Height-adjustable table frame with a radially mountable synchronizing shaft

Abstract

The invention relates to a table frame with a shaft for synchronizing the height adjustment of two columns. Outer shaft segments are each coupled to a telescopic drive in the respective columns. A change in column length causes the outer shaft segments to rotate, and vice versa. A main segment (middle segment) of the shaft can be coupled to the outer shaft segments. The main segment can be positioned relative to the outer shaft segments with a movement that has a component in the radial direction to the axes of the outer shaft segments, in order to bring coupling surfaces into contact with one another and / or to align the shaft segments coaxially. A purely axial movement of the main segment relative to the outer shaft segments is not required to connect the shaft segments.

Description

Background of the invention

[0001] The invention relates to a table frame comprising two telescopically extendable columns, each with at least two column sections movable relative to each other, wherein each of the columns has a telescopic drive connecting the respective column sections, wherein the two telescopic drives are coupled to each other via a shaft with two outer segments and a main segment for synchronizing the telescopic movements, wherein the two outer segments of the shaft are each rotatably mounted on a first of the two column sections of the two columns and are coupled to the respective telescopic drive, and wherein at least one of the outer segments and at least one end region of the main segment each have at least one coupling surface.

[0002] Such table frames are known from the prior art, for example DE 10 2013 208 559 A1.

[0003] With mechanically height-adjustable table frames, the two columns must be coupled together to force a uniform height adjustment and avoid misalignment of a tabletop.

[0004] In the table frame known from the aforementioned DE 10 2013 208 559 A1, a gas spring engages the shaft to enable height adjustment with minimal effort. In other table frames, a lockable gas spring is arranged in only one of the columns; compare, for example, DE 10 2009 007125 A1. In all these designs, smooth extension and retraction of the columns with the tabletop horizontally aligned must be ensured.

[0005] In the prior art, the connection of the outer shaft segments and the main segment is achieved by first arranging these segments coaxially and then bringing them into overlap through a purely axial movement. This requires that at least one of the columns is not yet attached to a tabletop while its shaft segment is coupled to the main segment. Figure 1The diagram schematically illustrates, for a table frame known from DE 10 2013 208 559 A1, how a hollow main segment 2 of a shaft is pushed axially 4 onto an outer shaft segment 6 after these shaft segments have been previously aligned coaxially with each other on a common axis 8. For a rotary coupling, the shaft segments can have a square cross-section, with the outer shaft segment 6 being inserted into the main segment 2. Surfaces on the inner circumference of the main segment 2 then interact with surfaces on the outer circumference of the outer shaft segment 6 to provide the coupling. The outer shaft segment 6 is rotatably mounted on a column (not shown in detail). Object of the invention

[0006] One objective of the invention is to simplify the assembly of table frames with synchronously height-adjustable columns. Description of the invention

[0007] This problem is solved according to the invention by a table frame according to claim 1, a table frame according to claim 12 and a table according to claim 21. Advantageous embodiments are specified in the respective dependent claims and the description.

[0008] According to the invention, a table frame is provided. The table frame has two telescopic columns, each with at least two column sections that are movable relative to each other. The columns can have more than two, for example three, column sections that are movable relative to each other. By moving the column sections relative to each other, the columns can be telescoped to adjust their height.

[0009] Each column has a telescopic drive that connects the column sections of that column. The two telescopic drives are coupled via a shaft with two outer segments and a main segment for synchronizing the telescopic movements. In other words, the shaft is multi-part. The two outer segments of the shaft are each rotatably mounted on one of the first column sections of the two columns and are coupled to the respective telescopic drive. A rotation of one of the outer shaft segments causes a change in the length of the corresponding column via the telescopic drive. Conversely, a change in the length of the column causes a rotation of the corresponding outer shaft segment via the telescopic drive. The shaft transmits the change in length of one column to the other. In this way, it is mechanically ensured that the columns are always extended or retracted to the same extent.The wave can therefore also be called a synchronous wave.

[0010] The inventors have recognized that the shaft segments can be designed in such a way that their positioning relative to one another can be achieved with an assembly movement that includes at least one component directed radially to the axes of the two affected shaft segments. The assembly movement for aligning the shaft segments can be purely radial. Depending on the design of the shaft segments, a pivoting movement can be added, which can be performed during or after the radial movement, and which can, in particular, occur about a pivot axis oriented perpendicular to the two segment axes. Instead of, or in addition to, the pivoting movement, an axial movement component can also be added.In any case, the assembly movement, by which the shaft segments are brought into contact with each other or are aligned coaxially to each other for fastening by means of further elements, can be carried out with a movement directed radially to the axis of at least one of the shaft segments with at least one component.

[0011] The radial direction refers to the axis of at least one of the shaft segments; typically, the assembly movement can be performed with one component radial to the axes of both shaft segments. The axis refers to the axis of rotation of the shaft segments in the assembled state.

[0012] It is understood that the mobility of the main segment relative to the outer segment is subject to fewer restrictions if none of the outer segments have yet been brought into contact with, and in particular connected to, the main segment. According to the invention, the shaft segments are designed such that the described assembly movements are possible; however, in individual cases, it is conceivable that these radial assembly movements are not strictly necessary. Nevertheless, assembly movements other than radial ones are generally not readily possible if the main segment is already connected to one of the outer segments at one end. In particular, the described radial assembly movements are generally necessary for mounting the other end of the main segment to the other outer segment due to the design.

[0013] Simplified assembly, especially for columns already mounted or pre-assembled on a tabletop, can be achieved through various designs of the wave segments and, if necessary, additional elements for connecting the wave segments to each other.

[0014] In a first embodiment of the table frame according to the invention, at least one of the outer segments and at least one end region of the main segment each have at least one coupling surface. By bringing the coupling surfaces into contact with one another, a rotary coupling is established between the shaft segments. The second of the outer segments and a second end region of the main segment can also be designed like the first outer segment and the first end region and can be coupled to one another in the same way.

[0015] In the first embodiment, the coupling surfaces can be brought into axial contact with one another by movement with a component in a radial direction. In other words, the shaft segments can be brought into contact with each other by a movement that is at least partially radial, with the coupling surfaces overlapping each other in the axial direction. The axial contact of the coupling surfaces can be established before or during the movement with the radial component.

[0016] The coupling surfaces can be flat or curved. In particular, a coupling surface on one of the wave segments can be flat and the corresponding coupling surface on the other wave segment can be convexly curved. Both adjacent coupling surfaces can also be flat.

[0017] The coupling surfaces can be held in contact with each other by a fixing element. This ensures that the contact between the coupling surfaces is maintained during operation, especially when the shaft rotates. The fixing element is typically engaged after the coupling surfaces have been brought into contact by the movement of the radial component. Alternatively, the fixing element can be engaged while the coupling surfaces are being brought into contact by the movement of the radial component.

[0018] The fixing element can engage with a recess in at least one of the segments. In particular, with coaxial alignment of the segment axes, the adjacent coupling surfaces and the fixing element engaging in the recess can prevent translational relative movements of the two segments against each other in all radial directions. Thus, the coupling surfaces do not lose contact by lifting off each other or by sliding against each other. Purely axial translational movements do not need to be prevented by the fixing element, since an outer segment of the shaft is arranged on both sides of the main segment, thereby limiting or preventing axial movements of the main segment.

[0019] In the first stage of development, each segment has at least one recess for the engagement of the fixing element. The recesses can extend radially to the axes of the adjacent segments. The recesses can project through the coupling surfaces. The fixing element, engaging in the recesses of both segments, prevents relative movement of the segments in at least one first plane by means of a positive locking mechanism. This first plane is oriented perpendicular to the direction of extension of the fixing element and the recesses.

[0020] The fixing element can be a screw. This allows the coupling surfaces to be pressed against each other. Relative movements along the direction of extension of the fixing element and the recesses are then prevented. The recess of one of the segments can be provided with an internal thread for engagement of an external thread of the screw. Alternatively, a nut can be supported against one of the segments.

[0021] In a second refinement, the fixing element is an axially extending projection on one of the segments. The recess for the engagement of the fixing element extends axially into the other segment. This design allows for tool-free assembly of the segments. In particular, a pivoting movement can engage the projection with the recess and simultaneously align the axes of the segments coaxially, after the coupling surfaces have been brought into contact by the movement of the radial component.

[0022] Advantageously, one of the segments has two mutually oriented coupling surfaces for the overlapping of two mutually oriented coupling surfaces of the other segment. This prevents the coupling surfaces from separating from each other without further fixing. A fixing element then only needs to block radial sliding of the coupling surfaces. The coupling surfaces can be aligned parallel to each other. The direction of the radial component is then parallel to the coupling surfaces.

[0023] A slot formed between the opposing coupling surfaces can be open on one side and closed on the other in the radial direction. This further simplifies assembly, as the segment with the opposing coupling surfaces is inserted into the slot from the open side.

[0024] The coupling surfaces of the segments can extend with a component transverse to the radial direction of the movement used to bring the coupling surfaces together. Thus, the coupling surfaces can be brought together with a movement whose direction includes an angle greater than zero, particularly approximately 90°, with the coupling surfaces. This can reduce the required precision when performing this movement manually.

[0025] The shaft segments can each have two coupling surfaces angled relative to each other. The intersection line of the coupling surfaces can coincide with the axis of the segments. Due to the V-shaped design of the coupling surfaces, the shaft segments are centered against each other perpendicular to the direction of the angle bisector between the coupling surfaces. A fixing element is only required to prevent the coupling surfaces from separating.

[0026] The main shaft segment can be formed from a tube. This saves weight without significantly reducing torsional stiffness. Furthermore, a tubular main segment can simplify the design of the coupling surfaces in various ways.

[0027] In one variant, the coupling surface of the main segment is formed on a pressed-in or compressed section of the tube. This allows for particularly efficient manufacturing of the main segment. This variant is especially suitable for fixing the segments using a screw.

[0028] In another variant, the tube has a rectangular cross-section with a partial circumferential cutout. At least one coupling surface is formed in the uncut circumferential area on the inner circumference of the tube. Such a main segment can also be manufactured efficiently. The outer segment can have a corresponding rectangular cross-section for engaging with the partially cutout area of ​​the main segment.

[0029] The coupling surface of the main segment can be formed on an insert element, which can be inserted axially into a main section, preferably a tubular one. Such an insert element can be manufactured with exceptional precision, while the main section can be produced with particular efficiency. Furthermore, the use of an insert element makes it possible to couple structurally identical main sections of the main segment with different outer segments. Only insert elements matching the outer segment need to be provided.

[0030] The insert element can have a nose that can be inserted into a recess in the main part. In this way, a stop can be easily set up, defining the axial position of the insert element in the main part. At the same time, a rotary coupling can be established between the insert element and the main part.

[0031] A method according to the invention for assembling the first embodiment of the table frame may comprise the following steps: A) Aligning the segments so that their axes lie in a common plane but are not coaxial with each other; B) Moving the segments in the common plane to align the coupling surfaces and align the axes coaxially.

[0032] In step A), the segments are aligned, in other words, so that their axes are parallel, offset from each other, or inclined relative to each other in the common plane. Aligning the axes in the common plane can simplify the subsequent coaxial alignment of the segments. This is particularly useful if one of the segments has two mutually converging coupling surfaces for the bilateral overlap of two mutually diverging coupling surfaces of the other segment.

[0033] The movement of the segments relative to each other in step B) includes movement with a component in the radial direction with respect to the axes of the segments. This movement can include translational movement in the radial direction to one or both segments. Alternatively or additionally, the movement can include pivoting movement in the common plane.

[0034] If at least one of the columns can be locked onto a longitudinal beam by means of a pivoting movement, the pivoting movement can include pivoting the column relative to the longitudinal beam. The pivoting movement can further include pivoting the main segment relative to the longitudinal beam.

[0035] By pivoting a column with an outer segment of the shaft relative to the longitudinal beam, and simultaneously pivoting the main segment relative to the longitudinal beam—particularly with the other end of the main segment already abutting the other outer segment—the coupling surfaces can be aligned and, at the same time, an axial projection can be inserted into an axial recess as a fixing element. Two simple partial movements of the main segment of the shaft and one of the columns are thus sufficient to align and fix the shaft segments relative to each other, as well as to secure the column to the longitudinal beam in a working position.

[0036] If each segment has at least one recess for the engagement of the fixing element, the fixing element can be inserted into the recesses of the adjacent segments in step C). If the fixing element is a screw, it is then tightened.

[0037] In a second embodiment of the table frame according to the invention, at least one of the outer segments, preferably both outer segments, and the main segment can be arranged coaxially to each other by a movement with a component in a radial direction, such that the respective end faces define a dividing line between the segments. In this way, particularly when the two columns are already mounted on a tabletop, the main segment can be aligned relative to both outer segments by a movement in a strictly radial direction.

[0038] A sliding sleeve is movable across the dividing line to couple the segments together. The axial movement of the sliding sleeve occurs relative to the shaft segments after the shaft segments have been aligned coaxially with the radial movement. A rotary coupling of the segments can be established via the sliding sleeve.

[0039] A fixing element, in particular a screw or a pin, can be provided for fixing the sliding sleeve to at least one of the segments. Specifically, the fixing element can engage in recesses in the sliding sleeve and in one of the segments. This secures the axial position of the sliding sleeve. Furthermore, the sliding sleeve can be connected to the shaft segment without play in the direction of rotation. A second fixing element, in particular a second screw or a second pin, can be provided. The second fixing element can engage in second recesses in the sliding sleeve and the other segment. In this way, the sliding sleeve can also be connected to the other shaft segment without play in the direction of rotation. Alternatively, a backlash-free connection of the shaft segments could also be achieved, for example, by selecting suitable fits.

[0040] Preferably, the sections of the segments covered by the sliding sleeve are not rotationally symmetrical with respect to their axes. A rotary coupling is then achieved without further fixing of the sliding sleeve to the adjacent shaft segments. The sections covered by the sliding sleeve can have a polygonal cross-section, in particular a rectangular one, advantageously a square one. It is understood that the cross-sectional shape refers to the outer surfaces of the shaft segments and the inner surface of the sliding sleeve.

[0041] In the second embodiment, the main segment of the shaft can also be formed with a tube.

[0042] A method according to the invention for assembling the second embodiment of the table frame may comprise the following steps: K) Coaxial alignment of the segments by a movement with a component in the radial direction, so that the end faces of the segments abut each other at the parting line; L) Advancement of the sliding sleeve so that the sliding sleeve bridges the parting line and couples the adjacent segments together.

[0043] Step K) can be carried out, in particular, after both columns have been attached to a longitudinal beam or a tabletop. In step L), two sliding sleeves are then moved across a respective dividing joint to couple the main segment to both outer segments.

[0044] In both embodiments, the main shaft segment can be multi-part, comprising at least two sections that can be rigidly coupled together. A multi-part main segment can be disassembled for transport. In particular, it may be possible to package the sections together with the columns without increasing the external dimensions of the packaging. The main segment can be assembled from the sections before being connected to the outer segments.

[0045] In a first further development, a central piece can be inserted into the facing ends of the segments, in particular wherein the central piece has a rotary driver for each of the segments and / or wherein the axially facing end surfaces of the segments have projections and recesses for a positive-locking rotary coupling. In this way, a precise connection of the two segments can be created.

[0046] In another embodiment, the two segments can be connected by means of a sliding sleeve. A further fixing element, in particular a screw or a pin, can be provided to fix the sliding sleeve to at least one of the segments. Specifically, this further fixing element can engage in recesses in the sliding sleeve and one of the segments. This secures the axial position of the sliding sleeve. Furthermore, the sliding sleeve can be connected to the segment without play in the direction of rotation. A further second fixing element can be provided, in particular a second screw or a second pin. This second fixing element can engage in a second recess of the sliding sleeve and the other segment. In this way, the sliding sleeve can also be connected to the other segment without play in the direction of rotation.Alternatively, a backlash-free connection of the sections could also be achieved, for example, by selecting suitable fits.

[0047] The telescopic drives in the two columns can each have a circulating traction element, in particular a chain or a toothed belt, which is guided over an upper and a lower deflection pulley on the respective first column section and is connected to the respective second column section. The deflection pulleys can be gears or pulleys. When the column sections are moved relative to each other, the circulating traction element sets the deflection pulleys in rotation. Conversely, rotation of the deflection pulleys forces a movement of the column sections relative to each other. The outer shaft segments are typically rigidly coupled to the upper deflection pulleys. In particular, the upper deflection pulleys and the outer shaft segments could be arranged coaxially. The upper deflection pulleys can be mounted on the outer shaft segments or be integral with them.

[0048] The table frame can have a gas spring, preferably lockable, which is supported between the column sections of one of the columns. The gas spring can at least partially compensate for the weight of a tabletop and the height-adjustable part of the table frame during height adjustment. By locking the gas spring, the table frame can be fixed at various heights. The synchronization of the two table legs via the telescopic drives and the shaft ensures that both columns extend and retract evenly. Furthermore, due to this coupling, the second column, which does not have a lockable gas spring, cannot lower or extend when the gas spring in the first column is locked.

[0049] The table frame can have a longitudinal support. The longitudinal support can connect the two columns.

[0050] The columns can be attached to the longitudinal beam. In particular, the columns can be locked onto the longitudinal beam by a pivoting motion. In a table frame of the first embodiment, the pivoting motion for locking one of the columns onto the longitudinal beam can simultaneously cause a fixing element, in the form of an axial projection on one shaft segment, to pivot into an axial recess on the other shaft segment. Typically, a first column is first locked onto the longitudinal beam. Then, the main segment of the shaft is attached to the outer shaft segment of the first column. Subsequently, the second column is positioned at an angle on the longitudinal beam, for example, with pins of the column being inserted into slots on the longitudinal beam to define the pivot axis. Then, the main segment and the second outer shaft segment are brought close together by pivoting them radially towards the longitudinal beam with respect to their (rotational) axes. In doing so, the coupling surfaces come into contact with each other.Finally, the projection is inserted into the recess, while the pivoting movements of the shaft segments relative to each other and to the longitudinal beam ensure the final alignment of all components. The insertion of the projection into the recess occurs with an axial displacement of the coupling surfaces of the two shaft segments relative to each other, while simultaneously the coupling surfaces move radially to the axis of their respective segments.

[0051] The table frame can have two crossbeams extending perpendicular to the longitudinal beam.

[0052] The present invention also encompasses a table with a table frame and tabletop as described above. The tabletop can be supported on the crossbeams and / or the longitudinal beam.

[0053] Further features and advantages of the invention will become apparent from the description, the claims, and the drawings. According to the invention, the features mentioned above and those further elaborated can each be used individually or in any suitable combination. The embodiments shown and described are not to be understood as an exhaustive list, but rather serve as examples for illustrating the invention. Detailed description of the invention and drawing

[0054] The invention is illustrated in the drawing and described using exemplary embodiments. Fig. 1 shows a schematic diagram of the axial joining of two shaft segments in a table frame from the prior art; Fig. 2 shows a table according to the invention with a table frame according to the invention, in a schematic perspective view; Fig. 3 shows a schematic diagram of a table according to the invention while a main segment of a shaft is arranged by a radial assembly movement on outer segments of the shaft, which are rotatably mounted on telescopic columns; Fig. 4 shows a first variant of the coupling of two radially mountable shaft segments, in a schematic exploded view; Fig. 5a shows a second variant of the coupling of two radially mountable shaft segments, in a schematic exploded view; Fig. 5b shows a further schematic perspective view of one of the shaft segments made of Figure 5aFig. 6 shows a third variant of the coupling of two radially mountable shaft segments, in a schematic exploded view; Fig. 7 shows a fourth variant of the coupling of two radially mountable shaft segments, in a schematic exploded view; Fig. 8 shows a multi-part shaft segment with two sections connectable by a sliding sleeve, in a schematic exploded view; Fig. 9 shows a fifth variant of the coupling of two radially mountable shaft segments, with a tubular main piece in which an insert element for direct contact with an outer shaft segment can be received, in a schematic exploded view; Fig. 10a shows a sixth variant of the coupling of two radially mountable shaft segments, with a tubular main piece in which an insert element for direct contact with an outer shaft segment with an axial recess can be received, in a schematic exploded view; Fig.Figure 10b shows the insert element from Figure 11a in a schematic perspective view, where an axial projection for engaging in the axial recess is visible; Figure 10c shows the shaft segments from Figure 11a during assembly, in a schematic side view; Figure 11 shows a schematic diagram of another table frame according to the invention, in which a column with an outer shaft segment and a main segment of the shaft are moved radially with respect to their axes by a pivoting motion and are brought into axial overlap; Figure 12 shows a seventh variant of the coupling of two radially mountable shaft segments, in a schematic exploded view; Figure 13 shows a multi-part shaft segment with two sections connectable via a central piece, in a schematic exploded view.

[0055] Figure 2 shows a table 10. A tabletop 12 is on a table frame20 The table frame 20 has two height-adjustable columns (legs). 22a, 22b on.

[0056] Columns 22a and 22b each comprise a first, here upper, column part. 24 and a second, lower, column section 26. In this case, the upper column sections 24 are guided in the lower column sections 26. A longitudinal beam 28 connects the upper column sections 24 to each other. In particular, the columns 22a, 22b can be attached to the longitudinal beam 28.

[0057] At the ends of the longitudinal beam 28 and at the top of the two columns 22a, 22b there are two crossbeams. 30 The tabletop 12 rests on the crossbeams 30 and can be screwed to them.

[0058] Foot brackets can be attached to the bottom of columns 22a and 22b. 32 be attached.

[0059] Each of the two columns 22a and 22b contains a telescopic drive. 34 arranged. In Figure 2Only the telescopic drive 30 of column 22a is visible. The telescopic drives 34 of both columns 22a and 22b are also shown in Figure 3 sketched. It should be noted that for the assembly of the table frame 20, the tabletop 12 is typically placed with its top side on the floor.

[0060] The telescopic drives 34 each include an upper and a lower deflection pulley. 36, 37, For example, pulleys or gears that are rotatably mounted on the first column sections 24. A fully enclosed traction element. 38, For example, a toothed belt or a chain is guided over the two deflection pulleys 36, 37. The circulating traction element 38 is fixed at a point between the two deflection pulleys 36, 37 on the second column section 26. A retaining rod can be used for this purpose. 40 extend from the base of the second column section 26 into the first column section 24; this is in Figure 3shown for column 22b. Alternatively, the circulating traction element 38 can be attached to a cylinder. 42 a gas spring 44 be attached; this is in the Figures 2 and 3 The arrangement is shown for column 22a. The cylinder 42 of the gas spring 44 is attached to the second column section 26. A piston rod 46 The gas spring 44 is attached to the first column section 24. The gas spring 44 reduces the force required to adjust the height of the table 10. Preferably, the gas spring 44 can be locked.

[0061] When the height of the table 10 is adjusted, the traction element 38, held on the respective second column section 26, sets the two deflection pulleys 36, 37 into rotation. Conversely, a rotation of one of the deflection pulleys 36, 27 also causes a rotation of the other deflection pulley 36, 37 and a change in the length of the respective column 22.

[0062] The upper deflection pulleys 36 are each equipped with an outer shaft segment 48a, 48b (also together with the reference symbol) 48 (designated) a wave 50 coupled. For example, the upper deflection rollers 36 can be positively engaged on the outer shaft segments 48. The outer shaft segments 48, together with the upper deflection rollers 36, are rotatably mounted in the upper column sections 24. A main segment 52 The shaft 50 connects the two outer shaft segments 48. Thus, any change in length of the two columns 22a, 22b always occurs synchronously.

[0063] At the in Figure 3 In the illustrated embodiment of the table frame 20, the outer shaft segments 48 each have coupling surfaces. 54 for installation on suitable coupling surfaces 56of the main segment 52. The coupling surfaces 54, 56 overlap each other in the axial direction. To align the coupling surfaces 54, 56, the main segment 52 can be moved radially to the axes. 58 the outer shaft segments 48 as well as radially to its axis 60 the outer shaft segments 48 are approached. This assembly movement is in Figure 3 with an arrow 62 As indicated. When the coupling surfaces 54, 56 are adjacent to each other, the axes 58, 60 are aligned coaxially with each other.

[0064] Some variations of this embodiment are described below.

[0065] At the in Figure 4 In the variant shown, the main segment 52 has a tubular main piece. 64 on, in whose open ends each an insert element 66 It can be used. A rotary coupling of main piece 64 and an insert element 66 can be secured by a fixing element. 68 in the form of a screw with a nut 69This is done. The fixing element 68 extends through the holes in the assembled state. 70, 71 in the main section 64 and the insert elements 66.

[0066] The insert element 66 has two coupling surfaces angled towards each other. 56.1, 56.2 The outer wave segments each have two coupling surfaces angled towards each other, corresponding to one another. 54.1, 54.2 The coupling surfaces 56.1, 56.2 on the main segment 52 are convexly oriented. The coupling surfaces 54.1, 54.2 on the outer shaft segments 48 are correspondingly concave. The inclined coupling surfaces 54.1, 54.2, 56.1, 56.2 are oriented obliquely to the radial mounting direction 62.

[0067] To fix the coupling surfaces 54, 56 to each other in the radial direction 62 after assembly, a further fixing element 68 in the form of a screw is provided, which has recesses. 72, 74in the respective outer shaft segment 48 and the insert element 66. The outer shaft segments 48 each have a recess for receiving a further nut 69.

[0068] The outer shaft segments 48 each have a bearing seat 76 for a rolling or sliding bearing (not shown) for rotatable mounting in the upper column sections 24. Furthermore, a seat is provided on each of the outer shaft segments 48. 78 designed for the upper deflection roller 36. The seat 78 is shown here as a cylindrical surface. Drivers (not shown in detail) for a positive connection with the deflection roller in the direction of rotation can be provided on the seat 78.

[0069] During the Figures 5a and 5bIn the variant shown, two concave coupling surfaces 56.1, 56.2 are directly impressed into a tubular main segment 52 of the shaft. Coupling surfaces 54.1, 54.2 on outer shaft segments 48 are correspondingly convexly inclined to each other. For further details, please refer to the preceding description. Figure 4 referred.

[0070] At the in Figure 6 In the variant shown, coupling surfaces 56 extending transversely to the radial mounting direction 62 are formed by pressing together end sections of a tubular main segment 52. The outer shaft segments 48 each have a correspondingly flat coupling surface 54 extending radially to their axis 58. A screw with a nut 69 is again provided as a fixing element 68 to fasten the shaft segments 48, 52 together.

[0071] At the in Figure 7In the illustrated variant, a main segment 52 is formed with a tube having a square cross-section. One of the tube's side faces is notched, allowing a square cross-section section of an outer shaft segment 48 to be inserted radially 62 between the three remaining side faces of the tube. For this purpose, three coupling surfaces 54.1, 54.2, 54.3 on the outer circumference of the outer shaft segment 48 and three coupling surfaces 56.1, 56.2, 56.3 formed on the inner circumference of the main segment 52. The coupling surfaces 56.1 and 56.2 point towards the axis of the main segment 52 and overlap the coupling surfaces 54.1 and 54.2, which point away from the axis of the outer shaft segment 78.

[0072] As a fixing element 68, a screw in the assembled state passes through recesses 74 in the two opposing side surfaces of the main segment and a recess 72 in the outer shaft segment 48.

[0073] The main segment 52 can be used as in Figure 8 It is shown to be multi-part. A sliding sleeve. 80 can two sections 82a, 82b The main segment 52 is coupled together. Due to the polygonal cross-section of the sections 82a and 82b, the sliding sleeve creates a rotary coupling. To prevent axial separation during assembly of the main segment 52 on the outer shaft segments 48, two screws 68 can be used as fixing elements, each with holes. 83, 84 in the sliding sleeve 80 and the two sections 82a, 82b.

[0074] At the in Figure 9 In the illustrated variant, two mutually corresponding, parallel coupling surfaces 56.1, 56.2 of a main segment 52 are formed on an insert element 66. The insert element 66 can be inserted axially into a tubular main piece 64 with an annular cross-section. The main piece 64 has a recess in its outer surface. 86The insert element 66 has a nose. 88 which, in the assembled state, engages in the recess 86. The engagement of the nose 88 in the recess forms, on the one hand, an axial stop; on the other hand, a rotary coupling is achieved between the insert element 66 and the main piece 64.

[0075] The insert element 66 is open between the coupling surfaces 56.1, 56.2 at least in a radial direction 62 to allow radial sliding onto a web-shaped section of an outer shaft segment 48 with two coupling surfaces 54.1, 54.2 pointing away from each other.

[0076] In the assembled state, a screw acts as a fixing element 68, passing through recesses 72, 74. 90in the outer shaft segment 48, main piece 64 and insert element 66. In this way, the outer shaft segment 48 is fixed to the main segment 52 in the assembly direction 62 and in the axial direction. In addition, an additional rotary coupling is created between the main piece 64 and the insert element 66.

[0077] Even in the Figures 10a , 10b and 10c In the depicted variant, two mutually assigning coupling surfaces 56.1, 56.2 are formed on insert elements 66. The insert elements 66 are inserted into a tubular main piece 64 of a main segment 52 at both ends. Here, two lugs 88 are provided on the insert element 66 for engagement with recesses 86 of the main piece 64.

[0078] The insert element 66 is located between the coupling surfaces 56.1, 56.2 at least on one side, here on both sides (compare Figure 10b), open in a radial direction 62 to allow radial sliding onto a web-shaped section of an outer shaft segment 48 with two diverging coupling surfaces 54.1, 54.2. The main piece 64 has a corresponding slot. 92 a slot 92 provides radial access between the coupling surfaces 56.1 and 56.2 when the insert element 66 is received in the main piece 64. Opposite the slot 92, the outer surface of the main piece 64 is closed to provide a contact surface for the outer shaft segment 48, particularly during assembly.

[0079] Bores running transversely to the coupling surfaces 56.1, 56.2 in the insert element 66 and in the main piece 64 are without function in this variant; these bores are only present to allow the use of identical parts for different variants.

[0080] The outer wave segments 48 have a recess at the free end between the coupling surfaces 54.1, 54.2. 94 on, which extends in the axial direction from the free end to a bearing seat 76 or a seat 78 for an upper deflection roller 36, compare Figure 10a The insert elements 66 each have an axial projection at the closed end between the coupling surfaces 56.1, 56.2. 96 When the axes 58 and 60 are coaxially aligned, the projection 96 engages in the recess 94. This prevents the main segment 52 and the outer shaft segments 48 from radially separating. The projection 96 thus acts as a fixing element. 98 dar.

[0081] The assembly process of a table frame 20 with this shaft 50 is in Figure 11 illustrated.

[0082] First, a first column 22a is attached to a longitudinal beam 28, for example by pivoting around bolts. 100a, the slots 102aengage the longitudinal beam 28 using a locking hook 104a locked in place. A tabletop 12 (compare) Figures 2 and 3 ) is in for clarity Figure 11 not shown.

[0083] Then, a first end of the main section 52 is brought into engagement with the first outer shaft segment 48a. This can preferably be done in a radial direction or, in principle, also in an axial direction. The main segment 52 is thereby inclined away from the longitudinal member 28 relative to the axis 58 of the first outer shaft segment 48a; see also Figure 10c The axial projection 96 does not yet engage, or at least not completely engage, in the axial recess 94 on the first outer shaft segment 48a.

[0084] The second column 22b is attached to the longitudinal beam 28 by its bolts 100b in slots 102bare introduced so that a pivot axis is defined. Typically, the main segment 52 is first pivoted in the assembly direction with the column 22b held in place or the shaft segment 48b stationary. 108 radially placed onto the second outer shaft segment 48b. The column 22b, or the outer shaft segment 48b, is inclined away from the longitudinal beam 28. The web-shaped section of the second outer shaft segment 48b, with its coupling surfaces 54.1, 54.2, is inserted radially through the slot 92 in the main piece 64 between the coupling surfaces 56.1, 56.2 of the second insert element. 66b introduced. This radial movement already establishes a partial axial overlap of the coupling surfaces 54.1, 54.2, 56.1, 56.2.

[0085] By simultaneously pivoting the column 22b and the main segment 52 in the assembly directions 106,108 The coupling surfaces 54.1, 54.2 on the second outer shaft segment 48b and the coupling surfaces 56.1, 56.2 at the second end or second insert element 66b of the main segment 52 are each moved radially to the axes 58, 60 of their respective shaft segments 48b, 52. At least locally, the coupling surfaces 54.1, 54.2, 56.1, 56.2 of one shaft segment 48b, 52 also move radially to the axis 60, 58 of the other shaft segment 52, 48b via its coupling surfaces 56.1, 56.2, 54.1, 54.2.

[0086] During the assembly movement 108, the main segment 52 is pivoted around the first outer shaft segment 48a, which is inserted into the slot 92 at the first end of the main piece 64 or into the first insert element. 66a intervenes. The closed circumferential area on the main piece 64 opposite the slot 92 acts as a bearing surface.

[0087] The pivoting movements in directions 106, 108 increase the axial overlap of the coupling surfaces 54.1, 54.2, 56.1, 56.2 of the two shaft segments 48b, 52.

[0088] Before all shaft segments 48a, 48b, 52 are coaxially aligned, the axial projections 96 of the insert elements 66a, 66b engage with the axial recesses 94 of the outer shaft segments 48a, 48b. When the shaft segments 48a, 48b, 52 are coaxially aligned, the axial projections 96 of the insert elements 66a, 66b are received in the axial recesses 94 of the outer shaft segments 48a, 48b. The main segment 52 can then no longer detach from the outer shaft segments 48a, 48b.

[0089] When all shaft segments 48a, 48b, 52 reach the coaxial position, the locking hook engages. 104b the second column 22b with the longitudinal beam 28.

[0090] In this variant, tool-free assembly of both columns 22a, 22b and the main segment 52 is possible in the manner described above. This reduces the effort required to assemble the table frame 20.

[0091] In Figure 12 is a wave 50' Another embodiment of a table frame is shown. In this embodiment, a main segment has a 52' and a coupling section 110 of a respective outer wave segment 48' Each has a polygonal, here square, cross-section on its outer circumference. With their axes 58 and 60 arranged coaxially, end faces 112, 114 atop each other. A dividing joint is located between the end faces 112 and 114. 116 trained.

[0092] The width of the dividing joint 116 has been increased here for clarity. For fastening the shaft segments 48', 52' to one another, the end faces 112, 114 can touch each other or have a small gap, in particular no more than 2 mm.

[0093] A sliding sleeve 118 This serves to connect the shaft segments 48' and 52'. For this purpose, the sliding sleeve 118 is moved over the dividing joint 116 so that it overlaps both shaft segments 48' and 52'. Due to the polygonal cross-section, a rotary coupling of the shaft segments 48' and 52' is thus established.

[0094] To keep the sliding sleeve 118 in overlap with the two shaft segments, a fixing element 68 in the form of a screw can be inserted into recesses. 120, 122The outer shaft segment 48' and the sliding sleeve 118 are inserted and tightened by means of a nut 69. Since outer shaft segments 48' are arranged on both sides in the assembled state, the main segment 52' does not need to be secured axially to the outer shaft segments 48'.

[0095] For the assembly of a table frame 20 (compare Figure 2 ) with the in Figure 12Typically, the columns 22a, 22b with the outer shaft sections 48a, 48b are first attached to a longitudinal beam 28 or a table top 12, respectively, on the shaft 50' shown. Then, the main segment 52' is inserted radially between the outer shaft sections 48a, 48b, and their axes 58, 60 are aligned coaxially. With the axes aligned coaxially and the polygonal coupling sections 110 and the main segment 52' in the corresponding rotational position, the sliding sleeves 118 are advanced over the dividing joints 116. Finally, the sliding sleeves can be fixed in place using the fixing elements 68.

[0096] Another multi-part main segment 52 of a wave 50 can be arranged as in Figure 13 Two tubular sections are shown. 124a, 124b exhibiting an exemplary circular cross-section. A central piece 126In its assembled state, it engages the opposing ends of sections 124a and 124b. The end faces of sections 124a and 124b are crown-shaped with projections. 128 and the depressions in between 130. In the assembled state, the projections 128 engage in the recesses 130 of the other section 124a, 124b. A rotary coupling is thus established.

[0097] Additionally, the center piece 126 has two rotary drivers. 132 which are designed here as radial pins. Each of the projections 128 on the two sections 124a, 124b has a notch open at its end face. 134 for an intervention of one of the rotary actuators 132.

[0098] In the axial direction, the sections 124a and 124b can be held on the central section 126 by an interference fit. This is sufficient to mount the main segment 52 to the columns 22a and 22b. At the same time, tool-free assembly and, if necessary, disassembly are possible.

[0099] It should be noted that the divisibility of the main segment 52 is as in the Figure 8 and 13 As shown, the coupling of the main segment 52 with the outer shaft segments 48 can be provided in principle independently of the type of coupling. In particular, the main segment 52' can be made of Figure 12 like the main segment 52 from Figure 8 be divided. According to Figure 13 The multi-part main segment 52 is particularly suitable for use in the Figures 4 , 5 , 6 , 9 and 10 shown variants.

[0100] In summary, the invention relates to a table frame with a shaft for synchronizing the height adjustment of two columns. Outer shaft segments are each coupled to a telescopic drive in the respective columns. A change in the length of the column causes the outer shaft segments to rotate, and vice versa. A main segment (middle segment) of the shaft can be coupled to the outer shaft segments. The main segment can be positioned relative to the outer shaft segments with a movement that has a component in the radial direction to the axes of the outer shaft segments, in order to bring coupling surfaces into contact with one another and / or to align the shaft segments coaxially. A purely axial movement of the main segment relative to the outer shaft segments is not required to connect the shaft segments. Reference symbol list

[0101] Main segment 2 axial direction 4 outer shaft segment 6 common axis 8 table 10 tabletop 12 table frame 20 Columns 22a, 22b first column section 24 second column section 26 longitudinal beam 28 crossbeam 30 Foot boom 32 Telescopic drive 34 upper deflection pulley 36 lower pulley 37 Traction 38 Support rod 40 cylinder 42 Gas spring 44 piston rod 46 outer shaft segment 48a, 48b; 48; 48' Wave 50; 50' Main segment 52; 52' Coupling surfaces 54; 54.1, 54.2, 54.3 of the outer wave segments 48 coupling surfaces 56; 56.1, 56.2, 54.3 of the main segment 52 axes 58 the outer shaft segments 48 axis 60 of the main segment 52 Mounting direction 62 Main piece 64 Deployment element 66; 66a, 66b Fixing element 68 Mother 69 Drilling 70, 71 Exclusions72, 74, 90 bearing seat 76 seat 78 for upper deflection pulley 36 sliding sleeve 80 Sections 82a, 82b Drilling 83, 84 recess 86 Nose 88 slot 92 axial recess 94 axial projection 96 Fixing element 98 bolt 100a, 100b Slots 102a, 102b Latch hook 104a, 104b Mounting directions 106, 108 Coupling section 110 End faces 112, 114 Division joint 116 Sliding sleeve 118 Exclusions 120, 122 Sections 124a, 124b middle section 126 protrusions 128 Depths 130 rotary adapter 132 notch 134

Claims

1. Table frame (20) comprising two telescopic columns (22a, 22b) each with at least two column sections (24, 26) that are movable relative to each other, wherein each of the columns (22a, 22b) has a telescopic drive (34) that connects the column sections (24, 26) to each other, wherein the two telescopic drives (34) are coupled to each other via a shaft (50) with two outer segments (48; 48a, 48b) and a main segment (52) for synchronizing the telescopic movements, wherein the two outer segments (48; 48a, 48b) of the shaft (50) are each rotatably mounted on a first of the two column sections (24) of the two columns (22a, 22b) and are coupled to the respective telescopic drive (34), wherein at least one of the outer segments (48; 48a, 48b) and at least one end region of the main segment (52) each have at least one coupling surface (54, 54.1-54.3, 56, 56.1-56.3) wherein the coupling surfaces (54, 54.1-54.3, 56, 56.1-56.3) can be brought into axial overlap by a movement with one component in a radial direction.

2. Table frame (20) according to claim 1, wherein a fixing element (68; 98) can be brought into engagement with a recess (72, 74, 90; 94) of at least one of the segments (48; 48a, 48b, 52).

3. Table frame (20) according to claim 2, wherein at least one recess (72, 74, 90) for the engagement of the fixing element (68) is formed on each of the segments (48; 48a, 48b, 52), in particular wherein the fixing element is a screw.

4. Table frame (20) according to claim 2, wherein the fixing element (98) is an axially extending projection (96) on one of the segments (52), and wherein the recess (94) for the engagement of the fixing element extends in an axial direction into the other segment (48).

5. Table frame (20) according to one of the preceding claims, wherein one of the segments (52) has two mutually assigning coupling surfaces (56.1, 56.2) for overlapping two mutually pointing coupling surfaces (54.1, 54.2) of the other segment (48; 48a, 48b) on both sides.

6. Table frame (20) according to one of the preceding claims, wherein the coupling surfaces (54, 54.1-54.3, 56, 56.1-56.3) of the segments (48; 48a, 48b, 52) extend with a component transverse to the radial direction of the movement for attaching the coupling surfaces to one another.

7. Table frame (20) according to one of the preceding claims, wherein the segments (48; 48a, 48b) of the shaft (50) each have two coupling surfaces angled relative to each other.

8. Table frame (20) according to one of the preceding claims, wherein the main segment (52) of the shaft (50) is formed with a tube.

9. Table frame (20) according to claim 8, wherein the coupling surface (56; 56.1, 56.2) of the main segment (52) is formed on a pressed or compressed section of the tube.

10. Table frame (20) according to claim 8, wherein the tube has a rectangular cross-section with a partial circumferential notch, and wherein the at least one coupling surface (56.1-56.3) is formed in the non-notched circumferential area on the inner circumference of the tube.

11. Table frame (20) according to one of the preceding claims, wherein the coupling surface (56.1, 56.2) of the main segment (52) is formed on an insert element (66; 66a, 66b) which can be inserted axially into a main piece (64), in particular wherein the insert element (66; 66a, 66b) has a nose (88) which can be inserted into a recess (86) of the main piece (64).

12. Table frame (20) comprising two telescopic columns (22a, 22b) each with at least two column sections movable relative to each other, each column (22a, 22b) comprising a telescopic drive (34) connecting the respective column sections (24, 26) to each other, the two telescopic drives (34) being coupled to each other via a shaft (50') with two outer segments and a main segment (52') for synchronizing the telescopic movements, the two outer segments (48') of the shaft (50') being rotatably mounted on a first of the two column sections (24) of the two columns (22a, 22b) and being coupled to the respective telescopic drive (34), at least one of the outer segments (48'), preferably both outer segments (48'), and the main segment (52') being arranged coaxially to each other by a movement with a component in a radial direction, such that respective end faces (112, 114) a division joint (116) between the segments (48',52') define, and wherein a sliding sleeve (118) is displaceable over the dividing joint (116) to couple the segments (48', 52') together.

13. Table frame (20) according to claim 12, wherein a fixing element (68), in particular a screw or a pin, is provided for fixing the sliding sleeve (118) to at least one of the segments (48').

14. Table frame (20) according to claim 12 or 13, wherein sections of the segments (48', 52') covered by the sliding sleeve (118) are not rotationally symmetric with respect to their axes (58, 60), but are preferably polygonal in cross-section.

15. Table frame (20) according to one of the preceding claims, wherein the main segment (52; 52') of the shaft (50; 50') is formed in multiple parts with at least two sections (82a, 82b; 124a, 124b) that can be rigidly coupled together.

16. Table frame (20) according to claim 15, wherein a central piece (126) can be inserted into mutually facing ends of the sections (124a, 124b), in particular wherein the central piece (126) has a rotary driver (132) for each of the sections (124a, 124b) and / or wherein mutually facing axial end surfaces of the sections (124a, 124b) have projections (128) and recesses (130) for a positive locking rotary coupling.

17. Table frame (20) according to claim 15, wherein the two sections (82a, 82b) can be connected to each other by means of a sliding sleeve (80).

18. Table frame (20) according to one of the preceding claims, wherein the telescopic drives (34) in the two columns (22a, 22b) each have a circulating traction element (38), in particular a chain or a toothed belt, which is guided over an upper and a lower deflection pulley (36, 37) on the respective first column part (24), and which is connected to the respective second column part (26).

19. Table frame (20) according to one of the preceding claims, further comprising a, preferably lockable, gas spring (44) which is supported between the column parts (24, 26) of one of the columns (22a, 22b).

20. Table frame (20) according to one of the preceding claims, wherein the columns (22a, 22b) can be locked onto a longitudinal beam (28) by a pivoting movement.

21. Table (10) comprising a table frame (20) according to one of the preceding claims and a table top (12).

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