DE3322450A1 - Device for adjusting the seat and the backrest of chairs - Google Patents

Abstract

A chair, having a seat (17) and a separate backrest (24), has a bearing arm (22) which is linked with its forwardly bent lower end (21) by a transverse axle (20) below the seat to a bearing part (16) supported on the floor. The backrest (24) is firmly connected to the upright upper end (23) of the bearing arm (22). The rear end (19) of the seat (17) is linked to the bearing arm (22) by a transverse axle (25) in a central region of said bearing arm. A horizontal sliding guide (28) is provided between the seat (17) and the bearing part (16) in the front region of the seat. Said guide allows the seat to be pushed back counter to the prestressing force of a spring (36) and allows limited pivoting movement of the seat (17) about a transverse axle (31) provided in the region of the sliding guide (28). Consequently, by pushing the seat (17) back, the backrest (24) can be tilted towards the rear without uncomfortable relative movements taking place between the adjacent edges of the seat (17) and the backrest (24). The respectively desired setting can be fixed by means of a blocking device. <IMAGE>

Description

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PATENT ADVOCATE, DIPL.-ING. GERD UTERMANN

71 HEILBRONN. PO Box 3525. CABLE: PATU. TEL. (07131) 82828

Kilianstrasse 7 (Kilianspassage) BW-Bank Heilbronn: 701 17106 00 (BLZ 620 300 50) Postscheck Stuttgart: 43016-704

Patent and utility model auxiliary application 'P 7. 32 D ^ 9

June 21, 83 / 1M

Applicant: Company

August Proseher GmbH & Co. K.G.

Bahnhofstrasse 13
P.O. Box 151

D-7141 Steinheim

Designation: Device for adjusting the seat and

the back of chairs

Description:

The invention relates to a device for adjusting the seat and the backrest of chairs, in particular office chairs, with a support part arranged on a support, a seat mounted movably on this and a seat movable backrest that is coupled with the seat on both sides. . Movements connected, being of the backrest extends from at least one support arm projecting beyond the lower edge of the backrest, its forwardly bent arm the lower end is hinged below the seat in the area of the support on the support part.

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Such a device is already known (EP-OS ^ 9 310). The seat is in its front area on the Support part hinged, while the backrest is hinged in a central area to the upper end of the support arm. The seat and backrest merge into an arched, bendable intermediate part. The deformability of this intermediate part allows a limited pivoting of the support arm, so that the backrest by appropriate body pressure can be tilted backwards or moved back to a substantially vertical position. As a result of the movement coupling, the rear edge of the seat is lowered slightly, when the backrest is tilted backwards.

In the known chair is achieved by the one-piece connection of the seat and backrest that when adjusting no major relative movements take place between the rear end of the seat and the lower end of the backrest. Such relative movements that intensify when adjusting of chairs where the seat and backrest are separate parts, but lead to a so-called pull-out effect as a result of a sliding movement that occurs. However, connecting the seat and backrest does not completely eliminate this effect, as the transition area between seat and backrest in the interest

^ - ^ the required deformability even in tilted back Position is still angled by about 90, so that at this Unlike a one-piece bucket seat, there is no body contact that would allow relative movement between shirt and pants. Thus, despite the comparatively complex one-piece design the shirt pulling effect is not completely avoided and no body support in the transition area between the The seat and the backrest. Finally, it is also to be regarded as a disadvantage that the pivot point of the seat is already arranged on the supporting part at such a distance behind the front seat edge and under the seat surface, that the adjustment already results in a noticeable lifting or

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Lowering the front edge of the seat leads to the pressure the lower edge of the thighs increased significantly. It is therefore generally true that the movement coupling between the seat and Backrest does not meet the requirements, as well as the latest ergonomic knowledge - even Pressure distribution without sliding effect on clothing and skin - taking into account adjustment of both the backrest how the seat leads.

The invention is based on the object of designing a chair of the type mentioned in such a way that with simpler Training of the adjustment mechanism with few individual parts an adjustment largely corresponding to the requirements both the backrest and the seat is achieved without a sliding or shirt pulling effect or pinching must be accepted at the rear edge of the seat.

This object is achieved in that the Seat mounted in its front area so that it can be displaced essentially horizontally on the support part and by means of a spring is biased in its front position that the backrest is designed as a separate part from the seat and firmly with is connected to the support arm and that the seat is articulated in the region of its rear edge on the support arm.

In this embodiment, the spring biases the seat in its front position and thus the backrest in the substantially vertical, not tilted backwards position. The user can push the seat backwards from this position against the spring force, whereby the front support the thigh remains approximately at the same height, which is desirable. Already a slight shift of the seat to the rear leads to a pivoting of the support arm around its articulation point on the support part, so that the backrest, which is firmly connected to the support arm, moves backwards in a certain ratio to it tends. In doing so, the rear end of the

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steered seat a limited downward movement, which by a corresponding pivotability of the support part sliding seat is made possible. These coupling movements of the seat and backrest correspond to the latest ergonomic knowledge. The articulation of the seat on the support arm and thus on the backrest creates a Sliding movement between these parts excluded, so that the annoying sliding and shirt pulling effect is avoided will. There is also no risk of entrapment. Because the seat is pushed back against the spring force takes place, the sliding movement can be used directly for elastic force support. The Mechanics mean that the user is constantly rocking the chair back and forth. This movement is called "dynamic." Sitting "of work physiology. Finally, it is readily apparent that the training according to the invention consists of a few individual parts that do not require any special effort, and that no premature wear of parts of the adjustment mechanism is to be feared.

The rear edge of the seat can be arranged at a distance from the backrest. In this way, the for the respective adjustment movement of the seat and backrest, the relevant articulation point of the seat on the support arm accordingly the ergonomic requirements can be selected without the seat and / or the backrest in their training special position of the pivot point must be adapted. In particular, the distance between the seat and the backrest can be provided without the effect of sliding or pulling your shirt off or fear of entrapment are.

In an advantageous embodiment, the seat is over a sliding guide made up of at least one guide slot and a guide pin received in this with the Support part connected. In this case, the slight pivoting of the seat required for the adjustment is

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Axis of the guide pin even with tight guide play of the Sliding guidance guaranteed.

It has proven advantageous to have the seat above to be linked to the seat surface level on the support arm. This results in there is a favorable relationship between the respective positions of the seat and backrest, which are coupled to one another.

In an expedient embodiment, the force is the The spring biasing the seat into its forward position is adjustable via an actuating device. In this The adjustment force to be applied can be adjusted individually be adapted to the body weight.

In a further development, there is a blocking device for securing the seat within its adjustment range intended. Thus, the chair can be in an intermediate position of seat and backrest that is perceived as pleasant by the user can be determined so that the seat and backrest are neither under the action of the spring in the starting position with a substantially vertical backrest still go back into one by a force applied by the user further back tilted position can be adjusted. The blocking device thus prevents any possibility of rocking.

It has proven to be useful to dimension the adjustment range of the seat and the articulation point between the seat and the support arm to be arranged so that the backrest with simultaneous rearward displacement of the seat movable from a substantially vertical position to a position inclined to the rear by about 15 to 30 is. This inclination range of the backrest corresponds to a displacement distance of the seat, which is through a front and a rear stop can be limited.

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The movements of the seat and the backrest are preferably coupled to one another in such a way that when tilting backwards the backrest of the seat tilts backwards by about 5 to 15 °.

The spring for pretensioning the seat is expediently arranged horizontally. In this case, the With a compact design, place the spring well below the seat. In addition, the force of the spring, for example a coil spring, fully used to counteract the horizontal sliding back of the seat or to preload the seat in its forward position.

An exemplary embodiment of the invention is explained in more detail below with reference to the schematic drawing. It shows:

1 shows a side view of the chair in the starting position with an essentially vertical backrest, the end position with the backrest fully tilted back is indicated by dashed lines;

Fig. 2 is a view of the chair from below, the chair foot is omitted;

3 shows an enlarged detail from FIG. 1 and FIG

Fig. H a figure 3 corresponding with presentation of the initial position into the tilted end position displaced parts.

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The chair has a base 10 which is supported by glides or castors 11 on the floor. A column 12 protrudes from the center of the pedestal 10 and, together with a pipe section 13 that extends over the upper end of the column 12, forms a vertical support 14. As a result of the two-part design of the support Ik , its length can be adjusted in a known manner and it can be cushioned by a spring accommodated in the pipe section 13.

A support part connects to the upper end of the pipe section 13 16, which extends in relation to the vertical column axis 15 substantially to the front. On the Support part 16 is a substantially horizontal seat with a downwardly bent front end 18 and one rear end 19 bent upwardly supported.

Below the seat 17, at the rear upper end of the support part 16 near the support axis 15, a transverse axis 20 is attached to the support part 16, on which the forwardly bent lower end 21 of a support arm 22 is pivotably mounted. The support arm 22 extends essentially in the vertical longitudinal center plane and has an essentially vertical upper end 23 to which the backrest 2k is firmly connected. The support arm 22 is provided in its central area at a small distance above its bend or bend with a transverse axis 25, on which the seat 17 is supported by means of two straps 26 and, which protrude from the rear end 19 of the seat I7 to the rear and the support arm 22 overlap on opposite sides. Instead of the single support arm 22 shown, two support arms could also be provided, which are arranged on opposite sides of the longitudinal center plane and run parallel to it.

As can be seen most clearly from FIGS. 3 and k , the seat 17 is horizontally displaced via a sliding guide 28.

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slidably mounted on the support part i6. The sliding guide 28 is connected by two horizontal guide slots 29 in. two longitudinal webs 30 arranged at a transverse distance from one another the underside of the seat 17 (see. Fig. 2) and through two coaxial guide pins 31 are formed, each engage in one of the two guide slots 29 and over laterally projecting support pieces 32 with the front end of the Support part 16 are connected. The sliding guide 28 not only enables an essentially horizontal displacement of the seat 17 on the support part 16 but at the same time a Pivoting of the seat 17 about the pivot axis 33 formed by the two guide pins 31

A transverse plate 3 ^ protrudes from the seat 17, opposite which a support plate 35 provided on the support part 16 lies opposite. The rear end of an essentially horizontally arranged spring 36 is supported on this support plate 35, which spring is designed, for example, as a helical spring and / or as an elastic spring block. Axially through the spring 36, a clamping pin 37 extending along the axis of the spring 36 extends rearward through bores in the support plate and the transverse plate 3h and is secured at its rear end by a transverse pin 38 against sliding out of the transverse plate 3 ^. The spring 36 is shielded on its underside by an extension 39 on the support part 16. An actuating device hO in the form of a screw button provided with grip projections hl , on which the front end of the spring 36 is supported, is screwed onto the threaded front end of the dowel pin 37.

Thus, the spring 36 tries to pull the transverse plate 3h of the seat 17 to the support plate 35 of the support part 16 and to bias the seat 17 into its front position or starting position shown in Fig. 3, in which the guide pins 31 at the rear end of the guide slots

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attacks. The pretensioning force of the spring j6 can be adjusted by means of the actuating device 40. In this starting position, the backrest 24 assumes an essentially vertical position, as shown in FIG. 1 with solid lines.

A gas spring locking member as indicated by dashed lines only in Figure 2 · behind the spring 36 additionally arranged 45 of known type, whose cylinder 46 is connected to a transverse axis of rotation 49 whose ends are received in Drehachsführungen 47 and 48th The Drehachsführungen 47 and 48 are n on the support part 16 between guide surfaces 50 and 5I ^a. The underside of the seat 17 is formed. The piston rod 52 of the gas spring locking element 45, which protrudes to the rear from the cylinder 46, is supported with its rear end on the transverse axis 20.

The gas spring locking element 45 thus carries like that Spring 36 contributes to cushioning and causes damping the adjustment movements of the seat 17 · It also enables a fixing of the seat 17 in any position, including a locking lever 53 with one below the seat 17 actuating button 54 exposed near its side edge is provided.

If the backrest is to be inclined or tilted backwards, as shown in dashed lines in FIG. 1, then by shifting the body's center of gravity, i.e. shifting the upper body backwards, the seat 17 is opposed to the user the pretensioning force of the spring 36 pushed backwards, which is a shift from the starting position shown in FIG. 3 in the direction of the end position according to FIG. 4 is equivalent to. The sliding movement of the seat 17 is made essentially horizontal by the action acting on the backrest 24 Transfer the pressure exerted by the leaning back upper body via the support arm 22 to the transverse axis 25,

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wherein the transverse axis 25 pivots along the circular arc * 42 about the transverse axis 20 on the support part 16. This pivoting movement is made possible by the fact that the guide pins 31 can rotate in the guide slots 29. The seat 17 experiences a lowering at its rear end, which is preferably between 5 and 15, as FIG. K shows. Since the pivot point of the seat 17 lies in its front area, the front end 18 of the seat is raised only insignificantly, which can be seen from FIG. 1 (dashed illustration). When the support arm 22 is pivoted down about the transverse axis 20, the backrest 2k is inclined more strongly. The adjusting movement is stopped as soon as the guide pins k ansohlagen 31 according to FIG. At the front end of the guide slots 29. In this from Fig. K ersehenden end position, the back rest has been pivoted 2k with respect to the initial position in Fig. 3 by an "angle backwards, the amounts preferably between 15 and 30 in Fig. 3, the end position is kj of the transverse axis 25 during the downward pivoting along the arc indicated k2, k during the initial position is indicated kk in Fig. correspondingly.

From the comparison of FIGS. 3 and k it can also be seen that the gap between the upper or rear end 19 of the seat 17 and the lower end of the backrest 2k practically neither increases nor decreases when changing from the starting position to the end position and vice versa . Therefore, the seat 17 and the backrest 2k may bear substantially over their entire length supporting the body of the chair the person using it, without it when ^': ί or adjustment to the known sliding and Hemdauszieheffekten even to jamming between the seat 17 and backrest j

2k is coming. !

If the user does not feel comfortable by shifting his weight or resting his foot on the floor in a more or less

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wants to hold the backward inclined position against the biasing force of the spring 36 and wants to forego a possible rocking movement in play with the spring 36, the perceived as suitable position of the seat I7 and the backrest 2.h must be determined. This is done by acting on the gas spring locking element k5 by means of the locking lever 53. If necessary, another type of locking can also be provided, which can take place hydraulically, pneumatically or mechanically.

PATENTANWALT-ütPL .'- fN-G. "G-ERD UTER MAN N 71 HEILBRONN. POST BOX 3525. CABLE: PATU, TEL. (07131) 82828

Kilianstrasse 7 (Kilianspassage) BW-Bank Heilbronn: 701 17106 00 (BLZ 620 300 50) Postscheck Stuttgart: 43016-704

Patent and utility model auxiliary application P 7. 32 D 49

June 21, 83 / lM

Applicant:

Description:

company

August Fröscher GmbH & Co. K.G.

Bahnhofstrasse 13 P.O. Box 151

D-7141 Steinheim

Device for adjusting the seat and backrest of chairs

List of reference symbols:

10 base frame

11 castors

12 pillar

13 Pipe section 1A support

15 support axis

16 support part

17 seat

18 front end (of 17)

19 rear end (of 17)

20 transverse axis

21 lower end (of 22)

22 support arm

23 top end (of 22) 2k backrest

25 transverse axis

26 tab

27 tab

28 sliding guide

29 guide slots

30 longitudinal bars

31 guide pins

32 carrying pieces

33 swivel axis
^ h transverse plate

35 support plate

36 spring

37 roll pin

38 cross pin

39 appendix

hO actuating device k '\ handle projections h2 circular arc

^ 3 end position

kk Initial position k-5 Gas spring locking element ^ 6 cylinders

^ 7 Rotary axis guide 48 Rotary axis guide ^ 9 axis of rotation

50 guide surface (at 17)

51 guide surface (at 17)

52 piston rod

53 Locking lever 5 ^ control button

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Claims (1)

PATENTANWALT-.DH-PIL -.- ΓΝ "G." ^Ss: E * RD UTERMANN 71 HEILBRONN. PO Box 3525. CABLE: PATU. TEL. (07131) 82828 Kilianstrasse 7 (Kilianspassage) BW-Bank Heilbronn: 701 17106 00 (BLZ 620 300 50) Postscheck Stuttgart: 43016-704 Patent and utility model auxiliary application F 7. 32 D 49 June 21, 83 / 1M Applicant: Company August Fröscher GmbH & Co. K.G. Bahnhofstrasse 13
P.O. Box 151 D-7141 Steinheim Designation: Device for adjusting the seat and the back of chairs Expectations: I.j Device for adjusting the seat and backrest of chairs, in particular office chairs, with a support part (16) arranged on a support (14), a on this movably mounted seat (17) and a moveable backrest (24), which with the seat (17) below Coupling of the mutual movements is connected, with at least one of the backrest (24) via the Backrest lower edge protruding support arm (22) goes out, its forwardly bent lower end (21) below of the seat (17) is articulated on the support part (16) in the region of the support (14), characterized in that that the seat (17) is substantially horizontally displaceable in its front region mounted on the support part (i6) and biased by means of a spring (36) in its front position that the The backrest (24) is designed as a separate part from the seat (17) and is firmly connected to the support arm (22) and that the seat (17) is articulated on the support arm (22) in the region of its rear edge (19). 2. Apparatus according to claim 1, characterized in that the rear edge (19) of the seat (17) is arranged at a distance from the backrest {2k) . 3. Apparatus according to claim 1 or 2, characterized in that the seat (17) via a sliding guide (28) at least one guide slot (29) and a guide pin (31) received in this with the Support part (16) is connected. k, Device according to one of Claims 1 to 3i, characterized in that the seat (17) is articulated on the support arm (22) above the plane of the seat surface. 5. Device according to one of claims 1 to U, characterized in that the force of the seat (17) in its front Position of the pretensioning spring (36) via an actuating device (* K)) is adjustable. 6. Device according to one of claims 1 to 5 »characterized in that that a blocking device (^ 5) for locking of the seat (17) is provided within its adjustment range. 7. Device according to one of claims 1 to 6, characterized in that the adjustment range of the seat (17) and the articulation point (25) between the seat (17) and the Support arm (22) ao is arranged that the backrest (24) with simultaneous rearward displacement of the Seat (17) from a substantially vertical position to a position by about 15 to 30 to the rear inclined position is movable. • / 3 F 7. 32 D 49 8, device according to claim 7 »characterized in that the movements of the seat (17) and the backrest (2 ^) are coupled to one another in such a way that when the backrest (2k) is tilted backwards, the seat (17) moves by about 5 ° to 15 ° ° tilts backwards. 9. Device according to one of claims 1 to 8, characterized in that the spring (36) ^for biasing the seat (17) is arranged horizontally.