US20090071271A1 - Linear Actuator - Google Patents

Linear Actuator Download PDF

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Publication number
US20090071271A1
US20090071271A1 US11/667,493 US66749305A US2009071271A1 US 20090071271 A1 US20090071271 A1 US 20090071271A1 US 66749305 A US66749305 A US 66749305A US 2009071271 A1 US2009071271 A1 US 2009071271A1
Authority
US
United States
Prior art keywords
profile
linear actuator
actuator according
secured
spindle
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.)
Abandoned
Application number
US11/667,493
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English (en)
Inventor
Jens Jorgen Nielsen
Norbert Klinke
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.)
Linak AS
Original Assignee
Linak 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 Linak AS filed Critical Linak AS
Assigned to LINAK A/S reassignment LINAK A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KLINKE, NORBERT, NIELSEN, JENS JORGEN
Publication of US20090071271A1 publication Critical patent/US20090071271A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/04—Tables with tops of variable height with vertical spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/06—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member
    • F16H19/0663—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member with telescopic means, e.g. for supporting or shielding the reciprocating member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/06—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member
    • F16H19/0604—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising flexible members, e.g. an endless flexible member with means to double or half the stroke of the reciprocating member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18832—Reciprocating or oscillating to or from alternating rotary including flexible drive connector [e.g., belt, chain, strand, etc.]

Definitions

  • the present invention relates to a linear actuator of the type defined in the introductory portion of claim 1 .
  • lifting columns for beds are much more sturdy than lifting columns for tables, where the design of the latter is moreover an important parameter, because the lifting columns serve as table legs and thereby have a considerable influence on the appearance of the table.
  • drive units are desired which may be used in an arbitrary table leg directly or with just insignificant adaptations. This also means that the drive unit is slender and altogether takes up as little space as possible and may additonally be used for lifting columns with two extensible members
  • the invention is directed to lifting columns for height-adjustable tables, for which a variety of linear actuators are now available. All of these are largely based on spindle technique, viz. a hollow spindle in cooperation with a solid spindle. An example of this may be found in e.g. WO 02/39848 to Linak A/S and WO 01/78556 to Okin Deutschen für Antriebstechnik GmbH & Co. KG.
  • WO 03/003876 A1 discloses an individual example of a linear actuator based on a chain which is driven by an electric motor via a transmission. A rod is secured to each of the runs of the chain between two pairs of chain wheels, said rod being extended from its respective end of the actuator. Although the structure appears as an elongated rod, it is still rather bulky, all things considered.
  • the object of the invention is to provide a new structure of a linear actuator.
  • This new actuator according to the invention is constructed as stated in claim 1 , where the synchronous telescopic movement of the intermediate pipe and the inner profile is caused by a spindle and a cord element, respectively.
  • Cord element is here taken to mean a cord, a wire, a band, a tape, a chain and the like.
  • the unit per se is secured against rotation in that the inner profile is secured against rotation on the intermediate pipe and the spindle nut via the outer pipe.
  • Cord element is here taken to mean a cord, a wire, a band, a chain and the like or combinations thereof.
  • a guided chain length may be used, taking advantage of its rigidity, and ensuring a constant pull in the chain length by a wire when the inner profile is run in.
  • the inner profile and the intermediate pipe are configured with mutual means for guiding the inner profile on the pipe.
  • the inner profile is guided on the intermediate pipe and is thereby torsionally stable.
  • the guide may consist in the inner profile having a U-shaped cross-section, where the sides grip the intermediate pipe.
  • guide fins and grooves e.g. T-shaped guide fins, may be provided.
  • the leg is subjected to a considerable torque.
  • the actuator is secured to the leg via a skid coupling such that the foot can turn.
  • the skid coupling is adapted such that no greater movement than the permissible one is transferred to the actuator, but also such that the foot may manually be turned back. It may be an ordinary skid coupling based on frictional discs, spring-loaded balls, knurled pattern or the like.
  • FIG. 1 shows a sitting/standing table shown with a transparent tabletop
  • FIG. 2 shows an exploded view of an embodiment of the actuator according to the invention
  • FIG. 3 shows a perspective view of the actuator of FIG. 2 in an assembled state
  • FIG. 4 shows a perspective view of a slightly modified configuration of the actuator of FIGS. 2 and 3 , but shown without a motor housing,
  • FIG. 5 shows a longitudinal section through a telescopic leg for a table and provided with a second embodiment of the actuator according to the invention
  • FIG. 6 shows a cross-section of the telescopic leg
  • FIG. 7 shows the actuator of FIG. 5 shown without an outer profile and a motor housing
  • FIG. 8 shows the actuator of FIG. 7 shown partly as an exploded view
  • FIG. 9 shows an exploded view of mounting brackets with a skid coupling at the lower end of the actuator.
  • FIG. 1 of the drawing shows a sitting/standing table with a telescopic leg or lifting column at each side. It is observed that the tabletop is shown transparent.
  • the lifting column consists of a guide having three members, viz. an outermost section 1 , an intermediate section 2 and an innermost section 3 arranged telescopically inside each other, with slides arranged in the gaps between the individual sections.
  • the lower end of the outermost section 1 is secured in a foot 4
  • the upper end of the innermost section 3 is secured to the lower side of the tabletop 5 .
  • a drive device according to the invention is provided inside the lifting columns for causing the telescopic movement.
  • the drive device is formed by a linear actuator comprising a motor housing 6 containing a reversible electric motor and a transmission.
  • a spindle 7 is secured by a bracket 8 in a recess in the lower side of the motor housing.
  • the end of the spindle is provided with the one half of a claw coupling 9 .
  • a spindle nut 11 for the spindle is secured at the top of the intermediate profile, which is an extruded aluminium pipe 10 here.
  • a chain 12 extends along the one side of the intermediate profile 10 and around the end of the profile and up along the other side of it.
  • a bracket with a semicircular guide piece 13 is secured to the intermediate profile in order to guide the chain.
  • An inner profile 14 in the form of a rail is secured to the other end of the chain.
  • the chain is provided with a bracket 15 to which the inner profile is secured by screwing.
  • the inner profile is guided with side edges 16 in matching grooves on the intermediate profile 10 .
  • An outer profile 18 is secured by a bracket 17 to the other end of the chain, said outer profile being secured with its upper end to the motor housing 6 .
  • a wire (not shown in the drawing) is secured to the upper end of the inner profile 14 via a bracket 19 , said wire extending in a groove in the spindle nut 11 at the side of the spindle and being secured to the end of the chain by the bracket 17 .
  • the outer profile 18 will apply a pull to the wire via the firm connection with the spindle 17 over the housing 6 and thereby pull the end 15 of the chain.
  • FIG. 3 of the drawing shows a view of the actuator in an assembled state, but without transmission and motor.
  • the wire 20 and the bracket 19 can be seen faintly in the drawing.
  • a mounting bracket 21 is secured by two screws to the lower end of the inner profile 14 , said mounting bracket being unique in that it contains a skid coupling disposed between the part which is to be secured to the inner profile and the part which is intended to be secured to the lifting column.
  • the skid coupling is configured with a knurled pattern in two mutually facing faces of the bracket.
  • FIG. 4 of the drawing A simpler configuration of the actuator is shown in FIG. 4 of the drawing, where the intermediate profile 10 is just a four-sided steel pipe, and the inner profile 14 and the outer profile 18 are U-shaped rails which are guided with the sides toward the pipe.
  • the actuator is shown here without the motor housing.
  • FIGS. 5-9 of the drawing show a second embodiment of the actuator according to the invention, in which the same reference numerals are used for the same parts as are used in the foregoing.
  • the intermediate profile 10 and the outer profile 18 are here pipes of circular cross-section, with longitudinal ribs 35 arranged internally in the outer profile 18 , said ribs being fitted in grooves 22 in the spindle nut 11 for securing it against rotation.
  • the inner profile 14 is guided on the side of the intermediate profile 10 with a longitudinal T-shaped guide fin 23 thereon, and which is received in a corresponding groove 24 in the inner profile 14 , and which simultaneously secures it against rotation.
  • the lower end of the intermediate pipe 10 has secured thereon a cylindrical plug 25 with a through and guide hole for the inner profile 14 which has a substantially quadrangular cross-section.
  • the inner profile 14 is moved by a wire having two runs 26 a , 26 b extending opposite each other on the intermediate profile 10 .
  • the wires runs over a pair of deflection wheels 27 mounted in the spindle nut 11 , and at the bottom the wire runs about another pair of deflection wheels 28 mounted in the plug 25 on the end of the inner profile 14 .
  • the wire additionally runs around upper and lower guide faces 29 a , 29 b in an end plug 29 secured at the upper end of the inner profile 14 .
  • the ends of the wire are secured in the end plug 23 on the outer profile, which is configured here as a wire tensioner.
  • the end plug consists of two parts 23 a , 23 b , one part 23 a of which is provided with legs 30 configured with barbs, and the other part 23 b of which is provided with slots 31 to receive the legs of the first part 23 a .
  • the side walls of the slots are likewise provided with barbs for cooperation with the barbs on the legs.
  • the side walls of the slots 31 are configured to protrude freely upwards and resiliently toward each other to firmly engage the legs on the part 23 a . Pushing the part 23 a with the legs up toward the part 23 b results in tensioning of the wire. It is observed that only one wire is provided, and it is passed around the various deflection wheels and guide faces in a loop.
  • Rotation of the spindle 7 causes the intermediate profile 10 to be extended, and since the wire runs around the deflection wheels 28 at the outer end of the intermediate profile and up around the upper end 29 of the inner profile 14 , this is extended synchronously.
  • the intermediate profile 10 is pushed up, and the second wire run around the upper end 29 of the inner profile 14 and up around the uppermost deflection wheels 27 pulls the inner profile 14 along in the upward movement.
  • the three sections of the lifting column are secured to the actuator as follows.
  • the outermost section 1 is secured to the motor housing, while the intermediate section 2 is secured to the spindle nut 11 by two screws through diametrically disposed longitudinal slots 34 in the outer profile 18 of the actuator, and the screws are received in screw holes 32 .
  • the innermost section 3 is secured to the plug 25 at the end of the intermediate profile 10 , which takes place by screws into screw holes 33 .
  • the mounting bracket 21 configured as a skid coupling.
  • the mounting bracket comprises a first part 21 a in the form of a circular disc, where the side wall is configured with four bosses 36 on a portion of the side wall, a recess 37 being provided rearwardly so that the portions with bosses may yield resiliently.
  • This portion 21 a is received in a circular well 38 at the end of the second part 21 b of the mounting bracket.
  • the side wall of the well 38 has a wave shape 39 which fits the bosses 36 on the first part 21 a of the bracket.
  • Four towers 40 are provided on the lower side of the first part 21 a for reception in holes in the foot.
  • the first part 21 a is centered in the second part with a hole 41 around a hub 42 in the second part 21 and is retained by a screw in the hub, which has a screw hole 43 intended for the purpose. If the foot of the table encounters an obstacle, the skid coupling starts clicking so that the torque is not transferred further up to the vital parts of the actuator. Subsequently, the foot may be turned into position again. Of course, this may also be utilized for adjusting the foot, if it is desired to give it another position than precisely perpendicular to the longitudinal axis of the table.
  • the invention thus provides a particularly simple and slender structure of an actuator with a double stroke length.
  • the structure may be used directly, or with just simple adapters at the top of the leg immediately below the motor housing, in telescopic legs of any cross-section, including a circular crosssection, as the actuator per se is torsionally stable.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
US11/667,493 2004-11-17 2005-11-16 Linear Actuator Abandoned US20090071271A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA200401787 2004-11-17
DKPA200401787 2004-11-17
PCT/DK2005/000728 WO2006053559A2 (en) 2004-11-17 2005-11-16 A linear actuator

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2005/000728 A-371-Of-International WO2006053559A2 (en) 2004-11-17 2005-11-16 A linear actuator

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/067,457 Continuation US8408083B2 (en) 2004-11-17 2011-06-02 Linear actuator

Publications (1)

Publication Number Publication Date
US20090071271A1 true US20090071271A1 (en) 2009-03-19

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
US11/667,493 Abandoned US20090071271A1 (en) 2004-11-17 2005-11-16 Linear Actuator
US13/067,457 Expired - Fee Related US8408083B2 (en) 2004-11-17 2011-06-02 Linear actuator

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/067,457 Expired - Fee Related US8408083B2 (en) 2004-11-17 2011-06-02 Linear actuator

Country Status (6)

Country Link
US (2) US20090071271A1 (ja)
EP (1) EP1815166A2 (ja)
JP (1) JP2008520911A (ja)
CN (1) CN101061332B (ja)
AU (1) AU2005306159A1 (ja)
WO (1) WO2006053559A2 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140061394A1 (en) * 2012-09-06 2014-03-06 Aktiebolaget Skf Device for providing an electrical or fluid junction
US9018813B2 (en) 2009-11-28 2015-04-28 Linak A/S Linear actuator
USD738413S1 (en) * 2013-04-13 2015-09-08 Linak A/S Motor housing for a linear actuator
US20150283012A1 (en) * 2009-03-31 2015-10-08 Logicdata Electronic & Software Entwicklungs Gmbh Linear Actuator with a Rotating Brushless DC Motor
EP2949967A1 (en) 2014-05-29 2015-12-02 Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi Mechanism for reciprocating linear motion of a medical device
US10779640B2 (en) 2018-11-26 2020-09-22 Steelcase Inc. Cantilevered desk and components and method for the use thereof

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JP2008520911A (ja) * 2004-11-17 2008-06-19 リナック エー／エス リニアアクチュエータ
US8661744B2 (en) * 2007-04-16 2014-03-04 Falck Schmidt Defence Systems A/S Telescoping mast
DE102007057113A1 (de) * 2007-11-26 2009-05-28 Konrad Merkt Gmbh Hubsäulen-Antrieb
DK2160958T3 (da) * 2008-09-08 2016-09-19 Linak As Højdeindstilleligt bord
US20110308338A1 (en) * 2010-06-22 2011-12-22 Schluckebier Floyd A Force transfer assembly
DE102012224524B4 (de) * 2012-12-28 2014-07-10 Illinois Tool Works Inc. Kopplungsvorrichtung für eine Antriebsvorrichtung sowie Antriebseinrichtung
CN107257894B (zh) 2015-02-23 2023-05-02 拓诺麦公司 高速杆型线性致动器
US10072743B1 (en) 2016-09-02 2018-09-11 Michael Brian Wittig Rotary-to-linear transmission system
CN108223731A (zh) * 2018-02-28 2018-06-29 广西科技大学 一种伸缩杆

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US4892011A (en) * 1986-07-08 1990-01-09 Aisin-Warner Kabushiki Kaisha Planetary gear mechanism on an automatic transmission
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US20030000322A1 (en) * 2001-07-02 2003-01-02 Smc Kabushiki Kaisha Electric actuator
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US1815954A (en) * 1928-02-27 1931-07-28 Ramsey Chain Co Inc Automatic chain or belt tightener
US3630096A (en) * 1970-08-21 1971-12-28 Carl T Brewer Drive-tensioning apparatus
US4539450A (en) * 1981-07-10 1985-09-03 Siemens Aktiengesellschaft Disconnect switch
US4568808A (en) * 1983-04-29 1986-02-04 Alsthom-Atlantique Telescopic isolating switch
US4892011A (en) * 1986-07-08 1990-01-09 Aisin-Warner Kabushiki Kaisha Planetary gear mechanism on an automatic transmission
US4754949A (en) * 1987-09-08 1988-07-05 Rikuo Fukamachi Actuator for valve
US5489056A (en) * 1992-12-03 1996-02-06 Kabelmetal Electro Gmbh Endless chain conveying device with spring biased wedge tensioner
US20020043597A1 (en) * 2000-10-18 2002-04-18 Svenska Kenab Karlshamns Ergonomi Ab, Rotation-preventing device
US20030000322A1 (en) * 2001-07-02 2003-01-02 Smc Kabushiki Kaisha Electric actuator
US20040075736A1 (en) * 2002-10-17 2004-04-22 Fumio Yuasa Elevator device for television camera

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150283012A1 (en) * 2009-03-31 2015-10-08 Logicdata Electronic & Software Entwicklungs Gmbh Linear Actuator with a Rotating Brushless DC Motor
US9642758B2 (en) * 2009-03-31 2017-05-09 Logicdata Electronic & Software Entwicklungs Gmbh Linear actuator with a rotating brushless DC motor
US9018813B2 (en) 2009-11-28 2015-04-28 Linak A/S Linear actuator
US20140061394A1 (en) * 2012-09-06 2014-03-06 Aktiebolaget Skf Device for providing an electrical or fluid junction
US9267623B2 (en) * 2012-09-06 2016-02-23 Aktiebolaget Skf Device for providing an electrical or fluid junction
USD738413S1 (en) * 2013-04-13 2015-09-08 Linak A/S Motor housing for a linear actuator
USD752122S1 (en) * 2013-04-13 2016-03-22 Linak A/S Motor housing for a linear actuator
EP2949967A1 (en) 2014-05-29 2015-12-02 Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi Mechanism for reciprocating linear motion of a medical device
US10779640B2 (en) 2018-11-26 2020-09-22 Steelcase Inc. Cantilevered desk and components and method for the use thereof
US11284712B2 (en) 2018-11-26 2022-03-29 Steelcase Inc. Cantilevered desk and components and method for the use thereof
US11910914B2 (en) 2018-11-26 2024-02-27 Steelcase Inc. Cantilevered desk and components and method for the use thereof

Also Published As

Publication number Publication date
JP2008520911A (ja) 2008-06-19
EP1815166A2 (en) 2007-08-08
WO2006053559A3 (en) 2006-07-27
US8408083B2 (en) 2013-04-02
AU2005306159A1 (en) 2006-05-26
US20110296935A1 (en) 2011-12-08
WO2006053559A2 (en) 2006-05-26
CN101061332B (zh) 2011-08-17
CN101061332A (zh) 2007-10-24

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