• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention refers to a pull cord arrangement for a roller blind or a Venetian blind, comprising a winding element (4) arranged to be connected to a blind (6) such that the blind (6) is released or wound in response to a rotational movement of the winding element (4) about a rotational axis; a connecting element (28) coupled to the winding element (4) to rotate together with the winding element (4); and a pull cord (50) engaging the connecting element (28) so as to control the rotation of the connecting element (28) and thus the winding element (4) as the pull cord (50) is operated.
    公开号:SE1650957A1
    申请号:SE1650957
    申请日:2016-07-01
    公开日:2018-01-02
    发明作者:Zhang Bo
    申请人:Ikea Supply Ag；
    IPC主号:
    专利说明:

    PULL CORD MECHANISM Technical fieldThe present invention concerns a pull cord arrangement for a rollerblind or a venetian blind.
    Technical backgroundlt is well known in the art to use a pull cord mechanism to drive a window shade or a venetian blind. The pull cord mechanism typicallycomprises an endless cord which operatively communicates with the windowshade or the venetian blind to release or wind the same. ln the case of awindow shade a pulling of the endless cord is converted into a rotation of thetube holding the window shade. ln case of a venetian blind, a pulling of theendless cord results in a folding or unfolding of the pleated blind. The pullcord may be a cord or a bead cord. ln its simplest form, the endless cord is freely exposed. For a playfulchild this poses a problem, either by strangling or choking. lt is also a risk thatthe whole arrangement also is torn down.
    WO15/172754 presents one solution to the problem in which theendless cord is enclosed in a hollow rod provided with a slit. The endless cordis pulled by a slider which is arranged slidingly on the hollow rod whileengaging the endless cord. The slider comprises a biased control buttonwhich when subjected to a pressure engages the endless cord and in thisstate the slider can be slid along the hollow rod to either release or wind theblind. lf the window is large, or for a person who cannot reach the full windowheight, the control button can be released and the slider can be movedwithout contact with the cord, and by pressing the control button once moreallow the full height of the blind to be controlled. However, it may be difficultfor a user to understand how to operate the control button. ln addition, thelength of the rod may have to be adapted to the height of the windowopening. Thus, for large windows, the rod will be bulky. Also, it may beconsidered not to be very user-friendly, neither for disabled persons nor forfirst time users.
    SummaryOne object of the present invention is to provide a mechanism that is childproof. Another object is to provide a mechanism that is intuitive when itcomes to the understanding of how to operate the same. Further, themechanism should be easy to use for disabled people.
    These and other objects are solved by a pull cord arrangement for aroller blind or a venetian blind, comprising a winding element arranged to beconnected to a blind such that the blind is released or wound in response to arotational movement of the winding element about a rotational axis, aconnecting element coupled to the winding element to rotate together withthe winding element, and a pull cord engaging the connecting element so asto control the rotation of the connecting element and thus the winding elementas the pull cord is operated. The arrangement is characterized in that the ratiobetween the engagement diameter d of the connecting element at whichdiameter the pull cord operatively engages the connecting element and theouter diameter D of the winding element is smaller than 2:3.
    The term engagement diameter d is defined as the diametrical distanceas measured transverse the longitudinal centre axis L of the winding elementbetween the leading part and the trailing part of a looped shaped pull cordwhich operatively engages the connecting element. Accordingly, in case ofthe pull cord being a bead chain, the engagement diameter d is measuredbetween the cord of the leading part of the pull cord and the cord of thetrailing part of the pull cord.
    By the ratio, a gear change is provided that requires a reduced lengthof the stroke required to release or wind the blind. Accordingly, the length ofthe pull cord may be reduced. This allows the pull cord to be less eye-catching when hanging down along the window. The pull cord will also be lessattempting as a potential plaything for children and pets and it is less likelythat it will interfere with flowerpots and other decorations in and around thewindowsill.
    The pull cord may form a closed loop and be a bead chain, a toothedbelt, a perforated belt or a chain, and the connecting element may along itsouter circumference as seen transverse the rotational axis compriseprojections engaging the pull cord.
    The pull cord arrangement may further comprise a pull cord actuatorformed by a telescopic rod comprising a first rod and a second rod, thesecond rod being movable in relation to the first rod along a longitudinal 3 extension of the first rod, and wherein the pull cord is connected to thesecond rod, whereby the pull cord is operated by moving the second rodalong the longitudinal extension of the first rod. Accordingly, to release theblind, the telescopic rod is pulled and to be wound the telescopic rod ispushed. By the ratio between the diameters of the connecting element andthe winding element, the length of the first and second rod making up thetelescopic rod may be reduced. Thereby the telescopic rod will be less eye-catching. Also, the required stroke to release or wind the blind is reduced tothe same extent.
    The pull cord may be received inside the first rod. Thereby the pull cordis protected from being a plaything for children and pets. Also, there is no riskof the pull cord interfering with curtains, or with flowerpots and decorationsoften standing on the windowsill.
    The first rod may be pivotably arranged about the rotational axis of thewinding element. Thereby the pull cord actuator may be freely hanging in avertical position when not in use and when to be operated the operator maypivot the same away from the window frame and push/pull the telescopic rodto/from his body. lt is to be understood that the first rod with remained function may bearranged on the winding element or a connector interconnecting theconnecting element and the winding element, and wherein the first rod ispivotably arranged about the rotational axis of the winding element.
    The first rod may encase the connecting element. Thereby the centreline of the first rod may coincide with the extension of the pull cord. Thus noundue bending forces will be applied to the connecting element whenoperating the pull cord arrangement. Also, the engagement between theconnecting element and the pull cord is protected from interfering with foreignitems.
    The pull cord may in a position along its longitudinal extensioncomprise a carrier; wherein the first rod along its longitudinal extensioncomprises a slit in which the carrier of the pull cord is movably received; andthe second rod in a surface facing the slit comprises a locking elementengaging the carrier, whereby the pull cord is operated as the second rod ismoved along the first rod.
    The winding element may be a tube, the outer envelope surfacethereof forming a support onto which the blind of a roller blind is to be woundor a support onto which the strings of the venetian blind are to be wound. The tube may be supported by a central shaft forming the winding element or bedirectly connected to the connecting element.
    The winding element may comprise a spring providing a rotationalbiasing of the winding element. A biasing may be advantageous for blindshaving a length exceeding 1200 mm to thereby relieve the pull cordarrangement.
    The ratio between the engagement diameter d of the connectingelement at which diameter the pull cord operatively engages the connectingelement and the outer diameter D of the winding element may be smaller than1:2, more preferred smaller 1:3 and even more preferred smaller than 1:4.
    Further objects and advantages of the present invention will be obviousto a person skilled in the art reading the detailed description given belowdescribing different embodiments.
    Brief description of the drawinqs The invention will be described in detail with reference to the schematicdrawings.
    Fig. 1 discloses a window with a roller blind.
    Fig. 2 discloses an exploded view of a pull cord arrangement accordingto the present invention.
    Fig. 3 discloses an exploded view of the pull cord arrangement.
    Fig. 4a discloses the pull cord arrangement set to its fully woundposition. To facilitate the understanding the pull cord actuator has been partlyremoved.
    Fig. 4b discloses the operation of the pull cord arrangement whenoperating the pull cord actuator to release the blind.
    Figs. 5a and 5b schematically disclose the pull cord arrangement whenreleasing the blind.
    Detailed descriptionNow turning to Fig. 1 a window with a roller blind 1 is schematically disclosed. The roller blind 1 is mounted at its two opposing free edges alongthe upper border of the window frame 100 by means of holders 2. The rollerblind 1 is operated by a pull cord actuator 3. The invention will throughout thedescription and the illustrations refer to a roller blind. The very same principleis equally applicable to a venetian blind. The essential difference is that 5 instead of winding a blind onto the winding element, the cords of the venetianblind are wound onto the winding element.
    Now turning to Fig. 2 an exploded view of the pull cord arrangement isdisclosed. Starting from the left, the arrangement discloses a winding element4 which in the disclosed embodiment is formed by a tube 5 having a circularcross section. The winding element has an outer diameter D.
    A blind 6 is wound onto the outer circumference of the winding element4. The blind 6 may be any type of material suitable for winding, such astextile, plastic, metal film or paper.
    The inner wall 7 of the tube 5 is provided with at least one projection 8.ln the disclosed embodiment a plurality of projections are used, each havingan extension in parallel with the longitudinal center axis L of the windingelement 4 and hence the rotational axis.
    The winding element 4 may be provided by extrusion and cut todesired length depending on the width of the window frame 100.
    A first connector 9 is connected to the free end of the winding element4. The first connector 9 has a tube shaped portion 10 and a flange portion 11.The tube shaped portion 10 is provided along its outer circumferential wallwith at least one groove 12 adapted to engage the at least one projection 8 ofthe winding element 4. Thereby the first connector 9 will connect to and rotatetogether with the winding element 4.
    The flange portion 11 is on its surface facing away from the windingelement 4 provided with a first neck portion 13. The first neck portion 13 hasan extension along the longitudinal centre axis L of the winding element 4.The first neck portion 13 is along its end surface 14 extending transverse thelongitudinal center axis L provided with a plurality of radial projections 15. Theradial projections 15 are adapted to engage a pull cord 50 to be discussedbelow. The radial projections 15 serve as teeth engaging the interspacebetween subsequent links of the pull cord 50. ln case the pull cord 50 being aball chain 51 with a plurality of balls 52 interconnected by a cord 53, one ball52 is received between two adjacent radial projections 15.
    The first connector 9 further comprises a channel 16 coinciding withthe longitudinal centre axis L. The inner circumferential wall 17 of the channel16 is provided with at least one projection 18 having an extension in parallelwith the longitudinal centre axis L.
    The first connector 9 may by formed as a unitary body by e.g. injectionmolding a plastic material.
    The pull cord arrangement further comprises a second connector 19.The second connector 19 has a longitudinal extension comprising a tubeshaped portion 20 and a flange portion 21. The tube shaped portion 20 isalong its outer circumferential wall 22 provided with at least one groove 23adapted to engage the at least one projection 18 of the channel 16 of the firstconnector 9. Thereby the first connector 9 will connect to and rotate togetherwith the second connector 19 and hence together with the winding element 4.
    The second connector 19 may be formed as a unitary body by e.g.injection molding a plastic material.
    The flange portion 21 of the second connector 19 has a radialextension. The flange portion 21 is on its surface facing the winding element 4provided with a second neck portion 24. The second neck portion 24 has anextension along the longitudinal centre axis L of the winding element 4. Thesecond neck portion 24 is along its end surface 25 provided with a plurality ofradial projections 26 adapted to engage the pull cord 50.
    The number of radial projections 15 of the first connector 9 and theircircumferential distribution equals the number of radial projections 26 of thesecond connector 19 and their circumferential distribution. Further, theposition of the at least one projection 18 of the first connector 9 mating the atleast one groove 23 of the second connector 19 ensures that when the tubeshaped portion 20 of the second connector 19 is inserted into the channel 16of the first connector 9, the radial projections 15, 26 of the first and thesecond connectors 9, 19 will be longitudinally aligned to thereby form radialpockets 27. This is best seen in Fig. 4a.
    Thus, in the disclosed embodiment a connecting element 28 is definedby the first and second neck portions 13, 24 of the first and secondconnectors 9, 19 abutting each other. The connecting element 28 can beseen as a sprocket with a number of teeth formed by the radial projections 15,26 and intermediate pockets 27. Each pocket 27 is adapted to engage anindividual link of a pull cord 50. ln case of the pull cord 50 being a ball chain,each ball 52 constitutes a link.
    As can be seen in Fig. 4a, the radial projections 15, 26 may be slantedin the radial direction to accommodate the cord 53 interconnecting theindividual balls 52 of the ball chain.
    The connecting element 28 exhibits an engagement diameter d. Theengagement diameter d is defined as the diametrical distance as measuredtransverse the longitudinal centre axis L of the winding element 4 between the leading part 50a and the trailing part 50b of the looped shaped pull cord 50when the pull cord 50 operatively engages the connecting element 28.Accordingly, in case of the pull cord 50 being a bead chain, the engagementdiameter d is measured between the cord 53 of the leading part 50a of thepull cord 50 and the cord 53 of the trailing part 50b of the pull cord 50.
    The ratio between the engagement diameter d of the connectingelement 28 and the outer diameter D of the winding element 4 should besmaller than 1:2 and more preferred smaller than 1:3 and even morepreferred smaller than 1:4.
    Now turning to Fig. 2 anew, the second connector 19 has a throughchannel 29 coinciding with the longitudinal center axis L of the windingelement 4. The through channel 29 is adapted to receive and engage a shaft30 extending there through. When inserted into the through channel 29, a firstend 31a of the shaft 30 extends past the second connector 19 away from thewinding element 4. The second end 31 b of the shaft 30 extends into the firstconnector 9 and rests against a non disclosed anvil. Further, the shaft 30supports a biasing spring 32 which provides a rotational biasing of thewinding element 4. The first end 31a end of the shaft 30 is adapted to engagea holder 2.
    The holder 2 is adapted to be mounted to the window frame 100 tothereby support the roller blind 1. ln it easiest form, the holder 2 is providedas a L-shaped member. The first flange 33 of the L-shaped holder is providedwith holes 34 for mounting the holder 2 to the window frame 100. The secondflange 35 is provided with a through hole 36 adapted to rotatably receive thefirst end 31a of the shaft 30. To allow the rotation, the through hole 36 has adiameter that slightly exceeds the diameter of the first end 31a of the shaft 30.
    As given above the pull cord 50 is arranged to engage the connectingelement 28 that is defined between the first and second connectors 9, 19. Thepull cord 50 is provided along its longitudinal extension with a carrier 37. Thecarrier 37 may be arranged as a chain lock keeping the free ends of the pullcord 50 together. ln the disclosed embodiment the carrier 37 is formed as two parts 38a,38b arranged one on top of the other to thereby enclose the pull cord 50. Thetwo parts 38a, 38b may engage each other by means of e.g. adhesive, ascrew or a snap-lock. The carrier 37 comprises in a surface facing away fromthe pull cord 50 a projection 39.
    Now turning to Fig. 3, the pull cord actuator 60 will be described. Thepull cord actuator 60 is formed as a telescopic rod comprising a first rod 61and a second rod 62. The first rod 61 is adapted to encase the connectingelement 28 and is pivotably arranged about the rotational axis and hence thelongitudinal centre axis L of the winding element 4. The first rod 61 comprisesin its upper end a through hole 63 adapted to encase the connecting element28.
    The first rod 61 comprises is the disclosed embodiment a rectangularcross section. lt goes without saying that other cross sections are possible. ltis however preferred that a non-rotation symmetrical cross section is used.
    The first rod 61 comprises, in a wall portion 67 extending in parallelwith the longitudinal center axis L of the winding element, a longitudinal slit64. The slit 64 is adapted to engage the projection 39 of the carrier 37.
    The first rod 61 comprises in its lower end a pulley 65 engaging the pullcord 50. The pull cord 50 is accordingly adapted to be received inside the firstrod 61 and extend between the pulley 65 and the connecting element 28.
    The first rod 61 comprises along its interior longitudinal extension apartition wall 66. When the pull cord 50 is arranged inside the first rod 61, thecarrier 37 is adapted to be guided along the interior of the first rod 61 betweenthe partition wall 66 and the opposed slit wall portion 67.
    The second rod 62 encloses the first rod 61 and is guided by the samein a telescopic manner. Accordingly, the second rod 62 preferably has a crosssectional profile corresponding to the first rod 61 with the exception of the slit64.
    Now turning to Fig. 4a the assembled arrangement is disclosed. Forbetter understanding, a part of the first and second rods 61, 62 is removed.
    The closed loop of the pull cord 50 engages the connecting element28. Further, the upper end of the first rod 61 is closed by a plug 68. The plug68 is also illustrated in the exploded view of Fig. 2.
    The upper end of the second rod 62 engages the carrier 37 via lockingelements 69, such as screws extending through the second rod 62 and intothe projection 39 of the carrier 37, which projection 39 extends through the slit64.
    Now turning to Fig. 4b and 5a-5b, the operation of the pull cordarrangement is illustrated. As the pull cord actuator 60 is operated by pullingthe second rod 62, see arrow A, the engagement between the second rod 62and the carrier 37 pulls the leading part 50a of the pull cord 50. By the non- 9 rotational engagement between the connecting element 28 and the windingelement 4, and the rotational engagement between the shaft 30 and theholder 2 (not disclosed in Fig. 4b), the pulling of the pull cord 50 will betransformed into a rotation of the winding element 4. The rotation of thewinding element 4 will result in a release of the blind 6, see arrow B. lf the second rod 62 instead is pushed along the first rod 61, i.e. in thedirection opposite arrow A, the rotational direction of the winding element 4will be reversed and hence the blind 6 will be wound, i.e. moved in a directionopposite arrow B.
    Due to the difference in the engagement diameter d of the connectingelement 28 and the outer diameter D of the winding element 4, a gear changewill result. By way of example, in case ofa ratio 1:2, a longitudinal mutualdisplacement between the first and second rods 61, 62 of the pull cordactuator 60 will result in the double winding/releasing length of the blind 6.Also, as a result of the gear change, the length of the pull cord 50 may bereduced to the same extent and hence also the length of the pull cordactuator 60.
    The pull cord 50 is encased by the pull cord actuator 60 whereby thereis no risk that it is considered as a plaything or something that can causechoking or strangulation. lt is appreciated that the embodiments of the invention as disclosedabove may be altered in different ways within the scope of the appendedclaims.
    By way of example, it is to be understood that the pull cordarrangement can be arranged on either end of the roller blind 1. ln the disclosed embodiment the pull cord 50 is formed by a beadchain. lt may also, with remained function be formed as toothed belt, aperforated belt of a chain. The skilled person will understand that the designof the radial projections 15, 26 of the first and second connectors 9, 19 mustbe adapted to the type of pull cord.
    The connecting element 28 can be arranged in a number of ways. ln itsmost simple form it may be arranged integral with the winding element. Also,it may be formed by the neck portions 13, 24 of one of the first and secondconnectors 9, 19 only.
    The winding element 4 may have other cross sections than circularwith remained function.
    权利要求:
    Claims (10)
    [1] 1. Pull cord arrangement for a roller blind or a venetian blind,comprising a winding element (4) arranged to be connected to a blind (6) such thatthe blind (6) is released or wound in response to a rotational movement of thewinding element (4) about a rotational axis, a connecting element (28) coupled to the winding element (4) to rotatetogether with the winding element (4), and a pull cord (50) engaging the connecting element (28) so as tocontrol the rotation of the connecting element (28) and thus the windingelement (4) as the pull cord (50) is operated, characterized in that the ratio between the engagement diameter d of the connectingelement (28) at which diameter the pull cord (50) operatively engages theconnecting element (28) and the outer diameter D of the winding element (4)is smaller than 2:3.
    [2] 2. Pull cord arrangement according to claim 1, wherein the pull cord(50) forms a closed loop and is a bead chain, a toothed belt, a perforated beltor a chain, and wherein the connecting element (28) along its outercircumference as seen transverse the rotational axis comprises projections(15, 26) engaging the pull cord (50).
    [3] 3. Pull cord arrangement according to any of the preceding claims,further comprising a pull cord actuator (60) formed by a telescopic rodcomprising a first rod (61) and a second rod (62), the second rod (62) beingmovable in relation to the first rod (61) along a longitudinal extension of thefirst rod (61), and wherein the pull cord (50) is connected to the second rod(62), whereby the pull cord (50) is operated by moving the second rod (62)along the longitudinal extension of the first rod (61).
    [4] 4. Pull cord arrangement according to claim 3, wherein the pull cord(50) is received inside the first rod (61).
    [5] 5. Pull cord arrangement according to claim 3 or 4, wherein the firstrod (61) is pivotably arranged about the rotational axis of the winding element (4)- 11
    [6] 6. Pull cord arrangement according to claim 5, wherein the first rod (4)encases the connecting element (28).
    [7] 7. Pull cord arrangement according to any of claims 3 to 6, whereinthe pull cord (50) in a position along its longitudinal extension comprises acarrier (37); the first rod (61) along its longitudinal extension comprises a slit (64) inwhich the carrier (37) of the pull cord is movably received; and the second rod (62) in a surface facing the slit (64) comprises a lockingelement (69) engaging the carrier (37), whereby the pull cord (50) is operated as the second rod (62) is moved alongthe first rod (61).
    [8] 8. Pull cord arrangement according to any of the preceding claims,wherein the winding element (4) is a tube (5), the outer envelope surfacethereof forming a support onto which the blind (6) of a roller blind (1) is to bewound or a support onto which the strings of the venetian blind are to bewound.
    [9] 9. Pull cord arrangement according to any of the preceding claims,wherein the winding element (4) comprises a spring (32) providing a rotationalbiasing of the winding element.
    [10] 10. Pull cord arrangement according to any of the preceding claims,wherein the ratio between the engagement diameter d of the connectingelement (28) at which diameter the pull cord (50) operatively engages theconnecting element (28) and the outer diameter D of the winding element (4)is smaller than 1:2, more preferred smaller 1:3 and even more preferredsmaller than 1:4.
    类似技术:
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    KR20120007977U|2012-11-21|Bead chain type pull cord mechanism for a window shade
    JP2016160653A|2016-09-05|Vertical window blind
    同族专利:
    公开号 | 公开日
    EP3478921B1|2021-01-20|
    WO2018004437A1|2018-01-04|
    SE540335C2|2018-07-03|
    EP3478921A4|2020-02-26|
    US20190169929A1|2019-06-06|
    PL3478921T3|2021-07-19|
    EP3478921A1|2019-05-08|
    US11236546B2|2022-02-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5472035A|1994-06-27|1995-12-05|Springs Window Fashions Division, Inc.|Window blind with wand operator|
    US5513687A|1994-08-08|1996-05-07|Newell Operating Company|Safety device for pull cords of window coverings|
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    CN102213070B|2011-05-13|2012-10-17|李七妹|Bead chain type rope pulling mechanism for curtain|
    US8739852B2|2011-07-05|2014-06-03|Hunter Douglas Inc.|Accumulating wand|
    CN202659117U|2012-05-18|2013-01-09|广州嘉伦橡塑有限公司|Venetian blind and operating device thereof|
    CZ27732U1|2014-05-15|2015-01-26|Zebr S.R.O.|Device for positioning Venetian blinds|US10208535B2|2016-12-06|2019-02-19|Norbert Marocco|Enclosed blind control|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650957A|SE540335C2|2016-07-01|2016-07-01|Pull cord mechanism|SE1650957A| SE540335C2|2016-07-01|2016-07-01|Pull cord mechanism|
    PL17820654T| PL3478921T3|2016-07-01|2017-06-28|Pull cord arrangement|
    EP17820654.6A| EP3478921B1|2016-07-01|2017-06-28|Pull cord arrangement|
    PCT/SE2017/050715| WO2018004437A1|2016-07-01|2017-06-28|Pull cord arrangement|
    US16/313,562| US11236546B2|2016-07-01|2017-06-28|Pull cord arrangement|
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