Armrest system

Abstract

Armrest system (10) for a chair (100), comprising an armrest (12) having a post (20) extending in a substantially vertical longitudinal direction (L) and a support element (14) extending transversely to said post and on which a user can rest their elbow; and a plate (40) comprising an opening (42) defining a housing (44) configured to receive said armrest post for mounting said plate to said post, said plate being locked transversely to said post by cooperation of form between said housing and said post.

Description

Domaine Technique

[0001] The present invention relates to the technical field of chairs, particularly medical chairs, and more specifically to the technical field of armrests for such chairs. Chairs are traditionally equipped with one or two armrests. Armrests generally comprise a vertically extending post and a support element extending transversely to the post, on which the user can rest their elbow. Technique antérieure

[0002] A user may need to remain seated in a chair for extended periods. In particular, during hospitalization, the patient may spend many hours in the chair. For the user's comfort, it is therefore essential to have useful items within easy reach. Useful items include, for example, a mobile phone, a remote control, medication, or any other everyday essentials. It can also be particularly important to have medical devices such as IV bags or communication tools like emergency call systems readily available near the user.

[0003] It is known to mount trays on the armrest supports of armchairs. These trays can be pivotally mounted on the supports between a usable position, in which the tray extends horizontally in front of the seated user, and a stowed position, in which the tray extends vertically to the side of the chair. A drawback of these trays, according to the prior art, is that they compromise the use of the armrest to which they are mounted, as the tray prevents the user from properly resting their elbow on the support. Furthermore, in the usable position, these trays are particularly bulky and may restrict the user's movements. These trays therefore detract from the user's comfort.

[0004] Furthermore, these swivel trays must be moved into the storage position to allow the user to get out of the chair. Therefore, these swivel trays do not allow the user to leave their belongings in place when leaving the chair, which is particularly inconvenient.

[0005] Finally, these trays provide a support surface that may prove insufficient.

[0006] US 2003 / 227208 A1 describes an armrest system comprising a tray. Exposé de l'invention

[0007] One aim of the present invention is to provide an armrest system that remedies the aforementioned drawbacks.

[0008] To this end, the invention relates to an armrest system for an armchair, said system comprising: an armrest having a post extending in a substantially vertical longitudinal direction and a support element extending transversely through said post and on which a user can rest their elbow; and a tray comprising an opening through the tray defining a housing configured to receive said armrest post for mounting said tray to said post, said tray being locked transversely to said post by cooperation of form between said housing and said post.

[0009] The armrest system according to the invention is particularly suitable for equipping medical chairs. The armrest preferably comprises said upright and said support element.

[0010] The longitudinal direction of the upright can be vertical or slightly inclined from the vertical.

[0011] Without limitation, the amount may consist of a single coin or, alternatively, of several coins cooperating with each other.

[0012] The upright cooperates with the support element. The upright is configured to support said support element. The upright advantageously has a first end portion configured to be fixed to the frame of a chair and a second end portion, opposite the first end portion and configured to cooperate with said support element. Said second end portion of the upright is advantageously fixed to said support element.

[0013] Preferably, the said amount includes at least one rod. The said rod is advantageously made of metallic material.

[0014] The support element advantageously extends substantially horizontally. The support element advantageously extends along a longitudinal axis that is transverse to the longitudinal direction of the upright. The support element advantageously comprises a frame surrounded by a padded comfort layer. The support element advantageously has a length of between 20 and 50 centimeters. The support element advantageously has a width of between 3 and 10 centimeters. The width of said support element is sufficient to allow the user to rest their elbow on it.

[0015] The armrest is advantageously configured to allow height adjustment of the support element.

[0016] The tray is advantageously flat. The tray is advantageously in the shape of a plate. The tray is preferably rigid.

[0017] The opening passes through the tabletop. Therefore, when the tabletop is mounted to the armrest upright, the upright extends through the tabletop. The opening is advantageously formed directly in the tabletop. The upright advantageously has a mounting portion configured to extend within the tabletop's recess when the tabletop is mounted to the upright, this mounting portion being in conformity with the recess. The opening is advantageously formed near an edge of the tabletop. The tabletop advantageously has a support portion extending transversely with respect to the longitudinal direction of the upright when the tabletop is mounted to the upright.

[0018] By "cooperation of form," it is understood that the housing, formed by the opening of the tabletop, and the armrest upright have corresponding, specific shapes designed to cooperate with each other. When the tabletop is mounted to the armrest upright, said upright is at least partially in contact with an inner edge of the housing.

[0019] Given this cooperation of form, at each of the points of contact between the upright and the inner edge of the housing, the upright constitutes a stop blocking the translation of the tray in a plane transverse to the longitudinal direction of the upright, as well as the inclination and tilting of the tray relative to this plane.

[0020] In other words, by cooperation of form, the upright blocks the movement of the platform transversely to the longitudinal direction of the upright, as well as the inclination and tilting of the platform with respect to said plane transverse to the longitudinal direction of the upright.

[0021] According to the invention, this form-based cooperation holds the tray in a plane transverse to the longitudinal direction of the upright. Objects can therefore be placed on the tray without fear of them slipping and falling. The form-based cooperation between the upright and the tray housing allows the tray to be held in a plane that is substantially horizontal or slightly inclined relative to the horizontal.

[0022] Preferably, the tray is secured perpendicularly to the upright by a form-matching mechanism between the tray's housing and the upright. Preferably, the tray extends in a plane perpendicular to the upright when mounted to the upright.

[0023] The armrest system tray according to the invention provides an additional support surface where the user can place objects, thus increasing the chair's support capacity. This tray also allows for the installation of additional devices, including medical devices. For example, the tray can serve as a support for an IV pole or an emergency call system.

[0024] When mounted on the armrest, the tray extends to the side of the chair. Its compact design allows the user to rest their elbow comfortably on the armrest. This ensures the tray is not inconvenient and enhances user comfort. Furthermore, the tray does not need to be folded away when the user wishes to leave the chair. It remains horizontal to the armrest, allowing the user to leave any items on it even when they are seated.

[0025] Furthermore, an advantage of this form-fitting arrangement between the upright and the tray housing is that no additional locking piece, fastener, or special tool is required to mount the tray to the upright and secure it transversely to the upright's longitudinal axis. This reduces the manufacturing costs of the armrest system and simplifies the tray's attachment to the armrest. Additionally, cleaning the armrest system is easier due to the reduced number of parts.

[0026] Preferably, through a form-based cooperation, the tray is also prevented from rotating relative to the upright around said longitudinal direction. Preferably, the form-based cooperation between said upright and the tray housing allows translation of the tray relative to the upright along said longitudinal direction of the upright.

[0027] Preferably, the shape of the housing in the platform is similar to the shape of the cross-section of the upright, considered in a plane perpendicular to the longitudinal direction of the upright. Preferably, the dimensions of the housing are slightly larger than the dimensions of the cross-section of the upright considered in the plane perpendicular to the longitudinal direction of the upright.

[0028] Preferably, the tray is configured to be mounted to the armrest upright in a removable manner.

[0029] Advantageously, the armrest upright comprises a mounting base and a sliding rod mounted relative to the mounting base along the longitudinal direction, the platform being mounted to the mounting base. One advantage is that it allows height adjustment of the support element by adjusting the relative position of the sliding rod with respect to the mounting base. It is understood that the platform is mounted to the fixed part of the upright, which is the mounting base.

[0030] Cleverly, the mounting base allows the sliding mounting of the movable rod for adjusting the height of the support element, but also the mounting of the tray to the armrest.

[0031] The mounting base and the movable rod extend along the longitudinal direction of the upright. The mounting base advantageously has a cross-section, viewed perpendicular to the longitudinal direction of the upright, that is larger than the cross-section of the movable rod. The mounting base is advantageously configured to receive the movable rod.

[0032] The tray housing is then in a form-compatible configuration with the armrest mounting base. The housing formed by the tray opening and the armrest mounting base have corresponding, specific shapes designed to work together to secure the tray transversely to the longitudinal direction of the armrest.

[0033] When mounted on the mounting base, the platform extends transversely to said mounting base.

[0034] Preferably, the mounting base is configured to be fixed to the chair frame. Preferably, the movable rod has a first end portion that slides inside the mounting base and a second end portion to which the armrest support element is attached.

[0035] Advantageously, the cross-section of the mounting base, viewed in a plane perpendicular to the longitudinal direction of the upright, corresponds to the shape of the tray housing viewed in that plane. This is particularly advantageous because it secures the tray more effectively transversely to the longitudinal direction of the upright. It also prevents any tilting or inclination of the tray relative to a plane transverse to the upright in which it extends.

[0036] In other words, the mounting base has a section, considered in said plane perpendicular to the longitudinal direction of the upright, whose shape is substantially identical to the shape of the housing considered in this plane.

[0037] Advantageously, the mounting base has a rear face extending parallel to the longitudinal direction, and the platform has at least one rear portion in contact with the rear face of the mounting base. The interaction between the rear portion and the rear face of the mounting base prevents the platform from pivoting about an axis formed by the intersection of the rear face of the mounting base and a plane transverse to the longitudinal direction of the upright. One advantage of this is preventing the platform from tilting forward.

[0038] The platform advantageously features a front portion. The front portion advantageously has dimensions greater than the dimensions of the rear portion.

[0039] The said rear face of the mounting base is advantageously flat.

[0040] Preferably, the rear portion of the platform comprises a first wing and a second wing, the first wing contacting a first lateral edge of the rear face of the mounting base, while the second wing contacts a second lateral edge of the rear face of the mounting base, the first and second wings being spaced apart. The platform therefore does not completely surround the upright. One advantage is a reduction in the platform's weight. Furthermore, given the distance between the first and second wings, it is possible to detach the platform from the upright by passing the upright, preferably the movable rod, through the space between the first and second wings. The platform can thus be removed.

[0041] The space formed between the first and second wings defines a notch in the plate leading into said opening. In other words, said first and second wings are separated by said notch.

[0042] Advantageously, the movable rod has at least one width, the distance between the first and second wings being greater than said width. The distance between the first and second wings is understood to be the smallest distance separating them. The width of the upright is considered perpendicular to its longitudinal direction. The tabletop can therefore be removed from the upright by extracting the movable rod from its housing through the space between the two wings, preferably after first moving the tabletop translationally along the longitudinal direction of the upright to bring it into alignment with the movable rod.

[0043] Preferably, the distance between the first and second wings is greater than the greatest width of the movable stem.

[0044] Preferably, the mounting base has a curved front face extending along the longitudinal direction, and the tray housing includes a curved inner edge portion cooperating with the front face of the mounting base. One advantage is that this more effectively secures the tray transversely to the longitudinal direction of the upright. The curvature of the curved inner edge portion advantageously follows the curvature of the front face of the mounting base. This prevents the tray from tilting backward.

[0045] According to an advantageous aspect, the mounting base comprises a rack portion with alternating notches and grooves, and the movable rod comprises at least one locking member configured to engage with the grooves of the rack portion to prevent the sliding of the movable rod relative to the mounting base. An advantage is the ability to adjust the height of the support element by moving the movable rod relative to the mounting base, so as to engage the locking member with one or the other of the grooves in the rack portion. Each of the grooves in the rack portion is associated with an axial position of the movable rod, considered along the longitudinal direction of the upright, relative to the mounting base. The locking member advantageously cooperates with an elastic return member configured to maintain the locking member engaged in one of the grooves of the rack portion.

[0046] Preferably, the notches of the rack portion have at least one inclined surface, the locking member being configured to slide on said inclined surface when moved along said longitudinal direction of the upright. One advantage is that this allows the locking member to move from one notch to another, and thus the locking mechanism to be engaged in different positions of the moving rod relative to the mounting base, by moving the moving rod along the longitudinal direction.

[0047] Preferably, the housing has a longitudinally truncated oblong shape. In other words, the housing has an oblong shape with a cutout parallel to a longitudinal direction of this oblong shape. Preferably, the cutout is formed at approximately two-thirds of the width of this oblong shape. Preferably, the mounting base of the upright has a cross-section, viewed in a plane perpendicular to the longitudinal direction of the upright, which also has a longitudinally truncated oblong shape.

[0048] Preferably, the said tray is mounted to slide relative to the said armrest upright, along the said longitudinal direction. One advantage is that it allows the tray to be removed from the upright, for example by bringing it into alignment with the movable rod.

[0049] Advantageously, the armrest support includes at least one transverse stop element against which the tabletop is configured to rest, in order to limit downward sliding of the tabletop relative to the support along the longitudinal direction. One benefit is maintaining the tabletop at a chosen height. Preferably, this at least one transverse stop element is positioned to maintain the tabletop at approximately the height of the chair seat. The tabletop rests against this stop element and is held at the corresponding height by the stop element that supports it.

[0050] The transverse stop element advantageously has the shape of a lug. Preferably, the mounting base includes the transverse stop element. The stop element preferably projects transversely from said mounting base, and even more preferably from the rear face of the mounting base.

[0051] Preferably, the mounting base and the transverse stop element form a single piece.

[0052] Preferably, the assembly includes a first transverse stop element and a second transverse stop element, the first wing of the platform being configured to bear on the first transverse stop element while the second wing of the platform is configured to bear on the second transverse stop element.

[0053] Preferably, the mounting base includes a first transverse stop element projecting from a first lateral edge of the rear face of the mounting base and a second transverse stop element projecting from a second lateral edge of the rear face of the mounting base.

[0054] Preferably, the tabletop is configured to be mounted to the upright in a removable manner. One advantage is the ability to disassemble the tabletop for storage when not in use. Ideally, the tabletop can be disassembled without tools.

[0055] Preferably, the platform is configured to be mounted to the mounting base in a removable manner.

[0056] Advantageously, the armrest system also includes an IV pole mounted on the platform. This IV pole is configured to hold a bag, for example, an infusion bag. One benefit is that the platform can also be used as a support for such an IV pole, thus allowing a bag to be kept close to the user without the need for a separate, freestanding IV pole attached to the chair.

[0057] Preferably, the armrest system further includes a communication system equipped with at least one element chosen from an emergency call button, a microphone, a camera, and a speaker.

[0058] The invention also relates to an armchair, for example a medical chair, comprising at least one armrest system as described above. Brève description des dessins

[0059] The invention will be better understood upon reading the following description of embodiments of the invention given by way of non-limiting examples, with reference to the accompanying drawings, in which: [ Fig. 1 ]there figure 1 is a perspective view of a first embodiment of an armrest system according to the invention; [ Fig. 2 ]there figure 2 illustrates the armrest system of the figure 1 , the platform having been dismantled; Fig. 3 ]there figure 3 is a cross-sectional, top view of the armrest system of the figure 1 , the platform being mounted to the upright; Fig. 4 ]there figure 4 is a cross-sectional, top view of the armrest system of the figure 1 , the platform being disassembled; [ Fig. 5 ]there figure 5 is a cross-sectional view of the mounting base of the armrest system of the figure 1 ; Fig. 6 ]there figure 6 is a perspective view of the platform mounted to the base of the armrest system mounting bracket figure 1 ; Fig. 7 ]there figure 7 is a side view of the armrest system of the figure 1 , the platform being mounted to the mounting base; [ Fig. 8 ]there figure 8 is a side view of the armrest system of the figure 1 , during the dismantling of the tray; [ Fig. 9 ]there figure 9 shows an armchair according to the invention, comprising two armrest systems according to the figure 1 ; And [ Fig. 10 ]there figure 10 illustrates a second embodiment of an armrest system according to the invention. Description des modes de réalisation

[0060] The invention relates to an armrest system for a chair and to a chair, in particular a medical chair, comprising such an armrest system.

[0061] There figure 1 is a perspective view of an initial embodiment of an armrest system 10 according to the invention. On this figure 1 , We observe that the armrest system includes an armrest 12. The armrest 12 includes a support element 14 on which a user can rest and support their elbow. The armrest 12 includes in addition an amount 20 extending along a longitudinal direction L which in this non-limiting example is substantially vertical. The support element 14 is fixed to said amount and extends transversely to the amount and in the longitudinal direction L. The support element 14extends substantially horizontally. The support element comprises a reinforcement and a comfort layer surrounding the reinforcement.

[0062] The amount 20 includes a movable rod 22 and a mounting base 24. The movable rod 22 is mounted to slide relative to said mounting base 24 along said longitudinal direction L. The mounting base 24 is configured to be attached to the frame of a wheelchair via a fixing piece 26. The mounting base 24 forms a first end part of the upright.

[0063] The movable rod 22 presents a first end portion 22a sliding mount inside the mounting base 24. The mounting base has a cavity 28 within which extends the first end portion 22a of the movable rod 22. The movable rod22 It also features a second end portion 22b, opposite to the first end portion 22a, and forming a second end piece for the upright. The support element 14 is attached to this second end portion 22b of the movable rod 22.

[0064] As illustrated in figure 3 , the mounting base 24 presents a front 30 curve, extending parallel to the longitudinal direction L the amount 20, and a back 32 plane, visible in figure 6 , extending also parallel to the longitudinal direction L.

[0065] THE figures 3 et 4 are cross-sectional views of the amount 20 and the plateau 40 considered in a plan P perpendicular to the longitudinal direction L the amount 20.These figures show that the mounting base 24 presents a section, considered in the plan P, having an oblong shape truncated longitudinally, that is to say, presenting a cut parallel to a longitudinal direction I1 of this oblong shape. This truncation or cut defines the back face 32 of the mounting base 24.

[0066] There figure 5 is a cross-sectional view of the upright 20 along a vertical plane. On this figure 5 , we observe that the mounting base 24 presents a portion of rack 34 formed inside the cavity 28. This section of the rack 34 includes an alternation of notches 35 and hollows 36. Furthermore, the movable rod 22 includes a locking mechanism 38. The locking mechanism 38 includes an axial rod 33extending inside the movable stem 22 and a finger 39 attached to the said axial rod 33. The finger extends through an opening formed in a lateral wall of the movable rod. The finger extends transversely relative to the movable rod. 22 and to the longitudinal direction L the amount 20. The finger 39 is configured to engage alternately with the hollows 36 of the rack section 34 to block the sliding of said movable rod 22 in relation to said mounting base 24. One advantage is that it allows the height of the support element to be adjusted. 14.

[0067] The locking mechanism 38 it also cooperates with an elastic return mechanism 37 arranged in the cavity 28 of the mounting base 24. This elastic return mechanism 37It has the shape of a spring blade. The elastic return mechanism 37 is configured to exert a restoring force on the locking mechanism 38 which tends to hold the finger 39 engaged in a hollow 36 of the rack section 34 for locking the position of the movable rod 22 compared to the mounting base 24.

[0068] The notches 35 of the rack section 34 each includes an inclined surface 35a over which the finger slides 39 of the locking mechanism 38 when the movable rod 22 is displaced along the longitudinal direction L, upwards, until said finger 39 is brought into the next hollow. In other words, at each of the hollows 36 is associated with an axial position, considered along the longitudinal direction L, of the movable rod 22 compared to the mounting base24.

[0069] According to the invention, the armrest system 10 also includes a tray 40 configured to be mounted on the upright 20, and more specifically at the mounting base 24 the amount 20. As illustrated on the figure 2 , in which it is disassembled, the tray 40 It has the shape of a plate. It is preferably made of plastic material. The tray 40 is flat. It has a front edge 40a and a rear edge 40b.

[0070] An opening 42 is provided in the plateau 40. The opening 42 is cut directly into the tray. This opening 42 defines a dwelling 44 configured to receive the mounting base 24 the amount 20. In other words, as illustrated in figure 1 , when the plateau 40 has risen to the amount20, the mounting base 24 extends inside the dwelling 44. As illustrated in figure 4 , the accommodation 44 presents a shape similar to the shape of the mounting base section 24 considered in the plan P perpendicular to the longitudinal direction L the amount 20. In other words, the cross-section of the mounting base 24, considered in the plan P perpendicular to the longitudinal direction L the amount 20, corresponds to the shape of the dwelling 44 of the plateau 40. More specifically, this accommodation 44 It also has an oblong shape truncated longitudinally. The housing 44 features an inner border 46 featuring in particular a portion of curved inner edge 47.

[0071] The accommodation 44presents transverse dimensions, considered in said plane P, which are slightly larger than the dimensions of the mounting base section 24 considered in said plan P, so as to allow the mounting base to be introduced into said housing 44. The plateau 40 is thus mounted sliding relative to the mounting base 24 along the longitudinal direction L.

[0072] According to the invention, when it is mounted on the upright 20, and especially at the assembly base 24, said plateau 40 is blocked across said amount 20 by formal cooperation between the said accommodation 44 and the said amount 20. More specifically, the accommodation 44 is in cooperation in form with the mounting base 24, by which said plateau 40is held transversely to the mounting base and in the longitudinal direction L the amount 20.

[0073] The accommodation 44 of the plateau 40 and the mounting base 24 of the armrest 12 have corresponding particular shapes designed to cooperate with each other. When the plateau 40 is mounted to said mounting base 24, said mounting base 24 is at least partially in contact with the inner edge 46 said accommodation.

[0074] Given this formal cooperation, the assembly base 24 defines a plurality of stops blocking the translation of the platform 40 in a plane transverse to the longitudinal direction L the amount 20, as well as the inclination and tilt of the platform relative to this plane. In this non-limiting example, through cooperation of form, the platform 40is stuck in the plan P perpendicular to the longitudinal direction L of the mounting base 24, which is here a horizontal plane, as can be seen in figures 1 And 4 . Therefore, objects can be placed on the platform without risk of them falling.

[0075] The invention eliminates the need for additional assembly parts to assemble the tray 40 to the amount and to maintain it transversely to the longitudinal direction L of the amount. In addition, the tray 40 can be mounted to the upright and mounting base without tools.

[0076] As can be seen in figure 6 , the plateau 40 presents a rear portion 48 configured to come into contact with the rear 32 of the mounting base. In this non-limiting example, the rear portion 48 of the plateau 40includes a first wing 50 and a second wing 52 visible in figure 6 These first and second wings 50,52 define said rear portion 48 of the plateau 40. The first and second wings 50,52 They partially surround the mounting base. They are configured to come into contact with the rear face 32 of the mounting base 24, in order to prevent the platform from tipping over 40 forward. The first and second wings 50,52 define a portion of the right rear border 49 for housing 44, illustrated in figure 4 .

[0077] The mounting base 24 It also includes a first transverse stop element 54 projecting from a first lateral edge 32a of the back 32 of the mounting base 24, transversely to the longitudinal directionL the amount 20. The mounting base 24 It also includes a second transverse stop element 56 projecting from a second lateral edge 32b of the back 32 of the mounting base 24, transversely to the longitudinal direction L the amount 20.

[0078] As illustrated in figure 6 , the first wing 50 of the plateau 40 is configured to bear against the first transverse stop element 54, while the second wing 52 is configured to bear against the second transverse stop element 56, in order to block the movement of the platform 40 along said longitudinal direction L From the top down. Cooperation between the wings 50,52 and the first and second transverse stop elements 54,56This allows the platform to be maintained at a predetermined height.

[0079] As illustrated in the side view of the figure 7 , the first and second wings 50,52 are separated from each other by a distance D. In other words, a space E is defined between the first and second wings, forming a notch in the plate, which opens into the opening 42, as can be seen in figure 4 . This distance D is greater than a larger width d of the movable rod 22. One advantage is that it allows the tray to be disassembled. 40 relative to the moving rod 22. To do this, as illustrated in figure 8 , the plateau 40 is displaced in translation along the longitudinal direction L the amount 20, upwards, in order to bring it into line with the movable rod 22. The plateau 40can then be disassembled by passing the movable rod 22 in space E defined between the first and second wings 50,52. The plateau 40 is therefore mounted in a removable manner to the mounting base 24 and the amount 20.

[0080] There figure 9 illustrates an armchair 100 including two armrest systems 10 according to the invention, arranged on either side of the seat 102 of the armchair. In this example, the armchair 100 is a medical chair. We observe that the armrest system 10 according to the invention allows the tray to be held 40 approximately horizontally, at seat height 102 of the armchair 100.

[0081] The armchair 100 includes a chassis 104. Armrest systems 10 are attached to the chassis 104 via fasteners 26. The plateau40 It forms a support for placing various objects such as a remote control, a mobile phone, or medication. The tray 40 It can also serve as a support for an IV pole carrying, for example, an infusion bag. The tray 40 It can also support an emergency call system.

[0082] There figure 10 is a perspective view of a second embodiment of an armrest system 10 according to the invention. In this second embodiment, the tray 40 is small in size and has a support portion 41 in which an opening is provided 43. This opening 43 is configured to receive a serum stem 45 for the assembly of this IV pole, said tray 40. This IV pole has a hook at its end to support an infusion bag, for example.

[0083] This serum holder stem 45 It can also be equipped with a nurse call button.

Claims

1. An armrest system (10) for an armchair (100), said system comprising: - an armrest (12) having an upright (20) extending in a substantially vertical longitudinal direction (L) and a support element (14) extending transversely to said upright and on which a user can rest his elbow; and - a tray (40) comprising an opening (42) passing through the tray and defining a housing (44) configured to receive said armrest upright for mounting said tray to said upright, said tray being blocked transversely to said upright by shape cooperation between said housing and said upright.

2. The armrest system according to claim 1, wherein said armrest (12) upright (20) comprises a mounting base (24) and a movable rod (22) slidably mounted with respect to said mounting base in said longitudinal direction (L), said tray (40) being mounted to said mounting base.

3. The armrest system according to claim 2, wherein the cross-section of the mounting base (24), considered in a plane (P) perpendicular to the longitudinal direction (L) of the upright (20), corresponds to the shape of the housing (44) of the tray (40) considered in said plane.

4. The armrest system according to claim 2 or 3, wherein said mounting base (24) has a rear face (32) extending parallel to said longitudinal direction (L) and wherein said tray (40) has at least one rear portion (48) coming into contact with said rear face of the mounting base.

5. The armrest system according to claim 4, wherein said rear portion (48) of the tray (40) comprises a first wing (50) and a second wing (52), said first wing contacting a first side edge (32a) of said rear face (32) of the mounting base (24) while the second wing contacts a second side edge (32b) of the rear face of the mounting base, said first and second wings being spaced apart from one another.

6. The armrest system according to claim 5, wherein said movable rod (22) has at least one width (d), the distance (D) between the first and second wings (50, 52) being greater than said width.

7. The armrest system according to any one of claims 2 to 6, wherein said mounting base (24) has a curved front face (30) extending in said longitudinal direction (L), and wherein the housing (44) of the tray (40) comprises a curved inner border (47) cooperating with said front face of the mounting base.

8. The armrest system according to any one of claims 2 to 7, wherein said mounting base (24) comprises a rack portion (34) comprising alternating notches (35) and recesses (36), and wherein said movable rod (22) comprises at least one locking member (38) configured to engage with the recesses of the rack portion to block sliding of said movable rod with respect to said mounting base.

9. The armrest system according to any one of claims 1 to 8, wherein said housing (44) has a longitudinally truncated oblong shape.

10. The armrest system according to any one of claims 1 to 9, wherein said tray (44) is slidably mounted with respect to said upright (20) of the armrest (12), in said longitudinal direction (L).

11. The armrest system according to claim 10, wherein the upright (20) of the armrest (12) comprises at least one transverse stop element (54, 56) on which the tray (40) is configured to come to bear, in order to limit the sliding, downwards, of the tray with respect to said upright (20) in said longitudinal direction (40).

12. The armrest system according to any one of claims 1 to 11, wherein said tray (40) is configured to be removably mounted to the upright (20).

13. The armrest system according to any one of claims 1 to 12, further comprising an IV pole (45) mounted to said tray (40).

14. The armrest system according to any one of claims 1 to 13, further comprising a communication system provided with at least one element selected from an emergency call button, a microphone, a camera, and a speaker.

15. An armchair (100), for example a medical armchair, comprising at least one armrest system (10) according to any one of claims 1 to 14.

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