EP1704797B1 - Worktable - Google Patents

Worktable Download PDF

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Publication number
EP1704797B1
EP1704797B1 EP06450040A EP06450040A EP1704797B1 EP 1704797 B1 EP1704797 B1 EP 1704797B1 EP 06450040 A EP06450040 A EP 06450040A EP 06450040 A EP06450040 A EP 06450040A EP 1704797 B1 EP1704797 B1 EP 1704797B1
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EP
European Patent Office
Prior art keywords
load
frame
bearing part
load bearing
base frame
Prior art date
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Active
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EP06450040A
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German (de)
French (fr)
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EP1704797A1 (en
Inventor
Walter Koch
Stefan Lukas
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Logicdata Electronic and Software Entwicklungs GmbH
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Logicdata Electronic and Software Entwicklungs GmbH
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
    • B25H1/14—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top
    • B25H1/16—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for adjusting the bench top in height
    • 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
    • A47B2200/006—Leg adjustment with a motor, e.g. an electric motor with table or desk equipped with limit switches

Definitions

  • the invention relates to a work table with a particular height-adjustable, a table top bearing frame, to whose adjustment at least one attacking on an actuator electric motor is provided with a control device.
  • the document SE 516479 C2 relates to a generic height-adjustable table with a load cell, which is designed for example as a strain gauge and detects when a motor movement, whether a load change is present. In such a case, a reversal of the direction of rotation and / or a stop of the engine is reacted.
  • the document WO 03/56976 A1 shows a height-adjustable table with, for example, spindle-driven motor in one or more legs.
  • a piezo speaker element is provided, which is used as a load sensor. With the piezoelectric element, in turn, the presence of a load change during operation of the motor can be detected.
  • the invention is therefore the object of a work table of the type described with simple structural means in such a way that obstacles in the trajectory of the work table can be detected in a simple manner with improved security, before with an impermissible force on the obstacle by the abutting work table is to be expected.
  • the invention solves the problem by a work table with the features of claim 1.
  • the load of at least one load-bearing part of the frame is detected directly via a strain gauge
  • the respective table loads can be monitored with a comparatively high accuracy, regardless of the respective friction conditions in the guide region of the adjustment of the frame or in the range of the actuator to a engage appropriate change in the load of the load-bearing part in the engine control and to switch off the electric motor, where appropriate, after a reversal of the direction of rotation can.
  • two or more load-bearing parts of the frame can be provided with the measuring strips, because due to the distribution of the total load of the work table on the monitored load-bearing parts, the load conditions can be determined more accurately.
  • strain gauges of the load-bearing part of the frame can be advantageously designed as a bending beam.
  • Such bending beams can be advantageously used to connect the actuator with the adjustment of the frame.
  • the load-bearing part provided with the strain gage can of course also be subjected to tension or pressure in the manner of a load cell.
  • the work table according to the Fig. 1 has 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 lengthwise.
  • the motors 4 each drive an actuator 5, for example a spindle drive or a rack.
  • a control device 6 is provided, which can be controlled via an input unit 7 and forms a conventional input field 8 for operating the work table.
  • the load cell 11, such as load cells or piezoelectric elements, thus act on the control device 6 with signals that depend on the load on the table top 1, so that the motors 4 can be controlled depending on the load on the table top 1 to start the tabletop 1 at an obstacle, be it below or above the table top 1, determine and dependent on the motors 4, if necessary, to turn off after a reversal of the direction of rotation can. Since in general must be expected with different table loads, not the size of the load, but the size of the load change for the control of the motors 4 is evaluated to detect a lowered obstacle.
  • strain gauges are used to capture the table load, which on a load-bearing part 13 of the frame 2 are arranged.
  • the load-bearing part 13 not according to the Fig. 1 formed by the support 10 of the table top 1, but by a bending beam, which connects the actuator 5 with the adjustment part 9 of the telescopic legs 3.
  • the conditional by the bending load of the load-bearing member 13 changes in length of the DehnmeßstMails 12 can be evaluated as a measure of the load of the part 13 and thus for the load on the table top 1 and used to control the motors 4.
  • the frame 2 serves as a load-bearing part for determining the respective table load, which in turn a corresponding control of the motors 4 allowed when approaching an obstacle.
  • the invention is not limited to the illustrated embodiments, because it is only important to provide a load-bearing part of the work table with a strain gauge.
  • the evaluation of this monitoring of the table load can detect obstacles regardless of whether they are above or below the table top 1.
  • the parts provided with the strain gauges indicate an additional load or a relief an obstacle on the top or bottom of the table top.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Description

Die Erfindung bezieht sich auf einen Arbeitstisch mit einem insbesondere der Höhe nach verstellbaren, eine Tischplatte tragenden Gestell, zu dessen Verstellung wenigstens ein an einem Stelltrieb angreifender elektrischer Motor mit einer Steuereinrichtung vorgesehen ist.The invention relates to a work table with a particular height-adjustable, a table top bearing frame, to whose adjustment at least one attacking on an actuator electric motor is provided with a control device.

Bei Arbeitstischen mit einem Gestell, das durch wenigstens einen von einem Motor angetriebenen Stelltrieb insbesondere der Höhe nach verstellt werden kann, besteht die Gefahr, daß bei einer Verstellung des Gestells ein Hindernis im Bereich des Stellweges angefahren wird, was eine Gefährdung des Hindernisses, aber auch des Arbeitstisches oder von Gegenständen auf dem Arbeitstisch mit sich bringt, wenn der Elektromotor nicht abgeschaltet wird. Um solche Hindernisse erfassen und dadurch Verletzungen vermeiden zu können, ist es bekannt ( AT 410 626 B ), die Steuereinrichtung für den Motor an einen Geber für die Motorbelastung anzuschließen, so daß bei einer Überschreitung einer vorgegebenen Motorbelastung der Motor über die Steuereinrichtung in seiner Drehrichtung umgepolt und nach einem dadurch bedingten Rückstellweg abgeschaltet werden kann. Da die Motorbelastung unter anderem auch von den Reibungsverhältnissen im Bereich des Stelltriebes und der Führungen des Verstellteils des Tischgestells abhängen und sich diese Reibungsverhältnisse ändern können, ist eine feinfühlige Erfassung der angefahrenen Hindernisse aufgrund einer Überwachung der Motorbelastung nicht möglich.For work tables with a frame that can be adjusted by at least one driven by a motor actuator especially the height, there is a risk that an obstacle in the range of the travel is approached in an adjustment of the frame, which is a threat to the obstacle, but also of the worktable or objects on the worktable when the electric motor is not switched off. To detect such obstacles and thereby prevent injuries, it is known ( AT 410 626 B ), to connect the control device for the engine to an encoder for the engine load, so that when exceeding a predetermined engine load, the motor can be reversed in the direction of rotation via the control device and switched off after a reset path caused thereby. Since the engine load depends inter alia on the friction conditions in the range of the actuator and the guides of the adjustment of the table frame and these friction conditions can change, a sensitive detection of the obstacles is not possible due to monitoring the engine load.

Das Dokument SE 516479 C2 betrifft einen gattungsgemäße höhenverstellbaren Tisch mit einer Lastzelle, die beispielsweise als Dehnmessstreifen ausgeführt ist und bei einer Motorbewegung detektiert, ob eine Laständerung vorliegt. In einem solchen Fall wird mit einer Umkehr der Drehrichtung und/oder einem Anhalten des Motors reagiert.The document SE 516479 C2 relates to a generic height-adjustable table with a load cell, which is designed for example as a strain gauge and detects when a motor movement, whether a load change is present. In such a case, a reversal of the direction of rotation and / or a stop of the engine is reacted.

Das Dokument WO 03/56976 A1 zeigt einen höhenverstellbaren Tisch mit beispielsweise spindelgetriebenen Motor in einem oder mehreren Tischbeinen. An einer lasttragenden Stelle ist ein Piezolautsprecherelement vorgesehen, welches als Lastsensor eingesetzt wird. Mit dem Piezoelement kann wiederum das Vorliegen einer Laständerung beim Betrieb des Motors detektiert werden.The document WO 03/56976 A1 shows a height-adjustable table with, for example, spindle-driven motor in one or more legs. At a load-bearing point a piezo speaker element is provided, which is used as a load sensor. With the piezoelectric element, in turn, the presence of a load change during operation of the motor can be detected.

Der Erfindung liegt somit die Aufgabe zugrunde, einen Arbeitstisch der eingangs geschilderten Art mit einfachen konstruktiven Mitteln so auszugestalten, daß Hindernisse in der Bewegungsbahn des Arbeitstisches in einfacher Weise mit verbesserter Sicherheit erfaßt werden können, bevor mit einer unzulässigen Krafteinwirkung auf das Hindernis durch den anschlagenden Arbeitstisch zu rechnen ist.The invention is therefore the object of a work table of the type described with simple structural means in such a way that obstacles in the trajectory of the work table can be detected in a simple manner with improved security, before with an impermissible force on the obstacle by the abutting work table is to be expected.

Die Erfindung löst die gestellte Aufgabe durch einen Arbeitstisch mit den Merkmalen des Anspruchs 1.The invention solves the problem by a work table with the features of claim 1.

Da zufolge dieser Maßnahmen die Belastung zumindest eines lastabtragenden Teils des Gestells unmittelbar über einen Dehnmeßstreifen erfaßt wird, können die jeweiligen Tischbelastungen mit einer vergleichsweise hohen Genauigkeit unabhängig von den jeweiligen Reibungsverhältnissen im Führungsbereich des Verstellteils des Gestells oder im Bereich des Stelltriebes überwacht werden, um bei einer entsprechenden Änderung der Belastung des lastabtragenden Teils in die Motorsteuerung eingreifen und den elektrischen Motor gegebenenfalls nach einer Umpolung der Drehrichtung abschalten zu können. Zur Verbesserung der Überwachung der Belastung des Arbeitstisches bzw. von Belastungsänderungen können zwei oder mehrere lastabtragende Teile des Gestells mit den Meßstreifen versehen werden, weil aufgrund der Aufteilung der Gesamtbelastung des Arbeitstisches auf die überwachten lastabtragenden Teile die Belastungsverhältnisse genauer ermittelt werden können.Since, according to these measures, the load of at least one load-bearing part of the frame is detected directly via a strain gauge, the respective table loads can be monitored with a comparatively high accuracy, regardless of the respective friction conditions in the guide region of the adjustment of the frame or in the range of the actuator to a engage appropriate change in the load of the load-bearing part in the engine control and to switch off the electric motor, where appropriate, after a reversal of the direction of rotation can. To improve the monitoring of the load of the work table or load changes two or more load-bearing parts of the frame can be provided with the measuring strips, because due to the distribution of the total load of the work table on the monitored load-bearing parts, the load conditions can be determined more accurately.

Beim Einsatz von Dehnmeßstreifen kann der lastabtragende Teil des Gestells vorteilhaft als Biegeträger ausgebildet sein. Solche Biegeträger lassen sich vorteilhaft zur Verbindung des Stelltriebes mit dem Verstellteil des Gestells einsetzen. Der mit dem Dehnmeßstreifen versehene lastabtragende Teil kann aber auch selbstverständlich nach Art einer Kraftmeßdose auf Zug oder Druck belastet werden.When using strain gauges of the load-bearing part of the frame can be advantageously designed as a bending beam. Such bending beams can be advantageously used to connect the actuator with the adjustment of the frame. However, the load-bearing part provided with the strain gage can of course also be subjected to tension or pressure in the manner of a load cell.

In den Zeichnungen ist in Figur 2 eine Ausführungsform der Erfindung beispielsweise dargestellt. Figuren 1 und 3 dienen der Erlauderung. Es zeigen

Fig. 1
einen Arbeitstisch in einer schematischen Seitenansicht nach Art eines Blockschaltbildes,
Fig. 2
das Gestell ausschnittsweise im Bereich eines der Länge nach verstellbaren Tischbeines in einem größeren Maßstab und
Fig. 3
eine Konstruktionsvariante eines Arbeitstisches in einer schematischen Stirnansicht.
In the drawings is in FIG. 2 an embodiment of the invention, for example, shown. FIGS. 1 and 3 serve the salvation. Show it
Fig. 1
a work table in a schematic side view in the manner of a block diagram,
Fig. 2
the frame fragmentary in the range of a lengthwise adjustable table leg on a larger scale and
Fig. 3
a construction variant of a work table in a schematic end view.

Der Arbeitstisch gemäß der Fig. 1 weist eine Tischplatte 1 auf, die von einem Gestell 2 getragen wird, das Teleskopbeine 3 zur Höhenverstellung der Tischplatte 1 besitzt. Diese Teleskopbeine 3 sind mit Hilfe elektrischer Motoren 4 der Länge nach verstellbar. Zu diesem Zweck treiben die Motoren 4 je einen Stelltrieb 5 an, beispielsweise einen Spindeltrieb oder eine Zahnstange. Zur Steuerung der Motoren 4 ist eine Steuereinrichtung 6 vorgesehen, die über eine Eingabeeinheit 7 angesteuert werden kann und ein übliches Eingabefeld 8 zum Bedienen des Arbeitstisches bildet.The work table according to the Fig. 1 has 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 lengthwise. For this purpose, the motors 4 each drive an actuator 5, for example a spindle drive or a rack. To control the motors 4, a control device 6 is provided, which can be controlled via an input unit 7 and forms a conventional input field 8 for operating the work table.

Die mit dem ausziehbaren Verstellteil 9 der Teleskopbeine 3 verbundenen Auflager 10 der Tischplatte 1 sind über Kraftaufnehmer 11 an den Stelltrieben 5 abgestützt. Die Kraftaufnehmer 11, beispielsweise Kraftmeßdosen oder Piezoelemente, beaufschlagen somit die Steuereinrichtung 6 mit Signalen, die von der Belastung der Tischplatte 1 abhängen, so daß die Motoren 4 in Abhängigkeit von der Belastung der Tischplatte 1 angesteuert werden können, um ein Anfahren der Tischplatte 1 an ein Hindernis, sei es unter- oder oberhalb der Tischplatte 1, feststellen und davon abhängig die Motoren 4 gegebenenfalls nach einer Umpolung der Drehrichtung abschalten zu können. Da im allgemeinen mit unterschiedlichen Tischbelastungen gerechnet werden muß, wird zur Erkennung eines angefahrenen Hindernisses nicht die Größe der Belastung, sondern die Größe der Belastungsänderung für die Steuerung der Motoren 4 ausgewertet.The supports 10 of the table top 1, which are connected to the extendable adjusting part 9 of the telescopic legs 3, are supported on the actuating drives 5 via force transducers 11. The load cell 11, such as load cells or piezoelectric elements, thus act on the control device 6 with signals that depend on the load on the table top 1, so that the motors 4 can be controlled depending on the load on the table top 1 to start the tabletop 1 at an obstacle, be it below or above the table top 1, determine and dependent on the motors 4, if necessary, to turn off after a reversal of the direction of rotation can. Since in general must be expected with different table loads, not the size of the load, but the size of the load change for the control of the motors 4 is evaluated to detect a stumbled obstacle.

Wie die Fig. 2 erkennen läßt, werden zur Erfassung der Tischbelastung Dehnmeßstreifen eingesetzt , die an einem lastabtragenden Teil 13 des Gestells 2 angeordnet sind. Im Ausführungsbeispiel nach der Fig. 2 wird der lastabtragende Teil 13 nicht entsprechend der Fig. 1 durch die Auflager 10 der Tischplatte 1, sondern durch einen Biegeträger gebildet, der den Stelltrieb 5 mit dem Verstellteil 9 der Teleskopbeine 3 verbindet. Die durch die Biegebelastung des lastabtragenden Teils 13 bedingten Längenänderungen des Dehnmeßstreifens 12 können als Maß für die Auflast des Teils 13 und damit für die Belastung der Tischplatte 1 ausgewertet und zur Steuerung der Motoren 4 herangezogen werden.As the Fig. 2 can be detected, strain gauges are used to capture the table load, which on a load-bearing part 13 of the frame 2 are arranged. In the embodiment of the Fig. 2 is the load-bearing part 13 not according to the Fig. 1 formed by the support 10 of the table top 1, but by a bending beam, which connects the actuator 5 with the adjustment part 9 of the telescopic legs 3. The conditional by the bending load of the load-bearing member 13 changes in length of the Dehnmeßstreifens 12 can be evaluated as a measure of the load of the part 13 and thus for the load on the table top 1 and used to control the motors 4.

In der Fig. 3 ist eine weitere Möglichkeit einer Anordnung von Kraftaufnehmern 11 angedeutet, und zwar zwischen den Teleskopbeinen 3 und einem auf einer Standfläche aufruhenden Fußteil 14 des Gestells 2. Damit dient das Gestell 2 als lastabtragender Teil zur Bestimmung der jeweiligen Tischbelastung, was wiederum eine entsprechende Ansteuerung der Motoren 4 beim Anfahren eines Hindernisses erlaubt.In the Fig. 3 another possibility of an array of force sensors 11 is indicated, between the telescopic legs 3 and resting on a footprint foot part 14 of the frame 2. Thus, the frame 2 serves as a load-bearing part for determining the respective table load, which in turn a corresponding control of the motors 4 allowed when approaching an obstacle.

Es braucht wohl nicht besonders hervorgehoben zu werden, daß die Erfindung nicht auf die dargestellten Ausführungsbeispiele beschränkt ist, weil es lediglich darauf ankommt, einen lastabtragenden Teil des Arbeitstisches mit einem Dehnmeßstreifen zu versehen. Die Auswertung dieser Überwachung der Tischbelastung kann dabei Hindernisse unabhängig davon erfassen, ob sie sich ober- oder unterhalb der Tischplatte 1 befinden. Je nach der Anordnung . der mit den Dehnmeßstreifen versehenen Teile zeigt eine zusätzliche Belastung oder eine Entlastung ein Hindernis auf der Ober- oder Unterseite der Tischplatte an.It need not be emphasized that the invention is not limited to the illustrated embodiments, because it is only important to provide a load-bearing part of the work table with a strain gauge. The evaluation of this monitoring of the table load can detect obstacles regardless of whether they are above or below the table top 1. Depending on the arrangement. the parts provided with the strain gauges indicate an additional load or a relief an obstacle on the top or bottom of the table top.

Claims (3)

  1. A working table having a base frame (2), adjustable particularly in height, at least one electric motor (4) engaging with an actuating drive (5) being provided for adjusting said frame, and having a control device (6), at least one load bearing part (13) of the base frame (2) having a strain gauge (12), and the strain gauge (12) controlling the control device (6) for the motor (4) depending on the amount of the load change of the load bearing part (13), characterized in that the load bearing part (13) having the strain gauge (12) connects the actuating drive (5) to an adjustable part (9) of a telescoping leg (3) of the base frame (2).
  2. The working table according to claim 1, characterized in that the load bearing part (13) is designed as a bending beam.
  3. The working table according to claim 1 or 2, characterized in that two or more load bearing parts of the base frame (2) have strain gauges (12).
EP06450040A 2005-03-25 2006-03-22 Worktable Active EP1704797B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0052005A AT501146B8 (en) 2005-03-25 2005-03-25 BENCH

Publications (2)

Publication Number Publication Date
EP1704797A1 EP1704797A1 (en) 2006-09-27
EP1704797B1 true EP1704797B1 (en) 2011-08-03

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ID=36463373

Family Applications (1)

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Country Status (5)

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US (1) US20060266791A1 (en)
EP (1) EP1704797B1 (en)
AT (2) AT501146B8 (en)
DE (1) DE202006020137U1 (en)
DK (1) DK1704797T3 (en)

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US11662200B2 (en) 2018-04-18 2023-05-30 Logicdata Electronic & Software Entwiclungs Gmbh Sensor assembly, actuator, control system, electrically adjustable piece of furniture and method for operating an electrically adjustable piece of furniture
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US6286441B1 (en) * 1999-04-30 2001-09-11 Steelcase Development Corporation Height adjustable work surface and control therefor
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US6585079B1 (en) * 1999-12-14 2003-07-01 1994 Weyer Family Limited Partnership Work platform with rotary actuator
SE516479C2 (en) 2000-05-11 2002-01-22 Artektron Ab Device is for automatic stopping and-or reversing table top ascending movement to counteract jamming tendency, with table being raisable and lowerable by motor drive
DE10115598C1 (en) * 2001-03-29 2002-07-11 Schulte Bunert Gmbh Jointing machine has drive motor connected to helical gear, linear guides, control, force transducer, support plates, platform and slide guide
ES2299621T3 (en) 2001-12-13 2008-06-01 Linak A/S ADJUSTABLE STRUCTURE, PREFERENTLY FURNITURE ARTICLE, PROTECTION AGAINST APRISIONING AND ASSOCIATED DRIVING UNIT.
AT410626B (en) 2002-02-26 2003-06-25 Koch Walter Dipl Ing 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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9326597B2 (en) 2009-12-16 2016-05-03 Logicdata Electronic & Software Entwicklungs Gmbh Device and method for detecting a collision of a displaceable furniture part and an obstacle
US11662200B2 (en) 2018-04-18 2023-05-30 Logicdata Electronic & Software Entwiclungs Gmbh Sensor assembly, actuator, control system, electrically adjustable piece of furniture and method for operating an electrically adjustable piece of furniture
DE202021103270U1 (en) 2021-06-17 2022-10-06 Veyhl Gmbh Height-adjustable table leg, table frame and table
WO2022263284A1 (en) 2021-06-17 2022-12-22 Veyhl Gmbh Vertically adjustable table leg, table frame and table
DE102021206231A1 (en) 2021-06-17 2022-12-22 Veyhl Gmbh Height-adjustable table leg, table frame and table
EP4273558A1 (en) * 2022-05-04 2023-11-08 Rol Ergo AB Collision detection device for adjustable furniture
WO2023213762A1 (en) * 2022-05-04 2023-11-09 Rol Ergo Ab Collision detection device for adjustable furniture

Also Published As

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DE202006020137U1 (en) 2007-12-20
AT501146A4 (en) 2006-07-15
US20060266791A1 (en) 2006-11-30
EP1704797A1 (en) 2006-09-27
AT501146B8 (en) 2007-02-15
ATE518446T1 (en) 2011-08-15
DK1704797T3 (en) 2011-11-21
AT501146B1 (en) 2006-07-15

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