EP2040582B1 - Back rest for a seat of a stool or a chair, and seating furiniture provided with such a back rest - Google Patents

Abstract

The invention relates to a back rest for a stool or a chair, comprising two adjacent, spring-mounted back supports (3.1), each of which is fixed to a separate carrier part (4.1). Said back rest is characterised in that each carrier part (4.1) forms the first limb of an essentially L-shaped carrier (4), and the second limb (4.2) of each carrier (4) is fixed beneath the stool or chair seat in such a way that it can be pivoted about a horizontal axis against an elastic force.

Description

The invention relates to a backrest for the seat of a chair or armchair with two laterally juxtaposed, resiliently held backrests, each of which is attached to a separate, substantially vertically oriented first support member of a substantially L-shaped support, whose second support member in a can be mounted below the seat attachable seat base against spring force about a horizontal axis pivotally, each support member forms the first leg of a substantially L-shaped support, the second leg is pivotable in a mountable under the seat seat base against spring force about a horizontal axis.

One in the KR 2005 0023593 A described backrest may, depending on the movements or sitting positions of a seated person to a certain extent follow the back movements. When rotational movements of the upper body of a seated person occurs in the known backrest

they are no longer in a common vertical plane, creating a "jump" or offset between the two backrests with the result that there is no longer a substantially uniform, stepless backrest.

The invention has for its object to design a backrest so that even with rotational movements of the body about a vertical axis inevitably a uniform stepless backrest is maintained.

To solve this problem, a backrest according to the preamble of claim 1 is characterized by a pivotally mounted in or on the seat base, aligned in the rest position substantially perpendicular to the carriers guide rod, is articulated at the end in each case one of the two carriers, so that when moving the one back support forward or backward, the other back support is displaced in each case in the opposite direction.

The guide rod is preferably articulated with their ends to the second carrier parts of the carrier and mounted centrally between these Anleakpunkten articulated to the seat or the seat base.

Further preferred embodiments of the invention are treated in subclaims.

The invention will be described below with reference to the accompanying drawings.

• Figur 4 zeigt eine Ausführungsform der Art und Weise der Befestigung einer Rückenstütze an ihrem Trägerteil;
• Figur 5 zeigt eine Explosionsdarstellung der Ausführungsform gemäß Figur 4;
• Figur 6 zeigt eine Befestigung der Rückenstützenträger an dem Ständer eines Sessels oder Stuhls, die eine Grundlage für das eindentige Verständnis des in den Figuren 9 und 10 dargestellten Sitzunterbaus und bilden neinen Bestandteil der Vorliegenden Erfindung.
• Figur 7 zeigt eine isometrische Ansicht eines Sessels;
• Figur 8 zeigt ausschnittsweise in isometrischer Darstellung die Standersäule des Sessels mit daran angebrachtem Sitzchassis, an dem die Träger für die Rückenstützen schwenkbar befestigt sind;
• Figur 9 zeigt in isometrischer Darstellung eine Draufsicht eines an dem Sitzchassis befestigten Sitzunterbaus;
• Figur 10 zeigt zur Erläuterung des erfindungsgemäßen Prinzips eine schematisierte Teilansicht der Rückenlehnkonstruktion in Zuordnung zu dem Sitzunterbau.

FIGS. 1 to 3 show a basis for the clear understanding of the in the FIGS. 9 and 10 shown seat base and form no part of the present invention.

• FIG. 4 shows an embodiment of the manner of attaching a back support to its support member;
• FIG. 5 shows an exploded view of the embodiment according to FIG. 4 ;
• FIG. 6 shows an attachment of the backrest support to the stand of a chair or chair, which is a basis for the well-understood understanding of the in the FIGS. 9 and 10 shown seat base and form part of the present invention.
• FIG. 7 shows an isometric view of a chair;
• FIG. 8 shows a fragmentary isometric view of the pillar of the chair with attached seat chassis, on which the support for the backrests are pivotally mounted;
• FIG. 9 shows in isometric view a plan view of a seat chassis attached to the seat base;
• FIG. 10 shows a schematic partial view of the Rückenlehnkonstruktion associated with the seat base to explain the principle of the invention.

FIG. 7 shows an isometric view of an armchair, consisting of a equipped with casters foot 1.1, a supported by the base column column 1, a seat 100 and a backrest 3 with two laterally spaced back braces 3.1, which are attached to L-shaped straps 4 Each backrest 3.1 is attached to a support member 7 which is lockable along the associated first support member 4.1 in different height positions Each support member 7 contains Rubber elements, such that the individual back support is movable relative to the first support part 4.1 The first support parts 4.1 are interconnected by an elastically deformable cross brace 9, the spring stiffness is designed so that the free mobility of the individual R back support is retained relative to the other back support to a limited extent.

According to the FIGS. 1 to 3 which form no part of the present invention, the second support members 4.2 are pivotally mounted about a horizontal pivot axis 5 by means of a support unit 2. The second carrier parts 4.2 of the carrier 4 are designed as two-armed lever, acting on the free lever ends 4.3 a substantially vertically aligned spring element 6, the force acting on the carrier force is variable. In this spring element 6 may be a tension spring, a pneumatic or hydraulic spring element or the like.

In the area of the first carrier parts 4.1 illustrated latching openings 8 illustrate that the support members 7 are height-adjustable attached to the first support members 4.1.

According to FIG. 2 the back supports 3.1 are connected approximately at their center by means of an elastically deformable cross bar 3.2, whose strength is designed so that the back supports 3.1 retain their function as individual supports, the free mobility of a back support relative to the other back support is retained to a limited extent.

According to FIG. 3 are the two back braces 3.1 also each alone resiliently attached to the first support parts 4.1 of the carrier 4. In this backrest, the support members 7 are designed so that the upper ends of the first support members 4.1 project upwardly beyond the support members 7. The free ends of the first support members 4.1 are interconnected by an elastically deformable cross member 9.

According to FIG. 6 , which forms no part of the present invention is mounted in or on the support unit 2 provided with opposing threads horizontal axis 20 on which the first support members 4.2 of the carrier 4 are pivotally mounted. Each second carrier parts 4.2 is designed as a two-armed lever, the free lever end 4.4 is bevelled upwards, on which a substantially horizontally oriented tension spring 22 engages. The tension springs 22 are attached to change the force acting on the carrier force with their ends on a relative to the horizontal axis at different distances detectable adjusting member 23, for example, carries a nut 24, in which a rotatable by means of a knurled wheel 26 threaded pin 25 engages. Each second support parts 4.2 carries in the region of its bearing on the horizontal axis 20 a threaded bushing 27, such that by rotating the horizontal axis 20 due to the counter-threaded off this horizontal axis, the two second support members 4.2 can be laterally adjusted relative to each other, whereby the distance between the back supports 3.1 in accordance with FIGS. 1 and 3 can be adjusted.

The FIGS. 8 and 9 show a detail of a fixed at the upper end of the column stand 1 seat chassis 38 to which the two supports 4 are pivotally mounted in the region of the free ends of the second support member 4.2 about the pivot axis 39 shown schematically. On the seat chassis 38, a substantially box-shaped seat base 40 is fixed for example by means of screws 41, which are guided in the seat frame 40 brought Langlöchen 42, such that the seat base 40 relative to the seat frame 38 is displaceable forward and backward.

The inventive principle of this construction will be described below with reference to the schematic representation of FIG.

A core idea of the teaching according to the invention consists essentially in coupling the two backrests 3.1 together so that when the seat is displaced on the chair (chair) a person displacing the one backrest, eg backwards, inevitably moves the other backrest Has. Due to the resilient suspension of the back supports on the straps 4, the two back braces 3.1 are able to assume such a position that a substantially uniform, continuous backrest is created when the user of the chair or armchair when leaning back more against the one in FIG. 10 Backrest 3.1 shown on the right is leaning against or pushing against it more strongly than against the other backrest 3.1. This positive coupling of the two back supports 3.1 to oppositely directed movements is effected by means of a in the rest position substantially perpendicular to the carriers 4 oriented guide rod 43 which is mounted in such or in the seat base 40 and connected to the second support members 4.2, that at a backward movement of a back support 3.1, the other back support in the opposite direction, ie after the verschaben, is. In FIG. 10 the deflection angle of the guide rod 43 is shown oversubscribed with respect to the central position for clarification of the principle; In reality, the deflection angle is only very small, so that when pivoting the ends of the guide rod 43 perform only very small movements, which are in the range of tenths of a millimeter and are thus absorbed by the tolerance of the construction.

The ends of the guide rod 43 are articulated to the respective second support parts 4.2, for example by means of ball joints 44 schematically illustrated in FIG. 8b, which are preferably mounted in elastically deformable sleeves 44.1. The guide rod 43 is also centrally between its articulation points on the second support parts 4.2 also preferably by means of in FIG. 9a shown Kugslgelenks 45 in or on a longitudinal member 40.2 of the seat base 40 articulated.

The second support members 4.2 are supported by means mounted in the seat base 40 helical compression springs 46 such that the two back support 3.1 in the unloaded rest position the have the same distance from the seat base 40 and the guide rod 43 occupies a rest or middle position.

According to FIG. 9 the second support members 4.2 are provided with upwardly directed lugs 47 on which the ends of the guide rod 43 are articulated. To the lugs 47 include pressure plates 48 which are supported by means of the frame 40.1 of the box-shaped seat base 40 guided plunger 49 on the helical compression springs 46 which are aligned perpendicular to the pivot axis 39 housed in the seat base 40. The helical compression springs 46 are supported on longitudinally displaceable blocks 50, which in turn are supported on cams 52 of a rotatable by means of the handle 53 camshaft 51 to change the biasing force of the spring 46 by turning the cam 52 can.

The guide rod 43 is guided in the frame 40.1 of the seat base 40 in arcuate guide grooves 54 whose ideal axes are parallel to the pivot axis 39 of the carrier 4 and are curved relative to the front of the chair from top to back and down.

The Fünrungsnuten 54 allow the tilting or pivoting movement of the guide rod 43 in the region of the ball joint 45, such that upon pivoting of the second support member 4.2 to the rear of this support member is also pivoted down at the same time opposite movements of the opposite second support member 4.2.

FIG. 8 shows the two carriers 4 in a central, substantially parallel position when the two back braces 3.1 are either unloaded or evenly loaded.

If a user leans backwards with uniform load on both backrests 3.1, the guide rod 43 diester backward movement, which due to the articulated support of the guide rod 43 in or on the side member 40.2 of the entire seat frame 40 pulled back on the one hand and on the other hand at the same time is pivoted downwards or lowered in its rear region, in accordance with one in the DE 299 08 599 U1 described seat storage with synchronous mechanism, which, as is known, is not the subject of the present invention. Such a synchronous mechanism is used when pivoting the backrest to or to pivot back and the seat according to a predetermined angular ratio.

The rearward movement of the seat base 40 is against the force of compression springs 60 which are supported between a support plate 61 forming part of the seat chassis 38 and thus stationary, and a support surface 62 forming part of the movable seat base 40.

The FIGS. 4 and 5 show how the support member 7 is attached to a back support to allow pivotal movements of this back support 3.1 relative to the support member 7 both about a vertical axis and about a horizontal axis:
A box-shaped body 10 which is open at the top and at the bottom is provided at its end facing the support member 7 with two preferably triangular wall sections 10.1, which have opposing bearing openings 10.11. On the support member 7, a horizontally oriented bushing 11 is fixed, so that after passing through an axle pin 12 by the brought with the bearing bush 11 in the alignment position bearing openings 10.11, the body 10 is pivotally attached to the support member 7. In the space between the body 10 and the support member 7 is according to FIG. 5 placed a rubber buffer 14, which is provided with a corresponding shape of the bearing bush 11 recess 14.1. The spring stiffness of the rubber buffer 14 is designed so that a controlled pivotal movement of the body 10 about the axle pin 12 is possible.

The body 10 is provided on its side facing away from the support member 7 side with a top and bottom bounded by wall sections 10.2 opening. The wall sections 10.2 are provided with bearing openings 10.21. A fixable at the back of each back support 3.1 fastener 13 has a vertically oriented bearing bush 13.1, which carries a radially outwardly projecting partition 13.2. When the bearing bush 13.1 is brought into alignment with the bearing openings 10.21, an axle pin 14.2 can be inserted through these bearing openings 10.21 and the bearing bush 13.1, whereby the body 10 is pivotally mounted about a vertical axis on the fastening element 13. The partition 13.2 bounded within the nozzle-shaped body 10 has two receiving spaces for spring elements 15, preferably zylinderische rubber buffer whose Dimensions and spring stiffness are ausgeiegt so that a limited relative movement between the fastener 13 and the body 10 about the vertical axis defined by the axle pin 14.2 is possible.

Claims (18)

1. Backrest for a seat of a stool or chair with two back supports (3.1) that are arranged laterally adjacent to one another and secured in a springy fashion, each of which is connected to a separate, essentially vertically orientated first carrier part (4.1) of a substantially L-shaped support member (4), whose second carrier part is fastened pivotably against a spring force about a horizontal axis (5 or 39, respectively) on a seat understructure (40) characterized by a guide bar (43) that in the rest position is orientated substantially perpendicularly to the support members (4), which guide bar (43) is pivotably supported in or on the seat understructure (40), and to the ends of which guide bar (43) is pivotably connected one of the two support members (4), respectively, in such a way that upon movement of one back support (3.1) to the front or to the rear the other back support (3.1) is moved in the opposite direction, respectively.
2. Backrest according to claim 1, characterized in that the ends of the guide bar (43) are pivotably connected to the second carrier parts (4.2) preferably by means of a ball joint (44.1) that is supported in an elastically deformable sleeve.
3. Backrest according to claim 1 or 2, characterized in that the guide bar (43) is connected centrically between the connecting points to the support members (4) in a pivotable way on the seat understructure (40).
4. Backrest according to claim 2 or 3, characterized in that the guide bar (43) is guided in arc-shaped guide grooves (54) provided in or on the seat understructure (40) whose imaginary axes extend parallel to the pivot axis (39) of the support members (4) and, relative to the front end of the chair, are curved from the top to the rear and to the bottom.
5. Backrest according to claim 2, characterized in that the second carrier parts (4.2) each have an upwardly oriented projection (47) and in that the projections (47) are supported by springs (46) that, in the rest position of the L-shaped support members (4, 5) are uniformly pressure-loaded.
6. Backrest according to claim 5, characterized in that the springs (46) are coil springs whose longitudinal axis are perpendicular to the pivot axis (39) of the support members (4) and are arranged in the area of the seat understructure (40).
7. Backrest according to claim 6, characterized in that pressure plates (48) are mounted on the projections (47) and are supported on the springs (46) by means of plungers (49).
8. Backrest according to any one of the claims 5 to 7, characterized in that the pretension of the springs (46) is changeable.
9. Backrest according to claim 8, characterized in that the springs (46) with their ends opposing the pressure plates (48) rest against blocks (50) that are mobable in the longitudinal direction of the springs which blocks are supported on cams (52) of a camshaft (51) that is turnable from the exterior.
10. Backrest according to any one of the claims 1 to 9, characterized in that the guide bar (43) is attached to the seat understructure (40) supported by means of springs (60) in such a way that this seat understructure (40) upon pivoting of the support members (4) is movable to the front or to the rear relative to a seat frame (38).
11. Backrest according to any one of the claims 1 to 10, characterized in that the back/supports (3.1) preferably are attached to the first carrier parts (4.1) so as to be pivotable about substantially vertically oriented axis lines.
12. Backrest according to any one of the claims 1 to 11, characterized in that the back supports (3.1) are attached to securing members (7) which are slidable along the first carrier parts (4.1).
13. Backrest according to any one of the claims 1 or 12, characterized in that the two back supports (3.1) are connected to one another by means of an elastically deformable transverse stay (9) whose strength is selected such that the two back supports (3.1) maintain their function as individual supports and the movability of one back support relative to the other back support is maintained to a limited extent.
14. Backrest according to claim 13, characterized in that the spring force acting upon the support members (4) is changeable commonly for both support members (4).
15. Backrest according to claim 14, characterized in that the two support members (4) can be fastened at different distances from each other along their common horizontal swivelling axis.
16. Backrest according to claim 14 or 15, characterized in that each back support (3.1) is pivotable about a horizontal axis relatively to the first carrier part (4.1).
17. Backrest according to claim 16, characterized in that each back support (3.1) is fastened by means of at least one elastically deformable spring element on a sevuring member (7), that can be fastened at different height positions along the respective first carrier part (4.1).
18. Backrest according to claim 17, characterized in that on each securing member (7) a body (10) is attached that is pivotable against a spring force about a horizontally orientated pivot pin (12) wherein the body, in turn, is attached to a back support so as to be pivotably against a spring force about a vertically orientated pivot pin (14.2).

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