EP3354161A2 - Seating furniture, in particular an office chair - Google Patents

Abstract

The invention relates to a seat (2), in particular an office chair, with a seat support (6) for a horizontal seat part (12) and with a backrest support (8) for a vertical backrest (10), the back support (8) being substantially U-shaped. is formed with two vertically oriented U-legs (26) and with a horizontal upper U-leg (28), along at least one below the seat part (12) extending axis of rotation (D) a first pivot (20) and a second pivot (22) are provided for the lateral tilting mobility of the backrest (10) relative to the seat support (6), and wherein the first and second pivot (20, 22) along the axis of rotation (D) are arranged spaced from each other.

Description

The invention relates to a chair, in particular an office chair, with a seat support for a horizontal seat part and with a back support for a vertical backrest.

An office chair allows a seated user to significantly influence the dynamics of sitting. In contrast to a rigid chair, which allows only a static or motionless sitting, a so-called dynamic sitting is promoted in an office chair due to the integrated mechanisms and adjustment options. The dynamic or moving sitting in particular causes a variable load on the back muscles, which tension, fatigue and back complaints can be reduced or completely avoided as a result of prolonged periods of sitting.

From the DE 101 22 946 C1 is an office chair with a movable seat part and a movable backrest known, wherein the seat part and the backrest are coupled by means of a so-called synchronous mechanism. The synchronous mechanism allows a synchronous movement of the seat part or the seat back and the seat back to each other when the backrest is tilted from a substantially vertical upright position (home position) due to a force by the user to the rear. The thus enabled pivoting or tilting limited in such synchronous mechanisms usually on a forward and backward tilt (Wippmechanik).

The from the WO 98/48670 A1 Known office chair has in addition to the synchronous mechanism for a forward and backward tilt a tilting mechanism for a lateral, that means lateral tilting movement of the backrest. For this purpose, a substantially horizontally extending support arm of the backrest support of the backrest is guided in a spring-loaded pivot bearing of the seat support, so that the horizontal support arm of the backrest support forms the axis of rotation extending below the seat surface or the seat part.

From the DE 10 2007 002 284 A1 It is known to realize a lateral pivotal movement of the backrest of the chair by means of two each paired by support arms in pairs and arranged in the lower region of the backrest and in the front region of the seat part ball joints.

In the DE 10 2011 104 972 B4 an office chair is described in which the lateral tilting movement can be realized by means of two laterally flexible and / or articulated support arms of the backrest support.

The invention has for its object to provide a particularly suitable seating, especially an office chair. In particular, the highest possible comfort and a simple adaptation to different seating positions should be possible.

The object is achieved by the features of claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

The particular designed as an office chair seating has a seat support for a horizontal seat part and a backrest support for a vertical backrest. The particular frame-like backrest support has a substantially U-shape, wherein two vertical U-legs (vertical leg) by means of a horizontal upper U-leg (horizontal leg) are connected or coupled.

The backrest of the seat is tiltable laterally or laterally or sideways. Relative to a body axis of a user, this tilting movement thus takes place in a frontal plane, that is, from a vertical starting position in the direction transverse to a preferably also provided forward and backward inclination in a sagittal plane of the user.

For this purpose, a first rotary joint and a second rotary joint for lateral tilting mobility of the backrest relative to the seat support are provided along at least one axis of rotation extending below the seat part. The first and second pivot are in this case arranged along the axis of rotation spaced from each other. In contrast to the prior art, an additional rotary joint is thus provided along the axis of rotation below the seat part, wherein the mutually spaced rotary joints are preferably each not spring-loaded.

As a result, a particularly simple adaptation is realized in a structurally simple manner, in particular with regard to laterally tilted seating positions, thereby enabling improved dynamic sitting. This translates into an advantageous effect on increased seating comfort, so that a particularly suitable seating, especially with regard to longer periods of sitting, is realized.

Relative to a Cartesian coordinate system in which the horizontal seat part or its seat surface lies in the xy plane and the backrest extends in the z-direction, the vertical U-legs of the backrest support are oriented substantially parallel to the z-direction. The vertical U-legs extend substantially starting from the located below the seat part seat carrier upwards. The horizontal U-leg is suitably arranged approximately in the middle or upper region of the backrest and preferably on its back. Under such a U-shape of the backrest support are also about V-shaped or trapezoidal configurations to understand in which the vertical U-legs are not completely aligned parallel to each other, but at least partially inclined at an angle to each other.

In a suitable embodiment is provided for attachment or mounting of the backrest carrier to the seat support that the vertical U-legs on the seat side free ends horizontally directed and extending below the seat part retaining arms which surround the seat support at least partially laterally, so the seat support at least partially laterally flank. As a result of the support arms, which are also referred to below as cantilever, attachment or support arms, the backrest support has an approximately L-shaped contour in a projection onto an xz plane or sagittal plane of a user. The vertical L-leg is in this case formed by the vertical U-legs and the horizontal L-leg through the support arms.

The backrest support formed by the support arms and U-legs is in one possible embodiment, preferably in one piece or in one piece, that is monolithic, made of a flexible elastically deformable material, for example a plastic or spring steel material. The backrest support, in particular its U-legs, in this case preferably have a cross-sectional shape, which allows a flexurally elastic deformation or torsion along the respective U-leg and / or supported. In the case of a lateral tilting or tilting movement of the backrest, an at least slight twisting movement of the backrest about a torsion axis oriented parallel to the vertical U-legs thus takes place. Due to the bending elasticity thus a restoring force is effected, which urges the backrest back into the vertical starting position. Thus, a particularly advantageous and ergonomic sitting, especially with regard to lateral tilting movements guaranteed.

In an equally possible embodiment, the back support is additionally or alternatively coupled to the flexurally elastic deformability with spring elements which generate or support a restoring force in the course of a lateral tilting movement. This ensures that the backrest is always reliably guided to the starting or upright position.

However, it is also conceivable, for example, that between the vertical U-legs and the support arms and / or between the vertical U-legs and the horizontal U-leg flexible or articulated connection elements are provided. This makes it possible to perform the U-legs and / or the support arms (bending) rigid, without adversely affecting the tilting mobility of the backrest.

In an advantageous development, a transversely directed to the axis of rotation rocker is arranged between the vertical U-legs, in particular between the support arms. The transverse strut-like and horizontally arranged rocker improves the stability of the backrest support. Preferably, the rocker is hereby movably or hingedly positioned and connected between the support arms.

In one possible embodiment, the rocker is formed of two vertically stacked half-shells. As a result, the assembly of the rocker is simplified on the backrest support.

For the purpose of the simplest possible and stable assembly, the half-shells of the rocker are screwed together in a conceivable embodiment. In a visually particularly attractive development, it is provided here that the screwing of the half-shells is covered or covered by means of an attached cover shell or a cover plate.

In an expedient embodiment, the rocker is attached to the seat support. For this purpose, the rocker is screw-mounted, for example, on a lean-side end side of the seat support. As a result, on the one hand a reliable attachment and mounting of the backrest support is realized on the seat support. On the other hand, the mobility, in particular the Kippbeweglichkeit, the backrest is not adversely affected due to the preferably flexible or articulated connection of the rocker to the support arms of the back support.

An additional or further aspect of the invention provides that a first rotary joint and a second rotary joint for lateral tilting mobility of the backrest relative to the seat support are respectively provided along the retaining arms. Preferably, each of the first and second pivot joints of the holding arms forms an axis of rotation for lateral tilting mobility. This allows a particularly advantageous and reliable adaptation to different seating positions.

In an advantageous embodiment, the or each first rotary joint is designed as a ball joint, wherein in each case a joint-like extension of the seat support engages in a joint socket-like receptacle of the support arm. Also conceivable is an embodiment of the ball joints, in which the receptacles in the seat support and the extensions are integrally formed on the support arms. In this case, the first rotary joint is preferably arranged in the region of the free end of the respective holding arm, that is to say on the arm end facing away from the U-legs or the backrest. This ensures a particularly dynamic sitting.

In a preferred embodiment, the or each second rotary joint is formed as a hinge joint, wherein the holding arms each have a roller-like extension, which are each comprised of a groove-like recording of the rocker. Also conceivable is the kinematic reversal formed on the rocker extensions and recordings of the support arms.

In a conceivable alternative embodiment, the or each first rotary joint is designed as a hinge joint and the or each second rotary joint as a ball joint. Likewise conceivable are embodiments in which both the first and the second pivot joints are designed as hinged joints or ball joints.

In a preferred embodiment suitably operable locking means are provided for example in the region of the backrest and / or the seat support, which allow a user, if desired, the lateral or lateral Tilting mobility of the backrest support or the backrest to block or block or arrest or at least restrict.

In a suitable development, the blocking means is designed to block the rotational mobility of the or each second rotary joint. The second pivot joint is preferably arranged closer to the backrest support or the backrest along the axis of rotation or along the support arm than the first pivot joint. As a result, the lateral tilting mobility is reliably inhibited in a blockage of the second rotary joint, at least restricted or locked. It is possible that both second hinges are locked substantially synchronously. To block the lateral tilting mobility, however, the blocking of only one of the two second pivot joints is sufficient.

In an expedient embodiment, the blocking means is arranged in the rocker. The rocker is in this case designed in particular as a housing for the mechanism of the locking means. The second pivot is in this case pivotally coupled to a locking pin, which freiendseitig in a positive engagement with a spring-loaded locking block can be brought. The blocking block is in this case suitably movable upon actuation of the blocking means, so that the engagement or the positive connection between the locking pin and the blocking block can be reversibly released and produced. As a result, a particularly reliable and reliable restriction of the lateral tilting mobility of the backrest support is realized.

Fig. 1

in einer Seitenansicht einen Bürostuhl als Sitzmöbel mit einem Sitzträger für ein Sitzteil (Sitzfläche) und mit einem Lehnenträger einer lateral neigbaren Rückenlehne,

Fig. 2

in einer perspektivischen Ansicht den Bürostuhl in einer zweiten Ausführungsform,

Fig. 3

in einer Explosionsdarstellung den Sitzträger und den Lehnenträger,

Fig. 4

in einer Rückansicht den Sitzträger und den Lehnenträger des Bürostuhls,

Fig. 5

in einer Seitenansicht den Sitzträger und den Lehnenträger,

Fig. 6

in perspektivischer Ansicht ausschnittsweise den Sitzträger und den Lehnenträger in einer Explosionsdarstellung,

Fig. 7

in einer perspektivischen Ansicht den Lehnenträger,

Fig. 8

in einer perspektivischen Ansicht ausschnittsweise einen Haltearm des Lehnenträgers,

Fig. 9

in einer Explosionsdarstellung eine Schwinge des Lehnenträgers,

Fig. 10

in einer Schnittdarstellung Kugelgelenke zwischen den Sitzträger und den Haltearmen,

Fig. 11

in einer Schnittdarstellung Scharniergelenke zwischen den Haltearmen und der Schwinge, und

Fig. 12a, 12b

in einer Schnittdarstellung ein Sperrmittel der Schwinge.

Embodiments of the invention are explained in more detail with reference to a drawing. In it show in simplified and schematic representations:

Fig. 1

in a side view of an office chair as a chair with a seat support for a seat part (seat) and with a backrest support a laterally tiltable backrest,

Fig. 2

in a perspective view of the office chair in a second embodiment,

Fig. 3

in an exploded view of the seat support and the backrest support,

Fig. 4

in a rear view the seat support and the backrest support of the office chair,

Fig. 5

in a side view of the seat support and the backrest support,

Fig. 6

in a fragmentary perspective view of the seat support and the backrest support in an exploded view,

Fig. 7

in a perspective view the backrest support,

Fig. 8

in a perspective view a fragmentary view of a support arm of the backrest support,

Fig. 9

in an exploded view, a swingarm of the backrest,

Fig. 10

in a sectional view ball joints between the seat support and the support arms,

Fig. 11

in a sectional view hinge joints between the support arms and the swingarm, and

Fig. 12a, 12b

in a sectional view a blocking means of the rocker.

Corresponding parts and sizes are always provided with the same reference numerals in all figures.

That in the Fig. 1 Seating furniture 2 designed as an office chair comprises a seat support 6 which is fixedly connected to a base (foot cross) 4 and which is coupled to a backrest 10 via a backrest support 8. In the seat support 6, a so-called synchronous mechanism is preferably integrated, which performs a synchronous movement of a arranged on the seat support 6 seat part (seat, seat) 12 with the backrest 10, when this from the illustrated vertical starting position (upright position) in a rearwardly inclined position is deflected.

The seat support 6 and thus the seat part 12 and the backrest 10 connected via the backrest support 8 with the seat support 6 are connected to the base 4, for example has three, four or five radially extending arms 14 with end pivotally mounted chair rollers 16, rotatably connected or coupled. By way of example only an arm 14 and a chair roller 16 are provided with a reference numeral in the figures.

The Fig. 1 shows the chair or the office chair 2 in a side view with a view of a sagittal or xz plane S, wherein a corresponding Cartesian coordinate system parallel to the seat of the seat part 12 xy-plane or transverse plane T and parallel to the starting position of the backrest 10 Z axis has. The x-axis is oriented substantially along the longitudinal sides of the seat surface and the y-axis substantially along the broad sides of the seat surface of the seat part 12.

As in the side view of Fig. 1 Comparatively clearly visible, the backrest support 8 in a projection onto the sagittal plane S has essentially an L-shaped cross-sectional shape. A directed along the x-axis horizontal support arm 18 of the backrest support 8 extends here below the seat part 12. In the embodiment of the Fig. 1 the holding arm 18 is at least partially received within the seat support 6.

Like in the Fig. 1 shown by dashed lines, the holding arm 18 is in this case by means of two along the x-axis spaced hinges 20 and 22 for a lateral tilting movement of the backrest 10, which means in a frontal or yz plane F laterally or sideways tilt or tilt, designed and set up. Along the connecting line between the swivel joints 20 and 22, an axis of rotation D for a lateral tilting movement of the back support 8 or the backrest 10 is thus formed.

In the FIGS. 2 to 11 is one or the office chair 2 shown in structurally comparatively detailed representations. Hereinafter, this embodiment will be described with reference to FIG Fig. 2 to Fig. 11 explained in more detail.

The Fig. 2 shows the office chair 2 in a perspective view. To the seat support 6 of the office chair 2, two armrests 24 are fixed in this embodiment, which stand up to the seat part 12 in the vertical direction. The backrest 10 is in the Fig. 2 not shown, so that a better view of the backrest support 8 is possible. The frame-like backrest support 8 has in this embodiment in a projection on the frontal plane F substantially a U-shape. The backrest support 8 in this case comprises two in the Ausgansposition along the z-axis oriented vertical U-leg (vertical leg) 26 and directed along the y-axis upper horizontal U-leg (horizontal leg) 28. The legs 26, 28 of the backrest support 8 form this essentially a mounting or support frame for the attachable or attached backrest 10th

In the Fig. 3 the office chair 2 is shown in a perspective exploded view or in the partially disassembled state. The seat support 6 has a shell-like housing 30 in which a synchronous mechanism 6a is received in the assembled state. As in the perspective exploded view of Fig. 3 is comparatively clear, two horizontal support arms 18 are formed on the free ends 26a of the vertical leg 26, ie at the lower or seat-side leg ends.

The support arms 18 and legs 26, 28 form one piece, ie in one piece or monolithic, the backrest support 8. The backrest support 8 in this case has a widened to the backrest 10 contact surface 32. Due to the widened contact surface 32, the holding arms 18 and legs 26, 28 have a comparatively small thickness in cross-section. The backrest support 8 is preferably made of a flexurally elastic spring steel or plastic material, wherein the comparatively small material thickness of the support arms 18 and legs 26, 28 allows a high flexural elastic deformability, which is the lateral tilting mobility of the backrest 10 beneficial.

Due to the U-shaped profile of the legs 26, 28 along the defined by the leg width contact surface 32 to the seat part 12 moves to arranged thereon (not shown) backrest 10 as a result of a sideways or laterally directed force on a circular path or along a circular arc parallel to the frontal plane F. The radius of this arcuate backrest movement, which can be adapted to the arc contour of the backrest 10 facing seat part edge is set, dimensioned or designed such that the laterally sloping backrest 10 neither noticeably enters the seat part 12, nor moves noticeably away from it.

As based on the Fig. 4 and the Fig. 5 is comparatively clearly visible, the vertical legs 26 are slightly inclined in this embodiment in a projection on the sagittal plane S ( Fig. 5 ), wherein the vertical legs 26 in the projection on the frontal plane F ( fig. 4 ) are oriented in particular in the region of the free ends 26 a approximately V-shaped converging towards each other. The free ends 26a in this case run slightly backwards, ie away from the seat part 12, so that the backrest support 8 is approximately S-shaped in the projection onto the sagittal plane S.

The upper S-bend here is formed by the horizontal leg 24 and the vertical legs 26, wherein the lower S-arm is formed by the support arms 18 and the central region connecting the arches of the free ends 26 a. As a result, the bending elasticity of the backrest support 8 is improved, also with regard to a forward and backward tilting movement.

Based on Fig. 6 the lateral tilting mobility of the backrest 10 and the backrest support 8 is explained in more detail. The Fig. 6 shows a detail of the synchronizing mechanism 6a of the seat support 6 and the lower part of the backrest support 8 in an unassembled state.

In the region of the lower S-arm, that means in the transition region of the free ends 26a to the holding arms 18, a transverse strut 34 is mounted in the mounted state. The cross strut 34 is fastened to a respective attachment point 36 of the vertical leg 26 and the free ends 26 a, so that the transverse strut 34 in the assembled state runs approximately horizontally between the vertical legs 26 at the height of the seat part 12 ( Fig. 4 . Fig. 7 ).

The transverse strut 34 is preferably made of a flexurally elastic fiberglass material and has with respect to the sagittal plane S, for example, an approximately U-shaped cross-sectional shape. Additionally or alternatively, the fastening of the transverse strut 34 takes place at the attachment points 36 by means of flexible or articulated connection elements. By the transverse strut 34, the stability of the frame-like backrest support 8 is improved, at the same time the bending elastic deformability or torsion of the vertical leg 26 in the course of a lateral tilting or inclination of the backrest 10 is not adversely affected.

In the Fig. 8 individually shown holding arms 18 of in Fig. 7 individually illustrated backrest support 8 have freiendseitig, which means seat or seat carrier side, each having a molded-38. The receptacle 38 is part of the designed in this embodiment as a ball joint rotary joint 20. The joint socket or ball socket-like receptacle 38 takes in the assembled state a spherical, about hinge-like, extension 40 as a counterpart. The extension 40 is - as in particular in Fig. 6 seen - laterally upstanding attached to the seat support 6 and its synchronous mechanism 6a.

The extension 40 is formed by a spherical (joint) head 42 and an attached, approximately bolt-shaped, (joint) neck 44.

The extension 40 and the receptacle 38 form in the assembled state, the rotary joint 20, wherein additionally carried by the hinge 20 an attachment of the respective support arm 18 on the seat support 6. For this purpose, the holding arm 18 comprises the seat carrier 6 in the assembled state at least in sections on the longitudinal sides of the seat carrier 6 (FIG. Fig. 5 ), so that the spherical head 42 of the extension 40 engages positively in the receptacle 38.

The Fig. 10 shows a section of a frontal plane F, which passes through the hinge 20. As in the sectional view of Fig. 10 comparatively clearly is apparent, the spherical head 42 of the extension 40 is substantially completely in the receptacle 38 of the support arm 18 a. In particular, the receptacle 38 surrounds the head 42 beyond its equator, so that the ball joint 20 is configured in particular in the manner of a nut joint. As a result, the mobility of the rotary joint 20 is restricted, which advantageously transfers to the stability of the attachment or the mounting of the support arm 18 on the seat support 6.

Like in the Fig. 10 shown, the laterally diametrically opposite projections 40 on the seat support 6 are interconnected. In particular, the necks 44 of the heads 42 are formed as a common bolt or axle rod 46 passing through the seat support 6 and the synchronizing mechanism 6a, respectively. As a result, the stability of the projections 40 is improved.

Between the receptacle 38 and the free end 26 a, a roller-like extension or (joint) head 48 is formed on the holding arm 18 in each case. The head 48 is thus arranged along the x-axis or in arm longitudinal direction to the receptacle 38 - and thus to the hinge 20 - spaced.

In the assembled state ( Fig. 11 ), the roller-shaped head 48 by a trough-shaped (joint) receptacle 50 of a arranged between the support arms 18 rocker 52 is included. The roll longitudinal direction of the head 48 is in this case oriented in parallel along the arm longitudinal direction of the respective holding arm 18. The head 48 and the receptacle 50 in this case form the rotary joint 22, which is designed in particular as a hinge joint.

Thus, both a ball joint 20 and a hinge joint 22 is arranged along each arm 18, so that along the arm longitudinal direction of the support arms 18 each have an axis of rotation D for the lateral tiltability of the backrest 10 is formed. In other words, the office chair 2 in this embodiment, two below the seat part 12 extending and to each other (horizontally) spaced rotation axes D.

In the Fig. 9 individually illustrated rocker 52 includes a lower half-shell or rocker part 52a and a vertically aufsetzbare upper half-shell or rocker part 52b and at least on the upper rocker part 52b placed and this partially enclosing cover 52c. In the assembled state, the rocker 52 is arranged crosswise between the retaining arms 18. The rocker 52 is in this case flexibly or articulated by means of the receptacles 50 positively secured to the heads 48 of the support arms 18.

In the assembled state, the swinging parts 52a and 52b are sandwiched vertically, that is, stacked along the z-axis. The rocker parts 52a and 52b have on the opposite, the holding arms 18 facing narrow sides in each case an approximately quarter-circular half-channel 50a and 50b. In the stacked or assembled state, the half-barrels 50a of the swinging part 52a and the half-barrels 50b of the swinging part 52b form the channel-shaped receiver 50 for the hinge 22.

For assembly, the swing member 52a is guided from below to the support arms 18, so that the heads 48 each einliegen at least partially in the half-inner 50a. Subsequently, the rocker part 52b is placed from above, so that the upper half-pipes 50b are placed on the heads 48. As in the Fig. 11 clearly shown, the receptacles 50 formed by the half-lips 50a and 50b include the respective heads 48 beyond their respective (roller) equator, so that a secure and positive (bearing-like) attachment of the rocker 52 to the support arms 18 is given.

For mounting the rocker 52, the rocker parts 52a and 52b are screwed together vertically. For this purpose, two fastening screws 54 are guided from below through recesses 56 of the rocker part 52a and screwed into corresponding threaded bores of the rocker part 52b. Subsequently, the rocker 52 is fastened by means of two fastening screws 58 on the seat support 6. The fastening screws 58 are for this purpose along the y-axis through recesses 60 of the swing member 52b out and screwed into corresponding threaded holes of the seat support 6 and / or the synchronizing mechanism 6a. For optically handsome cover the screw heads of the mounting screws 58, the cover 52c is finally placed on the swing part 52b.

Due to the positive retention by means of the hinge joint 22 takes place in the course of screw mounting the rocker 52 on the seat support 12 thus also fixing the bearing bracket 8 on the seat support 12. In other words, the bearing support 8 on the one hand by means of the ball joints 20 and on the other hand by means of the rocker 52 on the Seat part 12 of the office chair 2 attached. As a result, a reliable and reliable attachment or mounting of the backrest 10 is realized on the seat support 12. At the same time, the flexurally elastic deformability of the backrest support 8 is not adversely affected, so that a lateral tilting mobility is not restricted thereby.

Preferably, a locking or locking means 62 is provided on the backrest support 8 and / or on the seat support 6, which blocks, blocks or at least restricts the lateral tilting mobility of the backrest 10 upon actuation by the user. Hereinafter, an embodiment of the locking means 62 based on Fig. 12a and the Fig. 12b explained in more detail.

The Figures 12a and 12b show in sectional views in each case an alternative embodiment of the rocker 52 with an integrated therein blocking means 62 for blocking the mobility of at least one of the hinge joints 22 of the support arms 18 in a locked state ( Fig. 12a ) and in an unlocked state ( Fig. 12b ). The rocker 52 is designed in this embodiment, in particular as a housing for the mechanism of the locking means 62.

The blocking means 62 is thus in particular configured and designed to block or block the second rotary joint 22, that is to say that rotary joint which is arranged closer to the backrest 10 on the holding arm 18. Thus, the mobility along the axis of rotation D or along the support arm 18 blocked between the seat carrier-side rotary or ball joint 20 and the backrest support 8. As a result, the lateral tilting mobility of the backrest support 8 is blocked or at least limited.

The blocking means 62 has a pull cable 64 for actuation, which is guided by means of a spring element 66 to a lever element 68. this projects at least partially out of the rocker 52 and 52c from the cover. The pull cable 64 can be actuated by a user, for example by means of a lever on the seat support 6. The lever element 68 mounted pivotably at a central pivot point 70 is coupled at a free end opposite the spring element 66 to a blocking block 72 guided linearly along the y-axis.

The blocking block 72 is coupled to a spring element 74 designed in particular as a tension spring, which is relaxed in the unlocked state. The locking block 72 has a receptacle 76 for a locking pin 78.

The locking pin 78 is - as in the Figures 12a and 12b seen - pivotally coupled to the (joint) head 48 of the hinge joint 22. This means that the locking pin 78 is pivoted on the head side upon rotation of the hinge joint 22. Thereby pivots the opposite, blocking block-side free end of the locking pin 78 in the unlocked state along the z-axis within the rocker 52. The half-lips 50a and 50b each have an unspecified recess, so that a passage opening in the associated receptacle 50 for the Locking pin 78 is formed.

In the locked state, the blocking-block-side free end of the locking bolt 78 engages in the receptacle 76 of the blocking block 72 in the manner of a pawl and positively. In the locked state, the tension spring 74 is tensioned. Upon re-actuation of the pull cable 64, the blockage is released so that the tension spring 74 can relax and moves the lock block 78 out of the blocking position. As a result, the free end of the locking pin 78 slides out of the receptacle 76, so that the locking pin 78 is free end side movable.

In a suitable dimensioning, the spring element 66 in this case has a greater spring strength, ie a greater spring stiffness or spring constant, than the spring element 74. As a result, a reliable and reliable operation of the locking means 62 is achieved. In particular, it is prevented that the spring element 74 does not unintentionally relax, and thus releases the blockage. Instead of the spring element 66, it is also possible, for example, for the pull cable 64 to have a suitably dimensioned tensile elasticity.

The invention is not limited to the embodiments described above. Rather, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, all the individual features described in connection with the exemplary embodiments can also be combined with one another in other ways, without departing from the subject matter of the invention.

So it is conceivable, for example, that to improve the restoring force in a deflected backrest support 8, the flexurally elastic deformability of the back support 8 is supported by means of additional spring elements.

It is also conceivable, for example, that the blocking means 62 is designed and arranged for blocking or locking both rotary joints 22 on the holding arms 18. Preferably, the hinges 22 are thereby blocked or locked substantially synchronously during an actuation.

LIST OF REFERENCE NUMBERS

2

Seating / office chair

4

Stand / foot cross

6

seat support

6a

synchronous mechanism

8th

backrest support

10

backrest

12

seat part

14

poor

16

Castor chair

18

holding arm

20

Rotary joint / ball joint

22

Hinge / hinge

24

armrest

26

U-leg / vertical leg

26a

free end

28

U-leg / horizontal leg

30

casing

32

contact surface

34

crossmember

36

attachment point

38

admission

40

extension

42

head

44

neck

46

Bolt / rod axis

48

Extension / head

50

admission

50a, 50b

half gutter

52

wing

52a, 52b

swing part

52c

cover shell

54

fixing screw

56

recess

58

fixing screw

60

recess

62

blocking means

64

rope

66

spring element

68

lever member

70

pivot point

72

locking block

74

Bungee / tension spring

76

admission

78

locking pin

x, y, z

axis

S

sagittal plane

F

frontal plane

T

transverse plane

D

axis of rotation

Claims (13)

Seating furniture (2), in particular an office chair, having a seat support (6) for a horizontal seat part (12) and a backrest support (8) for a vertical backrest (10), - wherein the backrest support (8) is substantially U-shaped with two vertically oriented U-legs (26) and with a horizontal upper U-leg (28), - Wherein along at least one below the seat part (12) extending axis of rotation (D) a first pivot (20) and a second pivot (22) for lateral tilting movement of the backrest (10) relative to the seat support (12) are provided, and - Wherein the first and second pivot (20, 22) along the axis of rotation (D) are arranged spaced from each other. Seating furniture (2) according to claim 1,
characterized,
that the vertical U-legs (26) on its seat-side free ends (26a) horizontally directed and below the seat part (12) extending support arms (18) which surround the seat support (12) at least partially laterally. Seating furniture (2) according to claim 2,
characterized,
that between the vertical U-legs (26), in particular between the support arms (18), a transversely to the axis of rotation (D) directed rocker (52) is arranged. Seating furniture (2) according to claim 3,
characterized,
that the rocker (52) (52a, 52b) is formed of two vertically stacked half-shells. Seating furniture (2) according to claim 4,
characterized,
in that the half-shells (52a, 52b) of the rocker (52) are screwed together. Seating furniture (2) according to claim 5,
characterized,
that the screw connection of the half-shells (52a, 52b) by means of an attached cover shell (52c) is hidden. Seating furniture (2) according to one of claims 3 to 6,
characterized,
in that the rocker (52) is fastened to the seat support (12). Seating furniture (2) according to one of claims 2 to 7,
characterized,
in that a first rotary joint (20) and a second rotary joint (22) for lateral tilting mobility of the backrest (10) relative to the seat support (12) are provided along the retaining arms (18). Seating furniture (2) according to one of claims 2 to 8,
characterized,
in that the or each first pivot joint (20) is designed as a ball joint, wherein in each case a joint-like extension (40) of the seat support (12) engages in a joint-socket-like receptacle (38) of the retaining arm (18). Seating furniture (2) according to one of claims 3 to 9,
characterized,
in that the or each second rotary joint (22) is designed as a hinge joint, wherein the retaining arms (18) each have a roller-like extension (48), each of which is surrounded by a groove-like receptacle (50) of the rocker (52). Seating furniture (2) according to one of claims 1 to 10,
characterized,
that a manually operable locking means (62) is provided for blocking or blocking the lateral tiltability of the backrest support (8). Seating furniture (2) according to claim 11,
characterized,
in that the blocking means (62) are designed to block the mobility of the or each second rotary joint (22). Seating furniture (2) according to claim 11 or 12,
characterized,
in that the blocking means (62) is arranged in the rocker (52) and has a locking pin (78) which is coupled to the second rotary joint (22) so as to be able to be brought into engagement, in particular with positive engagement, with a spring-loaded locking block (72).

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