WO2008064673A1

WO2008064673A1 - Backrest for a chair, and chair comprising the same

Info

Publication number: WO2008064673A1
Application number: PCT/DE2007/075008
Authority: WO
Inventors: Martin Ballendat
Original assignee: Dauphin Entwicklungs- Und Beteiligungs Gmbh
Priority date: 2006-10-16
Filing date: 2007-10-10
Publication date: 2008-06-05
Also published as: EP2079344B1; ATE491370T1; EP2079344A1; DE502007005985D1; US20100117421A1; DE202006015822U1; DE112007003142A5; TW200836672A

Abstract

The invention relates to a backrest for a chair, comprising: an external backrest frame (1) that has two backrest frame legs (11, 12); an internal (H-shaped) stretching frame (4) that has two lateral stretching frame legs (41, 42) between which a flexible covering (44) and an extensible and compressible (convex) stretching frame transversal connection (43) are arranged; and at least one hand wheel (6a, 6b) that is disposed externally on a backrest frame leg (11, 12) and is fitted with a threaded bar (61) which extends through the backrest frame leg (11, 12). Said threaded bar (61) allows the adjacent stretching frame leg (41, 42) to be pulled closer such that the stretching frame transversal connection (43) is extended and the flexible covering (44) is stretched while allowing the adjacent stretching frame leg (41, 42) to be moved away such that the stretching frame transversal connection (43) is compressed and the flexible covering (44) is slackened.

Description

description

Chair back and chair hereby

The invention relates to a chair back and a chair with such a chair back.

Swivel chairs with a two-part back surface, divided into a lumbar support area and an upper back area, are known in the prior art.

Such swivel chairs are not satisfactorily adjustable on the seat and allow only a few different seating positions.

It is therefore an object of the present invention to provide a better on the

Sitting adjustable chair back and specify a chair with such a chair back.

This object is solved by the subject matter of the independent patent claims. Advantageous further developments emerge from the dependent claims.

An inventive chair back comprises an outer chair back frame with two chair back frame legs and an inner, in particular H-shaped clamping frame with two lateral clamping frame legs between which a flexible Bespan- tion and an expandable and compressible clamping frame cross-connection is arranged, in particular to the rear may be formed convex, and it allows the tenter legs can be resiliently together and pushed apart in the lateral direction. Furthermore, the chair back comprises at least one, preferably two hand wheels arranged on the outside of a chair back frame leg with a threaded rod extending through the chair back frame leg. By the handwheel of each adjacent clamping frame leg can be used so that the clamping frame cross-connection is pulled apart and the flexible fabric is stretched and also can by the handwheel adjacent tenter leg are moved away, so that the clamping frame cross-connection is compressed and the flexible fabric is loosened.

According to one aspect of the invention, the voltage of the flexible tension of the inner clamping frame, which is particularly suitable for lordosis area, can be adjusted flexibly, so that the tenter optimally adapts to the flexible ends of the seat, especially at the back. Such a chair back with a flexibly adjustable cover provides a high level of comfort, can also be easily manufactured and is very reliable.

According to a first embodiment of the invention, the threaded rod engages the at least one handwheel in a arranged on or in a side clamping frame leg locknut, in particular in a threaded probe with locknut and thus effected in a simple yet effective manner, the variation of the voltage of the flexible covering. It is advantageous if the lock nut is fixed with respect to the clamping frame leg, which can be achieved in a simple manner, when the locknut has a cross-clamping bolt which is located in a mounted on the inside of the tenter leg recess.

According to a further embodiment of the invention, a tilt bearing of the inner clamping frame is provided by the inner clamping frame is pivotally mounted with respect to the outer chair back frame. It is advantageous if the at least one handwheel is located axially on the tilting bearing of the inner clamping frame outside the backrest. It is particularly advantageous if two handwheels are provided, which are located axially on the tilting mounting of the tentering frame on the right and left outside of the backrest.

According to a further basic idea of the invention, by providing such a tilting support for the inner clamping frame, the seating comfort can be further increased by additionally adapting the flexible covering of the clamping frame with respect to the inclination points on the back. Thus, the flexible covering of the clamping frame on the one hand with regard to the deformation due to the flexible covering and other- on the other hand optimally adapt to the back in terms of their inclination due to the tiltable storage and provide increased ergonomics and a further improved seating comfort.

According to a further advantageous embodiment of the invention, the tilting bearing is achieved in that at least one, preferably two radial longitudinal recesses are formed in the chair back frame legs, in which run at least one, preferably two guide pins or guide screws, which are connected to the adjacent tenter leg , These radial Längsausnehmungen allow the pivoting movement of the clamping frame. Furthermore, the ends of the radial Längsausnehmungen form stops for the at least one, preferably for the two guide pins or guide screws and allow and thus limit the pivotal movement of the clamping frame in an advantageous manner.

According to an advantageous development of the invention, a cover plate is arranged on the inner side of the clamping frame legs, into which the at least one guide screw engages or with which the at least one guide pin is connected. As a result, a particularly compact design of the chair back is achieved and, if a counter nut or threaded probe is arranged on or in the clamping frame leg, it is fixed by the cover plate and secured against a possible falling out.

It is particularly advantageous if, for damping the pivoting movement and / or the lateral movement of the inner clamping frame with respect to the outer chair back frame between the chair back frame legs and the respective adjacent clamping frame legs each a damping element, in particular a rubber element is arranged through which the threaded rod and the at least one guide pin or the at least one guide screw extend. This rubber element is preferably formed elastically. By providing the damping element, the stop of the guide pins or guide screws is pleasantly damped in both directions of rotation.

In order to reduce the friction between the threaded rod and recess in the Stuhlrückenrahmen- leg and thus to ensure easy rotation of the at least one handwheel, a storage, in particular a Nadelrillenlagerung for Threaded rod between the threaded rod and the recess in the chair back frame leg are arranged.

Furthermore, it is advantageous if an anti-rotation device is provided for the threaded rod.

Although the outer chair back frame has a flexible covering in an upper back region, the sitting comfort can be further increased.

According to a further embodiment of the invention, the outer chair back frame can be arranged on a chair back support and be telescopically adjustable in height, whereby the chair back can be particularly advantageously adapted to the body size of the seated and the seating comfort can be further increased.

If handwheels are provided on both sides of the outer chair back frame, which have a respective opposite thread, namely once a right and the other times a left-hand thread, both hand wheels can be viewed in the same direction as viewed from the seated to tighten the flexible fabric or to reduce their tension.

The invention also relates to a chair back having an outer chair back frame with two chair back frame legs and with an inner clamping frame located within the outer chair back frame with two lateral clamping frame legs, between the two chair back frame legs and between the two clamping frame legs, respectively a flexible covering is arranged. By providing such flexible fabrics for both the back and the lordosis area a high level of comfort is ensured.

The invention further relates to a chair, in particular a swivel chair with a chair back of the type described above. The advantages of such a chair or swivel chair correspond to the advantages described above with respect to the chair back. These are not listed again to avoid repetition. The invention is explained in more detail below with reference to an embodiment with reference to the accompanying figures.

1 shows a perspective view of a chair back obliquely from behind.

FIG. 2 shows an exploded view of a portion of the chair back of FIG. 1 from the front.

Fig. 3 shows an overall view of a chair with a chair back, as described in Figures 1 and 2.

Fig. 1 shows a perspective view of a chair back 100 obliquely from behind.

The chair back 100 includes an outer chair back frame 1 with two laterally disposed chair back frame legs 11 and 12 which are interconnected in an upper portion by a curved, convex, upper cross-link 13 and in a middle to lower portion by a curved, convex, lower cross-link 14 are connected. At the point where the lower cross-connection 14 attaches to the chair back frame legs 11 and 12, these each have a slight bend, and at this point are axially on the tilting support of the H-shaped clamping frame 4, on the right and left outside the chair back frame legs 11 and 12 respectively rotatable hand wheels 6a and 6b arranged.

Furthermore, the chair back 100 includes a U-shaped chair back support 2, the legs of which extend within the lower portions of the chair back frame legs 11 and 12, and on which the outer chair back frame 1 can be moved up and down and thus telescopic and height adjustable. Further, the outer chair back frame 1 in an upper region between the chair back frame legs 11 and 12, a flexible belt-like first surface covering 15, which forms the upper back portion. In the lower third of the outer chair back frame 1, a slightly narrower H-shaped clamping frame 4 is tiltably mounted. This H-shaped clamping frame 4 comprises two respectively parallel to the chair back frame legs 11 and 12 extending clamping frame legs 41 and 42 and a connecting these clamping frame cross-connection 43 which is bent in the rearward direction and convex. Between the clamping frame legs 41 and 42, a second surface covering 44 is spanned, which forms the lumbar region.

By means of the handwheels 6a and 6b, there is provided a mounting attachment of the clamping frame legs 41 and 42 of the H-shaped clamping frame, which is such that by turning the two handwheels 6a and 6b, the clamping frame legs 41 and 42 are unfolded and pressed together slightly can be so that the second surface fabric 44 can be stretched and relaxed and so individually adjusted to the needs of the user.

By rotating the handwheels 6a and 6b, the tenter legs 41 and 42 can be pulled apart and compressed under resilient movement of the tenter cross-link 43 so that the distance between the tenter legs 41 and 42 can be varied. The chair back 100 according to the embodiment is designed so that each of the two clamping frame legs 41 and 42 can be moved over a distance of 0.8 cm, so that when using both hand wheels 6a and 6b a total difference in width of 1, 6 cm between the two clamping frame legs 41 and 42 can be achieved. The rubber elements 8 can serve as damping for the clamping frame legs 41 and 42.

In the exemplary embodiment, the two handwheels 6a and 6b each have a counter-rotating thread, namely a left-hand thread and a right-hand thread, so that both handwheels 6a and 6b are rotated in the same direction as viewed from the seated end in order to tighten the second surface fabric 44 Reduce tension.

At the same time, the H-shaped clamping frame 4 can be given or tilted about the pivot axis defined by the centers of the hand wheels 6a and 6b in order to optimally adapt the orientation of the clamping frame 4 to the needs of the user. Fig. 2 shows an exploded view of a portion of the chair back 100 from the front.

In Fig. 2, the handwheel 6a can be seen with a threaded rod 61. At the bend of the chair back frame leg 11 is an axial bore 1c with a needle groove 1d storage, through which the threaded rod 61 runs in the inserted state of the handwheel 6a. The needle groove bearing 1d reduces the friction of the threaded rod 61 and thus ensures easy rotation of the handwheel 6a.

Furthermore, at the bend of the chair back frame leg 11, two radial longitudinal recesses 1a and 1b for guide screws 10a and 10b and two holes 1e and 1f for rubber element fixing screws 8a and 8b are formed.

In the clamping frame leg 41, an axial bore 4 e is provided for receiving a thread deronde 7. This threaded probe 7 has on its back a cross-clamping bolt 7a, which engages in a corresponding, on the inside of the clamping frame leg 41 mounted recess and thus secures the threaded probe 7 against rotation. Furthermore, the clamping frame leg 41 comprises bores 4a and 4b for cover plate fastening screws 9a and 9b, which connect an end plate 9, which is arranged on the inside of the clamping frame leg 41, firmly to the clamping frame leg 41. Further, the tenter leg 41 includes tenter leg bores 4c and 4d for receiving the lead screws 10a and 10b.

Between the inside of the chair back frame leg 11 and the outside of the clamping frame leg 41, an annular rubber element 8 is provided with four recesses. This rubber member 8 is for damping the pivotal movement and the lateral movement of the H-shaped clamping frame 4 with respect to the outer chair back frame 1. The rubber element 8 is by means of rubber element fixing screws 8a and 8b, which engage in the holes 1e and 1f of the chair back frame leg 11, firmly bolted to the inside of the chair back frame leg 11.

The guide screws 10a and 10b extend in the radial longitudinal recesses 1a and 1b of the chair back frame leg 11, through the recesses in the rubber The rubber element 8 is elastic and allows a rotation of the guide screws 10a and 10b between the stops of the radial longitudinal recesses 1a and 1b.

In practice, the H-shaped clamping frame 4 can be automatically tilted or pivoted by leaning on the back or pelvic area and so adjusted individually. The pivoting movement of the H-shaped clamping frame 4 relative to the outer chair back frame 1 is limited by the fact that the guide screws 10a and 10b abut against the stops of the radial longitudinal recesses 1a and 1b.

When pivoting the H-shaped clamping frame 4, the guide screws 10a and 10b move in the radial Längsausnehmungen 1a and 1b and the rubber element 8, which does not have such recesses, thereby deformed, whereby the pivoting path simultaneously enabled and limited, and which additionally slight provision of the H-shaped clamping frame 4 is effected in the starting position.

Regardless of the pivoting movement of the H-shaped clamping frame 4, the tension of the second surface covering 44 can be varied by turning the handwheels 6a and 6b.

To increase the tension of the second surface covering 44 at least one of the two hand wheels 6a and 6b is rotated in one direction, whereby the threaded rod 61, the threaded probe 7 and thus the respective clamping frame legs 41 or 42 closer to the adjacent chair back frame legs 11 and 12 respectively attracts.

When pulling apart the clamping frame legs 41 and 42, accordingly, the second surface covering 44 is tensioned, so that it presents a greater resistance to the seated person. If the handwheels 6a and 6b are operated in respectively opposite directions, the second surface covering 44 can be loosened so that the seated person is given less lumbar resistance. In this case, the highly convex shaped clamping frame cross-connection 43 is resiliently pressed together or apart. According to the invention, the first surface covering 15 of the upper back region and the second surface covering 44 of the lumbar region are designed as flexible coverings.

3 shows an overall view of a chair with the chair back 100 described above.

LIST OF REFERENCE NUMBERS

100 J chair back

1 outer chair back frame

1a, 1b radial longitudinal recesses

1c axial bore

1d needle groove storage

1e, 1f holes

11, 12 chair back frame thighs

13 upper cross connection

14 lower cross connection

15 first surface covering

2 chair back support

4 H-shaped clamping frame

41, 42 tenter leg

43 Tenter frame cross connection

44 second surface covering

4a-d clamping frame leg bores

6a, 6b handwheels

61 threaded rod

7 threaded probe

7a cross clamping bolt

8 rubber element

8a, 8b rubber element fixing screws

9 lens

9a, 9b lens fixing screws

10a, 10b guide screws

Claims

claims

A chair back comprising: an outer chair back frame (1) having two chair back frame legs (11, 12); an inner (H-shaped) tentering frame (4) having two lateral tentering legs (41, 42) interposing therebetween a flexible covering (44) and an extendable and compressible (convex) tentering frame tie (43); and at least one outside on a chair back frame leg (11, 12) arranged

A handwheel (6a, 6b) having a threaded rod (61) passing through said chair back frame leg (11, 12), through which said adjacent tenter leg (41, 42) is engageable such that said tenter cross link (43) is pulled apart and the flexible covering (44) is tensioned and by which the adjacent tenter leg (41, 42) can be moved away, so that the tenter frame

Cross-connection (43) is compressed and the flexible covering (44) is loosened.

2. Chair back according to claim 1, wherein the threaded rod (61) in a on or in a lateral clamping frame legs (41, 42) arranged locknut (7), in particular threaded probe (7) engages.

3. chair back according to claim 2, wherein the lock nut (7) with respect to the clamping frame leg (41, 42) is fixed.

4. chair back according to claim 3, wherein the lock nut (7) has a cross-clamping bolt (7a) which lies in a recess on the inside of the clamping frame leg (41, 42).

5. Chair back according to one of claims 1 to 4, wherein the inner clamping frame (4) with respect to the outer chair back frame (1) is pivotally mounted.

6. Chair back according to claim 5, wherein at least one, preferably two radial longitudinal recesses (1a, 1b) in the chair back frame-legs (11, 12) are formed, in which at least one, preferably two guide pins or guide screws (10a, 10b) run, which are connected to the adjacent clamping frame legs (41, 42) and by which a stop for the at least one, preferably for the two guide pins or guide screws (10a, 10b) is formed.

7. Chair back according to claim 6, wherein on the inside of the clamping frame legs (41, 42) each have a cover plate (9) is arranged, in which the at least one guide screw (10 a, 10 b) engages or with which the at least one guide pin is connected ,

8. Chair back according to one of claims 5 to 6, wherein for damping the pivoting movement and / or the lateral movement of the inner clamping frame (4) with respect to the outer chair back frame (1) between the chair back frame legs (11, 12) and the respective adjacent clamping frame legs (41, 42) each have a damping element, in particular a rubber element (8) is arranged through which the threaded rod (61) and the at least one guide pin (10a, 10b) extend.

9. chair back according to one of claims 1 to 7, wherein a storage, in particular a Nadelrillenlagerung (1 d) for the threaded rod (61) between the threaded rod (61) and the recess (1 c) in the chair back frame leg (11, 12) Reduction of friction is provided.

10. Chair back according to one of claims 1 to 9, wherein the outer chair back frame (1) has a flexible covering (15).

11. chair back according to one of claims 1 to 10, wherein the outer chair back frame (1) height-adjustable on a chair back support (2) is arranged.

12. chair back according to one of claims 1 to 11, wherein two hand wheels (6 a, 6 b) are provided, each having a counter-rotating thread, so that the chair ausge- see at the same direction of rotation in each case a stronger or weaker voltage of the flexible covering is achieved.

A chair back comprising: an outer chair back frame (1) having two chair back frame legs (11, 12); an inner stretcher (4) disposed within the outer chair back frame (1) with two lateral stretcher legs (41, 42), between the two chair back frame legs (11, 12) and between the two stretcher legs (41, 42) in each case a flexible covering (15, 44) is arranged.

14. Chair, in particular swivel chair with a chair back according to one of claims 1 to 13.