WO2019170846A1 - Telescoping leg for a piece of furniture and piece of furniture having a leg of this type - Google Patents

Abstract

The invention relates to a telescoping leg (10), comprising an outer tube (12), which extends along an axis, at least one intermediate tube (14), which is arranged in the outer tube (12), an inner tube (16), which is arranged in the intermediate tube (14), a gas spring (20), which causes a stroke, and a transmission (18). The transmission (18) causes the inner tube (16) to perform a stroke relative to the outer tube (12), which stroke is a multiple of the stroke of the gas spring (20). The invention further relates to a piece of furniture comprising at least one telescoping leg (10) of this type.

Description

 Telescopic leg for a piece of furniture and a piece of furniture

 with such a leg

The invention relates to a telescoping leg for a piece of furniture comprising an outer tube extending along an axis, at least one intermediate tube disposed in the outer tube, an inner tube disposed in the intermediate tube, a gas spring and a transmission. Furthermore, the invention relates to a piece of furniture with such a telescopic leg. Telescopic legs and pieces of furniture with telescopic legs are made of

Practice known and are used for example in height-adjustable tables or height-adjustable chairs. Known telescopic legs have a first pillar profile, a second pillar profile and a third pillar profile, wherein the pillar profiles are movable in the axial direction by means of a drive unit and a gear unit relative to each other.

In previously known telescopic legs and known pieces of furniture with such a leg, however, there is the problem that the gear unit requires a large number of components and a high design effort, which is associated with additional costs, and has a poor efficiency. In addition, due to the large number of components increases the installation effort and the required space. Also, a height adjustment in the axial direction is possible only to a limited extent.

The present invention is therefore based on the object to propose a telescoping leg and a piece of furniture with such a telescopic leg, which has an improved height variability in an axial direction, comprises a gear with lower complexity, which has a larger lift in a small space and where the maximum efficiency can be achieved for a given power requirement.

This object is achieved by the telescopic leg with the features of claim 1 and the piece of furniture having the features of claim 13. The telescopic leg for a piece of furniture according to the invention comprises an outer tube, an intermediate tube, an inner tube, a gas pressure spring and a transmission. The intermediate tube is arranged in the outer tube and the inner tube is located in the intermediate tube. The gas spring serving as a drive causes a stroke, wherein the transmission causes the inner tube relative to the outer tube performs a stroke which is a multiple of the stroke of the gas spring.

Thus, a telescoping leg or a piece of furniture is comprehensively provided such a leg, which has an increased height variability or a larger lift in an axial direction with a smaller space requirement compared to the prior art. In addition, the highest possible efficiency is achieved for a given power requirement. By a simple structural design of the transmission beyond the number of necessary components of the transmission can be reduced, reduced assembly costs and costs are reduced.

The outer tube, the intermediate tube and the inner tube may have a round, an oval, a square cross section or the cross section may have any other shape.

In a preferred embodiment, the stroke of the gas spring acts on the intermediate tube. Thereby, the intermediate tube is displaced in an axial direction relative to the outer tube. This relative movement makes it possible to easily transfer the stroke of the gas spring by means of a gear on the inner tube. In an alternative embodiment, the stroke of the gas pressure spring, for example via a coupling element, is transferred to the intermediate tube. The coupling element may be formed on the intermediate tube and secured in position in the axial direction at an upper part of the gas spring. Alternatively, the coupling element can also be arranged on an upper part of the gas pressure spring and on the intermediate tube be fixed that between the upper part of the gas spring and the intermediate tube no axial play is possible. As a result, a power loss, resulting for example from friction, can be reduced and thus the efficiency of the generated by the drive unit hub can be increased. In an alternative embodiment, the gas spring comprises a locking device which secures the telescoping leg at a desired height or position against unwanted height adjustment. The integration of the locking device in the gas spring eliminates additional components, resulting in a low space requirement and a cost reduction. In order to increase the efficiency of the transmission while reducing the required installation space, the transmission may comprise a belt or a belt band and at least two pulleys, wherein the belt is for example a flat band, a V-belt or a toothed belt.

In a preferred embodiment, the belt is fixed to the outer tube and to the inner tube, in particular a lower region of an outer side of the inner tube and an upper region of an inner side of the outer tube. The fixation is done for example by means of a clip connection, a screw connection, a Klebver bond or a riveted joint. The two pulleys are mounted in the axial direction at an upper and a lower portion or an upper and a lower end of the intermediate tube. By such an arrangement of the belt and the pulleys, the height variability of the telescopic leg is increased in the axial direction and reduces the design effort.

In an alternative embodiment, the transmission has a gear and at least two racks, the racks respectively being engaged with the gear. Due to the positive and slip-free power transmission, a high degree of utilization of the stroke caused by the gas spring can be achieved. In addition, such a transmission allows a transmission of relatively high forces counterclockwise and clockwise. The first rack is fixed, for example, on an inner side of the outer tube, and the second rack is, for example, arranged on an outer side of the inner tube. The bearing of the gear can be made on the intermediate tube, wherein the gear with the two racks is engaged and transmits the caused by the gas spring stroke of the intermediate tube by means of the racks and the gear on the inner tube. Such an arrangement of the racks and the gear wheel makes it possible to design the gearbox with a small space requirement.

In an alternative embodiment, the telescoping leg comprises at least a second intermediate tube, wherein the second intermediate tube is arranged in the first intermediate tube. The second intermediate tube experiences by means of the transmission relative to the outer tube a stroke which is a multiple of the stroke of the gas spring. The second intermediate tube thus makes it possible to further increase the height variability of the telescoping leg.

The transmission may comprise a third and a fourth deflection roller, wherein the third and the fourth deflection roller are each rotatably mounted on the second intermediate tube. In addition, the transmission may have a second belt. The belt may be fixed to the first intermediate pipe and the inner pipe, in particular, to an inner side of an upper portion of the first intermediate pipe and to an outer side of a lower portion of the inner pipe. Fixing takes place, for example, by means of a clip connection, a screw connection, an adhesive connection or a riveted connection. The two pulleys may be rotatably mounted on the second intermediate tube, in particular at axial end portions or at axial ends of the second intermediate tube. As a result, the height variability can be improved in the axial direction and the design effort can be reduced. In an alternative embodiment, the transmission comprises a second gear and a third and a fourth rack. The second gear is mounted in the second intermediate tube. The racks are arranged such that the first rack on an inner side of the outer tube, the second Zanhstange on an outer side of the second intermediate tube, the third rack on the inside of the first intermediate tube and the fourth rack are arranged on the outside of the inner tube. The first gear engages the first and second racks. The second Gear engages the third and fourth racks. Thus, the height variability of the telescopic leg can be increased in a small space requirement and the efficiency of the stroke caused by the gas spring can be improved.

For example, in order to guide cables for actuation of the gas spring by the telescoping leg and thus to improve the visual appearance of the leg, the leg, in particular the inner tube may have an axial channel.

The piece of furniture according to the invention comprises at least one telescopic leg of the type described above. In this way, the height of the piece of furniture can be adapted to a given requirement. In a preferred embodiment, the piece of furniture is a table or a chair.

Embodiments of a telescopic leg according to the invention are shown schematically simplified in the drawing and are explained in more detail in the following description. 1 shows a perspective view of a chair with a telescopic

 Leg of the invention;

Figure 2 is a perspective view of a table with two telescopic

 Legs according to the invention;

Figure 3 is a side view of a first embodiment of a telescopic

 Leg according to the invention in an insertion position;

Figure 4 is a view corresponding to Figure 3, but in an intermediate position;

Figure 5 is a view corresponding to Figure 3, but in an extended position;

Figure 6 is a longitudinal section through the telescopic leg in the position according to

 FIG. 3;

Figure 7 is a longitudinal section through the telescopic leg in the position according to

Figure 4; FIG. 8 shows a perspective catching section through the telescopic leg in the position according to FIG. 4;

FIG. 9 shows a longitudinal section through the telescopic leg in the position according to FIG

 Figure 5; Figure 10 is a side view of a second embodiment of a telescopic

 Leg according to the invention in an insertion position;

Figure 11 is a view similar to Figure 10, but in an intermediate position;

Figure 12 is a view similar to Figure 10, but in an extended position;

FIG. 13 shows a cut through the telescopic leg in the position according to FIG

 Figure 10;

Figure 14 is a Fängsschnitt through the telescopic leg in the position according to

 FIG. 11;

FIG. 15 shows a perspective catching section through the telescopic leg in FIG

 Position according to FIG 11; FIG. 16 is a cross-sectional view through the telescopic leg in the position according to FIG

 FIG. 12.

In Figure 1, a chair 1 is shown, which has a round cross-section having telescoping leg 10. The leg 10 is connected to a connecting element 48, which is arranged at an upper end of an inner tube 16 of the leg 10, with a Sitzele- element 110. At a lower end or in a lower region of an outer tube 12, the leg 10 is attached to a foot 112, in particular a base.

Figure 2 shows a table 2 with two telescopic legs 10. The telescopic legs 10 each have a circular cross section and are connected at an upper end of an inner tube 16 in each case via a connecting element 48 with a table top 120. At a lower end of an outer tube 12, the two legs 10 each arranged on a table base 122 which extends in the cross-section of the tabletop.

FIGS. 3 to 9 show a first embodiment of a telescoping leg 10 of the kind of a piece of furniture according to the invention shown in FIGS. 1 and 2. The leg 10 is shown in FIGS. 3 to 5 in a side view in different positions, namely an insertion position (see FIG. 3), an intermediate position (see FIG. 4) and an extension position (see FIG. 5). FIGS. 6 to 9 each show a section through the telescoping leg 10 in the mentioned positions. The leg 10 comprises an outer tube 12, an intermediate tube 14 and an inner tube 16. The tubes 12, 14 and 16 can be displaced by means of a gear 18 and a gas spring 20 in the tube longitudinal direction relative to each other, wherein the inner tube 16 relative to the outer tube 12 performs a stroke , which is a multiple of the stroke of the gas spring 20. The transmission 18 comprises two deflection rollers 38 mounted on the intermediate pipe 14. The deflection rollers are arranged in an upper and in a lower region of the intermediate pipe. For the storage of the deflection rollers 38, the intermediate tube 14 is flattened on one side, on which the deflection rollers 38 are arranged. The gear 18 also includes a belt 32. The belt 32 is guided by the pulleys 38 and is at an upper portion of an inner side of the outer pipe 12 and a lower

Area fixed to an outer side of the inner tube 16. A fixation of the belt 32 on the outer tube 12 and the inner tube 16 takes place via a clamping connection 34 and 36, respectively.

The gas spring 20 comprises a piston 50, which is connected in an upper portion by means of a coupling element 22 to the intermediate tube 14. Thus, the intermediate pipe 14 is subjected to an upstroke or a downstroke depending on an operation. By activation or release of the gas pressure spring 20, the stroke of the gas pressure spring 20 via the piston 50 and the coupling element 22 on the intermediate tube 14 transmis conditions.

In a first type of operation of the gas spring 20, the intermediate tube 14 undergoes an upward stroke, so that it is displaced in an axial vertical direction relative to the outer tube 12. Such displacement in the axial direction causes movement of the belt 32 about the pulleys 38, wherein the movement takes place in the counterclockwise direction in the view selected in the drawing. By the movement of the belt 32 counterclockwise, the inner tube 16 is moved from the intermediate tube 14 and the outer tube 12 in the axial direction of the tube until the telescoping leg

10 has a desired height.

In a second type of operation, the intermediate tube 14 undergoes a downward stroke via the coupling element 22, so that the leg 10 is moved from the extension position or the intermediate position in the direction of the insertion position, with the belt 32 moving in the clockwise direction.

FIGS. 10 to 16 show a second embodiment of a telescoping leg 10 of the type according to the invention shown in FIGS. 1 and 2, leg 10 being shown in FIGS. 10 and 13 in an inserted position, in FIGS. 11, 14 and 15 is in an intermediate position and in Figures 12 and 16 in an extended position.

Since the structure of the second embodiment of the telescopic leg 10 is similar to the structure of the first embodiment, only differences will be explained below.

A coupling element 22, which serves to transmit a generated by a gas spring 20 stroke, comprises two racks 40 and 42 and a gear 44. Die

Rack 40 is disposed on an inner side of the outer tube 12. The rack 42 is located on an outer side of the inner tube 16. The rack 40 and the rack 42 are opposite in a tube radial direction. In an axial tube direction, the racks 40 and 42 are arranged such that in the Insertion position, a lower portion of the rack 40 with an upper portion of the rack 42 overlaps in a projection in the radial direction. In the extended position is an upper portion of the rack 40 at the level of a lower portion of the rack 42. Between the two racks 40 and 42, the gear 44 is mounted on the intermediate tube 14. The gear 44 is engaged with the two racks 40 and 42, so that the stroke of the gas spring 20 is transmitted from the intermediate tube 14 to the inner tube 16 and the inner tube 16 experiences a stroke which is a multiple of the stroke of the gas spring 20. In a first type of activation or actuation of the gas spring 20, the intermediate tube 14 experiences an upward stroke, whereas in a second type of activation of the gas spring 20, the intermediate tube 14 experiences a downward stroke.

If the intermediate tube 14 experiences an upward stroke and if the leg 10 is in the insertion position or an intermediate position, the stroke is transmitted to the intermediate tube 14 via the coupling element 22. The transmitted to the intermediate tube stroke causes a displacement of the intermediate tube 14 relative to the outer tube 12 in the axial vertical direction. By the relative movement of the intermediate tube 14 relative to the outer tube 12 and by the meshing of the gear 44 and the toothed rack ge 40 rotates the gear 44 and moves in the axial vertical direction. At the same time, the inner tube 16 undergoes an upward stroke due to the rotational movement of the gear 44. As a result, the inner tube 16 is displaced in the axial direction and the height of the leg 10 is changed.

In a height adjustment of the leg 10 from the extended position or from an intermediate position to an intermediate position or in the insertion position, the intermediate tube 14 is subjected to a downward stroke. The downward stroke is in turn transmitted to the inner tube 16 via the racks 40 and 42 and the gear 44. LIST OF REFERENCE NUMBERS

1 chair

 2 table

 10 leg

12 outer tube

 14 intermediate pipe

 16 inner tube

 18 gears

 20 gas spring

22 coupling element

 24 cover element

 26 cover element

 32 straps

 34 clamp connection

36 clamping connection

 38 pulley

 40 rack

 42 rack

 44 gear

48 connecting element

 50 pistons

 110 seat area

 112 feet

 120 tabletop

122 table base

Claims

claims A telescoping leg for a piece of furniture, comprising an outer tube (12) extending along an axis, at least one disposed in the outer tube (12) Intermediate tube (14), an inner tube (16) which is arranged in the intermediate tube (14), a gas pressure spring (20) and a gear (18), characterized in that  the gas spring (20) causes a stroke and the gear (18) causes the inner tube (16) relative to the outer tube (12) performs a stroke, the one Many times the stroke of the gas spring (20). 2. Telescopic leg according to claim 1, characterized in that the stroke of the gas spring (20) acts on the intermediate tube (14). 3. Telescopic leg according to claim 1 or 2, characterized in that a coupling element (22) transmits the stroke of the gas spring (20) on the intermediate tube (14). 4. Telescopic leg according to one of claims 1 to 3, characterized in that the gas pressure spring (20) comprises a locking device. 5. Telescopic leg according to one of claims 1 to 4, characterized in that the transmission (18) comprises a belt (32) and at least two deflection rollers (38). 6. Telescopic leg according to one of claims 5, characterized in that the belt (32) on the outer tube (12) and on the inner tube (16) is fixed and on the intermediate tube (14), the two deflection rollers (38) are rotatably mounted , 7. Telescopic leg according to one of claims 1 to 4, characterized in that the transmission (18) comprises a gear (44) and at least two racks (40, 42) which are in each case with the gear (44) in engagement. 8. Telescopic leg according to claim 7, characterized in that the first rack (40) on an inner side of the outer tube (12) and the second toothed rack ge (42) on an outer side of the inner tube (16) are arranged and the gear (44). is mounted on the intermediate tube (14). 9. Telescopic leg according to one of claims 1 to 8, characterized by at least a second intermediate tube, which in the first intermediate tube (14) and around the inner tube (16) is arranged, wherein the transmission (18) causes the second Intermediate tube relative to the outer tube (12) performs a stroke which is a Vielfa Ches the stroke of the gas spring (20). 10. Telescopic leg according to claim 9 in conjunction with claim 5 or 6, characterized in that the transmission (18) comprises a third and a fourth deflection roller, which are each rotatably mounted on the second intermediate tube, and a second belt, the is fixed to the first intermediate tube (14) and the inner tube (16). 11. Telescopic leg according to claim 9 in conjunction with claim 7 or 8, characterized in that the transmission (18) a second gear, which is mounted in the second intermediate tube, and a third on the first intermediate tube (14) arranged rack and a fourth rack, which is arranged on the inner tube (16). 12. Telescopic leg according to one of claims 1 to 11, characterized in that the inner tube (16) has an axial channel. 13. Piece of furniture comprising at least one telescopic leg (10) according to one of Claims 1 to 12. 14. Piece of furniture according to claim 13, wherein the piece of furniture is a chair (1) or a table (2).