losanges quelconque, par exemple ne comporter qu'un seul losange. Le support selon l'invention pourrait être également utilisé pour tendre des auvents, des stores, ou tout autre dispositif nécessitant le déploiement et la mise sous tension d'une nappe. L'enroulement, dans la position repliée, de (a nappe 3 autour d'un tambour n'est pas une contrainte limitative. Ainsi, dans une variante de l'invention telle que représentée sur fa figure 10, aucun moyen d'enroulement de la nappe n'est prévu, la nappe reposant, par exemple enroulée sur elle-même, en vrac ou pliée, dans la position repliée du support. Le bord inférieur de la nappe est fixé sur une barre de renfort inférieure 80 solidaire du pied 7. Sous l'effet des élastiques tendus entre les genouillères droite et gauche, le support se déplie de lui-même, sans intervention de l'utilisateur, jusqu'à ce que la nappe 3 soit tendue entre les barres de renfort 12 et 80. Avantageusement, dans cette variante de l'invention, les élastiques servent donc non seulement de moyens de dépliement du support, mais aussi de moyens de mise sous tension de la nappe 3 dans la position dépliée du support. Avantageusement, un tel dispositif de présentation d'informations est peu coûteux, présente une bonne rigidité dans la position dépliée du support, et est compact dans la position repliée du support. Deux nappes peuvent avantageusement être disposées de part et d'autre d'un même support selon l'invention. Grâce au dispositif selon l'invention, il est également possible de réaliser des objets de formes diverses. Par exemple, on peut utiliser une pluralité de supports selon l'invention dont les barres de renfort seraient connectées les unes aux autres, de manière à former, dans la position dépliée, une colonne ou une cabine. Grâce au support selon l'invention, il est avantageusement possible de créer un objet délimité par une surface fermée, aucun accès direct au support n'étant nécessaire pour son dépliement. II est également possible de coupler deux dispositifs de présentation selon l'invention tels que décrits dans les figures 1 à 9, en les plaçant l'un à côté de l'autre de manière qu'en dépliant les supports de ces dispositifs, on déroule deux nappes cachant lesdits supports. Le nombre de losanges pourvus d'un élastique n'est pas limitatif. Par exemple seul le losange haut 30h pourrait en être équipé. 15 split longitudinally and shouldered so as to be able to engage elastically in a complementary longitudinal groove 16 formed in the reinforcement bar 12 in order to ensure both the front mounting of the upper strip 11 and its retention relative to the bar reinforcement 12. The elongated protective box 6 is split with a longitudinal opening 17, opening out substantially vertically, through which the sheet 3 and a support 20 according to the invention can be deployed. Preferably, the trunk 6 comprises a rear flange, not shown to leave the interior of the trunk visible, arranged so that, in the unfolded position of the support 20, only the opening 17 allows access to the interior of the trunk 6. Preferably, the trunk 6 is closed by lateral flanges 21. The reinforcing bar 12 is shaped so that, in the folded position, bear on an edge 22 of the opening 17 so that it cannot penetrate the inside the trunk 6 under the effect of the winding means arranged inside the drum 5. Preferably, the reinforcing 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 completely wound around the drum 5, the box 6 enclosing and protecting the sheet 3 and the support 20. The support 20 includes first, second and third diamond structures, or "diamonds", called high structures 30h, intermediate 30i, and low 30b, respectively, similar, superimposed, and able to extend in a substantially vertical plane V. In the following description, the indices h, i and b are used to designate members belonging to the diamonds high 30h, intermediate 30i and low 30b, respectively. A diamond structure 30h, 30i and 30b has upper knee pads 32h, 32i and 32b and lower 34h, 34i and 34b and left knee pads 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 one another to form the lower toggle 34h, 34i and 34b. The first upper and lower branches are rotatably mounted one on the other to form the left knee brace 36h, 36i and 36b. Finally, the second upper and lower branches are rotatably mounted one on the other to form the right toggle 38h, 38i and 38b. Axes 52h, 52i, 52b, 54h, 54i, 54b, 56h, 56i, 56b, 58h, 58i and 58b 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 deployment of the support 20. The axis 54b of the lower toggle 34b of the bottom diamond 30b is fixed to a base 60 of the trunk 6 (see FIG. 6). The axis 52h of the upper toggle joint 32h of the high rhombus 30h is fixed on the reinforcement bar 12 (see FIG. 5). To form on the one hand the lower toggle 34h of the upper diamond 30h and the upper toggle 32i of the intermediate diamond 30i, two bars 62 and 64 are rotatably mounted one on the other along the axis 52i passing substantially in their middle , thus forming a high articulated cross, the first bar 62 defining the first lower branch 44h of the high rhombus 30h and the second upper branch 42i of the intermediate rhombus 30i, the second bar 64 defining the second lower branch 46h of the high rhombus 30h and the first plugged upper 40i of the intermediate diamond 30i. Thus, the axis 54h of the lower toggle 34h of the upper diamond 30h is it coincident with the axis 52i of the upper toggle 32i of the intermediate diamond 30i. Similarly, to form on the one hand the lower toggle 34i of the intermediate diamond 30i and the upper toggle 32b of the lower diamond 30b, two bars 66 and 68 are rotatably mounted one on the other along the axis 52b passing substantially in the middle, thus forming a low articulated cross, the first bar 66 defining the first lower branch 44i of the intermediate rhombus 30i and the second upper branch 42b of the low 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 bottom diamond 30b. Thus, the axis 54i of the lower toggle 34i of the intermediate diamond 30i is coincident with the axis 52b of the upper toggle 32b of the bottom diamond 30b. The structure described above therefore forms an articulated trellis capable of deploying in a plane, from a folded position in which the trellis is stored in the trunk 6 (Figures 1 and 2) to an unfolded position. Advantageously, the diamond structure allows a spacing or a bringing together in translation of the upper 70 and lower 72 ends of the support 20 relative to one another when the geometry of the support 20 according to the invention is modified. According to the invention, an elastic 74h, 74i and 74b, is stretched between the axes of the left and right knee pads, 36h and 38h, 36i and 38i, and 36b and 38b, diamonds 30h, 30i and 30b, respectively, thus tending to bring the left and right knee pads closer to the diamonds 30h, 30i and 30b, and therefore to deploy 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 positions , the consequences of the elongation of the elastic are never irreversible. The unfolding means tending to bring the left and right knee pads permanently closer are not limited to elastic bands. For example, springs or cylinders could also be used. Advantageously, the use of an elastic 74h, 74i and 74b is inexpensive and safe. Unlike a spring, an elastic prevents any risk of pinching, does not rust, and is easy to install. In addition, an elastic band is advantageously more reliable, any seizure being excluded, and less costly 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, around the axes of the left and right knee pads. A second elastic 76, shown hatched in FIG. 5, can be stretched parallel to the elastic 74h, 74i and 74b between the axes of the left and right knee pads, 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 elastic bands, 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 different bars of the support 20 between them at their joints, and the force exerted by the winding means on the ply 3, are determined , by a person skilled in the art, so as to obtain a static balance of the ply 3 in a wide range of positions between the folded position and the unfolded position. Preferably, the range of equilibrium positions includes all the positions entered at a low limit corresponding to a minimum unfolding of the support, for example after unfolding of about fifty centimeters of the sheet 3, and the unfolded position. Compensation between the forces exerted on the ply 3 by the winding means on the one hand and by the elastic bands 74h, 74i and 74b on the other hand peπnet effortless positioning of the ply 3 in any position of the range of the equilibrium positions of the support 20. Advantageously, in the range of the equilibrium positions of the support 20, the ply 3 therefore remains in position as soon as the user ceases to exert an effort tending to unroll it or to wrap. It is thus possible to expose a variable length of the sheet 3 without additional locking means. Preferably, the information presentation device however includes means, not shown, for blocking in the unfolded position of the support 20. Advantageously, the unfolded position is thus stable and is not likely to be modified for example by an inappropriate action. of a user tending to wind the ply 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, for example a spring 82, symbolized in FIG. 9, tending to push in the direction F (see FIG. 9) a bearing part 84 of the lever 80 on the winding surface 14 of the drum 5. On the surface d winding 14, outside the drum 5, a housing 86, or a projection, is provided at least opposite the support part 84 of the lever 80, so that the support part 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 support part 84, the rotation of the drum 5 about its axis T is only blocked in the direction of the winding E (see figure 7). The spring 82, the lever 80, and the housing 86 thus constitute ratchet means. Preferably, the housing 86 is arranged so as to be covered by the primer and / or the ply 3 when the latter are, at least in part, wound on the drum 5. Preferably, the lever 80 comprises, on the opposite side at its axis of rotation P relative to the support part 84, a control part 88 by which a user can disengage the support part 84 from the housing 86. The operation of the information presentation device is as follows . In a stored 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 diamonds 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 knee pads are spaced from each other. The ply 3 is also in the trunk 6, completely wound around the drum 5. The reinforcing bar 12 substantially seals the entire opening 17. In this position, the trunk and the reinforcing bar 12 therefore define a substantially closed housing. To unfold the support 20 according to the invention, the user, after placing the trunk 6 on the ground and possibly deploying the feet 7, pulls substantially vertically on the reinforcement bar 12. The action of the user is favored by the action of the elastic bands 74h, 74i and 74b, and counteracted by the action of the winding means of the drum 5. The action of the elastic bands 74h, 74i and 74b being substantially equal and opposite to that of the winding means, l the user advantageously encounters no difficulty in lifting the reinforcement bar 12. During unfolding, the upper 70 and lower 72 ends move away from one another, while remaining aligned in the vertical. The left and right knee pads of each diamond are close to each other. Elastics 74h, 74i and 74b relax. After crossing the lower limit of the range of equilibrium positions, the reinforcement bar 12 remains in equilibrium after the user has released it. Thus, in the range of equilibrium positions, the unfolding can be stopped at any time in a partially unfolded or “intermediate” position or can be continued until the unfolded position of the support 20. The unfolded position can be defined by the end of the unwinding of the ply 3, the fixing of the ply 3 on the drum 5 then preventing any further separation of (a 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 efficiency of the elastic 74h, 74i and 74b resulting from their relaxation.In the latter situation, any additional elevation of the reinforcing bar 12 au- beyond the unfolded position in fact leads to a position in which the action of the winding means exceeds that of the elastic bands. The reinforcement bar 12 therefore moves towards the unfolded position as soon as the user releases its force upwards on the reinforcement bar 12. The unfolded position is then the last position upwards where the action of the winding means and that of elastic bands 74h, 74i and 74b offset each other. Advantageously, the height of the support 20 is not limited by the size of the user, the elevation of the reinforcement bar 12 being able to be extended by an action of the user on the diamonds arranged in the lower part of the support 20. The support according to the invention therefore allows sheets to be easily extended over great heights while ensuring very high stability. The user can continue unfolding the support 20 to the unfolded position. Preferably, the blocking means engage when the support 20 reaches the unfolded position and prevent 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 diamond structure of the support 20 gives very great stability to the information presentation device. To again wind the ply 3 around the drum 5, after having, if necessary, released the locking means, the user acts on the reinforcing bar 12, the ply 3 or the bars forming the diamond structures of the support 20 to bring the reinforcement bar 12 down. Advantageously, the elastic bands 74h, 74i and 74b stretched between the right and left knee pads of the diamond structures, avoid sudden and immediate winding of the ply 3 around the drum 5. Due to the compensation of the forces exerted by the elastic bands 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 sheet 3, the user unrolls it substantially completely until the support portion 84 engages in the housing 86. The housing 86 remains covered by the assembly formed by the sheet 3 and the primer, therefore inoperative , until the last turn of the drum 5 before complete unwinding. Substantially up to the fully unrolled position of the ply 3, it is therefore possible, at any time, to wind or uncoil the ply 3 freely. During the last turn, the housing 86 is uncovered. Passing in front of the lever 80, the latter then engages, under the effect of the spring 82, in the housing 86, making any subsequent winding of the ply 3 impossible without user intervention on the control part 88. L the primer is then taken out of the trunk 6. The user then pulls frontally, that is to say substantially perpendicular to the plane of the ply 3, the upper strip 11 out of the groove 16 of the reinforcement bar 12. Similarly , it detaches the lower edge of the sheet 3 from the primer. To secure the upper edge of the replacement ply to the reinforcement bar 12, the user pushes the upper strip of this ply frontally in the groove 16 until the bead 15 clicks 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 to the primer, for example by gluing. Advantageously, thanks to the primer, (a 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 part 84 of the housing 86 by pressing the control part 88 of the lever, which allows the rotation of the drum 5 in the winding direction E. Preferably, as soon as the support part 84 is released from the housing 86, the drum 5 performs a first winding turn on itself during which the replacement ply or the primer covers the housing 86. The user can then relax his action on the part of support 84, and continue winding the replacement ply around the drum 5 to the folded position of the support 20. As is now clearly apparent, the support 20 according to the invention allows mounting and dismounting of the device according to the invention very ra pide, 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 include any number of diamonds, for example comprising only one diamond. The support according to the invention could also be used for stretching awnings, blinds, or any other device requiring the deployment and tensioning of a sheet. The winding, in the folded position, of a ply 3 around a drum is not a limiting constraint. Thus, in a variant of the invention as shown in FIG. 10, no means of winding the tablecloth is not provided, the tablecloth resting, for example wound on itself, in bulk or folded, in the folded position of the support The lower edge of the tablecloth is fixed on a lower reinforcement bar 80 secured to the foot 7 Under the effect of the elastic stretched between the right and left knee pads, the support unfolds by itself, without user intervention, until the ply 3 is stretched between the reinforcement bars 12 and 80. Advantageously, in this variant of the invention, the elastic bands serve therefore not only means for unfolding the support, but also means for tensioning the ply 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 layers can 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, a plurality of supports according to the invention can be used, the reinforcement bars of which would be connected to one another, 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, by placing them one next to the other so that by unfolding the supports of these devices, one unwinds two layers hiding said supports. The number of diamonds provided with an elastic is not limiting. For example, only the 30h high diamond could be fitted with it.

Claims

REVENDICATIONS
1. Support à géométrie variable mobile entre des positions repliée et dépliée dans lesquelles des extrémités supérieure (70) et inférieure (72) dudit support sont rapprochées et écartées, respectivement, comportant au moins une structure en parallélogramme articulé (30b ;30i ;30h) comportant des genouillères supérieure (32b;32i;32h) et inférieure (34b;34i;34h) opposées, rapprochées dans ladite position repliée et écartées dans ladite position dépliée, et des genouillères gauche (36b; 36i;36h) et droite (38b;38i;38h) opposées, écartées dans ladite position repliée et rapprochées dans ladite position dépliée, des moyens de dépliement (74b;74i;74h) tendant à rapprocher en permanence lesdites genouillères gauche (36b;36i;36h) et droite (38b;38i;38h), des moyens de repliement tendant à rapprocher en permanence lesdites genouillères supérieure (32b; 32i; 32h) et inférieure (34b; 34i; 34h), lesdits moyens de repliement comportant au moins un tambour (5) monté à rotation axiale autour d'un axe d'enroulement (T) sur une embase (60) dudit support, une nappe (3) fixée d'une part sur ledit tambour (5) et d'autre part sur ladite extrémité supérieure (70) dudit support, et des moyens élastiques d'enroulement de ladite nappe (3) autour dudit tambour (5), caractérisé en ce que lesdits moyens de dépliement comportent un élastique (74b;74i;74h).1. Support with variable geometry movable between folded and unfolded positions in which upper (70) and lower (72) ends of said support are brought closer and apart, respectively, comprising at least one articulated parallelogram structure (30b; 30i; 30h) comprising upper (32b; 32i; 32h) and lower (34b; 34i; 34h) kneepads opposite, brought together in said folded position and spread apart in said unfolded position, and left (36b; 36i; 36h) and right (38b) knee pads; 38i; 38h) opposite, separated in said folded position and brought together in said unfolded position, unfolding means (74b; 74i; 74h) tending to constantly bring said left (36b; 36i; 36h) and right (38b; 38i) kneepads ; 38h), folding means tending to continuously bring said upper (32b; 32i; 32h) and lower (34b; 34i; 34h) knee pads closer together, said folding means comprising at least one drum (5) mounted in axial rotation around a winding axis (T) on a base (60) of said support, a ply (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 for winding said ply (3) around said drum (5), characterized in that said unfolding means comprise an elastic (74b; 74i; 74h).
2. Support selon la revendication 1, caractérisé en ce que lesdits moyens de dépliement (74b;74i;74h) sont fixés sur des axes (56b,58b;56i,58i;56h,58h) desdites genouillères gauche (36b;36i;36h) et droite (38b;38i;38h).2. Support according to claim 1, characterized in that said unfolding means (74b; 74i; 74h) are fixed on axes (56b, 58b; 56i, 58i; 56h, 58h) of said left knee pads (36b; 36i; 36h ) and right (38b; 38i; 38h).
3. Support selon l'une quelconque des revendications 1 et 2, caractérisé en ce qu'il comporte un élastique (74b;74i;74h) formant une boucle fermée enroulée autour desdits axes (56b,58b;56i,58i;56h,58h) desdites genouillères gauche (36b ; 36i ; 36h) et droite (38b; 38i ; 38h).3. Support according to any one of claims 1 and 2, characterized in that it comprises an elastic (74b; 74i; 74h) forming a closed loop wound around said axes (56b, 58b; 56i, 58i; 56h, 58h ) said left (36b; 36i; 36h) and right (38b; 38i; 38h) knee pads.
4. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens de repliement sont conformés pour compenser l'action desdits moyens de dépliement (74b;74i;74h). 4. Support according to any one of the preceding claims, characterized in that said folding means are shaped to compensate for the action of said unfolding means (74b; 74i; 74h).
5. Support selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des moyens de blocage (80,86) dans ladite position dépliée, s'enclenchant d'eux-mêmes quand ledit support atteint ladite position dépliée.5. Support according to any one of the preceding claims, characterized in that it comprises locking means (80,86) in said unfolded position, engaging themselves when said support reaches said unfolded position.
6. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite genouillère supérieure (32b;32i) comporte deux branches6. Support according to any one of the preceding claims, characterized in that said upper toggle joint (32b; 32i) has two branches
(40i,42i ;40b,42b) articulées autour d'un axe de genouillère supérieure (52b;52i) et se prolongeant de l'autre côté dudit axe de genouillère supérieure (52b ;52i) pour former deux branches (46h,44h ;46i,44i) d'une genouillère inférieure (34h;34i) d'une deuxième structure en parallélogramme (30h ;30i) dudit support.(40i, 42i; 40b, 42b) articulated around an upper toggle pin (52b; 52i) and extending on the other side of said upper toggle pin (52b; 52i) to form two branches (46h, 44h; 46i, 44i) of a lower toggle joint (34h; 34i) of a second parallelogram structure (30h; 30i) of said support.
7. Support selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des moyens de cliquet comprenant un levier (80) solidaire de ladite embase (60) et en appui élastique permanent sur une surface d'enroulement (14) dudit tambour (5), ladite surface d'enroulement (14) comportant un logement (86) ou une saillie dans lequel ledit levier (80) peut s'encliqueter.7. Support according to any one of the preceding claims, characterized in that it comprises pawl means comprising a lever (80) integral with said base (60) and in permanent elastic support on a winding surface (14) said drum (5), said winding surface (14) having a housing (86) or a projection into which said lever (80) can snap.
8. Support selon la revendication 7, caractérisé en ce que ladite nappe (3) est fixée sur ledit tambour (5) de manière à recouvrir ledit logement (86) ou ladite saillie tant que ledit support n'a pas atteint une position dans laquelle ladite nappe (3) est sensiblement complètement déroulée.8. Support according to claim 7, characterized in that said ply (3) is fixed on said drum (5) so as to cover said housing (86) or said projection as long as said support has not reached a position in which said sheet (3) is substantially completely unwound.
9. Support selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un coffre (6) recevant ladite structure dans ladite position repliée.9. Support according to any one of the preceding claims, characterized in that it comprises a box (6) receiving said structure in said folded position.
10. Support selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite structure en parallélogramme est une structure en losange.10. Support according to any one of the preceding claims, characterized in that said parallelogram structure is a diamond structure.
11. Utilisation d'un support selon l'une quelconque des revendications précédentes dans un dispositif de présentation d'informations, un store, un auvent ou une cabine. 11. Use of a support according to any one of the preceding claims in an information presentation device, a blind, an awning or a cabin.
PCT/FR2004/002059 2003-07-30 2004-07-30 Variable geometry support with parallelogram structure WO2005012782A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0309391A FR2858389A1 (en) 2003-07-30 2003-07-30 VARIABLE GEOMETRY BRACKET WITH PARALLELOGRAM STRUCTURE
FR0309391 2003-07-30

Publications (2)

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WO2005012782A2 true WO2005012782A2 (en) 2005-02-10
WO2005012782A3 WO2005012782A3 (en) 2005-04-21

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FR (1) FR2858389A1 (en)
WO (1) WO2005012782A2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821965A1 (en) 2001-03-08 2002-09-13 Guy Doat Variable advertising display panel has flexible display web on roller with rib to retain elastic torsion spring inside it

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
GB176083A (en) * 1920-11-25 1922-02-27 Archibald Turner Improvements in or relating to shock absorbing devices and resilient supporting means
US1946639A (en) * 1931-06-30 1934-02-13 Eastman Kodak Co Folding projection screen
DE651642C (en) * 1934-09-07 1937-10-16 Gunnar Sjoewall Frame for photographic cameras
US2440096A (en) * 1945-06-07 1948-04-20 Webster W Jury Extensible support
US3096059A (en) * 1961-03-22 1963-07-02 F And F Koenigkramer Company Telescoping means having indexing, braking and interlocking means
IT8411824V0 (en) * 1984-09-18 1984-09-18 Targetti Sankey Spa ARTICULATED CREW BALANCING EQUIPMENT FOR TABLE LUMES, WITH AN ARTICULATED QUADRILATERAL ASSOCIATED WITH AN ELASTIC ELEMENT ACTING ACCORDING TO A DIAGONAL
JP3411515B2 (en) * 1998-08-20 2003-06-03 泉株式会社 Portable screen
CN1284126C (en) * 2000-09-25 2006-11-08 马克布莱斯股份公司 Information presentation apparatus and method of mounting display panel to information presentation apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821965A1 (en) 2001-03-08 2002-09-13 Guy Doat Variable advertising display panel has flexible display web on roller with rib to retain elastic torsion spring inside it

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FR2858389A1 (en) 2005-02-04
WO2005012782A3 (en) 2005-04-21

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