EP0963717A2 - Höhenverstellbares untergestell - Google Patents

Höhenverstellbares untergestell Download PDF

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Publication number
EP0963717A2
EP0963717A2 EP99610033A EP99610033A EP0963717A2 EP 0963717 A2 EP0963717 A2 EP 0963717A2 EP 99610033 A EP99610033 A EP 99610033A EP 99610033 A EP99610033 A EP 99610033A EP 0963717 A2 EP0963717 A2 EP 0963717A2
Authority
EP
European Patent Office
Prior art keywords
cord
toothed
underframe
cross
secured
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.)
Withdrawn
Application number
EP99610033A
Other languages
English (en)
French (fr)
Other versions
EP0963717A3 (de
Inventor
Ulf Raabo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0963717A2 publication Critical patent/EP0963717A2/de
Publication of EP0963717A3 publication Critical patent/EP0963717A3/de
Withdrawn legal-status Critical Current

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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
    • A47B9/12—Tables with tops of variable height with flexible height-adjusting means, e.g. rope, chain
    • 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
    • A47B2200/0051—Telescopic
    • A47B2200/0054—Telescopic with three telescopic parts

Definitions

  • the present invention concerns a height-adjustable underframe for a table or a similar work plafform, said underframe comprising a cross-beam with at least two telescopically adjustable legs, a mechanically-driven movement arrangement to which cords are connected and run over cord pulleys in the underframe and in the legs, and which are arranged to work between a lower leg part and at least one upper leg part.
  • Height-adjustable underframes of this kind have been developed for places of work where height-adjustment of a table top or work plafform is expedient in order to achieve an ergonomically correct and individually adjusted working height in the working situation.
  • the expression platform shall also be taken in the broad sense, and in addition to actual table tops can thus include frames which are configured to support items which are to be worked with and/or assembled.
  • the displacement in height can be effected either manually or mechanically.
  • the adjustment time is often of considerable length, the reason being that the operator is not occupied during the process. Therefore, with a mechanical adjustment of the height, it is desirable that the time taken for the height adjustment is minimal, for example approx. 5 sec's.
  • a mechanical displacement of the height can be effected in several ways.
  • the displacement can be effected by means of screw spindles which by means of a motor are rotated inside nuts which are connected to the plafform, so that the plafform is hereby raised or lowered.
  • this construction is slow, in that normally there can only be achieved a displacement of the plafform of approx. 1.5 to 3 cm during the course of 1 second.
  • there is great friction between the nuts and the screw spindles so that great motor power is required and great wear takes place on the parts with subsequent frequent replacement, and a considerable emission of noise due to high speeds of rotation.
  • the mechanically-driven movement arrangement comprises a toothed wheel which on diametrically-opposing sides is in engagement with parallel toothed racks, so that rotation of the toothed wheel displaces the toothed racks in opposite directions.
  • a first cord extends from the one end of the one toothed rack, further over a first cord pulley at the top of the one leg, and continues down in the leg around a second cord pulley, then upwards again over a third cord pulley and ends at the corresponding end on the second toothed rack.
  • a corresponding cord extends in a similar manner from the opposite ends of the toothed racks and through the other leg.
  • Both legs comprise a lower leg part, an upper leg part and an intermediate leg between the upper and the lower leg parts.
  • the second cord pulley is arranged in a rotative manner lowermost in the intermediate leg, and each cord is additionally fastened to a driving pin in the upper leg part.
  • a third and a fourth cord are provided in each of the two legs, all of which cords extend around a number of cord pulleys and are secured to fixture pins in the legs.
  • the construction is to a significant degree made considerably more expensive by the number of cords and cord pulleys, and the motor for the driving of the movement arrangement must be very powerful in order to raise and lower the plafform within a reasonable period of time. It is also difficult to tighten the many cords, so that these do not slide away from the cord pulleys when the underframe is raised, after which the underframe must be separated again in order to place the cords correctly in the cord pulleys.
  • the mechanically-driven movement arrangement comprises a toothed wheel in engagement with a toothed element, and a compression spring element co-operates with the toothed element for its displacement in the longitudinal direction of the cross-beam for adjustment of the height of the leg, in that a first and a second cord are secured to an end on the toothed element.
  • the movement arrangement according to the invention can be provided with a drawing-down arrangement. It is hereby achieved that the relative movement between the upper leg parts and the lower leg parts will always be controlled in relation to each other, and that there will always be an active traction in both directions.
  • the height-adjustable underframe 1 comprises at least two telescopically adjustable legs 2a,2b, which are built up of an outer part in the form of a lower leg part 3 and at least one inner part in the form of an upper leg part 5.
  • the lower leg part 3 and the upper leg part 5, and the possible centremost leg part 4 consist of rectangular tubes in which the leg parts 3,4,5 are engaged with one another in a sliding manner.
  • the lower leg part 3 has a foot part 6 which can be of any configuration.
  • the upper leg part 5 has a support profile 7 for a table top or the like, and it will be understood that the support profile 7 can be of any configuration and can therefore be adapted to suit various purposes.
  • a cross-beam 10 extends between the upper leg parts 5 and is configured as a box which forms a housing for the movement arrangement 20, cords and cord pulleys.
  • the movement arrangement 20 comprises a reversible motor 21 which has a protruding axle with a worm 22 which is in engagement with a worm wheel 23, the axle 24 of which extends transversely to the longitudinal direction of the cross-beam 10 and is mounted in a rotational manner in suitable bearings.
  • a toothed wheel 25 is mounted in a fixed manner, so that the toothed wheel 25 is rotated together with the worm wheel 23.
  • the toothed wheel 25 is in engagement with a toothed element, such as a toothed belt or preferably a chain 26, which extends as a U-shaped first loop more or less over half the circumference of the toothed wheel 25, in that the one end 27 of the chain 26 is secured at a fixed point 28 inside the cross-beam 10, and the other end 29 of the chain 26 is secured to the ends of a first and a second cord 40 and 41 respectively.
  • a compression spring element 30 with a toothed roller 31 which is in engagement with the chain 26 in such a manner that the chain 26 also extends as a U-shaped second loop between the toothed wheel 25 and the point 28, where the opening in the U-shape faces towards the toothed wheel 25.
  • the chain 26 thus extends snakelike in a Z- or S-shape.
  • the opposite second end of the compression spring element 30 is secured in a pivotal manner at fixture point 32 in the cross-beam 10.
  • the two cords 40, 41 extend under a first rotational cord pulley 42.
  • the first cord 40 continues over and partly around a second cord pulley 43a which is arranged in a rotational manner at the top of the leg 2a, which is to the right in fig. 2.
  • the first cord 40 continues downwards in the leg 2a on the inside of the upper leg part 5a, around a third rotational cord pulley 44a lowermost in the upper leg part 5a, then extends further upwards between the upper leg part 5a and the lower leg part 3a and is finally secured to a fixture point 45a uppermost on the inside the lower leg part 3a.
  • the second cord 41 extends halfway around the first cord pulley 42 so that it changes direction towards the second leg 2b, which is to the left in fig. 2, where the second cord 41 extends in a corresponding manner around rotational cord pulleys 43b and 44b and ends at a fixture point 45b uppermost inside the lower leg part 3b.
  • Figs. 4 and 5 show the system for the drawing-down of the upper leg parts 5 and the cross-beam 10 which is used in connection with the embodiment shown in figs. 2 and 3. For the sake of clarity, some of the components shown in figs. 2 and 3 have been omitted from figs. 4 and 5. There is thus seen the lower leg parts 3 and the upper leg parts 5 with the cross-beam 10 which extends between the upper leg parts. Mounted on the cross-beam 10 there is a reversible motor 21 with associated worm drive on which the toothed wheel 25 is mounted, which drives the toothed element 26, which in the example shown can be a chain or a toothed belt.
  • the one end 27 of the chain is secured inside the cross-beam 10 at the fixture point 28, in that the chain 26 extends around the sprocket 31 which is mounted on the end of the compression spring element 30.
  • the other end of the chain is secured to the ends of the first and the second cord 40 and 41 respectively.
  • fig. 4 shows only the first part of these cords, the further extent of which will be as shown in figs. 2 and 3.
  • a third cord 46 and a fourth cord 47 are secured to the chain 26 at a point 48, which lies between the toothed wheel 25 and the sprocket 31.
  • the third cord 46 extends down under a fourth rotational cord pulley 49 and from here up over the first cord pulley 42, as described in connection with figs. 2 and 3.
  • the third cord 46 extends over and partly around a fifth rotational cord pulley 50a which is placed at the side of the second cord pulley 43a uppermost in the leg 2a, which is to the right in figs. 4 and 5.
  • the third cord 46 continues downwards inside the leg 2a to the lowermost end of the lower leg part 3a, where it is secured at fixture point 51a.
  • the fourth cord 47 extends halfway around the fourth cord pulley 49 so that it changes direction towards the second leg 2b, which is to the left in figs. 4 and 5, where it extends in a corresponding manner around a rotational cord pulley 50b which is placed at the side of the second cord pulley 43b, and ends at a fixture point 51b in the lowermost end of the lower leg part 3b.
  • the relative movement between the upper leg parts 5 and the lower leg parts 3 will thus always be controlled by the cords 40, 41 and 46, 47.
  • the movement arrangement is used without the drawing-down arrangement described above, it can happen, for example, when the cross-beam 10, the support profiles 7 or the platform mounted hereon are raised, that the lower leg parts 3 will remain on the ground, and there is thus a risk that the cords 40, 41 can come out of engagement with the various cord pulleys.
  • the cords 40, 41 in the upper leg parts 5 extend over cord pulleys 43 and 44 and end at fixture points 45.
  • figs. 6 and 7, which show only the right leg 2a there is an additional cord 60a which, from a fixture point 61a inside the lowermost part of the upper leg part 5a, extends around a cord pulley 62a which is placed in a rotational manner in the centremost leg part 4a, and is finally secured at a fixture point 63a uppermost inside the lower leg part 3a.
  • An additional cord 60b extends in a corresponding manner in the left leg 2b.
  • the drawing-down arrangement is not shown in figs. 6 and 7, but can be used in connection with legs consisting of upper, lower and centremost leg parts in the same way as described in connection with figs. 4 and 5, in that the third and fourth cord 46, 47 respectively from the fifth cord pulley 50 at the top of the upper leg part 5 will extend down through this, the centremost leg part 4 and down to the lowermost end of the lower leg part 3, where the cord is secured at fixture point 51.
  • FIG. 8 A second embodiment of the movement arrangement according to the invention is shown in fig. 8.
  • the movement arrangement 20 comprises a reversible motor 21 which has a protruding axle with a worm 22 which is in engagement with a worm wheel 23, the axle 24 of which extends transversely to the longitudinal direction of the cross-beam 10 and is housed in a rotational manner in suitable bearings.
  • a toothed wheel 25 is mounted in a fixed manner on the axle 24, so that the toothed wheel 25 rotates together with the worm wheel 23.
  • the toothed wheel 25 is in engagement with a toothed rack 26 which is housed in a displaceable manner in the longitudinal direction of the cross-beam in a way which is not shown in the drawing.
  • the toothed element thus consists of the toothed rack 26, and a rotation of the toothed wheel 25 will displace the toothed rack 26 forwards and backwards in the cross-beam 10.
  • a compression spring element 30 is secured in a pivotal manner at a fixture point 32 inside the cross-beam 10, and the other end of the element is similarly secured in a pivotal manner to the end 29 of the toothed rack 26, to which cords 40, 41 are also secured.
  • the drawing-down arrangement described in connection with figs. 4 and 5 can also be used in connection with the second embodiment of the movement arrangement 20.
  • This merely requires that the fourth cord pulley 49 is placed to the left of the toothed wheel 25 and the toothed rack 26 in fig. 8, in that the third and the fourth cord 46, 47 must be secured to that end of the toothed rack 26 which lies opposite the end 29.
  • the third cord 46 must extend halfway around the fourth cord pulley 49 before it continues over to the fifth cord pulley 50a, over this and down in the upper leg part 5a.
  • the fourth cord must extend down under the fourth cord pulley 49 and up over the fifth cord pulley 50b, and hereafter down in the upper leg part 5b. This is not illustrated in fig. 8.
  • a third embodiment of the movement arrangement according to the invention is shown in figs. 9 and 10.
  • the movement arrangement 20 comprises a reversible motor 21 which has a protruding axle with a worm 22 which is in engagement with a worm wheel 23, the axle 24 for which extends transversely to the longitudinal direction of the cross-beam 10 and is housed in a rotational manner in suitable bearings.
  • Two parallel toothed wheels 25 are mounted on the axle 24 in a fixed manner, so that the toothed wheels 25 rotate together with the worm wheel 23.
  • the one toothed wheel 25 is in engagement with a toothed rack 26 which is housed in a displaceable manner (not shown) in the longitudinal direction of the cross-beam 10.
  • the one toothed wheel will therefore displace the toothed rack 26 forwards and backwards inside the cross-beam 10.
  • Cords 40, 41 are secured to the end 29 of the toothed rack 26.
  • the second of the two toothed wheels 25 is in engagement with a further toothed element in the form of an endless toothed belt or chain 80 which extends to and continuously around a further toothed wheel 81 at a distance from the axle 24.
  • a further toothed element in the form of an endless toothed belt or chain 80 which extends to and continuously around a further toothed wheel 81 at a distance from the axle 24.
  • a conical cord pulley 82 mounted in a fixed manner on the axle for the further toothed wheel 81 there is a conical cord pulley 82, which thus rotates when the motor 21 is activated for rotation in one or the other direction.
  • a compression spring element 30 is secured in a pivotal manner to the inside of the cross-beam 10 at a fixture point 32, and the other end of the compression spring element 30 has a cord pulley 31.
  • a cord 83 extends in a U-shaped loop around the cord pulley 31 on the end of the compression spring element 30, runs for some turns around the conical cord pulley 81 and is secured hereto by its other end 85.
  • the advantage with this embodiment is that the influence of the compression spring element 30 on the lifting force of the underframe 1 is compensated for by means of the conical cord pulley 82 shown in connection with the chain drive, so that the resulting influence can be held constant.
  • the drawing-down arrangement described in connection with figs. 4 and 5 can also be used in connection with the third embodiment of the movement arrangement 20.
  • the drawing-down arrangement must thus be modified in the same way as described in connection with the second embodiment of the movement arrangement shown in fig. 8, in that the fourth cord pulley 49 must be placed to the left of the toothed wheel 25 and the toothed rack 26 in fig. 9, and in that the third and fourth cord 46, 47 must be secured to that end of the toothed rack 26 which lies opposite the end 29.
  • the third cord 46 must extend halfway around the fourth cord pulley 49 before it continues over to the fifth cord pulley 50a, over this and down in the upper leg part 5a.
  • the fourth cord must extend down under the fourth cord pulley 49 and up over the fifth cord pulley 50b, and hereafter down in the upper leg part 5b. This is not illustrated in fig. 9.
  • the underframe must be equipped with at least one extra set of legs, as shown in fig. 11.
  • the extra legs 2c, 2d are provided on an additional cross-beam 10' parallel with the cross-beam 10 shown in figs. 2 and 3, and the two cross-beams 10, 10' are connected by longitudinal beams 90, 90' which consist of rectangular tubes. In such a case, all four legs 2a, 2b, 2c and 2d must naturally be adjusted in height simultaneously.
  • a fifth cord 70 is secured to the end 29 of the toothed element, the toothed belt, the toothed rack or the chain 26, as shown in figs. 2 and 8.
  • This fifth cord 70 also extends halfway around the first cord pulley 42, and thereafter extends more or less parallel with the second cord 41.
  • a sixth rotational cord pulley 71 is mounted at a suitable place in the cross-beam 10, the axle for this pulley extending more or less parallel with the legs 2.
  • the fifth cord 70 extends a quarter of the way around the sixth cord pulley 71, and thereafter continues further at right-angles to the plane of the drawing through the one longitudinal beam 90 or 90' to the other cross-beam 10'.
  • the second cross-beam 10' is of the same construction as the cross-beam 10, but needs only to be provided with cord pulleys 71, 42, 43 and 44 and cords 40 and 41.
  • the electric motor discussed in the above can, for example, be an electric motor for the driving of windscreen wipers on a car, said motor 21 being made reversible by pole reversal.
  • the motor can be designed for 24V operation, but with the normally brief operation times can be supplied with over-voltage. This over-voltage, which among other things for reasons of security must not exceed 50V, can e.g. lie in the range from 28V to 50V.
  • the compression spring element 30 serves as a weight-balancing device during the height adjustment of the underframe 1, and contributes in a positive manner to the raising of the platform, in that by its placing in all of the shown embodiments, the compression spring element 30 draws the toothed element, the toothed belt or the chain 26 in the desired direction around the toothed wheel 25.
  • the compression spring element 30 preferably consists of a gas-pressure spring, but can also be a helical spring, which applies for the shown embodiments of the invention.
  • the spring element can also be a tension spring.
  • pins are provided which extend out to the side for the activation of switches in the cross-beam 10. These switches are used partly to disconnect the supply from the electric motor 21, and partly to effect a polarity reversal of the motor in relation to the state of the poles before the disconnection, so that upon a renewed supply of power the motor 21 will rotate in the opposite direction.
  • cords described in the above consist, for example, of steel wire, carbon fibres, chains or similar materials.

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  • Transmission Devices (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
EP99610033A 1998-05-29 1999-05-26 Höhenverstellbares untergestell Withdrawn EP0963717A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK72098 1998-05-29
DK72098A DK72098A (da) 1998-05-29 1998-05-29 Højdeindstilbart understel

Publications (2)

Publication Number Publication Date
EP0963717A2 true EP0963717A2 (de) 1999-12-15
EP0963717A3 EP0963717A3 (de) 2002-09-18

Family

ID=8096769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99610033A Withdrawn EP0963717A3 (de) 1998-05-29 1999-05-26 Höhenverstellbares untergestell

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EP (1) EP0963717A3 (de)
DK (1) DK72098A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1224890A1 (de) 2001-01-22 2002-07-24 Instituttet For Produktudvikling Stuhl oder Hocker, wie Musik- oder Klavierhocker
KR101651153B1 (ko) * 2015-04-22 2016-08-26 주식회사 디자인칼라스 스마트 높이조절 데스크
US9510670B2 (en) 2014-05-08 2016-12-06 Teknion Limited Height-adjustable table
US9572422B2 (en) 2014-08-11 2017-02-21 Ergotron, Inc. Height adjustable desk system and method
CN110052004A (zh) * 2019-05-27 2019-07-26 菏泽学院 移动式同步自增高韧带拉伸装置
CN113425080A (zh) * 2021-08-18 2021-09-24 浙江昇禾节能环保设备有限公司 一种高承载电动升降桌
WO2022199238A1 (zh) * 2021-03-24 2022-09-29 苏州润迈德医疗科技有限公司 一种冠状动脉分析系统及操作方法
WO2023159493A1 (zh) * 2022-02-25 2023-08-31 宁波沱沱河设计有限公司 支撑架、显示器装置及升降桌
EP3973817B1 (de) * 2020-09-23 2024-04-24 Kesseböhmer Holding KG Stützvorrichtung für ein höhenverstellbares tischgestell

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502504C2 (sv) 1990-10-24 1995-10-30 Skellefteaa En Innovations Tek Höj- och sänkbart underrede, speciellt avsett till bord, bänkar och liknande anordningar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425680A1 (de) * 1994-07-20 1996-01-25 Klaus Peter Dipl Ing Flamme Anordnung eines Parallelantriebes zum Bewegen von Sitz- oder Liegemöbel und Tischen mittels entgegengesetzt angetriebener und umgelenkter Ketten oder Seile

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502504C2 (sv) 1990-10-24 1995-10-30 Skellefteaa En Innovations Tek Höj- och sänkbart underrede, speciellt avsett till bord, bänkar och liknande anordningar

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1224890A1 (de) 2001-01-22 2002-07-24 Instituttet For Produktudvikling Stuhl oder Hocker, wie Musik- oder Klavierhocker
US9510670B2 (en) 2014-05-08 2016-12-06 Teknion Limited Height-adjustable table
US9820565B2 (en) 2014-05-08 2017-11-21 Teknion Limited Height adjustable table
US9572422B2 (en) 2014-08-11 2017-02-21 Ergotron, Inc. Height adjustable desk system and method
KR101651153B1 (ko) * 2015-04-22 2016-08-26 주식회사 디자인칼라스 스마트 높이조절 데스크
CN110052004A (zh) * 2019-05-27 2019-07-26 菏泽学院 移动式同步自增高韧带拉伸装置
EP3973817B1 (de) * 2020-09-23 2024-04-24 Kesseböhmer Holding KG Stützvorrichtung für ein höhenverstellbares tischgestell
WO2022199238A1 (zh) * 2021-03-24 2022-09-29 苏州润迈德医疗科技有限公司 一种冠状动脉分析系统及操作方法
CN113425080A (zh) * 2021-08-18 2021-09-24 浙江昇禾节能环保设备有限公司 一种高承载电动升降桌
WO2023159493A1 (zh) * 2022-02-25 2023-08-31 宁波沱沱河设计有限公司 支撑架、显示器装置及升降桌

Also Published As

Publication number Publication date
EP0963717A3 (de) 2002-09-18
DK72098A (da) 1999-11-30

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