EP1541056B1 - Height-adjustable table, in particular office table - Google Patents

Abstract

A tabletop (1) with recesses (12) for the insertion of cables can be joined to the upper surface of the hollow rectangular frame (4) by inserting screws from below through the frame (4) into holding elements. Two pairs (2) of legs (22) each assembled of two lower parts joined to a transversal element (20) are located at both sides of the frame (4) movable joined to two round bars (30) vertically moving in sleeves (3) provided in the center of the transversal element (20). The sleeves (30) are locked to the bars (30) with a clamping element at the required height.

Description

Field of application of the invention

The invention relates to a table with a height-adjustable table top and one arranged on the lateral outer areas of the table foot from which spread apart two legs. Between each of the two feet and the table top extends at least one guide column, which is mounted vertically adjustable in each foot. A foot further comprises a connecting part, to which connect the two legs, and in which engages the guide column. The height adjustment takes place in different equipment variants manually or by electric motor.

State of the art

Height-adjustable tables are sufficiently available on the market. The design patent US D448 948 S shows a height-adjustable table with two on the lateral outer areas parallel to each other arranged feet. The feet each consist of two legs, which extend obliquely upward from one another on a footprint and thus form a gantry-like arrangement. From one of the legs, an indirectly connected to the table top rod is extendable, which can be locked by means of a lever in the selected extension height.

In the company brochure "DESKDRIVE - The compact solution for height adjustable worksurfaces" of the OKIN, D-51645 Gummersbach / Germany, as well as in the brochure "Telesmart TMA / TMD" Magnetic electric motors AG, CH-4410 Liestal / Switzerland, also in the company brochure Yoyo - Brief instructions Electric height adjustment "of Steelcase Werndl AG, D-83026 Rosenheim / Germany, in the DE 200 08 105 U1 and finally in the US 2003/0033963 A1 , height-adjustable tables are disclosed which have lateral feet, in which vertical telescopically extendable lifting columns are arranged for height adjustment of the table top.

Object of the invention

In relation to the hitherto existing height-adjustable tables, the invention has the object, with reduced material and Konstruktionsauf wall to propose a height-adjustable table with solid stability and generous space in the area of the feet. The table should be easy to assemble and allow a practical and aesthetically appealing solution in handling.

Another object is to be able to change the position of the table legs in relation to the outside of the table in order to minimize or minimize the attachment of accessories such as accessories. Rollcontainers, sideboards or CPU holders.

Another object is to provide the table with structures, e.g. to set up devices or to store utensils to complete.

Overview of the invention

The essence of the inventive height-adjustable table results from the claim 1, while preferred embodiment details are defined in the dependent claims 2 to 8.

Brief description of the attached drawings

Figur 1A -

einen erfindungsgemässen Tisch nahe der niedrigsten Höheneinstellung, in perspektivischer Seitenansicht;

Figur 1B -

den Tisch gemäss Figur 1A, in seitlicher Perspektivansicht unter die Tischplatte;

Figur 1C -

den Tisch gemäss Figur 1A, in perspektivischer Ansicht von unten;

Figur 2A -

den Tisch gemäss Figur 1A, nahe der maximalen Höheneinstellung, ohne Tischplatte, in perspektivischer Seitenansicht;

Figur 2B -

den Aufbau gemäss Figur 2A, nahe der niedrigsten Höheneinstellung, in perspektivischer Ansicht von unten;

Figur 2C -

den Aufbau gemäss Figur 2A, nahe der niedrigsten Höheneinstellung, in perspektivischer Seitenansicht;

Figur 3A -

ein Paar Längsholme, in Perspektivansicht;

Figur 3B -

die Längsholme gemäss Figur 3A in ein Brückenteil eingefügt, nahe der maximalen Aussenposition, in perspektivischer Ansicht von unten;

Figur 3C -

den Aufbau gemäss Figur 3B, ergänzt mit einem Fuss und einer Führungsbaugruppe, in perspektivischer Seitenansicht;

Figur 3D -

den Aufbau gemäss Figur 3C, ergänzt mit einer elektrischen Antriebs- und Steuereinheit sowie einer Verbindungswelle, in gewechselter perspektivischer Seitenansicht;

Figur 3E -

ein Hakenelement aus Figur 1B, in vergrösserter perspektivischer Draufsicht;

Figur 3F -

das Hakenelement gemäss Figur 3E, in perspektivischer Ansicht von unten;

Figur 4A -

ein Brückenteil aus Figur 3B, in perspektivischer Draufsicht;

Figur 4B -

das Brückenteil gemäss Figur 4A, in perspektivischer Ansicht von unten;

Figur 5A -

einen Querholm eines Fusses aus Figur 1A, in perspektivischer Draufsicht;

Figur 5B -

den Querholm gemäss Figur 5A mit eingesetzten Lagerbuchsen und Spindelmutter, in perspektivischer Draufsicht;

Figur 5C -

den Aufbau gemäss Figur 5B, in perspektivischer Ansicht von unten;

Figur 5D -

den Querholm im Aufbau gemäss Figur 5B, ergänzt mit Beinen zu einem kompletten Fuss, in Perspektivansicht;

Figur 5E -

einen Fuss im Aufbau gemäss Figur 5D, ergänzt mit einer Führungsbaugruppe und einer Hubbaugruppe, in Perspektivansicht;

Figur - 6A

xeine Kombination aus Führungs- und Hubbaugruppe, in frontseitiger Perspektivansicht;

Figur 6B -

den Aufbau gemäss Figur 6A, in rückseitiger Perspektivansicht;

Figur 6C -

eine aus zwei Halbschalen zusammengesetzte Lagerbuchse aus der Führungsbaugruppe gemäss Figur 6A, in Perspektivansicht;

Figur 6D -

die beiden Halbschalen der Lagerbuchse gemäss Figur 6C voneinander getrennt, in Perspektivansicht;

Figur 6E -

die beiden Halbschalen der Lagerbuchse gemäss Figur 6C voneinander getrennt und aufgeklappt, in Perspektivansicht;

Figur 6F -

die Spindelmutter aus Figur 6A, in Perspektivansicht;

Figur 6G -

die Hälfte einer Führungsbaugruppe aus Figur 6A mit angesetzter Spindelmutter, in rückseitiger Perspektivansicht;

Figur 6H -

eine nahezu komplette Führungsbaugruppe aus Figur 6A mit eingefügter Spindelmutter, in rückseitiger Perspektivansicht;

Figur 7A -

den Tisch mit Bauteilen gemäss Figur 1A. nahe der niedrigsten Höheneinstellung, ergänzt mit einem Tablar, in perspektivischer Seitenansicht;

Figur 7B -

den Aufbau gemäss Figur 7A, ergänzt mit einem Screen, in perspektivischer Seitenansicht;

Figur 7C -

den Aufbau gemäss Figur 7A, mit herausgezogenem Tablar, in perspektivischer Seitenansicht;

Figur 7D -

eine beispielhafte Kombination mehrerer Tische mit Anbauten, in perspektivischer Seitenansicht;

Figur 8A -

eine unter der Tischplatte an Hakenelementen aufgehängte Box, in perspektivischer Seitenansicht; und

Figur 8B -

die Box mit der Positionierung der Hakenelemente aus Figur 8A, in perspektivischer Seitenansicht.

Show it:

Figure 1A -

a table according to the invention near the lowest height adjustment, in a perspective side view;

FIG. 1B -

according to the table Figure 1A , in side perspective view under the table top;

FIG. 1C

according to the table Figure 1A in perspective view from below;

Figure 2A -

according to the table Figure 1A , near the maximum height adjustment, without table top, in perspective side view;

FIG. 2B -

according to the structure FIG. 2A , near the lowest height setting, in perspective view from below;

FIG. 2C -

according to the structure FIG. 2A , near the lowest height setting, in a perspective side view;

FIG. 3A -

a pair of longitudinal spars, in perspective view;

FIG. 3B -

the longitudinal beams according to FIG. 3A inserted in a bridge part, near the maximum external position, in perspective view from below;

FIG. 3C -

according to the structure FIG. 3B , supplemented with a foot and a guide assembly, in a perspective side view;

Figure 3D -

according to the structure FIG. 3C , supplemented with an electric drive and control unit and a connecting shaft, in exchanged perspective side view;

FIG. 3E -

a hook element FIG. 1B in enlarged perspective plan view;

FIG. 3F -

the hook element according to FIG. 3E in perspective view from below;

FIG. 4A -

a bridge part FIG. 3B in perspective plan view;

FIG. 4B -

the bridge part according to FIG. 4A in perspective view from below;

FIG. 5A

a crossbar of a foot Figure 1A in perspective plan view;

FIG. 5B -

the crossbar according FIG. 5A with inserted bushings and spindle nut, in a perspective plan view;

FIG. 5C -

according to the structure FIG. 5B in perspective view from below;

FIG. 5D -

the cross member in the structure according to FIG. 5B , completed with legs to a complete foot, in perspective view;

FIG. 5E -

a foot in the structure according to FIG. 5D , supplemented with a guide assembly and a lifting assembly, in perspective view;

Figure - 6A

xa combination of guide and lifting unit, in front-sided perspective view;

FIG. 6B -

according to the structure FIG. 6A in back perspective view;

FIG. 6C -

a composite of two half-shells bearing bush from the guide assembly according to FIG. 6A in perspective view;

FIG. 6D -

the two half-shells of the bearing bush according to FIG. 6C separated, in perspective view;

FIG. 6E -

the two half-shells of the bearing bush according to FIG. 6C separated and unfolded, in perspective view;

FIG. 6F -

the spindle nut off FIG. 6A in perspective view;

FIG. 6G -

half of a guide assembly FIG. 6A with attached spindle nut, in rear perspective view;

Figure 6H -

an almost complete guide assembly FIG. 6A with inserted spindle nut, in rear perspective view;

FIG. 7A -

according to the table with components Figure 1A , near the lowest height setting, supplemented with a tray, in a perspective side view;

FIG. 7B -

according to the structure FIG. 7A , supplemented with a screen, in perspective side view;

FIG. 7C -

according to the structure FIG. 7A , with drawn-out tray, in perspective side view;

FIG. 7D -

an exemplary combination of several tables with attachments, in a perspective side view;

FIG. 8A -

a box suspended from hook elements under the table top, in a perspective side view; and

FIG. 8B -

the box with the positioning of the hook elements Figure 8A , in perspective side view.

embodiment

Reference to the accompanying drawings, the detailed description of embodiments of the inventive table with manual or electric motor adjustment follows. Furthermore, the created attachments and structures are described.

The following definition applies to the entire further description. If reference numerals are included in a figure for the purpose of graphic clarity, but are not explained in the directly associated description text, reference is made to their mention in the preceding description of the figures. In the interest of clarity, the repeated designation of components in subsequent figures is usually dispensed with, as far as the drawing clearly shows that they are "recurring" components.

3 Figures 1A to 1C and 3A

The table - ie the top 10 of the table top 1 - is in the height setting h ₁ , which is near the minimum height position h _min . At the maximum height position h _max , the tabletop top 10 would occupy the highest level above the ground. The lateral alignment of both feet 2 is determined by the position P _{2 of} the freely displaceable and fixable bridge parts 5 , wherein the position P _{2 is} close to the maximum external position P _max , while the latter is defined relative to the minimum external position P _min . On the table top 1 recesses 12 are also provided, which mainly serve the passage of holders for table structures.

A foot 2 is composed of the transverse member 20 and the two tubular, straight legs 22 fastened underneath at the outer regions. On the upper side of the transverse spar 20 , a blind hole 200 is provided in each case axially relative to the leg 22 . Centered through each cross member 20 extends a guide assembly 3 with the two guide columns 30, between which the spindle 62 extends, which extends through the arranged in the cross member 20 spindle nut 63 . For the frame 4 two longitudinal beams 40 are needed, which are parallel below the table top 1 , in the two Bridge parts 5 stretched between the latter extend. The longitudinal bars 40 are preferably made of square hollow section. Adjacent to a bridge part 5 could be arranged a drive and control unit 600 for the motorized actuation of the height adjustment. Depending on the length of the table top 1 , a plurality of hook elements 7 are inserted between the table top 11 and the longitudinal members 40 , which prevent bending of the table tops 1 and for other functions - as a cable holder and / or for hanging a box (see Fig. 8A ) - are usable.

FIGS. 2A to 2C

This group of figures aims to further illustrate the table structure, wherein the table top 1 is shown only hinting at the height position. In the height position h ₂ , which is close to the maximum height position h _max , the pairs of guide posts 30 are moved further upwards out of the transverse struts 20 (see FIG Fig. 2A ). The fixedly connected to the respective bridge part 5 , vertically downwardly extending guide columns 30 support the relevant bridge part 5, which in turn carries one end of the two longitudinal beams 40 clamped and here holds the position P ₂ . In the lateral outer region, the bridge part 5 has a recessed transmission bed 57, are housed in the essential elements of the lifting assembly 6 . After partial lowering of both guide assemblies 3, the table reaches the height position h ₁ , which is located near the minimum height position h _min (see Fig. 2B . 2C ).

3 is FIGS. 3B to 4B

The bridge member 5 has on both sides a pair of spaced apart eyelet-shaped enclosures 56 with the respective passage 560. The enclosures 56 and passageways 560 on each side are aligned with each other so that the end of the straight longitudinal spar 40 can be received therein. Adjacent to each enclosure 56 are a first screw hole 51, which projects through the bridge part 5 vertically, and a thereto congruent lying screw seat 510 provided. Second screw holes 52 serve to screw with the table top underside 11 through the bridge part 5 therethrough. In the recessed in the lateral outer region of the bridge part 5 transmission bed 57 opens a pair of third screw holes 53 for attachment of the guide columns 30 and therebetween a spindle passage 550 for the spindle 62. Centered, axially and parallel to the respective alignment lines of the passages 560 passes through the bridge portion 5 a shaft passage 55, which opens towards the opposite bridge part 5 and preferably also exits on the other side of the bridge part 5 . The shaft passage 55 is provided for receiving the connection shaft 601 , which synchronously drives both of the lift assemblies 6 at the table, with the connection shaft 601 being rotated by the drive and control unit 600 . If, in the released state, the bridge part 5 has been brought into contact with the foot 2 connected thereto via the guide assembly 3 and the lifting subassembly 6 along the longitudinal spars 40 - these are in the passages 560 in the enclosures 56 - in the selected external position between P _min and P _max , the assumed position is fixed by tightening the screws 50 , their heads partially under the underside of the longitudinal bars 40 clamped under. The screw holes 51 either have an internal thread complementary to the screws 50 or a nut 500 is located therein .

Figures 3E and 3F

First, the hook element 7, the front round nose 70 and the existing thereon front stop 700 and the center hole 72 and the web 71 with the adjoining rear stop 710 and the gap 75 . Are provided to the central hole 72 lying adjacent outer holes 73 and the both sides of the holes 72,73 arranged bending webs 74 with the stop lugs 740th A first function of the hook elements 7 is inserted between the table top underside 11 and the longitudinal bars 40 , the bending of a larger table top. 1 to prevent. With a larger dimension of the longitudinal bars 40 used , they come to rest between the two stops 700, 710 , whereby the bending webs 74 with the stop lugs 740 are sunk into the hook element 7 and elastically pressed. If smaller longitudinal bars 40 are used in cross-section, they are gripped between the front stop 700 and the projecting stop lugs 740 . The attachment of a table top 1 is carried out at first by the second screw holes 52 in the bridge parts. 5 In a longer table top 1 you can also screw through the longitudinal bars 40 and the center holes 72 in the hook elements 7 .

In the second application, the hook elements 7 can be attached at any position on the underside of the tabletop 11 by screwing, for which purpose the outer holes 73 are used. In both applications, the upward-pointing round lugs 70 for hanging cables or for holding a cable carrier - eg a cable network - can be used. An additional purpose of the hook elements 7 is the hanging of a box 97 (see Fig. 8A ). Through the gap 75, around the web 71 around, can be a holding organ loop - for example, a Velcro -, are held in which cable. In eventual omission of the round nose 70, the stops 700,710, the bending webs 74 and one of two types of holes 72,73 embody the hook elements 7 with the durchschlaufbaren by the gap 75 or a functionally identical eyelet holding member, an applicability to the cable holder not only for the local height-adjustable table, but for tables in general.

FIGS. 5A to 5E

The cross member 20 has the centrally located bearing block 23 ' and the two laterally outgoing boom 21 . At the lower end of each boom 21 has a round, conically tapered outwardly pin 210. Vertically through the end of the boom 21 , a hole 200 extends with a screw 212 into the journal 210 into it. The bearing block 23 ' has two passages 24, between a smaller dimensioned spindle passage 28' and the cavity 27 '. In each passage 24 , a bearing bush 31 is inserted, and the cavity 27 ' serves to receive a spindle nut 63. From the cavity 27' extends to each passage 24, an opening 26. On the inner wall of the passages 24 elevations 25 are present.

The tubular legs 22 can be pushed onto the pins 210 and screwed through the hole 200 , which remains open in a bag-like manner for receiving a bolt 85 (see FIG Fig. 7C ). The cross member 20 , together with the two legs 22 fastened thereto, results in a complete foot 2. In each bearing bush 31 , a cylindrical guide column 30 , which is vertically displaceable therein, is inserted. At the upper end, the guide column 30 has an internally threaded bore 300 for screwing through the third screw holes 53 in the bridge part 5. In the spindle passage 28 ' , the spindle 62 is inserted, which carries at the upper end the gear block 60 with the horizontally provided shaft engagement 61 . Transmission block 60, spindle 62 and spindle nut 63 together form the lifting assembly 6. The two guide columns 30 and the bearing bushes 31 form the guide assembly 3.

FIGS. 6A to 6H

The combination of guide assembly 3 and lifting assembly 6 comprises two adjacently arranged bushings 31 and accommodated therein, vertically displaceable guide columns 30 and positioned between the two bearing bushes 31 , the spindle nut 63, in which the spindle 62 runs with the uppermost present transmission block 60 .

In the bearing bush 31 , the mutually facing half-shells 32 each have a central height, outwardly projecting wedge extension 35, the inclined surface 350 from the upper approach downwardly tends to the outside. Both half-shells 32 can be positively combined to form a bearing bush 31 and are provided with an upper flange 320 and a lower flange 321 , wherein upper and lower flange halves complement each other to an outwardly arched common collar. At the joining edges 32 complementary recesses 33 are present in both half-shells 32 . On the outer shell of the half-shells 32 there are flat elevations 34 in order to stabilize the clamping of the guide assembly 3 in the selected height position between h _max and h _min . In the recesses 33, the elevations 25 of the passages 24 come to rest.

When installed, the two successive wedge extensions 35 leave a downwardly narrowing gap, in which the complementary wedge piece 630 of the spindle nut 63 is seated. The wedge piece 630, through which a vertically extending threaded bore 636 extends from the upper cover surface 631 to the lower bottom surface 632 , further has the back surface 633 and the opposite front surface 634 and the two sloping, downwardly converging side surfaces 635. Continuing from the top surface 631 and bottom surface 632 protrude from the wedge piece 630 depending on a connecting web 637, which support a vertical front plate 638 . When assembled, an inclined surface 350 of the wedge extensions 35 with the adjacent side surface 635 of the spindle nut 63 abut each other. The spindle 62 extends through the threaded hole 636 and the front plate 638, closes access to the cavity 27 ' on the cross member 20 by weight from above the wedge piece 630 is a pressure against the wedge extensions 35 and thus minimizing the play between the bushings 31 and the guide columns 30 therein with the result of improved statics.

FIGS. 7A to 7C

To equip the table with structures can be in the transverse bars 20 upwardly open blind holes 200, which lie below the recesses 12 , insert vertically bolts 85 , which serve the anchorage for a patch, post-shaped bracket 8 , from the example, a tray 90th will be carried. In changing the height position between _hmax and _hmin of the table top 1, the bracket 8 moves surrounding tabletop 1, while the tray 90 remains at the same level. In a variety of tables set up in a room with different selected height position of the table tops 1, the mounted trays 90 are all at the same level, which results in a balancing, ordered arrangement. The blind holes 200 lying on the user side in the feet 2 can be used for attaching attachments - for example a CPU box - or for linking to furniture to be set up next to it. At the plugged bolt 85, to which a holder 8 is possibly docked, can be a fastener 86 holders, which in turn is opposite the user side vertically positioned screen 96 carries, which also does not follow an adjustment of the height of the table top 1 .

Figure 7D

It is understood that the length of the holder 8 is sufficiently dimensioned even at the top height position h _{max of} the table top 1 , without digging the tray 90 . If you combine several tables, you can create varied furnishing pictures. For example, two tables can be set up alongside one another, with the ensemble being supplemented by a third table by linking to an intermediate plate 1 '. The intermediate plate 1 'rests on the mutually aligned feet 2 of two narrow side adjacent tables and bridges the gap. Large-scale lateral recesses 13 'provide space for the projecting through the guide columns 30 and the spindle 62 and the bridge piece 5 and the ends of the longitudinal bars 40 with a minimum height position h _min of the table top 1. The table top 1 of all tables shown three are situated in different height position h ₁ , h ₂ , h _max . In addition, the ensemble could be equipped with a high plate 91 , which provides another level for setting up equipment or for storing utensils. The high plate 91 is supported by four longer, post-shaped brackets 8 , which protrude through the recesses 12 of the two longitudinally juxtaposed tables, put on the transverse ends ending under 20 and, as described above, are fixed by means inserted into the holes 200 bolts 85 .

Figures 8A and 8B

In addition to the function as a spacer or cable holder, the hook elements 7 with their round lugs 70 are also available for releasable suspension of a box 97 below the table top 1 . Such a box 97 is used, for example, to raise a CPU. At the top of the box 97 , two mutually spaced, upstanding support bracket 970 are attached, wherein the distance of the support bracket 970 corresponds to the span of accessible from above round lugs 70 of the fixed between the two longitudinal members 40 and the table top 11 hook elements 7 . When attaching the box 97 is first a mounting bracket 970 mounted in two adjacent round lugs 70 . With slight elastic bending of the second support bracket 970 , the latter can be hooked into the round lugs 70 of the complementary pair of hook elements 7 . It is understood that in the assembled state, the round lugs 70 project laterally on the longitudinal bars 40 and from the round lugs 70 to the table top underside 11 , a passage gap for hanging the support bracket 970, a cable or a cable carrier remains. This results in a multivalent usability of the hook elements 7.

Claims (8)

1. Desk, with:

   a) a desk top (1) adjustable in height between a minimum pull-out height (h_min ) and a maximum pull-out height (h_max);

   b) two feet (2) which are intended to be placed on the floor and which are mounted in the lateral outer regions of the desk and consist in each case of two legs (22);

   c) two guide columns (30) which extend between each of the two feet (2) and the desk top (1) and which are mounted displaceably in height in the respective foot (2);

   d) in each case a connection part (20), to which the two legs (22) of the respective foot (2) are connected and into which the guide columns (30) engage, whereas:

   e) the connection part (20) being a transverse spar bridging the two legs (22);

   f) the transverse spar having a centrally arranged bearing block (23') in which the two guide columns (30) are received; and

   g) a vertical passage (24) being present in the bearing block (23') for each guide column (30), characterised in that

   h) a cavity (27') is arranged between the two passages (24) within a bearing block (23');

   i) a perforation (26) is present between each passage (24) and the cavity (27');

   j) an electromotively or manually actuated lifting subassembly (6) is provided, which consists of:

   ja) a spindle nut (63) which is arranged in the cavity (27') in the bearing block (23') of the connection part (20) of each foot (2) and in which spindle nut (63) a spindle (62) movable upwards and downwards in a limited manner during rotation is guided by means of an external thread; and

   jb) a gear block (60), mounted uppermost on the spindle (62), with a horizontal shaft engagement (61), in which a connecting shaft (601) set in rotation by a drive and control unit (600) is inserted, so that the rotation is transferred to the spindle (62);

   k) a vertical spindle passage (28') for the spindle (62) being provided between the passages (24); and

   l) a gear block (60) being assigned to each foot (2), the connecting shaft (601) preferably driving both gear blocks (60) synchronously.
2. Desk according to Claim 1, characterised in that

   a) the guide columns (30) arranged on both sides of the desk project out of the passages (24) at the bottom, at least in the case of the minimum pull-out height (h_min);

   b) the connection part (20) is fastened horizontally to the upper ends of the two legs (22) of a foot (2);

   c) the two legs (22) and the connection part (20) of each foot (2) span, at least in principle, a vertical plane which lies at least essentially transversely with respect to the longitudinal extent of the desk top (1);

   d) extension pieces (21), to the ends of which the legs (22) are fastened, extend in opposite directions from the bearing block (23') of the connection part (20);

   e) the guide columns (30) are present on both sides of the desk in pairs on a line lying transversely with respect to the longitudinal extent of the desk top (1); and

   f) the guide columns (30) and the passages (24) are cylindrical.
3. Desk according to at least one of Claims 1 and 2, characterised in that

   a) a bearing bush (31) is inserted between the inner wall of each passage (24) and the guide column (30) arranged in it;

   b) the bearing bushes (31) are provided at the top and bottom with a flange (320, 321), which flanges are seated on the outer mouth margins of the passages (24);

   c) on each bearing bush (31) there are clearances (33) in which complementary elevations (25) on the inner wall of the passage (24) come to lie; and

   d) on the outer surface of each bearing bush (31) there are elevations (34) which are in contact solely with the inner wall of the passage (24), whereas an air gap remaining between the other outer surface of each bearing bush (31) and the inner wall of the passage (24).
4. Desk according to Claim 3, characterised in that

   a) each of the two bearing bushes (31) arranged in a connection part (20) possesses on the outside a wedge extension (35) projecting increasingly downwards and having a sloping surface (350);

   b) the two wedge extensions (35) face one another and between them enclose a downwardly narrowing space in which a wedge piece (630) of the spindle nut (63) lies; and

   c) the oblique side surfaces (635) of the wedge piece (630) bear against the sloping surfaces (350) of the wedge extensions (35).
5. Desk according to at least one of Claims 1 to 4, characterised in that the elevations (34) on the outer surface of each bearing bush (31) are in each case offset circularly at 90° in the regions near the flanges (320,321).
6. Desk according to at least one of Claims 1 to 5, characterised in that

   a) a frame (4), consisting of two longitudinal spars (40) spaced apart from one another in parallel and extending parallel to the longitudinal side of the desk top (1), is fastened to the underside of the desk top (1) and extends over a large part of the length of the latter;

   b) in each case a bridge part (5) for fastening the guide columns (30) is mounted in the two lateral outer regions of the desk between the two longitudinal spars (40); and

   c) each of the two bridge parts (5) of a desk can be positioned in a clamping manner, so as to be displaceable in steps or continuously, along the frame (4) between a maximum outer position (P_max) and an innermost outer position (P_min).
7. Desk according to at least one of Claims 1 and 6, characterised in that each bridge part (5) comprises:

   a) a preferably centrically positioned gear bed (57) for the fixed reception of a gear block (60);

   b) a shaft passage (55), extending in the longitudinal axis of the desk, for leading the connecting shaft (601) to the gear block (60);

   c) first screw holes (51) for the positive or non-positive screwing of the bridge part (5) to the longitudinal spars (40);

   d) second screw holes (52) for fastening the desk top (1) to the bridge part (5);

   e) third screw holes (53) in the bottom of the gear bed (57) for fastening the guide columns (30); and

   f) surrounds (56) complementary to the cross section of the longitudinal spars (40) and profiled or closed in lug form, for partially or completely surrounding the longitudinal spars (40).
8. Desk according to at least one of Claims 1 to 7, characterised in that

   a) hook elements (7) are provided, which can be mounted onto the longitudinal spars (40), so as to support the desk top (1) from below, or are intended for fastening to the desk-top underside (11);

   b) each hook element (7) has:

   ba) a round nose (70) for suspending a cable holder, for example as a network, or for suspending the carrying yokes (970) of a box (97);

   bb) a gap (75) for mounting a holding loop for cables; and

   bc) holes (72,73) for the passage of a screw introduced from the underside of the longitudinal spar (40) and engaging into the desk top (1) or for screwing to the desk-top underside (11) outside the longitudinal spars (40).

Images