Armrest system

Abstract

Armrest System. An 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 secured transversely to said post by a form-matching arrangement between said housing and said post. Figure for the abbreviation: Fig. 1.

Description

Title of the invention: Armrest system technical field

[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. Previous technique

[0002] A user may have to remain seated in a chair for a significant period of time. In particular, during hospitalization, the patient may be required to occupy the chair for many hours. For the user's comfort, it is therefore necessary to have useful items within easy reach. Useful items include, for example, a mobile phone, a remote control, medication, or any other commonly used item. It can also be particularly important to be able to position medical devices such as IV bags or communication tools such as emergency call systems near the user.

[0003] It is known to mount trays on the support elements of chair armrests. These trays can, in particular, be pivotally mounted on the support elements 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 disadvantage 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 element. Furthermore, in the usable position, these trays are particularly bulky and may hinder the user's movements. These trays therefore impair user 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 platforms provide a support surface which may prove insufficient. Description of the invention

[0006] One object of the present invention is to provide an armrest system that remedies to the aforementioned disadvantages.

[0007] 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 across said post, on which a user can rest their elbow; and - a plate comprising an opening defining a housing configured to receive said armrest upright for mounting said plate to said upright, said plate being blocked transversely to said upright by cooperation of form between said housing and said upright.

[0008] The armrest system according to the invention is particularly suitable for equipping medical chairs. The armrest preferably comprises said upright and said support element.

[0009] The longitudinal direction of the upright can be vertical or slightly inclined with respect to the vertical.

[0010] Without limitation, the amount may consist of a single piece or, alternatively, of several pieces cooperating with each other.

[0011] 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.

[0012] Preferably, said amount includes at least one rod. Said rod is advantageously made of metallic material.

[0013] 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.

[0014] The armrest is advantageously configured to allow height adjustment of the support element.

[0015] The tray is advantageously flat. The tray is advantageously in the shape of a plate. The tray is preferably rigid.

[0016] Said opening passes through the plate. Also, when the plate is mounted said The armrest upright extends through 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 form-fitting 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.

[0017] 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 said armrest upright, said upright is at least partially in contact with an inner edge of said housing.

[0018] 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 platform in a plane transverse to the longitudinal direction of the upright, as well as the inclination and tilting of the platform with respect to this plane.

[0019] 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.

[0020] According to the invention, through this form-based cooperation, the tray is thus held in a plane transverse to the longitudinal direction of the upright. It is therefore possible to place objects on said tray without fear of them slipping and falling off. The form-based cooperation between the upright and the tray housing allows the tray to be held in a substantially horizontal plane or one slightly inclined with respect to the horizontal.

[0021] Preferably, the tray is secured perpendicularly to the upright by a form-matching arrangement between the tray housing and said upright. Preferably, the tray extends in a plane perpendicular to the upright when mounted on said upright.

[0022] 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, particularly medical devices. In particular, the tray can serve as a support for an IV pole or an emergency call system.

[0023] When mounted on the armrest support, the tray extends along the side of the chair. It has a small footprint and does not prevent the user from resting their elbow on the support. The user is therefore not bothered by the tray, and their comfort is thus improved. Furthermore, it is not necessary to bring the tray with them. in a stowed position when the user wishes to leave the seat. The tray is therefore held transversely to the frame, even when the user wants to get out of the seat, so that they can leave the items placed on the tray.

[0024] Furthermore, an advantage of this form-based cooperation between the upright and the tray housing is that it eliminates the need for an additional locking piece, fastener, or special tool to mount the tray to the upright and secure it transversely to the upright's longitudinal direction. This reduces the manufacturing costs of the armrest system and simplifies the mounting of the tray to the armrest. In addition, cleaning the armrest system is easier due to the reduced number of parts.

[0025] Preferably, by means of a form-based cooperation, the plate is also prevented from rotating relative to the upright around said longitudinal direction. Preferably, the form-based cooperation between said upright and the plate housing allows translation of the plate relative to the upright along said longitudinal direction of the upright.

[0026] Preferably, the shape of said housing in the tray is similar to the shape of the cross-section of the upright, considered in a plane perpendicular to said longitudinal direction of the upright. Preferably, the dimensions of said housing are slightly larger than the dimensions of said cross-section of the upright considered in the plane perpendicular to said longitudinal direction of the upright.

[0027] Preferably, the tray is configured to be mounted to said armrest upright in a removable manner.

[0028] Advantageously, the armrest upright comprises a mounting base and a movable rod that slides relative to the mounting base along the longitudinal direction, the tray being mounted to the mounting base. One advantage is that it allows the height of the support element to be adjusted by changing the relative position of the movable rod with respect to the mounting base. It is understood that the tray is mounted to the fixed part of the upright, which is the mounting base.

[0029] Cleverly, the mounting base therefore 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.

[0030] 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.

[0031] The tray housing is then in a form-matched configuration with the mounting base of the armrest upright. The housing formed by the tray opening and the mounting base of the armrest upright have corresponding specific shapes. shaped to cooperate with each other in order to block the platform transversely to the longitudinal direction of the upright.

[0032] When mounted on the mounting base, the platform extends transversely to said mounting base.

[0033] Preferably, the mounting base is configured to be fixed to the chair frame. Preferably, the movable rod has a first end portion mounted to slide inside the mounting base and a second end portion to which the armrest support element is attached.

[0034] Advantageously, the cross-section of the mounting base, considered in a plane perpendicular to the longitudinal direction of the upright, corresponds to the shape of the tray housing considered in said plane. One advantage is that this more effectively secures the tray transversely to the longitudinal direction of the upright. Another advantage is that it prevents any tilting or inclination of the tray relative to a plane transverse to the upright in which it extends.

[0035] 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.

[0036] 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 is therefore preventing the platform from tilting forward.

[0037] The platform advantageously has a front portion. The front portion advantageously has dimensions greater than the dimensions of the rear portion.

[0038] Said rear face of the mounting base is advantageously flat.

[0039] Preferably, said rear portion of the platform comprises a first wing and a second wing, said first wing contacting a first lateral edge of said rear face of the mounting base, while the second wing contacting a second lateral edge of the rear face of the mounting base, said first and second wings being spaced apart. The platform therefore does not completely surround the upright. One advantage is to reduce the weight of the platform. Furthermore, given the distance between the first and second wings, it is possible to detach the platform from the upright by passing said upright, preferably the movable rod, through the space separating the first and second wings. The platform can thus be removed.

[0040] The space formed between the first and second wings defines a notch in the tray opening into said opening. In other words, said first and second wings are separated by said notch.

[0041] 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 the longitudinal direction of the upright. The platform can therefore be removed from the upright by extracting the movable rod from the housing through the space between the two wings, preferably after first moving the platform in translation along the longitudinal direction of the upright, so as to bring it into alignment with the movable rod.

[0042] Preferably, the distance between the first and second wings is greater than the greatest width of the movable rod.

[0043] 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 the tray is more effectively secured 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.

[0044] According to an advantageous aspect, said mounting base comprises a rack portion having alternating notches and grooves, and said movable rod comprises at least one locking member configured to engage with the grooves of the rack portion to prevent the sliding of said movable rod relative to said 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 in the rack portion.

[0045] Preferably, said 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 to allow the locking member to pass from one notch to another, and thus to lock the movable rod in different positions relative to the mounting base, by moving the movable rod along the longitudinal direction.

[0046] Preferably, said housing has a truncated oblong shape longitudinally 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.

[0047] Preferably, said tray is mounted to slide relative to said armrest upright, along said longitudinal direction. One advantage is to allow the tray to be removed from the upright, for example by bringing it into alignment with the movable rod.

[0048] 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 said support along said longitudinal direction. One advantage is maintaining the tabletop at a chosen height. Preferably, said at least one transverse stop element is positioned so as to maintain the tabletop substantially at the height of the chair seat. The tabletop rests against said stop element and is held at the corresponding height by said stop element which supports it.

[0049] 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, more preferably from the rear face of the mounting base.

[0050] Preferably, the mounting base and the transverse stop element form a single piece.

[0051] Preferably, the upright comprises 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.

[0052] 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.

[0053] Preferably, said tray is configured to be mounted to the upright in a removable manner. An advantage is the ability to disassemble the tray for storage when not in use. Preferably, the tray can be disassembled without tools.

[0054] Preferably, the platform is configured to be mounted to the mounting base in a removable manner.

[0055] Advantageously, the armrest system further includes an IV pole mounted on the tray. Such an IV pole is configured to hold a bag, for example, an infusion bag. One advantage is that the tray 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.

[0056] Preferably, the armrest system further comprising a communication system equipped with at least one element selected from an emergency call button, a microphone, a camera, and a speaker.

[0057] The invention also relates to an armchair, for example a medical chair, comprising at least one armrest system as described above. Brief description of the drawings

[0058] 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:

[0059] [Fig.1] [Fig.1] is a perspective view of a first embodiment of an armrest system according to the invention;

[0060] [Fig.2] [Fig.2] illustrates the armrest system of [Fig.1], the tray having been removed;

[0061] [Fig.3] [Fig.3] is a top cross-sectional view of the armrest system of [Fig.1], the tray being mounted to the upright;

[0062] [Fig.4] [Fig.4] is a top cross-sectional view of the armrest system of [Fig.1], with the tray removed;

[0063] [Fig.5] [Fig.5] is a cross-sectional view of the mounting base of the armrest system of [Fig.1];

[0064] [Fig.6] [Fig.6] is a perspective view of the plate mounted on the mounting base of the armrest system of [Fig.1];

[0065] [Fig.7] [Fig.7] is a side view of the armrest system of [Fig.1], the tray being mounted to the mounting base;

[0066] [Fig.8] [Fig.8] is a side view of the armrest system of [Fig.1], during the dismantling of the tray;

[0067] [Fig.9] [Fig.9] shows an armchair according to the invention, comprising two armrest systems according to [Fig.1]; and

[0068] [Fig.10] [Fig. 10] illustrates a second embodiment of an armrest system according to the invention. Description of the implementation methods

[0069] The invention relates to an armrest system for an armchair as well as to a armchair, in particular a medical chair, including such an armrest system.

[0070] Figure 1 is a perspective view of a first embodiment of an armrest system 10 according to the invention. In this figure 1, the armrest system comprises an armrest 12. The armrest 12 includes a support element 14 on which a user can rest their elbow. The armrest 12 further comprises a post 20 extending along a longitudinal direction L, which in this non-limiting example is substantially vertical. The support element 14 is fixed to said post and extends transversely to the post and along the longitudinal direction L. The support element 14 extends substantially horizontally. The support element comprises a frame and a comfort layer surrounding the frame.

[0071] The upright 20 comprises 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 fixed to the frame of a chair by means of a fixing piece 26. The mounting base 24 forms a first end part of the upright.

[0072] The movable rod 22 has a first end portion 22a mounted to slide inside the mounting base 24. The mounting base has a cavity 28 inside which the first end portion 22a of the movable rod 22 extends. The movable rod 22 further has a second end portion 22b, opposite the first end portion 22a, and forming a second end portion for the upright. The support element 14 is fixed to this second end portion 22b of the movable rod 22.

[0073] As illustrated in [Fig.3], the mounting base 24 has a curved front face 30, extending parallel to the longitudinal direction L of the upright 20, and a flat rear face 32, visible in [Fig.6], also extending parallel to the longitudinal direction L.

[0074] Figures 3 and 4 are cross-sectional views of the upright 20 and the platform 40 considered in a plane P perpendicular to the longitudinal direction L of the upright 20. These figures show that the mounting base 24 has a cross-section, considered in plane P, having a longitudinally truncated oblong shape, i.e., having a cutout parallel to a longitudinal direction 11 of this oblong shape. This truncation or cutout defines the rear face 32 of the mounting base 24.

[0075] Figure 5 is a cross-sectional view of the upright 20 along a vertical plane. Figure 5 shows that the mounting base 24 has a portion of a rack 34 formed inside the cavity 28. This portion of the rack 34 comprises alternating notches 35 and recesses 36. Furthermore, the movable rod 22 includes a locking member 38. The locking member 38 comprises an axial rod 33 extending inside the movable rod 22 and a finger 39 fixed to said axial rod 33. The finger extends through an opening formed in a lateral wall of the movable rod. The finger extends transversely with respect to the movable rod 22 and in the longitudinal direction L of the upright 20. The finger 39 is configured to engage alternately with the recesses 36 of the rack portion 34 to prevent the sliding of said movable rod 22 relative to said mounting base 24. One advantage is to allow adjustment of the height of the support element 14.

[0076] The locking member 38 further cooperates with an elastic return member 37 disposed in the cavity 28 of the mounting base 24. This elastic return member 37 has the shape of a leaf spring. The elastic return member 37 is configured to exert a return force on the locking member 38, which tends to keep the finger 39 engaged in a recess 36 of the rack portion 34, thus locking the position of the movable rod 22 relative to the mounting base 24.

[0077] The notches 35 of the rack portion 34 each comprise an inclined surface 35a on which the finger 39 of the locking member 38 slides when the movable rod 22 is moved upwards in the longitudinal direction L, until said finger 39 is brought into the next notch. In other words, each of the notches 36 is associated with an axial position, considered in the longitudinal direction L, of the movable rod 22 relative to the mounting base 24.

[0078] According to the invention, the armrest system 10 further comprises a plate 40 configured to be mounted on the upright 20, and more specifically on the mounting base 24 of the upright 20. As illustrated in [Fig. 2], in which it is disassembled, the plate 40 is in the form of a plate. It is preferably made of plastic. The plate 40 is flat. It has a front edge 40a and a rear edge 40b.

[0079] An opening 42 is provided in the plate 40. This opening 42 defines a recess 44 configured to receive the mounting base 24 of the upright 20. In other words, as illustrated in [Fig. 1], when the plate 40 is mounted to the upright 20, the mounting base 24 extends inside the recess 44. As illustrated in [Fig. 4], the recess 44 has a shape similar to the shape of the cross-section of the mounting base 24 considered in the plane P perpendicular to the longitudinal direction L of the upright 20. In other words, the cross-section of the mounting base 24, considered in the plane P perpendicular to the longitudinal direction L of the upright 20, corresponds to the shape of the recess 44 in the plate 40. More precisely, this recess 44 also has a longitudinally truncated oblong shape. The recess 44 has an inner edge 46, in particular a curved inner edge portion 47.

[0080] The housing 44 has transverse dimensions, considered in said plane P, which are slightly larger than the dimensions of the section of the mounting base 24 considered in said plane P, so as to allow the introduction of the base of assembly in said housing 44. The plate 40 is thus mounted sliding relative to the mounting base 24 in the longitudinal direction L.

[0081] According to the invention, when mounted on the upright 20, and in particular on the mounting base 24, said plate 40 is locked transversely to said upright 20 by cooperation of form between said housing 44 and said upright 20. More precisely, the housing 44 is in cooperation of form with the mounting base 24, whereby said plate 40 is held transversely to the mounting base and to the longitudinal direction L of the upright 20.

[0082] The housing 44 of the tray 40 and the mounting base 24 of the armrest 12 have corresponding special shapes designed to cooperate with each other. When the tray 40 is mounted to said mounting base 24, said mounting base 24 is at least partially in contact with the inner edge 46 of said housing.

[0083] Given this form cooperation, the mounting base 24 defines a plurality of stops that prevent the translation of the platform 40 in a plane transverse to the longitudinal direction L of the upright 20, as well as the inclination and tilting of the platform relative to this plane. In this non-limiting example, by means of form cooperation, the platform 40 is blocked in the plane 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. Consequently, objects can be placed on the platform without risk of them falling.

[0084] The invention eliminates the need for additional mounting parts to attach the plate 40 to the upright and to hold it transversely to the longitudinal direction L of the upright. Furthermore, the plate 40 can be mounted to the upright and the mounting base without tools.

[0085] As can be seen in [Fig. 6], the platform 40 has a rear portion 48 configured to come into contact with the rear face 32 of the mounting base. In this non-limiting example, the rear portion 48 of the platform 40 comprises a first wing 50 and a second wing 52, visible in [Fig. 6]. These first and second wings 50, 52 define said rear portion 48 of the platform 40. The first and second wings 50, 52 partially surround the mounting base. They are configured to come into contact with the rear face 32 of the mounting base 24, again to prevent the platform 40 from tilting forward. The first and second wings 50, 52 define a right rear edge portion 49 for the housing 44, illustrated in [Fig. 4].

[0086] The mounting base 24 further comprises a first transverse stop element 54 projecting from a first lateral edge 32a of the rear face 32 of the mounting base 24, transversely to the longitudinal direction L of the upright 20. The mounting base 24 further comprises a second stop element transverse 56 projecting from a second lateral edge 32b of the rear face 32 of the mounting base 24, transversely to the longitudinal direction L of the upright 20.

[0087] As illustrated in [Fig. 6], the first wing 50 of the platform 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, so as to block the downward movement of the platform 40 along the longitudinal direction L of the upright. The interaction between the wings 50, 52 and the first and second transverse stop elements 54, 56 thus makes it possible to maintain the platform at a predetermined height.

[0088] As illustrated in the side view of [Fig. 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 [Fig. 4]. This distance D is greater than a larger width d of the movable rod 22. One advantage is that it allows the plate 40 to be removed from the movable rod 22. To do this, as illustrated in [Fig. 8], the plate 40 is moved in translation along the longitudinal direction L of the upright 20, upwards, in order to bring it into alignment with the movable rod 22. The plate 40 can then be removed by passing the movable rod 22 through the space E defined between the first and second wings 50, 52. The 40 plate is therefore mounted in a removable manner to the mounting base 24 and the upright 20.

[0089] Figure 9 illustrates a chair 100 comprising two armrest systems 10 according to the invention, arranged on either side of the seat 102 of the chair. In this example, the chair 100 is a medical chair. It can be seen that the armrest system 10 according to the invention makes it possible to maintain the tray 40 substantially horizontally, at the height of the seat 102 of the chair 100.

[0090] The chair 100 comprises a frame 104. The armrest systems 10 are attached to the frame 104 by means of fasteners 26. The tray 40 forms a support for various objects such as a remote control, a mobile phone, or medication. The tray 40 can also serve as a support for an IV pole holding, for example, an infusion bag. The tray 40 can also support an emergency call system.

[0091] Figure 10 is a perspective view of a second embodiment of an armrest system 10 according to the invention. In this second embodiment, the platform 40 is smaller and has a support portion 41 in which an opening 43 is provided. This opening 43 is configured to receive an IV pole 45 for mounting this IV pole to said platform 40. This IV pole has a hook at its end for supporting a bag of infusion, for example.

[0092] This serum holder stem 45 can also be fitted with a nurse call button.

Claims

Demands

1. Armrest system (10) for a chair (100), said system 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) passing through the plate and 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.

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

3. 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. 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 a rear portion (48) coming into contact with said rear face of the mounting base.

5. 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 coming into contact with a first lateral edge (32a) of said rear face (32) of the mounting base (24) while the second wing comes into contact with a second lateral edge (32b) of the rear face of the mounting base, said first and second wings being spaced apart.

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

7. Armrest system according to any one of claims 2 to 6, wherein said mounting base (24) has a curved front face (30) extending along said longitudinal direction (L), and wherein the housing (44) of the tray (40) includes a portion of curved inner edge (47) cooperating with said front face of the mounting base.

8. Armrest system according to any one of claims 2 to 7, wherein said mounting base (24) comprises a rack portion (34) comprising an alternation of 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 the sliding of said movable rod relative to said mounting base.

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

10. Armrest system according to any one of claims 1 to 9, wherein said tray (44) is mounted sliding relative to said upright (20) of the armrest (12), along said longitudinal direction (L).

11. 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 rest, in order to limit the downward sliding of the tray relative to said upright (20) in said longitudinal direction (40).

12. Armrest system according to any one of claims 1 to 11, wherein said tray (40) is configured to be mounted to the upright (20) in a removable manner.

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

14. Armrest system according to any one of claims 1 to 13, further comprising a communication system having at least one element selected from an emergency call button, a microphone, a camera, and a loudspeaker.

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

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