JP2014528311A - Chair - Google Patents

Abstract

The chair includes a seat, a backrest, a frame having a curved rail, and a runner movable along the rail. The seat and back are carried by the runner so that they can move together along the rail, and the position of the back with respect to the seat changes horizontally as the seat and back moves along the rail. Furthermore, the seat part whose height can be adjusted can be folded.

Description

  The present invention relates to a chair with adjustable seat height.

  The chairs used by students and students at school usually consist of a metal frame that is not adjustable and has a fixed size. Such chairs are used by students / students of various heights and sometimes very different body characteristics, so that they correspond to the optimal posture of only a few individual users. Such chairs do not fit the size for many, if not most, students / students. This problem is more pronounced in elementary schools, as growth progresses significantly between the ages of 5-11. In elementary school, students are in various stages of development and their physiques are very different from each other. Being in the wrong posture during the child's body development can have serious consequences for bone structure and body growth.

  An object of this invention is to solve said problem by providing the chair which can match | combine a user's physique easily, correct | amending each user's attitude | position.

  According to a first aspect of the present invention, a chair includes a seat, a backrest, a frame having a curved rail, and a runner movable along the rail, the seat and the backrest along the rail. The position of the backrest relative to the seat changes horizontally as the seat and backrest move along the rail. In this case, raising and lowering the seat has an effect of automatically adjusting the position of the backrest in consideration of the size of the body of the person using the chair.

  Preferably, the rail is composed of a pair of convex side rails. This allows the seat and back to be supported on both sides.

  Preferably, the backrest is movable along a passage defined in the rail, and further the bottom of the passage is arranged towards the front of the chair and the top of the passage is arranged towards the rear of the chair The passage is advantageously shaped so that the relative position of the seat and the backrest is automatically adjusted according to the physique of the person using the chair.

  Preferably, the backrest is rotatably attached to the connecting means, the connecting means being movable along the rail passage. This gives the chair a convenient and efficient structure. The connecting means can move angularly so that the seat portion and the backrest move along the rail and the position of the backrest relative to the seat changes in the horizontal direction. This can be accomplished by shaping the passage so that the connecting means advances along the rail and the connecting means is moved angularly to further adjust the position of the backrest relative to the seat.

The chair can include a set of securing elements that define a range of heights to which the seat can be secured, and engages the set of securing elements so that the seat can be arbitrarily positioned at multiple locations along the rail. A locking device that locks onto one of the two can be incorporated. The locking device preferably includes a tapered bolt and the securing element includes a tapered hole into which the bolt fits. This allows a very solid and secure seat lock that not only reduces the possibility of the seat twisting but also increases the overall stiffness of the chair. The locking device can include a locking body that houses the locking device and the securing element at the point where they engage.

  It is also advantageous that the chair can be folded for storage, so that the frame further includes a pair of legs, each leg through which the chair moves through a rotational movement between the legs and the side rail. Preferably, it is rotatably connected to one side rail so that it can transition between an open state and a folded state. Advantageously, the chair is configured to move the chair to a folded state so that the seat is brought to a position that is substantially flat with respect to the back and / or the rest of the chair.

  The chair may further include an upright support and a base support configured to be coupled to each side rail. Each side rail and the upright support and base support coupled thereto can form a generally triangular shape when the chair is in an open state, the upright support can include a passageway, and the base support The body may include a guide portion that is movable along the passageway, so that the chair can transition between an open state and a folded state through movement of the guide portion along the passageway.

  According to a second aspect of the present invention, a chair has a seat, a pair of side rails supported between the seat and a series of fixing elements that delimit the height of the seat on both sides. A lock attached to the frame and to the seat, and configured to engage the locking element to lock the seat to any one of a plurality of heights corresponding to the position of the locking element on both sides of the frame Including the device. The height adjustment function of the chair is important because it is easy for the person to adjust the height of the seat on which the person is seated so as to optimize the posture of the person.

  Each fixation element preferably includes a fixation point. The locking device preferably includes a tapered bolt and the securing element includes a tapered hole into which the bolt fits. This allows a very solid and secure seat lock that not only reduces the possibility of the seat twisting but also increases the overall stiffness of the chair. The locking device can include a locking body that houses the locking device and the securing element at the point where they engage.

  The locking device can include a handle and a set of bolts extending between a fixed point on the first side rail and a corresponding fixed point on the second side rail, the handle being fixed by the bolt. Allows to extend into a point or retract from a fixed point. In this way, a secure lock is achieved. The bolt can be connected to the handle via a link plate.

  Preferably, the frame includes a pair of legs, each leg allowing a chair to transition between an open state and a folded state through rotational movement between the legs and the side rails. It is rotatably connected to the side rail. In the folded state, the seat is flattened and folded with the rest of the chair and / or the backrest.

  The fixing element and the locking device can be configured to fix the angle of the seat relative to the floor horizontally or at a predetermined angle relative to the floor. Advantageously, the fixing element is provided on the side rail, but in another embodiment one is arranged on the side rail and the other is arranged on a support attached to the legs.

  Preferably, the chair includes a backrest, and in one embodiment, a runner is incorporated that connects the seat to the backrest and is movable along the side rails.

In such cases, the horizontal position of the backrest relative to the seat can change as the height of the seat is adjusted. In an embodiment of the invention, this is achieved by having curved first and second side rails.

  According to a third aspect of the present invention, a foldable chair includes a seat and a frame for supporting the seat having a side rail and a leg carried by the side rail, the chair comprising: Switch between an unfolded state with the legs widened and a folded state where the legs move to the retracted position and move the seat so that it is substantially flat with the rest of the chair be able to.

  The side rails and legs can constitute a side frame, and the frame can include two side frames with a seat and a backrest supported therebetween. Advantageously, the height of the seat is adjustable and the seat is folded flat regardless of the locked height.

  Similar to the previous embodiment, the frame can include a series of anchoring elements that define a seat height range on either side of the frame.

  According to a fourth aspect of the present invention, the chair includes a backrest, a seat portion, and a frame having a pair of side rails supported between the seat portion and the backrest, the backrest being supported by a backrest support member. A backrest support member is rotatably mounted on the frame and is configured to move along the side rail and to change the position of the backrest relative to the seat in the horizontal direction. This allows adjustment of the backrest relative to the seat as the seat is raised and lowered. In addition to the backrest adjustment presented in the first, second, and third aspects of the present invention, this feature can be incorporated.

  The backrest support member can be moved angularly so as to move angularly as the position of the seat changes and to change the position of the backrest relative to the seat in the horizontal direction. The side rail further includes a passage, the back support member can move along the passage, and the passage is shaped to move the back support member angularly as the back support member moves along the rail. Is done.

  The invention will now be described, by way of example only, with reference to the accompanying figures.

1 is a perspective view of a chair according to a first embodiment of the present invention. It is a side view of the chair of FIG. FIG. 2 is a top view of the chair of FIG. 1 showing a seat locking device under the seat. It is sectional drawing of a part of locking device in a lock release position. FIG. 5 is a cross-sectional view of a portion of the locking device shown in FIG. 4 but in the locked position. It is a front view of the chair of FIG. FIG. 2 is a side view of the chair of FIG. 1 in a folded state. It is a perspective view of the chair by the 2nd Embodiment of this invention. It is sectional drawing of the chair of FIG. FIG. 9 is a perspective view of the chair of FIG. 8 with the seat and backrest in the highest position. FIG. 9 is a perspective view of the chair of FIG. 8 with the seat and backrest in the lowest position. FIG. 9 is a perspective view of the chair of FIG. 8 in a folded state. It is a perspective view of a part of the chair of FIG.

A first exemplary embodiment of a chair 100 is shown in FIGS. 1-7, which includes a backrest 10, a seat 11, and a frame carrying the seat 11 and the backrest 10.

  The frame includes a first side rail 30, a second side rail 40, a pair of upright supports 4, and a pair of base supports 5. Side rails 30, 40 are convexly curved and include channels along most of their length. Each of the side rails 30 and 40 is connected to one of the upright supports 4 and one of the base supports 5 to form a substantially triangular harp side frame. The connection between the side rails 30 and 40 and the corresponding upright support 4 and between the side rails 30 and 40 and the corresponding base support 5 is a rotatable connection, and the upright support 4 and the base The connection with the support 5 can be released so that the side frame can be folded, as shown in FIG.

  The upright support 4 has a path formed by the upright support 4 having a I-shaped or C-shaped cross section along the majority of its entire length, in this case, the end of the base support 5 being The guide 6 is connected to the upright support 4 via the guide 6, and engages with the passage of the upright support 4 and is movable along the passage. The movement of the guide 6 along the rail 4 toward the side rails 30 and 40 makes it possible to change the chair from the open state to the folded state. Thus, when in the fully folded state, the chair 100 takes a sufficiently flat configuration (FIG. 7) that allows the chairs to be stacked for ease of storage. As a matter of course, the sufficiently flat configuration may be curved due to the curvature of the first side rail 30 and the second side rail 40. Nevertheless, the various components of the chair are generally aligned in a fully folded state so that the chairs can be stacked and stacked.

  In this embodiment, when the chair is in an open state, the chair cannot be folded due to the weight of the person sitting in the chair and the concave curvature of the upright support, so the guide 6 is not locked in place. However, a locking device can be incorporated to ensure that the chair is not folded unexpectedly.

  The side rails 30 and 40 of the side frames on both sides are connected by a plurality of support rods 7 and the base support 5 is connected by a base rod 8 so as to form a frame that supports the seat 11 and the backrest 10. Yes. When assembled and open, the frame becomes a rigid structure.

  The seat 11 is connected to the backrest 10 by two runners 17, one on each side of the chair to form a seat assembly. The runner 17 is configured to be movable along the first side rail 30 and the second side rail 40 in the channel. As the runner 17 moves along the first and second side rails, the backrest 10 and the seat 11 move accordingly. Since the side rail is inclined with respect to the floor on which the chair is placed, the height of the seat 11 changes as the runner moves. Due to the curved shape of the side rails, the horizontal position of the backrest 10 relative to the seat 11 changes as the height of the seat 11 is adjusted. In particular, when the height of the seat portion 11 is increased by moving the runner 17 toward the upper portion of the side rails 30 and 40, the backrest 10 is disposed to be retracted relative to the seat portion 11. When the runner 17 moves toward the bottom of the side rail and lowers the height of the seat 11, the backrest 10 moves forward relative to the seat 11. This feature deals with users of various physiques and matches the relative positions of the seat 11 and the backrest according to the physique of the user. Therefore, when a small child uses a chair, the seat portion 11 is placed at a low position, and the backrest 10 is designed so as to shorten the effective depth of the seat portion 11 in consideration of the relatively short upper leg length of the user. Automatically placed in front. Later, when a large child uses a chair, the seat 11 is raised to a higher position and the backrest 10 moves backwards to increase the effective depth of the seat and accommodate the longer upper leg length of the user. .

  The backrest 10 is connected to the runner 17 via a rotatable connector 23. The seat 11 is arranged so as to be substantially horizontal, but does not have to be parallel to the floor. The seat 11 needs to be held in a substantially horizontal state and the chair must be configured to allow height adjustment. The features that make this possible are described below mainly with reference to FIGS. The side rail 30 includes a series of fixing elements that define a range of height of the seat 11. As shown in FIG. 2, each fixing element 31 includes a pair of front fixing points 32 and rear fixing points 34. In this embodiment, the fixed point is a hole having a substantially horizontal axis oriented in the lateral direction of the chair. Each pair of fixed points 32, 34 defines a specific height and angle of the seat 11. The two fixed points of each pair are aligned in a substantially horizontal direction.

  The back surface of the seat portion 11 carries a lock device 50 including the lock housing 12 and the handle 18. The locking device 50 is more clearly shown in FIG. The lock housing 12 accommodates two sets of link plates including a front link plate 19 and a rear link plate 22 fixed to two sets of rotating shafts, respectively. Two sets of bolts are connected to the link plate. The front bolt 15 is connected to the front link plate 19 and extends between the front fixing points 32 of the first side rail 30 and the second side rail 40. The rear bolt 14 is connected to the rear link plate 22 and extends between corresponding rear fixing points 34 of the first side rail 30 and the second side rail 40. The two sets of link plates 19 and 22 are connected to each other by positioning bolts 13 connected to the handle 18. When the handle 18 is pulled outward from the lock housing 12, the positioning bolt 13 is pulled toward the front of the seat 11, and then the positioning bolt 13 pulls the two sets of link plates 19 and 22 forward. By the operation of the link plates 19 and 22, the front bolt 15 and the rear bolt 14 are retracted from the fixing points 32 and 34. In this adjusted position, the seat 11 (along with the backrest 10) can move freely along the side rail. When the desired seat height is obtained, the handle 18 is pushed back to return the positioning bolt 13 and thus the link plates 19, 22 to their original positions. By the operation of the link plates 19 and 22, the front bolt 15 and the rear bolt 14 are pushed outward to engage with the front fixing point 32 and the rear fixing point 34 to lock the seat portion 11 in a predetermined position.

  4 and 5 show how the bolts 14 and 15 engage the fixing points 32 and 34. FIG. Bolts 14 and 15 taper at their ends to form a tapered portion 35 having a flat end 36. There is a lip where the tapered portion meets the maximum diameter thickness of the bolt. The fixing points 32, 34 are formed by tapered holes having a taper of the same angle as that of the tapered portion 35 of the bolt.

  The bolts 14 and 15 and the side rail 30 on which the fixing points are arranged engage within the seat guide clamp 37. The seat guide clamp 37 includes a hole 38 through which the bolts 14, 15 can move and a slot 39 that allows the seat guide clamp 37 to move along the side rail 30. The seat guide clamp 37 can form a part of the runner 17.

  After the seat portion 11 has moved to an appropriate position, the bolts 14 and 15 move in the hole 38 from the position shown in FIG. 4 to the position shown in FIG. 5, and at the position shown in FIG. Not only does the tapered portion 35 engage the tapered holes 32, 34 so that the two tapered surfaces fit together, but the flat end 36 of the bolt pushes against the opposing surface of the slot 39. This effectively locks the entire structure, not only preventing the seat from moving up and down, but also preventing the seat from twisting. With this configuration, great rigidity can be obtained in the structure of the chair.

As will be appreciated by those skilled in the art, instead of the handle, link plate, and positioning bolt configurations, the locking device may use various mechanisms that allow the bolt to enter and exit the fixed point.

  In this particular embodiment, the securing element takes the form of a hole and the locking device includes a cylindrical bolt that extends into the hole. However, the anchoring element can take any form as long as the seat can be maintained at an appropriate angle with respect to the floor. Suitable fastening elements are known to those skilled in the art. For example, the fixing element can take the form of a slot and the bolt of the locking device can have a square shape instead of a cylindrical shape. Furthermore, each fixing element of the present invention can be composed of any number of fixing points. For example, each fixing element can be constituted by a single fixing point, for example in the form of a wide slot inclined in a horizontal state so that the seat is angled with respect to the floor. Alternatively, each fixing element can be composed of three, four or more fixing points.

  As shown in this particular embodiment, the front of the seat 11 is lower than the rear and forms a slight angle with respect to the floor. This is accomplished by placing the rear fixation point 34 at a position slightly higher than the corresponding front fixation point 32. As will be appreciated by those skilled in the art, depending on the desired angle magnitude of the seat 11 with respect to the floor, the arrangement of the front and rear fixation points can be varied. Or it is also possible to arrange | position the seat part 11 so that the rear part of the seat part 11 is lower than the front part. This can be accomplished by placing the rear fixation point 34 at a position slightly lower than the corresponding front fixation point 32.

  When in the folded state, the seat 11 can be detached from the securing element 31 by pulling on the handle 18 and orienting the seat in a position such that the seat is substantially flat with the backrest 10.

  A second exemplary embodiment of a chair 200 is shown in FIGS. 8-12, which includes a backrest 210, a seat portion 211, and a frame carrying the seat portion 211 and the backrest 210. Many of the features of the second embodiment are the same as the first embodiment, and, of course, these features are described in more detail in relation to the first embodiment than in the second embodiment. However, the same applies to the second embodiment.

  The frame includes a first side rail 230, a second side rail 240, and a pair of legs 250 and 260 that are rotatably connected to the first side rail 230 and the second side rail 240, respectively. Including. The rotary couplers 232, 242 between the legs and the side rails allow the chair 200 to be folded, as shown in FIG. It is separated from the end of (230, 240). Side rails 230, 240 are convexly curved and include channels along most of their length.

  Link plates 252 and 262 are attached to the respective leg portions 250 and 260. The rear support plates 270 and 280 are provided on both sides of the seat portion 211. Each rear support plate 270, 280 has a passage 272, 282, respectively, along most of its entire length. The link plates 252 and 262 are slidable along the passages 272 and 282, respectively.

  When the chair legs (250, 260) are fully open, the link plates 252 and 262 are in the uppermost position within the passages 272 and 282. As the legs 250, 260 move toward the closed position against the side rails 230, 240, the link plates 252 and 262 slide downward along the passages 272 and 282 so that the chair is sufficiently flat. The seat portion 211 is inclined so as to take the configuration (FIG. 12).

  When the chair is opened, the length of the passages 272, 282 defines the maximum angle between the legs 250, 260 and the side rails 230, 240. When the link plates 270 and 280 reach the uppermost ends of the passages 272 and 282, the leg portions 250 and 260 cannot move further in the direction away from the side rails 230 and 240. On the other hand, when the chair 200 is in an open state, the legs 250 and 260 are separated from the side rail 230 by the weight of the person sitting in the chair and the distance between the leg and the side rail. , 240 cannot fall inward (ie, fold the chair). In other embodiments, a locking device can be incorporated to ensure that the chair is not folded unexpectedly.

  The side rails 230, 240 on both side frames are connected by two support rods 207, and the legs 250, 260 are connected by a base rod 208 so as to form a frame that supports the seat 211 and the backrest 210. ing. When assembled and open, the frame becomes a rigid structure.

  The seat 211 is connected to the backrest 210 by two runners 217, one on each side of the chair, to form a seat assembly. The runner 217 is configured to move along the first side rail 230 and the second side rail 240 in the channel. As the runner 217 moves along the first and second side rails, the backrest 210 and seat 211 move accordingly. As described in the previous embodiment, because of the curved shape of the side rails 230 and 240, when the height of the seat portion 211 changes, the horizontal position of the backrest 210 with respect to the seat portion 211 changes. In this embodiment, the horizontal position of the backrest 210 relative to the seat portion 211 is further moved. The backrest 210 is connected to the runner 217 via a pair of cam arms 220 on each side of the backrest 210. The cam arm 220 is rotatably attached to both the runner 217 (position 221) and the backrest 210 (position 222). The cam arm 220 includes a connection point 221 at a position where it is connected to the runner 217. The cam arm also includes a cam follower 223, and when the cam follower is twisted, the cam arm 220 moves angularly to reposition the backrest 210. Each side rail 230, 240 has a cam guide slot 224. The cam follower 223 can move along the cam guide slot 224. As shown in FIG. 11, the bottom end of the cam guide slot 224 is shaped so that the cam arm faces the rear lower side. As shown in FIG. 10, the upper portion of the cam guide slot is formed so that the cam arm 220 faces substantially rearward and upward. Due to the movement of the cam follower 223 along the cam guide slot 224, the cam arm 220 rotates around the rotation shaft 221. The rotational movement between the cam arm 220 and the runner 217 changes the direction of the cam arm 220. This in turn causes the backrest 210 to retract or advance relative to the seat 211 and change its height. The backrest 210 is free to rotate about the axis of rotation 222, but usually assumes a substantially vertical position because the axis of rotation is above the center of mass.

  The seat portion 211 is configured to be substantially horizontal, but does not have to be parallel to the floor. The features that allow the seat 211 to be held in a substantially horizontal state while allowing height adjustment are similar to those described in the first embodiment. However, instead of having both front and rear fixation points on the side rails, only the front fixation points 232 are located on the side rails 230, 240, as shown in FIG. 9, and the rear fixation points 234 are rear support It is arranged on the plate 270. Nevertheless, as in the previous embodiment, the front anchor point 232 and the rear anchor point 234 jointly define the range of height of the seat 211, and each pair of anchor points 232, 234 is A specific height of the seat 211 is defined. The two fixed points of each pair are either horizontally aligned so that the seats are positioned horizontally, i.e., at a similar height, or tilted slightly forward or backward. As in the previous embodiment, the front portion of the seat portion 211 is lower than the rear portion so as to form a slight angle with respect to the floor.

  The locking device 250 on the back of the chair 200 is substantially the same as the locking device 50 of the previous embodiment and will not be described again here.

  In this particular embodiment, there is a link plate 252, 262 that is slidable along the passages 272, 282 of the rear support plates 270, 280, so the seat 211 can be folded to secure the fixing points 232, 234. No need to disconnect from

  The chairs 100, 200 can be made of any suitable material such as wood, plastic, and aluminum. Furthermore, the various components of the chair can be made of the same material, facilitating manufacture. Alternatively, the various components can be made of different materials. For example, the frame components (eg, side rails, upright supports, base supports, legs, and rear support plates) can be made of one material such as steel, and the seat and back can be made of plastic material Or can be upholstered for comfort. In a preferred embodiment, the chair is made entirely of plastic so as to be light weight, inexpensive and easy to manufacture to allow mass production.

Claims (47)

A seat,
Backrest,
A frame having curved rails;
A runner movable along the rail;
A chair including
The seat and the backrest are carried by the runner so that the seat and the backrest can move together along the rail, and the position of the backrest relative to the seat is such that the seat and the backrest are A chair that moves along the rail and changes horizontally.   The seat portion and the backrest are moved above the rail, whereby the height of the seat portion is increased, and the position of the backrest is moved backward with respect to the seat portion to change backward. The listed chair.   The chair according to claim 1 or 2, wherein the rail is a pair of convex side rails.   The chair according to any one of claims 1 to 3, wherein the backrest is movable along a passage defined in the rail.   The chair according to claim 4, wherein the passage is shaped such that the bottom of the passage is disposed toward the front of the chair and the top of the passage is disposed toward the rear of the chair.   The chair according to claim 4 or 5, wherein the backrest is rotatably attached to a connecting means, and the connecting means is movable along the passage of the rail.   The said connection means is a chair of Claim 6 which moves angularly so that the position of the said backrest with respect to the said seat part may be changed to a horizontal direction while the said seat part and the said backrest move along the said rail.   The chair according to claim 7, wherein the passage is shaped such that the connecting means moves along the rail and the connecting means moves angularly.   9. A chair according to any one of the preceding claims, wherein the frame includes a set of fixing elements that define a range of heights to which the seat can be fixed.   The locking device of claim 9, further comprising a locking device, wherein the locking device engages the set of securing elements to lock the seat in any one of a plurality of positions along the rail. Chair.   11. A chair according to claim 10, wherein the locking device includes a tapered bolt and the securing element includes a tapered hole into which the bolt fits.   The chair according to claim 10 or 11, wherein the locking device includes a locking body that houses the locking device and the fixing element at a position where they engage.   The frame further includes a pair of legs such that each leg can transition between an open state and a folded state through a rotational movement between the legs and the side rails. The chair according to any one of claims 3 to 10, which is rotatably connected to one side rail.   The chair according to claim 10, wherein the chair is transferred to a position where the seat is substantially flat with respect to the backrest by transferring the chair to the folded state.   11. A chair according to any one of claims 3 to 10, further comprising an upright support and a base support configured such that each side rail is coupled to both the upright support and the base support.   16. A chair according to claim 15, wherein each side rail and the upright support and base support coupled thereto form a generally triangular shape when the chair is in an open state.   The upright support includes a passage, and the base support includes a guide movable along the passage so that the chair folds into the open state through movement of the guide along the passage. 17. A chair as claimed in claim 15 or 16, capable of transitioning between states. A seat,
A frame having a pair of side rails with the seat supported therebetween, and a series of securing elements defining a range of height of the seat on both sides of the frame;
Attached to the seat and configured to engage the securing element to lock the seat at any one of a plurality of heights corresponding to the position of the securing element on either side of the frame. Locking device,
Including chairs.   The chair of claim 18, wherein each securing element includes a securing point.   20. A chair according to claim 19, wherein the bolt is tapered and the securing element includes a tapered hole into which the bolt fits.   21. A chair as claimed in any one of claims 18 to 20, wherein the locking device includes a locking body that houses the locking device and the securing element in a position where they engage.   The locking device includes a handle and a set of bolts extending between a fixed point on the first side rail and a corresponding fixed point on the second side rail, the handle including the bolt 20. A chair as claimed in claim 19, which enables to extend into or retract from the fixed point.   The chair according to claim 22, wherein the bolt is connected to the handle via a link plate.   The frame includes a pair of legs, each leg allowing the chair to transition between an open state and a folded state through rotational movement between the legs and the side rails. The chair according to any one of claims 18 to 23, which is rotatably connected to the side rail.   25. A chair according to any one of claims 18 to 24, wherein the fixing element and the locking device are configured to fix an angle of the seat relative to the floor.   26. A chair according to claim 25, wherein each fixing element includes a pair of fixing points aligned horizontally to fix the seat at a predetermined angle with respect to the floor.   The chair according to any one of claims 18 to 26, wherein the fixing element is provided on the side rail.   28. A chair according to claim 27, wherein one of the pair of fixed points is disposed on the side rail and the other is disposed on a support attached to the leg.   29. A chair according to any one of claims 18 to 28, further comprising a backrest.   30. The chair of claim 29, further comprising a runner that couples the seat to the backrest and is movable along the side rail.   31. A chair according to claim 30, wherein the horizontal position of the backrest relative to the seat changes as the height of the seat is adjusted.   The chair according to any one of claims 18 to 31, wherein the first and second side rails are curved. A seat,
A frame that supports the seat and includes a side rail and a leg carried on the side rail;
A foldable chair including
Between the unfolded and open state of the legs and the folded state where the legs are moved to the retracted position and the seat is moved to be substantially flat with the rest. Foldable chair that can be switched.   The foldable chair according to claim 33, further comprising a backrest, wherein the seat moves so as to be substantially flat with respect to the backrest when transitioned to a folded state.   The chair according to claim 33 or 34, wherein the side rail and the leg portion constitute a side frame, and the frame includes two side frames with the seat portion and the backrest supported therebetween.   36. A chair as claimed in any one of claims 33 to 35, wherein the height of the seat is adjustable.   37. A chair according to claim 36, wherein the frame includes a series of anchoring elements that define a range of the seat height on opposite sides of the frame.   Attached to the seat and configured to engage the securing element to lock the seat at any one of a plurality of heights corresponding to the position of the securing element on either side of the frame. The chair of claim 34, further comprising a locking device.   The chair according to any one of claims 34 to 38, wherein the frame further includes a seat support member connected to the seat and the leg.   40. A chair as claimed in claim 39, wherein the legs are movable along a passage defined in the seat support member.   39. A chair as claimed in claim 37 or 38, wherein each fastening element comprises a fastening point. The chair according to any one of claims 37 to 41, wherein the fixing element is arranged on the support means.   43. A chair as claimed in any one of claims 37 to 42, wherein each securing element includes a pair of securing points aligned horizontally to secure the seat at a predetermined angle relative to the floor.   44. The chair according to claim 43, wherein one of the fixed point pairs is disposed on the seat support member. Backrest,
A seat,
A frame having a pair of side rails supported between the seat and the backrest;
A chair including
The backrest is rotatably attached to the frame by a backrest support member, the backrest support member being able to move along the side rail so that the position of the backrest relative to the seat is changed horizontally. Composed of a chair.   46. The backrest support member according to claim 45, wherein the backrest support member is angularly movable so as to move angularly as the position of the seat changes and to change a position of the backrest relative to the seat in a horizontal direction. Chair.   The side rail includes a passage, and the backrest support member can move along the passage. The passage includes an angular movement of the backrest support member as the backrest support member moves along the rail. 47. A chair according to claim 45 or 46, wherein the chair is shaped for movement.

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