Chassis for a piece of seating furniture

Abstract

The invention relates to a chassis (1; 18) for a piece of seating furniture, comprising a seat surface holder (3), a lifting mechanism and a stand element (2), wherein the seat surface holder (3) is connected to the stand element (2) via the lifting mechanism, wherein the stand element (2) is designed to stand on a flat surface, wherein the lifting mechanism is designed to transfer the seat surface holder (3) from a lowered position into a raised position and vice versa, wherein the lifting mechanism is designed to incline the seat surface holder (3) during this transfer, wherein the lifting mechanism comprises a parallelogram mechanism, wherein the parallelogram mechanism comprises a first arm (5) and a second arm (6), wherein the arms (5; 6) are designed to be swivelled relative to one another during the transfer, wherein the first arm (5) has first tooth elements (14), wherein the second arm (6) has second tooth elements (15), wherein the first tooth elements (14) and the second tooth elements (15) engage with one another.

Description

Seating furniture chassis

[0001] The present invention relates to a seating furniture chassis according to claim 1.

[0002] Prior art includes seating furniture chassis with a lifting mechanism that raises and tilts the seat support. This simplifies getting up from a seat attached to the support, especially for elderly and / or infirm individuals. The seat support can, for example, be raised and tilted forward to facilitate standing. For a comfortable sitting position, the seat support can be lowered and aligned straight or even tilted backward.

[0003] In contrast, the invention is based on the objective of creating a seating furniture chassis with an improved lifting mechanism.

[0004] This problem is solved by a seating furniture chassis according to claim 1. Embodiments of the invention are specified in the dependent claims.

[0005] The seating furniture chassis comprises a seat support, a lifting mechanism, and a stand. For the purposes of this description, the seat support is understood to be, in particular, a bracket to which a seat of a piece of seating furniture can be attached. When attached to the seat support, the seat is immovable relative to the support. The seat support is connected to the stand via the lifting mechanism. The stand is designed to rest on a flat surface. The lifting mechanism is designed to move the seat support from a lowered position to a raised position and vice versa. The position of the seat support is relative to the base. In the raised position, the seat support is thus further away from the base than in the lowered position. The lifting mechanism is also designed to tilt the seat support during this transition. In particular, it is possible that the lifting mechanism is designed to tilt the seat support during the transition from the lowered to the raised position such that a rear portion of the seat support is higher than a front portion.

[0006] The lifting mechanism comprises a parallelogram mechanism. For the purposes of this description, this refers specifically to a mechanism that implements a parallelogram linkage. The parallelogram mechanism includes a first and a second arm. The arms are designed to pivot relative to each other during the transfer. The components referred to as arms in this description can, in particular, each be configured as a double arm of the parallelogram linkage.

[0007] The first arm has first tooth elements. The second arm has second tooth elements. For the purposes of this description, tooth elements are understood to be, in particular, a series of projections with notches arranged between them. The first and second tooth elements interlock, especially during the movement of the seat support. For the purposes of this description, this means, in particular, that the projections of the first tooth elements extend into the notches of the second tooth elements, and vice versa. The interlocking tooth elements are advantageous for preventing the arms from pivoting to the same extent relative to the To ensure the seat support and / or the base element is secure. This guarantees parallel movement of the parallelogram mechanism. This also allows for a particularly space-saving design of the parallelogram mechanism, especially in a transverse direction of the seating furniture chassis.

[0008] According to one embodiment of the invention, the parallelogram mechanism can comprise a third arm and a fourth arm. The third and fourth arms are designed to pivot relative to each other during the transition. The third arm has third toothed elements. The fourth arm has fourth toothed elements. The third and fourth toothed elements interlock during the transition of the seat support. The interlocking third and fourth toothed elements are advantageous for ensuring that the arms pivot to the same extent relative to the seat support and / or the base element. This ensures parallel movement of the parallelogram mechanism. In particular, this also enables a particularly space-saving design of the parallelogram mechanism, especially in a transverse direction of the seating furniture chassis.

[0009] It is particularly possible that the first, second, third, and fourth tooth elements are arranged at a rounded end of the respective arm. Each rounded end, together with its respective tooth elements, can also be referred to as a section of a gear.

[0010] According to one embodiment of the invention, the third arm can be pivotably connected to the first arm via a first joint connection. The fourth arm can be pivotally connected to the second arm via a second joint connection. In this description, a joint connection is understood to mean, in particular, that the components connected via the respective joint connection are pivotable relative to each other about a pivot axis defined by the joint connection. For example, the joint connection may include a bolt that protrudes through recesses in the respective arms and defines the pivot axis.

[0011] According to one embodiment of the invention, the first and second arms can be arranged above the third and fourth arms. This can be the case, in particular, during the intended use of the seating furniture chassis when the base is standing on a flat surface, such as a floor. It is especially possible for the first and second arms to be arranged above the third and fourth arms both in the raised position and in the lowered position of the seat support.

[0012] Within the scope of this description, the directions "up" and "down" are understood as they exist during the intended use of the seating furniture chassis when the base element is on a flat surface.

[0013] According to one embodiment of the invention, the distance between the first tooth elements and the second tooth elements from the third tooth elements and the fourth tooth elements in the raised position of the seat support can be greater than in the lowered position of the seat support.

[0014] According to one embodiment of the invention, the third arm can be pivotably connected to a stationary element of the seating furniture chassis via a third joint connection. The stationary element can be stationary, particularly when transferring the seat support.

[0015] According to one embodiment of the invention, the fourth arm can be pivotably connected to the stationary element via a fourth joint connection.

[0016] It is possible that the third joint and the third toothing are located in an end region of the third arm. For the purposes of this description, an end region is understood to be, in particular, a region that encompasses one end of the arm and comprises one-fifth or one-sixth of the arm's length. The end of the third arm may, in particular, be round, and the third toothing may be located at the rounded end of the third arm.

[0017] It is possible that the fourth joint and the fourth toothing are located in an end region of the fourth arm. The end of the fourth arm can be round, and the fourth toothing can be located at the rounded end of the fourth arm.

[0018] It is also possible that the first joint connection and the first toothing are located in an end region of the first arm. The end of the first arm can be round, and the first toothing can be located at the rounded end of the first arm.

[0019] It is also possible that the second joint and the second toothing are located in an end region of the second arm. The end of the second arm can be round, and the second toothing can be located at the rounded end of the second arm.

[0020] According to one embodiment of the invention, the lifting mechanism can include a threaded spindle designed to initiate the transfer. In particular, the threaded spindle can be designed to deform the parallelogram mechanism during the transfer by pivoting the arms relative to each other. The parallelogram mechanism can thereby increase the stability of the seat support in both the lowered and raised positions, as well as during the transfer.

[0021] It is possible that the threaded spindle has an upper end. A change in the position of the upper end can cause a change in the position of the seat support. This change in the position of the seat support can then be the transfer of the seat support.

[0022] The upper end of the threaded spindle can be located particularly close to the first and second toothed elements. This can apply to both the raised and lowered positions of the seat support. In this context, "close to" means, in particular, that the distance between the upper end of the threaded spindle and the first or second toothed elements is less than 10 cm.

[0023] According to one embodiment of the invention, the seating furniture chassis can comprise a housing arranged between the base and the parallelogram mechanism. The threaded spindle can have a lower end. In the lowered position of the seat support, this lower end can project into the housing. This is advantageous for a space-saving design of the lifting mechanism. Preferably, the housing is attached directly to the base, allowing the lower end of the threaded spindle to be positioned particularly low.

[0024] It is possible that the lower end of the threaded spindle protrudes further into the housing when the seat support is in the lowered position than when it is in the raised position. It is also possible that the lower end of the threaded spindle does not protrude into the housing when the seat support is in the raised position.

[0025] It is possible that the casing is hollow.

[0026] It is possible that the lifting mechanism includes a motor. The motor may be designed to rotate the threaded spindle. A thread of the threaded spindle may engage with a stationary engagement element, allowing the threaded spindle to move translationally when rotating. The stationary engagement element may be fixed relative to the support element. This may also be the case during the movement of the seat support.

[0027] It is possible that the motor is designed to be moved translationally when the seat base is transferred. For example, the motor may be fixed relative to the seat base.

[0028] According to one embodiment of the invention, the seating furniture chassis can comprise a first connecting element and a second connecting element. The first connecting element and the second connecting element can be positively connected to each other in the lowered position of the seat support. In particular, it is possible that, in the lowered position of the seat support, the second connecting element is at least partially arranged within the first connecting element. In the raised position of the seat support, the first connecting element can be located above the second connecting element. It is possible that the movement of the spindle during the transfer of the seat support from the lowered position to the raised position raises the first connecting element relative to the second connecting element.

[0029] It is advantageous that the first and second connecting elements are positively locked together in the lowered position of the seat support, as this increases the stability of the seating furniture chassis. This connection creates a force transmission between the swivel spindle and the seat support, as well as any lever mechanism that may be present. This relieves the arms and gear elements, as they have to transmit fewer forces. Forces acting on the seat support are transferred via the connecting elements to the swivel spindle and from there to the base element.

[0030] According to one embodiment of the invention, the second connecting element can be stationary during rotation of the threaded spindle.

[0031] It is possible that the second connecting element, in particular directly, is arranged above the third and fourth tooth elements. Furthermore, the second connecting element, in particular directly, can be arranged above the stationary element. It is also possible that the second connecting element is offset in a horizontal plane or direction from the third and fourth tooth elements.

[0032] According to one embodiment of the invention, the second connecting element can be conical and taper upwards. be designed. This is particularly advantageous for the stability of the seating furniture chassis and for the distribution of forces.

[0033] According to one embodiment of the invention, the seating furniture chassis can have a cover element that covers an area between the arms. In particular, it is possible for the third and fourth arms to be covered in their greatest extension. It is also possible for the cover element to cover both the area and the third and fourth toothed elements. In this description, the term "cover" is understood to mean, in particular, that a view of the area or of the covered components is significantly impeded or even prevented. The cover is advantageous for both optical and safety reasons, as it makes it more difficult, for example, to trap a finger between the arms or the toothed elements.

[0034] According to one embodiment of the invention, a lever mechanism can be articulated to both the first and second arms. The two lever mechanisms are designed to cause the tilting of the seat support during its movement. Due to the interlocking of the first toothed elements with the second toothed elements, and optionally also due to the interlocking of the third toothed elements with the fourth toothed elements, a synchronous tilting of the seat support on both sides is ensured.

[0035] According to one embodiment of the invention, the seating furniture chassis can include a safety guard. The safety guard can at least partially cover a gap that arises when the seat support is moved from the lowered position to the raised position. This is advantageous in order to reduce the risk of to reduce the risk of objects or body parts becoming trapped in this gap.

[0036] It is possible that the seat frame includes a projection and a bracket. The bracket may have several recesses. The projection can be positioned in one of these recesses when the seat support is in the lowered position. This is advantageous for fixing the seat in the lowered position and, above all, preventing rotation of the seat around a vertical axis.

[0037] It is possible that the recesses are arranged on a geometric circle. The circle can be centered on the threaded spindle. The threaded spindle can thus represent the center of the circle.

[0038] The invention further relates to a piece of seating furniture comprising a seating furniture chassis according to one embodiment of the invention and a seat surface attached to the seat support. The seat surface is immovable relative to the seat support.

[0039] Further features and advantages of exemplary embodiments of the invention are described below with reference to the drawings. The same reference numerals are used for identical or similar parts and for parts with identical or similar functions. The drawings show: Fig. 1 shows a schematic front view of a seating furniture chassis according to an embodiment of the invention with the seat support in the lowered position; Fig. 2 is a schematic perspective view of the seating furniture chassis from Fig. 1; Fig. 3 shows a schematic front view of the seating furniture chassis from Fig. 1 during the transfer of the seat support from the lowered position to the raised position; Fig. 4 is a schematic perspective view of the seating furniture chassis from Fig. 3; Fig. 5 shows a schematic front view of the seating furniture chassis from Fig. 3 during the transfer of the seat support from the lowered position to the raised position at a later time than in Fig. 3; Fig. 6 is a schematic perspective view of the seating furniture chassis from Fig. 5; Fig. 7 shows a schematic front view of the seating furniture chassis from Fig. 5 during the transfer of the seat support from the lowered position to the raised position at a later time than in Fig. 5; Fig. 8 is a schematic perspective view of the seating furniture chassis from Fig. 7; Fig. 9 shows a schematic front view of the seating furniture chassis from Fig. 1 with the seat support in the raised position; Fig. 10 is a schematic perspective view of the seating furniture chassis from Fig. 9; Fig. 1 1 a schematic perspective view of a seating furniture chassis according to an embodiment of the invention with a conical second connecting element with the seat support in the lowered position; Fig. 12 shows a schematic perspective view of the seating furniture chassis from Fig. 1 during the transfer of the seat support from the lowered position to the raised position; Fig. 13 shows a schematic perspective view of the seating furniture chassis from Fig. 12 during the transfer of the seat support from the lowered position to the raised position at a later time than in Fig. 12; Fig. 14 shows a schematic perspective view of the seating furniture chassis from Fig. 13 during the transfer of the seat support from the lowered position to the raised position at a later time than in Fig. 13. Fig. 15 shows a schematic perspective view of the seating furniture chassis from Fig. 14 with the seat support in the raised position; and Fig. 16 shows a schematic perspective view of the seating furniture chassis from Fig. 15 with a cover element.

[0040] It is not necessary for a device according to the invention to have all the features described below. It is also possible for a device according to the invention to have only individual features of the embodiment described below.

[0041] The seating furniture chassis 1 comprises a base element 2, a seat support 3, and a lifting mechanism. A seat can be attached to the seat support 3. For this purpose, the seat support 3 includes two separate sections, each of which can hold a lateral edge of the seat.

[0042] The lifting mechanism is designed to move the seat support 3 from a lowered position, shown in Figure 1, to a raised position, shown in Figure 10, and vice versa. The movement from the lowered position to the raised position is best understood by viewing Figures 1 to 10 in sequence. Viewing the figures in reverse order shows the movement from the raised to the lowered position.

[0043] The lifting mechanism comprises a first arm 5, a second arm 6, a third arm 8, and a fourth arm 7. Arms 5-8 form a parallelogram mechanism. Furthermore, the The lifting mechanism comprises two lever mechanisms 9. A first lever mechanism 9 connects the first arm 5 m to the seat support 3. A second lever mechanism 9 connects the second arm 6 m to the seat support 3. Furthermore, the lifting mechanism includes a motor 10 and a threaded spindle 13. In the lowered position of the seat support 3, the threaded spindle 13 projects into a housing 4 of the seating furniture chassis 1, which is located between the parallelogram mechanism and the base element 2.

[0044] The first arm 5 has first tooth elements 14 that engage with second tooth elements 15 of the second arm 6. The first arm 5 and the second arm 6 are pivotably connected to each other via the first tooth elements 14 and the second tooth elements 15.

[0045] The third arm 8 has third tooth elements 17 that engage with fourth tooth elements 16 of the fourth arm 7. The third arm 8 and the fourth arm 7 are pivotably connected to each other via the third tooth elements 17 and the fourth tooth elements 16.

[0046] The third arm 8 is also pivotally connected to the first arm 5 via a first joint connection 12 m. The fourth arm 7 is pivotally connected to the second arm 6 via a second joint connection 1 1.

[0047] To raise the seat support 3, the motor 10 sets the threaded spindle 13 into rotation. Since a fixed engagement element relative to the support element 2 engages in the thread of the threaded spindle 13, this rotation triggers a translational movement of the threaded spindle 13 upwards. In doing so, the threaded spindle 13 engages the motor 10, the seat support 3, the end section of the first arm 5 m with the first toothed elements 14, and the end section of the second arm 6 m with the second toothed elements. The end region of the third arm 8 m with the third tooth elements 17 and the end region of the fourth arm 7 m with the fourth tooth elements 16, however, remain stationary during the translational movement of the threaded spindle 13, so that the translational movement of the threaded spindle 13 pivots the first arm 5 relative to the third arm 8 and the second arm 6 relative to the fourth arm 7. During the translational movement of the threaded spindle 13, there is no translational movement of the first tooth elements 14 and the second tooth elements 15 in a horizontal direction.

[0048] The movements of the first arm 5 and the second arm 6 are synchronized due to the interlocking first tooth elements 14 and second tooth elements 15, so that the first arm 5 and the second arm 6 move in unison. Similarly, the movements of the third arm 8 and the fourth arm 7 are synchronized due to the interlocking third tooth elements 17 and fourth tooth elements 16, so that the third arm 8 and the fourth arm 7 move in unison.

[0049] The lever mechanisms 9, which are articulated to the first arm 5 and the second arm 6, tilt the seat support 3 evenly forward on both sides due to the toothed elements 14-17 when the seat support 3 is moved from the lowered position to the raised position.

[0050] A particularly advantageous feature of the seating furniture chassis 1 shown in the figures is the arrangement of the threaded spindle 13 in the housing 4 in the lowered position of the seat support 3. This allows for a particularly space-saving design of the lifting mechanism.

[0051] Another major advantage is the toothed elements 14-17, which connect the arms 5-8 m to each other. They ensure synchronous movement of the first arm 5 m with the second arm 6 and of the third arm 8 m with the fourth arm 7, so that the lever mechanisms 9 tilt the seat support 3 evenly on both sides.

[0052] The embodiment of the seating furniture chassis 18 shown in Figures 11 to 15 functions in principle similarly to the seating furniture chassis 1. It differs from the seating furniture chassis 1, in particular, by a first and a second connecting element 19. In the lowered state of the seat support 3 (see Fig. 11), the first and second connecting elements 19 are positively connected to each other. The second connecting element 19 is arranged inside the first connecting element and is therefore not visible in Fig. 11. When the seat support 3 is raised, the first connecting element is raised relative to the second connecting element 19. The second connecting element 19 is arranged around the threaded spindle 13. The threaded spindle 13 thus passes through a center point of the second connecting element 19. The second connecting element 19 is conical and tapers upwards.

[0053] The first connecting element and the second connecting element 19 are particularly advantageous in the lowered position of the seat support 3, as they allow forces acting on the seat support 3 to be dissipated via the threaded spindle. This increases the stability of the seat chassis 18. In particular, the arms 5, 6, 7 and 8 and the toothed elements are relieved of stress, since they would otherwise dissipate the forces without the connecting elements.

[0054] Furthermore, the seat chassis includes a safety guard 20 that covers a gap created when the seat support 3 is moved from the lowered position to the raised position. This is advantageous in reducing the risk of injury if a body part, for example a finger, is inserted into this gap.

[0055] While Figures 11 to 14 do not show a cover element for the sake of clarity, Figure 16 shows the cover element 21, which covers the area between arms 5, 6, 7, and 8. This is advantageous for both safety and aesthetic reasons. The cover element 21 makes it difficult or impossible to insert a body part, such as a finger, into this area between arms 5, 6, 7, and 8.

[0056] The seat chassis 18 also includes a downward-projecting projection 22 and a bracket with several recesses arranged on a circular line, which is not shown in the figures. When the seat bracket 3 is lowered, the projection 22 is positioned in one of the recesses, thus preventing rotation of the seat bracket about a vertical axis. When the seat bracket 3 is raised, the projection 22 is also raised, so that it is led out of the recess and the seat bracket 3 can rotate about the vertical axis.

Claims

Claims:

1. Seat furniture chassis (1; 18), comprising a seat support (3), a lifting mechanism and a stand element (2), wherein the seat support (3) is connected to the stand element (2) via the lifting mechanism, wherein the stand element (2) is configured to stand on a flat surface, wherein the lifting mechanism is configured to move the seat support (3) from a lowered position to a raised position and vice versa, wherein the lifting mechanism is configured to tilt the seat support (3) during this movement, wherein the lifting mechanism comprises a parallelogram mechanism, wherein the parallelogram mechanism comprises a first arm (5) and a second arm (6), wherein the arms (5;6) are designed to be pivoted relative to each other during the transfer, wherein the first arm (5) has first tooth elements ( 14), wherein the second arm (6) has second tooth elements ( 15), wherein the first tooth elements (14) and the second tooth elements (15) interlock.; 2. Seat furniture chassis (1 ; 18) according to claim 1 , characterized in that the parallelogram mechanism comprises a third arm (8) and a fourth arm (7) which are designed to be pivoted relative to each other during the transition, wherein the third arm (8) has third tooth elements (17), wherein the fourth arm (7) has fourth tooth elements (16), wherein the third tooth elements (17) and the fourth tooth elements (16) interlock.

3. Seat furniture chassis (1 ; 18) according to the previous claim, characterized in that the third arm (8) is pivotably connected to the first arm (5) via a first joint connection ( 12) is connected and that the fourth arm (7) is pivotably connected to the second arm (6) via a second joint connection (1 1 ).

4. Seat furniture chassis (1 ; 18) according to one of the two preceding claims, characterized in that the first arm (5) and the second arm (6) are arranged above the third arm (8) and the fourth arm (7).

5. Seat furniture chassis (1 ; 18) according to one of the three preceding claims, characterized in that the distance between the first tooth elements (14) and the second tooth elements (15) and the third tooth elements (17) and the fourth tooth elements (16) in the raised position of the seat support (3) is greater than in the lowered position of the seat support (3).

6. Seat furniture chassis (1 ; 18) according to one of the four preceding claims, characterized in that the third arm (8) is pivotably connected to a stationary element of the seat furniture chassis (1 ) via a third joint connection.

7. Seat furniture chassis (1 ; 18) according to the previous claim, characterized in that the fourth arm (7) is pivotably connected to the stationary element via a fourth joint connection.

8. Seat furniture chassis (1 ; 18) according to one of the preceding claims, characterized in that the lifting mechanism comprises a threaded spindle (1 3) designed to cause the transfer .

9. Seat furniture chassis (1 ; 18) according to the previous claim, characterized in that the seat furniture chassis (1 ; 1 8) is a Housing (4) comprising which is arranged between the stand element (2) and the parallelogram mechanism, wherein the threaded spindle (1 3) has a lower end, the lower end of which projects into the housing (4) in the lowered position of the seat support (3).

10. Seat furniture chassis (1 ; 18) according to one of the preceding claims, characterized in that the seat furniture chassis (1 ; 1 8) comprises a first connecting element and a second connecting element (19), wherein the first connecting element and the second connecting element (19) are positively connected to each other in the lowered position of the seat support (3), wherein the first connecting element is arranged above the second connecting element (19) in the raised position of the seat support (3). 1 1 . Seat furniture chassis (1 ; 18) according to the previous claim, characterized in that the second connecting element (19) is stationary during rotation of the threaded spindle (13).

12. Seat furniture chassis (1 ; 18) according to one of the two preceding claims, characterized in that the second connecting element (19) is conical and tapers upwards.

13. Seat furniture chassis (1 ; 18) according to one of the preceding claims, characterized in that the seat furniture chassis (1 ; 1 8) has a cover element (21 ) that covers an area between the arms (5; 6; 7; 8).

14. Seat furniture chassis (1; 18) according to one of the preceding claims, characterized in that a lever mechanism (9) is articulated to each of the first arm (5) and the second arm (6), wherein the lever mechanisms (9) are designed to adjust the inclination of the seat support (3) during the movement of the seat surface support (3). to cause seat support (3).

15. Seat furniture chassis (1 ; 18) according to the previous claim, characterized in that the seat furniture chassis (1 ; 1 8) comprises an intervention guard (20), wherein the intervention guard (20) at least partially covers a gap that arises when the seat surface support (3) is moved from the lowered position to the raised position.

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