Chair rest assembly and method of operating such a rest assembly

Abstract

A rest assembly (1) for a chair (2) having a seat portion (3). This rest assembly (1) comprises a positioning base unit (4) adapted to be disposed on the chair (2), a rest portion (5), and a support member (6). The positioning base unit (4) comprises an upper portion and first and second side walls disposed to face each other, and a receiving compartment is provided between these side walls.

Description

Technical Field

[0001] The present invention relates to a rest assembly for a chair and a chair having a seat portion including the rest assembly. The present invention further relates to a method of operating the rest assembly.

Background Art

[0002] A rest assembly for a chair can be configured to provide assistance and support to a person who needs additional support, such as legs, head, or arms, while sitting on the chair. For example, a patient can place their legs in a rest position on a leg rest while sitting on the chair. Reasons for placing the legs in a rest position on the leg rest include knee, joint, back, or other problems. A chair having a leg rest assembly can be very useful as it can reduce pain resulting from, for example, low back pain. Similar situations related to rest assemblies configured for arms or head are conceivable where the rest assembly can provide additional support and comfort to a patient while sitting on the chair.

[0003] A rest assembly for a chair may have various structures and mechanisms depending on how it is arranged and connected to the chair. Generally, a rest assembly for legs, head, or arms is attached to the chair by a mechanism consisting of many parts. During patient care, for example, when it is necessary to clean the rest assembly, it is often necessary to attach and detach the rest assembly from the chair. It is also common for the rest assembly to be rotationally adjustable to suit the patient's physical needs while the patient is sitting on the chair.

[0004] US2013181498A1 shows an example of a rotatable rest assembly having both attachment and release functions. The drawback of the rest assembly described in US2013181498A1 is that its rotation mechanism is composed of many internal parts and different components. When all the parts are put together, the operation of the rest assembly and its attachment to and detachment from the chair become difficult and time-consuming.

Summary of the Invention

[0005] An object of the present invention is to provide a rest assembly having a rotation mechanism that is easy to use and has fewer internal parts to facilitate operation compared to those of the prior art.

[0006] In connection with the above object, a further object is to provide a method of operating a rest assembly between a mounting / detaching position, an active position, and a passive position.

[0007] These objects are achieved by the rest assembly according to claim 1, a chair having the rest assembly according to claim 17, and a method of operating the rest assembly according to claim 18.

[0008] A rest assembly for a chair having a seat portion includes a positioning base unit adopted to be disposed on the chair, a rest portion, and a support member. The positioning base unit includes an upper portion and first and second side walls disposed facing each other, and a receiving compartment is provided between the side walls. The support member includes a first support arm having a first engaging portion, and the first support arm is provided on the rest portion. The first engaging portion is rotatably disposed in the receiving compartment of the positioning base unit when in the active position, and is adopted to alternately change the position of the rest portion between the active position and the mounting / detaching position with respect to the positioning base unit. The support member includes a second support arm, and at least one of the support arms is elastic with respect to the other support arm and releasably engages with an engaging assembly disposed in the receiving compartment. The effect of the support arms being elastic with respect to each other is to enable the support arms to be pressed against each other. A person can grasp around the two support arms by hand and firmly press the two support arms against each other.

[0009] According to one embodiment, the engagement assembly includes first and second knob elements disposed on respective sidewalls, each knob element protruding from its respective sidewall toward the other. The knob elements are attached inside the sidewalls. The effect of the knob elements is to enable the knob elements to removably attach to the support arm in cooperation with the support arm when the support arm is disposed within the receiving compartment. A further effect of the knob elements is that when the rest portion is in the passive position, the knob elements support a portion of the weight of the rest portion via the attached support arm.

[0010] According to one embodiment, on respective sidewalls facing each other, at the lower part of the positioning base unit, first and second shelf elements are provided to protrude from their respective sidewalls toward each other. The shelf elements are disposed in the lower peripheral region inside the sidewalls. The shelf elements extend away from the inside of the surface of the sidewalls and toward the center of the positioning base unit. The effect of the shelf portion is that it can receive and support the support arm when the rest assembly is in the active position. In the active position, the support arm is rotatably disposed on the knob element and simultaneously contacts the shelf element.

[0011] According to one embodiment, the receiving compartment includes a central reinforcing element provided with first and second reinforcing walls, the first and second reinforcing walls facing their respective sidewalls, whereby a first space is provided between the first sidewall and the first reinforcing wall and a second space is provided between the second sidewall and the second reinforcing wall. The central reinforcing element is provided together with the upper and lower parts of the positioning base unit. The effect of the central reinforcing element is to create the stability and rigidity of the positioning base unit.

[0012] According to one embodiment, the central reinforcing element comprises a recess extending between a first reinforcing wall and a second reinforcing wall. The recess extends between a first space and a second space. The recess is formed at the center of the receiving compartment between an upper portion and a lower portion and between the first reinforcing wall and the second reinforcing wall. The effect of this recess is to reduce stress concentration in the material of the positioning base unit that may occur during use. By reducing stress concentration, the risk of cracks occurring in the material of the positioning base unit is further reduced.

[0013] According to one embodiment, in relation to the first and second spaces, the central reinforcing element includes respective first and second slot walls disposed at the lower part of the support member. Compared with the respective reinforcing walls, each slot wall is disposed at a closer distance to the respective side wall. The effect of each slot wall is to prevent the support arm from being released and falling from the receiving compartment when the restore assembly is in the active position.

[0014] According to one embodiment, the first and second spaces each include respective first and second slots. The first slot is defined between the first slot wall and the first side wall, and the second slot is defined between the second slot wall and the second side wall. The respective first and second slots extend from the entrance regions of the first and second spaces toward the interior of the respective spaces. Each slot is disposed parallel to the respective side wall. Each slot is disposed on each side of the lower part of the central reinforcing element in the respective first and second spaces. The width of each slot is set to receive the engaging portion of the support arm. In the direction from the inner surface of the side wall toward the center of the positioning base unit, the sum of the width of one shelf element in that direction and the width of one slot is shorter than the length of the knob element extending from the side wall. The effect of the slot is to guide the support arm between the active position and the passive position. A further effect of the slot is to prevent the slot from moving laterally toward one side of the chair in the rest portion.

[0015] According to one embodiment, the first and second support arms each include respective first and second engagement portions adapted to engage an engagement assembly within the first and second spaces by an elastic movement of at least one of the first and second support arms. The support arms include a metallic material. A second material having plastic properties wraps a majority of the length of the support arms. The first and second support arms are arranged parallel to each other and are connected to and extend from a frame provided in the legrest assembly. The effect of the first and second engagement portions is to engage and lock with the engagement assembly.

[0016] According to one embodiment, each of the first and second engagement portions includes respective engagement surfaces, each of those engagement surfaces including respective holes for engaging a knob element within the respective first and second spaces. Those holes have a diameter slightly larger than the diameter of the knob element. Each support arm elastically returns towards its original position when an applied pressing force is released, so that when the first and second support arms are pressed towards each other and move to an engaged position, the knob can be inserted into and positioned within the hole of the engagement portion. The effect of the holes is to receive the knob element and function as a connector between the positioning base unit and the support arm.

[0017] According to one embodiment, each of the first and second engagement portions includes respective slide surfaces, those slide surfaces being connected to the respective engagement surfaces and angled towards the other support arm with respect to the respective engagement surfaces. The effect of the angled slide surfaces is that when the support arm enters the engaged position, the support arm moves towards the other support arm as the angled slide surfaces slide-contact the knob element. Without the angled slide surfaces, there is a risk that its edge may collide with the knob element, thereby preventing entry into the engaged position.

[0018] According to one embodiment, when a rotational movement is applied to the positioning base unit by the support arm, each of the respective sliding surfaces has a rounded edge so as to conform to the inner surfaces of the respective first and second spaces. The effect of the rounded edge is that the knob element can be arranged more centrally on the side wall compared to the case where the edge is not rounded (in the case where the edge is not rounded, the knob needs to be arranged closer to the periphery of the side wall, so the structure of the side wall may be weakened).

[0019] According to one embodiment, the width of each engaging surface in the region including each hole is longer than the width of each support arm in the region where the plastic material of the support arm ends. The effect of the increased width in the region including the hole is that the engaging portion including the engaging surface is stronger and more rigid compared to the case where the region is not wide.

[0020] According to one embodiment, in the mounting / detaching position, the first and second support arms each having an engaging portion are arranged in the respective first and second spaces, the first engaging portion is arranged to elastically move between the first side wall and the first reinforcing wall and pass through the first slot wall, and the second engaging portion is arranged to elastically move between the second side wall and the second reinforcing wall and pass through the second slot wall. The effect of the mounting / detaching position is that in this position, the rest portion can be attached to the positioning base unit or detached from the engagement with the positioning base unit.

[0021] According to one embodiment, in the active position, the first and second support arms each having an engaging portion are disposed in the lower region with respect to their respective side walls, the first engaging portion is disposed to face the first slot wall and support - contact the first shelf element toward the first side wall, and the second engaging portion is disposed to face the second slot wall and support - contact the second shelf element (18b) toward the second side wall. In the active position, the support arms are not in the compressed position, the knob element is disposed in the hole of the support arm, and the support arm contacts the shelf element. The effect of the shelf element is that it can support, maintain, and hold the active position of the rest portion. In the active position, each slot wall prevents the support arm from being accidentally released.

[0022] According to one embodiment, in the passive position, the first and second support arms each having an engaging portion are disposed in their respective slots. To transition to the passive position, a compressive force needs to be applied to the first and second support arms to press them in a direction toward each other, thereby reducing the distance between the first and second engaging portions. In the positioning base unit, the slots are parallel to each other. Further, the slots that are parallel to each other have a distance between them that is shorter than the distance between the oppositely - disposed side walls. Further, the slots are arranged to cooperate with the engaging assembly of each support arm. The effect of each slot is that they receive and guide the first and second support arms respectively in the rotational movement between the active position and the passive position.

[0023] According to one embodiment, the rest assembly is a leg rest assembly. The effect of the rest assembly being a leg rest assembly is that the leg rest assembly can support the patient's legs while the patient is sitting on the chair.

[0024] According to one embodiment, the present invention further relates to a chair having a seat portion including the rest assembly. The rest assembly has the features described above and outlined.

[0025] According to one embodiment, the present invention also relates to a method of operating a legrest assembly. More specifically, this method is directed to a method of engaging a rest assembly between a mounting / detaching position, an active position, and a passive position, the method comprising: - applying a compressive force to at least one of the first and second support arms, whereby the respective first and second engaging portions are arranged to move towards each other; - placing the respective first and second engaging portions within the respective first and second spaces of the receiving compartment; - releasing the compressive force on the first and second support arms, whereby in the respective first and second spaces, the respective first and second engaging portions move away from the respective first and second reinforcing walls and towards the respective first and second side walls, and the respective first and second sliding surfaces engage with the respective engaging assemblies arranged in the respective first and second spaces 20, 21 to reach the mounting / detaching position; - moving the first and second support arms having the respective engaging portions from the mounting / detaching position by a rotational movement towards a position arranged to face the respective slot walls and to support - contact the respective shelf elements to reach the active position; - applying a compressive force to at least one of the first and second support arms, whereby the first and second engaging portions move towards each other and away from the respective shelf elements towards the respective slot walls, and the respective first and second engaging portions are arranged in the respective first and second slots; - applying a rotational movement to the first and second support arms, whereby the first and second support arms having the respective first and second engaging portions move from the active position to the passive position within the respective first and second slots.

[0026] This method enables the rest part to be releasably engaged with the positioning base unit. The effect of this method is that the rest part can be placed on the positioning base unit with one hand operation. In this hand operation, the person grasps around the first and second support arms with the hand, firmly squeezes the support arms towards each other while holding them tightly, and moves the support arms having respective engaging portions to a fixed position within the receiving compartment of the positioning base unit.

[0027] When separating the rest part from the positioning base unit, the person grasps around the support arms with the hand and lifts the rest part from the passive position to the active position. At the active position, the person firmly squeezes the support arms, moves them towards each other, and by rotating the support arms, the engaging portions move away from the slot walls where they are oppositely arranged and are arranged in the first and second spaces. In each of the first and second spaces, the engaging portions are pressed towards the respective reinforcing walls, and each knob element is released from its respective position in the respective hole of each of the first and second engaging portions. When the knob is released from the hole, the rest part is separated from the positioning base unit together with the support arms and can move in a direction away from the positioning base unit.

Brief Description of the Drawings

[0028] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

DETAILED DESCRIPTION OF THE INVENTION

[0029] FIGS. 1, 2, and 3 show a chair 2 having a seat portion 3. The illustrated chair 2 is preferably provided with a lifting device together with wheels for seating a patient. A rest assembly 1 is provided on the seat portion 3. The seat portion 3 has a rear portion and a front portion. Here, the front portion is regarded as the portion when a person sits on the seat portion 3 and bends the lower leg downward. The rest assembly 1 includes a positioning base unit 4, a rest portion 5, and a support member 6. The support member 6 is connected to the rest portion 5. The positioning base unit 4 is disposed in the region of the lower surface and the front portion of the seat portion 3. The support member 6 is detachably provided on the positioning base unit 4. In the engagement position between the positioning base unit 4 and the support member 6, the support member 6, together with the connected rest portion 5, is disposed at the attachment / detachment position 31 in FIG. 1, the active position 12 in FIG. 2, or the passive position 13 in FIG. 3.

[0030] Figure 4 shows the positioning base unit 6 together with four cutting plane lines A-A, B-B, C-C, D-D in order to explain the design and structure of the positioning base unit 6 by various cross-sectional views A-A, B-B, C-C, D-D. The positioning base unit 6 comprises an upper part 7 configured to be attached to the lower surface of the seat part 3 of FIGS. 1 and 2. The positioning base unit 6 further comprises an entrance region 24. The entrance region 24 is an opening provided between a first and a second side wall 8a, 8b arranged parallel to each other and facing each other. Each side wall 8a, 8b is further arranged between the peripheral regions of the upper part 7 and the lower part 17 of the positioning base unit 6. In the position where the positioning base unit 6 and the seat part 3 are arranged relative to each other (FIGS. 1 to 3), the entrance region 24 is arranged so as to face the front part of the seat part 3.

[0031] FIG. 4, cross-sectional views A-A and B-B show the entrance region 24, which is an opening leading to the receiving compartment 9.

[0032] Referring to FIGS. 4, cross-sectional views C-C and D-D, the receiving compartment 9 is defined by the side walls 8a, 8b, the upper part 7 and the lower part 17 arranged opposite to the inside of the positioning base unit 6. The receiving compartment 9 includes a first space 20 and a second space 21, and a recess 22 is arranged between the first space 20 and the second space 21. The recess 22 is provided in a central reinforcing element 19 connecting the upper part 7 and the lower part 17. The recess 19 is adjacent to a first reinforcing wall 32a and a second reinforcing wall 32b. The first space 20 is defined between the first side wall 8a and the first reinforcing wall 32a. The second space 21 is defined between the second side wall 8b and the second reinforcing wall 32b.

[0033] Inside each of the first and second side walls 8a, 8b, there are provided first and second shelf elements 18a, 18b respectively, facing towards the lower part 17. The respective shelf elements 18a, 18b are arranged opposite to each other. At the lower part 17 of the reinforcing element 19, first and second slot walls 33a, 33b are provided. Between the first shelf element 18a and the first slot wall 33a, a first slot 23a is provided. Between the second shelf element 18b and the second slot wall 33b, a second slot 23b is provided. Each of the slots 23a, 23b extends parallel to the respective side walls 8a, 8b. Further, each of the slots 23a, 23b extends from the entrance region 24 towards the inner walls of the respective first and second spaces 20, 21.

[0034] Each of the first and second spaces 20, 21 includes respective first and second engagement assemblies 14a, 14b. Each of the engagement assemblies 14a, 14b includes respective first and second knob elements 15a, 15b. Each of the knob elements 15a, 15b is arranged inside the respective opposite side walls 8a, 8b. Each of the knob elements 15a, 15b is provided inside the respective side walls 8a, 8b by, for example, an adhesive, welding, brazing, screws, bolt elements, or other means for connecting the knob elements 15a, 15b to the side walls 8a, 8b. Further, the knob elements 15a, 15b may be formed or manufactured together with the side walls 8a, 8b or the positioning base unit 4.

[0035] As shown in the cross-sectional view D-D of FIG. 4, when viewed from the inside of the side walls 8a, 8b, the knob elements 15a, 15b have a length longer than the total length in the same direction of one shelf element 18a, 18b and one slot 23a, 23b arranged in the spaces 20, 21.

[0036] FIG. 5 shows the rest assembly 1 in a separated position. In this position, the rest part 5 is stored or, for example, transported to another facility for cleaning.

[0037] The rest portion 5 includes a first support arm 6a and a second support arm 6b. The first and second support arms 6a, 6b are parallel to each other and are connected to a frame 30 provided on the rest portion 5. The first and second support arms 6a, 6b form one unit together with the rest portion 5. The support arms 6a, 6b extend from one side portion of the rest portion 5.

[0038] The first and second support arms 6a, 6b include respective first and second ends 25a, 25b. The respective first and second ends 25a, 25b are interconnected with the frame 30 of the rest portion 5 via respective first and second connection regions 10a, 10b. On the opposite sides of the ends 25a, 25b of the respective first and second support arms 6a, 6b, respective first and second engaging portions 11a, 11b are provided. The first and second engaging portions 11a, 11b each include an engaging surface 26a, 26b and a sliding surface 28a, 28b. The respective engaging surfaces 26a, 26b include respective holes 27a, 27b. The respective sliding surfaces 28a, 28b are adjacent to the respective engaging surfaces 26a, 26b. The respective sliding surfaces 28a, 28b are angled towards each other with respect to the portions of the respective first and second support arms 6a, 6b that extend parallel. The respective sliding surfaces 28a, 28b include respective rounded edges 29a, 29b as shown in FIG. 8 and are adapted to conform to the inner surfaces of the respective first and second spaces 20, 21 when a rotational movement is applied to the support arms 6a, 6b with respect to the positioning base unit 4.

[0039] FIG. 6 shows the forces F applied to the first and second support arms 6a, 6b, whereby the support arms 6a, 6b having the first and second engaging portions 11a, 11b are configured to move towards each other. The support arms 6a, 6b are formed from an elastic material, whereby the support arms 6a, 6b can elastically return to their original shape or position when the force F is removed. In the operation where the support arms 6a, 6b are pressed towards each other, the support arms 6a, 6b are moved to the engagement position (FIG. 6) together with their respective first and second engaging portions 11a, 11b. When the engaging portions 11a, 11b enter the spaces 20, 21, the angled slide surfaces 28a, 28b are configured to slidably engage with the knob elements 15a, 15b in their respective spaces 20, 21. The angled slide surfaces 28a, 28b contribute to the support arms 6a, 6b being pressed towards each other as the engaging portions 11a, 11b move into their respective spaces 20, 21 and slide against the knob elements 15a, 15b. The angled slide surfaces 28a, 28b are adjacent to the engaging surfaces 26a, 26b, which are provided with holes 27a, 27b arranged to receive their respective knob elements 15a, 15b.

[0040] FIG. 7 shows the respective engaging portions 11a, 11b arranged in the engagement positions within the spaces 20, 21, and the holes 27a, 27b are arranged to receive the knob elements 15a, 15b, whereby the support arms 6a, 6b have elastically returned to approximately their original positions. In this position, the support arms 6a, 6b are connected to the knob elements 15a, 15b and are transitioning to the attachment / detachment position shown in FIG. 1. In the second step after the attachment / detachment position, the respective engaging portions 11a, 11b pivot towards their respective shelf elements 18a, 18b, contact their respective shelf elements 18a, 18b, and the restore assembly 1 assumes the active position shown in FIG. 2.

[0041] In the situation where the restore assembly 1 is on the chair 2 but in the passive position 13 (see Figure 3), the restore assembly 1 is further angled to facilitate the movement of a patient sitting on the chair 2. The passive position 13 is achieved by slightly pushing the support arms 6a, 6b in the active position 12 while the knob elements 15a, 15 remain disposed in the holes 27a, 27b. From the active position 12, by slightly pushing the support arms 6a, 6b together, the respective engaging portions 11a, 11b are released from the shelf elements 18a, 18b and are disposed towards the respective first and second slot walls 33a, 33b. In this position, the support arms are slidably disposed within the slots 23a, 23b and are arranged to pivot away from the entrance region 24 towards the respective ends of the respective slots 23a, 23b. The respective ends of the respective slots 23a, 23b are disposed on the side opposite to the entrance region 24.

[0042] To release the support arms 6a, 6b, it is necessary to pivot the support arms 6a, 6b from the passive position 13 within the respective slots 23a, 23b to the active position 12 shown in Figure 2. At this active position 12, when a force F is applied to the support arms 6a, 6b, the support arms 6a, 6b can be pressed towards each other until the respective engaging portions 11a, 11b are no longer movable by the respective slot walls 33a, 33b. To further the release of the support arms 6a, 6b, the support arms 6a, 6b are pivoted away from the respective shelf elements 18a, 18b and the respective slot walls 33a, 33b. In the first and second spaces 20, 21, the respective engaging portions 11a, 11b can be further pressed towards each other and towards the respective reinforcing walls 32a, 32b until the respective knob elements 15a, 15b are released and are no longer disposed within the respective holes 27a, 27b of the respective engaging portions 11a, 11b. In this position, the restore assembly is in the release position 31 and the support arms 6a, 6b can be separated from the positioning base unit 4.

[0043] FIG. 8 shows the lower surface of the rest portion 5 including a frame 30 extending around the periphery of the lower surface of the rest portion 5. The support arms 6a, 6b are provided on the frame 30 at connection regions 10a, 10b on the frame 30.

[0044] Cross-sectional view A-A of FIG. 8 shows a cross-section of the rest portion 5 in the active position 12. In the active position 12, the support arms 6a, 6b are arranged in a direction substantially parallel to each other and are not pressed against each other. Further, in the active position 12, the engaging portions 11a, 11b engage with the knob elements 15a, 15b through holes 27a, 27b provided therein and contact the shelf elements 18a, 18b. The lower edges of the respective engaging portions 11a, 11b are arranged to contact the respective shelf elements 18a, 18b. In this position, the support arms 6a, 6b, together with the rest portion 5, are arranged at a position between being substantially horizontal and having a certain downward inclination. The active position 12 is a position arranged between the mounting / detaching position 31 and the passive position 13 as shown in FIGS. 1 to 3.

[0045] So far, it has been described that the rest assembly is provided on a chair, preferably a patient chair. However, it should be understood that the above-described principle can also be applied to other types of chairs, and can also be applied to various types of rest assemblies such as leg rests, head rests or arm rests.

Explanation of reference numerals

[0046] 1 Rest assembly such as a leg 2 Chair 3 Seat portion 4 Positioning base unit 5 Rest portion such as a leg 6 Support member 6a First support arm 6b Second support arm 7 Upper portion 8a First side wall 8b Second side wall 9 Receiving compartment 10a First connection region 10b Second connection area 11a First engaging part 11b Second engaging part 12 Active position 13 Passive position 14a, b Engaging assembly 15a First knob element 15b Second knob element 16a, b Edge protruding element 17 Lower part 18a First shelf element 18b Second shelf element 19 Central reinforcing element 20 First space 21 Second space 22 Recess 23a First slot 23b Second slot 24 Entrance area 25a First end 25b Second end 26a, b Engaging surface 27a, b Hole 28a, b Slide surface 29a, b Rounded edge 30 Frame 31 Mounting / detaching position 32a First reinforcing wall 32b Second reinforcing wall 33a First slot wall 33b Second slot wall Force F

Claims

1. A rest assembly (1) for a chair (2) having a seat part (3), comprising: A positioning base unit (4) adapted to be arranged on the chair (2); A rest part (5); And a support member (6), The positioning base unit (4) comprises an upper part (7) and first and second side walls (8a, 8b) arranged to face each other, and a receiving compartment (9) is provided between the side walls (8a, 8b); The support member (6) comprises a first support arm (6a) having a first engaging part (11a), the first support arm (6a) is provided on the rest part (5), and when the first engaging part (11a) is in the active position (12), it is rotatably arranged in the receiving compartment (9) of the positioning base unit (4), and is adapted to alternately change the position of the rest part (5) between the active position (12) and the mounting / detaching position (31) with respect to the positioning base unit (4); The support member (6) comprises a second support arm (6b), at least one of the support arms (6a, 6b) is elastic with respect to the other support arm (6a, 6b), and is releasably engaged with an engaging assembly (14a, 14b) arranged in the receiving compartment (9). A rest assembly characterized by this.

2. In the rest assembly (1) according to Claim 1, The engaging assembly (14a, 14b) includes first and second knob elements (15a, 15b) provided on the respective side walls (8a, 8b), and the respective knob elements (15a, 15b) protrude from the respective side walls (8a, 8b) towards each other. A rest assembly characterized by this.

3. In the rest assembly (1) according to Claim 1 or 2, On the respective side walls (8a, 8b) facing each other, first and second shelf elements (18a, 18b) of the positioning base unit (4) are provided so as to protrude from the respective side walls (8a, 8b) towards each other. A rest assembly characterized by this.

4. In the rest assembly (1) according to Claim 1, The receiving compartment (9) comprises a central reinforcing element (19) provided with respective first and second reinforcing walls (32a, 32b), the first and second reinforcing walls facing towards respective side walls (8a, 8b), whereby a first space (20) is provided between the first side wall (8a) and the first reinforcing wall (32a), and a second space (21) is provided between the second side wall (8b) and the second reinforcing wall (32b), a restore assembly characterized thereby.

5. In the restore assembly (1) according to claim 4, the central reinforcing element (19) comprises a recess (22) extending between the first and second reinforcing walls (32a, 32b), a restore assembly characterized thereby.

6. In the restore assembly (1) according to claim 5, in relation to the first and second spaces (20, 21), the central reinforcing element (19) comprises respective first and second slot walls (33a, 33b) arranged at a lower part (17) of the support member (6), the slot walls being arranged at a distance closer to respective side walls (8a, 8b) than respective reinforcing walls (32a, 32b), a restore assembly characterized thereby.

7. In the restore assembly (1) according to claim 4, the first and second spaces (20, 21) include respective first and second slots (23a, 23b), the first slot (23a) being defined between the first slot wall (33a) and the first side wall (8a), the second slot (23b) being defined between the second slot wall (33b) and the second side wall (8b), the respective first and second slots (23a, 23b) extending from an entrance region (24) of the first and second spaces (20, 21) towards the interior of the respective spaces (20, 21), the respective slots (23a, 23b) being arranged parallel to the respective side walls (8a, 8b), a restore assembly characterized thereby.

8. In the restore assembly (1) according to claim 1, The first and second support arms (6a, 6b) are each provided with respective first and second engaging portions (11a, 11b) adapted to engage the engaging assemblies (14a, 14b) within the first and second spaces (20, 21) by elastic movement of at least one of the first and second support arms (6a, 6b). A restore assembly characterized by this.

9. In the restore assembly (1) according to claim 8, Each of the first and second engaging portions (11a, 11b) includes respective engaging surfaces (26a, 26b), and the engaging surfaces include respective holes (27a, 27b) for engaging the knob elements (15a, 15b) within the first and second spaces (20, 21). A restore assembly characterized by this.

10. In the restore assembly (1) according to claim 9, Each of the first and second engaging portions (11a, 11b) includes respective sliding surfaces (28a, 28b), the sliding surfaces are connected to the respective engaging surfaces (26a, 26b), and are angled towards the other support arm (6a, 6b) with respect to the respective engaging surfaces (26a, 26b). A restore assembly characterized by this.

11. In the restore assembly (1) according to claim 10, When a rotational movement is applied to the positioning base unit (4) by the support arms (6a, 6b), each of the respective sliding surfaces (28a, 28b) has rounded edges (29a, 29b) so as to conform to the inner surfaces of the first and second spaces (20, 21). A restore assembly characterized by this.

12. In the restore assembly (1) according to claim 9, The width of each of the respective engaging surfaces (26a, 26b) in the region including the respective holes (27a, 27b) is longer than the width of each of the support arms (6a, 6b) in the region where the plastic material of the support arms (6a, 6b) ends. A restore assembly characterized by this.

13. In the restore assembly (1) according to claim 6, In the attachment / detachment position (31), first and second support arms (6a, 6b) each having an engaging portion (11a, 11b) are disposed in respective first and second spaces (20, 21), and the first engaging portion (11a) is elastically movable between the first side wall (8a) and the first reinforcing wall (32a) and is disposed so as to pass through the first slot wall (33a), and the second engaging portion (11b) is elastically movable between the second side wall (8b) and the second reinforcing wall (32b) and is disposed so as to pass through the second slot wall (33b). A restore assembly characterized by that.

14. In the restore assembly (1) according to claim 6, In the active position (5), first and second support arms (6a, 6b) each having an engaging portion (11a, 11b) are disposed in a lower region with respect to respective side walls (8a, 8b), and the first engaging portion (11a) is disposed so as to face the first slot wall (33a) and be in supporting contact with the first shelf element (18a) toward the first side wall (8a), and the second engaging portion (11b) is disposed so as to face the second slot wall (33b) and be in supporting contact with the second shelf element (18b) toward the second side wall (8b). A restore assembly characterized by that.

15. In the restore assembly (1) according to claim 7, In the passive position (5), first and second support arms (6a, 6b) each having an engaging portion (11a, 11b) are disposed in respective slots (23a, 23b). A restore assembly characterized by that.

16. In the restore assembly (1) according to any one of claims 1 to 15, A restore assembly, characterized in that the restore assembly (1) is a leg restore assembly.

17. A chair (2), Comprising a seat portion (3) including the restore assembly (1) according to any one of claims 1 to 16. A chair characterized by that.

18. A method of engaging the restore assembly (1) according to any one of claims 1 to 17 between an attachment / detachment position (31), an active position (12), and a passive position (13), - applying a compressive force F to at least one of the first and second support arms (6a, 6b), whereby the respective first and second engagement portions (11a, 11b) are arranged to move towards each other; - arranging the respective first and second engagement portions (11a, 11b) within the respective first and second spaces (20, 21) of the receiving compartment (9); - releasing the compressive force F on the first and second support arms (6a, 6b), whereby in the respective first and second spaces (20, 21), the respective first and second engagement portions (11a, 11b) move away from the respective first and second reinforcing walls (32a, 32b) and towards the respective first and second side walls (8a, 8b), and the respective first and second sliding surfaces (26, 28) engage with the respective engagement assemblies (14a, 14b) arranged in the respective first and second spaces (20, 21) to reach the mounting / dismounting position (31); - moving the first and second support arms (6a, 6b) each having a respective engagement portion (11a, 11b) from the mounting / dismounting position (31) by a rotational movement to a position arranged to face the respective slot walls (33a, 33b) and to be in supporting contact with the respective shelf elements (18a, 18b) to reach the active position (12); - applying a compressive force F to at least one of the first and second support arms (6a, 6b), whereby the first and second engagement portions (11a, 11b) move towards each other and away from the respective shelf elements (18a, 18b) towards the respective slot walls (33a, b), and the respective first and second engagement portions (11a, 11b) are arranged in the first and second slots (23a, 23b); - applying a rotational movement to the first and second support arms (6a, 6b), whereby the first and second support arms (6a, 6b) each having a first and second engagement portion (11a, 11b) move within the respective first and second slots (23a, 23b) from the active position (12) to the passive position (13). A method characterized by comprising the step of

Images