Tilting tray display

Abstract

Display stand (1) having a longitudinal direction, a transverse direction defining a front side and a rear side and a vertical direction, comprising: a frame (2); an upper plate (3), and a lower plate (4); a two-bar structure (5) articulated on the frame and the upper plate around axes parallel to the longitudinal direction. The frame, the upper plate and the two-bar structure together form a quadrilateral planar mechanism. The display stand further has: a closed configuration, in which the upper plate is inclined in a position, called a reference position, and an open configuration, in which the lower plate is offset rearwardly relative to the reference position. Summary figure: figure 1

Description

Title of the invention: Tilting tray display Technical field

[0001] The present invention relates to a tilting tray display. State of the prior art

[0002] There are displays with two trays or two fixed tray holders, for example for displaying vegetables.

[0003] A role for an operator may be to place objects, for example fruits and vegetables, on each of the two trays. The two trays cannot both be in the same reference position which would be comfortable for the operator, the operator is forced to work in at least one restrictive position.

[0004] In addition, operators adopted these positions within a very short time. This haste multiplies the risk factor, because of falls, but also because operators no longer seek to adopt suitable positions.

[0005] Consequently, when these platforms are fixed, the operator can then develop musculoskeletal disorders. Statement of the invention

[0006] One aim of the invention is in particular to remedy all or part of the aforementioned drawbacks.

[0007] To this end, there is proposed, according to a first aspect of the invention, a display stand having a longitudinal direction, a transverse direction defining a front side and a rear side and a vertical direction, comprising:

[0008] - a frame;

[0009] - an upper tray, and a lower tray;

[0010] - a two-bar structure articulated on the frame and the upper plate around axes parallel to the longitudinal direction.

[0011] The frame, the upper plate and the two-bar structure together form a quadrilateral planar mechanism (the upper plate can thus be moved relative to the frame around the longitudinal axis).

[0012] The display further presents:

[0013] - a closed configuration, in which the upper plate is inclined in a position, called reference, and

[0014] - an open configuration, in which the lower tray is offset towards the rear relative to the reference position.

[0015] Advantageously, the two-bar structure may comprise two deformable quadrilaterals arranged on either side of the plate in the longitudinal direction.

[0016] According to one possibility, the display stand may further comprise a jack functionally arranged in a transverse plane between the frame and the upper plate.

[0017] In the open configuration, the surface in which the upper plate is inscribed and the surface in which the lower plate is inscribed may be parallel to each other with a reference plane and / or said surfaces may be substantially contiguous.

[0018] In the closed configuration, the upper plate is positioned in a reference plane, parallel to and above the lower plate in the vertical direction of the device 1.

[0019] Alternatively, the dimensions of the bars of the two-bar structure are substantially equal.

[0020] The lower plate can be fixed on the frame.

[0021] In some embodiments, the display further comprises a second two-bar structure hinged to the frame, and the lower tray around axes parallel to the longitudinal direction, the frame, the lower tray and the second two-bar structure then together forming a second quadrilateral planar mechanism.

[0022] Preferably, in several angular positions of the two-bar structure, the deformation of the first two-bar structure causes the deformation of the second two-bar structure.

[0023] Advantageously, the deformation of the second two-bar structure by the first two-bar structure can be achieved by means of two force transmission connecting rods functionally arranged between the two two-bar structures.

[0024] Still advantageously, the deformation of the second two-bar structure by the two-bar structure can be achieved by means of an extension of one of the connecting rods of the two two-bar structures.

[0025] Preferably, the first two-bar structure and the second two-bar structure have several angular positions in which one of the two bars of the first two-bar structure is in plane support on one of the two bars of the second two-bar structure by means of a protrusion, or vice versa.

[0026] In certain particular embodiments, the articulation axes of the first two-bar structure on the frame and the articulation axes of the second two-bar structure on the frame are coincident in pairs. Description of figures

[0027] Other advantages and particularities of the invention will appear on reading the detailed description of implementations and embodiments which are in no way limiting, with regard to the appended drawings in which: • [Fig.l] is a perspective view of a device according to the invention, • [Fig.2] is a schematic view of the device shown in [Fig.l], taken from its left side, in a closed configuration, • [Fig.3] is a view similar to [Fig.2], with the device in an open configuration, • [Fig.4] is a kinematic diagram of the two configurations shown in [Fig.2] and [Fig.3], • [Fig.5] is a kinematic diagram of the device shown in [Fig.l], • [Fig.6] is a perspective view of a second device according to the invention, • [Fig.7] is a schematic view of the device shown in [Fig.6], taken from its left side, in an open configuration, • [Fig.8] is a perspective view of a third device according to the invention, • [Fig.9] is a schematic view of the device shown in [Fig.8], taken from its left side, in an open configuration, • [Fig. 10] is a perspective view of a fourth device according to the invention, • [Fig. 11] is a schematic view of the device shown in [Fig.l], taken from its left side, in an open configuration, • [Fig. 12] is a view similar to [Fig. 11], the device being in a closed configuration, • [Fig. 13] is a kinematic diagram of the two configurations shown in [Fig. 11] and [Fig. 12], • [Fig. 14] is a kinematic diagram of the device shown in [Fig. 10]. Description of embodiments

[0028] The embodiments described below being in no way limiting, it will be possible in particular to consider variants of the invention comprising only a selection of the characteristics described, subsequently isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art. This selection comprises at least one characteristic, preferably functional without structural details, or with only a part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.

[0029] In the figures, an element appearing in several figures retains the same reference.

[0030] [Fig.l] illustrates a device 1 according to an embodiment of the invention.

[0031] Three directions X, Y and Z are shown in [Fig. 1]. The directions Y, X and Z are respectively called longitudinal direction, transverse direction and vertical direction.

[0032] When the device is installed on a horizontal floor, the vertical direction of the device and the vertical direction relative to the floor coincide.

[0033] The longitudinal direction makes it possible to define a left side and a right side of the device, corresponding respectively to the left part and the right part of [Fig.l].

[0034] The vertical direction makes it possible to define a low side and a high side of the device, corresponding respectively to the low part and the high part of [Fig.l].

[0035] The transverse direction makes it possible to define a front side and a rear side of the device, corresponding respectively to the foreground and the background of [Fig.l].

[0036] A horizontal plane is a plane perpendicular to the vertical direction of the device.

[0037] A reference plane is a horizontal plane that has undergone a rotation of a predetermined reference angle around the longitudinal axis of the device, possibly zero.

[0038] A reference plane may for example be inclined by 30 degrees around the longitudinal axis of the device relative to a horizontal plane.

[0039] A transverse plane is a plane along a transverse direction and a vertical direction of the device. Description of a first embodiment

[0040] An exemplary embodiment of a device according to the invention is now described with reference to Figures 1 to 5.

[0041] The device 1 comprises a frame 2 and an upper tray holder 3.

[0042] In the example shown, the device 1 further comprises a tray holder lower 4 fixed on the frame. The lower tray holder is arranged according to a reference plane.

[0043] It is understood that the tray holders 3, 4 could be substituted by trays.

[0044] The device further comprises a structure with two bars 5 moving in the plane vertical of the device 1, articulated on the frame 2 and the upper plate holder 3 around longitudinal axes.

[0045] Thus, each of the bars of the two-bar structure 5 is mounted in pivot connection with the frame 2 and the upper tray holder 3 around longitudinal axes.

[0046] The pivot axes between the bars and the frame are denoted A and B. The pivot axes between the bars and the upper plate holder are denoted C and D.

[0047] Also, the frame 2, the upper tray holder and the two-bar structure 5 together form a quadrilateral planar mechanism (from the family of four-bar mechanisms), also called an articulated planar quadrilateral, one bar of which is materialized by the frame 2, its opposite bar being materialized by the upper tray holder 3, the other two bars being materialized by the bars of the two-bar structure 5.

[0048] In the example shown, the two-bar structure 5 comprises two deformable quadrilaterals arranged on either side of the tray holder in the longitudinal direction.

[0049] Alternatively, the two-bar structure 5 could consist of a single deformable quadrilateral which can be arranged at the middle of the tray holder in the longitudinal direction, or at one of its sides.

[0050] According to still other possibilities, the two-bar structure 5 could be formed of three or more deformable quadrilaterals.

[0051] The device 1 has a configuration, called closed, shown in Figures 1 and 2.

[0052] In the closed configuration, the upper tray holder 3 is arranged in a position, called a reference position. The reference position is predetermined so that an operator can comfortably place items on or remove items from the upper tray holder 3.

[0053] In the reference position, the upper tray holder 3 is positioned in a reference plane, above and parallel to the lower tray holder 4 in the vertical direction of the device 1. Alternatively, the tray holder 3 could be positioned in a reference plane, above, but not parallel to, the lower tray holder 4 in the vertical direction of the device 1, so that an operator can always comfortably place or remove articles from the upper tray holder 3.

[0054] Still in the closed configuration, there is an upper stop As of the connecting rod 5g on the frame 2. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0055] Still in the closed configuration, there is an upper stop of the connecting rod 5d on the frame 2. This stop, or support, can be modeled as resulting from a rectilinear rectangular connection L1. According to other possibilities, these upper stops could be produced by a multitude of connections different from those present in the state.

[0056] The bonds present in the closed configuration are represented by an alternation of dashes and dots in the bond graph.

[0057] The device 1 further has a configuration, called open, shown in [Fig.3].

[0058] In the open configuration, the surface in which the upper tray holder 3 fits and the surface in which the lower tray holder 4 fits are parallel to each other with a reference plane and said surfaces are substantially contiguous. Alternatively, the two aforementioned surfaces may not be contiguous and may be offset from each other by several centimeters.

[0059] Still in the open configuration, there is a lower stop of the plate 3 on the plate holder 4, that is to say the frame 2. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0060] Still in the open configuration, there is a lower stop of the connecting rod 5d on the frame 2. This stop, or support, can be modeled as resulting from a rectilinear rectangular connection L1. According to other possibilities, these lower stops could be produced by a multitude of connections different from those present in the state.

[0061] The bonds present in the open configuration are represented by dashes in the bond graph.

[0062] To move between the open position and the closed position, the device 1 further comprises an electric cylinder 6 arranged in a transverse plane and which is articulated on the frame 2 and the bar structure 5. According to other possibilities, the movement from the open to closed position could be done by means of other non-limiting devices such as a gas cylinder, spring, counterweight or even manual action by means of a pedal.

[0063] The electric cylinder 6 has a cylinder body 6c which is on the one hand mounted for rotation about the longitudinal axis E on the frame 2 and on the other hand slidably mounted on a cylinder rod 6t.

[0064] The 6t cylinder rod is mounted for rotation about a longitudinal axis F with one end of a first transmission rod Btl. The other end of the transmission rod Btl is mounted for rotation about a longitudinal axis G with the frame.

[0065] The cylinder rod 6t is further mounted for rotation about the same longitudinal axis F with one end of a second transmission rod Bt2. The other end of the transmission rod Bt2 is mounted for rotation about a longitudinal axis H with the connecting rod 5d.

[0066] It is understood that the variation in length of the rod of the jack 6 causes a deformation of the two-bar structure 5, which causes the displacement of the upper platen holder 3 relative to the frame 2, and therefore relative to the lower platen holder 4. Description of a second embodiment

[0067] A second exemplary embodiment of a device according to the invention is now described with reference to Figures 6 and 7.

[0068] The device 11 comprises a frame 12 and an upper plate 13.

[0069] In the example shown, the device 11 further comprises a lower plate 14 fixed to the chassis. The lower plate is arranged in a horizontal plane.

[0070] It is understood that the trays 13, 14 could be substituted by tray holders.

[0071] The upper plate 13 is mounted in circular translation relative to the frame in a direction parallel to the longitudinal direction.

[0072] As for the device 1, the device 11 further comprises a two-bar structure 15 moving in the vertical plane of the device 11, articulated on the frame 12 and the upper plate 13 around longitudinal axes.

[0073] Thus, each of the bars of the two-bar structure 15 is mounted in pivot connection with the frame 12 and the upper plate 13 around longitudinal axes.

[0074] The pivot axes between the bars and the frame are denoted A and B. The pivot axes between the bars and the upper plate are denoted C and D.

[0075] More particularly, the dimensions of the bars of the two-bar structure 15 are substantially equal. Consequently, the two-bar structure 15 is a deformable parallelogram structure.

[0076] Also, the frame 12, the upper plate and the two-bar structure 15 together form a particular quadrilateral planar mechanism (from the family of four-bar mechanisms), also called an articulated planar parallelogram, one bar of which is materialized by the frame 12, its opposite bar being materialized by the upper plate 13, the other two bars being materialized by the bars of the two-bar structure 15.

[0077] In the example shown, the two-bar structure 15 comprises two deformable quadrilaterals arranged on either side of the plate in the longitudinal direction.

[0078] Alternatively, the two-bar structure 15 could consist of a single deformable quadrilateral which can be arranged at the middle of the board in the longitudinal direction, or at one of its sides.

[0079] According to still other possibilities, the two-bar structure 15 could be formed of three or more deformable quadrilaterals.

[0080] The device 11 has a configuration, called closed, shown in [Fig.7].

[0081] In the closed configuration, the upper tray 13 is arranged in a position, called a reference position. The reference position is predetermined so that an operator can comfortably place articles on the upper tray 13 or remove them.

[0082] In the reference position, the upper plate 13 is positioned in a reference plane.

[0083] The device 11 further has a configuration, called open, shown in [Fig.6].

[0084] In the open configuration, the surface in which the upper tray holder 3 fits and the surface in which the lower tray holder 4 fits are substantially contiguous. According to another possibility, the two aforementioned surfaces may not be contiguous and may be offset from each other by several centimeters.

[0085] To move between the open position and the closed position, the device 11 further comprises an electric jack 16 arranged in a transverse plane which is articulated on the frame 12 and the bar structure 15.

[0086] It is understood that the variation in length of the jack rod causes a deformation of the two-bar structure 15, which ultimately causes the upper plate 13 to move relative to the frame 12. Description of the third embodiment

[0087] A third example embodiment of a device according to the invention is now described with reference to Figures 8 and 9.

[0088] The device 21 comprises a frame 22, an upper plate 23, and a lower plate 24.

[0089] It is understood that the trays 23, 24 could be substituted by tray holders.

[0090] Each of the plates 23, 24 is mounted in circular translation relative to the frame in a direction parallel to the longitudinal direction.

[0091] The device 21 further comprises two two-bar structures 253, 254 moving in the vertical plane of the device 21, each of the structures being articulated on the frame 22 and the upper plate 23 around longitudinal axes.

[0092] Thus, each of the bars of the two two-bar structures 253, 254 is mounted in pivot connection with the frame 22 and the upper plate 23 around longitudinal axes.

[0093] The pivot axes between the bars of the structure 253 and the frame are denoted A and B. The pivot axes between the bars of the structure 253 and the upper plate are denoted C and D.

[0094] The pivot axes between the bars of the structure 254 and the frame are noted A' and B'. The pivot axes between the bars of structure 254 and the upper plate are noted C' and D'.

[0095] More particularly, the dimensions of the bars of each of the two-bar structures 253, 254 are substantially equal. Accordingly, each of the two-bar structures 253, 254 is a deformable parallelogram structure.

[0096] The frame 22, the upper plate and the two-bar structure 253 together form a first particular quadrilateral planar mechanism (from the family of four-bar mechanisms), also called an articulated planar parallelogram, one bar of which is materialized by the frame 22, its opposite bar being materialized by the upper plate 23, the other two bars being materialized by the bars of the two-bar structure 253.

[0097] The frame 22, the upper plate and the two-bar structure 254 together form a second quadrilateral planar mechanism (of the family of four-bar mechanisms) particular, also called articulated plane parallelogram, one bar of which is materialized by the frame 22, its opposite bar being materialized by the lower plate 24, the other two bars being materialized by the bars of the two-bar structure 254.

[0098] The two plates 23, 24 being mounted in a horizontal plane, the two plates remain in a horizontal plane during their circular translation relative to the frame 22.

[0099] In the example shown, each of the two-bar structures 253, 254 comprises two deformable quadrilaterals arranged on either side of each of the plates 23, 24 in the longitudinal direction.

[0100] Alternatively, each of the two-bar structures 253, 254 could be made up of a single deformable quadrilateral that can be arranged at the middle of each of the plates in the longitudinal direction, or at one of its sides.

[0101] According to still other possibilities, each of the two-bar structures 253, 254 could be formed from three or more deformable quadrilaterals.

[0102] The device 21 has a configuration, called closed, shown in [Fig.9].

[0103] In the closed configuration, the trays 23 and 24 are arranged in two reference positions. These reference positions are predetermined so that an operator can comfortably place items on both the tray 23 and the tray 24, or remove them.

[0104] The device 21 further has a configuration, called open, shown in [Fig.8].

[0105] In the open configuration, the surface in which the upper tray 23 fits and the surface in which the lower tray 24 fits are parallel to each other with a horizontal plane and the surfaces are substantially contiguous. Alternatively, the upper tray 23 could be positioned in a reference plane, above, but not parallel to, the lower tray holder 24 in the vertical direction of the device 21, so that an operator can always and comfortably place articles on or remove them from the upper tray holder 23.

[0106] The device 21 comprises a slide 28 and two transmission rods 273, 274, each of the rods having one end rotatably mounted on the slide 28.

[0107] The transmission connecting rod 273 is rotatably mounted on the slide 28 along a longitudinal axis E and on one of the bars of the two-bar structure 253 along a longitudinal axis F.

[0108] The transmission connecting rod 274 is rotatably mounted on the slide 28 along the axis E and on one of the bars of the two-bar structure 254 along a longitudinal axis F'.

[0109] The slide 28 is mounted in translation with a transverse axis on the frame 21.

[0110] To move between the open position and the closed position, the device 21 further comprises an electric cylinder 26 arranged in a transverse plane and having a cylinder body fixed to the frame 22 and a cylinder head fixed to the slide 28.

[0111] In several angular positions of the two-bar structure 253, the deformation of the two-bar structure 253 causes the deformation of the second two-bar structure 254.

[0112] The deformation of the second two-bar structure 254 by the two-bar structure 253 is carried out by means of the two force transmission connecting rods 273, 274 functionally arranged between the two two-bar structures.

[0113] It is understood that the variation in length of the jack rod causes a translation of the slide 28, which causes on the one hand a deformation of the two-bar structure 253 which causes the circular translation of the upper plate 23, and on the other hand a deformation of the two-bar structure 254 which causes the circular translation of the upper plate 24. Description of a fourth embodiment

[0114] A fourth example of embodiment of a device 31 according to the invention is now described with reference to FIGS. 10 to 13.

[0115] The device 31 comprises a frame 32, an upper plate 33 and a lower plate 34.

[0116] It is understood that the trays 33, 34 could be substituted by tray holders.

[0117] Each of the plates 33, 34 is mounted in circular translation relative to the frame in a direction parallel to the longitudinal direction.

[0118] The device 31 further comprises two structures with two bars 353, respectively 354, evolving in the vertical plane of the device 31, each of the structures being articulated on the frame 32 and the upper plate 33, respectively the lower plate 34, around longitudinal axes.

[0119] Thus, each of the bars of the two two-bar structures 353, respectively 354, is mounted in pivot connection with the frame 32 and the upper plate 33, respectively the lower plate 34, around longitudinal axes.

[0120] The pivot axes between the bars of the structure 353 and the frame are denoted A and B. The pivot axes between the bars of the structure 353 and the upper plate are denoted C and D.

[0121] The pivot axes between the bars of the structure 354 and the frame are denoted A' and B'. The pivot axes between the bars of the structure 354 and the lower plate are denoted C' and D'.

[0122] More particularly, the dimensions of the bars of each of the two-bar structures 353, 354 are substantially equal. Accordingly, each of the two-bar structures 353, 354 is a deformable parallelogram structure.

[0123] The frame 32, the upper plate and the two-bar structure 353 together form a first particular quadrilateral planar mechanism (from the family of four-bar mechanisms), also called an articulated planar parallelogram, one bar of which is materialized by the frame 32, its opposite bar being materialized by the upper plate 33, the other two bars being materialized by the bars of the two-bar structure 353.

[0124] The frame 32, the lower plate and the two-bar structure 354 together form a second particular quadrilateral planar mechanism (from the family of four-bar mechanisms), also called an articulated planar parallelogram, one bar of which is materialized by the frame 32, its opposite bar being materialized by the lower plate 34, the other two bars being materialized by the bars of the two-bar structure 354.

[0125] Furthermore, the axes A and A' are coincident, as are the axes B and B'. Consequently, the two circular translations are parallel.

[0126] The two plates 33, 34 being mounted in a reference plane, the two plates remain in a reference plane during their circular translation relative to the frame 32.

[0127] In the example shown, each of the two-bar structures 353, 354 comprises two deformable quadrilaterals arranged on either side of each of the plates 33, 34 in the longitudinal direction.

[0128] Alternatively, each of the two-bar structures 353, 354 could be made up of a single deformable quadrilateral that can be arranged at the middle of each of the plates in the longitudinal direction, or at one of its sides.

[0129] According to still other possibilities, each of the two-bar structures 353, 354 could be formed from three or more deformable quadrilaterals.

[0130] The device 31 has a configuration, called closed, shown in [Fig. 12].

[0131] In the closed configuration, the upper plate 33 is arranged in a position, called a reference position. The reference position is predetermined so that an operator can comfortably place articles on the upper plate 33 or remove them. Alternatively, in the closed configuration, the plates 33 and 34 are arranged in reference positions. The reference positions are predetermined so that an operator can comfortably place articles on both the plate 33 and the plate 34, or remove them.

[0132] In the reference position, the upper tray holder 33 is positioned in a reference plane, parallel to and above the lower tray holder 34 in the vertical direction of the device 31. According to another possibility, the tray upper tray 33 could be positioned in a reference plane, above, but not parallel to, the lower tray holder 34 in the vertical direction of the device 31, so that an operator can always and comfortably place articles on or remove them from the upper tray holder 33.

[0133] Still in the closed configuration, there is an upper stop As of the upper plate 33 on the connecting rod 353g. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0134] Still in the closed configuration, there is an upper stop As of the upper plate 33 on the connecting rod 353d. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0135] Still in the closed configuration, there is an upper stop As of the lower plate 34 on the connecting rod 354g. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0136] Still in the closed configuration, there is a lower stop As of the lower plate 34 on the connecting rod 354d. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0137] The geometry of the connecting rods of the 2-bar structure 353 makes the aforementioned supports possible during the open and closed configurations.

[0138] The bonds present in the closed configuration are represented by an alternation of dashes and dots in the bond graph.

[0139] The device 31 further has a configuration, called open, shown in Figures 10 and 11.

[0140] In the open configuration, the surface in which the upper tray 33 fits and the surface in which the lower tray 34 fits are parallel to each other with a reference plane and the surfaces are substantially contiguous. Alternatively, the upper tray 33 could be positioned in a reference plane, above, but not parallel to, the lower tray holder 34 in the vertical direction of the device 31, so that an operator can always and comfortably place articles on or remove them from the upper tray holder 33.

[0141] Still in the closed configuration, there is an upper stop As of the connecting rod 354d on the frame 32. This stop, or support, can be modeled as resulting from a plane support connection Ap.

[0142] To move between the open position and the closed position, the device 31 further comprises an electric cylinder 36 arranged in a transverse plane and having a cylinder body fixed to the connecting rod 353g at F and a cylinder head fixed to the frame at E. According to other possibilities, the movement from the open to closed position could be done by means of other devices which are in no way limiting such as a gas cylinder, spring, counterweight or even manual action by means of a pedal.

[0143] In several angular positions of the two-bar structure 353, the deformation of the two-bar structure 353 causes the deformation of the second two-bar structure 354.

[0144] In the example shown, the deformation of the second two-bar structure 354 by the two-bar structure 353 is carried out by means of an extension 37 of one of the connecting rods of the two two-bar structures 353, and more precisely by the connecting rod 353g in the example illustrated.

[0145] Furthermore, the first two-bar structure 353 and the second two-bar structure 354 have several angular positions, including the open position, in which one of the two bars of the first two-bar structure 353 is in plane support, by means of a transverse extension of one of the connecting rods and more precisely the connecting rod 353 g in the illustrated example, on one of the two bars of the second two-bar structure (354 g), or vice versa,

[0146] This feature allows the rotation of the second structure to be driven by the first structure. One technical effect is to reduce the number of parts to transmit the force from the jack to the second structure. Another advantage is the simultaneity of the movements. Yet another advantage is to reduce the risk of collision between the parts if the movements are no longer synchronized, for example in the case of non-synchronous jacks.

[0147] Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention. In addition, the various characteristics, forms, variants and embodiments of the invention can be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other.

Claims

Claims

1. Display stand (1; 11; 21; 31) having a longitudinal direction, a transverse direction defining a front side and a rear side and a vertical direction, comprising: a frame (2; 12; 22; 32), an upper plate (3; 13; 23; 33), and a lower plate (4; 14; 24; 34) a two-bar structure (5; 15; 253; 353) articulated on the frame and the upper plate about axes parallel to the longitudinal direction, in which the frame, the upper plate and the two-bar structure together form a quadrilateral planar mechanism, the display stand further having: a closed configuration, in which the upper plate is inclined in a position, called a reference position, and an open configuration, in which the lower plate is offset rearwardly relative to the reference position.

2. Display stand according to claim 1, in which the two-bar structure (5; 15; 25; 35) comprises two deformable quadrilaterals arranged on either side of the tray in the longitudinal direction.

3. Display stand according to any one of the preceding claims, further comprising a jack (6; 16; 26; 36) operatively arranged in a transverse plane between the frame (2; 12; 22; 32) and the upper plate (5; 15; 253; 353).

4. Display stand according to any one of the preceding claims, wherein, in the open configuration, the surface in which the upper tray (3; 13; 23; 33) fits and the surface in which the lower tray (4; 14; 24; 34) fits are parallel to each other with a reference plane and / or said surfaces are substantially contiguous.

5. Display stand according to any one of the preceding claims, wherein, in the closed configuration, the upper tray (3; 13; 23; 33) is positioned in a reference plane, parallel to and above the lower tray (4; 14; 24; 34) in the vertical direction of the device 1.

6. A display stand according to any preceding claim, wherein the dimensions of the bars of the two-bar structure (15; 253; 353) are substantially equal.

7. Display stand according to any one of the preceding claims, in which the lower tray (4; 14) is fixed to the frame.

8. A display stand according to any preceding claim, further comprising a second two-bar structure (254; 354) hinged to the frame (22, 32), and the lower plate (24, 34) about axes parallel to the longitudinal direction, wherein the frame, the lower plate and the second two-bar structure together form a second quadrilateral planar mechanism.

9. Display stand according to the preceding claim, in several angular positions of the two-bar structure (253; 353), the deformation of the two-bar structure (253; 353) causes the deformation of the second two-bar structure (254; 354).

10. Display stand according to the preceding claim, wherein the deformation of the second two-bar structure (254) by the two-bar structure (253) is carried out by means of two force transmission connecting rods (273, 274) operatively arranged between the two two-bar structures.

11. Display stand according to the preceding claim, in which the deformation of the second two-bar structure (354) by the two-bar structure (353) is carried out by means of an extension (37) of one of the connecting rods of the two two-bar structures (353, 354).

12. Display stand according to the preceding claim, in which the first two-bar structure (353) and the second two-bar structure (354) have several angular positions in which one of the two bars of the first two-bar structure (353) is in plane support on one of the two bars of the second two-bar structure (354) by means of a protrusion, or vice versa.

13. Display stand according to one of claims 9 to 12, in which the articulation axes (A, A'; B, B') of the first two-bar structure (353) on the frame and the articulation axes of the second two-bar structure (354) on the frame are two by two coincident.

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