EP2369120B1 - Dual drum lift mechanism for venetian blinds - Google Patents
Dual drum lift mechanism for venetian blinds Download PDFInfo
- Publication number
- EP2369120B1 EP2369120B1 EP10173684.1A EP10173684A EP2369120B1 EP 2369120 B1 EP2369120 B1 EP 2369120B1 EP 10173684 A EP10173684 A EP 10173684A EP 2369120 B1 EP2369120 B1 EP 2369120B1
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- EP
- European Patent Office
- Prior art keywords
- lift
- drum
- cone
- mechanism according
- cord
- 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.)
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Links
- 230000007246 mechanism Effects 0.000 title claims description 57
- 230000009977 dual effect Effects 0.000 title description 5
- 238000004804 winding Methods 0.000 description 40
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
- E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
- E06B9/303—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable with ladder-tape
- E06B9/308—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable with ladder-tape with coaxial tilting bar and raising shaft
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
- E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
- E06B9/32—Operating, guiding, or securing devices therefor
- E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
- E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
- E06B9/32—Operating, guiding, or securing devices therefor
- E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
- E06B2009/3225—Arrangements to aid the winding of cords rollers
Definitions
- the present invention relates generally to lift mechanisms for Venetian blinds and more specifically to such mechanisms designed for Venetian blinds, in which pairs of lift cords are used.
- Venetian blinds A substantial number of lift mechanisms for Venetian blinds are known within the art Many of these mechanisms are designed for Venetian blinds, where the raising and lowering of the slats of the Venetian blind are accomplished with a number of single lift cords passed from the mechanism mounted in the head rail of the Venetian blind and through openings in the individual slats to the bottom rail of the Venetian blind.
- a lift mechanism as defined in claim 1 including the provision of a separate winding drum (which can be for instance of a a cylindrical or conical shape) for each lift cord of a given pair of lift cords.
- the above principle of the invention is implemented as a double cone (or drum) lift mechanism comprising a central portion containing guide means for the lift cords directing the two lift cords of a given pair of lift cords from the circumferential surface of said cone or drum downwards towards the slats and/or bottom rail of the Venetian blind.
- a central portion of the mechanism also comprises the tilt mechanism for the Venetian blind.
- one or more tilt mechanisms may alternatively be provided separately from the lift mechanism.
- the principle of the invention is implemented by separate winding drums placed alongside each other, i.e, with individual longitudinal axes extending substantially in parallel with each other.
- the two lifting cone or drum portions are extending, one for each of the lift cords of the given pair of lift cords.
- these cone or drum portions are rotated, for instance by a drive shaft extending through and in engagement with the cone or drum portions, the respective lift cords of the pair of lift cords become helically wound on or off the respective cone or drum portions.
- a cover part preferably of such a curvature that a uniform gap is created between the outer circumferential surface of the respective cone or drum portion and the adjacent surface of the cover, such that the lift cord when wound on the cone or drum portion is confined within this gap, thereby preventing entanglement of the helical windings of the lift cord on the surface of the cone or drum portion.
- the width of this gap can either be somewhat greater than or equal to the diameter of the lift cords.
- a lift mechanism for a Venetian blind, Venetian blind comprising two cone or drum portions, upon an outer circumferential surface of one of these portions one lift cord of a given pair of lift cords is wound upon rotation in a first direction of the drum portion and from which the lift cord is unwound upon rotation in an opposite second direction of the drum portion, and upon an outer circumferential surface of the other cone or drum portion, the other lift cord of a given pair of lift cords is wound upon rotation in said first direction of this other drum portion and from which the lift cord is unwound upon rotation in said opposite second direction of this as defined in claim 1.
- the lift cords pass through lift cord guide channels extending substantially tangentially to the corresponding outer circumferential surface of each respective cone or drum portion.
- the two cone or drum portions are provided coaxially with each other.
- the present invention also relates to the winding drums used for winding the lift cords of the Venetian blind.
- Such winding drums can comprise either one or more outer circumferential surface portions, upon which the lift cord is wound and the cross sections of these one or more winding portions of the total winding drum can according to various embodiments of the present invention assume different shapes.
- cone or drum winding portions of the mechanism comprise a first drum portion upon which the lift cord is wound or from which it is unwound and a second drum portion extending longitudinally from the first drum portion, to which second drum portion the lift cord is attached, wherein the first drum portion is substantially cylindrical or conical and where the cross sectional shape of the second portion is such that the circumference of the cross section of the second portion is less than the circumference of the first drum portion.
- the second drum portion has a cross section, whose boundary is piecewise linear.
- the boundary of the cross section of the second drum portion comprises curved portions.
- the cross sectional shape of the second drum portion is hexagonal, triangular, square or formed as an asterisk.
- the cross section of the second drum portion is circular over one or more angular sections ⁇ i and non-circular over one or more other angular sections ⁇ j .
- the maximum radial extension of the first and second drum portions may be equal to each other, but it would also be possible to provide first and second portions with different maximum radial extension without departing from the scope of the invention.
- a single drum according to the invention can be used alone, for instance in Venetian blinds comprising a number of single lift cords passed through apertures in the slats between a head rail containing the winding mechanisms and either the lowermost slat or a bottom rail of the Venetian blind.
- figure 1 shows a schematic perspective view of an embodiment of the lift mechanism according to the invention.
- the mechanism is generally designated by reference numeral 1 and comprises two cylindrical cone or drum portions 2 and 3 longitudinally provided to the right and left (as seen in figure 1 ) of a central portion that comprises a guide bracket 4 for the cone or drum portions and a track 10 for accommodating the tilt cords 6 of the Venetian blind.
- the cone or drum portions 2, 3 are provided with end caps 12 at either longitudinal end of the mechanism 1.
- a cover 11 is provided, the curvature of which substantially corresponds to that of the cone or drum portions such that a gap of substantially uniform width in the radial direction is created between the outer circumferential surface of those portions of the cone or drum portions that are covered by the cover 11.
- the radial width of this gap corresponds substantially to the diameter of the lift cords 5 so that the lift cords, when wound on the cone or drum portions 2, 3, are prevented from being entangled.
- the lift cords 5 are wound helically on/off the cone or drum portions 2, 3 as indicated by 8 and 9, respectively Towards the end of the cone or drum portions 2, 3 facing the central portion 4, 10, there is provided guide means, for instance formed as channels 15, 16 (see figure 4 ), leading the lift cords 5 and the tilt cords 6 towards the slats 7 of the Venetian blind.
- the cone or drum portions 2 and 3 are connected in the central part of the mechanism and are brought to rotate together by suitable drive means (not shown in the figures) that can either be provided separately for each separate mechanism 1 or provided as a common drive means for two or more of such mechanisms.
- the details of the mechanism I are more clearly visible in the exploded view of the embodiment of the invention shown in figure 2 .
- the upper cover part 11 is when the mechanism 1 is assembled, snap-fitted to the guide bracket 4 by engagement of radially resilient tongues 17 on the cover part and mating retainment means 18 on the guide bracket 4.
- FIG 3(a) there is shown a plane side view of the embodiment of figure 1 .
- Figure 3(b) is a cross sectional view along section A ⁇ A as indicated in figure 3(a) showing the provision of the tilt cord 6 around the middle section connecting the two cone or drum portions 2, 3 with each other,
- Figure 3(c) further shows a plane view of the embodiment of figures 1 and 3(a) seen from one longitudinal end hereof
- FIG 4 there is shown the embodiment of figures 1 and 3(a) seen from below, i.e. from the slats of the Venetian blind, along section B ⁇ B as indicated in figure 3(a) .
- the lift cords 5' enter from below through a lift cord guide channel 15 and wind around the cone or drum portion 3, thereby creating a left spiral
- the lift cords 5" enter from below through another lift cord guide channel 15 and wind around the cone or drum portion 2, thereby creating a right spiral.
- the tilting cords 6 enter the central section through tilt cord guide channels 16 and run in a V-shaped track between the two cone or drum portions 2, 3.
- the entrances of the two lift cord guide channels 15 in figure 4 are shown longitudinally displaced relative to each other and longitudinally symmetrically on either side of the entrances of the two tilt cord guide channels 16, it is also possible in another embodiment of the invention to form the lift cord guide channels 15 such that their entrances are located at the same longitudinal position and at the same longitudinal position as the entrances of the tilt cord guide channels. Thereby both lift and tilt cords will be located in a common transversal plane relative to the longitudinal axis of the mechanism and lift and tilt cords can thereby run along each other downwards from the head rail of the Venetian blind
- FIG. 5 shows the embodiment of figures 1 and 3(a) seen from above.
- the cone or drum portions 2, 3 can according to a specific embodiment each comprise a first cylindrical section 2, 3 and towards the central portion of the mechanism comprise a second section 2', 3' with increased diameter, upon which the lift cords 5 wind/unwind upon entering/leaving the guide channels 15 provided in the central guide bracket 4,
- the sections 2', 3' can be conical sections widening towards the central V-track, but the invention is not limited to conical sections 2', 3' and other geometries may also be used without thereby departing from the scope of the invention.
- a non-limiting number of such winding drum embodiments according to the present invention are shown with reference to figures 7(a) through 7(g) .
- Figure 7(a) shows an embodiment of a dual winding drum identical with that of figure 6 .
- the dual winding drum (2, 3) itself is shown and the cord 5 and cover 11 I have been omitted for clarity.
- figures 7(b) through 7(g) only show one of the two winding drums in the dual winding mechanism.
- the turns of the lift cord 5 wound upon the winding drum is schematically indicated in figures 7(b) through 7(g) .
- Figure 7(b) shows a purely cylindrical winding drum 21 towards the central portion provided with a shoulder 20 that pushes the turns of the lift cord 5 in the positive direction of the longitudinal axis X, i.e. towards the lift cord fixing point 22, when the lift cord is wound upon the drum.
- a cylindrical winding drum requires that the friction between the circumferential surface of the drum 21 and the lift cord 5 wound upon the drum be low over a certain longitudinal portion of the drum surface extending from the point 22 at which the cord is fixed to the drum and towards the central portion.
- Figure 7(c) shows a purely conical winding drum 23 that does not require the portion of low friction mentioned above for the cylindrical winding drum 21.
- the inclination angle of the cone must, however, be chosen within a proper interval dependent among others on the diameter and surface texture of the lift cord 5.
- the conical winding drum 23 approaches a cylindrical drum 21 and hence the requirement stated above will apply, whereas for an inclination angle above the said interval, the cord windings will tend to overlap each other upon winding of the cord on the drum, when the cord windings are pushed towards the cord fixing point 22, whereby the wound cord will easily become entangled, thus preventing proper operation of the lift mechanism.
- Figure 7(d) shows an embodiment of a winding drum according to the invention comprising a first substantially cylindrical portion 24 followed by a portion 25 of a hexagonal cross section comprising the surface sections 25 1 , 25 2 ,....25 6 , of which only 25 1 , 25 2 and 25 3 can be seen on the figure,
- the lift cord 5 is attached to the end of the hexagonal drum portion at the cord fixing point 22.
- this embodiment specifically comprises a hexagonal portion, this portion could alternatively exhibit other cross sectional shapes such as square, triangular etc
- the edge portions 26 located at the greatest distance from the longitudinal axis X of the winding drum could extend at a distance from the longitudinal axis X equal to the radius of the cylindrical portion 24, but it would also be possible to deviate from this dimension within certain limits, determined among others by the cord diameter.
- the said edge portions 26 may for instance be slightly rounded to reduce the risk of wear of the lift cord 5 passing over these edges 26.
- Figure 7(e) shows an alternative embodiment to the one shown in figure 7(d) , wherein the hexagonal portion is replaced by a cylindrical portion 27, in the circumferential surface of which there has been provided a planar longitudinally extending region 28, the surface of which is closer to the longitudinal axis X than corresponding to the radius of the first cylindrical portion 24.
- Figures 7(f) and 7(g) show two embodiments corresponding to those of figures 7(d) and 7(e) but with a conical first drum portion 29 instead of the cylindrical first drum portions 24 shown in figures 7(d) and 7(e) .
- Figures 7(h) and (i) show schematically cross sectional views through the non-cylindrical portions of the winding drum in order to more clearly illustrate the cross sectional shape of these embodiments.
- FIG 8 there is schematically indicated an alternative embodiment of the invention (seen from above) comprising a pair of winding drums 30, 31 (here cylindrical drums are chosen, but any other embodiment of winding drums according to the invention could also have been used) placed parallel to each other and driven via meshing gear wheels 32 by a common drive motor 33.
- Two separate drive motors could also have been used as an alternative. Using this configuration, the two lift cords of a given pair of lift cords can easily be located at the same longitudinal position along the slats.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Blinds (AREA)
Description
- The present invention relates generally to lift mechanisms for Venetian blinds and more specifically to such mechanisms designed for Venetian blinds, in which pairs of lift cords are used.
- A substantial number of lift mechanisms for Venetian blinds are known within the art Many of these mechanisms are designed for Venetian blinds, where the raising and lowering of the slats of the Venetian blind are accomplished with a number of single lift cords passed from the mechanism mounted in the head rail of the Venetian blind and through openings in the individual slats to the bottom rail of the Venetian blind.
- Furthermore, a number of Venetian blinds applying pairs of lift cords is known within the art. This solution has among others the advantage that the lift cords do not have to be passed through openings provided in the individual slats, and hence the individual slats can be left without through openings, which is advantageous from the point of view of blocking light passage through the Venetian blind. Another major advantage is obtained with this lift system in that the individual slats can be removed from the Venetian blind without the necessity of dismantling the whole Venetian blind. This is of considerable importance both in case of replacement of individual slats in case of damage to these and when slats have to be cleaned.
- In some known lift mechanisms for pairs of lift cords, the two lift cords of each given pair are both wound helically on a single drum. However, this solution can be problematic as the two separate lift cords of a given pair of lift cords may get entangled, especially when the lift mechanism is used in Venetian blinds comprising very lightweight slats. It is hence desirable to provide an improved and yet simple lift mechanism for a Venetian blind comprising lightweight slats, which mechanism offers a reliable operation without the risk of the lift cords becoming entangled.
US 2007/144686 discloses a threaded lift cord spool system including a pair of cord spools, each associated with a lift cord. - The above objective is according to the present invention attained by a lift mechanism as defined in claim 1 including the provision of a separate winding drum (which can be for instance of a a cylindrical or conical shape) for each lift cord of a given pair of lift cords.
- According to a first specific embodiment, the above principle of the invention is implemented as a double cone (or drum) lift mechanism comprising a central portion containing guide means for the lift cords directing the two lift cords of a given pair of lift cords from the circumferential surface of said cone or drum downwards towards the slats and/or bottom rail of the Venetian blind. According to one specific embodiment, a central portion of the mechanism also comprises the tilt mechanism for the Venetian blind.
- According to still another embodiment, one or more tilt mechanisms may alternatively be provided separately from the lift mechanism.
- According to another specific embodiment, the principle of the invention is implemented by separate winding drums placed alongside each other, i.e, with individual longitudinal axes extending substantially in parallel with each other.
- Other arrangements of the separate winding drums may, however, also be provided without departing from the scope of the invention, as defined by the appended claims.
- According to said first embodiment, longitudinally on either side of said central portion the two lifting cone or drum portions are extending, one for each of the lift cords of the given pair of lift cords. When these cone or drum portions are rotated, for instance by a drive shaft extending through and in engagement with the cone or drum portions, the respective lift cords of the pair of lift cords become helically wound on or off the respective cone or drum portions.
- According to a preferred embodiment of the mechanism according to the present invention, at least a part of the outer circumferential surface of the cone or drum portions is covered by a cover part, preferably of such a curvature that a uniform gap is created between the outer circumferential surface of the respective cone or drum portion and the adjacent surface of the cover, such that the lift cord when wound on the cone or drum portion is confined within this gap, thereby preventing entanglement of the helical windings of the lift cord on the surface of the cone or drum portion. The width of this gap can either be somewhat greater than or equal to the diameter of the lift cords. It is, however, also possible to use a width of the gap somewhat less than the cord diameter, which will have the beneficial effect of forcing the lift cord out of the winding mechanism, such that a reliable operation of the winding mechanism can be ascertained for instance when very lightweight slats are used in the Venetian blind.
- According to the invention, there is thus provided a lift mechanism for a Venetian blind, Venetian blind, the lift mechanism comprising two cone or drum portions, upon an outer circumferential surface of one of these portions one lift cord of a given pair of lift cords is wound upon rotation in a first direction of the drum portion and from which the lift cord is unwound upon rotation in an opposite second direction of the drum portion, and upon an outer circumferential surface of the other cone or drum portion, the other lift cord of a given pair of lift cords is wound upon rotation in said first direction of this other drum portion and from which the lift cord is unwound upon rotation in said opposite second direction of this as defined in claim 1.
- According to a specific embodiment of the invention, the lift cords pass through lift cord guide channels extending substantially tangentially to the corresponding outer circumferential surface of each respective cone or drum portion.
- According to a preferred embodiment, the two cone or drum portions are provided coaxially with each other.
- In addition to the lift mechanism as such, the present invention also relates to the winding drums used for winding the lift cords of the Venetian blind. Such winding drums can comprise either one or more outer circumferential surface portions, upon which the lift cord is wound and the cross sections of these one or more winding portions of the total winding drum can according to various embodiments of the present invention assume different shapes.
- Thus, according to one embodiment of a lift mechanism according to the present invention, cone or drum winding portions of the mechanism comprise a first drum portion upon which the lift cord is wound or from which it is unwound and a second drum portion extending longitudinally from the first drum portion, to which second drum portion the lift cord is attached, wherein the first drum portion is substantially cylindrical or conical and where the cross sectional shape of the second portion is such that the circumference of the cross section of the second portion is less than the circumference of the first drum portion.
- According to one embodiment, the second drum portion has a cross section, whose boundary is piecewise linear.
- According to another embodiment, the boundary of the cross section of the second drum portion comprises curved portions.
- According to a specific embodiment, the cross sectional shape of the second drum portion is hexagonal, triangular, square or formed as an asterisk.
- According to still another specific embodiment, the cross section of the second drum portion is circular over one or more angular sections θi and non-circular over one or more other angular sections ϕj.
- The maximum radial extension of the first and second drum portions may be equal to each other, but it would also be possible to provide first and second portions with different maximum radial extension without departing from the scope of the invention.
- Although the present specification focuses on a dual drum mechanism for winding two lift cords in a Venetian blind, it is understood that a single drum according to the invention can be used alone, for instance in Venetian blinds comprising a number of single lift cords passed through apertures in the slats between a head rail containing the winding mechanisms and either the lowermost slat or a bottom rail of the Venetian blind.
- The present invention will be better understood with reference to the following detailed description of an embodiment of the invention and to the figures, where:
-
Figure 1 shows a schematic perspective view of an embodiment of the lift mechanism according to the invention; -
Figure 2 shows an exploded view of the embodiment of the invention shown infigure 1 ; -
Figure 3(a) shows a plane side view of the embodiment offigure 1 ; -
Figure 3(b) shows a cross sectional view along section A ― A as indicated infigure 3(a) ; -
Figure 3(c) shows a plane view of the embodiment offigures 1 and3(a) seen from one longitudinal end; -
Figure 4 shows the embodiment offigures 1 and3(a) seen from below along section B ― B as indicated infigure 3(a) ; -
Figure 5 shows the embodiment offigures 1 and3(a) seen from above; -
Figure 6 shows a cross sectional view through the embodiment offigure 5 along the section C ― C as indicated infigure 5 ; -
Figures 7(a) through 7(i) show different embodiments of a winding drum according to the invention; and -
Figure 8 shows an alternative embodiment of the invention comprising a pair of winding drums placed parallel to each other and driven by a common drive motor. - With reference to the drawings,
figure 1 shows a schematic perspective view of an embodiment of the lift mechanism according to the invention. The mechanism is generally designated by reference numeral 1 and comprises two cylindrical cone ordrum portions figure 1 ) of a central portion that comprises a guide bracket 4 for the cone or drum portions and atrack 10 for accommodating thetilt cords 6 of the Venetian blind. The cone ordrum portions end caps 12 at either longitudinal end of the mechanism 1. Extending above (as seen onfigure 1 ) portions of the cone ordrum portions cover 11 is provided, the curvature of which substantially corresponds to that of the cone or drum portions such that a gap of substantially uniform width in the radial direction is created between the outer circumferential surface of those portions of the cone or drum portions that are covered by thecover 11. The radial width of this gap corresponds substantially to the diameter of thelift cords 5 so that the lift cords, when wound on the cone ordrum portions - The
lift cords 5 are wound helically on/off the cone ordrum portions drum portions central portion 4, 10, there is provided guide means, for instance formed aschannels 15, 16 (seefigure 4 ), leading thelift cords 5 and thetilt cords 6 towards theslats 7 of the Venetian blind. The cone ordrum portions - The details of the mechanism I are more clearly visible in the exploded view of the embodiment of the invention shown in
figure 2 . Theupper cover part 11 is when the mechanism 1 is assembled, snap-fitted to the guide bracket 4 by engagement of radiallyresilient tongues 17 on the cover part and mating retainment means 18 on the guide bracket 4. - With reference to
figure 3(a) , there is shown a plane side view of the embodiment offigure 1 .Figure 3(b) is a cross sectional view along section A ― A as indicated infigure 3(a) showing the provision of thetilt cord 6 around the middle section connecting the two cone ordrum portions Figure 3(c) further shows a plane view of the embodiment offigures 1 and3(a) seen from one longitudinal end hereof - With reference to
figure 4 , there is shown the embodiment offigures 1 and3(a) seen from below, i.e. from the slats of the Venetian blind, along section B ― B as indicated infigure 3(a) . As indicated infigure 4 , the lift cords 5' enter from below through a liftcord guide channel 15 and wind around the cone ordrum portion 3, thereby creating a left spiral and thelift cords 5" enter from below through another liftcord guide channel 15 and wind around the cone ordrum portion 2, thereby creating a right spiral. Thetilting cords 6 enter the central section through tiltcord guide channels 16 and run in a V-shaped track between the two cone ordrum portions - Although the entrances of the two lift
cord guide channels 15 infigure 4 are shown longitudinally displaced relative to each other and longitudinally symmetrically on either side of the entrances of the two tiltcord guide channels 16, it is also possible in another embodiment of the invention to form the liftcord guide channels 15 such that their entrances are located at the same longitudinal position and at the same longitudinal position as the entrances of the tilt cord guide channels. Thereby both lift and tilt cords will be located in a common transversal plane relative to the longitudinal axis of the mechanism and lift and tilt cords can thereby run along each other downwards from the head rail of the Venetian blind -
Figure 5 shows the embodiment offigures 1 and3(a) seen from above. - With reference to
figure 6 , there is shown a cross sectional view through the embodiment offigure 5 along the section C ― C as indicated infigure 5 , As it appears fromfigure 6 , the cone ordrum portions cylindrical section lift cords 5 wind/unwind upon entering/leaving theguide channels 15 provided in the central guide bracket 4, The sections 2', 3' can be conical sections widening towards the central V-track, but the invention is not limited to conical sections 2', 3' and other geometries may also be used without thereby departing from the scope of the invention. A non-limiting number of such winding drum embodiments according to the present invention are shown with reference tofigures 7(a) through 7(g) . -
Figure 7(a) shows an embodiment of a dual winding drum identical with that offigure 6 . Infigure 7(a) only the dual winding drum (2, 3) itself is shown and thecord 5 and cover 11 I have been omitted for clarity. Furthermore,figures 7(b) through 7(g) only show one of the two winding drums in the dual winding mechanism. The turns of thelift cord 5 wound upon the winding drum is schematically indicated infigures 7(b) through 7(g) . -
Figure 7(b) shows a purely cylindrical windingdrum 21 towards the central portion provided with ashoulder 20 that pushes the turns of thelift cord 5 in the positive direction of the longitudinal axis X, i.e. towards the liftcord fixing point 22, when the lift cord is wound upon the drum. A cylindrical winding drum requires that the friction between the circumferential surface of thedrum 21 and thelift cord 5 wound upon the drum be low over a certain longitudinal portion of the drum surface extending from thepoint 22 at which the cord is fixed to the drum and towards the central portion. - Although the embodiments of winding drums according to the invention shown in
figures 7(a) through 7(g) are all provided with theshoulder 20, the effect of pushing the turns of the lift cord towards the fixingpoint 22 should alternatively have been provided by using the end faces 19 of the retainment means 18 on the guide bracket 4 shown infig. 2 as abutment means for the lift cord. -
Figure 7(c) shows a purely conical windingdrum 23 that does not require the portion of low friction mentioned above for the cylindrical windingdrum 21. The inclination angle of the cone must, however, be chosen within a proper interval dependent among others on the diameter and surface texture of thelift cord 5. For an inclination angle below this interval, theconical winding drum 23 approaches acylindrical drum 21 and hence the requirement stated above will apply, whereas for an inclination angle above the said interval, the cord windings will tend to overlap each other upon winding of the cord on the drum, when the cord windings are pushed towards thecord fixing point 22, whereby the wound cord will easily become entangled, thus preventing proper operation of the lift mechanism. - Although able to function, given the above mentioned requirements are fulfilled, the above two embodiments of winding drums according to the invention may suffer from the problems described above if the requirements relating to surface smoothness and inclination angle as set forth above are not fulfilled. Such potential problems will be solved by the embodiments of winding drums according to the invention illustrated in
figures 7(d) through 7(g) . -
Figure 7(d) shows an embodiment of a winding drum according to the invention comprising a first substantiallycylindrical portion 24 followed by aportion 25 of a hexagonal cross section comprising thesurface sections lift cord 5 is attached to the end of the hexagonal drum portion at thecord fixing point 22. Although this embodiment specifically comprises a hexagonal portion, this portion could alternatively exhibit other cross sectional shapes such as square, triangular etc Theedge portions 26 located at the greatest distance from the longitudinal axis X of the winding drum could extend at a distance from the longitudinal axis X equal to the radius of thecylindrical portion 24, but it would also be possible to deviate from this dimension within certain limits, determined among others by the cord diameter. Furthermore, the saidedge portions 26 may for instance be slightly rounded to reduce the risk of wear of thelift cord 5 passing over theseedges 26. -
Figure 7(e) shows an alternative embodiment to the one shown infigure 7(d) , wherein the hexagonal portion is replaced by acylindrical portion 27, in the circumferential surface of which there has been provided a planarlongitudinally extending region 28, the surface of which is closer to the longitudinal axis X than corresponding to the radius of the firstcylindrical portion 24. -
Figures 7(f) and 7(g) , respectively, show two embodiments corresponding to those offigures 7(d) and 7(e) but with a conicalfirst drum portion 29 instead of the cylindricalfirst drum portions 24 shown infigures 7(d) and 7(e) . -
Figures 7(h) and (i) show schematically cross sectional views through the non-cylindrical portions of the winding drum in order to more clearly illustrate the cross sectional shape of these embodiments. - Referring to
figure 8 , there is schematically indicated an alternative embodiment of the invention (seen from above) comprising a pair of windingdrums 30, 31 (here cylindrical drums are chosen, but any other embodiment of winding drums according to the invention could also have been used) placed parallel to each other and driven viameshing gear wheels 32 by acommon drive motor 33. Two separate drive motors could also have been used as an alternative. Using this configuration, the two lift cords of a given pair of lift cords can easily be located at the same longitudinal position along the slats.
Claims (15)
- A lift mechanism for a Venetian blind, where the Venetian blind comprises pairs of lift cords (5) for raising or lowering the slats (7) of the Venetian blind, the lift mechanism comprising two cone or drum portions (2, 3), upon an outer circumferential surface of one (2) of these portions one lift cord of a given pair of lift cords is wound upon rotation in a first direction of the drum portion (2) and from which the lift cord is unwound upon rotation in an opposite second direction of the drum portion (2), and upon an outer circumferential surface of the other (3) cone or drum portion, the other lift cord of a given pair of lift cords is wound upon rotation in said first direction of this other drum portion (3) and from which the lift cord is unwound upon rotation in said opposite second direction of this drum portion (3) wherein said two cone or drum portions (2, 3) are connected through a central connection, such that they rotate with each other, characterised in that there is provided central portion (10), in which tilt cords (6) are operatively coupled to said central connection.
- A lift mechanism according to claim I, in which said lift cords (5) pass through lift cord guide channels (15) extending substantially tangentially to the corresponding outer circumferential surface of each respective cone or drum portion (2, 3).
- A lift mechanism according to claim 1 or 2, in which said two cone or drum portions (2, 3) are provided coaxially with each other. (10), in which tilt cords (6) are operatively coupled to said central connection.
- A lift mechanism according to any of the preceding claim, in which at least a portion of the outer circumferential surface of the cone or drum portions (2, 3) is covered by a cover (11), thereby forming a radial gap between the cover and the outer circumferential surface of the cone or drum portions, through which gap the respective lift cord (5) passes.
- A lift mechanism according to claim 4, wherein the width of said gap is substantially equal to the diameter of said lift cord (5).
- A lift mechanism according to claim 4, wherein the width of said gap is less than the diameter of said lift cord (5).
- A lift mechanism according to claim 1, wherein said cone or drum portions are substantially cylindrical.
- A lift mechanism according to claim 1, wherein said cone or drum portions are conical.
- A lift mechanism according to claim 1, wherein said cone or drum portions comprise a first drum portion upon which the lift cord is wound or from which it is unwound and a second drum portion extending longitudinally from the first drum portion, to which second drum portion the lift cord is attached, wherein the first drum portion is substantially cylindrical or conical and where the cross sectional shape of the second drum portion is such that the circumference of the cross section is less than the circumference of the cylindrical portion.
- A lift mechanism according to claim 9, wherein the second drum portion has a cross section, whose boundary is piecewise linear.
- A lift mechanism according to claim 9, wherein the boundary of the cross section of the second drum portion comprises curved portions.
- A lift mechanism according to claim 9 or 10, wherein said cross sectional shape is hexagonal, triangular, square or formed as an asterisk.
- A lift mechanism according to claim 9, wherein the cross section of the second drum portion is circular over one or more angular sections θi and non-circular over one or more other angular sections ϕj.
- A lift mechanism according to any of the preceding claims, wherein said cone or drum portions are provided with a shoulder portion (20) substantially at the longitudinal end of the cone or drum portion where the lift cord is wound on/off the cone or drum portion from the slats (7), by means of which shoulder portion (20) the turns of the lift cord are pushed in the direction away from the shoulder portion (20) when the lift cord is wound upon the cone or drum portion (2,3).
- A lift mechanism according to any of the preceding claims, wherein an end face (19) of a retainment means (18) on a guide bracket (4) acts as abutment means for pushing the turns of the lift cord in the direction away from the face (19), when the lift cord is wound upon the cone or drum portion (2, 3).
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11707658A EP2545240A2 (en) | 2010-03-10 | 2011-03-08 | A flexible venetian blind |
JP2012556482A JP5814273B2 (en) | 2010-03-10 | 2011-03-08 | Flexible Venetian blind |
CN201510445854.5A CN105178832B (en) | 2010-03-10 | 2011-03-08 | Hoisting mechanism and venetian blinds for venetian blinds |
US13/583,791 US20130048234A1 (en) | 2010-03-10 | 2011-03-08 | Dual drum lift mechanism for venetian blinds |
PCT/EP2011/053443 WO2011110544A2 (en) | 2010-03-10 | 2011-03-08 | A flexible venetian blind |
RU2012142544/12A RU2571030C2 (en) | 2010-03-10 | 2011-03-08 | Louvres |
CN201180013291.2A CN102884270B (en) | 2010-03-10 | 2011-03-08 | Flexible venetian blind |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA201000196 | 2010-03-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2369120A1 EP2369120A1 (en) | 2011-09-28 |
EP2369120B1 true EP2369120B1 (en) | 2015-03-11 |
EP2369120B9 EP2369120B9 (en) | 2015-05-13 |
Family
ID=44140912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20100173684 Active EP2369120B9 (en) | 2010-03-10 | 2010-08-23 | Dual drum lift mechanism for venetian blinds |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2369120B9 (en) |
DK (1) | DK2369120T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN215974326U (en) * | 2021-06-25 | 2022-03-08 | 东莞市雷富溢窗饰科技有限公司 | Curtain winding device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH672658A5 (en) * | 1986-07-31 | 1989-12-15 | Storenstoff Ag | Drum for raising and lowering venetian blind - using two part drum which pulls down as well as up |
US7520311B2 (en) * | 2005-12-22 | 2009-04-21 | Hunter Douglas Inc. | Threaded lift cord spool for coverings for architectural openings |
DE102007004719B4 (en) * | 2007-01-31 | 2018-04-05 | Mhz Hachtel Gmbh & Co. Kg | Method for mounting a winding arrangement of a blind |
EP1990500A1 (en) * | 2007-05-11 | 2008-11-12 | Cheou, Si-Chuan | Cord seat assembly |
-
2010
- 2010-08-23 EP EP20100173684 patent/EP2369120B9/en active Active
- 2010-08-23 DK DK10173684.1T patent/DK2369120T3/en active
Also Published As
Publication number | Publication date |
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EP2369120B9 (en) | 2015-05-13 |
EP2369120A1 (en) | 2011-09-28 |
DK2369120T3 (en) | 2015-06-01 |
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