ARMCHAIR WITH REMOVABLE BACKREST

Description

Domaine Technique

[0001] The present invention relates to the technical field of armchairs, and in particular to medical armchairs commonly used in hospitals. These medical armchairs are usually placed in patients' rooms, allowing them to sit up and thus avoid remaining lying in bed throughout their hospital stay. Technique antérieure

[0002] Traditional medical chairs consist of a base, a seat, and a backrest attached to the seat. One drawback of these chairs is that they do not meet hospital hygiene standards. In particular, they are generally made of materials that tend to trap and store dust and polluting particles. Furthermore, these chairs have numerous recesses and hard-to-reach areas where dust can accumulate and is difficult to clean. For example, it is particularly difficult to achieve satisfactory cleaning in the gap between the seat and the backrest.

[0003] Consequently, there is a significant risk of contamination of known chairs, thus endangering patient health. These chairs are therefore unhygienic and unsuitable for use in hospitals or any other environment where hygiene standards are particularly strict.

[0004] US 2021 / 393035 A1 describes a chair comprising a basic frame to which different backrests can be connected. Exposé de l'invention

[0005] One object of the present invention, which is set forth in the attached set of claims, is to provide an armchair that remedies the aforementioned disadvantages.

[0006] To this end, the invention relates to an armchair, for example a medical armchair, comprising a base intended to rest on a floor, a seat portion configured to cooperate with said base so as to form a seat for the armchair, and a back portion configured to be mounted to said base in order to form a backrest for the armchair, characterized in that said back portion is configured to be mounted to said base in a removable manner.

[0007] The chair according to the invention is particularly suitable for use in a hospital setting. The chair according to the invention is preferably a medical chair.

[0008] Preferably, the base is made primarily of metallic material.

[0009] The base preferably comprises at least two feet, preferably at least three feet, and even more preferably four feet.

[0010] Preferably, the base comprises a first foot, a second foot, a third foot and a fourth foot.

[0011] The base advantageously comprises a first section including the first and second legs, and a second section including the first and second legs. The first and second sections preferably extend on either side of a plane of vertical symmetry of the chair passing through a longitudinal direction of the base. Preferably, each leg of the base is in the form of an elongated plate. In other words, the legs are much thinner than their width, which is itself much thinner than their length. One advantage is that this reduces the surface area of ​​the legs on which dust can accumulate.

[0012] Preferably, the first leg section has an angled portion formed between the first and second feet. Preferably, the second leg section has an angled portion formed between the third and fourth feet.

[0013] Preferably, the second foot is inclined relative to the first foot at an angle between 60° and 120°, preferably at an angle between 80° and 100°, and even more preferably at an angle of approximately 90°.

[0014] The base advantageously comprises a crossbar extending between the first and second sections of the base. Preferably, said crossbar extends between the angled portion of the first section of the base and the angled portion of the second section of the base.

[0015] The first and second legs advantageously form a single unit. The third and fourth legs advantageously form a single unit.

[0016] The base comprises a frame including said legs. The seat portion is advantageously mounted to said frame.

[0017] The back portion extends advantageously almost vertically or slightly inclined from the vertical when mounted to the base. The seat portion extends transversely to the back portion. The seat portion extends almost horizontally when mounted to the base.

[0018] When mounted on the base, the dorsal portion forms a support on which the user can lean their back.

[0019] Preferably, but not limited to, the dorsal portion is essentially made of a plastic material. This dorsal portion may, but is not limited to, be made of any material suitable for medical use, preferably a dust-proof material or one that does not tend to retain dust. The dorsal portion advantageously includes a stiffening frame embedded within a dorsal body. Preferably, the dorsal body is made of a soft material to improve user comfort. This stiffening frame is advantageously U-shaped. The dorsal portion has the general shape of a rectangular parallelepiped with a rectangular longitudinal cross-section. In other words, this dorsal portion has a length greater than its width, preferably greater than 1.5 times its width.

[0020] The dorsal portion advantageously comprises a front face, a rear face, a lower edge, a upper edge, a first lateral edge and a second lateral edge.

[0021] Preferably, the dorsal portion is not connected to the seating portion.

[0022] Preferably, the seat portion is essentially made of a plastic material. Advantageously, the seat portion has the general shape of a rectangular parallelepiped with a square longitudinal section. In other words, the seat portion advantageously has a length substantially equal to its width, or slightly greater than its width.

[0023] According to the invention, the backrest portion is removably mounted to the base and can therefore be disassembled. Removable means that the backrest portion can be manually detached from the base by a user without using tools or exerting significant force. The backrest portion can be disassembled without tools. Therefore, the backrest portion is not fixed to the base in such a way that a user could not disassemble it without using a specific disassembly tool.

[0024] Therefore, the backrest can be easily detached from the base, allowing for thorough cleaning without difficulty. The invention eliminates the risk of dust accumulation in hard-to-reach areas of the backrest, particularly in the gap between the backrest and the seat. By disassembling the backrest, it is easy to clean its lower section and edge, which are inaccessible when the backrest is attached to the base.

[0025] The chair according to the invention is therefore particularly hygienic and suitable for use in a hospital setting or any other setting where hygiene standards are strict.

[0026] Another advantage is that it allows the chair to be taken up less space, for example when moving it to another room or for storage.

[0027] Without limitation, the backrest portion can be detached from the base simply by pulling on it. Alternatively, the backrest portion can be held attached to the base by means of a locking device, in which case the backrest portion can be detached after first operating the locking device.

[0028] The chair further includes a mounting device comprising at least one first mounting rod attached to the base or to the backrest portion, and at least one first mounting hole provided in the base when the first mounting rod is attached to the backrest portion, or provided in the backrest portion when the first mounting rod is attached to the base. The first mounting rod is configured to engage removably in the first mounting hole for mounting the backrest portion to the base. The mounting device enables the mounting of the backrest portion to the base. The mounting device also enables the backrest portion to be held transversely to the seat portion. The first mounting rod prevents the backrest portion from moving in a direction transverse to the first mounting rod.

[0029] Furthermore, the aforementioned first mounting rod allows the dorsal portion to be guided during its assembly to the base, as well as during its disassembly.

[0030] It is understood that when the first mounting rod is attached to the base, the said first mounting hole is provided in the dorsal portion.

[0031] The engagement of the first mounting rod in the first mounting hole allows the dorsal portion to be mounted to the base.

[0032] The first mounting rod is fixed to the base, with the first mounting hole being provided in the back section. In this non-limiting configuration, the first mounting rod extends inside the back section when the latter is mounted to the base. This first mounting rod then also acts as a stiffening element for the back section.

[0033] The base includes said first mounting rod, the latter extending substantially vertically or slightly inclined from the vertical when the chair rests on said floor, and said first mounting hole is provided in a lower edge of said backrest portion. Said rod effectively maintains the backrest portion substantially vertically or slightly inclined from the vertical.

[0034] In this configuration, the first mounting rod is fixed to the base. It extends inside the back section when the latter is mounted to the base. The first mounting rod then extends through the thickness of the back section, between a front and a rear face of the back section.

[0035] To detach the back section from the base, it is necessary to lift the back section and move it along the first mounting rod. One advantage is that the back section cannot be accidentally disconnected from the base.

[0036] Preferably, the mounting device further includes a second mounting hole provided in the lower edge of the backrest portion, at a distance from the first mounting hole, and the base includes a second mounting rod extending parallel to the first mounting rod, the second mounting rod being configured to engage removably in the second mounting hole for mounting the backrest portion to the base. The engagement of the first and second mounting rods in the first and second mounting holes, respectively, prevents the backrest portion from pivoting about the axis of the first mounting rod, about the axis of the second mounting rod, or about any other substantially vertical axis. The backrest portion is thus more securely mounted to the chair base.

[0037] It is understood that the distance between the first and second mounting holes is equal to the distance between the first and second mounting rods.

[0038] Preferably, the first mounting hole is provided in the lower edge of the dorsal portion near a first lateral edge of said dorsal portion. Preferably, the second mounting hole is provided in the lower edge of the dorsal portion near a second lateral edge of said dorsal portion, opposite the first lateral edge.

[0039] The distance between the first and second mounting holes is slightly less than the width of said dorsal portion.

[0040] The base comprises a frame and a mounting piece that pivots relative to the frame around a horizontal axis between at least one first and a second position. A first mounting rod is fixed to this mounting piece. One advantage of this is that it allows adjustment of the backrest's inclination relative to the vertical. By pivoting the mounting piece between the first and second positions around the horizontal axis, the inclination of the first mounting rod, and therefore of the backrest, relative to the vertical, is modified. This allows the user to adapt the backrest's inclination to their needs, thus improving the chair's ergonomics and the user's comfort.

[0041] The first and second positions of the mounting piece correspond to two distinct inclinations of the dorsal portion.

[0042] Preferably, the said mounting part can pivot between at least three positions.

[0043] Preferably, said horizontal axis is transverse to a longitudinal direction of the base.

[0044] Advantageously, the first mounting rod and the mounting piece form a single unit. The first mounting rod advantageously extends transversely relative to the mounting piece.

[0045] Preferably, the mounting piece extends parallel to said horizontal axis. The mounting piece advantageously comprises an elongated body, the first mounting rod extending transversely to said elongated body.

[0046] Preferably, the second mounting rod is also integral with the mounting piece. Preferably, said second mounting rod and the mounting piece form a single unit.

[0047] Preferably, the frame includes the chair legs.

[0048] Preferably, said chassis comprises a first lateral part and a second lateral part, said mounting piece being pivotally mounted relative to said first and second lateral parts around said horizontal axis, so that it extends transversely between said first and second lateral parts.

[0049] Preferably, the first and second lateral parts each extend in a substantially vertical plane or one slightly inclined with respect to the vertical. Preferably, the first and second lateral parts are in the form of plates. Advantageously, the first and second lateral parts extend parallel to each other. Preferably, the first and second lateral parts extend on either side of the mounting piece.

[0050] Preferably, the base extends along a longitudinal direction, the said first and second lateral parts extending substantially parallel to said longitudinal direction of the base.

[0051] Preferably, the chair also includes an actuating device located between the frame and the mounting piece, the actuating device being configured to rotate the mounting piece between the first and second positions. The actuating device allows force to be applied to the mounting piece, causing it to rotate. One advantage is that it facilitates moving the mounting piece from the first to the second position and vice versa, and thus facilitates adjusting the inclination of the backrest.

[0052] The actuation device preferably includes a cylinder disposed between the frame and the mounting part, configured to rotate the mounting part between the first and second positions. The actuation device advantageously includes a control element, for example a control lever, configured to actuate said cylinder.

[0053] Advantageously, the chair also includes a locking device that can assume a locked position, in which it is configured to hold the backrest section mounted to the base, and an unlocked position, in which it allows the backrest section to be removed. Until it is moved to the unlocked position, the locking device is configured to prevent the relative movement of the backrest section with respect to the base. The locking device prevents the backrest section from being mounted to the base. It prevents the backrest section from being accidentally removed from the base. User safety is therefore improved.

[0054] Preferably, the locking device includes a tightening knob configured to cooperate with the back portion and the base so as to hold the back portion mounted to the base when tightened. Preferably, the locking device is brought into the locked position when the tightening knob is brought into cooperation with the back portion and the base, and then tightened.

[0055] Preferably, the tightening knob cooperates with the mounting part of the base.

[0056] Preferably, a through-locking hole is provided in the base, or even more preferably in the mounting piece. The locking knob includes a threaded rod, while a screw thread is provided in the back portion. The threaded rod is configured to pass through the locking hole and to engage with the screw thread. The screw thread is advantageously provided in the lower edge of the back portion.

[0057] Alternatively, and without departing from the scope of the invention, the back portion may include a threaded rod configured to pass through said locking hole, said tightening knob having a thread and being configured to be screwed onto said threaded rod to place the locking device in the locked position. Preferably, the threaded rod extends from the lower edge of the back portion. Preferably, the threaded rod extends substantially parallel to the first mounting rod when the back portion is mounted to the base.

[0058] Preferably, said through-locking hole is provided in the mounting part of the base.

[0059] Advantageously, when said locking device is in the locked position, the tightening knob and the dorsal portion extend on either side of the mounting piece.

[0060] Advantageously, the locking device comprises at least one first magnetic portion attached to the base and at least one second magnetic portion attached to the back portion. The second magnetic portion is configured to cooperate with the first magnetic portion so as to hold the back portion mounted to the base. One advantage is that it allows for easy unlocking by applying force to the back portion. The magnetic force of the two magnetic portions is advantageously sufficient to prevent accidental disengagement of the back portion from the base. In the locked position, the first magnetic portion cooperates with the second magnetic portion through magnetization. The locking device is brought to the unlocked position by separating the two magnetic portions and thus moving the back portion relative to the base in a disassembly direction.

[0061] Without limitation, the first magnetized portion may be a portion of the mounting piece. Preferably, the mounting piece is made of metallic material.

[0062] Preferably, the locking device comprises a locking pin projecting from a lower edge of the back portion and configured to engage with an opening in the base. This locking pin is equipped with a friction element configured to maintain its engagement in the opening. One advantage is that this allows for effective locking of the back portion to the base while facilitating the unlocking of the locking device.

[0063] The friction force exerted by the friction element between the locking pin and the back section opposes the removal of said back section from the base and thus ensures locking. The locking device is brought to the unlocked position by applying a force to the back section in order to move it relative to the base in a direction of removal. The force applied to the back section must be greater than the friction force exerted by the friction element on said back section.

[0064] Preferably, said friction element includes an O-ring mounted around said locking pin.

[0065] Without departing from the scope of the invention, the locking device may include one or more of the locking solutions described above. For example, the locking device may jointly comprise a tightening knob configured to cooperate with a screw thread formed in the back, and two magnetic portions. One advantage is to further improve the locking mechanism.

[0066] One advantage of this feature is that the backrest comprises a main section and a headrest designed to be attached to the main section in a removable manner. The benefit of this headrest is that it allows the user to rest their head, thus improving comfort.

[0067] Removable means that the headrest can be manually detached from the main backrest section by a user, without tools or significant effort. This allows for easier and more effective cleaning of the headrest.

[0068] Preferably, said headrest is configured to be connected to said main part by means of a connection, for example connecting rods.

[0069] Preferably, said headrest includes a rear support portion on which the user can rest their head and at least one lateral support portion extending transversely to the rear support portion.

[0070] Advantageously, the seat portion is designed to be mounted to the base in a removable manner. Removable means that the seat portion can be manually detached from the base by a user without tools or significant effort. This allows for easier and more efficient cleaning of the seat portion.

[0071] It is therefore understood that, in this non-limiting variant, the backrest and seat sections can be detached from the base. Cleaning the base is thus also facilitated.

[0072] Advantageously, said base has a longitudinal direction, the base comprising at least a first transverse element and a second transverse element distant from the first transverse element, considered along said longitudinal direction, the first and second transverse elements extending transversely to said longitudinal direction, said portion of seat being configured to cooperate with said first and second transverse elements for mounting the portion of seat to the base.

[0073] The seating portion is configured to be removably mounted to the aforementioned first and second transverse elements.

[0074] Preferably, the first and second transverse elements extend perpendicularly to the longitudinal direction of the base. Preferably, the first and second transverse elements extend parallel to each other.

[0075] Preferably, the said first and second transverse elements extend between the first and second lateral parts of the chassis.

[0076] Preferably, at least one of the said first and second transverse elements connects the said first and second lateral parts of the chassis.

[0077] Preferably, the seating portion is provided with at least one connector configured to cooperate with said first transverse element and another connector configured to cooperate with said second transverse element.

[0078] Preferably, said connector has a housing configured to receive a transverse element.

[0079] Preferably, the seating portion includes at least three connectors, and even more preferably four connectors. Brève description des dessins

[0080] The invention will be better understood upon reading the following description of an embodiment of the invention given by way of non-limiting example, with reference to the accompanying drawings, in which: [ Fig. 1 ]there figure 1 is a perspective view of an embodiment of an armchair according to the invention; [ Fig. 2 ]there figure 2 illustrates the base of the armchair figure 1 ; Fig. 3 ]there figure 3 shows the armchair of the figure 1 , the dorsal portion having been disassembled; Fig. 4 ]there figure 4 shows the armchair of the figure 1 , the dorsal portion being shown transparent; Fig. 5 ]there figure 5 illustrates the dismantling of the backrest portion of the chair figure 1 ; Fig. 6 ]there figure 6 shows an initial variant of a locking device for the chair of the figure 1 ; Fig. 7 ]there figure 7 shows a second variant of a chair locking device figure 1 ; Fig. 8 ]there figure 8 shows a third variant of a chair locking device figure 1 ; Fig. 9 ]there figure 9 is a front view of the armchair of the figure 1 , the seating portion and the dorsal portion being shown transparent; Fig. 10 ]there figure 10 illustrates the dismantling of the seat portion of the armchair figure 1 ; And [ Fig. 11 ]there figure 11 illustrates a variant of the backrest portion of the chair figure 1 . Description des modes de réalisation

[0081] The invention relates to an armchair, in particular a medical armchair, comprising a removable backrest portion.

[0082] There figure 1 is a perspective view of one embodiment of an armchair according to the invention. The armchair 10 This is a medical chair particularly suited for use in a hospital setting.

[0083] According to the invention, the armchair comprises a base 20, a portion of the seat 50 and a dorsal portion 60 which will be described in more detail later. The dorsal portion 60 is mounted removablely to the base 20. In this non-limiting example, the portion of the seat 50 is also mounted removablely to the base 20. The armchair 10 It also includes two armrests 12 attached to the base.

[0084] There figure 2 shows the base 20 of the armchair 10, the dorsal portion 60 and the seating portion 50 having been dismantled. For better visibility, the seat portion 50,the dorsal portion 60 and the two armrests 12 are not shown in this figure. In this figure 2 , we observe that the base 20 extends along a longitudinal direction L. The base 20 includes a chassis 25 and a mounting part 40. The chassis 25 includes the first 21, second 22, third 23 and fourth 24 The feet are configured to rest on the ground. 21,22,23,24 each have the shape of an elongated plate.

[0085] The chassis 25 includes a first section of the base 28 including the first and second feet 21,22. The first and second legs form a single piece. The first section of the base 28 includes an angled portion 29 connecting the first and second feet 21,22. Also, the second foot 22is inclined relative to the first foot 21, at an angle of approximately 90°. The chassis 25 also includes a second section of the base 30 including the third and fourth feet 23,24. The third and fourth legs form a single piece. The second section of the base 30 includes an angled portion 31 connecting the third and fourth feet 23,24. Also, the fourth foot 24 is inclined relative to the third foot 23, at an angle of approximately 90°. The first and second sections of the base 28,30 extend on either side of a vertical plane of longitudinal symmetry of the base 20, passing through the longitudinal direction L.

[0086] The chassis 25 also includes a crossbar 32 extending transversely between the first section of the base 28and the second section of the base 30. This crossbar 32 extends horizontally and substantially perpendicularly to the longitudinal direction L of the base 20.

[0087] The chassis 25 also includes a first lateral part 33 and a second lateral part 34. The first and second lateral sections 33,34 They essentially have a plate-like shape and extend substantially parallel to each other, and parallel to the longitudinal direction. L of the base 20. The first side part 33 is positioned above the first section of the base 28. The second side part 34 is positioned above the second section of the base 30.

[0088] The first and second lateral sections 33,34 each have a front end 33a,34a and a rear end 33b,34b. The front extremities 33a,34a of the first and second lateral sections 33,34 are connected to each other by a first transverse element 35 extending perpendicularly to the longitudinal direction L. The first cross-cutting element 35 has the shape of a stem.

[0089] The chassis also includes a second transverse element. 36 and a third cross-cutting element 37 also featuring the shape of rods. The second transverse element 36 protrudes transversely from the first lateral part 33, between the first and second lateral sections 33,34. The third cross-cutting element 37 protrudes transversely from the second lateral part 34, between the first and second lateral sections 33,34. The second and third cross-cutting elements 36,37extend horizontally and perpendicularly to the longitudinal direction L of the base 20. The first and second cross-cutting elements 36,37 extend in line with each other.

[0090] The second cross-cutting element 36 presents a length approximately equal to the length of the third transverse element 37. The second and third cross-cutting elements 36,37 have a length shorter than the length of the first transverse element 35, preferably less than one-third the length of the first transverse element. The first and second transverse elements 36,37 Each therefore has a free distal end located between the first and second lateral parts. 33,34 of the chassis 25.

[0091] The mounting part 40 will now be described in more detail, with reference to the figure 3 ,on which the dorsal portion 60 and one of the armrests 12 are not shown, for the sake of clarity. On this figure 3 , we observe that the mounting part 40 is mounted pivotally relative to the chassis 25 around an axis X horizontal. The axis X extends perpendicularly to the longitudinal direction L of the base 20. More specifically, the mounting part 40 is mounted pivotally relative to the rear ends 33b,34b of the first and second lateral sections 33,34 around said axis X. It therefore extends between the aforementioned rear extremities 33b,34b of the first and second lateral sections 33,34. The axis X traverses the said first and second lateral parts 33,34

[0092] The mounting part includes an elongated body 41 extending parallel to said axis X.

[0093] The armchair 10 also includes a first mounting rod 42 and a second mounting rod 44. In this non-limiting example, the first and second mounting rods 42,44 are integral to the mounting part 40. They are spaced apart. The first and second mounting rods 42,44 and the mounting part 40 form a single piece. The first and second mounting rods 42,44 protrude from the reclining body 41 of the mounting part, perpendicular to said elongated body 41. The first and second mounting rods extend substantially vertically, or slightly inclined from the vertical.

[0094] The mounting part 40 is configured to pivot relative to the chassis 25, around the axis X,between at least one first position and one second position, each corresponding to an inclination of said first and second mounting rods 42,44.

[0095] The mounting part 40 also includes an actuation portion 46 protruding transversely from the elongated body 41. The armchair 10 It also includes an actuation device 48 including, in this non-limiting example, a cylinder 49 arranged between the chassis 25 and said mounting part 40. More specifically, the jack 49 extends between the actuation portion 46 of the mounting part and the first transverse element 35 of the chassis 25. This jack 49 is configured to rotate the mounting part at least between the first position and the second position when actuated.

[0096] The actuation device 48also includes a control unit 47 consisting here of a control lever 47, configured to actuate said cylinder 49 and illustrated in figure 5 . This control lever 47 It extends advantageously partly under the seat and partly to the side of the seat. It is then easily accessible to the user seated on the seat. 50.

[0097] We will now describe the dorsal portion 60 in reference to figures 4 And 5 . On the figure 4 , the dorsal portion 60 is shown transparent in order to illustrate its attachment to the base 20. The dorsal portion 60 It has the general shape of a rectangular parallelepiped with a rectangular longitudinal section. The dorsal portion 60 includes a stiffening frame 62 embedded within a dorsal fin64 made of plastic. Said stiffening reinforcement 62 presents the shape of an inverted "U".

[0098] The dorsal portion 60 advantageously includes a front face 65, a back 66, a lower edge 67, an upper edge 68, a first lateral edge 69 and a second lateral edge 70.

[0099] In this non-limiting example, a first mounting hole 72 and a second mounting hole 74, particularly visible in figure 5 , are provided in the lower edge 67 of the dorsal portion 60. These first and second mounting holes 72,74 are separated by a distance approximately equal to the distance separating the first mounting rod 42 and the second mounting rod 44. These first and second mounting holes 72,74are formed between the front faces 65 and back 66 of the dorsal portion 60 and extend parallel to these faces. In this non-limiting example, the stiffening reinforcement 62 is hollow and extends from the lower edge 67 of the dorsal portion 60. The said first and second mounting holes 72,74 extend inside said stiffening framework 62.

[0100] As illustrated in figure 4 , to mount the dorsal portion 60, removable, at the base 20, the first and second mounting rods 42,44 are engaged respectively inside the first and second mounting holes 72,74, so that they extend parallel to the front and rear faces 65,66 of the dorsal portion. They also engage within the stiffening framework 62.When said dorsal portion 60 is mounted on the base 20 it forms a backrest for the said armchair 10.

[0101] The first and second mounting rods 42,44 and the first and second mounting holes 72,74 form a mounting device 76 for the armchair 10. This cooperation between the mounting rods 42,44 and the mounting holes 72,74 allows for the maintenance of the dorsal portion 60 mounted at the base, transversely to the seat portion 50. The user can therefore rest their back on this dorsal portion. 60 without it tipping over. When it is mounted on the base 20, and as we can see in figure 4 , the dorsal portion 60 extends substantially vertically or slightly inclined with respect to the vertical.

[0102] When it is mounted on the base, the dorsal portion 60 then cooperates with the assembly part 40 and is rotationally linked with said mounting piece around the axis X. Also, by rotating the mounting part 40 in relation to the chassis 25, around the axis X, by means of the actuation device 48, It is possible to adjust the inclination of the dorsal portion. 60, thus improving user comfort.

[0103] The armchair 10 also includes a locking device 80,80',80" being able to assume a locked position in which it is configured to hold the dorsal portion 60 mounted at the base 20, as well as an unlocked position in which it allows the dorsal portion to be disassembled 60.

[0104] Three variations of the locking mechanism 80,80',80" are illustrated in figure 6 , 7 et 8 .

[0105] There figure 6 shows an initial variant of the locking device 80 of the armchair 10. In this variant, the locking device 80 includes a tightening knob 82 including a threaded rod 83. The locking device also includes a screw thread 84 formed in the lower edge 67 of the dorsal portion 60. In addition, the mounting part 40 of the base 20 features a locking hole 43 traversing carefully within his prone body 41. The threaded rod 83 of the tightening button 82 is configured to extend through said locking orifice 43 and to engage with the screw thread 84 to place the locking device 80in the locked position. Switching from the locked to the unlocked position is done by tightening or loosening the tightening knob. 82.

[0106] There figure 7 shows a second variant of the locking device 80' of the armchair 10. In this variant, the mounting part 40 is made of metallic material and forms a first magnetic portion 87. In addition, the locking device 80' includes a first magnet 86 forming a second magnetic portion 86 and a second magnet 88 forming a third magnetic portion 88. The two magnets 86,88, Therefore, the second and third magnetic portions are configured to cooperate magnetically with the mounting part. 40 to place the locking device 80' in the locked position. To position the locking device 80'In the unlocked position, pull on the dorsal portion. 60 in order to separate the two magnets 86,88 of the mounting part 40.

[0107] There figure 8 shows a third variant of the locking device 80" of the armchair 10. In this variant, the locking device 80" includes a blocking pawn 90 protruding from the lower edge 67 of the dorsal portion. The locking pin 90 includes a friction element 92, consisting, in this non-limiting example, of an O-ring arranged around the locking pin 90. Furthermore, an opening 45 is provided in the assembly room 40 of the base 20. To install the locking device 80" in the locked position, the locking pin 90 is engaged in the said opening 45. The friction element92 then exerts a frictional force on the mounting part 40 now the blocking pawn 90 committed to openness 45. To install the locking device 80" In the unlocked position, pull on the dorsal portion. 60 in order to disengage the blocking pawn 90 of the opening 45.

[0108] According to the invention, the dorsal portion 60 is mounted to the base in a removable manner. In other words, the user can manually detach the back section. 60 relative to the base 20 without using any tools. One advantage is the ability to easily clean the dorsal portion. 60. To disassemble the back section, among other things, the user first removes the locking device. 80,80',80" in the unlocked position. He then moves the dorsal portion 60in order to disengage the first and second mounting rods 42,44 compared to the first and second mounting holes 72,74.

[0109] Assembling the seat section 50 at the base 20 will now be described with reference to figures 5 , 9 And 10 . As can be seen in figure 5 , the seating portion 50 It has the shape of a rectangular parallelepiped, with a roughly square longitudinal section. The base portion 50 is formed, without limitation, in a plastic material.

[0110] The seating portion 50 includes an upper face 55, on which the user can sit, and an underside 56 positioned downwards and opposite the chassis 25. The seating portion 50 is equipped with first 51, second 52, third 53and fourth 54 connectors protruding from the underside 56. These connectors 51,52,53,54 Each defines a semicircular housing. The first and second connectors 51,52 are located near a front edge of the seat portion, while the third and fourth connectors 53,54 are located near a rear edge of the seating portion.

[0111] As illustrated in figure 9 , to assemble the seat portion 50 at the base 20, and more specifically to the chassis 25, The first and second connectors are removable. 51,52 are configured to cooperate with the first transverse element 35. The third and fourth connectors 53,54 are configured to cooperate respectively with the second and third transverse elements 36,37. When the seat portion 50is mounted at the base, the first transverse element 35 is engaged in the housings of the first and second connectors 51,52. Furthermore, the second cross-cutting element 36 is engaged in the housing of the third connector 53 and the third cross-sectional element 37 is engaged in the housing of the fourth connector 54.

[0112] The seat portion is mounted to the base in a removable manner. 20, and the chassis 25. That is to say, it can be detached from the base. 20 manually and without tools. To disassemble the seat section 50, It is necessary to pull upwards on it in order to disengage the first, second and third transverse elements. 35,36,37 connector housings 51,52,53,54, as illustrated in figure 10 . The seating area can then be cleaned easily and efficiently.

[0113] There figure 11illustrates a variant of the dorsal portion 60 of the armchair 10 in which the latter includes a main portion 61 and a headrest 63 configured to be mounted to the main part in a removable manner. For this purpose, connection holes 65 are formed in the headrest 63, while connecting rods 71 protrude from the main portion 61 of the dorsal portion. The connecting rods 71 are configured to engage in the connection ports 65 for mounting the headrest 63 to the main portion 61 in a removable manner.

Claims

1. A chair (10), for example a medical chair, comprising: - a base (20) intended to rest on a floor and comprising a frame (25), - a seat portion (50) configured to cooperate with said base so as to form a seat for the chair - a back portion (60) configured to be mounted in a removable manner on said base in order to form a backrest for the chair; and - a mounting device (76) comprising: at least a first mounting orifice (72) provided in a lower edge (67) of the back portion; and at least a first mounting rod (42) secured to the base (20), said base comprising said first mounting rod, the latter extending substantially vertically or slightly inclined relative to the vertical when the chair (10) rests on said floor, said first mounting rod being configured to engage in a removable manner in said first mounting orifice for mounting the back portion on the base, characterized in that the base comprises a mounting piece (40) pivotally mounted relative to the frame of the base about a horizontal axis (X) between at least a first position and a second position, said at least one first mounting rod (42) being secured to said mounting piece.

2. The chair according to claim 1, wherein the mounting device (76) further comprises a second mounting orifice (74) provided in said lower edge (67) of the back portion (60), at a distance from the first mounting orifice (72), and wherein the base (20) comprises a second mounting rod (44) extending parallel to the first mounting rod (42), the second mounting rod being configured to engage in a removable manner in said second mounting orifice for mounting the back portion on the base.

3. The chair according to claim 1 or 2, wherein said frame (25) comprises a first lateral part (33) and a second lateral part (34), said mounting piece (40) being pivotally mounted relative to said first and second lateral parts about said horizontal axis (X), so that it extends transversely between said first and second lateral parts.

4. The chair according to any one of claims 1 to 3, further comprising an actuation device (48) arranged between the frame (25) and said mounting piece (40), the actuation device being configured to pivot the mounting piece between the first position and the second position.

5. The chair according to any one of claims 1 to 4, further comprising a locking device (80) able to take a locking position wherein it is configured to maintain said back portion (60) mounted to the base (20), as well as an unlocked position wherein it allows the dismantling of the back portion.

6. The chair according to claim 5, wherein the locking device (80) comprises a clamping knob (82) configured to cooperate with said back portion (60) and the base (20) so as to maintain said back portion mounted to the base when it is tightened.

7. The chair according to claim 5 or 6, wherein the locking device (80) comprises at least a first magnetic portion (87) secured to the base (20) and at least one second magnetic portion (86,88) secured to the back portion (60), the second magnetic portion being configured to cooperate with the first magnetic portion so as to maintain said back portion mounted to the base.

8. The chair according to any one of claims 5 to 7, wherein the locking device (80) comprises a blocking pin (90) projecting from a lower edge (67) of the back portion (60) and configured to engage with an opening (45) provided in the base (20), said blocking pin being provided with a friction element (92) configured to maintain said blocking pin engaged in said opening.

9. The chair according to any one of claims 1 to 8, wherein said seat portion (50) is configured to be mounted on said base (20) in a removeable manner.

10. The chair according to claim 9, wherein said base (20) presents a longitudinal direction (L), the base comprising at least a first transverse element (35) and a second transverse element (36) distant from the first transverse element, considered according to said longitudinal direction, the first and second transverse elements extending transversely to said longitudinal direction, said seat portion (50) being configured to cooperate with said first and second transverse elements for mounting the seat portion to the base.