Source: http://www.patentsencyclopedia.com/app/20160144964
Timestamp: 2018-04-22 03:57:14
Document Index: 381557182

Matched Legal Cases: ['art 7', 'art 8', 'art 7', 'art 8', 'art 8', 'art 6', 'art 8', 'art 8', 'art 7', 'art 7', 'art 7', 'art 7', 'art 8', 'art 7', 'art 7', 'art 8', 'art 7']

DISPLACEMENT SYSTEM FOR A SEAT, IN PARTICULAR AN AIRPLANE SEAT - Patent application
Patent application title: DISPLACEMENT SYSTEM FOR A SEAT, IN PARTICULAR AN AIRPLANE SEAT
Inventors: Alessandro Braca (Sezze Scalo (lt), IT) Alessio Morsicani (Sezze Scalo (lt), IT) Andrea Giordano (Sezze Scalo (lt), IT)
USPC Class: 297 63
Class name: Chairs and seats component of adjacent seats reorientable to single bed
Patent application number: 20160144964
The present invention concerns a displacement system (1) for a seat, in particular an airplane seat, said seat comprising a sitting portion, a backrest and a legrest, said displacement system (1) comprising a support structure (2) for the support of said seat, a sitting portion structure (3) for the support of said sitting portion, said a sitting portion structure (3) being connected to said support structure (2) and comprising a sitting portion surface lying at least on a first plane (α), and displacement means (4) acting at least on said sitting portion structure (3) in such a way that said displacement system (1) passes between a first configuration or sitting configuration and at least a second configuration or cradle configuration and vice versa, said displacement system (1) being characterised in that said sitting portion surface is subdivided into at least two sitting portions (5, 6), a first portion or back portion (5), lying on said first plane (α), and a second portion or front portion (6), lying on a second plane (δ), said portions (5, 6) being constrained in rotation with each other in the passage between said first configuration to said at least a second configuration, and vice versa, said displacement means (4) being configured in such a way to act on said second portion (6) so that in said first configuration said second plane (β) is inclined with respect to said first plane (α) by a first angle (x1) substantially of 180°, and in said at least a second configuration is inclined by a second angle (x2) positive and smaller than 180°.
16. A displacement system (1) for a seat, in particular an airplane seat, said seat comprising a sitting portion, a backrest and a legrest, said displacement system (1) comprising a support structure (2) for the support of said seat, a sitting portion structure (3) for the support of said sitting portion, said a sitting portion structure (3) being connected to said support structure (2) and comprising a sitting portion surface lying at least on a first plane (α), and displacement means (4) acting at least on said sitting portion structure (3) in such a way that said displacement system (1) passes between a first configuration or sitting configuration and at least a second configuration or cradle configuration and vice versa, said displacement system (1) being wherein said sitting portion surface is subdivided into at least two sitting portions (5, 6), a first portion or back portion (5), lying on said first plane (α), and a second portion or front portion (6), lying on a second plane (β), said portions (5, 6) being constrained in rotation with each other in the passage between said first configuration to said at least a second configuration, and vice versa, said displacement means (4) being configured in such a way to act on said second portion (6) so that in said first configuration said second plane (β) is inclined with respect to said first plane (α) by a first angle (x1) substantially of 180.degree., and in said at least a second configuration is inclined by a second angle (x2) positive and smaller than 180.degree..
17. The displacement system (1) according to claim 16, wherein said displacement means (4) are configured in such a way to act on said second portion (6) so that in said at least a second configuration said second plane (β) is inclined with respect to said first plane (α) by said second angle (x2) comprised between around +175.degree. and +120.degree..
18. The displacement system (1) according to claim 16, wherein said first portion (5) has a depth that is substantially the half of said second portion (6), in such a way to ergonomically support, during the use, the pelvis of a passenger.
19. The displacement system (1) according to claim 16, wherein said displacement means (4) are configured in such a way to act on said second portion (6) so that said displacement system (1) is able to pass between said first configuration, said at least a second configuration and a third configuration or bed configuration, and in that said displacement means (4) are configured in such a way that in said third configuration said second plane (β) is inclined with respect to said first plane (α) by a third angle (x3) substantially equivalent to 180.degree..
20. The displacement system (1) according to claim 16, wherein said displacement means (4) comprise at least a lever (9) hinged in a first end (17) in said support structure (2) and in the second end (18) in said second portion (6) of said sitting portion surface.
21. The displacement system (1) according to claim 16, wherein said support structure (2) comprises a fixed part (7) and a movable part (8) that is movable with respect to said fixed part (7), said movable part (8) being integrally connected to said first portion (5) of said sitting portion surface and in that said displacement means (4) are configured in such a way to act on said movable part (8) so that it moves in a front/back direction in the passage between said first configuration and said at least a second configuration and vice versa.
22. The displacement system (1) according to claim 16, wherein said first plane (a) whereon said first portion (5) lies, in the passage between said first configuration and said at least a second configuration, and vice versa, is constrained in a linear trajectory.
23. The displacement system (1) according to claim 21, wherein said fixed part (7) comprises at least a first sliding guide (10) and at least a second sliding guide (11), in that said movable part (8) is adapted to slide in said at least a first sliding guide (10), and in that said first end (17) of said lever (9) is adapted to slide in said at least a second sliding guide (11).
24. The displacement system (1) according to claim 22, wherein said fixed part (7) comprises at least a first sliding guide (10) and at least a second sliding guide (11), in that said movable part (8) is adapted to slide in said at least a first sliding guide (10), and in that said first end (17) of said lever (9) is adapted to slide in said at least a second sliding guide (11).
25. The displacement system (1) according to claim 24, wherein said at least a first sliding guide (10) is a linear guide.
26. The displacement system (1) according to claim 23, wherein said at least a second sliding guide (11) is substantially shaped in the form of a "V" in such a way to present a first portion (20) sloping down downwards and a second portion (19) sloping down upwards, such to provoke the tilting movement of said second portion (6).
27. The displacement system (1) according to claim 24, wherein said at least a second sliding guide (11) is substantially shaped in the form of a "V" in such a way to present a first portion (20) sloping down downwards and a second portion (19) sloping down upwards, such to provoke the tilting movement of said second portion (6).
28. The displacement system (1) according to claim 25, wherein said at least a second sliding guide (11) is substantially shaped in the form of a "V" in such a way to present a first portion (20) sloping down downwards and a second portion (19) sloping down upwards, such to provoke the tilting movement of said second portion (6).
29. The displacement system (1) according to claim 16, further comprising a backrest structure (12) constrained in rotation to said first portion (5) of said sitting portion surface, said backrest structure (12) presenting a backrest surface, for the support, during the use, of the back of a passenger, lying on a third plane (γ), and in that said displacement means (4) are configured in such a way to act on said backrest structure (13) so that when said displacement system (1) is in said first configuration said third plane (γ) is inclined with respect to said first plane (α) by a fourth angle (x4) comprised between around +90.degree. and +100.degree., and in that in said second configuration it is inclined by a fifth angle (x5) comprised between around +95.degree. and +120.degree..
30. The displacement system (1) according to claim 29, wherein said displacement means (4) are configured in such a way to act on said backrest structure (12) so that when said displacement system (1) is in said third configuration said third plane (γ) is inclined with respect to said first plane (α) by a sixth angle (x6) equivalent to 180.degree..
31. The displacement system (1) according to claim 16, further comprising a legrest structure (13) constrained in rotation to said second portion (6) of said sitting portion surface, said legrest structure (13) presenting a legrest surface, for supporting the legs of a passenger, lying on a fourth plane (δ), and in that said displacement means (4) are configured in such a way to act on said legrest structure (13) so that when said displacement system (1) is in said first configuration said fourth plane (δ) is inclined with respect to said second plane (β) by a seventh angle (x7) comprised between around -90.degree. and 180.degree., and in said second configuration is inclined by a eighth angle (x8) comprised between around -90.degree. and 180.degree..
32. The displacement system (1) according to claim 31, wherein said displacement means (4) are configured in such a way to act on said legrest structure (13) so that when said displacement system (1) is in said third configuration said fourth plane (δ) is inclined with respect to said second plane (β) by a ninth angle (x9) of 180.degree..
33. The displacement system (1) according to claim 29, wherein said displacement means (4) comprise a variable length lever.
34. The displacement system (1) according to claim 30, wherein said displacement means (4) comprise a variable length lever.
35. The displacement system (1) according to claim 31, wherein said displacement means (4) comprise a variable length lever.
[0001] The present invention concerns a displacement system for a seat, in particular an airplane seat.
[0002] More precisely, the present invention concerns a system which is capable to displace a seat between a sitting configuration, a cradle configuration and a bed or extended configuration, and vice versa.
[0003] In the state of the art, the airplane seats for the business class are developed in such a way to respond to the needs of a better comfort of the passengers during long journeys. Such seats can generally assume both a raised or sitting position, wherein the sitting portion (seat) is substantially parallel to the support plane of the seat and the backrest is substantially perpendicular to the sitting portion, and a bed or extended configuration, wherein the backrest is rotated in such a way to be positioned substantially on the same plane of the sitting portion so as to form a bed.
[0004] Moreover, some of such seats of the prior art are able to assume also an intermediate configuration, between the sitting configuration and bed configuration, wherein the sitting portion is inclined in such a way to present the front portion of the sitting portion raised with respect to the back portion of the sitting portion and the backrest reclined with respect to the seat. Such a configuration is generally termed "cradle" and allows the passenger to assume a position that is more relaxed, having the back lied down and the legs slightly raised.
[0005] However, from an ergonomic point of view, in the cradle configuration the weight of the passenger tends to rest on the pelvis and this entails, in the long run, postural pains.
[0006] Therefore, it is object of the present pension to solve the postural problems during the cradle configuration of the prior art seats in such a way to allow a better sitting ergonomics of the passenger.
[0007] It is subject matter of the present invention a displacement system for a seat, in particular an airplane seat, said seat comprising a sitting portion, a backrest and a legrest, said displacement system comprising a support structure for the support of said seat, a sitting portion structure for the support of said sitting portion, said a sitting portion structure being connected to said support structure and comprising a sitting portion surface lying at least on a first plane, and displacement means acting at least on said sitting portion structure in such a way that said displacement system passes between a first configuration or sitting configuration and at least a second configuration or cradle configuration and vice versa, said displacement system being characterised in that said sitting portion surface is subdivided into at least two sitting portions, a first portion or back portion, lying on said first plane, and a second portion or front portion, lying on a second plane, said portions being constrained in rotation with each other in the passage between said first configuration to said at least a second configuration, and vice versa, said displacement means being configured in such a way to act on said second portion so that in said first configuration said second plane is inclined with respect to said first plane by a first angle substantially of 180°, and in said at least a second configuration is inclined by a second angle positive and smaller than 180°.
[0008] Moreover, according to the invention said displacement means can be configured in such a way to act on said second portion so that in said at least a second configuration said second plane is inclined with respect to said first plane by said second angle comprised between around +175° and +120°.
[0009] Always according to the invention, said first portion can have a depth that is substantially the half of said second portion, in such a way to ergonomically support, during the use, the pelvis of a passenger.
[0010] Still according to the invention said displacement means can be configured in such a way to act on said second portion so that said displacement system is able to pass between said first configuration, said at least a second configuration and a third configuration or bed configuration, and in that said displacement means are configured in such a way that in said third configuration said second plane is inclined with respect to said first plane by a third angle substantially equivalent to 180°.
[0011] Further according to the invention, said displacement means may comprise at least a lever hinged in a first end in said support structure and in the second end in said second portion of said sitting portion surface.
[0012] Preferably according to the invention said support structure may comprise a fixed part and a movable part that is movable with respect to said fixed part, said movable part being integrally connected to said first portion of said sitting portion surface and in that said displacement means are configured in such a way to act on said movable part so that it moves in a front/back direction in the passage between said first configuration and said at least a second configuration and vice versa.
[0013] In particular, according to the invention, said first plane whereon said first portion lies, in the passage between said first configuration and said at least a second configuration, and vice versa, may be constrained in a linear trajectory.
[0014] Moreover, according to the invention, said fixed part may comprise at least a first sliding guide and at least a second sliding guide, in that said movable part is adapted to slide in said at least a first sliding guide, and in that said first end of said lever is adapted to slide in said at least a second sliding guide.
[0015] More in particular according to the invention, said at least a first sliding guide may be a linear guide.
[0016] Still according to the invention, said at least a second sliding guide may be substantially shaped in the form of a "V" in such a way to present a first portion sloping down downwards and a second portion sloping down upwards, such to provoke the tilting movement of said second portion.
[0017] Always according to the invention, said displacement system may comprise a backrest structure constrained in rotation to said first portion of said sitting portion surface, said backrest structure presenting a backrest surface, for the support, during the use, of the back of a passenger, lying on a third plane, and in that said displacement means are configured in such a way to act on said backrest structure so that when said displacement system is in said first configuration said third plane is inclined with respect to said first plane by a fourth angle comprised between around +90° and +100°, and in that in said second configuration it is inclined by a fifth angle comprised between around +95° and +120°.
[0018] Further according to the invention, said displacement means may be configured in such a way to act on said backrest structure so that when said displacement system is in said third configuration said third plane is inclined with respect to said first plane by a sixth angle equivalent to 180°.
[0019] Moreover according to the invention, the displacement system according to the invention may further comprise a legrest structure constrained in rotation to said second portion of said sitting portion surface, said legrest structure presenting a legrest surface, for supporting the legs of a passenger, lying on a fourth plane, and in that said displacement means are configured in such a way to act on said legrest structure so that when said displacement system is in said first configuration said fourth plane is inclined with respect to said second plane by a seventh angle comprised between around -90° and 180°, and in said second configuration is inclined by a eighth angle comprised between around -90° and 180°.
[0020] Preferably according to the invention, said displacement means may be configured in such a way to act on said legrest structure so that when said displacement system is in said third configuration said fourth plane is inclined with respect to said second plane by a ninth angle of 180°.
[0021] Finally according to the invention said displacement means may comprise a variable length lever.
[0022] The invention will be now described by way of illustration but not by way of limitation, with particular reference to the drawings of the enclosed figures, wherein:
[0023] FIG. 1 shows a rear perspective view of a displacement system for a seat according to the invention in the sitting configuration;
[0024] FIG. 2 shows a lateral view of the displacement system of FIG. 1;
[0025] FIG. 3 shows a front perspective of the displacement system of FIG. 1;
[0026] FIG. 4 shows a rear prospective view of the displacement system of FIG. 1 in the cradle configuration;
[0027] FIG. 5 shows a lateral view of the displacement system of FIG. 4;
[0028] FIG. 6 shows a front perspective view of the displacement system of FIG. 4;
[0029] FIG. 7 shows a rear prospective view of the displacement system of FIG. 1 in the bed configuration;
[0030] FIG. 8 shows a lateral view of the displacement system of FIG. 7; and
[0031] FIG. 9 shows a front prospective view of the displacement system of FIG. 7.
[0032] Making reference to FIGS. 1-9, it is observed the displacement system for a seat, in particular an airplane seat, according to the invention, indicated with the reference number 1.
[0033] It is clear that the present invention can be applied both to airplane seats and seats for other transportation means, such as for example trains, buses and ships, or to seats suitable to be utilised in waiting rooms of airports, stations or others, without thereby falling outside the scope of the present invention, wherein the main focus is in the improvement of the comfort of the user accommodated in the seat.
[0034] In the present text, reference will be made to the back portion of the seat, corresponding to the portion positioned in correspondence to the back of the possible passenger that is seated on the seat, the front portion of the seat, corresponding to the portion positioned in correspondence of the legs of the possible passenger seated on the seat, and the lateral positions, which find themselves in correspondence of the arms of the possible passenger seated on the seat.
[0035] A seat normally comprises a sitting portion (seat), a backrest and a legrest. In the enclosed figures the displacement system 1 according to the invention is shown, comprising the support structures of each component of a seat and, in particular, a support structure 2 for the seat support, lying on a plane or support surface, such as for example the floor of an airplane, a sitting portion structure 3 for the support of the sitting portion of the seat, a structure of the backrest 12, for the support of the backrest, and a structure of the legrest 13, for the support of the legrest of the seat.
[0036] The present invention mainly concerns the displacement and configuration of the sitting portion structure 3 and, secondarily, the displacement and configuration of the structures for backrest 12 and legrest 13. For ease of illustration, in the enclosed figures an only embodiment will be shown, which comprises all these three features.
[0037] It is observed, in particular, that such a sitting portion structure 3, or sitting frame, is connected to said seat support structure 2 and presents a sitting portion surface, for the support, during the use, of a passenger, subdivided into two portions 5 and 6. A first portion or back portion 5 lies on a first plane a and is adapted to support, during the use, the pelvis of a passenger, and a second portion or front portion 6 lies on a second plane β, and is adapted to support, during the use, the upper part of the legs of a passenger.
[0038] Such portions 5 and 6 are connected with each other and constrained in rotation in correspondence of the respective lateral portions, in at least a pivot point 15.
[0039] The displacement system 1 according to the invention further comprises displacement means 4 acting at least on said sitting portion structure 3 in such a way that said displacement system 1 passes from a first configuration or sitting configuration and at least a second configuration or cradle configuration and vice versa. In particular, said displacement means 4 are configured in such a way to act on said front portion 6 so that in said first configuration said second plane β is inclined with respect to said first plane α by a first angle x1 substantially of 180° (as shown in FIGS. 1-3), and in said at least a second configuration is inclined by a second angle x2 positive and smaller than 180° (as shown in FIGS. 4-6), preferably said second angle x2 is comprised between around +175° and +120°. So that the front portion 6 becomes a tilting portion.
[0040] It is to be noted that for the indication of the angles a circumference is conventionally considered, which is subdivided into an upper arch and a lower arch by a straight line formed by two planes, for example the first plane α and the second plane β, inclined of 180° with respect to each other, wherein all the angles smaller than 180° and indicated with the positive sign find themselves in the upper conference arch and wherein all the angles smaller than 180° and indicated with negative sign find themselves in the lower circumference arch.
[0041] This allows, advantageously, to separately tune the inclination of the front portion 6 and the back portion 5 of the sitting portion surface, allowing a better sitting portion ergonomics of the passenger, above all in the cradle configuration. Moreover, the displacement system according to the invention allows to reduce the absorptions of the electric actuators, because the weight of the passenger does not rest directly on them.
[0042] For an optimal ergonomic support of the pelvis of a passenger, such back portion 5 can present a length in depth that is substantially the half of the depth length of the front portion 6 of the sitting portion surface. Such depth proportion is particularly evident by the lateral views of the system 1 according to the invention, as represented in FIGS. 2, 5 and 8.
[0043] Still according to the invention, said displacement means 4 can be configured in such a way to act directly on said front portion 6 so that said displacement system 1 is able to pass from said first configuration, said at least a second configuration, which comes out to be an intermediate configuration, and a third configuration or "bed" configuration, and in such a way that in said third configuration said second plane β is inclined with respect to said first plane α by a third angle x3 substantially equivalent to 180° (as shown in the FIGS. 7-9).
[0044] This allows advantageously to restore a configuration wherein the two portions 5 and 6 are substantially coplanar for a better comfort of a passenger in the position lied down to bed.
[0045] In the particular embodiment represented in the figures, said displacement means 4 comprise two levers 9, in particular two milled elements, hinged at a first end 17 in said support structure 2 and at second end 18 in the front portion 6 of said sitting portion surface. Such levers 9 find themselves in correspondence of the lateral portions 16 of the support structure 2, however in other embodiments even an only lever 9 can be provided.
[0046] Such levers 9 allow therefore to operate the kinematic mechanism of the rotation of the front portion 6 with respect to the back portion 5 in said pivot point 15, and therefore of its tilting movement. The control and operation of said levers 9 can be carried out both mechanically, by suitable lever mechanism, or electronically.
[0047] It is evident that equivalent kinematic mechanisms fall within the scope of the present invention.
[0048] Preferably, the displacement system 1 according to the invention can also provide that said support structure 2 comprises a fixed part 7, fixed with respect to the support plane of the seat, and a movable part 8, movable with respect to said fixed part 7. Such movable part 8 comes out to be integrally connected to said back portion 5 of the sitting portion surface, such to move together with said movable part 8 and dragging also said front part 6 connected to it, although constrained in rotation. Moreover, said displacement means 4 are configured in such a way to act on said movable part 8 so that it moves in front or back direction in the passage between said first configuration (FIGS. 1-3) and said a second configuration (FIGS. 4-6) and vice versa, and possibly also said third bed configuration (FIGS. 7-9).
[0049] In the embodiments shown in the enclosed figures, a movement of the movable part 8 is shown, which is in the front direction with respect to the fixed part 7, however in other embodiments such movement can be also opposed, i.e. in the back direction, without thereby falling outside the scope of protection of the present invention.
[0050] Such movement allows the forward movement of the sitting portion structure 3 to decrease the dimensions of the seat, when the backrest of the seat is inclined, for example in the cradle position, until assuming the bed position.
[0051] In the specific embodiments shown in the figures, said fixed part 7 comprises two first sliding guides 10, preferably positioned on the external sides of said fixed part 7 of the support structure 2, and two second sliding guides 11, preferably positioned on the internal sides of said fixed part 7 of the support structure 2. Moreover, said movable part 8 has two lateral portions 16, each able to slide in the respective first sliding guide 10 of the fixed part 7. Said levers 9, moreover, have said first end 17 hinged and suitable to slide in the respective second sliding guide 11 of the first fixed part 7.
[0052] This allows, advantageously, to control at the same time the forward-backward movement of the movable part 8, and therefore of the structure or sitting frame 3, with respect to the fixed part 7 of the support structure 2 and the rotation of the front portion or tilting portion 6 of the sitting portion surface with respect to the back portion 5.
[0053] It is evident that in further embodiments, an only first 10 and an only second 11 sliding guide can be provided, in the case, for example, and only lever 9 is provided.
[0054] In particular, the displacement system 1 according to the invention can provide that said first plane α whereon said back portion 5 of the sitting portion surface lies, in the passage between said first configuration and said at least a second configuration, and vice versa, is constrained in a linear trajectory, preferably is always parallel to the support plane of the support structure 2. This allows advantageously to maintain, during the use of the seat, the pelvis of the passenger always in the same ergonomic position and to vary the inclination of the only second plane β whereon the front or tilting portion 6 of the sitting portion surface lies.
[0055] Such a solution can be obtained by using, preferably, a linear sliding guide 10, as, by the way, it is shown in the figures enclosed the present disclosure.
[0056] Further, the displacement system 1 according to the invention can have said second sliding guides 11 shaped substantially in the form of "V" in such a way to have a first back portion 20 sloping down downwards and a second front portion 19 sloping down upwards (visible, for example, in FIG. 3). This allows advantageously to obtain the tilting movement of the sitting portion structure 3 in the cradle configuration and at the same time to constrain the sliding movement of said lever 9.
[0057] As anticipated, the displacement system 1 according to the invention can further comprise both a structure of backrest 12 and a structure of legrest 13, or only one of them, connected to the main kinematic mechanism.
[0058] In particular, said backrest structure 12 is constrained in rotation to the back portion 6 of the sitting portion surface and has a backrest surface, for the support, during the use, of the back of a passenger, lying on a third plane γ. Said displacement means 4 can therefore be configured in such a way to act on said backrest structure 13 so that when said displacement system 1 is in said first configuration said third plane γ is inclined with respect to said first plane α by a fourth angle x4 comprised between around +90° and +100° (as shown in the FIGS. 1-3), and in said second configuration is inclined by a fifth angle x5 comprised between around +95° and +120° (as shown in the FIGS. 4-6).
[0059] This allows obtaining an optimal ergonomic support of the back of the passenger and at the same time an optimal ergonomic posture.
[0060] Moreover, if said third bed configuration is also provided, said displacement means 4 can be configured in such a way to act on said backrest structure 13 so that when said displacement system 1 is in said third configuration said third plane γ is inclined with respect to said first plane α by a sixth angle x6 equivalent to 180° (as shown in the FIG. 7-9).
[0061] In case also a legrest structure 13 is provided, it is constrained in rotation to said front portion 6 of the sitting portion surface, and presents a legrest surface to support the legs of a passenger, lying on a fourth plane δ. The displacement means 4 are configured in such a way to act on said legrest structure 13 so that when said displacement system 1 is in said first configuration said fourth plane δ is inclined with respect to said second plane β by a seventh angle x7 comprised between around -90° and +180° (as shown in the FIGS. 1-3), and in said second configuration is inclined by an eighth angle x8 comprised between around -90° and +180° (as shown in the FIGS. 4-6).
[0062] Moreover, if said third bed configuration is provided as well, said displacement means 4 can be configured in such a way to act on said legrest structure 13 so that when said displacement system 1 is said third configuration said fourth plane δ is inclined with respect to said second plane β by a ninth angle x9 of 180° (as shown in the FIGS. 7-9).
[0063] Finally, the displacement system 1 according to the invention, in a preferred embodiment, can provide that said displacement means 4 comprise a lever having variable length connected to the movement of opening/closure of the legrest structure 13.
[0064] In the foregoing, preferred embodiments have been described and variations of the present invention have been suggested, but it is to be understood that those skilled in the art will make changes and modifications without thereby falling outside the relevant scope of protection, as defined by the enclosed claims.
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