EP2606769A1 - Seating furniture with a coupled backrest and seat adjustment - Google Patents

Abstract

The furniture has a rear height-adjustable seat and an inclination-adjustable backrest arranged at a supporting frame. The seat is pivoted at the frame around a horizontal pivot axis. The backrest is inclinedly connected with the seat and the frame by a coupling fitting (8), which upwardly and/or downwardly moves the seat backwards by inclination adjustment of the backrest. The fitting includes a four-link four-bar gear mechanism to movably connect the backrest and the seat with each other, and a two-link toggle gear mechanism to movably connect the backrest and the frame with each other.

Description

The invention relates to a chair, in particular poster furniture, with a support frame on which a rear height adjustable seat and a reclining backrest are arranged, wherein the seat is pivotable about a horizontal pivot axis on the support frame and the backrest via a coupling fitting with the seat and the support frame tilted connected is. The seat has a coupled backrest and seat adjustment, wherein the coupling fitting moves the seat upwards or downwards with a tilt adjustment of the backrest. Under seating in this context, both single-seater and multi-seater understood, the multi-seater include at least two docked to each other single seater. The chair can be designed with or without side armrests.

Such chairs are known for example in the form of armchairs and sofas, especially with side armrests. Are known from the prior art differently comfortable and differently complex designed generic chairs, armchairs or sofas with a coupled backrest and seat adjustment, in which a tilt angle of the seat and the backrest are synchronously variable with each other. The adjustment of the seat is usually effected by the adjustment of the backrest. A generic Seating in the form of a cushioned chair is for example in the document DE 195 80 182 T1 disclosed.

The font DE 195 80 182 T1 teaches a chair, with a chair frame and an adjustable backrest, which is rotatably connected to a rear end of a seat. The backrest has a lower extension connection which is connected below the side parts of the chair. This allows lowering of the entire backrest when it is reset. The front end of the seat is rotatably connected to the fixed chair frame, so that the seat swings down rear without being greatly raised at the front, when the backrest is tilted backwards. The erection of the backrest causes an opposite movement. The rotary connection between the seat surface and the backrest is arranged so that it counteracts a sliding against each other whose pad surfaces.

Disadvantage of the known seating is that the coupling fitting that connects the chair frame, the backrest and the seat movable together, complicated and thus expensive to manufacture and assemble and no comfortable adjustment of the inclination allows.

The invention has for its object to propose a generic seating, the coupling fitting is easy to manufacture and assemble, and is easy and comfortable to use.

This object is achieved by a chair with the features of claim 1. Further advantageous embodiments can be found in the dependent claims.

The seating furniture according to the invention has a coupling fitting with a four-link four-bar linkage and with a two-part toggle mechanism. The four-bar linkage connects the backrest and seat, the toggle mechanism backrest and support frame movable together. In the inventive Seating furniture, which has a support frame with a rear height-adjustable seat and a reclining backrest with a coupled backrest and seat adjustment, the seat is pivotable about a horizontal pivot axis. The position of the pivot axis with respect to the front or Hinderkante the seat determines the extent to which the seat back, ie near the backrest moves up or down, when the backrest from an upright position to a rear tilted tilt position or is brought upside down. The synchronous coupled adjustment of the backrest and seat is provided by the new coupling fitting, which connects the seat, backrest and support frame to one another in a mobile way. It is self-evident that such a piece of furniture has in each case two such coupling fittings which are arranged to the right and left of the seat or the backrest. In the event that the seating is a multi-seater, the respective seats or backrests are not interconnected. The individual seating elements, provided they are equipped with a coupled backrest and seat adjustment, correspond in structure to that of a single-seater.

The four-bar linkage comprises four strut-like coupling links, which are rotatably mounted at four hinge points. The four coupling links are preferably of different lengths and form an uneven quadrilateral. In this case, one of two opposing coupling members is firmly connected to the backrest and the other firmly connected to the seat. The toggle mechanism comprises two strut-like lever members which are rotatably mounted at two fixed pivot points. The two lever members are preferably formed differently long. In this case, one end of the short lever member is advantageously pivotally mounted at a fixed pivot point of the support frame and one end of the long lever member at a fixed pivot point of the backrest. The other ends of the lever members are pivotally connected together at a central pivot point of the toggle mechanism.

In a preferred embodiment of the invention, the four-bar linkage has two rear pivot points fixedly connected to the backrest and two front pivot points fixedly connected to the seat. By suitable choice of the length of the coupling members of the four-bar linkage and the arrangement of the hinge points to each other, the movement curve of the backrest when adjusting can be realized in the desired manner. Both the end positions and the intermediate positions are defined.

Preferably, the toggle mechanism has a rear fulcrum fixedly connected to the backrest and a front fulcrum fixedly connected to the support frame, the short and long lever members being connected to each other at an intermediate central pivot point. The rear and the front pivot point of the toggle mechanism is formed in connection with a front and rear base part of the toggle mechanism, each having a horizontal axis of rotation and is secured to the support frame or the backrest.

The backrest acts on the longer lever member of the toggle mechanism near the middle pivot point. In this case, determines the length of the lever members of the toggle mechanism and the Einwirkstelle the backrest, the force with which the backrest moves the rear seat downwards or upwards. The leverage is ideally chosen so that a comfortable adjustment of the backrest with not too much effort is possible. This leverage is tuned to a seated person, especially an adult middle body weight.

For a simple construction and a reliable mode of action of the coupling fitting, in a preferred embodiment of the invention, the four-bar linkage and the knee joint gearbox are mechanically coupled to one another. The four-bar linkage acts with one of its coupling members directly on one of the lever members, preferably on the long lever member of the toggle mechanism one. The coupling point is ideally located near the pivot point of the toggle mechanism on the long lever member.

In a particularly favorable embodiment of the seat according to the invention, a lower coupling member of the four-bar mechanism, which extends between the front lower and the rear lower pivot point of the four-bar mechanism extended by an extension beyond the front lower pivot point and forms the long lever member of the toggle mechanism. In this way, a simple and reliable coupling between the four-bar linkage and the toggle mechanism is achieved. The extended lower coupling member replaces the longer lever member of a not connected to the four-bar linkage toggle mechanism. This leads to a simplified construction of the coupling fitting and thus to low production costs. The extent of extension of the lower coupling member, d. H. the distance of the front lower hinge point of the four-bar mechanism to the pivot point of the toggle mechanism, determines the leverage of the toggle mechanism crucial. This must take into account both the body weight of a user and the weight of the seat. In addition, a low stiffness and high reliability of the coupling fitting is achieved by this special type of coupling.

The extension of the lower coupling member may extend in any direction along or transverse to the connecting line of the associated pivot points of the four-bar linkage. It can have a straight or curved shape. Preferred is an embodiment in which the lower coupling member has an angled away from the four-bar link pointing away straight extending extension which is rotatably connected to the short lever member of the toggle mechanism. Due to the bending of the extension, the toggle mechanism and the four-bar mechanism do not interfere with the adjustment of the backrest and the seat. In addition, so that the distance of the pivot point of the toggle mechanism is increased to the rear edge of the seat. An initiation of the Pivot point of the toggle mechanism to the seat is thus reliably prevented.

In one embodiment of the invention, the four-bar mechanism has a front relative to the backrest movable associated with the seat coupling member with a lateral extension on which, for example, an L-shaped fastening part for the seat is arranged. The fastening part can be screwed to the seat.

In addition, the coupling fitting may have a side cover plate which engages over the four-bar linkage and the toggle mechanism. The cover prevents a user of the chair from inadvertently placing his or her fingers in one of the gears. A violation of the user when adjusting the backrest and seat is thus excluded. In addition, no objects can engage or fall in the transmission and block the four-bar linkage and / or the toggle mechanism. A secure function is guaranteed.

In another variant of the invention, the front coupling member is not strut-like but increases in width. It has an approximately square shape and thus acts as a cover plate, which covers the other coupling members of the four-bar linkage and the lever members of the toggle mechanism.

In one embodiment of the proposed chair extends between the support frame and the backrest a rotatably connected gas spring, which is arranged inclined relative to the support frame and the backrest and is tensioned when tilting the backrest. The gas spring acts only in an adjustment direction of the backrest and supports the erection of the backrest of any rear tilting position in the upright position. It noticeably increases the ease of use. In addition, it can support the backrest springy and thus increases the comfort of the user. For adjustment, that is to tilt the backrest towards the rear, the user must make a force against the direction of action of the gas spring. This is particularly troublesome for small and light as well as elderly persons. However, the four-bar linkage and the toggle mechanism reduce this effort through their translation.

Preferred is an embodiment of the seat according to the invention, in which the gas pressure spring has means for locking and unlocking. It has proven to be beneficial to make the lock automatically and to do the unlocking manually. It goes without saying that the effect of the gas spring must be matched to the body weight of an average person.

In a variant of the seat according to the invention a leg rest is arranged in front of the seat, which is preferably not adjustable. It is firmly connected to the support frame of the chair, wherein the leg rest forms a flat surface in the basic position of the backrest with the seat, at least in the region of the transition of leg rest and seat. When tilting the backrest, the seat is raised at the front, resulting in a small step between the seat and the legrest, provided that the legrest and the seat each have their own padding.

For lamination of the step, the chair may have a continuous pad extending from a rear end of the seat to a front end of the leg rest. At the transition from the seat to the leg rest, this cushion deforms as soon as the seat is raised in front by adjusting the backrest. The height difference between the leg rest and the seat is compensated in the area of the step by shearing the corresponding pad section. It results in there from the leg rest to the seat slightly rising upholstery section.

Figur 1

ein erfindungsgemäßes Sitzmöbel in Grundstellung, mit horizontal angeordnetem Sitz und sich vertikal erstreckender Rückenlehne in Seitenansicht und schematischer Darstellung;

Figur 2

das Sitzmöbel aus Figur 1 in Neigestellung, mit geneigtem Sitz und geneigter Rückenlehne;

Figur 3

den Koppelbeschlag aus den Figuren 1, 2 mit Abdeckplatte in perspektivischer Ansicht in verschiedenen Stellungen (Fig. 3a - 3c);

Figur 4

den Koppelbeschlag gemäß Figur 3 in Seitenansicht (Fig. 4a - 4c);

Figur 5

das Sitzmöbel gemäß den Figuren 1, 2, ausgestattet mit einer Gasdruckfeder, in Grundstellung (Fig. 5a) und in Neigestellung (Fig. 5b); und

Figur 6

eine Variante des Sitzmöbels gemäß Figur 5, mit einer vor dem Sitz angeordneten Beinauflage, in Grundstellung (Fig. 6a) und in Neigestellung (Fig. 6b).

The invention will be explained in more detail with reference to an embodiment shown in the drawing. Further features of the invention result from the following description of the embodiment of the invention in conjunction with the claims and the accompanying drawings. The individual features of the invention may be implemented on their own or in several different embodiments of the invention. Show it:

FIG. 1

an inventive seating in basic position, with horizontally arranged seat and vertically extending backrest in side view and schematic representation;

FIG. 2

the seating FIG. 1 in tilt position, with reclined seat and inclined backrest;

FIG. 3

the coupling fitting from the FIGS. 1, 2 with cover plate in perspective view in different positions ( Fig. 3a - 3c );

FIG. 4

according to the coupling fitting FIG. 3 in side view ( Fig. 4a - 4c );

FIG. 5

the seating according to FIGS. 1, 2 , equipped with a gas spring, in basic position ( Fig. 5a ) and in a tilted position ( Fig. 5b ); and

FIG. 6

a variant of the chair according to FIG. 5 , with a leg rest in front of the seat, in basic position ( Fig. 6a ) and in a tilted position ( Fig. 6b ).

The FIGS. 1, 2 show an embodiment of the seat 1 according to the invention in the form of a single-seat. The seating 1 is shown without upholstery, without side panels and without feet, so that the essential functional parts are clearly visible. The chair 1 has a support frame 2, on which a rear height-adjustable seat 3 and a reclining backrest 4 are arranged. The seat 3 is pivotable about a horizontal pivot axis 5, which is close to a front edge 6 of the seat 3 and a front edge 7 of Support frame 2 is arranged. The chair 1 has a coupled backrest and seat adjustment, which allows a synchronous adjustment of the seat 3 by the backrest 4 with a change in inclination of the backrest 4. For this purpose, the backrest 4 is connected via a coupling fitting 8 with the seat 3 and with the support frame 2 tilted. The coupling fitting 8 moves the seat 3 at a tilt adjustment of the backrest 4 back up or down.

The FIG. 1 shows the chair 1 in basic position, with a horizontally arranged seat 3 and a substantially vertically extending backrest 4. Die FIG. 2 shows the corresponding chair 1 in tilt position, with a tilted seat 3 and a reclined backrest. 4

The coupling fitting 8 has a four-link four-bar linkage 9 and a two-part toggle linkage 10, which are mechanically coupled together. The four-bar linkage 9 connects backrest 4 and seat 3, the toggle mechanism 10, backrest 4 and support frame 2 movable together. The four-bar linkage 9 comprises four strut-like coupling members 11, 12, 13, 14 which are rotatably mounted at four hinge points 15, 15 '. The coupling members 11, 12, 13, 14 are formed differently long in this embodiment and form a non-uniform square. The coupling member 11 is connected to the backrest 4 and the coupling member 11 opposite coupling member 12 fixed to the seat 3. The rear coupling member 11 is bolted to the backrest. The freely movable coupling members 13, 14 connect the coupling members 11, 12 with each other. The seat 3 associated coupling member 12 has in the direction of the seat 3, a lateral extension 16 on which an L-shaped fastening member 17 is rigidly mounted. The fastening part 17 is screwed to the seat 3.

The toggle mechanism 10 holds two strut-like lever members 18, 19, which are rotatably mounted at two pivot points 20, 20 '. The two lever members 18, 19 are of different lengths and pivotally connected to each other. The longer lever member 18 is formed by the lower coupling member 14, that for this purpose has an extension 21 which extends angled straight away from the coupling member 14 and of the four-bar linkage 9. The short lever member 19 of the toggle mechanism 10 is pivotally connected to a rear edge 22 of the support frame 2 via a base part 34. The long lever member 18 is pivotally connected via the rear coupling member 11 with a lower end 23 of the backrest 4. The two lever members 18, 19 are connected to one another at a pivot point 20 "In the basic position, the seat 3 extends parallel above on the support frame 2, so that the rear edge 24 of the seat 3 has a height distance to the rear edge 22 of the support frame 2. In the illustrated tilt position, the seat 3 is lowered so far back that the seat 3 is supported with its rear edge 24 at the rear edge 22 of the support frame 2.

When pivoting the backrest 4 to the rear, the freely movable coupling members 13, 14, which are not attached to the seat 3 and the backrest 4, move backwards downwards, so that the backrest 4 is lowered. With the lower end 23 of the backrest 4, the trailing edge 24 of the seat 3 is simultaneously moved downward. At the same time, the pivot point 20 "moves upwards in the direction of the rear edge 24 of the seat 3 and of the extension 16 of the coupling element 12. The lateral distance between the coupling links 11, 12 is reduced when the backrest 4 is raised from the tilted position to the home position in each case an opposite movement takes place.

The FIGS. 3a to 3c show the coupling fitting 8 enlarged in perspective view. This one is in the FIG. 3a in an upper end position, ie shown in the basic position. The Figure 3c shows the coupling fitting 8 in a lower end position, ie in the largest possible tilt position. In the figure 3d an intermediate position is shown. The coupling fitting 8 has a cover 25 which completely covers the coupling members 11, 13, 14 and the lever members 18, 19.

The FIGS. 4a to 4c show the respective positions of the four-bar mechanism 9 and the toggle mechanism 10 in side view. The in the FIG. 3 concealed coupling links 11, 13, 14 and lever members 18, 19 are shown in dashed lines and completely visible. Of the FIG. 4 It can be seen that the coupling member 12 provided for connection to the seat 3 is laterally enlarged such that it forms the cover 25 of the coupling fitting 8.

The FIG. 5 shows that in the FIGS. 1, 2 shown inventive seating 1, equipped with a gas spring 26. The gas spring 26 is rotatably connected to the backrest 4 and the support frame 2. It engages the backrest 4 remote from the coupling fitting 8 on a frame part 27. On the support frame 2, it is fastened together with the short lever member 19 of the toggle mechanism 10 directly to the rear edge 22. The gas spring 26 is disposed inclined relative to the support frame 2, the seat 3 and the backrest 4 and is tensioned when moving the backrest 4 away from the basic position. It may already be biased in the basic position. The gas spring 26 supports the erection of the backrest 4 from any rear tilt position to the upright basic position. For this purpose, the gas spring 26 has means 28 for automatic locking and manual unlocking, wherein the unlocking means can be actuated for example via a Bowden cable not shown in the drawing. The FIG. 5a shows the chair 1 in basic position with relaxed unlocked gas spring 26, the FIG. 5b in tilt position with tensioned and locked gas spring 26.

The FIG. 6 shows a variant of the embodiment described above completely. Before the padded seat 3, a leg rest 29 is arranged, which is not adjustable. This is connected to the support frame 2, wherein a pad 30 extends from the trailing edge 24 of the seat 3 continuously up to the seat 3 remote free end 31 of the leg rest 29. The padding points in the in the FIG. 6a shown basic position on a smooth transition from the leg rest 29 to the seat 3. When tilting the backrest 4 is how out of the FIG. 6b can be seen, the seat 3 is raised front, so that a small step 32 between the leg rest 29 and the seat 3 results. At a transition 33 from the seat 3 to the leg rest 29, the pad 30 is deformed to conceal the step 32. In this case, the pad 30 is deformed at this point by shearing perpendicular to the seat 3 and to the leg rest 29 and compensates for the difference in height in the region of the transition 33.

Claims (13)

Seating furniture (1), in particular upholstered furniture, with a support frame (2) on which a rear height-adjustable seat (3) and a reclining backrest (4) are arranged, wherein the seat (3) about a horizontal pivot axis (5) on the support frame (5) 2) is pivotable and the backrest (4) via a coupling fitting (8) with the seat (3) and the support frame (2) is tiltably connected, and wherein the seating (1) has a coupled backrest and seat adjustment and the coupling fitting ( 8) moves the seat (3) upwards or downwards when the backrest (4) is tilted, characterized in that the coupling fitting (8) has a four-link four-bar linkage (9) and a two-link toggle linkage (10), the four-bar linkage (9) backrest (4) and seat (3) and the toggle mechanism (10) backrest (3) and support frame (2) connects to each other movable. Seating furniture according to claim 1, characterized in that the four-bar linkage (9) has two rear pivot points (15) fixedly connected to the backrest (4) and two front pivot points (15 ') integral with the seat (3). Seating furniture according to claim 1 or 2, characterized in that the toggle mechanism (10) has a fixed to the backrest (4) rear pivot point (20), a fixed to the support frame (2) connected front pivot point (20 '). Seating furniture according to one of the preceding claims, characterized in that the four-bar linkage (9) and the toggle mechanism (10) are mechanically coupled to each other directly. Seating furniture according to one of the preceding claims, characterized in that a lower coupling member (14) of the four-bar mechanism (9) which extends between the front lower hinge point (15 ') and the rear lower hinge point (15) of the four-bar mechanism (9) over the front lower hinge point (15 ') is further extended by an extension (21) and forms a long lever member (18) of the toggle mechanism (10). Seating furniture according to claim 5, characterized in that the lower coupling member (14) angled away from the four-bar linkage (9) pointing straight, extending extension (21) which is rotatably connected to the long lever member (18) of the toggle mechanism (10). Seating furniture according to one of the preceding claims, characterized in that the four-bar linkage (9) has a front relative to the backrest (4) movable coupling member (12) with a lateral extension (16) on which a preferably L-shaped fastening part (17) for the seat (3) is arranged. Seating furniture according to one of the preceding claims, characterized in that the coupling fitting (8) has a lateral cover plate (25) which engages over the four-bar linkage (9) and the toggle mechanism (10). Seating furniture according to one of the preceding claims 1 to 7, characterized in that the front coupling member (12) as a cover plate (25) is formed, the other coupling members (11, 13, 14) of the four-bar mechanism (9) and the lever members (18, 19) of the toggle mechanism (10) overlaps. Seating furniture according to one of the preceding claims, characterized in that between the support frame (2) and the backrest (3) a rotatably connected gas pressure spring (26) which is inclined relative to the support frame (2) and the backrest (3) is arranged and tense when tilting the backrest (3). Seating furniture according to claim 10, characterized in that the gas pressure spring (26) has means (28) for locking and unlocking. Seating furniture according to one of the preceding claims, characterized in that in front of the seat (3) a preferably non-adjustable leg support (29) is fixedly arranged with the support frame (2). Seating furniture according to claim 12, characterized in that the seating furniture (3) comprises a pad (30) extending from a trailing edge (24) of the seat (3) to a front free end (31) of the leg rest (29).

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