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EP1810396A1 - Mecanisme d'elevation et d'abaissement d'un plateau de table - Google Patents

Mecanisme d'elevation et d'abaissement d'un plateau de table

Info

Publication number
EP1810396A1
EP1810396A1 EP05799324A EP05799324A EP1810396A1 EP 1810396 A1 EP1810396 A1 EP 1810396A1 EP 05799324 A EP05799324 A EP 05799324A EP 05799324 A EP05799324 A EP 05799324A EP 1810396 A1 EP1810396 A1 EP 1810396A1
Authority
EP
European Patent Office
Prior art keywords
motor
drive mechanism
tabletop
rotor
mechanism according
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Withdrawn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
EP05799324A
Other languages
German (de)
English (en)
Inventor
Henrik Jul Nielsen
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.)
Labofa Munch AS
Original Assignee
Labofa Munch AS
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 Labofa Munch AS filed Critical Labofa Munch AS
Publication of EP1810396A1 publication Critical patent/EP1810396A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
    • H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
    • H02P7/04—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of a H-bridge circuit

Definitions

  • the invention relates to tables and work desks having a drive mechanism for elevating and lowering the tabletop.
  • the drive mechanism for elevating and lowering the tabletop relative to the legs comprises one or more electric motors, which via a reduction gear such as a worm gear drive a rack in each leg.
  • a reduction gear such as a worm gear drive a rack in each leg.
  • Such mechanisms are usually not self-arresting and do not prevent the tabletop from being unintentionally lowered due to the load.
  • a permanent friction brake can be used, but this results in a considerable fric ⁇ tion loss, which makes it necessary to use high power and a more powerful motor to elevate the tabletop.
  • the tabletop may move up to several cm after the current to the motor has been cut off. This makes fine adjustment of the height of the table- top very difficult.
  • the drive mechanism can have a shaft encoder, which in response to the rotation of the motor shaft gives signals to a controller with a microprocessor.
  • the microprocessor thereby keeps track on the position of the tabletop and the height of each leg. Thereby the tabletop can be prevented from being driven to its extremes, and the legs are synchronised.
  • the shaft encoders can be magnetic, such as Hall effect sensors, or optical sensors.
  • the invention solves these problems and will be explained in connection with a drive mechanism having a controller with switching elements for selectively establishing first and second sets of connections, where the power supply terminals are connected to the motor terminals with opposite polarities, whereby the motor has opposite directions of rotation; and for selectively es ⁇ tablishing a third set of connections where the motor terminals are connected to each other, i.e. the motor is short-circuited, whereby the rotation of the mo ⁇ tor is retarded with a torque that is proportional to the motor speed and is particularly suited for stopping the motor.
  • the drive mechanism has a magnetic brake for retarding the rotation of the motor.
  • the magnetic brake comprises a stator and a rotor both of a magnetizable material, and the stator and/or the rotor are so magnetised that the rotor has one or more neutral angular positions relative to the stator to which the rotor is attracted due to magnetic forces between the stator and the rotor.
  • a controller controls the motor and calcu ⁇ lates the height of the tabletop based on the rotation of the rotor, and a sen ⁇ sor senses the rotation of the rotor and gives a signal when the rotor is in a predetermined angular position different from the neutral angular position.
  • the magnetic forces between the stator and the rotor prevent the rotor from reaching the predetermined angular position, when the tabletop is loaded with a load that does not exceed a nominal tabletop load.
  • a magnetic brake gives a braking torque that is independent of motor speed and is par ⁇ ticularly suited for use as a static brake for preventing the tabletop from being lowered due to either its own weight or to a load on the tabletop.
  • both embodiments are used together, whereby a simple mecha ⁇ nism provides both static and dynamic braking of the motor and the tabletop movements.
  • Figure 1 shows schematically a drive mechanism
  • Figure 2 shows the drive mechanism in figure 1 with a first set of connec- tions
  • Figure 3 shows the drive mechanism in figure 1 with a second set of connec ⁇ tions
  • Figure 4 shows the drive mechanism in figure 1 with a third set of connec ⁇ tions
  • Figures 5 and 6 show an embodiment of a magnetic brake according to the invention
  • Figure 7 shows a table with a tabletop that can be elevated
  • Figure 8 is a perspective view of a frame structure for at table
  • Figure 9 is a sectional view of the frame structure, seen from above;
  • Figure 10 shows a coupling for connecting a drive cable
  • Figure 11 shows an alternative frame structure for a table; and Figure 12 shows an exemplary drive mechanism 60 with a rotatable drive intake.
  • FIG 1 a drive mechanism for use with a table or a work desk having a tabletop that can be elevated and lowered.
  • the drive mechanism comprises an electric motor M, preferably a DC motor, with first and second motor terminals T1 and T2.
  • a power supply PWR has first and second power supply terminals P+ and P- for supplying electric power to the motor M through switching elements S1 , S2, S3 and S4 that are individually controlla ⁇ ble by a controller CTR.
  • the power supply and the controller are preferably enclosed in a common housing as indicated.
  • FIG 7 a table or work desk 10 with a tabletop 11 supported by legs 12. Below the tabletop is a motor housing 13 with a drive mechanism as in figure 1 for elevating and lowering the tabletop 11.
  • FIG 2 is shown the drive mechanism of figure 1 with the switching ele- ments S1 , S2, S3 and S4 controlled by the controller CTR to establish a first set of connections, where the switching elements S2 and S3 are open and the switching elements S1 and S4 are closed so that the first power supply terminal P+ is connected through the switching element S1 to the first motor terminal T1 and the second power supply terminal P- is connected through the switching element S4 to the second motor terminal T2, whereby the mo ⁇ tor has a first direction of rotation as indicated by the arrow.
  • a reduction gear such as a worm gear the motor elevates the tabletop.
  • FIG 3 is shown the drive mechanism with the switching elements S1 , S2, S3 and S4 controlled by the controller CTR to establish a second set of con ⁇ nections, where the switching elements S2 and S3 are closed and the switch- ing elements S1 and S4 are open so that the first power supply terminal P+ is connected through the switching element S2 to the second motor terminal T2 and the second power supply terminal P- is connected through the switching element S3 to the second motor terminal T2, whereby the motor has a sec- ond direction of rotation opposite the first direction as indicated by the arrow. With this set of connections the motor lowers the tabletop.
  • FIG 4 is shown the drive mechanism with the switching elements S1 , S2, S3 and S4 controlled by the controller CTR to establish a third set of connec- tions, where the switching elements S1 and S2 are closed and the switching elements S3 and S4 are open.
  • the first and second motor terminals T1 and T2 are hereby connected to each other. It is a well-known fact that an electric motor, which in this way has its terminals, short-circuited will exert a torque that resists rotation of the motor, and the torque will be proportional to the speed of the motor. In this configuration the drive mechanism will be used to stop the rotation of the motor after the tabletop has been elevated or lowered.
  • the switching elements S1 , S2, S3 and S4 can be solenoid operated elec ⁇ tromechanical switches or solid-state switches such as switching transistors.
  • FIG 5 is shown an embodiment of a magnetic brake 20 according to the invention with a stator 21 and a rotor 22 within the stator 21.
  • the magnetic brake 20 is connected to the motor M with the rotor 22 driven by the motor M.
  • the rotor 22 of the magnetic brake is mounted on the shaft of the motor M so that the rotor 22 rotates with the motor shaft.
  • the stator 21 is of a magnetizable material such as iron or ferrite and has been magnetised in any suitable manner such as by magnetising the stator it self or by placing mag ⁇ nets at the position of the poles.
  • the stator is shown with two magnetic poles N and S, but it can have any suitable number of poles.
  • the rotor may also be magnetised.
  • the rotor 22 is also of a magnetizable material such as iron or ferrite and has a cruciform cross section with four protruding arms. There is an air gap be ⁇ tween the outer ends of the arms and the inner surface of the stator 21. The magnetic forces between the stator and the rotor will attract the rotor to as- sume the angular position shown in figure 5, where the arms of the rotor are closest to the magnetic poled N and S of the stator, which is a neutral angu ⁇ lar position relative to the stator.
  • the rotor 22 is shown in an angular position different from the neu- tral angular position in figure 5, and in any such position the magnetic forces between the stator and the rotor will exert a torque on the rotor directed to the nearest neutral angular position.
  • a sensor 24 is arranged to sense the passage of an arm of the rotor at an angular position different from the neutral angular position relative to the sta ⁇ tor.
  • the sensor 24 can be a magnetic field sensor such as a Hall effect sen ⁇ sor, an optical sensor or a mechanical sensor suitable for the purpose.
  • the sensor 24 gives an output signal each time an arm of the rotor passes the sensor, and the output signals are counted by the controller CTR in the drive mechanism and used for calculating or estimating the position of the tabletop.
  • the motor M is sufficiently powerful to provide a torque that is greater than the maximum torque due to the magnetic forces between the stator and the rotor of the magnetic brake 20, and when the drive mechanism is operated to elevate or lower the tabletop, the magnetic brake will exert an oscillating torque on the motor shaft.
  • a simple static brake is hereby provided which ensures a stable position of the tabletop, and erroneous sensor signals are avoided. Hereby correct sen- sor signals are obtained that ensure reliable and repeatable tabletop posi ⁇ tions.
  • reference numeral 1 is used to designate a frame structure in ⁇ tended for supporting a not shown tabletop for providing a table, such as a work desk, which allows for low manufacturing costs and which allows for a synchronized raising and lowering of the tabletop.
  • the frame structure 1 comprises legs 5, 5' with feet 6 and a carrier beam 30 that may, as shown, have a U-shaped cross-section.
  • the carrier beam 30 combines with two transverse elements 35, 35' to support the tabletop .
  • the carrier beam may conveniently serve to receive and hide a d rive motor 40 and wires 50, the object of which will be subject to further detail below.
  • the table provided by means of the frame structure "1 is more specifically of the type where the tabletop can be elevated and lowered as needed.
  • the legs 5, 5' of the frame structure 1 is composed of two tubular profile elements, of which one outer tubular profile element is designated by refer ⁇ ence numeral 15, whereas an inner tubular profile element connected to the carrier beam 30 is shown by reference numeral 20> '.
  • the inner tubular profiled element 20' may, as needed, be shifted upwards and downwards relative to the outer tubular profiled element 15, whereby the tabletop ca n be brought to the de- sired height.
  • Drive mechanism 60 has a driven part in the form of a drive in ⁇ take, and a driving part, said driving part cooperating with eg a toothed ele ⁇ ment journalled interiorly of the tubular profile element 15 for bringing about said shifting of the interior tubular profiled element 20' and hence of the table- top.
  • the frame structure 1 is, as shown, provided with a motor 40 journalled in the carrier beam 30 at a distance from each leg 5, 5'.
  • the motor 40 has a rotat ⁇ ing shaft, the ends of which preferably form a respective drive outtake 41 , 41 ' as shown in Figure 9, and from each drive outtake a respective wire 50, 50' extends that is, at its opposite end, connected to a respective drive mecha ⁇ nism 60, 60'.
  • the wire 50, 50' is flexible, meaning that it may assume any randomly curving course without an ensuing need for performing an initial adaptation of the shape of the wire 50.
  • the wire 50 is able to travel past obstacles, such as bolts and reinforcement ribs arranged within the car ⁇ rier beam 30, said carrier beam 30 being optionally provided with eyelets through which the wire 50 may extend and serving to keep up the curved course of the wire 50.
  • obstacles such as bolts and reinforcement ribs arranged within the car ⁇ rier beam 30, said carrier beam 30 being optionally provided with eyelets through which the wire 50 may extend and serving to keep up the curved course of the wire 50.
  • the transmission of forces between the motor 40 and the drive mechanism 60 is accomplished by the wire 50 rotating about itself; and that may occur essentially independently of the course of the wire 50.
  • the wire 50, 50' is torsionally rigid, meaning that the wire 50, 50' is not significantly de ⁇ formed torsionally about its longitudinal axis during transmission of the forces required to operate the drive mechanism 60.
  • the wire 50, 50' is a steel wire with threads wound so as to enable the wire to pull both when the drive outtake 41 of the motor 40 turns the one way and also the other way and thereby it operates the drive mechanism 30 to cause the table to be ele ⁇ vated or lowered.
  • wire 50, 50' will also be able to travel 90° around corners and hence it is able to reach the ends of transverse elements 35, 35' in case the legs 5, 5' and their associated drive mechanisms 60 were alterna ⁇ tively to be arranged there.
  • Figure 10 shows the end of a wire 50 and the drive intake 65 of the drive mechanism 60.
  • a coupling 66 is shown by which the wire 50 can readily be connected to the drive intake 65.
  • the wire 50 comprises a cylindrical male coupling part 52 configured for being received in a hollow cylindrical female coupling part 66.
  • the female coupling part 66 comprises opposite flexible portions 67 that delimit mutually opposite introduction slots 64 for receiving mutually opposite complementary protrud ⁇ ing parts 54 on the male coupling part 52.
  • the introduction slots 64 form a releasable lock 68 for protruding elements 54, the male coupling part 52 pressing , during its introduction into the female coupling part 66, portions 67 apart, and said portions 67 snapping back to their starting position at a time when the lock 68 is able to secure a shoulder 58 on protruding elements 54.
  • Transmission of force between wire 50 and drive mechanism 60 may take place via cooperation between protrusions 54 and the wall of the female cou- pling parts 66 alone, or via further engagement.
  • one or more of drive mechanisms 60 may optionally be provided with a rotating drive outtake 69 coupled to the drive intake 65 and intended for interconnection of a further wire 50" connected to the further leg 5" as shown in Figure 11.
  • the motor 40 may be provided with more than two rotating drive outtakes.
  • a table that has a tabletop and a frame structure 1 for supporting the tabletop, wherein said frame structure 1 comprises at least one leg 5, the length of which can be varied for setting of the height of the tabletop, a drive mechanism 60 with a drive intake and cou ⁇ pled to the leg 5 to vary said length upon activation of said drive mechanism 60, and a motor 40 coupled to the drive mechanism 60.
  • the table is peculiar in that the drive intake 65 of the drive mechanism is connected to a drive out- take on the motor 40 via an elongate and flexible wire 50.
  • the wire assumes a curved course.
  • a table is provided in accordance with the above, wherein the wire 50 is torsionally rigid, meaning that the wire 50 is not signifi ⁇ cantly deformed about its longitudinal axis during transmission of force be- tween the motor 40 and the drive mechanism 60.
  • a table is provided in accordance with the above, wherein the wire 50 is a steel wire.
  • a table is provided in accordance with the above, wherein the steel wire has threads wound such that the wire 50 is able to operate the drive mechanism 60 in essentially the same way or in the same way when the drive outtake 41 of the motor 40 turns the one way or the other.
  • a table is provided in accordance with the above, wherein the frame structure comprises two legs (5, 5') with respective drive mechanisms 60; and wherein each drive mechanism 60, 60' is con ⁇ nected to the same motor 40 via a respective wire (50, 50').
  • each leg 5, 5' can be shifted telescopically.
  • a table is provided in accordance with the above and comprising a releasable snap-coupling 52, 66 between the wire 50 and the drive intake 65 of the drive mechanism 60.
  • a table with a frame structure 1 for support ⁇ ing the tabletop comprising two legs 5, 5', the length of which can be varied for setting of the height of the tabletop, characterised in it comprises two drive mechanisms 60, 60', each of which has a drive intake; in that each leg 5 is coupled to a respective one of drive mechanisms 60, 60', whereby said length is varied by activation of the respective drive mechanism 60, 60' of each leg 5, 5'; in that one and the same motor 40 is coupled to the two drive mechanisms 60, 60', the rotating drive intake 65 of the drive mechanism 60, 60' being connected to a respec ⁇ tive, rotating drive outtake on the motor 40 via an elongate and flexible force- transmitting element which is torsionally rigid, meaning that the force- transmitting element is not significantly deformed about its longitudinal axis during transmission of forces between the motor 40 and the drive mecha ⁇ nism.
  • a table is provided in accordance with the above, wherein the force-transmitting element is a rod.
  • the table discussed with reference to figs. 8-12 may be used without the claimed drive mechanism discussed with reference to figs. 1-7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Cette invention concerne un mécanisme d'entraînement à moteur électrique réversible dont la rotation peut être arrêtée par court-circuit. Ce système d'arrêt assure une plus grande précision. Un frein magnétique comporte un rotor présentant une ou plusieurs positions angulaires par rapport au stator. Une unité de commande commande le moteur et calcule la hauteur du plateau de table à partir de la rotation du moteur, cependant qu'un capteur envoie un signal lorsque le rotor se trouve dans une position angulaire prédéterminée autre que la position neutre. Les forces magnétiques qui s'exercent entre le stator et le rotor empêchent ce dernier d'atteindre la position angulaire prédéterminée lorsque le plateau de table supporte une charge qui ne dépasse pas un rapport table-charge nominal. Un tel frein exerce un couple qui est indépendant de la vitesse du moteur, ce qui empêche avantageusement le plateau de table de s'abaisser sous son propre poids ou sou l'effet d'une charge qu'il supporte.
EP05799324A 2004-11-05 2005-11-07 Mecanisme d'elevation et d'abaissement d'un plateau de table Withdrawn EP1810396A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA200401706 2004-11-05
DKPA200401712 2004-11-08
PCT/DK2005/000709 WO2006048023A1 (fr) 2004-11-05 2005-11-07 Mecanisme d'elevation et d'abaissement d'un plateau de table

Publications (1)

Publication Number Publication Date
EP1810396A1 true EP1810396A1 (fr) 2007-07-25

Family

ID=35759288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05799324A Withdrawn EP1810396A1 (fr) 2004-11-05 2005-11-07 Mecanisme d'elevation et d'abaissement d'un plateau de table

Country Status (2)

Country Link
EP (1) EP1810396A1 (fr)
WO (1) WO2006048023A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8027479B2 (en) 2006-06-02 2011-09-27 Coding Technologies Ab Binaural multi-channel decoder in the context of non-energy conserving upmix rules
US8193202B2 (en) 2008-04-21 2012-06-05 Lexicon Pharmaceuticals, Inc. LIMK2 inhibitors, compositions comprising them, and methods of their use
DE102014221699A1 (de) * 2014-10-24 2016-04-28 Suspa Gmbh Vorrichtung zum Höhenverstellen eines ersten Teils gegenüber einem zweiten Teil, Nachrüstsatz für eine derartige Vorrichtung sowie höhenverstellbares System umfassend mehrere derartige Vorrichtungen
WO2016198196A1 (fr) 2015-06-08 2016-12-15 Reac Ab Agencement de moteur électrique conçu pour être utilisé dans un actionneur et actionneur comprenant l'agencement de moteur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3305770A1 (de) * 1983-02-19 1984-08-23 Robert Bosch Gmbh, 7000 Stuttgart Schaltungsanordnung zum ein- und ausschalten eines elektromotorischen antriebes
JPS59172993A (ja) * 1983-03-23 1984-09-29 Hitachi Ltd 位置検出器付ｄｃモ−トルの逆回転防止装置
JPH062316U (ja) * 1992-06-12 1994-01-14 株式会社ニコン カメラ及びそのアクセサリーに使用されるモータ駆動装置
JP2594573Y2 (ja) * 1993-11-02 1999-04-26 住友電装株式会社 リレーの異常検知装置
DK175056B1 (da) * 1998-02-27 2004-05-10 Linak As Styring til elmotorer, navnlig i lineære aktuatorer
EP1079511A1 (fr) * 1999-08-26 2001-02-28 Linak A/S Alimentation pour moteurs cc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006048023A1 *

Also Published As

Publication number Publication date
WO2006048023A1 (fr) 2006-05-11

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