Seating furniture

Abstract

The invention relates to an item of seating furniture (1) comprising a frame (2) and a double screw assembly (10) arranged on the frame (2), wherein: the double screw assembly (10) supports a seat body (5) providing a seat surface (6) and is designed to move the seat body (5) relative to the frame (2) in the vertical direction; the double screw assembly (10) has a threaded rod (11), a threaded sleeve (12), and a lubricating sleeve (13); the threaded rod (11) has an external thread and the threaded sleeve (12) has an internal and an external thread; the internal thread of the threaded sleeve (12) corresponds to the external thread of the threaded rod (11); the lubricating sleeve (13) has an internal thread which corresponds to the external thread of the threaded sleeve (12).

Description

[0001] seating furniture

[0002] The invention relates to a piece of seating furniture, for example a chair, a stool or the like.

[0003] Seating furniture is known from the prior art and typically comprises a frame and a seat body with a seat surface. To simplify the intended use of a piece of seating, adjustment devices are known from the prior art that allow for height adjustment of the seat body relative to the frame. Such height adjustments are typically implemented using gas springs.

[0004] For example, DE 20 2015 100 185 U1 discloses a piece of seating furniture that comprises a frame, a gas pressure spring, a seat body with a seat surface, and a backrest. The gas pressure spring is arranged on both the frame and the seat body and enables height adjustment of the seat body relative to the frame. Furthermore, the seating furniture provides additional adjustment devices that enable adjustment of the backrest. The disclosed design allows a user to adjust the seating furniture to an individual seating position, thereby achieving improved seating comfort.

[0005] The seating described above has proven itself in everyday practical use, as the use of well-known gas springs, in particular, allows for comfortable and continuous adjustment of the seat. Furthermore, such seating offers the possibility of adopting a further customized seating position by adjusting the backrest.

[0006] Nevertheless, there is still room for improvement, particularly with regard to an expanded range of applications and an improved seating position for the user, particularly an improved sitting posture. Therefore, the object of the invention is to further develop a piece of seating furniture in such a way that improved adjustment of the seat body is enabled.

[0007] To solve this problem, the invention proposes a piece of seating furniture according to claim 1.

[0008] The seating furniture according to the invention has a frame and a double-screw arrangement arranged on the frame. The double-screw arrangement supports a seat body and is designed to move the seat body relative to the frame. The double-screw arrangement comprises a threaded rod, a threaded sleeve, and a lubricating sleeve. The threaded rod has an external thread. The threaded sleeve has an internal and an external thread. The internal thread of the threaded sleeve is designed to correspond to the external thread of the threaded rod. The lubricating sleeve has an internal thread. The internal thread of the lubricating sleeve is designed to correspond to the external thread of the threaded sleeve.

[0009] According to the invention, the double-screw arrangement is designed in two stages. A first stage of the double-screw arrangement is formed by the threaded rod. A second stage of the double-screw arrangement is formed by the threaded sleeve. Alternatively, the double-screw arrangement can have further stages, for example, by one or more additional threaded rods and / or one or more additional threaded sleeves.

[0010] The external thread of the threaded rod is designed to correspond to the internal thread of the threaded sleeve, whereby the threaded rod can be screwed into or out of the threaded sleeve by a rotational movement around its longitudinal axis.

[0011] The external thread of the threaded sleeve is designed to correspond to the internal thread of the lubricating sleeve, whereby the threaded sleeve can be screwed into or out of the lubricating sleeve by a rotational movement around its longitudinal axis.

[0012] The lubricating sleeve also enables lubrication of the external thread of the threaded sleeve, thereby ensuring both smooth operation and reduced wear on both the external thread of the threaded sleeve and the internal thread of the lubricating sleeve itself. By screwing the threaded rod and / or the threaded sleeve in or out, the seat body is moved vertically relative to the frame. The two-stage design of the double screw arrangement advantageously enables a seat surface of the seat body to be moved vertically to a comparatively high position of preferably up to 90 cm, even more preferably up to 100 cm, and most preferably up to 110 cm in relation to the ground.

[0013] Such a high position of the seat enables a user sitting on the chair to move their lower extremities, in particular their feet and lower legs, without them coming into contact with the surface, thereby improving mobility of the lower extremities. In addition, such a high position of the seat enables a user standing at a desk, for example, to lean against the seat, thereby enabling the user to use the seat for support. Furthermore, such a high position of the seat enables users of comparatively short stature, such as children, to better overcome height differences, for example to a table.

[0014] In addition, the two-stage design of the double screw arrangement enables the seat surface of the seat body to be moved to a comparatively low position of preferably 30 cm or less in relation to the ground in the vertical direction.

[0015] Such a low position of the seat makes it easier for children in particular to sit down on the seat. Furthermore, such a low position of the seat makes it easier to incorporate the seating into posture-promoting sitting exercises. For example, a user can easily assume a lotus position, a cross-legged position and / or a heel seat on the seat. A user can therefore adopt a variety of different sitting positions and / or perform a variety of different sitting exercises. Such variable adjustment of the seat in height in relation to the frame also has the advantage that the seating is suitable as a chair for users of a comparatively tall body as well as for users of a comparatively short body size.

[0016] Although the seat surface of the seat body can be moved to a comparatively high or low position, the double screw arrangement is compact and therefore space-saving. The advantage of such a compact design is achieved by the two-stage design described, as the threaded rod can, on the one hand, be telescopically screwed out of the threaded sleeve, thus enabling a high position of the seat surface, and on the other hand, it can be telescopically screwed into the threaded sleeve, whereby the threaded rod does not get in the way of a low position of the seat surface. In addition, the threaded sleeve can, on the one hand, be telescopically screwed out of the lubrication sleeve, thus enabling a high position of the seat surface, and on the other hand, the threaded sleeve can be telescopically screwed into the lubrication sleeve, whereby the threaded sleeve does not get in the way of a low position of the seat surface.

[0017] In contrast to prior art gas springs, the twin-screw arrangement is also characterized by its robust design. This is due in particular to the threads of the threaded rod, the threaded sleeve, and the lubricating sleeve, which can be matched to each other with comparatively close tolerances. The twin-screw arrangement is also designed to be wear-resistant thanks to the described coordination, thus enabling a long service life. A gas spring, on the other hand, becomes unstable, especially as it is increasingly extended. Furthermore, the fluid in the gas spring decreases with increasing service life, so that the gas spring typically has increasingly limited functionality.Furthermore, a gas pressure spring cannot overcome a height difference in order to move a seat to a comparatively low position of, for example, 35 cm in height in relation to the ground and then to a comparatively high position of, for example, 80 cm in height in relation to the ground, since the gas pressure spring itself would stand in the way of such a low position.

[0018] According to a further feature of the invention, the threaded sleeve has a rotation stop. The rotation stop interacts with a stop surface of the lubricating sleeve. The rotation stop is arranged on the outside of the threaded sleeve. The rotation stop, which corresponds to the stop surface, defines a lowest position to which the threaded sleeve can be screwed into the lubricating sleeve. This design allows the lowest position of the threaded sleeve to be repeatedly adjusted.

[0019] The anti-rotation stop can also have a stop located inside the threaded sleeve. The stop located inside corresponds to a stop surface of the threaded rod. The stop, which corresponds to the stop surface, defines an uppermost position to which the threaded rod can be unscrewed from the threaded sleeve. This design allows the uppermost position of the threaded rod to be repeatedly adjusted. Furthermore, this prevents the threaded rod from being inadvertently unscrewed completely from the top of the threaded sleeve.

[0020] According to a further feature of the invention, the lubricating sleeve comprises a copper-zinc alloy. Such an alloy offers the particular advantage of self-lubricating material properties. Such self-lubricating material properties eliminate the need for additional lubrication, for example, by means of lubricating oil. Such self-lubricating material properties prevent insufficient lubrication, since there is no need to supply the lubricating sleeve with an additional lubricant, such as lubricating oil. The lubricating sleeve thus enables lubrication of the external thread of the threaded sleeve, which enables both smooth operation and reduced wear on the external thread of the threaded sleeve and the internal thread of the lubricating sleeve itself.

[0021] The self-lubricating material properties of the lubricating sleeve make the use of additional lubricants obsolete. This also has the advantage that any contaminants that may be stirred up, such as dust or hair, do not adhere to the lubricants and thus to the threads, which would otherwise contaminate them. Such contamination would make the threads stiff over time, and the user would have to laboriously remove the dirt and lubricants and then apply new lubricant. According to a further feature of the invention, the lubricating sleeve is open on the side facing away from the threaded sleeve. This type of design of the lubricating sleeve makes it possible to screw the threaded sleeve into the lubricating sleeve until the rotation stop of the threaded sleeve interacts with the stop surface of the lubricating sleeve, allowing the lowest position of the threaded sleeve to be adjusted.

[0022] In addition, the side of the lubrication sleeve facing away from the threaded sleeve is closed by a tubular body. The tubular body covers the threaded sleeve and / or the threaded rod, thus preventing any risk of injury, for example, from pinching. Furthermore, the tubular body protects the threaded sleeve and / or the threaded rod from external influences, preventing foreign matter from contaminating the external and / or internal thread of the threaded sleeve and / or the external thread of the threaded rod.

[0023] Due to the arrangement of the tube body on the side of the lubricating sleeve facing away from the threaded sleeve and the lack of need for any lubricant due to the self-lubricating material properties of the lubricating sleeve, the double screw arrangement is particularly less susceptible to contamination and therefore particularly low-maintenance.

[0024] According to a further feature of the invention, the tubular body has an internal thread that corresponds to the external thread of the threaded sleeve. The internal thread of the tubular body offers the particular advantage of an enlarged receptacle for the external thread of the threaded sleeve. In addition to the internal thread of the lubricating sleeve, forces introduced via the external thread of the threaded sleeve, in particular weight forces, can thus be better absorbed. Such a design reduces wear on the external thread of the threaded sleeve and the internal thread of the lubricating sleeve.

[0025] According to a further feature of the invention, the seat is rectangular and has an edge length of preferably 50 to 70 cm, more preferably 40 to 80 cm, and particularly preferably 30 to 90 cm. A seat dimensioned in this way provides, in particular, sufficient seating space, thereby making it easier for a user to adopt an improved sitting position, in particular an individual sitting position. Furthermore, a seat designed in this way enables the user to easily perform posture-promoting sitting exercises; for example, a user can thus easily perform a lotus position, a cross-legged position, and / or a heel seat.

[0026] The seat body can alternatively provide an oval seat surface to allow the user an improved ergonomic sitting position. As a further alternative, the seat body can provide a polygonal seat surface. The seat body can also provide a flat seat surface. The seat surface is also provided with seat padding, which in particular provides improved seating comfort.

[0027] According to a further feature of the invention, a tilting device is arranged between the double-screw arrangement and the seat body, wherein the tilting device enables the seat surface to be tilted relative to the frame. Such a tilting device enables individual adjustment of the seat body, so that a user standing at a desk, for example, can use the seat surface for support.

[0028] According to a further feature of the invention, it is provided that the inclination device enables an inclination of the seat surface of preferably up to 30 degrees, more preferably up to 40 degrees and particularly preferably up to 50 degrees, thereby enabling a further improved use of the seating furniture.

[0029] According to a further feature of the invention, the seat body has a legrest arranged on the underside of the seat body and designed to be movable relative to the seat body. The movable legrest allows for a further improvement of the user's seating position. The legrest is individually adjustable, thereby providing improved support for the user's lower extremities, particularly the lower legs.

[0030] According to a further feature of the invention, a flexible backrest and a support element are arranged on the seat body, which can be moved vertically relative to the seat body. The backrest can be fixed to the seat body with connecting elements, for example clamping screws, so that the user can assemble or disassemble the backrest on the seating furniture with little effort. The backrest is designed to be flexible, thereby providing increased seating comfort. The backrest can also be curved. Such a design further improves seating comfort, particularly in the back area. The support element can be moved vertically relative to the seat body, so that the user can adjust an appropriately individual seating position.

[0031] According to a further feature of the invention, the frame has a U-shaped base, wherein a support part with an arcuate cross-section is arranged on the U-shaped base, which support part carries the double screw arrangement. On the one hand, the U-shaped base allows for a material-saving design compared to, for example, a square design. On the other hand, the base provides a support surface so large that tipping of the seating is prevented. The frame comprises a steel alloy. The support part is arcuate in order to be able to better absorb, and in particular cushion, forces introduced by the double screw arrangement, in particular weight forces.

[0032] The U-shaped base part is symmetrical along its longitudinal axis. A first end of the support part is arranged along the longitudinal axis of the base part, in an outer edge region on a surface of the base part facing away from the ground. The base part is integrally connected to the first end of the support part, preferably by welding. The support part extends in an arc along the longitudinal axis of the base part to the middle of a length of the base part extending along the longitudinal axis of the base part, where a second end of the support part carries the double screw arrangement.

[0033] For the purposes of the invention, "arched in cross-section" means that the support part is arched from its first end, which is arranged on the support part, to its second end, which carries the double screw arrangement. "Arched" for the purposes of the invention means that the support part is partially parabolic, most preferably partially circular.

[0034] The length of the foot part extending along the longitudinal axis of the foot part is preferably 60 cm. Both the foot part and the support part have a material thickness of preferably 2 cm. The surface facing away from the ground has a width of preferably 12.5 cm along the longitudinal axis of the foot part. The width of the surface tapers towards both a first and a second end of the foot part to preferably 4 cm.

[0035] The geometric design of the footrest and / or the support section makes the frame particularly stable. This effectively prevents the chair from tipping over, even when the seat is in its highest position.

[0036] According to a further feature of the invention, the rectangular seat surface is not square. The rectangular seat surface has two opposing first edges and two opposing second edges. The first edges are always longer than the second edges. For example, the first edges can be 65 cm long and the second edges 50 cm long. Of course, the edge length of the first edges and the second edges can be freely selected within the range of 50 to 70 cm, 40 to 80 cm, or 30 to 90 cm, as long as the first edges are longer than the second edges.

[0037] This design offers the advantage that the user can individually decide how they wish to position themselves on the seat. For example, the user can sit in a first sitting position with their back to one of the first two edges of the seat. In this first sitting position, it is advantageous for the user to assume a cross-legged or lotus position, as the user's legs can be placed along the first edges of the seat in this sitting position.

[0038] Alternatively, the user can also assume a second sitting position, placing their back to one of the second edges of the seat. In this second sitting position, the user can stretch their legs straight out from their stomach along the first edges of the seat. In this second sitting position, it is also advantageous for the user to assume the heel position, as this allows them to stretch their lower legs parallel to the first edges.

[0039] According to a further feature of the invention, at least one insert is arranged on an underside of the seat body facing away from the seat surface, i.e., on the underside of the seat body. Up to three inserts can be arranged on the underside of the seat body. If an insert is provided, it is arranged on the underside of the seat body in the region of any edge of the seat surface. If the seat surface is rectangular, the insert is arranged centrally on the underside of the seat body in the region of one of the edges.

[0040] The backrest or armrest can advantageously be mounted on the insert. To do this, the backrest or armrest is inserted into the insert using a designated section and secured with a fastener, such as a clamping screw, without tools.

[0041] If multiple inserts are provided, these are always located on the underside of the seat body. If three inserts are provided, the seat body, if rectangular but not square, has one of the inserts centrally located in the area of ​​one of the two first edges on the underside of the seat body. The third insert is located centrally on the underside of the seat body in the area of ​​one of the two second edges.

[0042] If three slots are provided, the backrest and / or the armrest and / or another armrest can be arranged on each of the three slots.

[0043] The backrest and armrests are attached to the inserts as described above. This advantageously allows the chair to be adapted to the individual needs of the user.

[0044] For example, if the two armrests are positioned on the slots near the first two edges, and the backrest is positioned on the slot near one of the second two edges, the user can rest their arms on the armrests and simultaneously lean their back against the backrest and any support element attached to it. This arrangement allows the user to stretch their legs along the first edges. Such a sitting position is referred to as a comfortable or relaxed position within the context of the invention.

[0045] A lower edge of the support element in the vertical direction preferably has a length of 50 cm, which corresponds to the preferred length of the second edges of the seat. This allows the user to lean against the support element along the entire length of the second edge, which is the backrest, in the comfortable or relaxed position.

[0046] When the seat body and thus the seat surface are extended to their highest position, the option of positioning the backrest either at one of the second or one of the first edges creates the synergistic effect of additionally stabilizing the seating furniture by positioning the backrest at one of the slots on one of the first two edges. Tipping over of the seating furniture, for example, due to the user leaning forcefully against the backrest, is effectively prevented by shortening the lever arm provided by the seat surface.

[0047] A backrest cushion is preferably permanently attached to the backrest. The backrest cushion is positioned vertically above the support element on the backrest. The backrest cushion advantageously increases seating comfort, as it allows the user to rest their head or upper back against the cushion, depending on their height.

[0048] According to a further feature of the invention, the seat body provides a drawer which is arranged on the underside of the seat body and is designed to accommodate the leg rest. The drawer is preferably arranged in the region of one of the two second edges. If one or more inserts are provided, the drawer is in any case arranged in the region of the edge on the underside of the seat body which does not support an insert. If the drawer is arranged in the region of one of the second edges, the drawer extends from one of the two first edges to the other first edge of the seat surface, whereby the drawer does not reach quite to the first edges. The geometric dimensions of the drawer are designed such that the drawer can accommodate the leg rest entirely.When pushed in, with the leg rest pushed into the drawer, the leg rest does not protrude from the drawer. If the leg rest is pulled out of the drawer in a translational movement orthogonal to the height direction, the drawer can protrude up to 24 cm from the drawer in this extended state. The extended leg rest makes it advantageous to extend the seat to include an area for the leg rest. It is also advantageous that the leg rest can be stowed away on the seating furniture itself when not in use by pushing the leg rest into the drawer. There is therefore no need to store the leg rest somewhere else. The leg rest therefore does not take up any additional space when not in use. It is also advantageous for the user to be able to pull the leg rest out of the drawer when required.The use of tools is neither necessary to push the leg rest into nor to pull it out of the drawer, so that both processes can be carried out by the user without great effort and without having to have tools on hand.

[0049] To further simplify the process of pulling the leg rest out of and into the drawer, a gripping element can be arranged on an edge of the leg rest that the user must grasp to pull the leg rest out of the drawer. The gripping element can be designed in any desired manner. A design as an eyelet is preferred. An eyelet made of a metallic material is particularly preferred.

[0050] According to a further feature of the invention, the support element has at least one eyelet. Two eyelets can also be provided. The eyelet or eyelets are preferably made of a metallic material. The eyelet or eyelets are arranged on a rear side of the support element facing away from the seat surface, wherein the eyelet or eyelets protrude beyond the lower edge of the support element in the vertical direction. If two eyelets are provided, they are arranged at the same distance from the connecting element with which the support element can be attached to the backrest. A safety device, e.g. a safety belt, can be arranged on the eyelet or eyelets. This safety belt can be used, for example, to secure children from falling from the seating furniture according to the invention.At the same time, due to the flexible properties of the safety belt compared to conventional child seats, it is possible for a child secured with the safety belt on the seating furniture according to the invention to have significantly greater freedom of movement than in conventional child seats, in which the child's legs are often fixed in recesses designed for this purpose.

[0051] According to a further feature of the invention, a backrest is arranged on the seat body, wherein the backrest is designed in three parts and has the backrest, a backrest cushion and the support element, wherein the backrest cushion is arranged at an upper end of the backrest in the vertical direction, wherein the support element is arranged on the backrest below the backrest cushion in the vertical direction, and wherein the support element has a basic shape in the manner of a triangle. The backrest is arranged on the seat body. The backrest is designed in three parts and has the backrest, the backrest cushion and the support element. The backrest cushion is arranged at an upper end of the backrest in the vertical direction. The support element is arranged on the backrest below the backrest cushion in the vertical direction. The support element is movable in the vertical direction along the backrest and can be arranged at any height by the user.The basic shape of the support element is triangular, providing optimal support for the user's back. If desired, the support element can also be removed from the backrest by the user.

[0052] The design of the backrest allows the user to adjust the backrest to their individual needs.

[0053] According to a further embodiment of the invention, the tubular body is materially connected to the support part. A connection by welding is preferred. The lubricating sleeve is arranged vertically above the tubular body. The tubular body has the internal thread which is designed to correspond to the external thread of the threaded sleeve. As a result of this configuration, forces transmitted from the seat body to the threaded rod to the threaded sleeve are advantageously absorbed by the internal thread of the tubular body and slide into the support part. Both the internal thread of the lubricating sleeve and the external thread of the threaded sleeve are protected from wear. At the same time, the tubular body protects the external thread of the threaded sleeve and / or the thread of the threaded rod from contamination.This design therefore has the synergistic effect that the pipe body ensures a particularly long service life of the threads in question by protecting them from wear and contamination.

[0054] According to a further embodiment of the invention, the lubricating sleeve has a base body with a circular cross-section and an extension with a circular cross-section arranged thereon, wherein the extension carries an external thread and has a smaller diameter than the base body, wherein the support part provides a through-bore that is designed to correspond to the extension of the lubricating sleeve. The lubricating sleeve has the base body with a circular cross-section. The base body has the extension with a circular cross-section. The extension carries the external thread. The extension has a smaller diameter than the base body. The support part provides the through-bore. The through-bore is designed to correspond to the extension of the lubricating sleeve.

[0055] Designed to correspond to the extension of the lubricating sleeve in the sense of the invention means that the through-hole is designed in such a way that the extension of the lubricating sleeve can pass through this through-hole.

[0056] According to a further feature, the invention is characterized by a counter unit configured to correspond to the external thread provided by the extension of the lubricating sleeve, wherein the counter unit is screwed to the lubricating sleeve in the final assembled state with the support part interposed, wherein the counter unit is preferably provided by the tubular body. The counter unit is configured to correspond to the external thread of the lubricating sleeve. In the final assembled state, the counter unit is screwed to the external thread of the lubricating sleeve with the support part interposed. The counter unit is preferably provided by the tubular body.

[0057] This embodiment of the invention offers the advantage that the tubular body serves as a counter unit for arranging the double screw assembly on the support part, thus connecting the double screw assembly to the support part. A further advantage is the previously described protection of the threaded sleeve and / or threaded rod from external influences such as contamination.

[0058] In order to move the seat body and thus the seat surface of the seating furniture according to the invention from the uppermost to the lowest position, it is necessary to rotate the seat body of the seating furniture in one direction so that the threaded rod and the threaded sleeve rotate about their longitudinal axes. Due to the self-lubricating effect of the copper-zinc alloy of the lubricating sleeve, both the static and sliding friction coefficients between the lubricating sleeve and the threaded sleeve are lower than the static and sliding friction coefficients between the threaded rod and the threaded sleeve. Due to the rotational movement of the seat body, the threaded sleeve is first screwed so deeply into the lubricating sleeve until the rotation stop of the threaded sleeve rests on the stop surface of the lubricating sleeve due to the lower friction force between the threaded sleeve and the lubricating sleeve, caused by the self-lubricating effect of the copper-zinc alloy of the lubricating sleeve.Only then is the threaded rod screwed into the threaded sleeve by further rotating the seat body in the same direction until the seat body rests against the anti-rotation stop of the threaded sleeve with its underside facing away from the seat surface. The threaded rod is thus screwed telescopically into the threaded sleeve, and the threaded sleeve is screwed telescopically into the lubrication sleeve until the lowest position is reached.

[0059] To move the seat body, and thus the seat surface, from the lowest position back to the highest position, it is necessary to rotate the seat body of the seating furniture in the opposite direction. In the same way as screwing in, the threaded sleeve is first unscrewed from the lubrication sleeve, and then the threaded rod is unscrewed from the threaded sleeve. The anti-rotation stop located inside the threaded sleeve prevents the threaded rod from being completely unscrewed from the threaded sleeve.

[0060] A flat seat surface within the meaning of the invention means that the seat surface does not have any depressions or elevations.

[0061] Further features and advantages of the invention will become apparent from the following description with reference to the figures. Figure 1 shows a schematic perspective view of a piece of seating furniture according to the invention with an extended double screw arrangement;

[0062] Fig. 2 is a schematic perspective view of the seating furniture according to the invention with armrests;

[0063] Fig. 3 is a schematic perspective view of the seating furniture according to the invention with retracted double screw arrangement and with an extended leg rest.

[0064] Figure 1 shows a schematic perspective view of a piece of seating furniture 1 according to the invention with a seat body 5 and a leg rest 18.

[0065] The seating furniture 1 according to the invention has a frame 2, a double screw arrangement 10 and a seat body 5. The frame 2 comprises a foot part 3, which is U-shaped, and a support part 4 arranged on the foot part 3, which has an arcuate cross-section. The foot part 3 can be equipped with felt on the underside. This configuration allows the seating furniture 1 to be positioned gently relative to the ground. Alternatively, five casters can be arranged on the underside of the foot part 3. The casters preferably have two wheel discs and can thus be referred to as double casters. The casters enable, in particular, simplified positioning of the seating furniture 1, since this configuration allows a user to move the seating furniture 1 more easily relative to the ground. The support part 4 carries the double screw arrangement 10. A tubular body 16 is arranged underneath the double screw arrangement 10.The double screw arrangement 10 also supports the seat body 5. The double screw arrangement 10 is configured to move the seat body 5 relative to the frame 2. The seat body 5 provides a seat surface 6.

[0066] In addition, at least one insert is arranged on the seat body 5. The insert enables the arrangement of a backrest 19 on the seat body 5. Alternatively, the insert enables the arrangement of an armrest 24 on the seat body 5, as shown in Figure 2. The user can thus individually position the backrest 19 and / or the armrest 24 on the seat body 5 and thus individually adjust the seating furniture 1. The user can arrange the backrest 19 and / or the armrest 24 on the seat body 5 with both the left and right hand, thereby allowing the user to easily adjust the seating furniture 1. Armrests 24 also serve the purpose of allowing the user to assume a comfortable position during a break. Armrests 24 are generally undesirable, since the aim of the seating furniture 1 according to the invention is precisely to adopt a medically correct sitting posture.Nevertheless, it is desirable to be able to assume a relaxing posture, especially during breaks. For this purpose, armrests 24 are provided, which can be removably mounted. The backrest 19 has a backrest cushion 20. Furthermore, the backrest 19 has a support body 21, which is designed to be movable relative to the seat body 5 in the vertical direction 23. The leg rest 18 is also arranged on the seat body 5. The leg rest 18 is designed to be movable relative to the seat body 5.

[0067] The seating furniture 1 has a backrest 28 which is designed in three parts and has the backrest 19, the backrest cushion 20 and the support element 21.

[0068] The double screw arrangement 10 is arranged on the support part 4. The double screw arrangement 10 comprises a threaded rod 11, a threaded sleeve 12 and a lubricating sleeve 13. A tubular body 16 is arranged on the underside of the double screw arrangement 10 and serves to receive the threaded rod 11 and the threaded sleeve 12. An inclination device is arranged on the threaded rod 11 and is designed to incline the seat surface 6 of the seat body 5 relative to the frame 2. The seat upholstery 7 is arranged on the seat body 5. In addition, a leg rest 18 is arranged on the underside of the seat body 5. The leg rest 18 is designed to be translationally movable relative to the seat body 5 orthogonally to the height direction 23. Furthermore, the seat body 5 provides the at least one insert. The insert makes it possible to arrange the backrest 19 or the armrest 24 on the seat body 5.The backrest 19 or the armrest 24 is arranged by inserting a section of the backrest 19 or a section of the armrest 24 into the insert, wherein the section of the backrest 19 or the armrest 24 inserted into the insert 9 can be fixed without tools by a fastening means, for example a clamping screw.

[0069] The backrest 19 also has the support element 21, which is designed to be movable relative to the backrest 19. The support element 21 provides an eyelet 22. The eyelet 22 enables the attachment of a safety device, for example a safety belt, to secure a user sitting on the seating 1, for example a child, against falling or tipping sideways. The safety device can also be designed such that a child sitting on the seating 1 cannot stand up once it is secured by the safety device. This further secures the child sitting on the seating 1. Furthermore, a child sitting on the seating 1 is supported by the backrest 28 and thus additionally secured against falling or tipping.A child sitting on the seating furniture 1, which is secured in particular by the safety device, can thus advantageously perform movements, in particular leg movements, without falling off the seating furniture 1. The seating furniture 1 is thus suitable not only for users who wish to perform posture-promoting sitting exercises, for example, a lotus position, a cross-legged position, and / or a heel seat, but also for children who are to be placed at a table, for example, whereby the seating furniture 1 can also be described as multi-purpose furniture.

[0070] The office furniture 1 can be seen in Figure 1 with the double screw assembly 10 extended. Extended within the meaning of the invention means that the threaded rod 11 is unscrewed from the threaded sleeve 12 and / or the threaded sleeve 12 is unscrewed from the lubrication sleeve 13.

[0071] When the double screw arrangement 10 is extended, the seat body 5 arranged on the threaded rod 11 is thus moved in the vertical direction 23 around the unscrewed threaded rod 11 and / or threaded sleeve 12, whereby a raised position of the seat body 5 relative to the frame 2 is achieved. In addition to the threaded rod 11 and the threaded sleeve 12, the double screw arrangement 10 has the lubricating sleeve 13. The lubricating sleeve 13 enables lubrication of the external thread of the threaded sleeve 12. The lubricating sleeve 13 is open on the underside of the threaded sleeve. A tubular body 16 is arranged on the underside of the lubricating sleeve. The tubular body 16 closes the side of the lubricating sleeve 13 facing away from the threaded sleeve, thereby protecting the threaded sleeve 13 and / or the threaded rod 11 from external influences.

[0072] The double screw arrangement 10 is arranged on the support part 4. The support part 4 has an arcuate cross-section, which allows for improved absorption, particularly cushioning, of introduced forces, in particular weight forces. The support part 4 is arranged on the base part 3 of the frame 2. The base part 3 is U-shaped and enables the seating furniture 1 according to the invention to be positioned in a manner that prevents it from tipping over relative to the ground.

[0073] The seat body 5, which has the seat upholstery 7, is arranged on the threaded rod 11. The seat upholstery provides a seat surface 6. The seat body 5 also provides a drawer 8. The drawer 8 is arranged underneath the seat body 5. The drawer 8 is designed to accommodate the leg rest 18. The leg rest 18 is designed to be movable relative to the seat body 5. Furthermore, the backrest 19 is arranged on the seat body 5. The backrest 19 provides the backrest cushion 20 and the support element 21. The support element 21 is designed to be movable relative to the backrest 19. An eyelet is also arranged on the support element 21.

[0074] Figure 3 shows the seating furniture 1 according to the invention with the double screw arrangement 10 retracted. Retracted within the meaning of the invention means that the threaded rod 11 is completely screwed into the threaded sleeve 12 and the threaded sleeve 12 is also completely screwed into the lubricating sleeve 13. With the double screw arrangement 10 retracted, the seat body 5 arranged on the threaded rod 11 is thus moved into a low position of the seat body 5 relative to the frame 2, in particular into a position of the seat body 5 close to the floor.

[0075] Figure 1 also shows the frame 2 according to the invention with the double screw arrangement 10. The threaded sleeve 12 has a rotation stop 15. The lubricating sleeve 13 has a stop surface 14. The rotation stop 15 interacts correspondingly with the stop surface 14 as soon as the threaded sleeve 12 is completely screwed into the lubricating sleeve 13. This allows a lowest position of the threaded sleeve 12 to be repeatedly adjusted. A tubular body 16 is arranged on the underside of the lubricating sleeve. As soon as the threaded sleeve 12 and / or the threaded rod 11 are screwed into the lubricating sleeve 13, the tubular body 16 receives the section of the threaded sleeve 12 and / or the threaded rod 11 that protrudes from the underside of the lubricating sleeve 13. The tubular body 16 thus protects the threaded sleeve 12 and / or the threaded rod 11 from external influences, in particular from contamination.In addition, the tubular body 16 prevents the risk of injury, such as pinching, since a user cannot make direct contact with the sections of the threaded sleeve 12 and / or the threaded rod 11 that protrude from the underside of the lubricating sleeve.

[0076] Figure 1 shows the seating furniture 1 according to the invention in a state in which the double screw arrangement 10 is extended. The seat surface 6 of the seat body 5 is rectangular, but not square. Accordingly, the rectangular seat surface 5 has two opposing first edges 26 and two opposing second edges 27, with the first edges 26 always being longer than the second edges 27.

[0077] The backrest 19 is arranged with the section provided for it in the insert provided for it, which is arranged on the underside of the seat body 5 centrally along one of the first edges 26. With this arrangement of the backrest 19, it is advantageously possible for the user to position themselves in the cross-legged or lotus position on the seat surface 6 and to rest their legs along the first edges 26. At the same time, the user can lean on the backrest 19, the support element 21 attached thereto, and the backrest cushion 20 attached in the vertical direction 23 above the support element 21, thereby supporting the user's back.

[0078] The support element 21 has the eyelet 22 and another eyelet 22. The eyelets 22 are arranged on a rear side of the support element 21 facing away from the seat surface 6, with the eyelets 22 extending beyond the lower edge 23 of the support element 21 in the vertical direction. The child safety device (not shown) can be arranged on the eyelets 22.

[0079] In Figure 2, the seat surface is also rectangular, but not square. At each of the two first edges 26, a slot for an armrest 24 is arranged on the underside of the seat body 5. An armrest 24 is arranged in each slot with the corresponding section.

[0080] The backrest 19 is arranged on one of the second edges 27 with the section provided for it in the provided insert, which is arranged on the underside of the seat body 5 centrally along one of the second edges 27. The support element 21 is arranged on the backrest 19, and the backrest cushion 20 is arranged in the vertical direction 23 above the support element 21. In this embodiment of the seating furniture 1, the backrest 19 is curved.

[0081] Figure 3 shows the seating furniture 1 according to the invention. As in Figure 2, the seat surface 6 is rectangular but not square, so the seat surface 6 has the two first edges 26 and the two second edges 27, whereby here too the first edges 26 are always longer than the second edges 27. The backrest 19 is arranged on one of the second edges 27, as described above for Figure 2. The drawer 8 is arranged on the underside of the seat surface on the seat body 5 on the further second edge 27, on which the backrest 19 is not arranged. The leg rest 18, which is otherwise fully inserted, is pulled out of the drawer 8, so that the seat surface 6 is extended along the first edges 26 by the leg rest 18 for supporting the user's legs or lower legs.

[0082] To further simplify the pulling out and pushing in of the leg rest 18 from and into the drawer 8, a gripping element 25 can be arranged on an edge of the leg rest, which the user must grasp to pull the leg rest 18 out of the drawer 8. The gripping element 25 can be designed in any desired manner. A design as an eyelet is preferred.

[0083] In the context of the invention, an arcuate cross-section means that the support part 4 is arcuate from a first end, which is arranged on the support part 4, to a second end, which carries the double screw arrangement 10. Arcuate in the context of the invention means that the support part 4 is partially parabolic, most preferably partially circular.

[0084] The office furniture 1 within the meaning of the invention is the seating furniture 1.

[0085] The support body 21 in the sense of the invention is the support element 21.

[0086] The armrests 24 in the sense of the invention are the armrests 24. Reference numerals

[0087] 1 seating furniture

[0088] 2 frames

[0089] 3 Footrest

[0090] 4 Support part

[0091] 5 seat body

[0092] 6 Seat

[0093] 7 Seat upholstery

[0094] 8 drawer leg rest

[0095] 10 Double screw arrangement

[0096] 11 Threaded rod

[0097] 12 threaded sleeve

[0098] 13 Lubricating sleeve

[0099] 14 Stop surface

[0100] 15 Twist stop

[0101] 16 pipe bodies

[0102] 18 Leg rest

[0103] 19 backrest

[0104] 20 backrest cushions

[0105] 21 Support element

[0106] 22 eyelet

[0107] 23 Altitude direction

[0108] 24 Armrest

[0109] 25 gripping element

[0110] 26 First edges

[0111] 27 Second edges

[0112] 28 Backrest

Claims

AMENDED CLAIMS received by the International Bureau on 13 August 2025 1. Seating furniture (1) with a frame (2) and a double-screw arrangement (10) arranged on the frame (2), wherein the double-screw arrangement (10) supports a seat body (5) providing a seat surface (6) and is configured to move the seat body (5) in the vertical direction relative to the frame (2), wherein the double-screw arrangement (10) comprises a threaded rod (11), a threaded sleeve (12), and a lubricating sleeve (13), wherein the threaded rod (11) has an external thread and the threaded sleeve (12) has an internal and an external thread, wherein the internal thread of the threaded sleeve (12) is designed to correspond to the external thread of the threaded rod (11), wherein the lubricating sleeve (13) has an internal thread which is designed to correspond to the external thread of the threaded sleeve (12), characterized in that the lubricating sleeve (13) is designed to be open on the side facing away from the threaded sleeve,wherein the side facing away from the threaded sleeve is closed by a tubular body (16), wherein the tubular body (16) has an internal thread which is designed to correspond to the external thread of the threaded sleeve (12).

2. Seating furniture (1) according to claim 1, characterized in that the threaded sleeve (12) has a rotation stop (15) which cooperates correspondingly with a stop surface (14) of the lubricating sleeve (13).

3. Seating furniture (1) according to claim 1 or 2, characterized in that the lubricating sleeve (13) comprises a copper-zinc alloy.

4. Seating furniture (1) according to one of the preceding claims, characterized in that the seat surface (6) is rectangular and has an edge length of preferably 50 to 70 cm, more preferably 40 to 80 cm and particularly preferably 30 to 90 cm.

5. Seating furniture (1) according to one of the preceding claims, characterized in that an inclination device (17) is arranged between the double screw arrangement (10) and the seat body (5), wherein the inclination device (17) enables an inclination of the seat surface (6) relative to the frame.

6. Seating furniture (1) according to claim 5, characterized in that the inclination device AMENDED SHEET (ARTICLE 19) (17) enables an inclination of the seat surface (6) of preferably up to 30 degrees, more preferably up to 40 degrees and particularly preferably up to 50 degrees.

7. Seating furniture (1) according to one of the preceding claims, characterized in that the seat body (5) has a leg rest (18) which is arranged on the underside of the seat body and is designed to be movable relative to the seat body (5).

8. Seating furniture (1) according to one of the preceding claims, characterized in that a flexible backrest (19) is arranged on the seat body (5) and a support element (21) is arranged on the backrest (19), which support element can be moved in the vertical direction relative to the seat body (5).

9. Seating furniture (1) according to one of the preceding claims, characterized in that the frame (2) has a U-shaped foot part (3), wherein a support part (4) which is curved in cross section, preferably partially parabolic, most preferably partially circular, is arranged on the U-shaped foot part (3) and carries the double screw arrangement (10).

10. Seating furniture (1) according to one of claims 8 or 9, characterized in that a backrest (28) is arranged on the seat body (5), wherein the backrest (28) is designed in three parts and has the backrest (19), a backrest cushion (20) and the support element (21), wherein the backrest cushion (20) is arranged at an upper end of the backrest (19) in the vertical direction (23), wherein the support element (21) is arranged on the backrest (19) below the backrest cushion (20) in the vertical direction (23), and wherein the support element (21) has a basic shape in the manner of a triangle.

11. Seating furniture (1) according to one of claims 9 or 10, characterized in that the tubular body (16) is integrally connected to the support part (4).

12. Seating furniture (1) according to one of claims 9 or 10, characterized in that the lubricating sleeve (13) has a base body with a circular cross-section and a cross-sectionally circular extension arranged thereon, wherein the extension carries an external thread and has a smaller diameter compared to the base body, wherein the support part (4) provides a through-bore which is designed to correspond to the extension of the lubricating sleeve (13).

13. Seating furniture (1) according to claim 12, characterized by an external thread corresponding to the extension of the lubricating sleeve (13) AMENDED SHEET (ARTICLE 19) formed counter unit, wherein the counter unit is screwed to the lubricating sleeve (13) in the final assembled state with the support part (4) interposed, wherein the counter unit is preferably provided by the tubular body (16). AMENDED SHEET (ARTICLE 19)

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