The invention relates to a chair with a base support
and a seat, wherein the seat is pivotally mounted on the base support
From the DE-A-10 2006 023 982
a chair with a seat, a base support and a backrest is known, wherein the seat is pivotally mounted on the base support and the backrest pivotally mounted on the seat and between the base support and seat a first spring system and between the seat and backrest a second spring system is provided. In order to adjust the pivoting mobility of the chair to different heavy users, means are further provided for adjusting the spring behavior of both spring systems.
According to one
Embodiment of this chair is the spring system
from a spring element and a cooperating with this spring mechanism,
wherein the spring element, for example, by a suitable foam wedge
and the spring mechanism are formed by a pendulum rod. Of the
Pendulum rod is pivotable with its one end about a hinge axis
held on the base carrier and stands over with its other end
a rolling body with the seat in contact. During a pivoting movement
of the seat, the pendulum rod compresses the spring element,
so that a corresponding restoring force arises. to
Change of the spring characteristic of the spring system is also a
indentor body in contact with the spring element
slidably mounted on the pendulum rod.
Spring system is designed such that the spring element
in the basic position of the chair even with different weights
Users are essentially unencumbered and unencumbered in this
Starting position a displacement of the indenter
can be made.
In order to
the spring system in the basic position as possible unloaded
is, the power transmission line of the pendulum rod in
Contact area with the seat as vertical as possible to the seat
be aligned. However, this in turn makes the response difficult
in a pivoting movement of the seat due to the between seat
and pendulum rod resulting frictional forces.
From the WO 2007/110732
is also known a chair whose seat is pivotally mounted on a base support, wherein the seat is cushioned by a lever arm designed as a leaf spring. During a pivoting movement of the seat, this lever arm comes into contact with a displaceable support. The position of the support is automatically shifted depending on the weight of the user. To allow a displacement of the support, the leaf spring-like lever arm must not come into contact with the support in a loaded basic position of the chair. This is ensured by a toggle lever system between the base support and the seat, which supports the seat in its basic position. The adaptation of the chair to different user weights, however, requires a relatively complex chair mechanism.
In the EP-A1-1 647 207
a chair is described with a seat and with a mechanism for tilt-adjustable attachment of the seat to a seat support, wherein the mechanism comprises a toggle assembly which is supported by a compression spring and a torsion spring. To adjust the restoring force, the bias of the torsion spring is changed by means of a spindle. However, the setting of a harder bias requires a certain amount of force.
Invention is based on the object, a chair of
specify the above type, which with a simple mechanism
a smooth adaptation of the chair to the user's weight
allows and also a slight response
the seat is ensured during the pivoting movement.
The object is solved by the features of claim 1.
The seating furniture according to the invention consists essentially of
- A base support and a seat, the seat being pivotally supported on the base support,
- At least one lever system provided between the seat and the base support, which is designed in the manner of a toggle lever system which has at least two force transmission elements in contact with one another, wherein the one power transmission element is pivotably articulated to the base support and the other power transmission element is pivotably articulated to the seat,
- - At least one spring element which is articulated to the lever system such that it generates a restoring force during a pivotal movement of the seat by its deformation, and
- - Setting means for varying the restoring force, which cause a change in the mechanical articulation of the force element to the lever system, without changing the deformation of the spring element.
By forming the lever system in the manner of a toggle lever system could be compared to the DE-A-10 2006 023 982
the response to a pivotal movement of the seat can be improved. This could also for the adjustment of the Resetting force of the spring-loaded lever system required effort can be further reduced. Unlike the EP-A1-1 647 207
can be changed in the seating according to the invention, the restoring force, without changing the deformation of the spring element. As a result, a particularly smooth adjustment of the chair to the user weight is possible.
Embodiments of the invention are the subject of the dependent claims.
Change in the mechanical articulation of the spring element
to the lever system is preferably carried out by means for moving
the mechanical articulation of the spring element to the lever system.
According to one
preferred embodiment of the invention take the two power transmission elements
or their power transmission directions, in the unloaded
Position of the seat at an obtuse angle in the range of 180 °> α> 140 °, preferably one
Range of 180 °> α> 150 °.
can be provided that the at least one spring element via
Connecting means with one of the two power transmission elements
is connected, wherein the connecting means by the adjusting means
with respect to a pivot of the power transmission element
are displaceable. The connecting means can, for example, by
a bolt and a slot are formed and the adjusting means
may have an adjustment that with the bolt
is related to its displacement. Also, the adjustment can
having a slot, wherein the bolt of the connecting means with
cooperates with both oblong holes.
To further simplify the adjustment, the adjustment means
furthermore a threaded spindle for displacement of the adjusting element
exhibit. The two power transmission elements can
be designed as an articulated lever arms connected.
However, it is also conceivable within the scope of the invention that, for example
one of the two power transmission elements designed as a sliding shoe
is that with curved mating surfaces at the other
Power transmission element or on the seat or base support
interacts. Furthermore, one of the two power transmission elements
be designed as a roll that rolls on curved mating surfaces.
According to one
preferred embodiment of the invention is the seating
designed such that the seat is pivotable about an axis of rotation
is mounted on the base support, wherein the seat on the base support
only about this axis of rotation and the at least one
spring-loaded spring system supported pivotally
The chair can also have two spring-loaded lever systems
in the manner of a toggle lever system, wherein the adjusting means
for changing the restoring force of the spring-loaded
Lever systems a common manually operable adjustment
exhibit. Nevertheless, the two spring-loaded lever systems
be formed so that they are mutually adjustable but independent
can work from each other. This is for example then
interesting, if the right and left side of the seat independent
are pivotable from each other.
Advantages and embodiments of the invention will be described below
the description and the drawings explained in more detail.
show the drawing
1 a schematic diagram of a chair with a spring-loaded lever system in the basic position of the seat, wherein the force element is mechanically hinged in a first position to the lever system,
2 a schematic diagram of the seating according to 1 in a reclined position of the chair,
3 a schematic diagram of a chair with a spring-loaded lever system in the basic position of the seat, wherein the force element is mechanically hinged in a second position to the lever system,
4 a schematic diagram of the seating according to 3 in a reclined position of the chair,
5 a schematic side view of the chair in the area of the lever system,
6 a three-dimensional view of the lever system according to 5 and
7 a plan view of the lever system according to 5 ,
Based on 1 and 2 The basic principle of the chair is described below. The chair is, for example, a chair, in particular an office chair. The seating furniture essentially consists of a base carrier 1 , which is connected to a non-illustrated foot and a seat 2 wherein the seat is about a pivot axis 3 pivotable on the base support 1 is held. In particular, the seat can have a backrest and possibly armrests.
Between seat 2 and basic carriers 1 is also at least one spring-loaded lever system 4 formed in the manner of a toggle lever system. This spring system 4 has two communicating with each other power transmission elements 40 . 41 and a spring element 42 on. The power transmission element 40 is pivotable about a pivot axis 43 at the base carrier 1 and the other power transmission element 41 pivotable about a pivot axis 44 at the seat 2 hinged. The two power transmission elements are rotatably mounted about a pivot axis 45 in contact with each other.
With a pivoting movement of the seat 2 around the pivot axis 3 from the in 1 shown position in the inclined position according to 2 kinks the lever system 4 a, wherein the spring element 42 generates a restoring force. This restoring force is effected by the elongation of the spring element by the amount a.
In order to provide the same slewing comfort for users of different weights, it is necessary that the restoring force of the spring element 42 can be adapted to the weight of the user. Thus, the adjustment of the restoring force can be done without much effort, the spring element should be as little as possible.
In the illustrated lever system in the manner of a toggle lever system, the spring element 42 not loaded at all, if the two power transmission directions of the force transmission elements 40 . 41 aligned with each other, ie would include an angle of 180 °. Since a buckling of the lever system can not take place at this position of the two power transmission elements, the angle α between the two force transmission elements 40 . 41 in the basic position of the seat according to 1 set as an obtuse angle in the range of 180 °>α> 140 °, preferably 180 °>α> 150 °. In this angular position, the spring element 42 loaded only with a relatively small force when the seat, so that an adjustment of the restoring force can be done in a simple manner. Depending on the type of spring system, the most diverse adjustment options can be considered.
In the 1 to 4 are adjustment means 47 for changing the restoring force shown schematically by an arrow. The adjustment means 47 cause a change in the mechanical articulation of the spring element 42 to the lever system 4 , here to the power transmission element 40 without changing the deformation of the spring element. The change in the mechanical linkage can be done for example by shifting the articulation point. In the 1 and 2 is the spring element in a first position mechanically hinged to the lever system, while it is in the 3 and 4 in a second position. A comparison of 2 and 4 shows very clearly that the deflections (a and b) of the springs at the same angular position β of the power transmission elements 40 . 41 are different sizes, which also set different restoring forces.
Based on 5 to 7 is an example of a lever system 4 and its adjustment for the restoring force described in more detail. In this case, the same reference numerals are used for the same parts to a comparison with the schematic diagrams according to the 1 to 4 to facilitate.
The seat 2 is simplified in the illustrated embodiment by two seat support 2a . 2 B presented with respect to the base carrier 1 around the pivot axis 3 are pivotable. Each of the two seat supports acts with a spring-loaded lever system 4 together, which are formed substantially identical. In the following, therefore, reference will only be made to one of the two lever systems.
The power transmission element 40 is formed by a lever which is about the pivot axis 43 at the base carrier 1 is held. The second power transmission element 41 is formed in the illustrated embodiment as a sliding block, which on curved mating surfaces on the seat support 2a or on the other power transmission element 40 is slidable.
The power transmission element 40 is formed in the illustrated embodiment, approximately U-shaped, wherein the one leg 40a with the power transmission element 41 in contact and the other leg 40b with the spring 42 via connecting means 46 communicates. The spring element 42 is with its one end 42a at the base carrier 1 set while the connecting means 46 stuck with the other end 42b are connected and have two parallel plates, the leg between them 40b of the power transmission element 40 take up.
Both the two plates of the connecting means 46 as well as the thigh 40b have long holes 46a respectively. 40c on, which are congruent, so a bolt 46b can be inserted through it. About this bolt 46b and the slots 46a . 40c becomes the restoring force of the spring 42 on the power transmission element 40 transfer. As in particular from 5 becomes apparent causes a rotation of the power transmission element 40 around the pivot axis 43 in the direction of the arrow 5 on off Pulling the spring together 42 (see also 1 ).
A change in the restoring force of the spring 42 can be due to a displacement of the bolt 46b in the oblong holes 46a . 40c can be achieved, since thereby the distance between bolts 46b and pivot axis 43 changed, which results in a change in the length of the effective lever arm (see also 2 and 4 ).
For this purpose, adjustment means 47 provided, the one, for example, like a backdrop, adjusting 47a and a manually operable threaded spindle 47b include. The threaded spindle is shown here only schematically as a double arrow. The fork-like adjustment 47a also has a slot 47c on, which concerning the oblong holes 40c respectively. 46a is arranged rotated substantially 90 °. A shift of the adjustment 47a in the direction of the double arrow 47a thus causes a displacement of the bolt 46b , whereby the point of application of the spring 42 on the power transmission element 40 with respect to the pivot axis 43 can be changed. In this way, the spring behavior can be adapted to the weight of a user. The system is designed so that it moves when the bolt 46b to no appreciable deformation of the spring element 42 comes. Therefore, essentially only the frictional forces of the bolt in the oblong holes must be overcome.
Is the entire spring-loaded lever system designed so that the spring 42 in the upright basic position of the chair according to 1 is hardly loaded even if the user has taken place on the seating, this can be a displacement of the bolt 46b without much effort by turning the threaded spindle 47b cause. Once the user leans back, the mist system buckles, causing the spring 42 generates a restoring force.
In the context of the invention, of course, other connecting means 46 or adjusting means 47 conceivable.
In the embodiment described above, the spring element 42 designed as a tension spring. Of course, it would also be conceivable that a compression spring is used, in which case the bolt 46b via a drawbar guided by the spring to the end 42a could be connected. Then it would not be the end 42a but the end 42b with respect to the base carrier to hold stationary.
Depending on the application, it may be advantageous to use two spring-loaded lever systems 4 to arrange parallel, like that from the 6 and 7 evident. The adjustment means 47 are then suitably but form so that the adjustment of the restoring force of both lever systems via a common manually operable adjustment, in particular in the form of a threaded spindle 47b , can be done.
The spring-loaded spring system described above 4 can be particularly advantageous in a seating provide, in which the seat only over the pivot axis 3 and that at least one spring-loaded spring system 4 supported on the base support. In this way, a structurally simple chair mechanism can be realized, which requires little space. Nevertheless, it allows a simple and energy-saving adjustment to the user's weight and a light response.
QUOTES INCLUDE IN THE DESCRIPTION
The documents listed by the applicant have been automated
generated and is solely for better information
recorded by the reader. The list is not part of the German
Patent or utility model application. The DPMA takes over
no liability for any errors or omissions.
Cited patent literature
- - DE 102006023982 A [0002, 0011]
- WO 2007/110732 
- - EP 1647207 A1 [0007, 0011]