EP2910146A1 - Frame of an item of furniture, in particular chair or table frame, and chair or a table with such a frame of an item of furniture - Google Patents

Abstract

A furniture frame (10), in particular a chair or table frame, has a support column (16) with a longitudinal axis (17); a furniture foot (12) for supporting the support column (16); a foot ring (24); and a fastening device with which the foot ring (24) on the support column (16) is adjustably mounted in the axial direction, on. The fastening device includes a first threaded bushing (22), which is arranged coaxially to the support column (16) and rotatably connected to the support column (16) and has an external thread (28); a second threaded bushing (34), which is arranged coaxially to the support column (16) and non-rotatably connected to the foot ring (24) and an internal thread (36), wherein the internal thread (36) of the second threaded bush (34) with the external thread ( 28) of the first threaded bushing (22) is engaged and the second threaded bushing (34) is rotatable about the first threaded bushing (22) by at least one revolution, so that the second threaded bushing (34) moves in the axial direction relative to the first threaded bushing (22) can be; and a locking element (38) which is movable between a first operating position and a second operating position, wherein in the first operating position, a relative movement between the first and the second threaded bushing (22, 34) prevented and in the second operating position, a relative movement between the first and the second threaded bushing (22, 34) releases.

Description

The invention relates to a furniture frame, in particular a chair or table frame, with a support column and an attached foot ring and a chair or table furniture with such a chair or table frame.

Conventional swivel chairs have a central, substantially vertically extending, optionally adjustable support column with a longitudinal axis, which is mounted on a foot (frame) and which carries a seat with (or without) backrest. To increase the comfort for the user, it is known in such swivel chairs to provide above the foot a foot ring on which the seated on the seat user can park his / her feet or his / her feet. The foot ring can also be referred to as a climbing aid, footrest ring or footrest.

For example, the DE 12 82 882 A a swivel chair with a support shaft and a cross-base, wherein a foot ring is provided directly and thus at a fixed predetermined height at the cross-base.

In the DE 10 2006 011 491 B3 Among other things, it is proposed to attach a foot ring to a height-adjustable chair column. Here, the foot ring is placed on the projecting out of the standpipe end of a guide tube by means of a stepped bore, so that at a height adjustment of the chair column at the same time a corresponding height adjustment of the foot ring.

In addition, there is also a need for a foot ring, which is height-adjustable mounted on a support column, the height adjustment of the foot ring independently from a possibly provided height adjustment of the support column, so that the furniture (especially seating or table furniture) can be better adapted to the personal needs and comfort needs of a user.

It is therefore an object of the present invention to provide an improved furniture frame with a foot ring. The furniture frame of the invention is intended to allow in particular a user-friendly height adjustment of the foot ring to a support column of the furniture frame.

This object is achieved by a furniture frame having the features of claim 1. Particularly preferred embodiments and further developments of the invention are specified in the dependent claims.

The furniture frame of the invention comprises a supporting column, which has a longitudinal axis, a foot ring and a fastening device with which the foot ring is adjustably mounted on the support column in the axial direction, on. The fastening device has a first threaded bush, which is arranged coaxially to the support column and rotatably connected to the support column and having an external thread, and a second threaded bush, which is arranged coaxially to the support column and rotatably connected to the base ring and having an internal thread, on. The internal thread of the second threaded bushing engages the external thread of the first threaded bushing, and the second threaded bushing is rotatable about the first threaded bushing by at least one revolution so that the second threaded bushing can be moved relative to the first threaded bushing in the axial direction. In addition, the fastening device has a locking element which is movable between a first operating position and a second operating position, wherein the locking element in the first operating position prevents relative movement between the first threaded bushing and the second threaded bushing and in the second operating position a relative movement between the first threaded bushing and the second threaded bush releases.

By means of the special construction of the fastening device with first and second threaded bushes, the foot ring can be freely positioned, for example by the user of the furniture frame, on the support column and thus optimally adapted to the needs of the user. The height positioning of the foot ring is done even in the case of a length-adjustable support column regardless of the adjustment of the support column itself.

By the intermeshing of a rotatably connected to the support column first threaded bushing and a rotatably connected to the foot ring second threaded bushing of the foot ring can be adjusted by a simple rotational movement about the longitudinal axis of the support column in the axial direction. The furniture frame of the invention thus has a very user-friendly positioning option for the footrest attached to the support column. The second threaded bushing is thereby rotatable about the first threaded bushing by at least one revolution, preferably by several (i.e. two, three, four or more) revolutions. The number of possible circulations depends on the number of adjustable use positions in different height positions and the maximum displacement dimension in the axial direction or determines these sizes. A circulation is to be understood in this context as a complete 360 ° rotation.

Under a foot ring to be understood in this context, a furniture element on which a user of the furniture can park his feet or support. The foot ring can be referred to as an ascent, footrest or footrest, for example. Despite the name foot ring this is not necessarily designed annular and does not necessarily circumferentially around the entire support column around. Thus, the foot ring can optionally extend only over one or more sectors or secants of a ring shape and / or have an arcuate, a single or multiple curved or a substantially rectilinear shape.

With the help of the locking element, the height adjustment of the foot ring on the support column by the user in a simple way - depending on the operating position of the Locking element - blocked or released. The locking element thus contributes to the user-friendliness of the furniture frame of the invention.

The furniture frame preferably has exactly one support column. The support column is preferably arranged and mounted substantially centrally on a furniture foot. The rotatability of the foot ring relative to the supporting column is achieved in the inventive furniture frame by the first and second threaded bushing, so that the support column can basically have any cross-sectional shape, it is preferably configured in cross-section substantially circular, square or rectangular. The support column may be substantially solid or at least partially hollow. The support column is preferably made of a metallic material or a high-strength plastic material.

The support column of the furniture frame can have a fixed length or be designed adjustable in length. A length-adjustable support column preferably has a gas spring with a cylinder and a piston rod. In the case of the length-adjustable support column, the foot ring is preferably adjustably mounted in the axial direction in the region of the fixed part of the supporting column (for example cylinder of the gas spring).

The longitudinal axis of the support column preferably extends substantially vertically (relative to a substantially horizontal bottom surface on which the furniture frame stands). The axial direction in this context denotes a direction substantially co-linear or parallel to the longitudinal axis of the support column, and the radial direction in this context denotes a direction substantially perpendicular to the longitudinal axis of the support column.

The threaded bushes preferably each have a substantially tubular basic shape. They are arranged coaxially to the support column, ie their longitudinal axes coincide with the longitudinal axis of the support column. In this case, the first threaded bushing preferably has a substantially (circular) outer circumference and the second threaded bushing preferably has a substantially (circular) inner circumference. The first threaded bush has an external thread on its outer side, and the inside of the first threaded bush is with the Outside of the support column rotatably connected. The second threaded bushing has an internal thread on its inside, and the outside of the second threaded bushing is preferably non-rotatably connected to the inside of a hub of the foot ring. The hub is preferably formed integrally with the foot ring or rotatably connected thereto. The second threaded bushing is preferably arranged substantially coaxially with the first threaded bushing. The second threaded bushing preferably encloses the first threaded bush substantially in its entirety. The (first and / or second) threaded bushing is preferably formed in one or more parts, and this in the circumferential direction and / or in the axial direction .. The first threaded bushing extends in the axial direction preferably over a large part of the length of the support column or the fixed part the length-adjustable support column. The second threaded bushing is preferably designed to be shorter in the axial direction than the first threaded bushing. The threaded bushes are preferably made of a plastic material.

The external thread of the first threaded bushing and / or the internal thread of the second threaded bushing are preferably designed as a trapezoidal thread, particularly preferably as a double-threaded trapezoidal thread. With this embodiment, the advantage can preferably be achieved that the forces are derived on a mechanical load of the foot ring (especially in a one-sided or asymmetrical load) on the thread of the threaded bushes on the (stably trained) support column.

A non-rotatable connection or arrangement between two components designates a construction in which the two components can not be non-destructively rotated relative to each other. The rotationally fixed arrangement is preferably designed as a positive, non-positive and / or material connection between the components. Such a connection is preferably by a deviating from the circular cross-sectional profile of at least one of the two components (eg by knurling or welded sheets), by gluing or welding of the two components, by a press fit between the two components, by shrinking the one component to the other Component (eg during cooling after a molding process of a component), by a one-piece design of the two components with each other, achieved by combinations of these measures or the like.

The locking element is a device which is suitable and arranged to be moved back and forth between a first operating position and a second operating position, preferably several times. The locking element is in contact or in engagement with the first threaded bushing and with the second threaded bushing, at least in each case one of the two operating positions. The locking element is preferably configured in one or more parts. The locking element is preferably made of metal or plastic.

The furniture frame is particularly suitable for seating and table furniture, particularly preferred for chairs, swivel chairs and bar tables. The furniture frame preferably has a furniture foot for supporting the support column. The furniture foot is basically any stand device for the furniture frame or the furniture as a whole, it can be either designed as a mobile furniture foot (for example, with castors) or as a stationary furniture foot.

In a preferred embodiment of the invention, the locking element is biased in its first operating position. With this configuration, it can be preferably prevented that the foot ring is unintentionally adjusted in its height position, for example when the foot ring is loaded. To achieve the bias, the locking element is preferably operatively connected to a spring element.

In a preferred embodiment of the invention, the fastening device further comprises an actuating element, which is operatively connected to the locking element in order to move the locking element between its first and second operating position can. The actuator is preferably arranged freely accessible and operated by the user of the furniture frame. Preferably, the actuating element is guided or held on / in the foot ring or guided or held in a holding element fastened to the foot ring. If the locking element to be biased in its first operating position, the actuating element for this purpose preferably a spring element.

In a further preferred embodiment of the invention, the locking element is held against rotation relative to the second threaded bush and movable relative to the first threaded bushing in the radial direction.

In a preferred embodiment of the invention, the first threaded bushing has a first longitudinal groove and has the locking element on a clamping block or is formed in the manner of a clamping block, which engages in the first operating position of the locking element in the first longitudinal groove of the first threaded bushing. The engaging in the first longitudinal groove of the first threaded bushing clamping block may preferably a rotational movement of the second threaded bushing (and thus of the furniture element), in which the locking element is preferably held rotationally fixed to block the first threaded bushing (and thus to the supporting column).

In a preferred embodiment of the invention, the locking element has a mandrel, which engages in the second operating position of the locking element in the external thread of the first threaded bushing.

In a further preferred embodiment of the invention, the first threaded bushing has a first longitudinal groove, in which a plurality of recesses spaced in the axial direction are formed, and the locking element comprises a clamping block (or is designed in the manner of a clamping block), which in the first operating position of the locking element engages in the first longitudinal groove of the first threaded bush, and a mandrel, which engages in the first operating position of the locking element in one of the recesses in the first longitudinal groove of the first threaded bushing and engages in the second operating position of the locking element in the external thread of the first threaded bushing, on ,

With the aforementioned preferred embodiments, at least one of the advantages can be achieved that the locking element during the relative rotational movement between the first and second threaded bushing in a desired position relative to the two threaded bushing remains, and that the Fußring in the first operating position of the locking element in safer the adjusted height position remains.

The first longitudinal groove is formed on the outside of the first threaded bushing and extends substantially parallel to the longitudinal axis of the support column. The first longitudinal groove preferably intersects the spirally encircling thread groove of the external thread of the first threaded bushing several times.

The first longitudinal groove is preferably spaced from a furniture foot facing one end of the first threaded bushing and / or a remote from a furniture foot end of the first threaded bushing. With these spacings, stops for the movement of the second threaded bushing relative to the first threaded bushing in the axial direction upwards or downwards can be created in a simple manner.

The clamping block of the locking element preferably has, in the circumferential direction of the first threaded bushing, a width which is dimensioned slightly less than the width of the first longitudinal slot. The most accurate fitting of the clamping block in the longitudinal groove - possibly together with an engagement of the mandrel in a recess in the longitudinal groove - can cause as free of play holding the foot ring on the support column at the desired height position.

In the axial direction of the clamping block of the locking element is preferably sized larger than a width of the thread groove of the external thread of the first threaded bushing. Particularly preferably, the clamping block of the locking element in the axial direction is at least as large as a pitch of the external thread of the first threaded bushing dimensioned.

The recesses in the first longitudinal groove of the first threaded bushing are preferably each arranged in the course of the thread groove of the external thread of the first threaded bushing. Preferably, the recesses are provided in the first longitudinal groove at each passage of the thread groove or only every other or every third passage of the thread groove through the first longitudinal groove.

In a further preferred embodiment of the invention, a securing device is on the first threaded bushing and / or the second threaded bushing provided which prevents movement of the second threaded bushing beyond an end of the first threaded bush facing away from the furniture foot. This securing effect should in particular also be present for the locking element in its second operating position. The securing device preferably has a securing ring, which is inserted into an annular groove at the upper end of the support column.

In yet another preferred embodiment of the invention, the first threaded bushing has at least one second longitudinal groove, with which the locking element can not be brought into engagement. About this at least one second longitudinal groove can be a material abrasion of the threaded bushes and the locking element (which is formed by the relative movements of the engaged components) automatically removed from the furniture frame out. In one embodiment, the mandrel of the locking member promotes in its second operating position the material abrasion along the thread groove of the external thread of the first threaded bush to the at least one second longitudinal groove of the first threaded bushing, through which it can then fall. In the case of exactly one second longitudinal groove, this is preferably arranged substantially diametrically opposite the first longitudinal groove.

The invention further relates to a chair furniture, which has a seat and a chair frame of the invention described above, wherein the support column of the chair frame carries the seat, either directly or through a seat support therebetween. All mentioned above in connection with the furniture frame advantages, definitions and preferred developments apply in a corresponding manner for this chair furniture.

The invention also relates to a table furniture, which has a table top and a table frame of the invention described above, wherein the support column of the table frame carries the table top, either directly or via a table top mount in between. All mentioned above in connection with the furniture frame advantages, definitions and preferred developments apply in a corresponding manner for this table furniture. Finally, the subject of the invention is a foot ring for a furniture frame of the invention described above.

Fig. 1

eine Perspektivansicht eines Stuhlgestells gemäß einem Ausführungs-beispiel der Erfindung;

Fig. 2

eine Seitenansicht des Stuhlgestells von Fig. 1 ohne Fußkreuz;

Fig. 3

eine Perspektivansicht des Stuhlgestells von Fig. 1 ohne Fußkreuz, mit dem Fußring in einer anderen Höhenposition als in Fig. 1;

Fig. 4

eine Längsschnittansicht des Stuhlgestells von Fig. 1;

Fig. 5A

eine Unteransicht des Fußrings von Fig. 1, mit einem aufgesetzten Deckel für das Feststellsystem;

Fig. 5B

eine Querschnittsansicht des Stuhlgestells von Fig. 1 in einer höhenverstellbaren Stellung;

Fig. 5C

eine Querschnittsansicht des Stuhlgestells von Fig. 1 in einer höhenfixierten Stellung;

Fig. 5D

eine Detailansicht von Fig. 5C zur Veranschaulichung des Feststellsystems;

Fig. 6A

eine Teillängsschnittansicht des Stuhlgestells von Fig. 1 in der höhenfixierten Stellung von Fig. 5C und D;

Fig. 6B

eine Teillängsschnittansicht des Stuhlgestells von Fig. 1 in der höhenverstellbaren Stellung von Fig. 5B;

Fig. 6C

eine Teillängsschnittansicht desStuhlgestells zur Veranschaulichung der drehfesten Verbindung zwischen dem Fußring und der zweiten Gewindebuchse; und

Fig. 7

eine perspektivische Explosionsdarstellung des Stuhlgestells von Fig. 1 ohne Fußkreuz.

The above and other features and advantages of the invention will become more apparent from the following description of a preferred, non-limiting embodiment thereof with reference to the accompanying drawings. In it show, in part schematically:

Fig. 1

a perspective view of a chair frame according to an embodiment of the invention;

Fig. 2

a side view of the chair frame of Fig. 1 without a base;

Fig. 3

a perspective view of the chair frame of Fig. 1 without a base, with the foot ring in a different height position than in Fig. 1 ;

Fig. 4

a longitudinal sectional view of the chair frame of Fig. 1 ;

Fig. 5A

a bottom view of the foot ring of Fig. 1 , with an attached lid for the locking system;

Fig. 5B

a cross-sectional view of the chair frame of Fig. 1 in a height adjustable position;

Fig. 5C

a cross-sectional view of the chair frame of Fig. 1 in a height-fixed position;

Fig. 5D

a detailed view of Fig. 5C to illustrate the locking system;

Fig. 6A

a partial longitudinal sectional view of the chair frame of Fig. 1 in the height-fixed position of Fig. 5C and D;

Fig. 6B

a partial longitudinal sectional view of the chair frame of Fig. 1 in the height-adjustable position of Fig. 5B ;

Fig. 6C

a partial longitudinal sectional view of the chair frame to illustrate the rotationally fixed connection between the foot ring and the second threaded bushing; and

Fig. 7

an exploded perspective view of the chair frame of Fig. 1 without a base.

Based on Fig. 1 to 7 The invention will now be explained in more detail with reference to a furniture frame in the form of a chair frame for a swivel chair with a foot ring. However, the invention is also applicable to other chair and table furniture.

The chair frame 10 has a furniture foot in the form of a base 12 with several castors 14 and mounted on the base 12 gas spring as height-adjustable support column 16. On this support column 16 by means of a seat support (not shown), for example, a seat with backrest are rotatably mounted.

The support column 16 has a substantially vertically extending longitudinal axis 17 and is mounted substantially centrally on the base 12. The support column 16 forming gas spring has a fixed cylinder and a coaxial with this recorded therein piston rod. The piston rod is hydropneumatically adjustable in the axial direction relative to the cylinder, so as to change the length of the support column 16 and thus the height of the seat.

At the bottom, ie the base 12 facing the end of the cylinder of the gas spring, a first cone 18 is provided, which is received in a corresponding recess in the base 12. The first cone 18 is preferably used with a press fit in the base 12 and optionally additionally glued. In an alternative embodiment, the cylinder of the gas spring or a support column of fixed length can be height-adjustable mounted in the base 12.

At the top, i. the base 12 remote from the end of the piston rod of the gas spring, a second cone 20 is provided. This second cone 20 is used together with a threaded pin 21 or the like at the upper end of the piston rod of the gas spring of the assembly of the seat support for the seat.

On the support pillar 16, specifically on its fixed part (e.g., cylinder of the gas spring), a foot ring 24 having a plurality of struts 26 is attached by means of a fastener. The fastening device is designed such that the foot ring 24 is mounted vertically adjustable in the region of the fixed part of the support column 16. The height adjustment of the foot ring 24 is done regardless of a height adjustment of the seat on the length adjustment of the support column 16. The user can optimally adapt the swivel chair to his / her needs, whereby the comfort of the user is increased.

The fastening device has a first threaded bush 22 made of plastic with an external thread 28. The external thread is preferably configured as a double-threaded trapezoidal thread. The first threaded bush 22 is pushed, for example, after its molding process in the still warm state on the support column 16 and then shrinks during cooling on the outer periphery of the support column 16 so that it is rotatably connected with this. An additional fixation can be achieved, for example, by knurling the support column 16 and / or welded-on metal sheets to prevent rotation and / or by an adhesive bond.

The first threaded bush 22 also has a first longitudinal groove 30 in its outer side, which extends substantially vertically and crosses the thread groove of the external thread 28 several times. In this case, the first longitudinal groove 30 is spaced from the lower and the upper end of the first threaded bush 22, so that a first stop 30a and a second stop 30b are formed.

In addition, a plurality of depressions 31 are preferably formed in the first longitudinal groove 30. These recesses 31 are arranged one behind the other in the axial direction at a distance from one another. The recesses 31 are each in the course of

(imaginary) thread groove of the external thread 28 positioned by the first longitudinal groove 30, in the embodiment shown only at each second intersection.

As in Fig. 5C shown, the first threaded bush 22 also has a second longitudinal groove 32 in its outer side. This second longitudinal groove 32 is arranged substantially diametrically opposite the first longitudinal groove 30. In addition, the second longitudinal groove 32 is dimensioned narrower in the circumferential direction of the first threaded bush 22 than the first longitudinal groove 30th

The fastening device for mounting the foot ring 24 also has a second threaded bush 34 made of plastic. This is rotatably received in a central hub 25 of the foot ring 24 to this. For example, at least one radially outwardly projecting locking lug 35 is provided on the lateral surface of the second threaded bushing 34, which can engage or snap into a corresponding recess 27 in the foot ring 24 or the hub 25 of the foot ring 24, as in Fig. 6C is illustrated.

The second threaded bushing 34 is thus arranged coaxially with the first threaded bushing 22 and the support column 16 and surrounds the first threaded bush 22 in full. However, the second threaded bushing 34 is significantly shorter in the axial direction than the first threaded bushing 22. As in Fig. 7 For example, the second threaded bushing 34 may be assembled from two half-shells to facilitate the assembly of the chair frame 10 and its attachment means for the foot ring 24, respectively.

Alternatively, it is also conceivable to form the internal thread 36 directly on the hub 25 of the foot ring 24, i. to design the second threaded bushing 34 in one piece with the foot ring 24.

On its inner side, the second threaded bush 34 has an internal thread 36 which engages with the external thread 28 of the first threaded bushing 28. In this way, the second threaded bush 34 can be rotated about the longitudinal axis 17 of the support column 16 relative to the first threaded bush 22. During this rotational movement, the second threaded bush 34 (and thus also the foot ring 24) in the axial direction relative to the first threaded bush 22 (and thus also to the support column 16).

In order to fix the foot ring 24 in a desired height position and to prevent unintentional adjustment of the foot ring 24, the fastening device also has a locking element 38 (cf. Fig. 5 to 7 ).

The locking element 38 is made of high-strength plastic or metal and is formed substantially in the manner of a clamping block (alternatively: has a guide pin and a clamping block) and has a mandrel 38 a (see. Fig. 5D . 6A and 6B ). In the embodiment shown, the locking element 38 is integrally formed. The mandrel 38 a of the locking element 38 is dimensioned so that it can engage both in the thread groove of the external thread 28 of the first threaded bushing 22 and in the recesses 31 in the first longitudinal groove 30 of the first threaded bush 22. The clamping stone-like locking element 38 is dimensioned in the circumferential direction of the first threaded bush 22 such that it (with as little play) can engage in the first longitudinal groove 30 of the first threaded bushing 22, but not in the second longitudinal groove 32 of the first threaded bushing 22. To the intervention To facilitate, the clamping block may be slightly conical. In the axial direction, the clamping-stone-like locking element 38 extends over at least one pitch of the external thread 28 of the first threaded bushing 22 away.

The locking element 38 is received in a recess 40 of the second threaded bushing 34 so that it is in the radial direction between a first operating position ( Fig. 5C . 5D and 6A ) and a second operating position ( Fig. 5B and 6B ) can be moved. In the axial direction and in the circumferential direction, however, the locking element 38 is positioned stationary with respect to the second threaded bush 34.

In the first operating position of the locking element 38 engages its clamping block shape in the first longitudinal groove 30 of the first threaded bushing 22 and engages the mandrel 38 a in one of the recesses 31 in the first longitudinal groove 30 of the first threaded bushing 22, so that a relative movement between the first threaded bushing 22 and the second threaded bushing 34 is blocked. In the second operating position of the locking element 38, the locking element 38 is pulled outward in the radial direction, so that it rests externally on the external thread 28 of the first threaded bush 22 and its mandrel 38 a engages only in the thread groove of the external thread 28 of the first threaded bushing 22, so that a relative rotation between the first threaded bush 22 and the second threaded bush 34 is made possible.

The movement of the locking element 38 between the two operating positions can be adjusted by the user by means of a corresponding actuating element 42 (cf. Fig. 5D ), which is operatively connected to the locking element 38 via a lever 41 which is pivotable about a parallel to the longitudinal axis 17 of the support column 16 oriented axis of rotation 41 a. In order to bias the locking element 38 into its first operating position, the actuating element 42 is coupled to a spring element 43. In addition, the actuator 42 is taken together with the lever 41 and the spring element 43 in the foot ring 24 (alternatively: in a molded or fixed to the foot ring holding member 44) and protected by a removable cover 44.

When assembling the chair frame 10, first the first threaded bushing 22 is shrunk onto the supporting column 16 and then the second threaded bush 34 is assembled around the first threaded bushing 22 on the supporting column 16 (cf. Fig. 7 ) and then inserted into the hub 25 of the foot ring 24 and locked (see. Fig. 6C ). Thereafter, the locking element 38, the actuator 42 with the spring element 43 and the lever 41 are inserted into the base ring 24 and the cavity of the foot ring 24 receiving these elements closed with a cover 44 (see. Fig. 5A and 7 ).

Alternatively, first the second threaded bushing 34 can be inserted into the hub 25 of the foot ring 24 (possibly pressed un / or glued), then the locking element 38 inserted from the inside into the recess 40 of the second threaded bushing 34 and pushed outwards where it Finally, via the lever 41 can be connected to the actuator 42 before the foot ring 24 is closed with the cover 44. Only then is the first threaded bush 22 shrunk onto the support column 16. The support column 16 can then be screwed with the first threaded bushing 22 in the second threaded bushing 34. Finally, the support column 16 is set with the first cone 18 in the base 12.

The operation of the chair frame 10 constructed as described above is as follows.

At rest, the foot ring 24 is in any height position on the support column 16 of the pedestal 10 and the locking element 38 of the fastening device is biased in its second operating position. In this state, the foot ring 24 can be moved either in the axial direction, which is prevented by the interlocking threads 28, 36 of the two threaded bushings 22, 34 are still rotated about the support column 16, which by the first in the first longitudinal groove 30 of the first Threaded sleeve 22 engaging locking element 38 is prevented. The fixation of the foot ring 24 in this state is reinforced by the engaging in one of the recesses 31 in the first longitudinal groove 30 mandrel 38 a of the locking element 38.

If a user wants to change the height position of the foot ring 24, for example, to adapt to his / her height, so he presses the actuator 42 in the foot ring 24 to the locking element 38 via the lever 41 against the biasing force of the spring element 43 radially outward to move to his second operating position. In this case, the locking element 38 is also pulled out of the first longitudinal groove 30 of the first threaded bush 22.

The second threaded bushing 34 can then be rotated relative to the first threaded bushing 22, wherein the mandrel 38a of the locking element 38 engages in the thread groove of the external thread 28 of the first threaded bush 22 (guide aid). After a short rotation of the foot ring 24 (and thus the second threaded bushing 34 to the first threaded bush 22), the user can basically release the actuator 42 again, the clamping block of the locking element 38 then sets on the external thread 28 of the first threaded bushing 22, since he with the second threaded bushing 34 is rotated away from the first longitudinal groove 30 in the first threaded bush 22.

The rotation of the foot ring 24 about the support column 16 can be continued until it reaches 360 °. Then, the locking element 38 engages due to the bias by the spring element 43 again in the first longitudinal groove 30 of the first threaded bushing 22 a. In addition, the mandrel 38a of the locking element 38 engages in the recess 31 above or below (depending on the direction of rotation) of the recess of the previous height positioning. Of course, this process can be repeated more often to achieve a greater height adjustment of the foot ring 24.

A complete rotation of the foot ring 24 by 360 ° (which corresponds to one revolution) causes, for example, a stroke of about 2 to 3 cm.

With such rotation of the foot ring 24 about the supporting column 16, the mandrel 38a of the locking member 38 transports simultaneously abrasion material in the thread groove of the external thread 28 of the first threaded bushing 22 to the second longitudinal groove 32 of the first threaded bushing 22. In the second longitudinal groove 32, the material can then fall down and trickle down out of the chair frame 10. This measure counteracts excessive wear of the fastening device with its movable components.

REFERENCE NUMBER LIST

10

Furniture frame, chair frame

12

Furniture foot, foot cross

14

casters

16

support column

17

longitudinal axis

18

first cone

20

second cone

21

Set screw

22

first threaded bush

24

anklet

25

hub

26

Strut, spoke

27

recess

28

External thread of 22

30

first longitudinal groove of 22

30a

first stop of 30

30b

second stop of 30

31

Depressions in 30

32

second longitudinal groove of 22

34

second threaded bush

35

Latch on 34

36

Internal thread of 34

38

Locking element, latch

38a

mandrel

40

Recess in 34

41

lever

41a

Rotation axis of 41

42

actuator

43

spring element

44

cover

Claims (13)

Furniture frame (10), in particular chair or table frame, comprising: a support column (16) having a longitudinal axis (17); a foot ring (24); and a fastening device, with which the foot ring (24) on the support column (16) is adjustably mounted in the axial direction and which comprises: a first threaded bush (22), which is arranged coaxially to the support column (16) and is non-rotatably connected to the support column (16) and has an external thread (28); a second threaded bushing (34), which is arranged coaxially to the support column (16) and non-rotatably connected to the foot ring (24) and an internal thread (36), wherein the internal thread (36) of the second threaded bush (34) with the external thread ( 28) of the first threaded bushing (22) is engaged and the second threaded bushing (34) is rotatable about the first threaded bushing (22) by at least one revolution, so that the second threaded bushing (34) moves in the axial direction relative to the first threaded bushing (22) can be; and a locking element (38) which is movable between a first operating position and a second operating position, wherein it prevents a relative movement between the first threaded bushing (22) and the second threaded bushing (34) in the first operating position and in the second operating position a relative movement between the first threaded bushing (22) and the second threaded bushing (34) releases. Furniture frame according to claim 1,
characterized in that
the locking element (38) is biased in its first operating position. Furniture frame according to claim 1 or 2,
characterized in that
the fastening device further comprises an actuating element (42), which is operatively connected to the locking element (38) in order to move the locking element (38) between its first and second operating position. Furniture frame according to one of the preceding claims,
characterized in that
the locking element (38) is held non-rotatably relative to the second threaded bush (34) and is movable relative to the first threaded bush (22) in the radial direction. Furniture frame according to one of the preceding claims,
characterized in that
the first threaded bush (22) has a first longitudinal groove (30); and the locking element (38) has a clamping block, which engages in the first operating position of the locking element (38) in the first longitudinal groove (30) of the first threaded bush (22). Furniture frame according to one of the preceding claims,
characterized in that
the locking element (38) has a mandrel (38a) which engages in the second operating position of the locking element (38) in the external thread (28) of the first threaded bush (22). Furniture frame according to one of the preceding claims,
characterized in that
the first threaded bushing (22) has a first longitudinal groove (30) in which a plurality of recesses (31) spaced apart in the axial direction are formed; and
the locking element (38) a clamping block, which in the first operating position of the locking element (38) in the first longitudinal groove (30) of the first Threaded bushing (22) engages, and a mandrel (38 a) which engages in the first operating position of the locking element (38) in one of the recesses (31) in the first longitudinal groove (30) of the first threaded bushing (22) and in the second operating position of Locking element (38) engages in the external thread (28) of the first threaded bush (22). Furniture frame according to one of claims 5 to 7,
characterized in that
the first longitudinal groove (30) is spaced apart from an end of the first threaded bush (22) facing the furniture foot (12) (30a) and / or is spaced from an end of the first threaded bush (22) facing away from the furniture foot (12) (30b). Furniture frame according to one of the preceding claims,
characterized in that
the external thread (28) of the first threaded bush (22) is designed as a trapezoidal thread. Furniture frame according to one of the preceding claims,
characterized in that
the first threaded bush (22) has at least one second longitudinal groove (32) with which the locking element (38) can not be brought into engagement. Furniture frame according to one of the preceding claims,
characterized in that
the support column (16) is adjustable in length. Chair or table furniture, comprising a seat or a table top and a furniture frame (10) according to any one of claims 1 to 11, wherein the support column (16) of the furniture frame (10) carries the seat or the table top. Foot ring (24) for a furniture frame (10) according to one of claims 1 to 11.

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