SE2051065A1 - Screen device comprising a turnable knob for expanding or retracting the device - Google Patents

Abstract

A screen device (1) comprises a sheet of material (3) and expanding means (5) for unfolding the material (3). The expanding means (5) has at least one at least partially expanded state and one fully retracted state, wherein the expanding means comprises a plurality of ribs (5) extending from a central hub (2) to the periphery (4) of the sheet (3). The central hub (2) comprises a knob which actuates a motion of the ribs (5) by a turning motion of the knob.

Description

SCREEN DEVICE Field of the invention The present invention relates to a screen device comprising a sheet ofmaterial and expanding means for unfolding the sheet, the expanding means havingat least one at least partially expanded state and one fully retracted state.

BackgroundSeveral devices acting as screens or protectors are generally known. Often such devices are foldable or collapsible so that they are easy to store when they arenotneeded.

There are curtains, umbrellas for rain or sunshine, blinds for windows, shadingscreens for cars, etc. Their efficiency to block sunlight and peeping may vary, as wellas their visual appeal. ln some cases, they may be laborious and time-consuming toinstall and unfold. Also due to their size and actuation, they may not be suitable forinstallation in all places.

SummaryThe objective of the present invention is to solve, or at least mitigate, parts or all of the above mentioned problems. To this end, there is provided a screen devicewherein the expanding means are a plurality of ribs extending from a central hub tothe periphery of the sheet, and the central hub comprises a knob which actuates amotion of the ribs by a turning motion of the knob.

As such, a screen device may be obtained which is easily and intuitivelyoperated to form different states with different expansions to either increase ordecrease the area of coverage. ln a further embodiment, the ribs are attached at their inner ends to a reelinside the central hub, and their outer ends are attached to the sheet.

The ribs have one fully retracted state, one fully extended state and possiblyone or a plurality of partially extended states. Hereby the expansion of the ribs andthe amount of coverage of the sheet of material may be varied according to the user's wishes. ln a still further embodiment, the reel inside the central hub is connected to theknob and is arranged to be rotated when the knob is turned.

Hereby only a limited motion needs to be performed in order to operate theactuating device and attain a partly or fully expanded state of the ribs and the sheet of material. ln another embodiment the distance from outer ends of the ribs to the centralhub is varied, when the knob is rotated.

Hereby the extension of the ribs and the amount of coverage provided by thesheet of material may also be varied according to the users' wishes, allowing thescreen device to be adapted to the space available, and the screen device may beplaced in areas where only a limited space is available. There is no need to removethe screen device from its original position in order to expand or retract it. ln a further embodiment, the ribs are guided in slits in a cylindrical drum surrounding the reel.

Hereby the ribs are kept in their respective, intended positions in the screendevice, ensuring a reliable function of the screen device even after extended periods of use. ln an even further embodiment the ribs are arranged to extend to one or more at least partially extended states in a direction tangential to the cylindrical drum.

Hereby the screen device may expand symmetrically or at least into a regularshape. On retraction to a less expanded state, the direction of the ribs may also betangential. ln a still further embodiment, the inner portions of the ribs closest to the innerends of the ribs are arranged to be wound around the reel, inside the cylindricaldrum, in the at least one partially expanded state and the fully retracted state of theribs.

Hereby the screen device may retain parts of the expanding means in aretracted state, thereby efficiently limiting the need for space around the screen device during use and operation of the screen device. Also, the size of the expandedscreen device may be adapted to the space available. ln a further embodiment, each rib has a profiled section and a concave side isarranged to face a direction towards the ree|.

Hereby winding the ribs around the ree| may be as easy as possible, since theribs may bend most easily in this direction, and extend into a straight position, whenthey are extracted. By the bending in the concave direction, the ribs are allowed towind up in this direction, when they are partially extended or retracted. The outerportions of the ribs are allowed to extend into a straight position when they areextended from the hub. The opposite side of the rib may be a convex side, facing theopposite direction, i. e. the direction towards the cylindrical drum in the hub. ln an embodiment, the ree| is provided with a profiled, radially extending indexring, facing a profiled, radially extending ring in the cylindrical drum, whereby anumber of discrete, mutual turning positions, corresponding to partially extendedstates of the ribs, are defined.

Hereby may be obtained a number of discrete, partly expanded states as wellas one fully retracted state and one fully expanded state. The screen device maytend to remain in any discrete state, until the knob is operated again. Hence theremay be no immediate need for a separate locking device for keeping the screendevice in its attained state. ln a further embodiment each of the profiled index rings comprises a profiledsurface with a periodically varying thickness in the circumferential direction, and theprofiled surfaces are arranged to abut one another with a friction engagement.

Hereby may be obtained, by interaction between the profiled rings, aninclination of the actuating device to attain certain distinct positions, while there maybe a reluctance against moving out of such positions once attained. A certain forcemay be needed to move out of an attained position. The respective profiles may beadapted to one another, so that discrete rotational positions are formed, which theree| may tend to attain, and wherein the ree| may tend to remain until furtheroperation. The tendency to remain in an attained state limits the transfer to neighbouring states to such a degree that the screen device will remain in its presentposition until the knob is turned intentionally. ln another embodiment the sheet of material is attached to the hub at a centralportion of the material and to the ribs at the outer edge of the material.

Hereby the sheet material may attain an attractive folded shape in partiallyexpanded states and in the fully retracted state, as well as a smooth shape in thefully expanded state. Depending on the number and the length of the fully extendedribs, the fully expanded state of the sheet material may be non-polygonal orpolygonal, having any number of shapes and sides e.g. being triangular, square,rectangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal,decagonal or nearly circular. The sheet material may be attached to different parts ofthe hub in different embodiments, e. g. to the reel or to the cylindrical drum. ln an embodiment the sheet of material comprises one or more materialsselected from a group including a woven textile fabric, a knitted textile fabric, a non- woven material, a plastic material, an organic material, and a paper-based material.

Hereby the screen device may be provided with one or more desiredproperties for various uses, and various available, possibly recycled, materials maybe used. ln one embodiment the sheet of material includes a sound absorbing material.

Hereby the screen device may be suitable for use in various environmentswhere a sound-dampening effect may be desired, such as in schools, offices, dininghalls, etc. ln another embodiment the sheet of material includes a light-reflecting material.

Hereby the screen device may be suitable for use in various environmentswhere light reflecting properties may be desired, such as in dark premises, roomswithout windows, photo studios, etc. ln yet another embodiment the sheet of material includes a waterproof material.

Hereby the screen device may be suitable for use under varying conditions,e.g. outdoors, in humid or wet environments such as close to swimming pools, industy environments where frequent washing may be needed, etc. ln still another embodiment the hub is connected to a holding device.

Providing the screen device with a holding device may make it more useful forvarious purposes, such as sun-shading screens, privacy screens, sound dampeningetc, so that the screen device may be positioned at a suitable place and angle. ln a further embodiment the holding device is at least one from a groupincluding a suction cup, a lamp fitter, an umbrella handle, a rod, a stand, or a tripod.

A number of possible holding devices imply possible, but not limiting, uses for the screen device. ln a still further embodiment, the knob is connected via a bolt to a suction cup.

Hereby the attachment of the screen device to a smooth surface, such as awindow pane, may be possible by actuation of the suction cup on an axial motion ofthe knob. ln another embodiment the cylindrical drum is connected via a bolt to a suctioncup.

Hereby another alternative for actuating the suction cup on an axial motion ofthe cylindrical drum is presented. lt is noted that embodiments of the invention may be embodied by all possiblecombinations of features recited in the claims. Further, it will be appreciated that the various embodiments described for the device are all combinable.Brief description of the drawinqs The above, as well as additional objects, features and advantages of thepresent invention, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, withreference to the appended drawings, where the same reference numerals will be used for similar elements, wherein: is a diagrammatic planar view of one embodiment of ascreen device according to the disclosure in a fullyexpanded state; is a diagrammatic view in perspective of the screen device in fig. 1a;is a side view of the device according to Figs. 1a and 1b; is a view according to Fig. 1a of the device in a fullyretracted state; is a diagrammatic view in perspective of the screen device in fig. 2a;is a side view of the device according to Figs. 2a and 2b; is an exploded side view of the screen device in its fullyexpanded state; is an exploded view in perspective of the disclosed device;is an enlargement of a section A of Fig. 4a;is a partially sectional view of the disclosed device; and is a partially sectional side view of the device.

All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate the embodiments, wherein other parts may be omitted.

Detailed description of the exemplarv embodiments Fig. 1a illustrates a screen device 1 according to the present disclosure in a fully expanded state, i. e. a state wherein it may provide a maximum amount of shade, protection against unwanted observation etc. ln the central region of the screen device 1 there is a hub 2, from which expanding means (not shown in Fig. 1a) extend outwards to unfold a sheet of 6 material 3 into the fully extended state. The expanding means are attached at theouter edge 4 of the sheet of material 3, thereby providing the screen device 1 with a polygonal shape.

Depending on the number of expanding means, the screen device 1 disc|osedin Fig. 1a may be perceived as approximately circular. The number of expandingmeans may be reduced or increased, and the shape of the screen may be affectedhereby. The resulting screen device 1 may be hexagonal, octagonal, or anypolygonal shape. Also, the expanding means may be ofdifferent lengths, andarranged at different mutual angles, and the resulting screen device may be rectangular, square, etc. ln Fig. 1b the screen device 1 is shown in perspective from its reverse side.The hub 2 extends a certain distance in a direction away from the sheet of material 3.A number of ribs 5, which work as expanding means, are visible in the view of Fig.1b. The ribs 5 extend from the hub 2 to the outer edge 4 of the sheet of material 3,spaced at approximately equal distances around the circumference of the hub 2. Asseen in Fig. 1b, they are not arranged at right angles to the envelope surface of thehub 2, and do hence not extend radially, but rather as tangents to the envelopesurface of the hub 2.

Fig. 1c discloses the screen device 1 in a side view. ln this drawing, it may beseen that the hub 2 extends some distance away from the sheet of material 3 in bothdirections therefrom. A knob 6, which is turnable as well as depressable, projectsfrom the hub 2. ln a preferred embodiment, the knob 6 acts as an actuator forattaching the screen device 1 to a surface as well as for extending and retracting theribs 5.

Fig. 2a discloses the screen device 1 from the same direction as in Fig. 1a.The ribs 5 have been retracted maximally into the hub 2. Hereby the outer edges 4 ofthe sheet of material 3 have been retracted to a position closer to the hub 2. Thesheet of material 3 has been neatly folded and slightly twisted, when the ribs 5 havebeen retracted tangentially into the hub 2.

Fig. 2b discloses the screen device 1 from the same direction as in Fig. 1b.

The ribs 5 have been retracted approximately tangentially into the hub 2, and the 7 outer edge 4 of the sheet of material 3 has now adopted a general wave-form aroundthe hub 2. The outer ends of the ribs 5 coincide with the flutes of the waves, while thetroughs are arranged in the spaces between the ribs 5.

The maximally retracted screen device 1 is shown in a side view in Fig. 2c.The folds in the sheet of material 3 extend into a slightly raised position, as comparedto the fully extended state in Fig. 1c, thereby concealing the hub 2 and the knob 6from view. Since the sheet of material 3 is not retracted into the hub 2, but remains infolds outside of the hub 2, the ribs 5 may not be completely retracted into the hub 2.Still, the state in Fig. 2c represents the fully retracted state, since it is not possible to retract neither the ribs 5 nor the sheet of material 3 any further.

The parts comprised in the screen device 1 are disclosed in Fig. 3 in anexploded view, which may illustrate most of the parts included in the screen device 1,and how they are connected to one another, although the mutual positions shown,and needed for assembling the parts, may not be the positions they occupy in themounted state of the device 1. ln the hub 2, at the core of the screen device 1, there is an upper 7a and alower 7b part of a coil or reel 7, whereon the inner ends of the ribs 5 may beattached. The coil or reel 7 is preferably enclosed in a drum 8, which also comprisestwo parts 8a, 8b. ln the embodiment disclosed in Fig. 3, a number of pins 9 arearranged, preferably at equal distances, around the circumference of each of theparts 7a, 7b of the reel 7. When the upper 7a and lower 7b parts of the reel 7 aremounted, the pins 9 on the respective halves are preferably arranged in register withone another, so that they form mutually aligned pairs, and the inner ends of the ribs 5may be attached thereto. Hereby one pin 9 on the upper part 7a of the reel 7 mayconnect to the same rib 5 as one pin 9 on the lower part 7b of the reel 7. Each rib 5may hereby be stabilized by two connection points with the reel 7, and any tendencies of the ribs 5 to swerve in an axial direction of the reel 7 may be reduced.

As mentioned above, the reel 7 is arranged in a drum 8. The drum 8 may beprovided with a number of openings or slits 10 in the drum 8, preferablycorresponding to the number of pins 9 on each half 7a, 7b on the reel 7, and to the number of ribs 5. ln the disclosed embodiment, the slits 10 are arranged in the upper half 8a of the drum 8. ln a mounted state, the two halves 7a, 7b of the reel 7 areassembled to form a single part 7, and the inner ends of the ribs 5 are attached to thepairs of pins 9. Each rib 5 is arranged to extend through a slit 10 in the drum 8.

The ribs 5 are arranged to be easily bendable across their longitudinaldirection, so that they may fold around the reel 7 in the center of the hub 2. They aredesigned with a concave section, so that they will be stiff in their transversaldirection, as needed to keep the sheet of material 3 in the screen device 1 in anexpanded state. Also, the concave section may make them less bendable in adirection opposite to the direction where they are the most bendable. Each ribpreferably has a profiled section with a concave side and a convex side, where theconcave side is arranged to face a direction towards the reel inside the central huband the convex side is arranged to face a direction towards the cylindrical druminside the central hub.

On rotation of the reel 7 relative to the encasing drum 8 the ribs 5 are eitherexpanded or retracted through the slits 10, depending on the direction of rotation.When the ribs 5 are retracted, the inner parts of the ribs are wound or curled aroundthe reel 7. As the pairs of pins 9, whereon the ribs 5 are attached may be arranged atfairly short mutual distances, i. e. distances that may be smaller than the desiredretraction of the ribs 5, the curled parts of the ribs 5 may be layered on one anotheraround the reel. Thereby may be formed a nested, space-saving arrangement of ribs5 inside the drum 8. The curling of the ribs 5 around the reel 7 may also have theeffect that the parts of the ribs 5 that extend outside the drum 8 attain a positionwhere they extend approximately tangentially to the drum 8 at their respective slits10.

The outer ends of the ribs 5 are not fully retracted inside the drum 8, since thesheet of material 3 attached to the ribs 5, may be gradually folded outside the drum8. At least the outer ends of the ribs 5 may be attached to the outer edge 4 of thesheet of material 3. The maximally retracted position of the ribs 5 correspond to thefolded arrangement of the screen device 1 shown in Figs. 2a-2c.

When the ribs 5 are expanded from the drum 8, i. e. on rotation in a reverse direction as compared to the retraction of the ribs 5, the nested ribs 5 that are curled around the reel 7 gradually expand through the slits 10 in the drum. Like when theyare retracted, the ribs 5 extend from the drum 8 in a tangential direction at their exitpoints through the slits 10. The maximally expanded position of the ribs 5 is disclosedin Fig. 1b. ln order to control the retraction and the extension of the ribs 5, the discloseddevice comprises two indexing rings 11a (Fig. 3), 11b (Fig. 4). The first indexing ring11a may be arranged at the bottom of the lower half of the reel 7, as seen in Fig. 3.The indexing ring 11a may be formed integrally with the reel 7. The indexing ring 11amay have a profiled surface, which faces the bottom of the surrounding drum 8. Theprofiled surface comprises elevated regions as well as depressed regions, which arearranged periodically around the indexing ring 11a.

The second indexing ring 11b, facing the first indexing ring 11a in the mountedposition, may be arranged at the bottom half 8b of the drum 8, as seen e. g. in fig. 4.The profiled surface comprises elevated and depressed regions, similar to theprofiled surface of the first indexing ring 11a. The profiled surfaces of the twoindexing rings 11a 11b are arranged to mate with one another reasonably well, sothat they may be arranged at a number of mutual resting positions, which correspondto discrete degrees of expansion of the ribs 5. The indexing rings 11a, 11b are insuch mutual contact that there is a friction between their profiled surfaces. ln the discrete resting positions, an elevated region on one of the rings 11a,11b is arranged more or less in contact with a depressed region on the other ring11a, 11b. A certain amount of force, applied in a turning direction, may be needed tobring the indexing rings 11a, 11b from one mutual resting position to the next, andthe indexing rings 11a, 11b may have a tendency to remain in each attained restingposition, until a further force is applied again. The applied force may be needed toimpel the rings 11a, 11b past a mutual position where two elevated regions are incontact with one another, into the next resting position. ln this way, the ribs 5 mayattain a number of partially expanded states between the fully retracted state and thefully expanded state. The ribs 5 may remain in their current state, until a turning forceis applied on the reel 7 relative to the drum 8, and each state of the screen device 1is hence selectable by the user, and the user can expect the screen device 1 toremain in this selected state.

As mentioned above, the ree| 7 needs to be turned relative to the drum 8 inorder to change the state of the ribs 5. The knob 6 has been mentioned above as anactuator for the screen device 1 when it is twisted. ln order to effect this, the knob 6 isprovided with a circumferential flange 12 at one end of the knob 6. The knob isarranged to extend through a central opening at one end of the ree| 7. The mainportion of the knob 6 may fit snugly in the opening and extend outside of the ree| 7 inits Iongitudinal direction. lt may also extend through a central hole in the drum 8 andform a central part of the hub 2. However, the circumferential flange 12 may have atransverse dimension which is larger than the transverse dimension of the centralhole in the ree| 7. Hence the knob 6 may be positioned transversally in the ree| 7, thedrum 8 and the hub 2, while it is still movable in its axial direction as far as thecircumferential flange 12 may allow. Preferably the circumferential flange 12 may beshaped or profiled so that an engagement with the ree| 7 may be conveniently attained, and the ree| 7 may be turned by the knob 6 when the latter is turned.

The hub 6 may, as mentioned above, also be used as an actuator forattaching the screen device 1 to a surface. ln the embodiment disclosed in Fig. 3, theholding means 13 is a suction cup arranged on the reverse side of the screen device1, i. e. on the side that is intended to face the surface whereon it is intended to beattached. By means of a linking device, e. g. with a toggle mechanism, the suctioncup 13 may be activated by pressing the knob 6 and, as the case may be, alsoreleased. The suction cup 13 in the disclosed embodiment is mounted through the ree| 7 and the drum 8 by means of a screw 14 and a nut 15. ln some embodiments, the knob 6 is firmly attached to the ree| 7, and they are thereby coherent. ln some embodiments the knob 6 and the ree| 7 are evenmanufactured as an integral part. The function of the knob 6 and the ree| 7 areessentially the same as described above, regardless of whether they aremanufactured in one piece or as separate parts. As an alternative embodiment, theknob 6 and the central drum 8 may be manufactured as an integral part, and thedrum 8 may be connected to the suction cup 13.

The hub 6 further extends through a central opening in the sheet of material 3.The sheet of material 3 may, in the disclosed embodiment, be fastened to a series ofcircumferentially spaced attachment pegs 16, which are provided on an outer end of 11 the ree| 7, extending through the drum 8. The attachment pegs 16 and the centralportion of the sheet of material 3 are, in the embodiment disclosed in Fig. 3, coveredby an attachment ring 17 which is snapped onto the ree| 7. Various other means forfastening the central portion of the sheet of material 3 may be considered as well,such as gluing, clamping, sewing, providing the central portion with an elastic material, etc.

Fig. 4a illustrates the screen device 1 in an exploded view in perspective, sothat the ribs 5 may be clearly seen in an expanded state. lt may be noted that theyextend approximately tangentially from their respective slits in the drum 8. lf the ree|7 is turned in a clockwise direction, the ribs 5 may be retracted through the slits 10 in an overlapping fashion, as described above.

The parts 6, 7, 8 included in the hub 2, and described above, may be glimpsedbelow the ribs 5. ln particular, the lower profiled ring 11b, which is arranged in a lower part of the drum 8b, may be seen, as mentioned above.

Also, the profiled section of the ribs 5 may be seen in Fig. 4a, and furtherenhanced in Fig. 4b. lt is clear that the concave side of the ribs 5 are facing towardsthe ree| 7, so that each rib may be bent in the direction B, when it has enteredthrough the slit 10 in the drum 8. Thereby the ribs 5 may be wound around the ree| 7in an efficient manner. When the ree| 7 is turned in the other direction, the ribs 5 mayregain their straight configuration after exiting from the slit 10.

Figs. 5a and 5b are partially sectional views of the screen device 1 in itsassembled and expanded state. Herein may be seen orifices 18 in the outer ends ofthe ribs 5, wherein the outer edge 4 of the sheet of material 3 is attached e. g. by sewing or any other suitable attachment means.

The knob 6 is shown in its mounted position inside the ree| 7, as discussedabove. The friction engagement between the profiled rings 11a, 11b, should be notedin particular.

The composition of the sheet of material 3 may be the same in all of thedisclosed embodiments or may be varied depending on the intended area of use. ltmay be a woven textile fabric, a knitted textile fabric, a non-woven material, a plastic 12 material, or a paper-based material. lt may include a sound absorbing material, awaterproof material, and/or a light-reflecting material. The materials discussed as thesheet of material 3 may be used as a sole material or as one of several layers.

The invention has mainly been described above with reference to a fewembodiments. However, as is readily appreciated by a person skilled in the art, otherembodiments than the ones disclosed above are equally possible within the scope ofthe invention, as defined by the appended patent claims. ln the claims, the word "comprising" does not exclude other elements or steps,and the indefinite article "a" or "an" does not exclude a plurality. 13

Claims (1)

1. Claims _ Screen device (1) comprising a sheet of material (3) and expanding means (5) for unfolding the sheet (3), the expanding means (5) having at least one atleast partially expanded state and one fully retracted state, wherein theexpanding means (5) are a plurality of ribs (5) extending from a central hub (2)to the periphery (4) of the sheet (3), and the central hub (2) comprises a knob(6) which actuates a motion of the ribs (5) by a turning motion of the knob (6). _ Screen device (1) according to claim 1, wherein the ribs (5) are attached at their inner ends to a reel (7) inside the central hub (2), and their outer ends areattached to the sheet (3). _ Screen device (1) according to claim 2, wherein the reel (7) inside the central hub (2) is connected to the knob (6) and is arranged to be rotated when theknob (6) is turned. _ Screen device (1) according to any of claims 1 to 3, wherein the distance from outer ends of the ribs (5) to the central hub (2) is varied, when the knob (6) isrotated. _ Screen device (1) according to any of the preceding claims as dependent on claim 2 or claim 3, wherein the ribs (5) are guided in slits (10) in a cylindricaldrum (8) surrounding the reel (7). _ Screen device (1) according to claim 5, wherein the ribs (5) are arranged to extend to one or more at least partially extended states in a directiontangential to the cylindrical drum (8). _ Screen device (1) according to claim 5 or 6, wherein the inner portions of the ribs (5) closest to the inner ends of the ribs (5) are arranged to be woundaround the reel (7), inside the cylindrical drum (8), in the at least one partiallyextended state and the fully retracted state of the ribs (5). _ Screen device (1) according to any of claims 5 to 7, wherein each rib (5) has a profiled section and a concave side is arranged to face a direction towards thereel (7). 14 9. Screen device (1) according to any of claims 5 to 8, wherein the ree| (7) isprovided with a profiled, radially extending index ring (11a), facing a profiled,radially extending index ring (1 1 b) in the cylindrical drum (8), whereby anumber of discrete, mutual turning positions, corresponding to partiallyextended states of the ribs (5), are defined. 10.Screen device (1) according to claim 9, wherein each of the profiled indexrings (11a, 11b) comprises a profiled surface with a periodically varyingthickness in the circumferential direction, and the profiled surfaces arearranged to abut one another with a friction engagement. 11.Screen device (1) according to any of the preceding claims, wherein the sheetof material (3) is attached to the hub (2) at a central portion of the material (3)and to the ribs (5) at the outer edge (4) of the material (3). 12.Screen device (1) according to any of the preceding claims, wherein the sheetof material (3) comprises one or more materials selected from a groupincluding a woven textile fabric, a knitted textile fabric, a non-woven material, aplastic material, and a paper-based material. 13.Screen device (1) according to any of the preceding claims, wherein the sheetof material (3) includes a sound absorbing material. 14.Screen device (1) according to any of the preceding claims, wherein the sheetof material (3) includes a light-reflecting material. 15.Screen device (1) according to any of the preceding claims, wherein the sheetof material (3) includes a waterproof material. 16.Screen device (1) according to any of the preceding claims, wherein the knob(6) is connected to a holding device (13). 17.Screen device (1) according to claim 16, wherein the holding device (13) is atleast one from a group including a suction cup, a lamp fitter, an umbrellahandle, a rod, a stand, or a tripod. 18.Screen device (1) according to claim 16 or 17, wherein the knob (6) isconnected via a bolt (14) to a suction cup (13). 19.Screen device (1) according to any of claims 16 to 18, wherein the cylindricaldrum (8) is connected via a bolt (14) to a suction cup (13). 16