EP0882415B1 - Legs adjustable in height for supporting a table top, desk top or work top. - Google Patents
Legs adjustable in height for supporting a table top, desk top or work top. Download PDFInfo
- Publication number
- EP0882415B1 EP0882415B1 EP98201827A EP98201827A EP0882415B1 EP 0882415 B1 EP0882415 B1 EP 0882415B1 EP 98201827 A EP98201827 A EP 98201827A EP 98201827 A EP98201827 A EP 98201827A EP 0882415 B1 EP0882415 B1 EP 0882415B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- legs
- leg
- rotations
- screw shaft
- height
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B9/00—Tables with tops of variable height
- A47B9/04—Tables with tops of variable height with vertical spindle
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B2200/00—General construction of tables or desks
- A47B2200/0035—Tables or desks with features relating to adjustability or folding
- A47B2200/005—Leg adjustment
- A47B2200/0056—Leg adjustment with a motor, e.g. an electric motor
- A47B2200/0058—Leg adjustment with a motor, e.g. an electric motor with synchronized motors
Definitions
- the invention relates to legs adjustable in height for supporting table tops, desk tops or work tops being supported by at least two of such legs, each leg being provided with an assembly of screw shaft and nut, said shaft extending substantially in longitudinal direction of said leg, the screw shaft and nut being coupled to portions of the legs slidable relative to each other, or to a portion of said leg and the top supported by it, in such a way that on rotating the screw shaft, the leg portions can be moved relative to each other and where each leg comprises a hollow column incorporating an electric motor extending substantially in longitudinal direction, said electric motor driving the screw shaft in longitudinal direction within the column by means of a transmission, see EP-A-0 685 185.
- Such desk and work tops are applied on an increasingly large scale since it is desirable that a person working at a desk or the like assumes a proper sitting position. A wrong position may cause physical complaints. Furthermore, in modern offices a desk is used by various persons, so that a desk can not be adjusted to one specific person.
- the top is supported by at least two legs, it is desirable that there is a coupling between the adjusting mechanisms of both legs. Then it can be provided for that the top remains in its horizontale position while adjusting it. Usually this is realized by mechanical transmissions through rotary shafts. However, such a coupling takes up a certain amount of space. This can be disturbing for e.g. legroom and cabinet space and therefore the well-known supporting structures do not have an attractive appearance and defects may arise when the height adjustment of the legs does not take place synchronously. This may occur e.g. by the fact that one leg experiences a greater load than the other, since the supported top locally holds more apparatus.
- the object of the invention is to remove these difficulties and to that end provides for that the motors of the legs being electronically coupled and electronic means being present for counting the number of rotations each of the screw shafts performs per unit of time and for mutually comparing the numbers of rotations of the screw shafts, the electronic means providing for relative adjustment of the speeds of the motors, in such a way that the number of rotations performed by each of the screw shafts per unit of time is substantially equal.
- This electronic coupling also achieves that the legs can be arranged at any desired position, which offers a large degree of freedom in the configuration to be realized.
- the number of rotations per unit of time of the screw shafts in the leg or legs is kept equal to the number of rotations of the screw shaft performing the smallest number of rotations.
- the height of the top in a certain moment can be indicated on a display.
- the user can adjust the top directly to the desired height.
- the leg 1 illustrated in the drawing consists of a horizontally positioned transverse beam 2 being provided with supports 3 by which it can bear on the ground.
- the beam 2 is connected to a baseplate 6 mounted in the lower end of a hollow column 5 by means of bolts 4.
- a column 7 is telescopically slidable in the column 5.
- the column 7 is connected to an uppermost transverse beam 8 on which a table top 9 can be mounted, which is also supported by a corresponding leg 1 not illustrated. Possibly, parts of the legs can be connected for obtaining a greater stiffness of the whole.
- a pipe 10 being provided with a nut 11 at its upper end is mounted on the baseplate 6.
- a screw shaft 12 extends through the nut 11 and can be driven, through a reduction gear unit 13, by an electric motor 14 fixedly mounted in the column 7.
Landscapes
- Tables And Desks Characterized By Structural Shape (AREA)
Description
- The invention relates to legs adjustable in height for supporting table tops, desk tops or work tops being supported by at least two of such legs, each leg being provided with an assembly of screw shaft and nut, said shaft extending substantially in longitudinal direction of said leg, the screw shaft and nut being coupled to portions of the legs slidable relative to each other, or to a portion of said leg and the top supported by it, in such a way that on rotating the screw shaft, the leg portions can be moved relative to each other and where each leg comprises a hollow column incorporating an electric motor extending substantially in longitudinal direction, said electric motor driving the screw shaft in longitudinal direction within the column by means of a transmission, see EP-A-0 685 185.
- Such desk and work tops are applied on an increasingly large scale since it is desirable that a person working at a desk or the like assumes a proper sitting position. A wrong position may cause physical complaints. Furthermore, in modern offices a desk is used by various persons, so that a desk can not be adjusted to one specific person.
- If with the well-known constructions, the top is supported by at least two legs, it is desirable that there is a coupling between the adjusting mechanisms of both legs. Then it can be provided for that the top remains in its horizontale position while adjusting it. Mostly this is realized by mechanical transmissions through rotary shafts. However, such a coupling takes up a certain amount of space. This can be disturbing for e.g. legroom and cabinet space and therefore the well-known supporting structures do not have an attractive appearance and defects may arise when the height adjustment of the legs does not take place synchronously. This may occur e.g. by the fact that one leg experiences a greater load than the other, since the supported top locally holds more apparatus.
- The object of the invention is to remove these difficulties and to that end provides for that the motors of the legs being electronically coupled and electronic means being present for counting the number of rotations each of the screw shafts performs per unit of time and for mutually comparing the numbers of rotations of the screw shafts, the electronic means providing for relative adjustment of the speeds of the motors, in such a way that the number of rotations performed by each of the screw shafts per unit of time is substantially equal.
- This electronic coupling also achieves that the legs can be arranged at any desired position, which offers a large degree of freedom in the configuration to be realized.
- It has turned out that motors of relatively small dimensions suffice, so that, together with the screw shafts, they can be accomodated in legs of small dimensions.
- In particular it is provided for, that the number of rotations per unit of time of the screw shafts in the leg or legs is kept equal to the number of rotations of the screw shaft performing the smallest number of rotations.
- With the help of the electronic means the height of the top in a certain moment can be indicated on a display. When the desk or the like is used by various persons, the user can adjust the top directly to the desired height.
- The invention is further explained by way of an embodiment, shown in the drawing, in which:
- Fig. 1 shows a view of a leg according to the present invention;
- Fig. 2 shows a horizontal section, on an enlarged scale, along the line II-II of Fig. 1; and
- Fig. 3 shows a vertical section, on an enlarged scale, across a portion of said leg, situated within the line III of Fig. 1.
-
- The
leg 1 illustrated in the drawing consists of a horizontally positionedtransverse beam 2 being provided withsupports 3 by which it can bear on the ground. Thebeam 2 is connected to abaseplate 6 mounted in the lower end of ahollow column 5 by means of bolts 4. Acolumn 7 is telescopically slidable in thecolumn 5. By means of bolts 4 and abaseplate 6 thecolumn 7 is connected to an uppermost transverse beam 8 on which a table top 9 can be mounted, which is also supported by acorresponding leg 1 not illustrated. Possibly, parts of the legs can be connected for obtaining a greater stiffness of the whole. - Within the
column 5, apipe 10 being provided with anut 11 at its upper end is mounted on thebaseplate 6. Ascrew shaft 12 extends through thenut 11 and can be driven, through areduction gear unit 13, by anelectric motor 14 fixedly mounted in thecolumn 7. - In the Figs. 1 and 3, the
screw shaft 12 and thus the table top 9, is in its uppermost position. When the current to themotor 14 is switched on, thescrew shaft 12 will be rotated and will start moving downwards, owing to the presence of thenut 11, together with thecolumn 7 and the top 9. At the same time, the current to themotor 14 of theother leg 1 is switched on as well, so that bothcolumns 7, on which the top 9 bears, start moving downwards. - Within the
column 7 there are electronic means for recording the number of rotations performed by ascrew shaft 12. The signal provided by said means is supplied to further electronic means not indicated, intended for driving themotor 14 in theother column 7 at such a speed that thescrew shaft 12 rotated by it performs the same number of rotations as the screw shaft in the first-mentioned column. - It will be obvious, that only one possible embodiment of a leg according to the invention has been illustrated in the drawings and described above and that many changes can be made without leaving the invention, as it is defined in the accompanying claims.
Claims (3)
- Legs (1) adjustable in height for supporting a table top, desk top or work top (9) being supported by at least two of such legs, each leg (1) being provided with an assembly of screw shaft (12) and nut (11), said shaft extending substantially in longitudinal direction of said leg (1), the screw shaft (12) and nut (11) being coupled to portions (5, 7) of the legs (1) which are slidable relative to each other, or to a portion of said leg (1) and the top (9) supported by it, in such a way that on rotating the screw shaft (12), the leg portions can be moved relative to each other, and where each leg (1) comprises a hollow column (5, 7) incorporating an electric motor (14) extending substantially in longitudinal direction, said electric motor driving the screw shaft (12) in longitudinal direction within the column (5, 7) by means of a transmission, characterized in that the motors (14) of the legs (1) being electronically coupled and electronic means being present for counting the number of rotations performed by each of the screw shafts (12) per unit of time and for mutually comparing the numbers of rotations of the screw shafts (12), the electronic means providing for relative adjustment of the speeds of the motors (14), in such a way that the number of rotations performed by each of the screw shafts (12) per unit of time is substantially equal.
- Legs according to claim 1, characterized in that the number of rotations per unit of time of the screw shaft (12) in the leg or legs (1) is kept equal to the number of rotations of the screw shaft (12) performing the smallest number of rotations.
- Legs according to claim 1 or 2, characterized in that with the help of the electronic means the height of the top (9) in a certain moment is indicated on a display.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1006222 | 1997-06-04 | ||
NL1006222A NL1006222C2 (en) | 1997-06-04 | 1997-06-04 | Height-adjustable legs serve to support a table, desk or worktop. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0882415A1 EP0882415A1 (en) | 1998-12-09 |
EP0882415B1 true EP0882415B1 (en) | 2002-09-04 |
Family
ID=19765093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98201827A Expired - Lifetime EP0882415B1 (en) | 1997-06-04 | 1998-06-02 | Legs adjustable in height for supporting a table top, desk top or work top. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0882415B1 (en) |
DE (1) | DE69807581T2 (en) |
NL (1) | NL1006222C2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202004017946U1 (en) * | 2004-11-18 | 2006-03-23 | Dewert Antriebs- Und Systemtechnik Gmbh & Co. Kg | Furniture |
CN100566630C (en) * | 2005-03-19 | 2009-12-09 | 韩国拓步股份有限公司 | The height-adjustable device that is used for table leg |
DE202006007006U1 (en) * | 2006-04-24 | 2006-07-06 | Kesseböhmer Produktions GmbH & Co. KG | Telescopic leg for table, chair, or bench, comprising base with extended upper area covering connection zone between base and leg |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2846223C2 (en) * | 1978-10-24 | 1982-08-26 | Veyhl-Produktion KG, 7266 Neuweiler | Work table |
WO1989010077A1 (en) * | 1988-04-18 | 1989-11-02 | Kearney Deborah S | Adaptive work station |
US5224429A (en) * | 1991-04-17 | 1993-07-06 | Haworth, Inc. | Height adjustable table |
DE4417337A1 (en) * | 1994-05-18 | 1995-11-23 | Stoll Kg Christof | Table with movable top |
DE29701611U1 (en) * | 1997-01-31 | 1997-04-03 | Berbuer, Jürgen, Dr., 52074 Aachen | Drive for adjusting components of a piece of furniture |
-
1997
- 1997-06-04 NL NL1006222A patent/NL1006222C2/en not_active IP Right Cessation
-
1998
- 1998-06-02 DE DE69807581T patent/DE69807581T2/en not_active Expired - Lifetime
- 1998-06-02 EP EP98201827A patent/EP0882415B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69807581D1 (en) | 2002-10-10 |
DE69807581T2 (en) | 2003-05-22 |
EP0882415A1 (en) | 1998-12-09 |
NL1006222C2 (en) | 1998-12-07 |
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