NO20111259A1 - Adjustable chair arrangement - Google Patents

Abstract

Device with adjustable chair (1), wherein the chair (1) is adjustable between at least a first position (A) and a second position (B), and wherein the chair (1) comprises: - a frame (3) arranged on a substrate (2); - a backrest (11) rotatably coupled to the frame (3) in a first pivot point (31); - a footrest (13) rotatably connected to the frame (3) at a second pivot point (33); and - a seat (15) connected to the backrest (11) and to the footrest (13), the seat (15) being displaceable relative to the frame (3) between at least a first seat position and a second seat position corresponding to the chair (1), respectively. ) first position (A) and second position (B), and wherein the backrest (11) and the footrest (13), when the seat (15) is displaced between said first and second seat position, are adjusted between a corresponding first and second backrest and footrest, respectively. st in 11 ing, characterized in that the chair (1) further comprises at least one resistance device (41, 43, 45, 45 ') arranged to counteract the adjustment of the chair (1) from at least one of said first position (A) and second position (B).

Description

ADJUSTABLE CHAIR DEVICE

The invention relates to a device for an adjustable chair. More specifically, the invention relates to a chair which can be adjusted between at least a first, upright position and a second, reclining position by a backrest and a footrest being rotatably connected to a frame, while a chair seat is suspended in the backrest and in the footrest. The adjustable chair further comprises at least one resistance device designed to counteract adjustment of the chair from at least one of said first and second positions

The present invention relates to a device for chairs intended to be used in, for example, cinema, concert, theater and auditorium halls, on the deck of a ship, on board an airplane or the like. The chairs can also be used, among other things, as garden chairs, children's chairs, wheelchairs, office chairs or as comfort chairs. The device will also be able to be used in prams and hospital beds. Said chairs can be fixed to a base, or they can be free-standing, either directly or on wheels, on the base. An adjustable chair according to the invention will be comfortable to use while at the same time meeting any requirement for a free escape route in the event of an emergency, for example when it is fixed in a row of chairs together with other chairs according to the invention in one of the above-mentioned utility rooms . In what follows, the invention will be exemplified with a chair intended for use in a cinema hall or the like, although the invention is not limited thereto.

Adjustable chairs that imitate the functionality of the human body in the form of placement of rotatable joints to increase a user's comfort are known. There are also known self-balancing chairs which can be rotated about the chair's center of mass, so that a user experiences an almost weightless state in the chair.

A self-balancing chair is described in patent document WO 92/03950. The chair stands on or is attached to a surface using a base. A backrest and a footrest are rotatably connected to an armrest, while the seat section itself is not attached to the armrest, but suspended from the backrest and footrest. The seat, backrest, footrest and armrest are connected in four pivot points which together form a parallelogram. The entire parallelogram frame is also rotatably connected to the base in a fifth pivot point on the armrest. In terms of its construction, the chair's center of mass balances around the pivot points. At the same time, the chair's human-body-like functionality means that the user's center of mass does not move relative to the chair's center of mass when the user sits or lies in the chair. Another "zero gravity chair" is described in patent document US 7311359.

It is also known to equip a chair with one or more spring devices to counteract or assist rotation about one or more pivot points. Furthermore, chairs are known which are provided with one or more spring devices designed to be able to retract a footrest and/or straighten a backrest when the user leaves the chair.

Bruksmönterpublication DE 202007008981 describes an armchair where a frame is placed on a base. A backrest, a footrest and an armrest part are attached to the frame. The backrest and footrest are rotatably attached to the frame and to each other. Furthermore, the backrest is connected to the frame with a spring of mechanical or pneumatic type, where the spring is arranged to be able to straighten the backrest and retract the footrest when the user leaves the chair.

Common to the known solutions, some of which are mentioned above, is that they have one or more of the disadvantages mentioned below.

Self-balancing chairs, which are not equipped with one or more devices that provide resistance to the adjustment of the chair, can be difficult to control in use. Since the chair balances around a center of mass, small, often unintentional, movements and positional changes by the user can lead to major changes in the chair's position. Such chairs are also often intended to bring the feet into a higher position than the head, which would not be appropriate in a cinema hall or similar where you want a clear view ahead. Armchairs that also include footrests (and leg rests) are usually not used in cinemas or the like for safety reasons. In an emergency situation, back and footrests in an extended position could be an obstacle to free escape routes. For that reason, according to known technology, an armchair would have to occupy a very large space in a cinema hall or the like in order to satisfy the requirement for safety, and thus not be appropriate for economic reasons. Known solutions with self-righting back and footrests often require manual activation of a lever, a button or the like to lower or straighten the chair. The adjustment often requires electrical or pneumatic power supply for operation of an actuator or the like, which does not satisfy safety requirements, as in an emergency it will not be sufficient to base the chair's adjustment on said activation mechanisms. In a cinema hall, it is also important, for aesthetic reasons, that all chairs are in one and the same position when the audience enters the hall before a performance starts. Known technology thus does not provide satisfactory solutions for cinema chairs with footrests which function without added electrical or pneumatic power and which satisfy requirements for safe function and aesthetics. There are also no known resistance devices designed to hold a chair in at least one of its extreme positions until a force is provided which is large enough to adjust the chair out of one of said extreme positions. The purpose of the invention is to remedy or to reduce at least one of the disadvantages of known technology, or at least to provide a useful alternative to known technology.

The purpose is achieved by features that are stated in the description below and in subsequent patent claims.

In the following, foot support means a device designed to be able to relieve the feet and/or calves.

In the following, connected to means attached directly to or attached to by means of one or more connecting elements such as, for example, a hinge, a fitting, a bracket or the like. Said connecting element can be rigid or elastic.

In a first aspect, the invention relates to a device for an adjustable chair, where the chair is adjustable between at least a first position and a second position, and where the chair comprises: - a frame placed on a base; - a backrest rotatably connected to the frame in a first pivot point;

- a footrest rotatably connected to the frame at a second pivot point; and

- a seat connected to the backrest and to the footrest, where the seat is displaceable relative to the frame between at least a first seat position and a second seat position corresponding to the first and second positions of the chair respectively, and where the backrest and the footrest, when the seat is displaced between said first and second seat position, adjusted between a corresponding first and second respectively backrest and footrest position, characterized in that the chair further comprises at least one resistance device designed to counteract the adjustment of the chair from at least one of said first position and second position.

The chair's first position can be an upright position where the backrest is upright and the footrest is folded in. The chair's second position can be a reclined position where the backrest is tilted backwards and the footrest is folded out. Between the two aforementioned first and second positions, the chair can preferably be infinitely adjustable by means of weight distribution. The chair's frame may include or be connected to an armrest. In a case where the chair is intended to be used in a continuous row of chairs together with other chairs according to the invention, the frame can include middle rails, which are common to two chairs in the row of chairs, and end rails at each end of the row of chairs.

In a preferred embodiment, the pivot points can be fixed. This means that the pivot points cannot be moved with or in relation to the frame. Rotary couplings are more mechanically robust in use than couplings that include linear movements, and the chair's construction is thus more robust. This will be a great advantage for chairs intended for mass use, such as in a cinema hall, as it will be able to increase the life of the chair considerably.

It can be an advantage if the resistance device comprises at least one of the parts resistance element and holding mechanism. The resistance element can for example be different types of mechanical or pneumatic springs which provide resistance to the adjustment throughout all or part of the adjustment between the chair's first and second position. In some embodiments, a resistance element can also, in addition to providing resistance, provide a thrust force that acts in the direction of adjustment in a part of the adjustment area. The holding mechanism can be a device that provides a holding force that counteracts adjustment of the chair, where the holding force essentially works when the chair is in the first and or second position.

In a first embodiment, the at least one resistance device may comprise a resistance element which is a pressure spring. The compression spring can, for example, be of mechanical or pneumatic type. A pressure spring can be used to press against at least a part of the chair, so that the chair is pressed into at least one of the first and second positions. The spring thus works against a force which tries to adjust the chair away from the first and or second position, at least now that the chair is essentially close to the first and or the second position. This will be particularly appropriate for a chair that moves around a center of mass, where small movements by a user can have large, often unwanted, effects on the chair's position.

In a preferred embodiment, the compression spring can be connected between the seat and the frame, preferably in such a way that the compression spring is rotatable about the attachment point on the frame. The thick spring will thus be able to push the seat towards the first seat position when the seat is essentially close to the first seat position, and towards the second seat position when the seat is essentially close to the second seat position. This will have the advantage that one and the same spring can be used to push the seat both towards the first and the second seat position, so that one and the same compression spring also counteracts adjustment of the chair both from the first position and from the second position. The compression spring will also have the advantage that no release mechanism, such as for example a lever, a button or the like, is necessary to adjust the chair from one position to another. This will be beneficial both in terms of ease of use, reduced mechanical complexity, increased robustness and improved aesthetics. By pushing off an armrest or similar, so that the seat moves forwards and or by placing weight against the backrest, the chair will be able to be adjusted from the first position to the second position. By pulling on the same armrest or similar and or by putting your body weight forward, the chair will be able to be adjusted from the second position to the first position.

In another embodiment, the at least one resistance device may comprise a holding mechanism arranged to hold the chair in at least one of first and second positions with a predetermined force, so that a release force greater than said holding force must be provided to adjust the chair away from the first and or other position. This could also be important for aesthetic reasons if the chair is used in a cinema hall or similar, as it is important that all chairs are in the same position when the audience enters the hall. The holding mechanism will also be advantageous, as mentioned above, as small movements by a user will not lead to inadvertent adjustments of the chair's position, both from a first, for example upright, position and from a second, for example reclining, position. The holding mechanism can be used instead of or in addition to said resistance element.

It can be advantageous if the holding mechanism provides a greater holding force in the chair's first position than in the chair's second position. This could have the advantage that a smaller force, for example a force which is only slightly greater than the force from the weight of the footrest, is required to straighten the chair, while a slightly larger force is required to adjust the chair away from an upright position. In an alternative embodiment, the holding mechanism can be released in one or both of the chair's first and second positions by means of a release mechanism. The trigger mechanism, which can be of a known type, can for example be activated using a button, a lever or the like. A trigger mechanism could be particularly appropriate when using a chair according to the invention in a utility room or in a place where previously mentioned safety requirements do not apply.

In one embodiment, the backrest can be rotatably connected to the frame in a first pivot point, and the footrest can be rotatably connected to the frame in a second pivot point, where the second pivot point is located at a distance from the first pivot point on the frame. Furthermore, the seat can be connected to the backrest in a first displacement point and to the footrest in a second displacement point, where the second displacement point is located at a distance from the first displacement point on the seat. This will have the advantage that the seat can "float" freely without being attached to the frame and that the backrest and footrest rotate when the seat is moved. The backrest and or footrest may, but need not, be non-rotatably connected to the seat at their respective displacement points. In an alternative embodiment, the seat can be connected to a rail which is guided through a set of wheels, roller bolts or the like on the frame for displacing the seat. The seat will therefore not float freely, but is guided linearly with the help of the rail and the wheels. Alternatively, said wheels, roller bolts or similar can be connected to the seat, while the rail is connected to the frame.

In a preferred embodiment, the distance between the first pivot point and the first displacement point can be greater than the distance between the second pivot point and the second displacement point. This will have the effect that the footrest, which is connected to the frame at the second pivot point and to the seat at the second displacement point, when the seat is displaced, is rotated a greater angle about the second pivot point than the backrest is rotated, in the opposite angular direction, about the first pivot point . This will be important with regard to a user's comfort as a more relaxing and appropriate position will be possible in a reclining chair position.

In one embodiment, the at least one resistance device may comprise an elastic resistance element designed to be able to pull the backrest and the footrest towards the first backrest and footrest positions, respectively. The elastic resistance element will thus work against the adjustment of the chair from the first to the second position, while the elastic resistance element works with the adjustment of the chair from the second to the first position. This could be important in terms of user comfort, as a user can be helped into an upright position after a performance or similar. It could also be important for safety reasons as the chair is automatically straightened when a person leaves it. The elastic resistance element can, for example, be a spring of mechanical or pneumatic type.

In a preferred embodiment, the elastic resistance element can be connected between the backrest and the seat. In alternative embodiments, the elastic resistance element can be connected between at least two of the parts backrest, seat, frame, footrest, armrests and base. Dimensioning of the resistance element is done on the basis of the weight of the individual movable chair components.

In what follows, a non-limiting example of a preferred embodiment is described which is illustrated in the accompanying drawings, where:

Fig. 1 shows, seen from the side, a sketch of an adjustable chair according to the invention in a first position; Fig. 2 shows, seen from the side, a sketch of the same chair as in fig. 1 in a second position; Fig. 3 shows, seen in perspective, a simplified sketch of the same chair as in fig. 1 in the first position; Fig. 4 shows, viewed from the side, a sketch of an adjustable chair, where the chair is shown in both the first and the second position, and where the rotation radii of the backrest and footrest about their respective pivot points are indicated; Fig. 5 shows, seen from the side, a sketch of an adjustable chair according to the invention in the first position; Fig.6 shows, seen from the side, a sketch of the same chair as in fig. 5 in the second position; Fig. 7 shows, seen from the side, a sketch of a chair according to the invention in the first position; Fig. 8 shows an enlarged section of a part of the chair from Fig. 7; Fig. 9 shows, seen from the side, a sketch of the same chair as in fig. 7 in the second position; Fig. 10 shows an enlarged section of a part of the chair from Fig. 9; Fig. 11 shows a chair according to the invention in the first position; Fig. 12 shows in perspective and on a smaller scale a row of chairs made up of chairs according to the invention; Fig. 13 shows, seen from the side, a simplified sketch of an adjustable chair according to the invention in the first position, where a person sits in the chair; Fig. 14 shows, seen from the side, a simplified sketch of the same chair as in Fig. 13 in the second position, where a person lies in the chair; Fig. 15 shows, seen from the side, a simplified sketch of an adjustable chair according to the invention in the first position; Fig. 16 shows, seen from the side, a simplified sketch of the same chair as in figure 15 therein

second position;

Fig. 17 shows in perspective a sketch of the same chair as in figure 15 in the first

the position; and

Fig. 18 shows in perspective a sketch of the same chair as in figure 15 in the second

the position.

In the following, the reference numeral 1 denotes an adjustable chair according to the invention, where the chair 1 is placed on a base 2. The adjustable chair 1 comprises frame 3, where the frame 3 is designed with a T-shaped side rail 35. The side rail 35 stands on the base 2 supported by a plinth 37, where the plinth 37 is designed with bores 371 for attaching the frame 3 to the substrate 2 by means of so far known technology (not shown). A backrest 11 is rotatably connected to the frame 3 in that a backrest bracket 115, attached to the side of the backrest 11, is attached to the side wall 35, in a manner known to the extent known, in a first pivot point 31. A footrest 13 is similarly connected to the frame 3 in a second pivot point 33 in that a footrest bracket 135, attached to one side of the footrest 13, is attached to the side rail 35. The seat 15 is not connected directly to the frame 3, but is suspended in the backrest 11 and in the footrest 13 in that a seat bracket 155 , which is attached to the seat 15, is attached to the back support bracket 115 of the backrest 11 and to the foot support bracket 135 of the footrest 13 in a first displacement point 151 and a second displacement point 153, respectively. A stop 157 on the seat bracket 155 prevents the footrest 13 from being folded back further than to its first folded position, and thus that the backrest 11 cannot be leaned forward and that the seat 15 cannot be moved further back than to the first seat position. The adjustable chair 1 shown is intended to be put together with several chairs 1 according to the invention for a row of chairs in a cinema or similar. The side wall 35, which is only shown on one side of the chair 1, will be common to two chairs 1 in the row of chairs and thus function as an intermediate wall. The symmetry of the chair 1 is therefore shown such that the side rail 35 and the fittings 115, 135, 155 with associated mechanics for adjusting the chair 1 are only attached to one side of the chair 1, even though the chair 1 in use will be provided with frame 3, fittings 115, 135, 155 and said mechanics on both sides. The various figures show the frame 3, fittings 115, 135, 155 and the mentioned mechanics on the right or left side of the chair 1.

Figure 1 shows the adjustable chair 1 in a first, upright position A. The seat 15 is in the first seat position, corresponding to the first position A of the chair 1, while the backrest 11 and the footrest 13 are correspondingly in a first, respectively, backrest and footrest position . A person 5, see figures 13 and 14, who is sitting in the chair 1 will, by pushing on an armrest 39, which is attached to the frame 3, with a sufficiently large pushing force and or putting his body weight against the backrest 11, move the seat 15 forwards relative to the frame 3 in the chair's use position. The displacement of the seat 15 means that the backrest bracket 115, since it is attached to the seat bracket 155 of the seat 15 in the first displacement point 151, and thus the entire backrest 11, is rotated about the first pivot point 31 on the frame 3, so that the backrest 11 is rotated towards a second, leaning back score. Since the seat bracket 155 is also attached to the foot support bracket 135 in the second displacement point 153, the foot support bracket 13 will rotate about the second pivot point 33 on the frame 3 towards a second, advanced foot support position. The axes of rotation belonging to the pivot points 31, 33 are normally on the paper plane. The displacement distance for the first 151 and the second displacement point 153 in the displacement direction of the seat 15 is the same. The respective pivot angles of the backrest 11 and the footrest 13 about the first 31 and the second pivot point 33 on the frame 3 will thus depend on the distance between the pivot point 31, 33 and the associated displacement point 151, 153 as explained in more detail below. The chair 1 is thus adjusted, by moving the seat 15 forwards, from the first, upright position A towards a second, reclining position B, as shown in figure 2.

Figures 1, 2, and 4 show the adjustable chair 1 comprising a resistance device in the form of a pneumatic pressure spring 41 connected between the frame 3 on the side wall 35 of the frame and the seat 15 seat fitting 155. The pressure spring 41 is rotatably attached to the frame 3 at a pivot point 36 and to an attachment point 156 on the seat fitting 155 of the seat 15. When the chair 1 is in the first, upright position A, or is essentially close to the first, upright position A, the pressure spring 41 will cause the seat 15 to be pushed backwards towards the first seat position and that the chair is thus held in or pressed against the first, upright position A with a force from the pressure spring 41. The person 5 sitting in the chair 1 will have to provide a pushing force to the seat 15, for example by pushing from the armrest 39 and thus pushing the backrest 11 backwards, in the direction of displacement of the seat 15, which is greater and oppositely directed than the component of the compressive force of the pressure spring 41 which acts against the displacement of the seat 15 to adjust the chair 1 away from the first position A. When the seat 15, after having been supplied with a sufficiently large pushing force, is displaced away from the first position A, the compression spring 41 will rotate about the attachment point 36 on the frame 3. The force component of the compression spring 41 which acts backwards against the displacement of the seat 15 towards the first the seat position will decrease by displacing the seat from the first seat position until the pressure spring 41 is normally in the direction of displacement of the seat 15, so that said force component becomes zero. Upon further displacement of the seat in the same direction, the force component of the pressure spring 41 in the direction of displacement of the seat 15 will act forwards, so that the pressure spring 41 causes the seat 15 to be displaced towards the second seat position, and that the chair 1 is thus adjusted towards the second, reclining position B. On a corresponding way, the chair, with the help of a pushing force from said user, can be adjusted from the second position B to the first position A where the pressure spring 41 works against the adjustment when the chair 1 is essentially close to the second position B, while the pressure spring 41 works with the adjustment when the chair is essentially close to the first position A, so that the pressure spring 41 presses the chair 1 towards the first position A.

Figure 3 shows a simplified perspective sketch of the chair 1 from Figures 1 and 2, without the armrest 39 and the compression spring 41 for the sake of clarity.

In figure 4, a distance R between the first pivot point 31 and the first offset point 151 and a distance r between the second pivot point 33 and the second offset point 153 are shown as the radii of two different circles with their centers in the first 31 and the second pivot point 33 respectively A displacement of the seat 15 will entail a displacement of the first 151 and the second pivot point 153 along the circumference of their respective circles. Since the distance R is greater than the distance r, a corresponding displacement of both displacement points 151, 153 will correspond to a greater angle of rotation around the second pivot point 33 than around the first pivot point 31. This will cause the angular displacement of the footrest 13, during displacement of the seat 15, will be greater than the angular projection of the backrest 11. Since the seat 15 is displaced along the circumference of the two circles mentioned, the position of the seat 15 will also change from the first to the second seat position. Figure 5 shows an alternative embodiment of the adjustable chair 1, where the chair 1 is shown without the armrest 39 for the sake of overview. The resistance device is shown here as an elastic resistance element 43 in the form of a mechanical tension spring 43 attached between the back support bracket 115 of the backrest 11 and the seat bracket 155 of the seat 15. When the chair 1 is not in use, the tension spring 43, together with the stop 157, causes the backrest 11 to stand in its first, upright position, that the seat 15 is in the first seat position and thus that the chair 1 is in the first, upright position A. The traction spring 43 constantly acts on the chair 1 with a traction force that tries to straighten the chair 1 in towards the first, upright position A of the chair 1 by pulling together the backrest 11 and the seat 15. The chair 1 is therefore automatically adjusted back to the first, upright position A when a person 5 leaves the chair 1. Figure 6 shows the chair 1 from Figure 5 in the second, reclined position B. The tension spring 43 is here in an extended position, but still within its elastic limit. Figure 7 shows an alternative embodiment of the adjustable chair 1, without the seat 15 for the sake of overview, where the resistance device is constituted by a holding mechanism 45. The holding mechanism comprises an arm 451 rotatably connected to the frame 3 at a pivot point 34. The arm 451 is connected to the frame 3 by using a tension spring 452 which is attached to the frame 3 in the lower tension spring part and to a protrusion 455 on the arm 451 in an upper tension spring part. Furthermore, the arm 451 is designed with a recess 454 between elevations 456. The back support bracket 115 of the backrest 11 is in this embodiment provided with a roller bolt 453 designed to be able to engage with the recess 454. When the chair 1 is in its first, upright position A, the roller bolt 453 engages with the recess 454 on the arm 451. The tension spring 452 causes the chair 1 to be pulled in towards the first position A, where the roller bolt 453 engages with the recess 454, and that several chairs 1 according to the invention, which are placed in the same place , will be able to stand in exactly the same position when these are not in use. A force, which is greater than a given holding force, will have to be provided to be able to adjust the chair 1 away from the first, upright position A. The holding force will depend, among other things, on the construction of the spring 452, the depth of the recess 454 and the turning resistance of the arm 451 at the pivot point 34. Figure 8 shows an enlarged section of the holding mechanism 45 at the upper part of the arm 451 near the pivot point 34, with the roller bolt 453 on the backrest 11 backrest bracket 115 in engagement with the recess 454 between the elevations 456 on the arm 451 when the chair is in the first, upright position A. Figure 9 shows the chair from Figure 7 in the second, reclining position B, also here without the seat 15 for the sake of clarity. The roller bolt 453 is outside the recess 454 on the outside of the elevation 456. The elevation 456 provides a holding force that is greater than the force from the weight of the footrest 13, so that the holding device 45 in the embodiment shown can also hold the chair 1 in the second, reclining position B. This can be appropriate both in terms of comfort and for demonstration purposes, as the chair 1 can be shown in a reclined position B without a person 5 having to sit in the chair 1. Figure 10 shows an enlarged section of the holding mechanism 45 at the upper part of the arm 451 near the pivot point 34, with the roller bolt 453 on the backrest 11 backrest bracket 115 outside the recess 454 and on the outside of the elevation 456 on the arm 451 when the chair 1 is in the second, reclined position B. Figure 11 shows another alternative embodiment of the adjustable chair 1, without seat 15 for the sake of clarity. The embodiment is similar to that shown in figures 7 and 9, but a holding mechanism 45' is in this embodiment provided with a compression spring 457 instead of the tension spring 452, where the compression spring 457 is attached with a lower compression spring portion to the arm 451 in a fixing point 458 on the lower attachment point of the arm 451 part and to the frame 3 with an upper compression spring part. The holding mechanism 45' provides resistance to adjustment of the chair 1 from both the first, upright position A and from the second, reclined position

ling B.

Figure 12 shows several chairs 1 according to the invention put together, by means of techniques known so far, into a continuous row of chairs. The row of chairs comprises chairs 1 according to the invention connected by means of side rails 35, which are common to two chairs 1 in the row, as well as end rails 38 at each end of the row of chairs. Figure 13 shows a simplified sketch of an embodiment of the adjustable chair 1 in the first upright position A. A person 5 is shown sitting in the chair 1. The chair 1 is sketched without resistance device (41, 43, 45, 45') for the sake of overview . The frame 3 is provided with several wheels 32 placed at a distance from each other, between which a rail 152, attached to the seat 15 seat bracket 155, is guided by shifting the seat 15 between the first and the second seat position. The displacement direction of the seat 15 is thus linear in this embodiment. The seat 15 is connected to the backrest 11 by means of a roller bolt 154a on a modified seat fitting 155 which is guided in a long hole 112 on the back support fitting 115. Similarly, the seat 15 is connected to the footrest 13 by means of a roller bolt 154b on the modified seat fitting 155 guided in a long hole 132 on the foot support bracket 135. Figure 14 shows the adjustable chair 1 from figure 13 in the second, reclining position B. The rail 152 on the seat 15 seat bracket 155 is guided through the wheels 32 on the frame so that the seat 15 is shifted to the second seat position. The backrest 11 and the footrest 13 are correspondingly turned to their other respective backrest and footrest positions. The roller bolts 154a, 154b have been shifted in their respective long holes 112, 132 to compensate for the linear displacement of the seat 15. Figures 15, 16, 17 and 18 show a further embodiment of the adjustable chair 1. In the second, reclining position B, the backrest 11 can be placed further back and the footrest 13 raised higher than in the other embodiments shown, so that an even a more relaxing position will be possible. The frame 3 is shown with an alternative design, and the chair 1 is provided with a tension spring 43 connected between the frame 3 and the chair seat 15, where the tension spring 43 is arranged to straighten the back support 11 and retract the foot support 13 when a person 5 leaves chair 1.

Claims (16)

1. Device for an adjustable chair (1), where the chair (1) is adjustable between at least a first position (A) and a second position (B), and where the chair (1) comprises: - a frame (3) arranged on a substrate (2); - a backrest (11) rotatably connected to the frame (3) in a first pivot point (31); - a foot support (13) rotatably connected to the frame (3) in a second pivot point (33); and - a seat (15) connected to the backrest (11) and to the footrest (13), where the seat (15) is displaceable relative to the frame (3) between at least a first seat position and a second seat position corresponding respectively to the first position of the chair (A) and second position (B), and where the backrest (11) and footrest (13), when the seat (15) is moved between said first and second seat positions, are adjusted between a corresponding first and second respectively backrest and footrest path Iling , characterized in that the chair (1) further comprises at least one resistance device (41, 43, 45, 45') designed to counteract the adjustment of the chair (1) from at least one of said first position (A) and second position (B) . 2. Device according to claim 1, where the pivot points (31, 33) are fixed. 3. Device according to claim 1 or 2, where the smallest one resistance device (41, 43, 45, 45') comprises at least one of the parts resistance element (41, 43) and holding mechanism (45, 45'). 4. Device according to claim 3, where the at least one resistance device (41, 43, 45, 45') comprises a resistance element (41, 43) which is a compression spring (41). 5. Device according to claim 4, where the pressure spring (41) is connected between the seat (15) and the frame (3), and where the pressure spring (41) is rotatable about an attachment point (36) on the frame (3), as that the pressure spring (41) pushes the seat (15) towards the first seat position when the seat (15) is essentially close to the first seat position, and that the pressure spring (41) pushes the seat (15) towards the second seat position when the seat (15) is in it substantially close to the second seat position. 6. Device according to any one of the preceding claims, wherein the at least one resistance device (41, 43, 45, 45') comprises a holding mechanism (45, 45') adapted to hold the chair (1) in at least one of first position (A) and second position (B) with a predetermined force, so that a release force greater than said holding force must be provided to adjust the chair (1) away from at least one of said first (A) and second position ( B). 7. Device according to claim 6, where the holding mechanism (45, 45') provides a greater holding force in the first position (A) of the chair (1) than in the second position (B) of the chair (1). 8. Device according to any one of the preceding claims, where the back support (11) is rotatably connected to the frame (3) in a first pivot point (31), and the foot support (13) is rotatably connected to the frame (3) in a second pivot point (33), and where the second pivot point (33) is located at a distance from the first pivot point (31) on the frame (3). 9. Device according to any one of the preceding claims, wherein the seat (15) is connected to the backrest (11) in a first displacement point (151) and to the footrest (13) in a second displacement point (153), and where the second displacement point (153) is located at a distance from the first displacement point (151) on the seat (15). 10. Device according to claims 8 and 9, where the distance between the first pivot point (31) and the first displacement point (151) is greater than the distance between the second pivot point (33) and the second displacement point (153). 11. Device according to any one of the preceding claims, where the at least one resistance device (41, 43, 45, 45') comprises an elastic resistance element (43) arranged to be able to pull the backrest (11) and the footrest (13) towards the first backrest and footrest position respectively. 12. Device according to claim 11, where the elastic resistance element (43) connects the backrest (11) and the seat (15). 13. Device according to claim 11 or 12, where the elastic resistance element (43) is a mechanical element. 14. Device according to claim 11 or 12, where the elastic resistance element (43) is a pneumatic element. 15. Device according to claim 4, where the pressure spring (41) is a mechanical spring. 16. Device according to claim 4, where the compression spring (41) is a pneumatic spring.