JP2004518507A - Chairs, especially office chairs - Google Patents

Abstract

The present invention relates to a chair, in particular an office chair, having a seating part and a downwardly inclined guide path providing a combined downward and backward movement or a combined upward and forward movement for the sitting part. The seating part is therefore often elastically slid rearwardly and downwardly along a predetermined guiding path. In order to improve the ergonomics of such chairs, a rocking device with at least a horizontal rocking axis is provided for rockingly positioning the seating part, wherein the rocking device is The swinging device is disposed between the seating portion and the guide path, and the swing device is movably disposed along the guide path together with the seating portion. As a result, a combined movement of the seating parts can be generated, which movement is synthesized from the synergistic action of a predetermined guiding path and a rocking movement about the rocking axis of the rocking device.

Description

[0001]
The present invention relates to a chair, in particular an office chair, having a seating part and a downwardly inclined guide path providing a combined downward and backward movement or a combined upward and forward movement for the sitting part.
[0002]
Such a chair is known, for example, from DE-A-199 00 544. The front seating surface end of the seating element, here formed as a rigid seating shell, is arranged on a seating support, which is guided by the guide element in the upper end region of the leg portion. . The seating support therefore moves along the guide path at the guide element. Assuming a chair occupant, the rigid seating shell is moved downward and backward in a combined exercise when placed on the chair. This movement takes place against the spring action of a specially configured spring device. In this publication, a spring device is described, in which the spring force increase of the spring device decreases from a certain elasticity. The guide element is arranged to be inclined downward, and is configured to bend convexly in the direction of the seating surface. The movement therefore takes place substantially along a circular path. As a result, not only does the seating surface move downwards and backwards, but also the backrest follows this course of movement. By utilizing a resilient seating shell, an additional tilting of the backrest can also take place on account of the leverage forces acting here, which are greater.
[0003]
Another chair of the class is known from DE-A-433 1987. The seating element is pivotable backward and downward in an arc about a pivot axis substantially at the ankle of a person seated here. For this purpose, an arc-shaped guide element is used, which is mounted on a footrest. Since the seating support is slidably guided here, it can penetrate into the guide element in response to the rocking movement of the seating element against the force of the compression spring.
[0004]
However, in the prior art, chair structures are also known in which, in addition to the rocking or tilting movements of the seating surface, a transmitted tilting movement with a forced connection of the backrest is performed. From EP 0 645 976, for example, a four-link coupling transmission which produces such a movement is known. However, this chair configuration does not utilize a downwardly sloping guide path which offers better possibilities for a stable configuration.
[0005]
For example, the system of DE-A 433 1987 is disadvantageous in a chair according to the class, in that it is relatively high and a relatively large downward movement is performed during a small backward movement. . According to DE 199 00 454, a flatter configuration variant is already known. However, there is now a need for this improvement in the ergonomics of the chair.
[0006]
The object of the present invention is therefore to provide a chair as described at the outset, which enables an ergonomic and structurally simple construction.
[0007]
According to the present invention, this problem is solved as follows. That is, a swing device having at least a horizontal swing axis is provided to swingably arrange the seat portion, and the swing device is movably arranged along the guide path together with the seat portion. . Therefore, after the movement along the guide path, it is still additionally possible for the seating part to rock about the rocking axis of the rocking device. This can provide an additional motion component. The seating part can incline down much more quickly than it allows for a movement path from its shape alone. However, this arrangement also discloses another course of movement. The movement of the seating part therefore depends not only on the inclined movement path, but also on the possibility of rocking about the rocking axis of the rocking device. For this purpose, the rocking device provides a connection between the guide path and the seat.
[0008]
When moving or running the rocking device along the guide path, the main movements performed by the seating part are problematic, and the compensatory movements to avoid tightening and the like are not. Therefore, the maximum travel of the rocker along the guide path is preferably greater than 30 mm, preferably greater than 60 mm. In a special configuration, this is between 120 and 130 mm. The combined downward and rearward movements therefore lead to a perceptible running of the seating part.
[0009]
It can further be taken into account that the maximum rocking angle of the rocking device about the rocking axis is greater than 5 °, preferably greater than 10 °. In a particular embodiment this is between 12 ° and 15 °. This will make it clear that the exercise process that can be perceived by the chair user will be a problem. In particular in combination with the previously characterized driving course, an optimal combination of seating part movements can thereby be achieved.
[0010]
Because of the wear, the guide path can be configured as a sliding or rolling path, so that a strongly loaded office chair can also have a corresponding lifetime. The seating part can then move along this sliding or rolling path.
[0011]
In one embodiment, a coupling transmission can be provided, which forcibly couples the movement of the rocker along the guide path and the rocking movement about the rocking axis. The two courses of movement are therefore directly related to one another and cannot be performed individually. Thus, a given travel path section along the guidance path leads to a precisely defined swing angle around the swing axis. The motion parameters can be matched to each other for an optimal ergonomic configuration. Since coupling transmissions are themselves well known in the prior art, it is left to the expert to cause the desired course of movement by selecting appropriate parameters.
[0012]
Constructing the coupling gearing so as to perform a rocking movement about the rocking axis of the rocking device in order to assist the downward movement of the rear seating area in the downward and rearward movements of the seating part, if possible. Can be. Therefore, the seating part is inclined so that it moves backwards earlier than the pre-given direction of movement of the guide path, and therefore the flat guide path is also ergonomically desirable in co-operation with the rocking device. Lead to.
[0013]
This effect can be enhanced in accordance with the deformation, in particular, by virtue of the fact that the pivot axis of the pivot device is arranged in the area of the front seating part. With this measure, the rocking movement of the seating part around the rocking axis is particularly pronounced.
[0014]
The coupling transmission can include a coupling element, which can be pivoted about a base pivot position having a horizontal pivot axis spaced on the one hand with respect to the pivot axis of the pivot device. Arranged on the other hand and at a distance from the base rocking position, also at a rocking axis of the rocking device via a hinge connection having a horizontal rocking axis with the seating part. Is placed. The distance between the base rocking position with respect to the rocking axis of the rocking device and the distance between the base rocking position with respect to the hinge connection and the distance between the hinge connection with the rocking axis of the rocking device is adjusted according to the desired facts. be able to. The ergonomically desirable course of movement is prearranged, preferably by means of a connecting element. The concept connection element can be understood as an integral group of individual elements and components which support such a movement in accordance with the connection transmission. For good curve distribution, therefore, split symmetrical arrangements (on the left and right sides of the chair) which can be provided as connecting elements in the sense of the claims can also be considered.
[0015]
As desired, the guide path and the base rocking position for the coupling element can be arranged stationary with respect to each other. At this time, they can absorb as much as possible of the support forces in a fixedly defined position, while the rocking device and the hinge position move on a predetermined path.
[0016]
A configuration in which the connecting element is configured as a component of the backrest is particularly desirable. The backrest is thereby linked together to the entire exercise course. The transmission ratio between the inclination of the seat and the backrest can therefore also be realized together.
[0017]
At that time, the deformation occurs when the support surface of the backrest and the seating surface of the seating portion have an angle ratio of approximately 1.5: 1 to 2.5: 1, preferably approximately 2: 1, and the swing of the basic swing position is changed. Consider that the coupling transmission is configured to be forcibly coupled and tilted backwards about the axis of movement or backwards about the axis of swinging of the rocking apparatus moved along the guide path. . A transmission ratio of approximately 2: 1 is considered ergonomically particularly desirable. Especially in configurations where the swing angle of the seating surface is greater than 5 °, preferably greater than 10 °, the swing angle of the backrest is therefore at least 10 °, preferably 20 °. In the preferred embodiment, this is between 24 ° and 30 °.
[0018]
A configuration that is particularly simple to implement takes into account, for example, that the swinging device has a guide rail, which is guided movably along a fixed guide path. This is through all possible telescopic components or components which can travel relative to one another. Such arrangements can be configured very stably, so that they are also well suited for heavy people.
[0019]
In order to cause as much installation security as possible, the support of the rocking device in the guide path can take place approximately in the center of the installation surface. In this case, the installation surface can be understood as a plane extending through the contact point between the base and the chair. If the rocking device is to be arranged, for example, in the front area of the seating part, suitable devices must be provided, such as the aforementioned guide rails, which are then supported in the central area with respect to the mounting surface Have been. This leads to an optimized force introduction and a lower load in the guidance path.
[0020]
In addition, a spring device can be provided, in which at least a downward and rearward movement of the seating portion takes place against the spring action of this spring device. As a result, the seating part and, depending on the configuration, the backrest can be automatically returned to the initial position again after the load on the chair has been released. For seating comfort, countless influences can be exerted via the spring device. The spring device can be with any structure that can move against the return force. As spring devices, for example, tension or compression springs, torsion springs, elastomer springs, etc. can be used.
[0021]
A good integration of the spring device into the overall configuration exists, according to one variant, when the spring device has a working direction that extends substantially along the guide path. The spring device therefore acts exactly in the direction of travel, so that all its spring action is used and not just its components or proportions. If, according to one configuration, the guiding path is to be curved, it is possible to make as large an approximation as possible, as long as the spring action is not curved but also extends linearly (tangents, strings, etc.). ).
[0022]
Preferably the spring device comprises an adjusting unit for adjusting the spring action. As a result, the chair can be adjusted for all weight classes as much as possible and achieve optimal elastic properties. In all cases, the adjustment unit can be adjusted manually via a suitable handle.
[0023]
However, there is also the possibility of providing a braking device, which brakes the rocking movement of the rocking device about the rocking axis. This braking device provides particularly good results when the rocker is mounted in the area of the front end of the seat.
[0024]
In addition, the braking device can have a direction of action that acts substantially perpendicularly to the rocking radius about the rocking axis of the rocking device. This measure results in an optimized force introduction into the braking device. Since the direction of the radius to be considered during rocking changes constantly, the braking device can be adapted to this rocking path by its direction of action, or make as large an approximation as possible in the direction of action of a straight line. (Tangents, strings, etc.). In particular, in cooperation with a spring device having a direction of action along the guide path, a direction of action that extends transversely to one another occurs, which assists each other in the desired positive connection.
[0025]
In order to generate a kind of rocking chair effect, the braking device can then have a progressively increasing braking effect. This means that the greater the oscillating stroke, the stronger the braking action, so that an even greater resistance is formed. In particular, in cooperation with the spring device, it is possible to generate various desired spring braking effects.
[0026]
The braking device can be configured at a relatively desirable cost as an elastomeric cushion. An initially small braking effect can hereby be very easily increased arbitrarily. With regard to elastomeric cushions, there are sufficient proposals in the prior art for suitable configurations to achieve a predetermined braking action.
[0027]
In general, a spring / braking device acts on the coupling transmission, which provides a progressively increasing spring / braking force, at least during the downward and rearward movements of the seating part, depending on the design. Good. All coupling transmissions therefore take part in this spring braking process of the associated device.
[0028]
It is furthermore advantageous if, according to one variant, for the required course of movement, the guiding path is convexly curved towards the seating part. In this case, a configuration having an arc shape, a parabolic branch shape or the like becomes a problem.
[0029]
In that case, as desired, the averaged logical center of curvature of the guide route can be below the chair installation surface. This leads to a guiding device that is designed to be very flat, since a relatively flat curve course can be selected by the curvature. Nevertheless, in cooperation with the rocking device, an ergonomically desirable inclination of the seat can be achieved.
[0030]
Advantageously, a pedestal can be provided, the guide path being arranged in the upper end region of the pedestal. Here, a five-arm pedestal having a central support column and running rollers in the respective end sections of the support arm can be used, for example, as is usual in office chairs.
[0031]
If possible, a base rocking position can be provided in the upper end region of the pedestal as well. At this time, the support of the base swing position is directly performed via the pedestal. The same applies to configurations having a guidance route arranged here.
[0032]
The pedestal can be configured to be adjustable in height as desired. Such a mechanism is well known by office chairs and improves the overall adjustability of the chair.
[0033]
Preferably the chair can have a head support. This is particularly advantageous when the seating part and possibly the backrest are moved very far backwards or are swung downwards. Moreover, the optional backrest does not need to be configured too high to serve a similar purpose.
[0034]
Preferably the head support can be connected to the seating part. This offers a very special advantage. In other words, the head support carries out a running or rocking movement of the seating part, since the head support is connected to the rocking device which can travel along the guide path via the support part. If the chair has a backrest that is forcibly connected to the seating part, and this backrest advances, for example, by a larger swing stroke than the seating part, the head support responds to the head of the user of the chair and places it on the backrest. Strengthens and supports the rocking movement backwards. Therefore, the greater the swing back, the better the feeling of support, especially in the head area. This provides a very comfortable sitting sensation, especially during rocking movements.
[0035]
This idea also has consequences, in particular in claim 29, relating to the chair described in the claims. This includes a swingably arranged seating portion, a swingably arranged backrest, and a force-coupled, forcibly coupled swinging connection between the seating portion and the backrest. In addition, a head support is provided, which is movably connected (directly or without transmission) to the seating part. Heretofore, coupling the head support to the chair back has always been common in the prior art. At this time, arranging the head support portion on the movable seating portion gives the user of the chair a sense of reliable support, especially when the seating portion is largely swung downward and backward. The term "kinetic connection" is to be understood as meaning a direct untransmitted ("direct") connection with the seating part (for example, swinging and straight travels of the same magnitude). The seating part and the head support therefore carry out a common movement, while the backrest carries out a transmitted movement thereto.
[0036]
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0037]
The office chair 1 shown in FIG. 1 generally comprises a base area 2 and a seating area 3 arranged above it.
[0038]
The base area 2 comprises a leg part 4 having five support arms 5 extending radially away from the center, in the free end area of these support arms, each projecting downward and pivotally arranged. One traveling roller 6 is mounted. At the center of the base area 2, a support column 7 projects upward. The running roller 6 defines a chair mounting surface by its lower contact point, and the chair mounting surface is covered by the base when the running roller 6 is placed on the base. At the upper end of the support column, whose height can be adjusted, there is a base block 8, which allows for the connection of the seating area 3 to the base area 2. The base block 8 on the one hand provides a guide path 9 which is directed obliquely upward and is convexly curved. Furthermore, the base block 8 has a base rocking position 10, which has a horizontal rocking axis. The base block 8 is mounted on the upper end of the support column 7 so as to be rotatable about a vertical axis. The guidance route 9 is only shown schematically. The schematic guide path 9 is to be understood alternatively as a comprehensive guide structure along a sliding or rolling surface, which enables a supporting movement movement.
[0039]
On this guide path 9, a guide rail 11 also shown schematically is movably guided. By its curvature, the guide rail 11 is aligned with the curved shape of the guide path 9 and can slide along it in a defined manner. The averaged center of curvature of the guide rail 11 or the guide path is below the logical chair mounting surface. The guide rail 11 is thereby designed to be relatively flat and occupies only a very small overall height for its complete movement. In order to achieve a guidance that is clearly prevented from falling, the guide rail 11 grips the guide path 9 backwards, or vice versa.
[0040]
In the system, in the guide path 9 and in the guide rail 11, a spring device can be provided. This can be of an arrangement similar to that of DE 433 1987 or DE 199 00 454. However, there is also the possibility of abandoning the steadily decreasing spring force growth according to DE-A-199 00 544. The desired spring action can be achieved, for example, via a simple tension spring suspended on the base block and on the other end suspended on the guide rail 11. Reference numeral 12 designates an adjusting handle for adjusting the spring action of the spring device. With this spring device, the seating area 3 is always returned to the position shown in FIG. The adjusting handle is most often formed by a rotary knob, which can adjust the mounting base of the spring device, such as via a screw mechanism or a gear mechanism.
[0041]
At the front end of the guide rail 11, which is a component of the swing device, there is a swing axis 13 having a horizontal alignment. A front end region 14 of the seat portion 15 is swingably disposed on the swing axis 13. The seat part 15 with the cushion cover 16 can therefore be moved rearward and downward in combination by the guide rail 11 along the guide path 9, with the additional swing about the swing axis 13. Exercise is possible. In order to carry out this movement in a positive connection, a rocking connection element 17 is provided, which is rockably mounted at a base rocking position 10 on the base block 8 and which In the upper range, the state is shifted to the backrest 18 of the seating range 3. In the rear end region, the seating portion 15 comprises a vertically extending strut 19 in a neutral position, the upper end of which is articulated to a connecting element 17 via a hinge position 20 having a horizontal hinge axis. I have. The resulting coupling gearing now takes into account the forcibly guided swing of the seating surface 21 of the seating part 15 and the support surface 22 of the backrest 18.
[0042]
Since the tube structure schematically shown in FIG. 1 can be configured exactly the same on the other side of the chair, some of the aforementioned components are also present symmetrically on the other side and in the middle It is self-evident that the space is filled with some kind of filling for the cushion cover 16 and the backrest.
[0043]
Between the upper side 23 of the guide rail 11 and the seating part 15 or the lower side 24 of the cushion cover 16 there is a braking element in the form of an elastomeric cushion 25, which cushions the seating part 15 around the pivot axis 13. When swinging, a progressive braking action is considered. The elastomeric cushion 25 can be variously configured for the desired braking action in various ways, based on its material composition or its formation. However, other braking devices can be used to achieve the same or similar effects.
[0044]
The spacing between the swing axis 13 and the base swing position 10, the spacing between the swing axis 13 and the hinge position 20, the spacing of the hinge position 20 with respect to the base swing position 10, and their mutual spatial relationship. Since the proper grouping takes into account the desired force-coupled movement under the influence of the formation of the guide path 9 and the guide rail 11, the seating part 15 in the case of elasticity moves downward and rearward, and At the same time, it leans backward. The tilting takes place here not only around the pivot axis 13 but also around an averaged center of curvature, which is given in advance by the guide path 9. However, at the same time, the support surface 22 of the backrest 18 is also inclined downward and backward. The force connection causes a transmission between the seating surface 21 and the support surface 22. In this embodiment, the angle value transmission between the support surface 22 of the backrest 18 and the seating surface 21 of the seating portion 15 is 2: 1.
[0045]
This time, the rearward inclination of the seating area 3 of the office chair 1 is shown in detail in FIG. It can in particular be seen that the guide rail 11 has been moved back and down along the guide path 9. As a result, the distance between the swing axis 13 and the base swing position 10 is reduced. Due to the fact that the distance between the pivot axis 13 and the hinge position 20 and the distance between the base rocking position 10 and the hinge position 20 remain constant, the transmission already mentioned above takes place. Therefore, the support surface 22 is inclined so as to be farther away rearward than in the case of the seating surface 21. During this process, spring devices (not shown in detail) in the system, the guide path 9 and the guide rail 11 swing inward or outward (depending on whether compression or tension springs are used). The compression of the elastomeric cushion 25 between the upper side 23 of the guide rail 11 and the lower side 24 of the seating part 15 takes place. This elastomeric cushion 25 is designed to ensure that there is always greater resistance to further downward and rearward movements and that the chair user has a safe distance.
[0046]
It can also be seen from FIG. 3 that in addition to the neutral position shown in FIG. 1 in which the seating surface 21 is arranged substantially horizontally, there is also the possibility of tilting it slightly forward. In this case, the possibility of sliding further forward and upward along the guide rail 9 can be provided, for example, by adjusting a stop, not described in detail, of the guide rail 11. It can be seen very well in FIG. 3 that the adjustment handle 12 is arranged much closer to the base block 8 than in FIG. A slightly forwardly inclined seating surface 21 is often highly desirable for many seating situations, especially at work sites. Correspondingly, the support surface 22 of the backrest also tilts forward together by the positive connection of the connecting transmission. With the fixing of the predetermined stop, the office chair 1 can also be operated in the event of a load loss, since this forwardly inclined position 3 can also act as a new neutral position, at least for a spring device not shown in detail. It is repeatedly pushed back to this position.
[0047]
Now, in FIG. 4, the effect of the overall structure can be seen very clearly by comparing the positions according to FIGS. The seating surface 21 is inclined by an angle value α, while this is done on the support surface 22 of the backrest 18 by an angle value β. In this case, the angle value β is twice as large as the angle value α. As already mentioned above, this is caused by the connecting gear, in particular by the connecting element 17. Since the pivot axis 13 moves only slightly downwards or backwards, the front end region 14 likewise has decreased very slightly, while the rear region of the seating surface 21 has decreased considerably. Can also be recognized very well in FIG.
[0048]
Note that in this position, the angle α has a vertex that is moved by the pivot axis 13. This takes place by means of a combined movement along the guide path 9.
[0049]
The structure according to the invention makes it possible to realize an office chair 1 that offers optimum oscillating or tilting characteristics from an ergonomic point of view, especially when the configuration is to be configured as stable as possible. The ergonomically desirable transmission between the seating surface 21 and the support surface 22 of the backrest 18 does not cause an excessive lowering of the seating surface 21. On the contrary, a comfortable rocking effect is achieved by a progressively increasing spring force, so that the uncomfortable spacing of rocking backwards is avoided.
[0050]
In addition, the chair can still be provided with a head support, an armrest, a backrest height adjustment, a spine support and a seating depth adjustment. Other adjustment possibilities, in particular in the office chair range, are likewise possible. There may also be restraints that allow the seating part or backrest to be fixed at any arbitrary position or at a preselected position.
[0051]
Next, a second embodiment of the office chair 1 according to the present invention will be described in detail with reference to FIGS. Only the main differences with respect to the previous embodiment are entered, so reference is made to the preceding description with regard to structurally identical or operatively identical elements. To this end, the same reference numbers are used for structurally identical or operatively identical components.
[0052]
In addition to a somewhat different arrangement of the support arm 5 of the leg part 4 and of the thicker support post 7 on which the spring braking device already customary for office chairs is arranged, the illustrated office chair 1 has, inter alia, its straight line. Is different in the point of the guide route 9. The guide rail 11 passes through the guide route 9, and the guide route is configured as an inverted C-profile 27. The spring damping mechanism is thereby completely covered upwards by the closed cross-bridge 26 of the C-profile 27 (see in particular FIG. 7). Therefore, the elastomeric cushion is likewise arranged in the area enclosed by the C-profile 27. A handle 12 for adjusting the neutral position is mounted near the pivot axis 13 in the front area. The handle 12 acts on a spindle 28, which causes the desired adjustment between the guide rail 11 and the C-profile 27.
[0053]
Another important difference with respect to the previous embodiment lies in the configuration of the struts 19 of the seating area 3 which at this time are guided via the intermediate piece 29 to the hinge position 20. In the basic position shown in FIG. 5, the struts 19 extend parallel to the area of the connecting element 17 which transitions to the backrest 18, while the intermediate piece 29 moves vertically away from the struts 19 in the hinge position 20. Extending to This configuration of the struts 19 provides a lateral restriction of the seating area 3, with the struts 19 transitioning to an armrest 30 at its upper end. The armrest extends approximately parallel to the seating surface 21.
[0054]
The embodiment shown in FIGS. 5 to 7 utilizes a head support 31 having a cushion, which is located on the upper end of the backrest 18. The head support 31 is arranged in the rocking housing 32, wherein the rocking can take place only against a resistance, for example in the form of a multiple locking attachment. Following the mounting and holding portion of the swing accommodation portion 32, the mounting and holding portion is mounted on the upper end of the holding column structure 34. In the holding strut structure 34, two struts or one strut made by bending can be an issue. The strut structure extends substantially parallel to the backrest 18 starting from the mounting holder 33 in the base position of the chair. At this time, the free pole end 35 is guided outward and to the hinge position 20. The free column end 35 is connected to the intermediate piece 29 in the region of the hinge position 20 and thereby to the seating area 3. Therefore, the head support 31 performs the same swinging and rearward movement with the seating surface 21. This means that the swing angle of the seating surface 21 evident from the comparison between FIGS. 5 and 6 is the same as the swing angle of the head support 31. In contrast, the backrest 18 swings in the usual manner by twice the angle value at the transmission ratio selected here by the coupling transmission. It can be clearly seen in FIG. 6 that the head support 31 projects significantly more than the upper end of the backrest 18 than in FIG. The head support 31 therefore adapts to the chair user's head as compared to the backrest 18 when the seating portion 15 and the backrest 18 swing back. Therefore, the chair user is informed of the feeling that stronger head support is performed during the backward swing, and thus the seating sensation is more reliably sensed during the backward swing.
[0055]
The head support 31 may basically be provided with a height adjustment, which is configured in the upper plug-in area, for example, via a corresponding formation of the mounting holder 33 and the holding strut structure 34. be able to. In the retaining strut structure 34, bent metal bars are a problem, which results in a relatively stable support.
[0056]
Next, a third embodiment of the office chair 1 according to the present invention will be described in detail with reference to FIGS. Only the main differences with respect to the previous embodiment are entered, so reference is made to the preceding description for structurally identical or operatively identical elements. To this end, the same reference numbers are used for structurally identical or operatively identical components.
[0057]
In this case, the basic block 8 comprises a plate bending portion 36 and two box guides 37 arranged parallel to each other. The box guide 37 is U-shaped in cross section, so that the coil tension springs 38 respectively arranged thereunder are accommodated therein. The front end of the box guide 37 is closed by a holding plate 39. One end of each of the corresponding coil tension springs 38 is mounted inside the holding plate 39. In the center of the plate bending part 36, a receiving part 40 for the mounting pin 41 is provided. The rotation relative to the leg part 4 takes place in the support column 7 as usual. Suitable systems for constructing such support columns 7 are well known and widely used.
[0058]
The guide rail 11 is formed by a pair of side rails 42, and the rear ends of the side rails are connected to each other via a reinforcing frame 43. Furthermore, the guide rail 11 comprises a rail cover 44 configured as a synthetic part. The side rails 42 and the reinforcing frame 43 are arranged in a rail cover 44. At this time, the side rails 42 are mounted on the protrusions 46 at an interval parallel to the side wall 45 of the rail cover 44. The lower side of the rail cover 44 therefore slides along the upper side of the box guide 37, while the side rails 42 extend along the side of the box guide 37 opened by the rear. Has been guided. The mounting of the box guide portion 37 in the plate bending portion 36 is performed via a mounting housing portion 40 arranged at the center. The frame 43 allows it to contact the rear end face of the box guide 37 and is therefore used as an end stop for the neutral position of the office chair (described further below).
[0059]
In the front area of the rail cover 44 there is a brake block receiving part 47 in which the elastomer cushion 25 is arranged. Below this receptacle there is a screw hole 48 extending parallel to the direction of movement of the guide path 9. The spindle 28 is housed in the screw hole 48 so that the spindle 28 can be screwed in and out. The head of the spindle 28 is rotatably held on a transverse rail 49, which is connected to the front end of the side rail 42. Arranged on this transverse rail 49 is an adjustment handle 12 and a movement mechanism, not shown in detail, for example in the form of a screw gear engaged in the spindle 28 for moving the spindle 28. Rail cover 47 moves along spindle 28 as rotation of adjustment handle 12 causes spindle 28 to rotate about its axis. The bridging strips 50 extending parallel to the side rails 42 cooperate with the pins 51 arranged on the side of the box guide 37 to prevent the guide path 9 from coming off.
[0060]
The second end of the tension spring 38 is attached to the rear closed end of the rail cover 44. Further, for this configuration of the rail cover 44, a cover hood 52 is still covered for optical reasons.
[0061]
In the front area of the frame of the seating part 15, a pressing rail 53 is mounted, which can be brought into contact with the elastomeric cushion 25.
[0062]
The elastomer cushion 25 projects beyond the upper side of the rail cover 44 and the cover hood 52, and is compressible by the pressing rail 53.
[0063]
Although the third configuration is shown without armrests and head support, this configuration may obviously be equipped with these components in accordance with the description above with respect to the second embodiment.
[0064]
Next, the course of movement along the guide route 9 of the third embodiment will be described in detail with reference to FIGS.
[0065]
FIG. 9 shows an upright neutral position. Since the rail cover 44 has been moved completely rearward and downward via the adjustment handle 12, the tension spring 38 is under maximum initial stress in the neutral position. In the neutral position, the reinforcing frame 43 contacts the rear side of the box guide 37 and the mounting housing 40. The elastomer cushion 25 is completely released from tension, but almost almost touches the lower side of the pressing rail 53. At this time, starting from this neutral position, the chair is loaded and moves to a position inclined backward according to FIG. It can be clearly seen that the tension spring 38 is still taut. The travel distance of the rail cover 44 relative to the box guide 37 can be estimated by the distance between the box guide 37 and the rear side of the mounting frame 40 with respect to the reinforcing frame 43. Therefore, the box guide 37 projects relatively largely from the rail cover 44. The stop of the receptacle 47 in the mounting receptacle 40 also provides a precisely defined final position for rearward swinging or backward movement along the guide path 9.
[0066]
At this time, the elastomer cushion 25 has been considerably compressed by the pressing rail 53. Thus, in co-operation with the tension spring 38, a progressive spring / braking action is obtained, which gives the chair occupant a safe feeling when swinging backwards. By pressing the pressing rail 53 against the front area of the elastomeric cushion 25, the elastomeric cushion develops its full braking action.
[0067]
FIG. 11 differs from FIG. 9 only in that the rail cover 44 has been moved beyond the adjustment handle 12 to its frontmost position. As a result, the pressing rail 53 is already in contact with the central area of the elastomer cushion 25 in the neutral position shown in FIG. When swinging backwards to the position shown in FIG. 12 and moving down along the guide path 9, the pressing rail 53 still acts only on a part of the elastomeric cushion 25 and therefore has a braking characteristic Is also clear and different. The tension spring 38 is no longer significantly prestressed in the neutral position shown in FIG. 11, as in FIG. This setting is particularly suitable for light persons, whereas the setting according to FIG. 9 is suitable for heavy persons. Also in the setting according to FIGS. 11 and 12, suitable stop means take into account the stop in the position shown in FIG.
[0068]
It is further supplemented that various braking characteristics can be generated based on the formation of the elastomer cushion 25 and the pressing rail 53. The material properties of the elastomeric cushion 25 and its configuration or structure also allow for a change in the braking properties. Depending on the selected neutral position (set via the adjustment handle 12), the pressing rail 53 is provided with various configurations of the elastomer cushion 25 (in order to obtain a predetermined braking course over the course of the swinging of the seating surface 21). Material and the shape or structure of the elastomeric material). The elastomeric cushion 25 can be made of various types of materials as constituent materials.
[Brief description of the drawings]
FIG.
1 is a schematic side view of a first embodiment of an office chair in an upright position.
FIG. 2
FIG. 2 is a schematic side view of the office chair according to FIG. 1 in a position inclined backward.
FIG. 3
FIG. 2 is a schematic side view of the office chair according to FIG. 1 in a position inclined forward.
FIG. 4
FIG. 3 is a schematic view of the office chair according to FIG. 1 in which a neutral position according to FIG. 1 and a backward inclined position according to FIG. 2 have been entered;
FIG. 5
FIG. 7 is a schematic side view of a second embodiment of the office chair in an upright neutral position.
FIG. 6
FIG. 6 is a schematic side view of the office chair according to FIG. 5 in a position inclined backward.
FIG. 7
FIG. 6 is a schematic rear view of the office chair according to FIG. 5.
FIG. 8
FIG. 9 is a schematic development view of a third embodiment of the office chair, in which connection of a seating surface and a backrest is omitted.
FIG. 9
Fig. 4 is a full cross-sectional view of the guide path of the office chair including the filled seating surface, with the chair in an upright neutral position with maximum weight setting.
FIG. 10
Fig. 10 is a view similar to Fig. 9, wherein the office chair is in a position inclined backward.
FIG. 11
FIG. 9 is a full cross-sectional view of the office chair according to FIG. 8, including the seated surface inscribed, wherein the office chair is in an upright neutral position with a minimum weight setting.
FIG.
Fig. 12 is a view similar to Fig. 11, wherein the office chair is in a position inclined backward.

Claims (29)

A seat, in particular an office chair, comprising a seating part (15) and a downwardly inclined guide path (9) for providing a combined downward and backward movement or a combined upward and forward movement for the sitting part (15) A rocking device with at least a horizontal rocking axis (13) is provided for rockably positioning (15), and the rocking device together with the seating part (15) has a guide path (9). Chairs, especially office chairs, characterized by being movably arranged along. Chair according to claim 1, characterized in that the guide path (9) is configured as a sliding or rolling path. Chair according to claim 1 or 2, characterized in that the maximum travel of the rocker along the guide path (9) is greater than 30 mm, preferably greater than 60 mm. 4. The chair according to claim 1, wherein the maximum swing angle of the swing device about the swing axis (13) is greater than 5 [deg.], Preferably greater than 10 [deg.]. A coupling transmission is provided, which forcibly couples the movement of the rocker along the guide path (9) and the rocking movement about the rocking axis (13). The chair according to any one of claims 1 to 4, wherein The coupling transmission is configured to perform a rocking movement about the rocking axis of the rocker during the downward and rearward movements of the seating portion (15) to assist in downward movement of the rear seating region. The chair according to claim 5, wherein the chair is provided. 7. The chair according to claim 1, wherein the swing axis of the swing device is arranged in the front seating area. The coupling transmission includes a coupling element (17) which, on the one hand, has a horizontal rocking axis which is spaced from a rocking axis (13) of the rocker in a base rocking position (10). A hinge connection (20) which is arranged so as to be able to swing around and, on the other hand, is spaced from the base swing position (10) and has a horizontal swing axis with the seating part (15). Chair according to one of the preceding claims, characterized in that the chair is likewise arranged at a distance from a pivot axis (13) of the pivoting device. Chair according to claim 8, characterized in that the guide path (9) and the base swing position (10) for the connecting element (17) are arranged stationary with respect to each other. Chair according to claim 8 or 9, characterized in that the connecting element (17) is configured as a component of the backrest (18). The support surface (22) of the backrest (18) and the seating surface (21) of the seating portion (15) form an angular ratio of 1.5: 1 to 2.5: 1, preferably 2: 1, and So as to be forcibly connected and tilted backward about the swing axis of the movement position (10) or backward about the swing axis (13) of the swing device moved along the guide path (9). The chair according to claim 10, characterized in that a coupling transmission is provided. 12. The method according to claim 1, wherein the swinging device has a guide rail, the guide rail being movably guided along a fixed guide path. The described chair. 13. Chair according to one of the preceding claims, characterized in that the support of the rocking device in the guide path (9) takes place approximately in the center of the mounting surface. 13. A spring device according to claim 1, wherein a spring device is provided, and at least a downward and rearward movement of the seat part is effected against the spring action of the spring device. Chair. 15. Chair according to claim 14, characterized in that the spring device has a working direction extending substantially along the guide path (9). Chair according to claim 14 or 15, characterized in that the spring device comprises an adjusting unit (12) for adjusting the spring action. 17. Chair according to one of the preceding claims, characterized in that a braking device (25) is provided, which brakes the rocking movement of the rocking device. 18. Chair according to claim 17, characterized in that the braking device (25) has a direction of action which acts substantially perpendicularly to the rocking radius about the rocking axis (13) of the rocking device. Chair according to claim 17 or 18, characterized in that the braking device (25) has a progressively increasing braking effect. 20. Chair according to claim 19, wherein the braking device (25) is configured as an elastomeric cushion. A spring / braking device acts on the coupling transmission, which provides a progressively increasing spring / braking force at least during the downward and rearward movement of the seat part (15). 21. A chair according to any one of claims 5 to 20 that does. Chair according to one of the preceding claims, characterized in that the guide path (9) is convexly curved towards the seating part (15). 23. Chair according to claim 22, characterized in that the averaged logical center of curvature of the guidance route (9) is below the chair installation surface. 24. Chair according to one of the claims 1 to 23, characterized in that a pedestal is provided and a guide path (9) is arranged in the upper end region of the pedestal. 25. Chair according to one of the claims 1 to 24, characterized in that a pedestal is provided and a base rocking position (10) is arranged in the upper end region of the pedestal. The chair according to claim 24 or 25, wherein the pedestal is configured to be adjustable in height. Chair according to one of the preceding claims, characterized in that a head support (31) is provided. Chair according to claim 27, characterized in that the head support (31) is connected to the seating part (15). A swingingly arranged seating portion (15), a swingably arranged backrest (18), and a forced forcing to perform a transmitted swing in which the seating portion (15) and the backrest (18) are forcibly connected 2. A chair according to claim 1, characterized in that a head support (31) is provided, the head support being movably connected to the seating part. Chair.