Chair for treating a patient

Abstract

The invention relates to a chair (100) for treating a patient. The chair (100) has a seat element (110) with a first bearing element (111) rigidly attached to the seat element (110). The chair (100) also has a back element (120) with a second bearing element (121) rigidly attached to the back element (120). The chair (100) further has a connecting joint (130) that connects the seat element (110) and the back element (120). Finally, the chair (100) has an adjusting device (140) that engages the first bearing element (111) and the second bearing element (121) to move the first bearing element (111) relative to the second bearing element (121). Additionally, the positioning device (140) is arranged in a housing of the chair (100) which serves as a base, and the seat element (110) and the back element (120) can be moved independently of each other and freely positioned by means of the positioning device (140).

Description

Technical field

[0001] The invention relates to a chair for treating a patient. State of the art

[0002] In a treatment chair, such as a dental chair, the backrest and seat are often axially adjustable to allow for different patient positions. For example, the patient might be seated during the first treatment step and lying down during the second. To change the patient's position axially, the backrest and seat are adjusted by rotating them on pivot points. The positions of these pivot points on the chair are often determined based on average body dimensions and are therefore fixed.

[0003] However, if the patient's height or body proportions deviate significantly from average dimensions, the chair's axes of rotation will not align with the patient's joints, such as the hip joint, and any change in position may be perceived as uncomfortable. To make repositioning more comfortable for the patient, costly aids such as special children's chairs or cushions are often used. These aids also frequently require extensive disinfection after use.

[0004] German patent application DE 27 52 528 A1 describes a dental patient chair with a seat and a backrest, which together form the chair upper. The chair upper is supported by a frame to which the free end of a parallelogram linkage, articulated to a base, is attached. The height of the chair upper can be adjusted by means of an adjustment device acting on the parallelogram linkage.

[0005] German patent application DE 20 2011 109 649 U1 describes a treatment chair. The treatment chair comprises a seat, a backrest, a base, and an adjustment system. The adjustment system has a first guide track and at least a second guide track, which are connected by a guide pin. The first and second guide tracks are arranged relative to each other such that when the adjustment system is moved between a first end position and a second end position of the guide pin, the seat is moved relative to the backrest. Another treatment chair is known from WO 02053080 A1. Description of the invention

[0006] The object of the invention is to create a chair belonging to the aforementioned technical field which overcomes the disadvantages of the prior art as far as possible. In particular, an ergonomic concept for changing the positioning of a patient during treatment is to be created.

[0007] The solution to the problem is defined by the features of claim 1. The invention comprises a chair for treating a patient. The chair has a seat element with a first bearing element rigidly attached to the seat element. The chair also has a back element with a second bearing element rigidly attached to the back element. Furthermore, the chair has a connecting joint that links the seat element and the back element. The chair also has an adjusting device that engages the first bearing element and the second bearing element to move the first bearing element relative to the second bearing element. By connecting the seat element and the back element via the connecting joint and the respective rigidly attached bearing elements, the seat element and the back element can be moved and freely positioned independently of each other by means of the adjusting device.This allows axial and vertical movements of the seat and backrest elements to be adjusted to the patient's height and body proportions when their position changes. This can make changing the patient's position more comfortable.

[0008] According to one aspect of the invention, the adjusting device is arranged in a housing of the chair that serves as a base. The seat element and the back element can be moved and positioned independently of each other by means of the adjusting device. However, they can also be moved or positioned together.

[0009] A chair for treating a patient within the meaning of this invention is understood to be a device that can be used to treat a patient sitting on it. For example, the chair is a treatment chair, an examination chair, a therapy chair, a reclining chair, a nursing chair, a cosmetic couch, or a patient couch. The chair can also be used for dental treatment, podiatric treatment, urological treatment, proctological treatment, gynecological treatment, and / or cosmetic treatment of the patient. For example, the chair is a dental chair and / or the patient is a human patient.

[0010] A particular embodiment of the invention consists in the adjusting device engaging the first bearing element (111) from within the housing by means of a first transmission device (141) and the second bearing element (121) by means of a second transmission device (142). This effectively holds the seat elements out of the housing by two arms. The space directly beneath the chair can therefore be kept free of bulky substructures.

[0011] The seat element can be a frame element of the chair. A seat cushion can also be attached to the seat element, forming a seating surface for the patient. Furthermore, the back element can be another frame element of the chair. A back cushion can also be attached to the back element, forming a backrest for the patient. The respective bearing elements can be articulated bearings, plain bearings, and / or roller bearings. The first bearing element can be connected to the seat element and / or the second bearing element to the back element by a force-fit or material-fit connection to ensure a rigid attachment. For example, the first bearing element can be bolted or welded to the seat element and / or the second bearing element to the back element. Alternatively or additionally, the first bearing element and the seat element and / or the second bearing element and the back element can be integrally formed or manufactured as a single piece.The connecting joint can be a double joint, a pivot joint, a ball joint, and / or a passive joint. A passive joint can be a joint without a motor drive. Furthermore, the actuating device can include at least one drive, such as an electric motor, for moving the first bearing element and / or the second bearing element.

[0012] To achieve leverage on the seat element when the first bearing element moves, the first bearing element can be positioned at a distance from the seat element. For example, the distance between the first bearing element and the seat element can be more than 5%, more than 10%, more than 20%, or more than 30% of the seat element's length. Furthermore, the first bearing element can be rigidly attached to the seat element using a fork-shaped fastener, allowing for rigid attachment at multiple points, particularly on different sides of the seat element. This can also increase the chair's resistance to tipping sideways. The distance between a mounting point of the first bearing element on the seat element and the connecting joint can be less than 50%, less than 40%, less than 30%, or less than 10% of the seat element's length.Due to the proximity of the attachment point to the connecting joint, the adjusting device can be positioned close to the joint. This reduces the chair's dimensions, particularly in the area near the floor. As a result, the freedom of movement for the person treating the patient, such as a doctor or assistant, can be increased.

[0013] To achieve leverage on the backrest when the second bearing element moves, the second bearing element can be positioned at a distance from the backrest. For example, the distance between the second bearing element and the backrest is more than 5%, more than 10%, more than 20%, or more than 30% of the backrest's length. Furthermore, the second bearing element can be rigidly attached to the backrest using a fork-shaped fastener, allowing for rigid attachment at multiple points, particularly on different sides of the backrest. This can also increase the chair's stability against tipping sideways. The distance between an attachment point of the second bearing element on the backrest and the connecting joint can be less than 50%, less than 40%, less than 30%, or less than 10% of the backrest's length.Due to the proximity of the attachment point to the connecting joint, the adjusting device can be positioned close to the joint. This reduces the chair's dimensions, particularly in the area near the floor. As a result, the freedom of movement for the person treating the patient, such as a doctor and / or assistant, can be increased.

[0014] To better adapt the movement trajectory of the seat element to the patient's body dimensions and / or proportions when their position changes, the adjusting device can include a first adjusting mechanism that engages the first bearing element for horizontal and / or vertical adjustment of the seat element. This offers the additional advantage of making repositioning more comfortable for the patient. To move the seat element more efficiently, the first adjusting mechanism can include a first drive and a first transmission device connected to the first bearing element. For example, the first transmission device includes a piston or a transmission rod. The first drive can include a motor, particularly an electric motor, and / or a gearbox.To reduce the dimensions of the first positioning device and thus increase the freedom of movement for the person treating the patient, the first positioning device can include a first spindle. The first spindle can be a threaded spindle. Furthermore, the first spindle can be connected to the first transmission device to move it. To further optimize the movement trajectory of the seat element, the longitudinal axis of the first spindle can extend orthogonally to a bearing axis of the first bearing element. According to a particular embodiment, the first bearing element can be designed as a spherical bearing. In addition, the bearing axis of the first bearing element can be a pivot axis of the spherical bearing.

[0015] To better adapt the movement trajectory of the back element to the patient's body dimensions and / or proportions when their position changes, the adjusting device can include a second adjusting mechanism that engages the second bearing element for horizontal and / or vertical adjustment of the back element. This offers the additional advantage of making repositioning more comfortable for the patient. To move the back element more efficiently, the second adjusting mechanism can include a second drive and a second transmission device connected to the second bearing element. For example, the second transmission device includes a piston or a transmission rod. The second drive can include a motor, particularly an electric motor, and / or a gearbox.To reduce the dimensions of the second positioning device and thus increase the freedom of movement for the person treating the patient, the second positioning device can include a second spindle. The second spindle can be a threaded spindle. Furthermore, the second spindle can be connected to the second transmission device to move it. To further optimize the movement trajectory of the back element, the longitudinal axis of the second spindle can extend orthogonally to a bearing axis of the second bearing element. According to a particular embodiment, the second bearing element can be designed as a spherical bearing. In addition, the bearing axis of the second bearing element can be a pivot axis of the spherical bearing.

[0016] To allow the seat and backrest elements to move more independently, the connecting joint can be designed as a double joint. The connecting joint can include an angled spacer to optimize the movement of the seat element when the backrest element is adjusted, and / or vice versa. For example, the spacer is angled at more than 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 90°. This can be advantageous, for instance, when the upholstery of the seat and backrest elements is particularly thick. In this case, the angled spacer increases the movement of the seat element relative to the backrest element.Designing the connecting joint as a double joint offers the additional advantage that movement of the first bearing element relative to the second, or vice versa, can occur largely independently of each other via the double joint. This allows axial and vertical movements of the seat and backrest elements to be easily adjusted to the patient's height and body proportions when their position changes. In other words, the distance between the seat and backrest can be varied as needed, enabling simple adaptation to the specific ergonomic characteristics of a patient.

[0017] To facilitate operation of the chair, it may also feature a control console for controlling a function of the adjustment mechanism. The control console may include at least one actuation element, such as a touchscreen, rotary knob, slider, button, directional pad, and / or analog stick, for controlling the movement of the first bearing element and / or the second bearing element. For example, the control console may be integrated into an armrest of the chair or into a housing of the adjustment mechanism. Alternatively or additionally, the chair may have a communication interface for communicating with a control console. The communication interface may be wireless or wired.

[0018] To make sitting or lying on the chair more comfortable for the patient, the chair can have at least one armrest that is rigidly molded to the backrest. For example, the patient rests an arm on the armrest while seated, and / or reaches under the armrest with one hand while lying down. The armrest and backrest can form an integral component to increase the chair's stability. In this case, the backrest and armrest can merge seamlessly, creating a continuous surface. Alternatively or additionally, the armrest can be attached to the backrest by frictional and / or form-fitting means. For example, the armrest can be screwed or welded to the backrest. Furthermore, the armrest can be wing-shaped and / or narrow.

[0019] In special embodiments: The first bearing element (111) is arranged at a distance from the seat element (110); and / or the first bearing element (111) is rigidly attached to the seat element (110) by means of a fork-shaped fastening element (112); and / or the distance between a fastening point (113) of the first bearing element (111) on the seat element (110) and the connecting joint (130) is less than 50% of the length of the seat element (110); and / or the second bearing element (121) is arranged at a distance from the back element (120); and / or the second bearing element (121) is rigidly attached to the back element (120) by means of a fork-shaped fastening element (122); and / or the distance between a mounting point (123) of the second bearing element (121) on the back element (120) and the connecting joint (130) is less than 50% of the length of the back element (120); and / or the chair (100) further comprises a control console for controlling a function of the positioning device (140);and / or the chair (100) has at least one armrest (124) which is rigidly molded onto the back element (120); and / or the at least one armrest (124) and the back element (120) form an integral component.

[0020] Further advantageous embodiments and combinations of features of the invention can be derived from the following detailed description and the entirety of the patent claims. Brief description of the drawings

[0021] The drawings used to illustrate the exemplary embodiment show: Fig. 1A a schematic representation of a chair for treating a patient according to a first embodiment; Fig. 1Legs a schematic representation of a chair with a double joint between the seat and backrest according to a second embodiment; Fig. 1C an additional schematic representation of the chair according to the embodiment from Figure 1B, wherein the chair is in an alternative ergonomic arrangement; Fig. 2 a chair for treating the patient according to a third embodiment in a side view; Fig. 3 the chair for treating the patient according to the third embodiment in a further perspective; Fig. 4 the chair for treating the patient according to a fourth embodiment; Fig. 5 the chair for treating the patient according to a further embodiment; and Figs. 6a-6h the chair for treating the patient according to yet another embodiment in different positions.

[0022] Basically, identical parts in the figures are marked with the same reference symbols. Ways to implement the invention

[0023] The Figure 1AFigure 1 shows a chair 100 for treating a patient according to a first embodiment. The chair 100 has a seat element 110 with a first bearing element 111 rigidly attached to the seat element 110. The chair 100 also has a back element 120 with a second bearing element 121 rigidly attached to the back element 120. The chair 100 further has a connecting joint 130 that connects the seat element 110 and the back element 120. Finally, the chair 100 has an adjusting device 140 that engages the first bearing element 111 and the second bearing element 121 to move the first bearing element 111 relative to the second bearing element 121. By connecting the seat element 110 and the back element 120 via the connecting joint 130 and the respective rigidly attached bearing elements 111, 121, the seat element 110 and the back element 120 can be moved independently of each other and freely positioned by means of the adjusting device 140.This allows axial and vertical movements of the seat element 110 and the back element 120 to be adjusted to the patient's height and body proportions when the patient's position changes. This can make changing the patient's position more comfortable.

[0024] In the present embodiment, the adjusting device 140 engages the first bearing element 111 by means of a first transmission device 141 and the second bearing element 121 by means of a second transmission device 142. For example, the respective transmission devices 141 and 142 are formed by plungers or transmission rods. Furthermore, the first bearing element 111 is spaced apart from the seat element 110, and the second bearing element 121 is spaced apart from the back element 120. For this purpose, the first bearing element 111 is rigidly attached to the seat element 110 at a mounting point 113 by means of a fastening element 112, and the second bearing element is rigidly attached to the back element 120 at a mounting point 123 by means of a fastening element 122. For example, the fastening elements 112 and 122 each have a rod or fork shape.The distance between the attachment point 113 and the connecting joint 130 is less than 30% of the length of the seat element 110. Furthermore, the distance between the attachment point 123 and the connecting joint 130 is less than 30% of the length of the back element 120.

[0025] The Figure 1B Figure 100 shows a chair 100 for treating a patient according to a second embodiment. In contrast to the first embodiment shown in the Figure 1AThe connecting joint 130 comprises a first joint element 132 and a second joint element 133. The connecting joint 130 is thus designed as a double joint, resulting in more degrees of freedom for the connecting joint 130. This allows the movement of the first bearing element 111 relative to the second bearing element 121, or vice versa, to occur largely independently of each other via the double joint. This offers the advantage, for example, that axial and vertical movements of the seat element and the back element can be performed independently of each other. Additionally, it provides greater flexibility with regard to the ergonomic adaptability of the chair 100 to a patient. As an alternative to the double joint, a band or chain-like connection could also be used. This would further increase the flexibility with regard to the adaptability of the chair 100.

[0026] A further difference from the previous embodiment lies in the fact that both the first bearing element 111 and the second bearing element 121 each comprise two spaced-apart bearing element axes. "Spaced-apart" here refers to a distance that is perpendicular to the longitudinal direction of the bearing element axes. The first bearing element 111 comprises a first bearing element axis 111-1 and a second bearing element axis 111-2. The second bearing element 121 comprises a first bearing element axis 121-1 and a second bearing element axis 121-2. The spaced-apart bearing element axes 111-1, 111-2; 121-1, 121-2 are each located in pairs on one of the fastening elements 122, which are rigidly connected to the seat element 110 and the back element 120. The first bearing element axis 111-1 and the second bearing element axis 111-2 of the first bearing element 111 run parallel to each other.Preferably, both the first bearing element axis 111-1 and the second bearing element axis 111-2 are aligned orthogonally to the fastening element 112. Likewise, the first bearing element axis 121-1 and the second bearing element axis 121-2 of the second bearing element 121 run parallel to each other and are preferably aligned orthogonally to the fastening element 122.

[0027] The Figure 1C Figure 1 shows a schematic representation of chair 100 in the embodiment according to the second embodiment, wherein chair 100 has an alternative ergonomic arrangement. The seat element 110 of chair 100 has a shortened seat length due to the appropriate positioning of the back element 120 and the connecting element 130, and is therefore suitable for a patient of short stature. This contrasts with the Figure 1B, in which the seat length is significantly longer, thus better meeting the ergonomic requirements for a patient with a greater body length.

[0028] The Figure 2 Figure 1 shows chair 100 for treating the patient according to a third embodiment in a side view. Chair 100 can be used like the one described in connection with the Figure 1B The chair described above is designed as follows. In the present embodiment, the chair 100 additionally has a headrest 150. Furthermore, the seat element 110 and the back element 120 each have ergonomic, rounded shapes to make sitting and / or lying on the chair 100 more comfortable for the patient. The connecting joint 130 is also designed as a double joint 130 with an angled spacer 131, wherein the connecting joint 130 comprises the first joint element 132 and the second joint element 133.

[0029] The chair 100 has two first bearing elements 111, which are rigidly attached to the seat element 110 at two attachment points 113 via the fork-shaped fastening element 112. Two first transmission devices 141 of a first actuating device 147 of the actuating device 140 engage with the first bearing elements 111. The first actuating device 147 further comprises a first drive 143, such as an electric motor, and a first spindle 144, such as a threaded spindle. The first spindle 144 is connected to the first bearing element 111-1 via the first transmission device 141-1. The first actuating device 147 also comprises a further first drive (not shown) and a further first spindle (not shown), which is connected to the first bearing element 111-2 via the first transmission device 141-2. For example, the first bearing elements 111 are formed by spherical bearings and the first transmission devices 141 by pistons.The connecting joint 130 is designed as a double joint 130 with an angled spacer 131, the first joint element 132 and the second joint element 133.

[0030] Furthermore, the chair 100 has two second bearing elements 121, which are rigidly attached to the back element 120 at two attachment points 123 via the fork-shaped fastening element 122. Two second transmission devices 142 of a second adjusting device 148 of the adjusting device 140 engage with the second bearing elements 121. The second adjusting device 148 further comprises a second drive 145, such as an electric motor, and a second spindle 146, such as a threaded spindle. The second spindle 146 is connected to the second bearing element 121-1 via the second transmission device 142-1. In addition, the second adjusting device 148 further comprises a second drive (not shown) and a second spindle (not shown), which is connected to the second bearing element 121-2 via the second transmission device 142-2.For example, the second bearing elements 121 are formed by spherical bearings and the second transmission devices 142 by punches.

[0031] The distance between the first bearing elements 111 and the seat element 110 is more than 10% of the length of the seat element 110. Furthermore, the distance between the second bearing elements 121 and the back element 120 is more than 10% of the length of the back element 120.

[0032] The Figure 3Figure 1 shows the chair 100 for treating the patient according to a third embodiment from a further perspective. In this perspective, it can be seen that the seat element 110, the back element 120, and the headrest 150 form frame elements of the chair 100. For example, the frame elements are made of metal to increase the mechanical stability of the chair 100. The frame elements each have openings into which a cushion element can be received. Furthermore, a narrow, wing-shaped armrest 124 is integrally formed on the back element 120. The attachment point 123-1 of the fastening element 122 is located in the area of ​​the armrest 124. The attachment point 123-2 of the fastening element 122 is also located between the armrest 124 and the headrest 150.

[0033] Furthermore, it is evident from this perspective that the first positioning device 147, as in connection with the Figure 2described, has two first drives 143 and two first spindles 144. Furthermore, the second positioning device 148, as described in connection with the Figure 2 The described components include two second drives 145 and two second spindles 146. Furthermore, the respective transmission devices 141 and 142 each have a cuboid shape with rounded ends.

[0034] The Figure 4 Figure 1 shows the chair 100 for treating the patient in a fourth embodiment. The chair 100 can be used like the one in connection with the Figure 3The chair described above is designed as follows. In the present embodiment, the chair 100 additionally features upholstery elements arranged on the seat element 110, the back element 120, and the headrest 150. Preferably, the upholstery elements comprise an air-permeable membrane. This allows for optimal air circulation, thus counteracting perspiration by the patient. Furthermore, it can be seen from this perspective that the first spindles 144 extend orthogonally to a bearing axis of the first bearing element 111, and the second spindles 146 extend orthogonally to a bearing axis of the second bearing element 121. To stabilize the chair 100 laterally, it is possible to arrange an additional linear guide parallel to the first spindle 144 and / or the second spindle 146.The linear guide could, for example, be designed as a simple guide rail which is slidably connected to the first transmission device 141 and / or the second transmission device 142, thus making it more difficult for the chair 100 to tilt sideways.

[0035] The Figure 5 shows chair 100 for treating the patient according to a further embodiment. Chair 100 can be used like the one in connection with the Figure 4The chair described above is designed as follows. In the present embodiment, the adjusting device 140 of the chair 100 is additionally housed in a casing 149. By housing the adjusting device 140 in the casing 149, the casing 149 serves as a base. This makes it possible to position the adjusting device 140 at a distance below the seat element 110 and the back element 120. The adjusting device 140 thus engages the first bearing element 111 and the second bearing element 121 from within the casing 149.

[0036] The Figures 6a to 6h They show chair 100 for treating the patient according to a further embodiment in different positions. Figure 6aFigure 1 shows chair 100 in a low entry position, which facilitates entry into chair 100 for the patient. In the entry position, the seat element 110 is in a low position, for example, close to the housing 149, and the back element 120 is in an upright position. Furthermore, the figure shows Figure 6b Chair 100 is positioned in a conversation position, in which the seat element 110 and the back element 120 are slightly raised compared to the entry position. In the conversation position, the patient can be raised vertically so that they are at eye level with the person treating them, creating a more comfortable atmosphere for discussion.

[0037] The Figure 6c Figure 100 shows chair 100 in a first reclining position, in which the backrest element 120 is slightly reclined so that the patient's upper body is positioned above their lower body. Furthermore, the figure shows... Figure 6dThe chair 100 is in a second reclining position in which the back element 120 is reclined so that the patient's upper and lower body are at the same height. Furthermore, the Figure 6e The chair 100 in a third reclining position. Compared to the second reclining position, in the third reclining position the chair 100 is raised vertically as a whole to facilitate treatment of the patient by a standing person. Figure 6f The figure also shows chair 100 in a fourth reclining position, in which the back element 120 is reclined in such a way that the patient's upper body is below their lower body. Figures 6g and 6h The images show the chair 100 in a fifth and a sixth reclining position, each of which is suitable for specific treatments on the patient and requires such a reclining position.

Claims

1. A chair (100) for treating a patient, comprising: a seat element (110) having a first bearing element (111) rigidly attached to the seat element (110); a back element (120) having a second bearing element (121) rigidly attached to the back element (120); a connecting joint (130) connecting the seat element (110) and the back element (120); and an adjusting device (140) engaging the first bearing element (111) and the second bearing element (121) for moving the first bearing element (111) relative to the second bearing element (121), and the adjusting device (140) is arranged in a housing (149) of the chair (100) serving as a stand, characterized in that the seat element (110) and the back element (120) are movable and freely positionable independently of each other by means of the adjusting device (140).

2. The chair (100) according to claim 1, characterized in that the adjusting device (140) engages the first bearing element (111) out of the housing (149) by means of a first transmission device (141) and the second bearing element (121) by means of a second transmission device (142).

3. The chair (100) according to claim 2, characterized in that the transmission devices (141, 142) are each formed by stamps or transmission rods.

4. The chair (100) according to one of the preceding claims, characterized in that the adjusting device (140) comprises a first adjusting device (147) engaging the first bearing element (111) for horizontal or vertical adjustment of the seat element (110).

5. The chair (100) according to claim 4, characterized in that the first adjusting device (147) comprises a first drive (143) and a first transmission device (141) connected to the first bearing element (111).

6. The chair (100) according to claim 4 or 5, characterized in that the first adjusting device (147) comprises a first spindle (144).

7. The chair (100) according to claim 6, characterized in that the longitudinal axis of the first spindle (144) extends orthogonally to a bearing axis of the first bearing element (111).

8. The chair (100) according to one of the preceding claims, characterized in that the first bearing element (111) is designed as an articulated bearing, and that the bearing axis of the first bearing element (111) is an articulated axis of the articulated bearing.

9. The chair (100) according to one of the preceding claims, characterized in that the adjusting device (140) comprises a second adjusting device (148) engaging the second bearing element (121) for horizontal or vertical adjustment of the back element.

10. The chair (100) according to claim 9, characterized in that the second adjusting device (148) comprises a second drive (145) and a second transmission device (142) connected to the second bearing element (121).

11. The chair (100) according to claim 9 or 10, characterized in that the second adjusting device (148) comprises a second spindle (146).

12. The chair (100) according to claim 11, characterized in that the longitudinal axis of the second spindle (146) extends orthogonally to a bearing axis of the second bearing element (121).

13. The chair (100) according to one of the preceding claims, characterized in that the second bearing element (121) is designed as an articulated bearing, and that the bearing axis of the second bearing element (121) is an articulated axis of the articulated bearing.

14. The chair (100) according to one of the preceding claims, characterized in that the connecting joint (130) is designed as a double joint.

15. The chair (100) according to one of the preceding claims, characterized in that the connecting joint (130) comprises an angled spacer (131).

Images