EP1480538B1 - Work table - Google Patents

Work table Download PDF

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Publication number
EP1480538B1
EP1480538B1 EP03704087A EP03704087A EP1480538B1 EP 1480538 B1 EP1480538 B1 EP 1480538B1 EP 03704087 A EP03704087 A EP 03704087A EP 03704087 A EP03704087 A EP 03704087A EP 1480538 B1 EP1480538 B1 EP 1480538B1
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EP
European Patent Office
Prior art keywords
work table
motor
rotation
control device
obstacle
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
Application number
EP03704087A
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German (de)
French (fr)
Other versions
EP1480538A1 (en
Inventor
Walter Koch
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Individual
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Individual
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Publication date
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Application filed by Individual filed Critical Individual
Priority to AT03704087T priority Critical patent/ATE325558T1/en
Publication of EP1480538A1 publication Critical patent/EP1480538A1/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
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    • 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

Definitions

  • the invention relates to a work table with a particular height-adjustable frame, the adjustment of which at least one electric motor is provided with a control device.
  • the invention is therefore the object of a work table of the type described in such a way that obstacles that reach the trajectory of the work table or drive parts are detected in a simple manner can shut down the table drive before any damage or injury occurs.
  • the invention solves this problem by the fact that the control device connected to an encoder for the engine load reverses the direction of rotation of the electric motor as a function of the determined change in the engine load and shuts it off after a reverse rotation caused thereby.
  • any obstacle entering the path of movement of a work table or one of its driving parts increases the engine load, the occurrence of an obstacle can be detected by appropriate monitoring of the engine load, regardless of the local location of the obstacle.
  • only one encoder for the load of the engine or the motors needs to be arranged and a control device to be acted upon by the determined engine loads to umzupolen the direction of rotation of the drive upon the occurrence of corresponding changes in the engine load and the engine or the motors for a corresponding Reset reset path.
  • the resetting of the drive offers over a mere shutdown of the engines the advantage that the obstacle is released after starting again and therefore can be removed unhindered from the adjustment of the work table.
  • the engine load can be determined in different ways, for example via the effective torque which can be detected via a provided in the course of the engine support pressure sensor. Particularly simple design conditions, however, arise when the encoder for the engine load consists of a measuring device for the motor current, which indeed changes with the engine load.
  • the illustrated embodiment shows a work table with a table top 1, which is supported by a frame 2, the telescopic legs 3 for height adjustment of the table top 1 has.
  • These telescopic legs 3 are adjustable by means of electric motors 4, which drive with a rack 5 meshing gears 6, when the electric motors 4 are controlled via a control device 7.
  • an input unit 8 which can also be wirelessly connected to the control device 7 in conjunction and has a conventional input field 9 for operating the work table.
  • the engine load is detected by encoder 10 and forwarded to the controller 7, so that due to corresponding changes in load, an intervention in the engine control can be made.
  • the arrangement is made such that the electric motors 4 are not only stopped, but also reversed in their direction of rotation to reset the table top 1 to release the obstacle. For this purpose, after the reversal of the direction of rotation of the electric motors 4 whose Shutdown controlled by a timer 11, which specifies a preferably adjustable period of time for the opposite motor operation.
  • the encoders 10 for the engine load are formed in the embodiment as a measuring device 12 for the respective motor current and turned on in the supply lines 13 between the motors 4 and a power source 14, which may be in the form of, for example, a power supply or a battery.
  • a measuring device 12 for the respective motor current is formed in the embodiment as a measuring device 12 for the respective motor current and turned on in the supply lines 13 between the motors 4 and a power source 14, which may be in the form of, for example, a power supply or a battery.

Landscapes

  • Forklifts And Lifting Vehicles (AREA)
  • Liquid Crystal (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Multiple Motors (AREA)
  • Massaging Devices (AREA)
  • Vending Machines For Individual Products (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Testing Of Engines (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Inorganic Insulating Materials (AREA)

Abstract

The work table has a chassis (2) that can be adjusted, especially in height, and at least one electric motor (4) for adjustment purposes with a controller (7) connected to a motor load sensor (10). The controller reverses the direction of rotation of the motor depending on the detected parameter and/or change in motor load and switches the motor off after a resulting reverse rotation.

Description

Die Erfindung bezieht sich auf einen Arbeitstisch mit einem insbesondere der Höhe nach verstellbaren Gestell, zu dessen Verstellung wenigstens ein elektrischer Motor mit einer Steuereinrichtung vorgesehen ist.The invention relates to a work table with a particular height-adjustable frame, the adjustment of which at least one electric motor is provided with a control device.

Stand der TechnikState of the art

Um im Bereich eines Arbeitsplatzes, beispielsweise bei einem Schreibtisch, gute ergonomische Verhältnisse sicherstellen zu können, ist es bekannt, Arbeitstische mit einem insbesondere der Höhe nach verstellbaren Gestell auszustatten. Zur Vereinfachung dieser Höhenverstellung von Arbeitstischen werden elektrische Motoren eingesetzt, die über eine Steuereinrichtung her betätigt werden. Ein solcher Arbeitstisch ist aus EP 1 038 470 A bekannt. Ein elektrischer Antrieb bringt allerdings die Gefahr mit sich, daß beim Auftreten eines Hindernisses im Bereich des Stellweges des Arbeitstisches, eines auf dem Arbeitstisch abgestellten Gegenstandes oder von Antriebsteilen dieses Hindernis nicht erkannt und mit einer aufgrund des elektromotorischen Antriebes zum Teil erheblichen Kraft belastet wird, was eine Gefährdung des Hindernisses, aber auch des Arbeitstisches oder der Gegenstände auf dem Arbeitstisch mit sich bringt. Dies gilt insbesondere dann, wenn Körperteile solche Hindernisse darstellen, weil dann ein vergleichsweise großes Verletzungsrisiko besteht.In order to be able to ensure good ergonomic conditions in the area of a workstation, for example at a desk, it is known to equip working tables with a frame which is adjustable in particular in terms of height. To simplify this height adjustment of work tables electric motors are used, which are actuated by a control device forth. Such a work table is known from EP 1 038 470 A. However, an electric drive brings with it the danger that when an obstacle occurs in the range of the travel of the work table, a parked on the work table object or drive parts of this obstacle is not recognized and charged with a due to the electric motor drive sometimes considerable force, which endangerment of the obstacle, but also of the work table or objects on the work table. This is especially true when body parts are such obstacles, because then there is a relatively high risk of injury.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt somit die Aufgabe zugrunde, einen Arbeitstisch der eingangs geschilderten Art so auszugestalten, daß Hindernisse, die in die Bewegungsbahn des Arbeitstisches oder von Antriebsteilen gelangen, in einfacher Weise erfaßt werden können, um den Tischantrieb abschalten zu können, bevor Schäden oder Verletzungen auftreten.The invention is therefore the object of a work table of the type described in such a way that obstacles that reach the trajectory of the work table or drive parts are detected in a simple manner can shut down the table drive before any damage or injury occurs.

Die Erfindung löst die gestellte Aufgabe dadurch, daß die an einen Geber für die Motorbelastung angeschlossene Steuereinrichtung die Drehrichtung des elektrischen Motors in Abhängigkeit von der ermittelten Änderung der Motorbelastung umpolt und nach einem dadurch bedingten Rückdrehen abschaltet.The invention solves this problem by the fact that the control device connected to an encoder for the engine load reverses the direction of rotation of the electric motor as a function of the determined change in the engine load and shuts it off after a reverse rotation caused thereby.

Da jedes in die Bewegungsbahn eines Arbeitstisches oder eines seiner Antriebsteile gelangende Hindernis die Motorbelastung vergrößert, kann über eine entsprechende Überwachung der Motorbelastung das Auftreten eines Hindernisses erkannt werden, und zwar unabhängig von der jeweiligen örtlichen Lage des Hindernisses. Zu diesem Zweck braucht lediglich ein Geber für die Belastung des Motors bzw. der Motoren angeordnet und eine Steuereinrichtung mit den ermittelten Motorbelastungen beaufschlagt zu werden, um beim Auftreten entsprechender Änderungen der Motorbelastung die Drehrichtung des Antriebes umzupolen und den Motor bzw. die Motoren nach einem entsprechenden Rückstellweg abzustellen. Das Rückstellen des Antriebs bietet gegenüber einem bloßen Abschalten der Motoren den Vorteil, daß das Hindernis nach dem Anfahren wieder freigestellt wird und daher unbehindert aus dem Verstellbereich des Arbeitstisches entfernt werden kann.Since any obstacle entering the path of movement of a work table or one of its driving parts increases the engine load, the occurrence of an obstacle can be detected by appropriate monitoring of the engine load, regardless of the local location of the obstacle. For this purpose, only one encoder for the load of the engine or the motors needs to be arranged and a control device to be acted upon by the determined engine loads to umzupolen the direction of rotation of the drive upon the occurrence of corresponding changes in the engine load and the engine or the motors for a corresponding Reset reset path. The resetting of the drive offers over a mere shutdown of the engines the advantage that the obstacle is released after starting again and therefore can be removed unhindered from the adjustment of the work table.

Die Motorbelastung kann auf unterschiedliche Art ermittelt werden, beispielsweise über das wirksame Drehmoment, das über einen im Zuge der Motorabstützung vorgesehenen Drucksensor erfaßt werden kann. Besonders einfache Konstruktionsverhältnisse ergeben sich allerdings, wenn der Geber für die Motorbelastung aus einer Meßeinrichtung für den Motorstrom besteht, der sich ja mit der Motorbelastung ändert.The engine load can be determined in different ways, for example via the effective torque which can be detected via a provided in the course of the engine support pressure sensor. Particularly simple design conditions, however, arise when the encoder for the engine load consists of a measuring device for the motor current, which indeed changes with the engine load.

Für das zur vorgegebenen Tischverstellung gegensinnige Rückstellen eines Arbeitstisches ergeben sich für die Motoransteuerung einfache Konstruktionsvoraussetzungen, wenn die Steuereinrichtung den elektrischen Motor nach dem Umpolen der Drehrichtung über ein Zeitglied abschaltet, das den Rückstellweg bestimmt. Mit der Einstellbarkeit eines solchen Zeitgliedes kann der Rückstellweg an die jeweiligen Verhältnisse angepaßt werden.For the opposite of the given table adjustment resetting a work table arise for the motor control simple design requirements, when the control device, the electric motor after the polarity reversal the direction of rotation via a timer off, which determines the reset path. With the adjustability of such a timer the reset path can be adapted to the respective conditions.

Kurze Beschreibung der ZeichnungShort description of the drawing

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt, und zwar wird ein erfindungsgemäßer Arbeitstisch in einem schematischen Blockschaltbild gezeigt.In the drawing, the subject invention is illustrated, for example, and that an inventive work table is shown in a schematic block diagram.

Weg zur Ausführung der ErfindungWay to carry out the invention

Das dargestellte Ausführungsbeispiel zeigt einen Arbeitstisch mit einer Tischplatte 1, die von einem Gestell 2 getragen wird, das Teleskopbeine 3 zur Höhenverstellung der Tischplatte 1 aufweist. Diese Teleskopbeine 3 sind mit Hilfe von elektrischen Motoren 4 verstellbar, die mit einer Zahnstange 5 kämmende Zahnräder 6 antreiben, wenn die elektrischen Motoren 4 über eine Steuereinrichtung 7 entsprechen angesteuert werden. Zur Betätigung der geschilderten Stelleinrichtung dient eine Eingabeeinheit 8, die auch drahtlos mit der Steuereinrichtung 7 in Verbindung stehen kann und ein übliches Eingabefeld 9 zum Bedienen des Arbeitstisches aufweist.The illustrated embodiment shows a work table with a table top 1, which is supported by a frame 2, the telescopic legs 3 for height adjustment of the table top 1 has. These telescopic legs 3 are adjustable by means of electric motors 4, which drive with a rack 5 meshing gears 6, when the electric motors 4 are controlled via a control device 7. To actuate the described actuating device is an input unit 8, which can also be wirelessly connected to the control device 7 in conjunction and has a conventional input field 9 for operating the work table.

Um Hindernisse im Bereich des Stellweges für die Tischplatte 1 oder eines auf der Tischplatte 1 abgestellten Gegenstandes erkennen und die Elektromotoren 4 über die Steuereinrichtung 7 so anzusteuern, daß beim Anfahren an das Hindernis weder das Hindernis noch der Arbeitstisch oder ein auf der Tischplatte 1 angeordnetes Gerät Schaden erleidet, wird die Motorbelastung über Geber 10 erfaßt und an die Steuereinrichtung 7 weitergeleitet, so daß aufgrund von entsprechenden Belastungsänderungen ein Eingriff in die Motorsteuerung vorgenommen werden kann. Die Anordnung ist dabei so getroffen, daß die elektrischen Motoren 4 nicht nur angehalten, sondern auch in ihrer Drehrichtung umgepolt werden, um die Tischplatte 1 zur Freistellung des Hindernisses rückzustellen. Zu diesem Zweck wird nach der Umpolung der Drehrichtung der elektrischen Motoren 4 deren Abschaltung über ein Zeitglied 11 gesteuert, das eine vorzugsweise einstellbare Zeitspanne für den gegensinnigen Motorbetrieb vorgibt.To detect obstacles in the range of travel for the table top 1 or parked on the table top 1 object and the electric motors 4 via the controller 7 to control so that when approaching the obstacle neither the obstacle nor the work table or arranged on the table top 1 device Damage suffers, the engine load is detected by encoder 10 and forwarded to the controller 7, so that due to corresponding changes in load, an intervention in the engine control can be made. The arrangement is made such that the electric motors 4 are not only stopped, but also reversed in their direction of rotation to reset the table top 1 to release the obstacle. For this purpose, after the reversal of the direction of rotation of the electric motors 4 whose Shutdown controlled by a timer 11, which specifies a preferably adjustable period of time for the opposite motor operation.

Die Geber 10 für die Motorbelastung sind im Ausführungsbeispiel als Meßeinrichtung 12 für den jeweiligen Motorstrom ausgebildet und in die Versorgungsleitungen 13 zwischen den Motoren 4 und einer Stromquelle 14 eingeschaltet, die in Form beispielsweise eines Netzteiles oder einer Batterie vorliegen kann. Anhand des sich mit der Motorbelastung ändernden Motorstromes ergibt sich somit eine wirksame Überwachung für die unbehinderte Verstellung des Arbeitstisches, so daß beim Auftreten eines Hindernisses die über die Eingabeeinrichtung 8 vorgegebene Verstellung des Arbeitstisches unterbrochen und um ein Maß rückgestellt wird, das die Freigabe des durch den Arbeitstisch oder einen auf dem Tisch abgelegten Gegenstand angefahrenen Hindernisses bedingt.The encoders 10 for the engine load are formed in the embodiment as a measuring device 12 for the respective motor current and turned on in the supply lines 13 between the motors 4 and a power source 14, which may be in the form of, for example, a power supply or a battery. On the basis of changing with the engine load motor current thus results in an effective monitoring for the unobstructed adjustment of the work table so that the occurrence of an obstacle via the input device 8 predetermined adjustment of the work table is interrupted and reset by a measure that the release of the by the Work table or an object deposited on the table.

Claims (3)

  1. A work table with a frame (2) which is adjustable especially with respect to its height and for the adjustment of which at least one electric motor (4) with a control device (7) is provided, characterised in that the control device (7) which is connected to a transducer (10) for the motor load reverses the direction of rotation of the electric motor (4) in dependence upon the determined change in the motor load and cuts off the same after a thus caused reverse rotation.
  2. A work table according to claim 1, characterised in that the transducer (10) for the motor load consists of a measuring device (12) for the motor current.
  3. A work table according to claim 1 or 2,
    characterised in that the control device (7) cuts off the electric motor (4) via a timer member (11) after the reversal of the direction of rotation.
EP03704087A 2002-02-26 2003-02-11 Work table Expired - Lifetime EP1480538B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT03704087T ATE325558T1 (en) 2002-02-26 2003-02-11 WORK TABLE

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0028402A AT410626B (en) 2002-02-26 2002-02-26 Work table has controller that reverses direction of rotation of adjustment motor depending on detected parameter and/or motor load change, switches motor off after resulting reverse rotation
AT2842002 2002-02-26
PCT/AT2003/000039 WO2003071897A1 (en) 2002-02-26 2003-02-11 Work table

Publications (2)

Publication Number Publication Date
EP1480538A1 EP1480538A1 (en) 2004-12-01
EP1480538B1 true EP1480538B1 (en) 2006-05-10

Family

ID=3670799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03704087A Expired - Lifetime EP1480538B1 (en) 2002-02-26 2003-02-11 Work table

Country Status (7)

Country Link
US (1) US6977476B2 (en)
EP (1) EP1480538B1 (en)
AT (2) AT410626B (en)
AU (1) AU2003206486A1 (en)
DE (1) DE50303288D1 (en)
DK (1) DK1480538T3 (en)
WO (1) WO2003071897A1 (en)

Families Citing this family (21)

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Publication number Priority date Publication date Assignee Title
DK1460914T4 (en) † 2001-12-13 2021-08-30 Linak As An adjustable construction, preferably a piece of furniture and a clamp protection as well as a drive unit therefor
AT501146B8 (en) * 2005-03-25 2007-02-15 Logicdata Elect & Software Ent BENCH
SE0802030L (en) * 2008-09-24 2009-11-17 Swedestyle Ab Device for mounting a table top on a rack with drive means
US7862409B1 (en) 2009-04-14 2011-01-04 Sheppard Barbara L Motorized height-adjustable table apparatus
DE102009058422B4 (en) 2009-12-16 2015-05-07 Logicdata Electronic & Software Entwicklungs Gmbh Apparatus and method for collision detection of a movable furniture portion with an obstacle
EP2479886B1 (en) * 2011-01-19 2016-11-02 KIH-utveckling AB Method for controlling operation of an electric motor in a height-adjustable furniture arrangement
DK2583586T4 (en) 2011-10-18 2021-10-25 Kesseboehmer Produktions Gmbh & Co Kg ARRANGEMENTS FOR COLLISION REGISTRATION AND SIMILAR PROCEDURE
US10038952B2 (en) 2014-02-04 2018-07-31 Steelcase Inc. Sound management systems for improving workplace efficiency
US10085562B1 (en) 2016-10-17 2018-10-02 Steelcase Inc. Ergonomic seating system, tilt-lock control and remote powering method and appartus
US10827829B1 (en) 2012-10-10 2020-11-10 Steelcase Inc. Height adjustable support surface and system for encouraging human movement and promoting wellness
US9486070B2 (en) 2012-10-10 2016-11-08 Stirworks Inc. Height-adjustable support surface and system for encouraging human movement and promoting wellness
KR102053015B1 (en) * 2015-04-23 2020-01-08 티모션 테크놀로지 코., 엘티디. Electrical Adjustable Table and Control Method for Electrical Adjustable Table
DE202015103821U1 (en) * 2015-07-17 2016-10-18 moll Funktionsmöbel GmbH table furniture
CN106483985B (en) 2015-08-24 2020-09-08 第一传动科技股份有限公司 Portable device for controlling lifting equipment and lifting equipment control method
US9921726B1 (en) 2016-06-03 2018-03-20 Steelcase Inc. Smart workstation method and system
CN206390562U (en) 2016-09-23 2017-08-11 廖良成 Electric lifting computer desk and its desk
US11019920B2 (en) 2016-09-23 2021-06-01 Varidesk, Llc Electrically-lifted computer desk and office desk thereof
CN206835028U (en) * 2017-05-25 2018-01-02 嘉兴礼海电气科技有限公司 A kind of electric elevatable table controller of anticollision
DE102017125390A1 (en) * 2017-10-30 2019-05-02 Karsten Laing Method for detecting the occupancy state of at least one piece of furniture and electrically adjustable piece of furniture
CN109700173A (en) * 2018-05-31 2019-05-03 乐歌人体工学科技股份有限公司 Same table control method
US11510487B2 (en) * 2018-12-06 2022-11-29 Zhejiang Jiecang Linear Motion Technology Co., Ltd. Desktop lifting platform with improved safety

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Publication number Priority date Publication date Assignee Title
JPS56123783A (en) * 1980-02-29 1981-09-29 Nippon Denso Co Ltd Control unit for load driving
US5723959A (en) * 1992-08-04 1998-03-03 Tokai-Rika-Denki Seishakusho Kabushiki Kaisha Power window driving control device
AT406631B (en) * 1999-03-10 2000-07-25 Koch Walter Dipl Ing Working table

Also Published As

Publication number Publication date
EP1480538A1 (en) 2004-12-01
AT410626B (en) 2003-06-25
US6977476B2 (en) 2005-12-20
AU2003206486A1 (en) 2003-09-09
DK1480538T3 (en) 2006-09-11
US20050082997A1 (en) 2005-04-21
ATA2842002A (en) 2002-11-15
WO2003071897A1 (en) 2003-09-04
ATE325558T1 (en) 2006-06-15
DE50303288D1 (en) 2006-06-14

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