WO2012104024A1

WO2012104024A1 - Synchronizing mechanism

Info

Publication number: WO2012104024A1
Application number: PCT/EP2012/000247
Authority: WO
Inventors: Hermann Bock
Original assignee: Bock 1 Gmbh & Co. Kg
Priority date: 2011-02-01
Filing date: 2012-01-20
Publication date: 2012-08-09
Also published as: EP2670279A1; US20130320732A1; CN103338681B; EP2670279B1; DE102011010099A1; CN103338681A

Abstract

The invention relates to a synchronizing mechanism for a correlated seat and backrest movement of an office chair, having a base support (1) which can be placed onto a chair column, a seat support (3) and a backrest support (4). In order to provide a synchronizing mechanism which is of particularly simple design structurally, it is proposed that the seat support (3) is coupled directly to a first swivel bearing (27) of the base support (1), that the backrest support (4) is directly coupled to a second swivel bearing (28) of the base support (1), that the backrest support (4) is connected to the seat support (3) via a joint (16), and that the joint axis (22) of the joint (16) is arranged, as seen in the longitudinal direction (14) of the seat, upstream of the swivel axis (15) of the second swivel bearing (28) in such a manner that a swivelling movement (7) of the backrest to the rear about the swivel axis (15) of the second swivel bearing (28) induces rotation of the seat support (3) about the swivel axis (13) of the first swivel bearing (27) and therefore a raising movement (23) exclusively of the front region (9) of the seat support (3).

Description

description

Synchronous Mechanics The invention relates to a synchronous mechanism for a

correlated seat-backrest movement of an office chair, with a base carrier placeable on a chair column, a seat carrier and a backrest support. The term "synchronous mechanism" is understood to mean assemblies in the seat substructure of an office chair which provide kinematics which are coupled to one another and provide a specific relative movement of the seat and backrest The backrest support, which extends in the usual way from the actual synchronous mechanism to the rear, carries on an upwardly extending boom the

Backrest of the office chair. Seat carrier and

Backrest supports are usually so articulated

coupled, that a pivoting movement of the backrest to the rear - as for example by leaning of the

Chair user can be caused to the backrest - induced a lowering movement of the rear edge of the seat down.

For a comfortable use of the chair it is from

Advantage, if the pivoting resistance of the backrest can be adjusted depending on the weight of the user. To change the pivoting resistance of the backrest, such synchronizing mechanisms usually have a more or less complex spring arrangement for preloading the synchronizing mechanism.

CONFIRMATION COPY An object of the present invention is to provide a

Provide synchronous mechanism, which is structurally particularly simple and therefore inexpensive to produce and yet the ease of use of a conventional

Synchronous mechanism provides. In particular, the synchronous mechanism should not or only a few or weak

Need spring elements. This object is achieved by a synchronous mechanism according to claim 1. Advantageous embodiments of the invention are specified in the subclaims.

According to the invention it is provided that the seat support

directly, d. H. directly and without using one

Coupling element, such as a handlebar or the like, hingedly connected to the base support, wherein at the same time

the directly connected to the base support, namely pivotable about a transverse axis on the base support

Backrest support hingedly connected to the seat support is such that a pivoting movement of the backrest to the rear induces a lifting movement of the front portion of the seat support. A basic idea of the invention is that the user of the office chair by a burden of

Backrest lifts itself upwards. In other words, the user works while pressing the synchronous mechanism by pushing back the back against his own, resting on the seat weight. The desired

Pivoting resistance is thus virtually automatic due to the weight of the user. Known from the prior art spring arrangements for adjusting the Swinging resistance (eg in the form of several parallel-connected compression or tension springs) and consuming

Adjustment mechanisms (worm gears, gears,

Threaded rods, etc.) are not required. This considerably reduces the manufacturing costs of the synchronous mechanism. At the same time, the reliability increases.

The lever geometry required for the "self-adjusting" mechanism of the present invention is achieved by arranging the pivot axis of the backrest support connection with the base support in the seat longitudinal direction behind the articulation axis of the connection of the backrest support to the seat support are particularly low because both the backrest support with the base support, and the seat support with the base support directly, ie directly and without the interposition of an additional component, is articulated.

Due to the constructive arrangement of the components, the front region of the seat support is raised during a pivoting of the backrest. This increases the distance between the front portion of the seat support and the

Base carrier, while the rear portion of the seat carrier remains firmly connected to the base carrier. There is thus a tilting of the seat to the rear about the pivot axis of the

Seat carrier base carrier connection in a defined

Relationship to the movement of the backrest. This gives the desired synchronizing effect, in which the angle of the seat support to the backrest support changes. The user's weight directly affects the swing resistance felt by the user. A lighter one

User has to overcome a significantly lower swing resistance when pivoting than a heavy user.

Subjectively, the same results for each user

"Felt" resistance when pivoting the backrest.

Due to the arrangement of the pivot bearing and joints and their configuration, the synchronous movement of the seat support can be adjusted individually to the requirements imposed on the chair. Thus, for example, by changing the distance between the Schenklagern or joints

adjustable, how strong the seat carrier is at a

Pivoting the backrest tends. Compared with those known from the prior art

Solutions according to the invention a structurally comparatively simple pivot mechanism presented in which the

so-called "shirt extraction effect" is significantly reduced.

In other words, a particularly high level of comfort is achieved, without having to resort to more expensive and expensive solutions.

Compared to other already known "self-adjusting" mechanics, the present synchronous mechanism is characterized by the fact that it is particularly flat, so that a corresponding assembly requires very little space.

At the same time, the mechanics are extremely simple. The desired synchronous movement can with the three known

Components backrest support, base support and seat support can be realized, which with the help of only three

Anlenkpunkten are interconnected. An embodiment of the invention will be explained below with reference to the drawings. Hereby show:

Fig. 1 is a side view of the synchronous mechanism in the

Basic position, and

Fig. 2 is a side view of the synchronous mechanism in one

Backwards pivoted position. All figures show the synchronous mechanism only schematically and with the essential for the invention

Ingredients. The same reference numerals correspond

Elements of equal or comparable function. The synchronous mechanism has a base support 1, which by means of a cone seat 2 on the upper end of a

Chair column (not shown) is set. In addition, the synchronous mechanism comprises a substantially

frame-shaped seat support 3 and a plan view

fork-shaped backrest support 4, whose cheeks 5 are arranged on both sides of the base support 1. The seat support 3 is provided for receiving or mounting a preferably padded seat (not shown). The assembly is done using not shown fasteners in the usual way. On the backrest support 4, a backrest, not shown, is attached, which is height adjustable in modern office chairs. The backrest can also be integrally connected to the backrest support 4. The entire synchronous mechanism is with respect to

Middle longitudinal plane, as far as the actual kinematics is concerned, constructed mirror-symmetrically. In that regard, in the following description is always present on both sides in pairs Design elements of the actual swing mechanism go out.

In Fig. 1, the basic position is shown, in which the seat support 3 is arranged substantially horizontally. Fig. 2 shows the synchronous mechanism in a rearward

pivoted position of the backrest support 4. The front portion of the seat support 3 is raised. The rear portion 25 of the seat support 3 is articulated directly to the base support, with the aid of a

Bearing 6 at a first pivot bearing 27 of the

Base carrier 1. The seat support 3 can thus by a

transverse pivot axis 13 are pivoted. to

Formation of the Schenklager 27 in the region of the base support 1, first MontageSchenkel 12 of the seat support 3 extend from the support plate 11 of the seat support 3 down in

Direction base support 1. Since the pivot bearing 27 is disposed at the rear end 9 of the base support 1, can also

Seat support 3 and / or seats are pivoted undisturbed, which protrude beyond the trailing edge of the base support 1, without requiring special and expensive constructive measures for this purpose. The backrest support 4 is in a direction with

Sitzvorderkante 8 extending cheek 5 with the help of a

Bearing 6 at a second pivot bearing 28 of the

Base carrier 1 hinged directly. The backrest support 4 can thus move about a transverse pivot axis 15 from the home position to a pivoted-back position. The second pivot bearing 28 is located in

Seat longitudinal direction 14 seen approximately in the middle of the

Base carrier 1, and immediately before the Konusaufnahme 2. The backrest support 4 is also connected to the seat support 3 directly articulated, more specifically, with second mounting giftsIn 19 of the seat support 3, extending from the support plate 11 of the seat support 3 down in

Direction base plate 1 extend. An arranged in these second mounting legs 19 slot 20 forms together with a at the front end of the cheek 5 of the

Backrest support 4 fastened pin 10 a rotary-sliding joint 16. Backrest support 4 and seat support 3 are thus pivotable about a transverse hinge axis 22 and at the same time slidably connected to each other in the seat longitudinal direction 14. In addition to a rotational movement is in other words by the joint 16 at the same time also one

Translational movement possible. This is necessary to prevent locking of the seat support 3, because the

Trajectory of the backrest support 4 to the second

Swivel axis 15 deviates from the movement path of the seat support 3 about the first pivot axis 13.

Defined by the articulation of the backrest support 4 on the base support 1 second pivot axis 15 is in

Seat longitudinal direction 14 seen behind the defined by the articulation of the backrest support 4 on the seat support 3 hinge axis 22 so that a pivotal movement of the backrest in the pivoting direction 7 about the Schwe kachse 15 of the second pivot bearing 28 to the rear rotation of the

Seat support 3 about the pivot axis 13 of the first pivot bearing 27 and thus a lifting movement 23 exclusively of the front portion 26 of the seat support 3 induced. The rear portion 25 of the seat support 3 is not

raised. A behind the pivot axis 13 lying part of the seat (not shown) is lowered. In other words, by pivoting the backrest to the rear bottom of the seat support 3 in

Pivoting direction 7 taken and raised due to the lever assembly formed by the cheek 5 of the backrest support 4. The positions of the articulation points 15, 22 of the

Backrest support 4 on the base support 1 on the one hand and on the seat support 3 on the other hand according to the invention define a lever element as an integral part of the front

Area of the cheek 5 of the backrest support 4th

The distances between the first pivot axis 13 and the second pivot axis 15 and between the second 15th

Swivel axis and the hinge axis 22 define that

Synchronous ratio of the mechanism, i. the

Transmission ratio of Rückenlehnenträgerschwenkwinkel 29 to Sitzträgerschwenkwinkel 30. The selected axis arrangement determines the lever geometry of the mechanism and determines the manner in which the seat support 3 lifts and moves synchronously to the pivoted backrest.

In the embodiment shown in the figures, the first pivot axis 13 and the hinge axis 22 are in the non-pivoted basic position essentially at a height, while the second pivot axis 15 is arranged only slightly higher. The distance 17 is in the example only 2 mm. This results u.a. a very

flat construction. The distance 31 from the first pivot axis 13 to the second pivot axis 15 is in a particularly advantageous embodiment 107 mm and the distance 32 from the first

Pivot axis 13 to the hinge axis 22 is 137 mm. Also in a maximum rearward pivoted position of the

Synchronous mechanism, the order of arrangement of the axes 13, 15, 22 does not change. By arranging the first pivot axis 13 at the rear end 9 of the base support 1, a comparatively large distance 31, 32 to the second pivot axis 15 or to the hinge axis 22 can be produced in a structurally particularly simple manner, which is a particularly advantageous

Synchronous ratio results in which a very far

Pivoting the backrest support 4 to the rear causes only a slight lifting of the front edge 8 of the seat support 3. As a particularly advantageous embodiment has proven in which the inclination 30 of the seat support 3 to the horizontal starting position is about 5.5 °, when the backrest support 4 a waste 29 of about 25 ° back down

having. In the pivoted state, the vertical distance 33 between the second pivot axis 15 and the

Joint axis 22 in the example shown in Fig. 2 11 mm.

The position of the axes 13, 15, 22 causes the

Total pivot point of the mechanism at the beginning of the pivoting movement of the backrest almost matches the actual pivot point of the chair user. This results in a particularly comfortable movement and the occurrence of negative effects, such as the so-called

Shirt pull-out effect, can be avoided.

In the present case, an approximately linear

Mechanical characteristic achieved, in which the swivel resistance over the entire movement is approximately constant. In this case, the seat support 3 only in the front region 26th lifted, which supports the intuitive human motion sequence when pivoting backwards.

By the described pivot mechanism is

ensures that the backrest support 4 with the

Backrest about a pivot axis, here the second

Swivel axis 15, in the pivoting direction 7 can be pivoted. At the same time, the pivotal movement of the backrest to the rear induces a lifting movement 23 of the front region 26 of the seat support 3. When the backrest is pivoted backwards downwards, there is no displacement of the backrest

Seat support 3 in the seat longitudinal direction 14 forward or backward. The seat support 3 performs only one

Pivoting movement about the first pivot axis 13, while the base support 1 with its two pivot bearings 27, 28th

remains fixed in position.

To support or influence the pivoting resistance and to prevent the backrest tilts uncontrollably backwards and for a safe retrieval of

Backrest from the pivoted position in the

Basic position, as soon as the user of the backrest is no longer charged, serves a spring arrangement with one or more spring elements. For example, this is a spring 21 arranged in the region of the front base support 18, which is supported on the one hand on the base support 1 and on the other hand on the cheek 5 of the backrest support 4, and which is loaded when the backrest support 4 is pivoted. The spring element 21 need only be made comparatively weak, so that a total of the components of the

Mechanics only small spring forces act, resulting in a

compared to conventional mechanics significantly reduced stress on the components results. The illustrated in Figs. 1 and 2 embodiment, in which a) the backrest support 4 with the base support. 1

is exclusively connected via a single direct connection in the form of a pivot bearing 28, b) the backrest support 4 with the seat support. 3

exclusively connected via a single direct connection in the form of a joint 16, and c) the seat support 3 is connected to the base support 1 exclusively via a single direct connection, namely a further pivot bearing 13, and via an indirect connection, wherein the indirect connection by the

Backrest support 4 is made, which is connected on the one hand with the seat support 3 via the joint 16 and on the other hand with the base support 1 via the pivot bearing 15, is particularly advantageous, because thus the desired

Synchronous movement can be realized with very few components. Alternatively, it is also possible, instead of the integrated in the backrest support 4 joint 16 for

Connection of the backrest support 4 to the seat support 3 to use one or more coupling elements, which are hinged on the one hand to the backrest support 4 and on the other hand to the seat support 3. As a result, the number of axes would increase to four, which provides further opportunities for

Design of the synchronous movement result. At the same time, however, the basic structure of the mechanism with the o.g.

Characteristics, in particular the principle of leverage and the manner of movement of the seat support 3, received. All features illustrated in the description, the following claims and the drawings can be used individually as well as in any combination with one another

be essential to the invention.

LIST OF REFERENCE NUMBERS

1 base carrier

2 cone recording

3 seat support

4 backrest support

5 cheek

6 journals

7 pivoting direction

8 seat leading edge

9 back base station end

10 cones

11 carrier plate

12 first mounting leg

13 first pivot axis

14 seat longitudinal direction

15 second pivot axis

16 rotary sliding joint

17 distance

18 front base station end

19 second mounting legs

20 slot

21 spring

22 joint axis

23 lifting movement

24 (free)

25 rear area of the seat support

26 front area of the Sitzträqers first pivot bearing

second pivot bearing

Swivel angle of the backrest carrier Swivel angle of the seat carrier

distance

Claims

claims

1. synchronous mechanism for a correlated seat backrest movement of an office chair, with a base support (1) placeable on a chair column, a seat support (3) and a backrest support (4),

- wherein the seat support (3) on a first pivot bearing (27) of the base support (1) is articulated directly,

- wherein the backrest support (4) on a second

Swivel bearing (28) of the base support (1) is articulated directly, - wherein the backrest support (4) via a hinge (16) with the seat support (3) is connected, and

- Wherein the hinge axis (22) of the joint (16) in

Seat longitudinal direction (14) seen in front of the pivot axis (15) of the second pivot bearing (28) is arranged such that a pivoting movement (7) of the backrest about the pivot axis (15) of the second pivot bearing (28) to the rear rotation of the seat support (3) about the pivot axis (13) of the first

Swing bearing (27) and thus a lifting movement (23) of the front portion (26) of the seat support (3) induced.

2. synchronizing mechanism according to claim 1, wherein the

Backrest support (4) via the joint (16) is directly connected to the seat support (3).

3. Synchronous mechanism according to claim 1 or 2, wherein it is the hinge (16) is a rotary-sliding joint.

4. synchronizing mechanism according to one of claims 1 to 3, wherein the first pivot bearing (13) at the rear end (9) of the

Base carrier (1) is arranged.