DE20114562U1 - Rotary fitting for an adjustable piece of furniture, in particular for a piece of seating - Google Patents

Description

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FUCHS MEHLER WHITE &'FRlTZSCHE"''

WIESBADEN - MUNICH - ALICANTE

Schi 8546-Gbm/ks

Rotating bracket for an adjustable Furniture, especially for seating

European Patent Attorneys European Trademark Attorneys

Office Munich

Dr. Thomas M. Fritzsche Dipl.-Chem. and Biologist

Naupliastrasse 110 D-81545 Munich

Telephone: 089/5 23 17 09 Fax: 089/52 24 05

e-mail: fuchs-pat@t-online.de

Dr. Ing. Jürgen H. Fuchs

Dipl.-Ing., B. Com. Dr. rer.nat. Klaus Mehler

Dipl.-Phys. Dipl.-Ing. Christian Weiß

Dipl.-Ing. Kurt Müller Dipl.-Phys. Werner Witzel

Abraham-Lincoln-Strasse 7 D-65189 Wiesbaden

PO Box 46 60

D-65036 Wiesbaden Telephone: 0611/71 42-0 Fax: 0611/71 42-20

e-mail: fuchs-pat@t-online.de

Paseo Explanada de Espana No. 3. 5-dcha

ES-03002 Alicante Telephone: +34/96/5 20 01 34 Fax: +34/96/5 20 02 48

Willi Schillig Upholstered Furniture Works GmbH & Co. KG At the vineyard 20 - 22 96237 Ebersdorf-Frohnlach

VAT ID No./VAT REG No. DE 113895983

Postbank Munich Account 2403 67-806 (bank code 700 100 80)

Volksbank Freudenstadt Account 268 360 09 (bank code 642 910 10)

Willi Schi 11ig Polstermobelwerke GmbH & Co.KG
Ski 8546 - Gbm

Swivel fitting for an adjustable piece of furniture, especially for a seating piece

Description

The invention relates to a rotary fitting for an adjustable piece of furniture, in particular for an adjustable piece of seating furniture.

It is known from the prior art to assemble furniture from different furniture parts, which can then be adjusted relative to one another. For example, it is known to design a piece of seating furniture with a first seat and a second seat, with the two seats essentially lying in a common plane. In order to be able to adapt the seating furniture to different situations, for example to adapt the seating furniture to certain room geometries or to convert seating furniture into reclining furniture, the two pieces of furniture can be brought into different positions relative to one another. For this purpose, the furniture parts are coupled to one another via an adjustable rotary fitting.

However, conventional rotary fittings for realizing the adjustment function have various disadvantages.

For example, the furniture parts cannot be fixed in predetermined positions relative to one another using the swivel fitting, but are infinitely adjustable without counterforce and therefore undefined relative to one another, which can lead to unwanted tilting or jamming of the two furniture parts that can be moved relative to one another. Another point to consider when producing a swivel fitting is its manufacturing costs, which lead to

Minimizing furniture costs must be kept accordingly low.

It is therefore an object of the present invention to provide a rotary fitting of the type described above, which has a high level of functionality and ease of use while being inexpensive to manufacture.

This object is achieved by a rotary fitting for an adjustable piece of furniture, in particular for a piece of seating furniture, comprising a first rotary fitting component for attachment to a first furniture part, a second rotary fitting component for attachment to a second furniture part that is adjustable relative to the first furniture part, and a tension spring which pretensions the first rotary fitting component towards the second rotary fitting component with a spring force, wherein the first rotary fitting component is rotatable and displaceable relative to the second rotary fitting component while overcoming the spring force of the tension spring to bring about at least one predetermined angular position.

By providing two rotary fitting components that are clamped together by a tension spring and can be rotated and displaced relative to each other by overcoming the spring force of the tension spring, it can be ensured that the two rotary fitting components only move relative to each other when one of these rotary fitting components is attacked with a sufficiently large adjustment force. In addition, it is possible to allow the displacement of the two rotary fitting components attached to the furniture parts to take place in a defined manner relative to each other, since the tension spring counteracts any undesirable tilting or inclination of the two furniture parts relative to each other. Overall, this results in a simple

operable rotating fitting, which is cost-effective to produce.

In a further development of the invention, it can be provided that the first rotary fitting component and the second rotary fitting component can be locked in at least one predetermined angular position relative to one another. This measure makes it easier to define the predetermined angular positions. This makes it possible to align the two furniture parts that can be adjusted relative to one another in specific angular positions relative to one another. For example, in a piece of seating furniture with two seats, the two seats can be brought into positions in which they are aligned with one another or are positioned orthogonally to one another.

The locking of the two rotary fitting components in at least one predetermined angular position relative to one another can be achieved in that the first rotary fitting component has at least one locking means, that the second rotary fitting component has at least one corresponding counter-locking means and that the locking means and the counter-locking means determine the at least one predetermined angular position in a locked state.

In one embodiment of the invention, in order to provide the locking means, it can be provided that the locking means comprises a cam plate with at least one cam region and that the counter-locking means comprises a receiving plate with at least one cam receiving region, wherein the cam region and the cam receiving region have complementary edge contours and are in mutual contact in the at least one angular position. This structural design enables the locking to be reliably implemented in predetermined angular positions, whereby the structural effort is relatively low.

is held and the rotary fitting according to the invention therefore remains cost-effective to manufacture. According to the invention, the edge contour can also be provided with a round, preferably circular shape. This also counteracts tilting and promotes a defined movement of the two furniture parts relative to one another.

When implementing the locking means, it can be provided that at least two rotational positions are provided, wherein the cam plate comprises at least two cam regions which are angularly offset from one another in a rotational plane and which, depending on the angular position, interact with the receiving region of the receiving plate to lock the first and second rotary fitting components. It is of course also possible to design the cam plate with more than two cam regions which are angularly offset from one another. The angles by which the cam plate has cam regions offset from one another can be selected depending on the desired predetermined angular positions. If you want to have two mutually orthogonal angular positions, the angular offset is 90°, for example. However, any angle can be selected which is in an angular range between 0 and 180°.

Alternatively, a rotary fitting can be provided in which at least two rotary positions are provided, wherein the receiving plate comprises at least two cam receiving areas which are angularly offset from one another in a plane of rotation and which, depending on the angular position, interact with the cam area of the cam plate to lock the first and second rotary fitting components. In this embodiment, instead of a plurality of cam areas which are angularly offset from one another, a plurality of receiving areas which are angularly offset from one another are provided. Otherwise _, the functionality and the possibility for

different configurations are possible, just like in the solution described above.

In order to ensure that the rotary fitting according to the invention is sufficiently stable, it can be provided that the first rotary fitting component comprises a support frame, preferably made of square steel elements, to which the first furniture part can be attached. This measure ensures that the rotary fitting can absorb the adjustment forces acting on it during adjustment and can pass them on to the first furniture part. It can also be provided that the support frame is designed, preferably by support legs, to support the first furniture part on a base. This makes it possible to divert the forces acting on the support frame, in particular when adjusting the two rotary fitting components relative to one another, not only into the first furniture part, but also via the support legs to the base, for example a floor or the like.

In order to ensure a more defined adjustment movement and to be able to better exclude the two rotary fitting components from tilting relative to each other, the invention can further provide that the support frame has guide means, preferably

Guide rails for guiding the movement of the second rotary fitting component relative to the first rotary fitting component. The provision of guide means allows the linear displacement and the rotary movement of the second rotary fitting component relative to the first rotary fitting component to be guided safely even under the action of the spring force of the tension spring and under the action of the adjustment force exerted by a person adjusting the furniture. The guide rails can be formed on the support frame and also be formed from square steel elements. To provide a corresponding

In the counter-guide means, it can further be provided that the second rotary fitting component is assigned a guide shaft which can be displaced along the guide means and about which the second rotary fitting component can rotate. The guide shaft can be guided in the guide rails in such a way that the second rotary fitting component can be displaced linearly via the guide shaft and the guide rails, wherein the guide shaft is also rotatably mounted within the guide rails.

In order to guarantee a secure and stable coupling of the rotary fitting and the second furniture part in terms of force transmission, it can be provided that the second rotary fitting component has at least one cantilever arm for attachment to the second furniture part. This makes it possible to transfer the adjustment forces exerted on the second furniture part via the cantilever arm - possibly using a lever effect - to the second rotary fitting component and thus to allow safe operation of the rotary fitting according to the invention. If we refer again to the previous embodiment of the rotary fitting according to the invention designed with a cam plate, it can also be provided that the at least one cantilever arm is attached to the cam plate.

With regard to the tension spring, it can be provided that it is tensioned between the first rotary fitting component and the second rotary fitting component. If we refer again to the previous embodiment with guide shaft and support frame, it can be provided that the tension spring is locked at one end to the guide shaft and the other end to the support frame.

The invention further relates to a piece of furniture, in particular a piece of seating furniture, with a first piece of furniture and a second piece of furniture pivotable relative to the first piece of furniture, wherein the first

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The first furniture part and the second furniture part are coupled to one another via a rotary fitting of the type described above. In such a piece of furniture, it can be provided that the first furniture part comprises a first seat cushion provided with a backrest and that the second furniture part comprises an elongated second seat cushion, wherein the second seat cushion can be displaced by means of the rotary fitting between a first angular position in which it is substantially aligned with the first seat cushion and a second angular position in which it is substantially orthogonal to the first seat cushion, and can be fixed in these angular positions.

The invention is explained below by way of example with reference to the accompanying figures. They show:

Figure 1 is a perspective view of a rotary fitting according to the invention from above;

Figure 2 is a front view of the rotary fitting according to the invention viewed in direction Y according to Figure 1;

Figure 3 is a perspective view of the rotary fitting according to the invention from below;

Figure 4 shows a seating furniture according to the invention in a first angular position;

Figure 5 shows a seating furniture according to the invention in a second angular position;

Figures 6a to 6d show a schematic representation of the

inventive rotary fitting according to Figures 1 to 3 when shifted from a

first predetermined angular position into a

second predetermined angular position.

In Figures 1 to 3, a rotary fitting according to the invention is generally designated by 10. This comprises a first rotary fitting component 12 and a second rotary fitting component 14. The first rotary fitting component 12 comprises a support frame which is formed from various square profiles 16, 18, 20, 22. The square profiles 16, 18 run in the X direction and are connected via the square profiles 20, 22, which run orthogonally to them in the Y direction. Guide profiles 24, 26 running parallel to the square profiles 16 and 18 are arranged between the square profiles 20, 22 and are held at a predetermined distance from one another via spacers 28, 30.

Feet 32, 34, 36, 38 are provided on the underside of the square profiles 16 and 18 running in the X direction, with height-adjustable support elements 40, 42 arranged on the feet 36 and 38 via adjusting screws in order to support the support frame of the first rotary fitting component 12 on a base. The height-adjustable support elements 40, 42 serve to compensate for unevenness on the base. Spacer elements 44, 46 are provided on the top side of the two square profiles 16 and 18, which serve to connect the square profiles 16, 18 to a piece of furniture not shown in Figures 1 to 3 and in doing so come into contact with the underside of the piece of furniture with their free ends.

Approximately in the middle of the square profiles 16, 18, viewed in the X direction, a rectangular profile 48 is attached to the upper side thereof, which carries a circular segment-shaped cam plate 50, which extends essentially in a plane parallel to the X and Y directions. _% The circular segment-shaped cam plate 50 rests with its straight contour section 52 on the rectangular profile 48 and is fastened to it. With its circular section-shaped contour section 52 ₂ , the

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the cam plate 50 in Fig. 1 and 3 in the direction to the right. Furthermore, the cam plate 50 rests with its lower base on the top of the guide profiles 24 and 26 and is fastened to them. As a result, the cam plate 50 is firmly connected to the support frame of the first rotary fitting component 12 formed from the individual square profiles 16 to 22 and the guide profiles 24 to 26.

It should be noted that an eyelet element 54 is attached, preferably welded, to the underside of the square profile 20, to which one end of a tension spring 55 (see Figure 2) is fixed.

In addition to the first rotary fitting component 12 described above, the rotary fitting 10 comprises - as already indicated above - the second rotary fitting component 14. This comprises a receiving plate 56 in which two receiving areas are provided which are complementary to the circular contour section 52 ₂ of the cam plate 50 and have complementary contour edges 58, 60. The cam plate 56 has a substantially rectangular envelope. Approximately in the center of this rectangle, the cam plate 56 is penetrated by a shaft screw 62, which is stabilized in position on its top with a washer 64 and which is provided at its other end with a locking plate 66, another washer 68 and a pair of nuts 70, 72 such that the cam plate can be moved and rotated between the guide profiles 24, 26 guided by the shaft screw 62, but is secured against movement parallel to the Z direction. A further receiving eyelet 74 is inserted between the two nuts 70, 72 to receive the other end of the tension spring 55 (see Figures 2 and 3).

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Two cantilever arms 76, 78 are attached to the top of the cam plate 56 and are designed to attach the second rotary fitting component 14 to a second furniture part. The cantilever arms 76, 78 are attached to the second furniture part via attachment elements 80, 82, 84, 86, which are each attached to the free ends of the cantilever arms 74, 76 designed as rectangular profiles in Figure 1, pointing upwards parallel to the Z direction.

As can be seen in particular from Figure 1, the rotary fitting 10 in Figures 1 to 3 is in a first predetermined angular position in which the cam plate 50 lies in a receiving area of the receiving plate 56, wherein the circular contour section 52 ₂ of the cam plate 50 is in contact with the complementary contour edge 58 of the receiving plate 56. The two rotary fitting components 12 and 14 are held in this position by the tension spring 55, which pre-tensions the two rotary fitting components 12 and 14 towards each other in accordance with the arrows F ₁ and F ₂ in Figure 2.

A displacement of the two rotary fitting components 12 and 14 for transferring the rotary fitting 10 according to the invention into a second angular position in which the cam plate 50 penetrates into the other receiving area with the contour edge 60 is discussed in detail below with reference to Figures 6a to 6e.

First, however, a possible application for the rotary fitting 10 will be described with reference to Figures 4 and 5. Figure 4 shows a piece of seating furniture 7 9 with a first seat 80, a second seat 82 and a third seat 84. The first seat 80 is assigned to a first furniture part 86, to which an angled backrest 88 is attached. The two seat surfaces 82 and 84 are assigned to a second furniture part 90, which is pivotable relative to the first furniture part 86.

is adjustable. To support the seating furniture 79 on a surface, support elements 92 or support rollers 94 are attached to the undersides of the two furniture parts 86 and 90. In order to be able to move the seating furniture from the position shown in Figure 4 to the position shown in Figure 5, the first furniture part 86 and the second furniture part 88 are connected to one another via the rotary fitting described with reference to Figures 1 to 3. In the positions shown in Figures 4 and 5, the two furniture parts 86 and 88 are locked to one another and can only be moved out of these predetermined angular positions with increased effort. In Figure 4, the seat surfaces 80, 82 and 84 are aligned with one another. In Figure 5, the seat surfaces 80 and the seat surfaces 82 and 84 are orthogonal to one another.

With reference to Figures 6a to 6e, it is now described how the rotary fitting 10 behaves when it is moved from one position according to Figures 1 to 3 into the other angular position.

In Figure 6a, the rotary fitting 10 is in the first angular position according to Figures 1 to 3. The cantilever arms 76 and 78 are essentially orthogonal to the square profiles 16 and 18, wherein the cam plate 50 engages in the receiving area of the receiving plate 56 and the circular contour section 52 ₂ rests against the corresponding contour edge 58. If a force F ₃ now acts on the cantilever arms in order to rotate the second rotary fitting component 14 relative to the first rotary fitting component 12, this leads to the edge 92 of the receiving plate 56 sliding on the circular contour section 52 ₂ of the cam plate 50, wherein the receiving plate 56 rotates about the shaft screw 62, as shown by a rotation arrow P ₁ , and wherein the cam plate moves linearly, guided by the guide profiles 24 and 26 not shown in Figures 6a to 6e, as shown by an arrow P ₂ .

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This combined rotary and linear movement continues, whereby in an intermediate stage the position according to Figure 6c is reached, in which the cam plate 56 continues to rotate around the shaft screw 62 under the action of the force F ₃ . The linear movement at this point is equal to 0 in terms of amount, since the edge 92 has reached the point on the far right in Fig. 6b of the circular contour section 52 ₂ of the cam plate 50.

If the cam plate 56 continues to rotate due to the force

the edge 92 slides further on the

circular contour section 52 ₂ , wherein the cam plate 56 moves again overall to the left in Figure 6d according to arrow P ₃ .

Finally, the state according to Figure 6e is reached, in which the cam plate 50 engages in the receiving area of the receiving plate 56, wherein the circular section-shaped contour section 52 ₂ of the cam plate 50 is in mutual contact with the contour edge 60 of the receiving area of the receiving plate 60. The cantilever arms 76 and 78 are essentially parallel to the two square profiles 16 and 18 of the first rotary fitting component 12. In Figure 6e, the second predetermined angular position is thus reached.

It should be noted that when the rotary fitting 10 according to the invention is transferred from the position according to Figures 1 to 3 or Figure 6a to the position according to Figure 6e, the two rotary fitting components 12 and 14 are permanently pre-tensioned to one another by means of the tension spring (not shown) (see Figure 2). In order to effect the shift from the state according to Figure 6a to the state according to Figure 6e, only a sufficiently large force F ₃ must act on the extension arms 76 and 78. The rest is achieved by leverage and by the edge 92 sliding along the circular section.

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Contour section 52 ₂ of the cam plate 50. The two rotary fitting components 12 and 14 then automatically engage in the predetermined angular positions under the force of the tension spring 55.

It should also be noted that the cam plate can also be designed with a polygonal envelope instead of with a square envelope as shown, wherein a receiving area with a corresponding circular section-shaped contour edge can be formed on each polygon side, so that more than two mutually orthogonal angular positions can be achieved.

Finally, it should be noted that by means of a force F ₄ shown in dashed lines in Figure 6e, the two rotary fitting components 12 and 14 can be transferred back, ie via the stations according to Figures 6d to 6b, into the angular position according to Figure 6a.

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List of reference symbols;

10 18, 20, 22 Rotating fitting 12 26 first rotary fitting component 14 30 second rotary fitting component 16, 34, 36, 38 Square profile 24, 42 Leadership profile 28, 46 Spacer 32, Foot 40, height-adjustable support element 44, Spacer element 48 Rectangular profile 50 Cam plate 52, straight contour section 52 ₂ circular contour section 54 60 Eyelet element 55 Tension spring 56 Mounting plate 58, Contour edge 62 Shaft screw 64 72 Washer 66 Locking plate 68 78 Washer 70, Mother 74 82, 84 Mounting eyelet 76, Boom arm 79 Furniture 80, Seat 86 first piece of furniture 88 _F2 - _F3 - _F4 backrest 90 P ₃ ' P, second piece of furniture 92 Edge _F1 , Forces _P1 - Movement directions

Claims (17)

1. Pivoting fitting ( 10 ) for an adjustable piece of furniture ( 79 ), in particular a piece of seating furniture ( 79 ), comprising: - a first rotary fitting component ( 12 ) for attachment to a first furniture part ( 86 ), - a second rotary fitting component ( 14 ) for attachment to a second furniture part ( 90 ) adjustable relative to the first furniture part ( 86 ) and - a tension spring ( 55 ) which prestresses the first rotary fitting component ( 12 ) towards the second rotary fitting component ( 14 ) with a spring force (F ₁ , F ₂ ), wherein the first rotary fitting component ( 12 ) is rotatable and displaceable relative to the second rotary fitting component ( 14 ) by overcoming the spring force (F ₁ , F ₂ ) of the tension spring ( 55 ) to bring about at least one predetermined angular position. 2. Pivoting fitting ( 10 ) according to claim 1, wherein the first pivoting fitting component ( 12 ) and the second pivoting fitting component ( 14 ) can be locked in the at least one predetermined angular position relative to one another. 3. Pivoting fitting ( 10 ) according to claim 2, wherein the first pivoting fitting component ( 12 ) has at least one locking means ( 50 ), wherein the second pivoting fitting component ( 14 ) further has at least one corresponding counter-locking means ( 56 ), and wherein the locking means ( 50 ) and the counter-locking means ( 56 ) determine the at least one predetermined angular position in a locked state. 4. Pivoting fitting ( 10 ) according to claim 3, wherein the locking means comprises a cam plate ( 50 ) with at least one cam region ( 52 ₂ ) and wherein the counter-locking means comprises a receiving plate ( 56 ) with at least one cam receiving region, wherein the cam region and the cam receiving region have complementary edge contours ( 52 ₂ , 58 , 60 ) and are in mutual contact in the at least one angular position. 5. Pivoting fitting ( 10 ) according to claim 4, wherein the edge contour ( 52 ₂ , 58 , 60 ) has a round, preferably circular, profile. 6. Pivoting fitting according to claim 4 or 5, in which at least two rotational positions are provided, wherein the cam plate comprises at least two cam regions which are angularly offset from one another in a plane of rotation and which, depending on the angular position, cooperate with the receiving region of the receiving plate for locking the first and second pivoting fitting components. 7. Pivoting fitting ( 10 ) according to claim 4 or 5, in which at least two rotational positions are provided, wherein the receiving plate ( 56 ) comprises at least two cam receiving regions ( 58 , 60 ) which are angularly offset from one another in a plane of rotation and which, depending on the angular position, cooperate with the cam region ( 52 ₂ ) of the cam plate ( 50 ) for locking the first ( 12 ) and second ( 14 ) pivoting fitting components. 8. Pivoting fitting ( 10 ) according to one of the preceding claims, wherein the first pivoting fitting component ( 12 ) comprises a support frame, preferably made of square steel elements ( 16 , 18 , 20 , 22 ), to which the first furniture part ( 86 ) can be attached. 9. Pivoting fitting ( 10 ) according to claim 8, wherein the support frame ( 16 , 18 , 20 , 22 ) is preferably designed with support legs ( 32 , 34 , 36 , 38 ) for supporting the first furniture part ( 86 ) on a base. 10. Pivoting fitting ( 10 ) according to claim 8 or 9, wherein the support frame ( 16 , 18 , 20 , 22 ) has guide means ( 24 , 26 ), preferably guide rails, for guiding the movement of the second pivoting fitting component ( 14 ) relative to the first pivoting fitting component ( 12 ). 11. Pivoting fitting ( 10 ) according to claim 10, wherein the second pivoting fitting component ( 14 ) is associated with a guide shaft ( 62 ) which is displaceable along the guide means ( 24 , 26 ) and about which the second pivoting fitting component ( 14 ) is rotatable. 12. Pivot fitting ( 10 ) according to one of the preceding claims, wherein the second pivot fitting component ( 14 ) has at least one cantilever arm ( 76 , 78 ) for attachment to the second furniture part ( 90 ). 13. Pivot fitting ( 10 ) according to claim 4 and claim 11, wherein the at least one cantilever arm ( 76 , 78 ) is attached to the cam plate or to the receiving plate ( 50 ). 14. Pivoting fitting ( 10 ) according to one of the preceding claims, wherein the tension spring ( 55 ) is tensioned between the first pivoting fitting component ( 12 ) and the second pivoting fitting component ( 14 ). 15. Pivoting fitting ( 10 ) according to claim 10, 11 and 14, wherein the tension spring ( 55 ) is locked at one end to the guide shaft ( 62 ) and at the other end to the support frame. 16. Furniture ( 79 ), in particular seating furniture ( 79 ), with a first furniture part ( 86 ) and a second furniture part ( 90 ) pivotable relative to the first furniture part, wherein the first furniture part ( 86 ) and the second furniture part ( 90 ) are coupled via a rotary fitting ( 10 ) according to one of the preceding claims. 17. Furniture ( 79 ) according to claim 16, wherein the first furniture part ( 86 ) comprises a first seat cushion ( 80 ) provided with a back support ( 88 ) and wherein the second furniture part ( 90 ) comprises an elongated second seat cushion ( 82 , 84 ), wherein the second seat cushion ( 82 , 84 ) can be displaced by means of the rotary fitting ( 10 ) between a first angular position ( Fig. 4), in which it is substantially aligned with the first seat cushion ( 80 ), and a second angular position ( Fig. 5), in which it is substantially orthogonal to the first seat cushion ( 80 ), and can be fixed in these angular positions.