DE202005017321U1 - Chair, especially office chair - Google Patents

Abstract

Chair, especially office chair (2), with one on a support frame (35) about a backrest support (37) hinged backrest (5) and a seat surface (3) which can be moved synchronously therewith, in a Aufpunkt (15) over a seat link pivotally connected to the support frame (35) is, being the backrest wearer (37) and the seat link each rotatable on the support frame (35) are fastened, and wherein the backrest support (37) and the seat surface (3) spaced apart from each other a single intermediary coupling member with each other such are movably coupled, that a rearward tilting movement the backrest (5) in an upward pivoting movement the seat (3) translated becomes.

Description

The The invention relates to a chair, in particular an office chair, with a synchronous mechanism.

Modern high-quality office chairs are usually equipped with a synchronous mechanism, which ensures that the seat moves synchronously with the backrest. The synchronizing mechanism is usually formed by a backrest support, which is arranged on a central support frame, is movably connected to the seat. As a result, the movements of the backrest carrier are transmitted in synchronous movements of the seat. For the design of a synchronous mechanism offer different possibilities. For example, from the DE 101 22 948 C1 an office chair removable, the seat inclines with a deflection of the backrest to the back towards the back. From the DE 42 19 599 C2 is an office chair removable, the seat is tilted forward with a deflection of the backrest to the rear. In both chairs shown, it is necessary to adjust the counteracting force for an inclination of the backrest according to the weight of a seated person.

From the US 6,709,058 B1 An office chair is known in which the tilting force of the backrest mechanically adapts to the weight of a seated person. For this purpose, the backrest support is bent over a pivot point on the support frame out up under the seat. By this bend in combination with the fulcrum, a rearward tilting movement of the backrest on the backrest support is converted into an upward movement of the seat. Since the acting on the seat Aufpunkt the backrest support performs a rotational movement, the seated person from the backrest opposite force is dependent on the absolute inclination of the backrest support.

It is the object of the invention, a chair of the type mentioned specify an alternative mechanism for automatic adjustment the one from the backrest an inclination counteracting force on the weight of the seated Person has.

These The object is achieved by a Chair, in particular an office chair, with a on a support frame over a backrest support hinged backrest as well as a synchronously movable seat, which in a Aufpunkt over a Seat link pivotally connected to the support frame is solved, being the backrest wearer and the seat link are each rotatably mounted on the support frame, and being the backrest wearer and the seat spaced apart from each other a single intermediary coupling member with each other such are movably coupled, that a rearward tilting movement the backrest in an upward Pivoting movement of the seat translates becomes.

The Invention is in a first step of the consideration out that the weight of a seated person is vertical after is directed down. Will over a suitably designed backrest support the tilting or rotary movement the backrest directly with the seat coupled, acts of the weight only with respect to the rotational movement tangential component in the point of view. But that is against the seated person acting counter force of the backrest of their inclination dependent.

In a further step, the invention of the consideration out, to overcome this disadvantage the seat with the backrest spaced apart from each other to connect an intermediate single coupling member movably. Consequently becomes the rotational movement of the backrest and thus of the back carrier over the Transfer coupling member to a movement of the seat. It offers the Coupling over the coupling link in contrast to a direct coupling additional mechanical degrees of freedom that allow the inclination of the backrest nearly in a uniform upward movement the seat implement. The basic principle is based on having an intermediary Coupling link for compensation of undesirable described dependence of the per angular difference of the backrest generated hubs of the seat be used by the absolute angle of inclination of the backrest can. In this way it becomes possible the one from the backrest exercised on a seated person Drag independent of their absolute inclination to hold approximately equal.

In a first advantageous variant, the coupling member is formed by a pull rod which connects the seat with the backrest support movable. The coupling of the backrest support to the seat surface via a pull rod provides additional mechanical degrees of freedom, which allow the desired movement of the seat. Such mechanical degrees of freedom are the length of the drawbar on the seat or the location of the attachment points of the drawbar on the backrest support and on the seat. In the case of a coupling of a rotary movement with a movable drawbar, the rotation caused parallel to the pull rod per rotation angle is dependent on the absolute rotational position. The described coupling between the seat and backrest support with a pull rod can therefore to compensate for the described undesirable dependence of the angle difference of Rückenleh ne generated hubs of the seat are used by the absolute inclination angle of the backrest.

advantageously, is the recliner over a Rotary bearing rotatably mounted on the bogie and has a pivot bearing in which the pull rod is rotatably mounted, which in the direction on the seat handlebar in front and towards the seat above the Swivel bearing is arranged over which the backrest wearer is attached. This geometry will be in the home or hibernate state of the chair in the attachment point, the angular position between the drawbar and the tangent of the rotational movement of the backrest support determined. By the specified position is achieved that a deflection of the backrest from its resting position from the beginning in an offset of the drawbar is implemented. By variation is be influenced whether a deflection the backrest to a big one or leads to a small offset of the drawbar.

advantageously, rejects the backrest an angled pivot arm on which the pull rod rotatable is stored. By means of an angled swivel arm, the pivot bearing receives, in which the pull rod is rotatably mounted, a material saving and simple execution be achieved.

In Another advantageous variant is the movable coupling of the back support with the seat on the backrest a lever arm arranged over couples the coupling member to the seat. Also, such a lever arm, by the backrest support itself formed or a separately attached to the backrest support further element allows, in terms of coupling additional mechanical degrees of freedom, the dependent from the deflection of the backrest or the backrest wearer the desired upward movement the seat enable. Such mechanical degrees of freedom are, for example, the length of the Hebelarmes, the design of the coupling member, the coupling of the Coupling link to the seat or the arrangement of for the lever arm required bearing.

to Training the lever arm, the backrest support, for example, an angled part have, which is mounted in a pivot bearing on the support frame. The over the Turning part outgoing part of the backrest support can then as such Lever be used.

In another advantageous embodiment the lever arm can be moved by a cranked rod connected to the backrest support be formed, which deals with the backrest support in a pivot bearing on the support frame rotates. The lever arm is then formed by the bent part of the rod.

to Training the automatic weight, in which a rearward tilting movement the backrest over the backrest support in an upward movement the seat is implemented, it is advantageous if the lever arm for coupling to the seat from below this strikes. In this case, the weight of the seat and The weight of a seated person down against the upward Lever arm. To create the coupling between the coupling member and the seat needs in this case no or only a simple mechanical Construction can be used by the form, friction or adhesion holding the coupled parts together. In other words, can in this embodiment the coupling member are guided loosely from below against the seat.

to Coupling of the lever arm to the seat is the coupling member advantageously as a seat surface side formed on the lever arm roller. This is a simple one and cost-effective Solution, enough for coupling Degrees of freedom forms.

to Creation of the desired upward movement the seat this is advantageously formed a backdrop, along the role is forced. By appropriate shaping of the backdrop, including present a given guideway can be understood, along which the role is performed, the desired movement the seat through the rearward tilting movement of the back support be set.

Especially then, when the lever arm for coupling abuts the bottom of the seat, which is Backdrop expediently formed as a rolling track, against which the role of the rolling track rolling supported. The interaction of the downward weight of the seat and the person sitting, and the lever arm upwards acting force by pressure of the seated person on the backrest and thus on the backrest, in particular, the roller is molded against a bottom of the seat Rolling pressed and forced along this.

Around an independent from the absolute inclination of the backrest against the back of a oppressive person sitting To achieve drag, it is advantageous if the backdrop regarding the seat tilted backwards down. This creates a defined deflection angle the backrest in a tilted position of the backrest support a higher stroke the seat as in an upright position.

Conveniently, the seat link is rotatably mounted on the seat. This allows for a rotational movement of the seat link relative to the Trä Regarded maintaining the orientation of the seat.

In An advantageous embodiment of the invention is the seat link as a joint element, in particular as a joint plate, with a formed first and a second pivot bearing, via which the seat with the support frame connected is. This embodiment is inexpensive and allows a mechanical simple, flexible coupling between the seat and the support frame.

In a further advantageous embodiment of the invention is the seat in a spaced from the Aufpunkt further Aufpunkt by means of a the support frame mounted seat guide element so led, that at an upward pivoting movement at the Aufpunkt overall a tilt of the seat out to the backrest is effected. In such a construction, the with increasing Inclination of the backrest increasing forward pressure of the seated person the appropriately aligned inclination of the seat collected. Slipping of the seated person is thus prevented. The guide the seat by means of the seat guide element in a further Aufpunkt thereby allows a great deal of freedom the design of the desired Synchronous movement of the seat in terms of the deflection of the backrest.

In another embodiment of the invention is also the seat guide element as a joint element, in particular as a joint plate, with two Drehlagern executed. About the Length of the Joint element or over the distance between the two pivot bearing is the movement of the seat in the other Point of reference the point of storage of the seat link adjustable.

In an alternative embodiment the invention, the seat link and the seat guide element are each as a Joint element, in particular as a hinge plate, with two pivot bearings executed. Here is the seat, connecting the two hinge elements hanging on the respective pivot bearing the support frame stored. Is over here the pull rod on the seat transfer an offset, so is the seat, the above the hinge elements on the support frame hangs, distracted overall. It leads the seat due to its swinging suspension with increasing inclination of the backrest a stronger one upward movement out.

Conveniently, are in the resting state of the chair, the lower pivot bearing of both joint elements in terms of the upper pivot bearing offset towards the backrest. This will guaranteed that starting from the resting state, a rearward tilting movement of the backrest from the beginning in an upward pivoting movement transferred to the seat becomes. This is cheap for the Realization of the desired automatic weight.

are both joint elements are not parallel in the rest position of the chair aligned or different lengths, so the deflection of the seat by means of an offset of the drawbar in addition to an upward movement in addition to a tilting movement of the seat. Advantageously, the distance of the pivot bearing of the joint element the seat guide element shorter as the distance of the pivot bearing of the hinge element of the seat link. As a result, in a simple manner, the tilting movement of the backrest in a tilting movement of the seat so implemented that this with inclination of the backrest tilted to this also.

In A particularly advantageous variant is the synchronization mechanism in total each arranged mirror-symmetrically to both sides of the seat. It is particularly appropriate, the Form hinge elements as flat hinge plates. By the arrangement the synchronization mechanism is laterally of the seat a reduction in the height reached between the lower edge of the mechanism and the upper edge of the seat. Thereby will the pack size of Reduced chair, creating a spatial compact folding or folding of the chair is made possible.

Conveniently, are the armrests and the backrest as in the backrest pluggable executed. For folding or folding the chair can then the armrests and the backrest Overall, the backrest support are removed and stacked to the remaining elements. With a removable chair column is thus created a compact collapsible chair, the one Synchronization mechanism with additional weight automatic includes.

embodiments The invention will be explained in more detail with reference to a drawing. Showing:

1 schematically in a side view of an office chair with weight mechanism in rest position, wherein the seat is mounted on a seat link hanging on the support frame,

2 in a side view schematically the office chair according to 1 in a deflected position,

3 in a perspective view of a partial view of an office chair, wherein the seat is coupled via arranged on a cranked rod rollers with the backrest support and

4 in a perspective view a partial view of an office chair, wherein the seat is coupled via arranged on an angled lever arm rollers with the backrest support.

In 1 is a schematic side view of an office chair 2 shown. The office chair 2 has a seat 3 and a backrest 5 on and is by means of a chair column 7 from a - not shown - pedestal worn. The office chair 2 also has armrests 33 on that with the backrest 5 form a functional unit. armrests 33 , Backrest 5 and seat 3 be centrally from a support rack 35 worn, which on the chair column 7 rests.

The insertable backrest 5 carrying reclining support 37 on which at the same time the armrests 33 are fastened pluggable, is about a pivot bearing 38 rotatable on the support frame 35 assembled. The seat 3 is hanging over a seat handlebar 15 and a seat guide member 10 on the support frame 35 attached. The seat handlebar 15 and the seat guide member 10 are each as joint elements 40 respectively. 41 educated. Here are the joint elements 40 and 41 over the upper, first pivot bearings 43 respectively. 44 on the support frame 35 rotatably mounted. The seat 3 is about the lower, second pivot bearing 45 and 46 with the two joint elements 40 respectively. 41 rotatably connected. In other words, the joint elements 40 and 41 over the seat 3 by means of the lower pivot bearing 45 and 46 coupled together.

Via an angled swivel arm 48 is the recliner 37 by means of the pivot bearing 49 movable with a drawbar 50 connected at the other end via the lower pivot bearing 45 of the joint element 40 with the seat 3 connected is.

The mechanism shown, consisting of swivel arm 48 , Pull bar 50 as well as the two joint elements 40 . 41 and the armrest 33 is mirror-symmetrical to both sides of the office chair shown 2 , Also the carrier frame 35 is designed accordingly symmetrical. The seat 3 is arranged hanging in between. The symmetrically designed swivel arms 48 overlap on both sides of the chair 2 the respective frames of the support frame 35 ,

To the functioning of the office chair 2 is in 2 in a side view schematic of the office chair 2 shown in a deflected position. About the pivot bearing 38 performs a rearward tilting movement of the backrest 5 to an upward rotation of the swing arm 48 , About the drawbar 50 is the for the alignment of the pull arm 50 parallel component of the rotational movement on the seat 3 transfer. Accordingly, the lower pivot bearing leads 45 on which the drawbar 50 on the seat 3 acts, an upward rotation from about 6 o'clock to 4 o'clock. About the seat 3 and the lower pivot bearing 46 this is also the joint element 41 deflected accordingly.

Overall, therefore, leads to a rearward tilting movement of the backrest 5 to an upward pivotal movement of the seat 3 , The distances between the pivot bearings are 43 . 44 . 45 and 46 such that in the resting position of the office chair 2 according to 3 the joint elements 40 and 41 are slightly inclined to each other. The joint element 41 in this case has a greater inclination than the joint element 40 , This causes the seat surface 3 with a downward tilting movement of the backrest 5 in addition to the upward pivoting movement at the same time a slope towards the backrest 5 ertährt.

Starting from the rest position of the office chair 2 according to 1 is the orientation of the drawbar 50 according to the rotational movement of the swivel arm 48 chosen so that the drawbar 50 with increasing tilt of the backrest 5 in the pivot bearing 49 rather tangential. In this respect leads with increasing inclination of the backrest 5 an equal angular offset to a larger offset of the drawbar 50 , Together with the angled coupling of the drawbar 50 to the joint element 40 This compensation is achieved in such a way that regardless of the absolute inclination position of the backrest 5 one on the office chair 2 seated person experiences an approximately equal drag. The stronger the inclination of the backrest 5 is, the more we per angle degree of inclination the seat 3 raised. The from the backrest 5 The counteracting force exerted on the seated person automatically adjusts to the weight of the seated person.

In 3 is shown in a perspective partial view of another embodiment of a weight automatic of an office chair. From the office chair is the backrest 37 or two of them on both sides of the support frame 35 guided spars recognizable, on which the backrest is arranged. Next is a part of the support frame 35 visible on which the seat 3 is hung swinging. This is the seat 3 on both sides of the symmetrically shaped support frame 35 each with two joint elements 40 respectively. 41 attached. For the swinging suspension are the joint elements 40 respectively. 41 each above upper, first pivot bearing 43 respectively. 44 on the support frame 35 and lower, second pivot bearings 45 respectively. 46 with the seat 3 rotatably connected.

To form the automatic weight is the seat 3 of which without a graphic representation of the upholstery and a seat cover only a seat 3 ' recognizable, opposite a gutter 51 of the support frame 35 spaced. In the area between the seat intake 3 ' and the gutter 51 protrudes a lever arm 52 Training a cranked rod 53 into it. The training for the lever arm 52 U-shaped bent rod 53 is at its two outer ends each have a pivot bearing 38 with the spars of the backrest 37 connected. The cranked rod 53 turns with the backrest 37 in the pivot bearing 38 ,

At the end of the lever arm 52 or at the crossbar of the bent rod 53 trained U are two rotatable on the pole 53 fixed rollers 56 arranged as coupling links. Against the roles 56 presses from above the weight of the seat 3 and the weight of any person sitting thereon. For coupling the seat 3 about the roles 56 to the backrest 37 are the seat intake 3 ' two scenes 57 molded, the at their recording a downwardly curved downhill runway 59 form.

In a downward tilting movement of the backrest carrier 37 by a Nachhintennen the seated person is the lever arm 52 the cranked rod 53 swung upwards. This will make the seat 3 counteracting the weight of the seated person pushed upward. In this movement, the roles run 56 each along the rolling track 59 the scenes 57 , Because the rolling tracks 59 curved down the back, learns the seat 3 with increasing deflection of the backrest or the backrest support 37 a growing hub upwards.

4 also shows in a perspective partial view of another embodiment of the automatic weight of the office chair. According to the in 3 again shown is the seat 3 in the symmetrically shaped support frame 35 on both sides by means of the joint elements 40 and 41 attached. The seat 3 is thus on the support frame 35 swinging in turn.

The seat 3 is at its rear end in turn from a gutter 51 of the support frame 35 spaced. In the intermediate space engages a lever arm 52 one which has an angled portion of the backrest led centrally in the office chair 37 represents. The backrest carrier 37 is with his the lever arm 52 forming angled part in the pivot bearing 38 rotatable at the gutter 51 of the support frame 35 attached. This is a support element 60 intended.

For coupling the lever arm 52 to the seat 3 are at the seat-side end of the lever arm 52 both sides rotatable rollers 56 arranged. These roles 56 couple from below accordingly 3 to a rolling track 59 two of the seat 3 ' molded backdrops 57 , The resulting movement of the seat 3 in a tilting movement of the backrest or the backrest support 37 corresponds to the one in 3 shown office chair.

2

office chair

3

seat

3 '

seat adapter

3 ''

Seat top

5

backrest

7

chair column

9

seat link

10

A seat element

15

reference point

27

Another reference point

33

armrests

35

support frame

37

backrest support

38

pivot bearing

40

joint element (Seat link)

41

joint element (Seating guide member)

43

upper pivot bearing

44

upper pivot bearing

45

lower pivot bearing

46

lower pivot bearing

48

swivel arm

49

pivot bearing

50

pull bar

51

gutter

52

lever arm

53

Cranked rod

56

role

57

scenery

59

rolling path

60

support element

Claims (21)

Chair, especially office chair ( 2 ), with one on a support frame ( 35 ) via a backrest support ( 37 ) hinged backrest ( 5 ) as well as a synchronously movable seat surface ( 3 ), which are in one place ( 15 ) via a seat link pivotally to the support frame ( 35 ), whereby the backrest support ( 37 ) and the seat link each rotatable on the support frame ( 35 ), and wherein the backrest support ( 37 ) and the seat ( 3 ) spaced from each other via a single intermediate coupling member are coupled to each other such movable, that a rearwardly directed tilting movement of the backrest ( 5 ) in an upward pivoting movement of the seat ( 3 ) translated becomes. Chair according to claim 1, wherein the coupling member by a pull rod ( 50 ) is formed, which is the seat ( 3 ) with the backrest support ( 37 ) movably connects. Chair according to claim 2, wherein the backrest support ( 37 ) via a pivot bearing ( 38 ) on the support frame ( 35 ) is rotatably mounted and a pivot bearing ( 49 ), in which the drawbar ( 50 ) is rotatably mounted, which in the direction of the seat link before and in the direction of the seat ( 3 ) above the pivot bearing ( 38 ) is arranged, over which the backrest support ( 37 ) is attached. Chair according to claim 2 or 3, wherein the backrest support ( 37 ) an angled swivel arm ( 48 ), on which the drawbar ( 50 ) is rotatably mounted. Chair according to claim 1, wherein on the backrest support ( 37 ) a lever arm ( 52 ) is arranged, which via the coupling member to the seat ( 3 ). Chair according to claim 5, wherein the lever arm ( 52 ) by one with the backrest support ( 37 ) connected cranked rod ( 53 ) is formed. Chair according to claim 5 or 6, wherein the lever arm ( 52 ) via the coupling member from below to the seat surface ( 3 ) strikes. Chair according to one of claims 5 to 7, wherein the coupling member as a seat surface side of the lever arm ( 52 ) arranged roll ( 56 ) is trained. Chair according to claim 8, wherein the seat surface ( 3 ) a backdrop ( 57 ) is formed along which the roll ( 56 ) is forced. Chair according to claim 9, wherein the scenery ( 57 ) as a rolling track ( 59 ) is formed, against which the role ( 56 ) along the rolling track ( 59 ) rollingly supported. Chair according to claim 9 or 10, wherein the scenery ( 57 ) with respect to the seat surface ( 3 ) is formed inclined backwards down. Chair according to one of the preceding claims, wherein the seat link rotatably on the seat surface ( 3 ) is stored. Chair according to one of the preceding claims, wherein the seat link as a joint element ( 40 ), in particular as a hinge plate, with a first ( 43 ) and a second pivot bearing ( 45 ) is formed, over which the seat ( 3 ) with the support frame ( 35 ) connected is. Chair according to one of the preceding claims, wherein the seat surface ( 3 ) in one of the Aufpunkt ( 15 ) spaced further point ( 27 ) by means of a on the support frame ( 35 ) seated guide element is guided such that at an upward pivoting movement of the seat ( 3 ) at the point of 27 ) a total of an inclination of the seat ( 3 ) towards the backrest ( 5 ) is effected. Chair according to claim 14, wherein the seat guide element as a joint element ( 41 ), in particular as a hinge plate, with two pivot bearings ( 44 . 46 ) is executed. Chair according to claims 13 and 15, wherein the seat surface ( 3 ), the two joint elements ( 40 . 41 ), via the respective pivot bearing ( 43 . 44 . 45 . 46 ) hanging on the support frame ( 35 ) is stored. Chair according to claim 16, wherein the pivot bearings ( 43 . 44 . 45 . 46 ) are spaced apart such that the tilting movement of the seat surface ( 3 ) is effected. Chair according to claim 17, wherein in its idle state the lower pivot bearings ( 45 respectively. 46 ) of the two joint elements ( 40 . 41 ) with respect to the upper pivot bearing ( 43 respectively. 44 ) each in the direction of the backrest ( 5 ) are offset. Chair according to claim 17, wherein the distance of the pivot bearing ( 44 . 46 ) of the joint element ( 41 ) of the seat guide element is shorter than the distance of the pivot bearing ( 43 . 45 ) of the joint element ( 40 ) of the seat arm. Chair according to one of the preceding claims, wherein the synchronization mechanism as a whole in each case mirror-symmetrically to both sides of the seat surface ( 3 ) is arranged. Chair according to claim 20, wherein the armrests ( 33 ) and the backrest ( 5 ) than in the backrest carrier ( 37 ) are pluggable.