DE2655235A1 - BELLOW-LIKE FOLDING BLIND FOR WINDOWS AND DOORS AND A DEVICE FOR OPENING AND CLOSING THE SAME - Google Patents

Description

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December 6, 1976

ROCCAPLAST SpA
Via Stagno, 2nd floor

Roccabianca (Parma) Italy

Bellows-like, foldable blinds for windows and doors as well as a device for opening and closing the same.

Priority from Italian patent application No. 46 952 A / 75 of December 5, 1975 and No. 46 888 A / 76 of August 6, 1976.

There are already foldable blinds for windows, doors and balcony doors known, which in the main by a A plurality of vertical flat contiguous and articulated elements are formed, which suspended between suitable straight horizontal guides and guided in such a way that they are in a plane can be pulled or folded on itself.

In such blinds, the mutual articulation points are between the various composite ones

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Profile elements usually symmetrical to their thickness arranged or on two opposite edges which are provided along a diagonal thereof. These Articulation points also alternately include one Yes and the other no the means of intervention with the leadership and hanging rails.

The known blinds or shutters formed in the above manner can be divided into two types subdivide the arrangement of their combined individual elements when they are fully stretched, i.e., when the surface of the window or the door or the door window is covered.

In the first type, the individual elements are aligned with one another in the extended position, i.e. they form a flat wall, while in the second type the same elements converge with each other and a broken one Form line.

Both types of blinds have disadvantages, which mainly result from their functional, structural and aesthetic aspects Surrender to character.

In the former type of blind, difficulties arise when folding their individual elements, which is to open the "space in which the blind is arranged, which is due to the mutual obstruction of the elements due to the fact that when they are aligned and exerted a force on them that acts in the direction of their alignment, no force component can act perpendicular to the plane of the blind.

To avoid this disadvantage, the use of

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more complicated additional guides or openings are suggested, which in combination with suitable counterparts, which are attached to the individual elements, facilitate the beginning of the folding process and damage avoid.

However, it has been found necessary to provide some sliding ability for the blind to make contact to allow between the mentioned counterparts and the additional guides. With this type of blind Of course, there is not the necessary functional guarantee and breaks can easily occur. Besides that the structure is complicated and the assembly of an increased number of parts is necessary. In addition, is the operation of such blinds is quite noisy.

In the above-mentioned second type of blind While there is no undue difficulty in folding, it is not aesthetic and it favors that Penetration, especially into the lower guide, of deposits and / or atmospheric contamination and Water, which can impair the proper functioning of the blind.

The invention is based on the object to eliminate these disadvantages and to develop a blind that is foldable in the manner of a bellows, has a simple and functional design, sfah automatically in one Layers out level when stretched and gives no difficulty in folding without adding any extra Guides and other gear members are used that are likely to cause undesirable and damage to avoid causing disturbances. In addition, the present blind is provided with a mechanical device to move when opening and closing,

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what with the known. Blinds are not the case.

The blind according to the invention has a sequence of flat profile elements, which are separated from each other by connecting elements, the articulation axes, the are provided on each profile element, arranged symmetrically with respect to the center of gravity of the element are, while the articulation points or axes of the connecting profile elements both are arranged adjacent to the same end face.

According to the invention are also the organs that hold the blind in the respective flat guides to the Connection between elements attached. Likewise, the invention provides that along the frame, the the blind limits, two annularly wound chains are arranged, which is moved by the same sprocket will.

In this way a blind is obtained which is formed by a plurality of flat elements, which when folding the blind to rotate about their respective pivot axes so that they are to each other in the manner of a Arrange the accordion folded, with the flat elements separated by connecting elements, the during always stay parallel to each other during the folding process.

An advantage of the blind according to the invention is that the connecting elements have such a width that it is substantially twice the thickness of the aforementioned flat elements.

According to the invention, the articulated connection between

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the connecting intermediate elements and the flat elements by a profile piece with a spiral cross-section formed v / earth or by a common hinge with spacer rings.

According to the invention it is also provided that the articulation axes between the flat elements that make up the blind and the intermediate connecting elements that attach to the guides are attached when the blind is stretched, all contained in the plane of the support guides of the same are, while the articulation axes between the flat elements and the free connecting elements are outside the level mentioned.

In addition, the two chains according to the invention are shown in opposite directions drawn so that when using these chains the joints of the two end strips that belonging to the two blind parts, they can be opened and / or closed at will by corresponding reversals the direction of rotation of the sprocket.

Likewise, according to the invention, suitable means are provided by which it can be avoided that when stretched or folded blind, the last two strips of the blind parts hung freely like a flag stay.

The chain operating device according to the invention can be used indiscriminately both for a door and for a Windows can be used, i.e. they can be used for both a one-piece blind and a two-piece blind can be used.

According to a further feature of the invention, the entrainment

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The blind parts are preferably done with two chains or with a single chain.

According to a further feature of the invention, the operation of the sprocket, which the chain or Chains pulls, by hand or with the aid of an electric motor or by other suitable equivalent means.

The blind according to the invention and the corresponding Actuating devices are explained in more detail below in connection with the accompanying exemplary drawings described and show:

1 shows a partial view in a diagrammatic representation of the blind according to the invention with the suspension elements;

Fig. 2 is a partial view in perspective of the intermediate connecting element, which the Latching means the end pin shows?

3 shows a plan view of a section of the blind in two different positions of use;

4 shows a partial view in a diagrammatic representation of the blind according to another embodiment;

Fig. 5 is an end view, partially in section, of the fully extended blind together with the operating device;

Fig. 6 is a view in plan view and in horizontal section in Fig. 5 with fully extended and in Folding of the blind (position shown in dash-dotted lines);

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Fig. 7 is a partial view in perspective of a blind section, in which the type of Connection is shown, which exists between the suspension and the guide elements of the blind, as well as one of the blind operating chains;

8 shows the drive elements of the chains;

FIG. 9 is a view in section along the line IX-IX in FIG. 8; FIG.

Fig. 10 is a view in cross section of the upper and the lower horizontal profile piece, which serves as a guide both for the suspension elements of the blind and for the horizontal sections of the chains to serve;

11 shows a diagram of the actuating device for a two-part and a one-part blind;

FIG. 12 is a diagram of another embodiment of FIG Actuator with a single chain and a one-piece and two-piece blind;

13 shows a schematic representation of a further embodiment of the actuating device.

Before further explaining the invention in conjunction with the accompanying drawings it should be mentioned that for the sake of clearer representation and for the better Understanding of the structural and functional features of the blind according to the invention in FIGS. 1 to 4 Invention in two embodiments without the actuating device is shown, in turn, in the rest

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Figures is shown for only one of the embodiments.

From Fig. 1 to 3 it follows that the blind consists of a Row of hollow strips 1 is composed, which is essentially cuboid and whose outer surfaces are opposite have vertical grooves 2 of substantially triangular cross-section, on which suitable inner Stiffening walls 3 are provided.

Each individual bar 1 is with the following or preceding connected by the interposition of a suitable intermediate connecting element 4. This element is made essentially by an extruded profile piece, preferably of the same material as the element 1 formed, the cross section of which has an opening 5 in the central part, which is essentially the shape of a Sector of a circular ring, the inner limit of which is formed by a straight line, while its external limitation by two suitable symmetrical spirals 6 is extended, the curvature of which is opposite to the curvature of the aforementioned outer boundary.

At a suitable distance from the upper and lower edge, the mentioned intermediate elements 4 have two suitable, substantially rectangular slots 7.

The side edges of the strips 1 are shaped with suitable curves 8 which run spirally around a surface to obtain which is adapted to the area of the spirals 6 of the sector-shaped intermediate elements 4. These curves 8 are symmetrical and opposed with respect to the central axis of the bar. The connection between the intermediate elements 4 and the strips 1 is done in that the spirals 8 of the strips 1 in the spirals 6 of the sector

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can be used.

It should be mentioned here that the spirals 8, which protrude from the edges of the strips 1, are opposite to the width of the strips are such that the intermediate sectors 4 alternate in two opposite positions can be arranged.

In the opening 5 of the intermediate element 4 (see Fig. 2), a shaft 10 is pressed, the cross section of which in essentially coincides with that of the opening 5 and which is inserted until two suitable teeth 11, the protrude from the shaft, snap into the slots 7 of the surfaces of the opening 5. The presence of slots 7 and teeth 11 for connecting the shaft 10 in the opening 5 of each intermediate sector 4 is not essential, since the connection can also be made in another way, for example by a suitable adhesive or by riveting.

On the shaft 10 a plate 12 is arranged, 'which against the upper or lower edge of the intermediate sector and against the ends of the upper or lower edges of the two strips 1 connected to it.

A device 10-12 assembled in the manner described is inserted into the opening 5 of each intermediate sector 4 is used, which is intended to emerge from the vertical plane that passes through the lower and the upper guide is determined while in the intermediate sectors 4, which are intended in the mentioned plane to stay or slide into the device m10-12 are used (Fig »1) except for the shaft 10 and of the plate 12, connected to the latter a short one

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have cylindrical or prismatic section 13, which ends with a plate 14, which is preferably square or rectangular and to the one below Plate 12 which enters the interior of the rectilinear upper or lower guide 15 is parallel.

These upper and lower rectilinear guides 15 are essentially formed by an extruded profile piece formed from a suitable material having two adjacent longitudinal channels 15 'and 15 "of which the channel 15 ′ has a slot 16 in its lower wall which is a sliding guide for the shafts 13 of the hanging and guiding devices 10-12 of the blind forms.

In addition, the outer wall of the channel is 15 ″ from the slot 16 extended from by a section 155, which branches into two walls that lead to the mentioned section are perpendicular, namely in an outer 15a and in an intermediate wall 15h.

In Fig. 3 the arrangement is shown schematically, which the assembled elements 1 and 4 of the blind take in two different positions.

The position shown in full lines is the one in which the assembled different elements 1 and 4 when partially folding the Venetian blind, while the position shown with dash-dotted lines is the one in which the elements are located when the blind is fully extended, i.e. when the elements are fully aligned and a form a flat wall.

From Fig. 3 also shows that the transition from the

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stretched position to the folded position or vice versa without interference between the elements of the Blind thanks to the intermediate elements 4 going on.

Indeed, if a slight pressure is exerted on the extended blind, because of the arm, which is located between the two articulation lines, generates moments that the stepping out of the intermediate sectors 4, which are not connected to the guide 15, with relative entrainment of the strips 1 that are attached to these are articulated, cause.

The plates 14 slide inside the channel 16 of the guide 15 until the various strips 1 are completely fold like a bellows and lay against each other.

This is made possible by the fact that the cylindrical surface of the intermediate sectors 4 is curved into adapted vertical ones Depressions 9 occur in the lateral edges the strips 1 are provided.

To move the blind from the folded to the stretched one To bring position, of course, the composite elements 1 and 4 behave completely when exercising a pull opposite to that indicated for the reverse actuation described above.

Another possible solution for the blind according to the invention is shown in Fig. 4, from which it can be seen that the connection between the intermediate sector 4 and the sidebars 1 is obtained by means of a conventional hinge of the type usually used can be used for cabinet parts.

From Fig. 4 it can be seen that the intermediate sector 4

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mustard through an extruded profile piece from substantially rectangular cross-section is formed, the side edges of which bear opposite eyelets 17, and are of a suitable length so that they are spaced apart from one another by a size substantially the length of the eyelet 17 corresponds.

Between the eyelets 17 worn by the intermediate sector 4 there are eyelets 18, which extend from the side edges of the Groin 1 to be worn.

The connection between the mentioned sector 4 and the strips 1 is obtained by inserting a pin 19 made of steel or a suitable plastic of suitable length in the holes 20 leading to the eyelets 17 and 18 are coaxial.

The mentioned pins extend with their ends in suitable countersunk bores 21 in the plate 12 are provided and on which they are riveted. The assembly of the blind according to the invention for Both versions come together with all accessories and the device for its actuation will be described in more detail below in connection with FIGS .

From these figures it can be seen that the schematically illustrated Lasts are united with each other by connecting elements 4, with reference to which the mentioned lasts 1 can rotate freely.

When the blind is fully extended, one height part of the connecting elements 4 (see Fig. 6) is alternately that one yes, the other no, included in the level that

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is determined by the straight slots 16 of the upper and lower horizontal profile piece 15. The remaining part of the height of the connecting elements 4, based again on FIG. 6 when the blind is fully extended, or those intended to be removed from and / or approached from or to the mentioned plane contained in a plane parallel to and remote from the plane defined above essentially of an amount which is equal to half the thickness of one of the strips 1.

In particular from Fig. 5 and 6 it follows that on the last two strips 1 of the two sections, which form the blind, by sliding the usual two end portions 22 are attached, each of which is provided with a flat shoulder 23, each of which is complementary to or associated with the other.

As can be seen, the thickness of the flat projections 23 is essentially half the thickness of the strips 1 by that of the end portions 22. At the opposite ends of the connecting elements 4, which are to step out are determined from the plane containing the fully extended blind are inserted and hinged the shafts 10, their outer ends with Plates 12 are provided which prevent the strips 1 from separating from the connecting elements 4.

In contrast, are at the ends of the connecting elements 4, the are designed to always remain in the plane that is determined by the fully extended blind, the shafts 10 inserted, which are provided with the plate 12 and the plate 14, which in the rectilinear Channels 15 'of the upper and lower profile piece 15

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be introduced, which only serve to support the blind during the opening and closing process, or to lead.

Instead of the plates 14, which are carried by the shafts 13, a roller made of Teflon can be freely rotatable or a pair of opposing Teflon rollers inserted into the straight channels 15 'of the lower and upper horizontal profile piece 15 slide.

The purpose of this is to convert the grinding friction of the plates 14 into rolling friction for the T.eflon rollers to convert, so that the forces are significantly reduced, which are necessary to open and close the blind are. In the vicinity of the corresponding connecting element 4 are the last two strips 1, which are to belong to the two parts forming the blind, provided with a curved stop 24 both at the top and at the bottom, which during the closing and opening processes of the blind on vertical grub screws 25 in Connection and come into contact, which protrude from the lower and the upper profile piece 15, on which the threaded pins 25 are arranged in a suitable manner.

On the inside of the mentioned two last strips 21, which belong to the two sections of the blind, are then the two complementary parts of a conventional locking device 26 of the two fully extended Blind parts attached.

In the middle of the horizontal profile pieces 15 and the surface of the latter, that of the outside of the blind is facing, two blocks 122 are provided.

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The top of the lower block 122 and the bottom of the upper block 122 are in one slightly higher or slightly lower height than the lower or upper edge of the blind.

On the sides of the blind, two vertical profile pieces 27 are attached, which, in contrast to the horizontal profile pieces 15 have a cross-section substantially in the form of a U, the open side of which The outer surface of the blind is facing.

To connect between the mentioned horizontal profile pieces 15 and the vertical profile pieces 27 are three housings 28 are provided, and on the right lower edge a housing 29, which is slightly larger than the housing 28 is.

In each housing 28 two pins 30 are provided, on which two grooving rollers 31 are freely rotatably mounted.

In this pin 30 screws are screwed to Fastening of a cover on the housing 28 are used, and in a similar way a cover 33 for the housing 29 is used intended.

In the housing 29 two grooving rollers 34 and a sprocket 35 are arranged, in which a prismatic shaft Hand crank 36 is inserted.

A chain 37 is led around over the outer grooving rollers 31 and over the sprocket , the ends of which are connected to a tension spring 38 in such a way that the chain 37 is kept under tension at all times.

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265523b

In a similar way, a second chain 39 is placed over the three inner grooving rollers 31 and over the grooving rollers 34 as well as over the sprocket 35 , the ends of which are connected to the opposite ends of a tension spring 40 which keeps the chain 39 under tension at all times. In particular from Fig. 7 it follows that on the upper shaft, which is inserted into the connecting element 4, to which the last strip 1 of the right blind part is hinged, a projection 41 protrudes, onto which a link of the outer chain 37 is pushed. From the lower shaft of the same element 4 protrudes (not shown for the sake of clarity), onto which a link of the inner chain 39 is pushed.

In the case of the left-hand blind part, the last connecting element 4 with the two chains 37 and 39 is reversed Connected in a way, above with the inner chain 39 and below with the outer chain 37.

In Fig. 11, 12 and 13 are in a schematic manner and in front view when the blind is fully closed Chain device and the two embodiments shown.

In Fig. 11, the dash-dotted line is intended to represent the center of the blind on which the two last strips 1 of the two parts forming the blind meet.

The line drawn with a dash and two dots, on the other hand, should represent the end edge of the blind, which is one-piece. The two lines, namely the one with bars and a point between them and the other with dashes and two dots have therebetween in Fig. 12 and 13 have the same meaning.

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265523b

In Fig. 11 with "" bold dots "the connection points between the last connecting element 4 of the right blind part with the chains 37 and 39 designated. The connection points, on the other hand, should be marked with the "bold x" of the last connecting element 4 of the left blind part with the inner chain 39 and the outer chain 37 v / earth.

The "fat rectangles" are intended to connect the last connecting element 4 to the two chains 37 and 39 mark for a one-piece blind.

These "bold dots", "bold x" and "bold rectangles" as well as the numerical reference symbols have the same Meaning also in Fig. 12 and 13. From Fig. 12 it can be seen that the actuating device differs from the previously described differs in that it has a single chain 200, which over the Groove rollers 31 and 34 are guided back and forth in such a way that that there is a course in the form of a "C", the two "C" being equiaxed and extending along from three sides of the frame of the blind extend, two of which are horizontal and one of which is vertical.

A tension spring 100, which keeps the chain under tension, is inserted between the links of the chain 200.

In the embodiment shown in FIG two chains 70 and 80 are provided, the first of which is annular along a horizontal side of the Frame of the blind is guided and the second with an annular course along two sides, of which the one is vertical and the other is horizontal.

Between the links of the two chains 70 and 80 are

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two springs 50 and 60 are used, which keep the chains mentioned under tension. While the chain is 70 is guided over the sprocket 35, the chain 80 runs over a sprocket 90, which from the sprocket 35 over a third chain 92 is driven, which is guided around two sprockets 93 and 91, of which the the former firmly connected to the sprocket 35 and equiaxed is, while the second is firmly connected to the sprocket 90 and is equiaxed.

The third chain 92 is necessary around the two loops or rings formed by the chains 70 and 80 keep in the same plane.

If the latter requirement does not need to be met, the two chains 70 and 80 can be from one Double sprocket are driven.

The mode of operation of the actuating device according to the invention fitted blind is as follows.

If, with the blinds fully closed, the operator activates the locking device 26, which controls the two parts or The wing of the blind connects, opens by means of the crank 76, the chain wheel 35 is rotated clockwise, which drives the two chains 37 and 39, the former rotating clockwise and the second rotating anti-clockwise is.

Through the two lugs 41, one of which at the top with the chain 37 and the other at the bottom with the chain 39 in Is engaged, the last connecting element 4 of the right blind part or wing is pulled to the right, what the emergence of the connecting elements 4 result

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that do not belong to the vertical plane that goes through the straight slots 16 of the profile pieces 15 is determined.

The connecting elements 4, which, however, belong to the level defined above, remain in this level, in which they slide as the plates 14 enter the rectilinear channels 15. In the same way and at the same time the left part or wing is folded and pulled back to the left.

During these opposing folding movements, additional friction and vibrations are caused by the two Extension springs 38 and 40 easily absorbed and dampened.

When the two blind sides or sashes are almost completely are folded back, the curved stops 24 come from the last two strips 1 of the mentioned parts or wings protrude, in contact with the outer threaded pins 25, so that the mentioned the last two strips 1 are rotated and come against the two strip packages to the plant, which are in the Form the vicinity of the two vertical Profilstücka 27.

These last two strips 1 then remain permanently in contact with the two packages formed as a result of the The curved stops 24 bear against the outer threaded pins 25.

The entire sequence of the operations described above is used to close the two parts or wings of the blind repeated in the opposite sense.

The inner threaded pins 25 are arranged so that at the end of the closing process of the two parts or wings

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- aer -

the curved stops 24 come into abutment on the inner pins 25 for rotation with a slight advance the last bar 1 of the right wing with respect to the rotation of the last bar 1 of the left wing enable.

This enables the end portions 22 to be rotated without interference from the two blocks 122 and, at the same time, enables that the two flat stops 23 lie against each other.

The opening and closing of a one-piece or single-wing venetian blind happens in a completely similar way as described above for the two-part or two-leaf blind. Because of the simplicity of the actuation device, the description of the operation of the two in FIGS. 12 and 13 schematically illustrated embodiments This is not necessary for the two-part as well as for the one-part blind, as the method of operation is completely similar to previously described.

It should also be mentioned that the position assumed by the sprocket 35 is not mandatory, but depending on the Type of use, the environment in which the blind is installed and depending on the mode of operation with two wings or parts or with a single wing or Part of the sprocket 35 can be provided at the desired location.

Finally, according to the invention, the hand crank 36 can be driven by a suitable electric motor or an equivalent drive element be replaced. Although the actuator according to the invention for the blind according to the illustrated both embodiments is particularly suitable,

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it can also be used for another type of folding or concertina-style blinds.

The invention is of course not limited to the embodiments described and illustrated above, but can experience various changes within its framework.

Claims ;

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Claims (1)

Expectations ; f 1.! Mechanically operated, bellows-like, foldable blind especially for windows, doors or balcony doors, characterized by a number of flat elements (1), which are separated by intermediate connecting elements (4) of a width which is substantially corresponds to twice the thickness of the flat elements, the latter and the intermediate elements on each other are hinged at their side edges, the intermediate connecting elements (4) alternately on the Carrying and sliding guides (15) attached for the blind are, two concentric, in the same plane, endless chains (37, 39) within of the sections are provided that form the frame of the blind, which two endless chains are attached to each corner of the frame can be deflected by two freely rotatable grooving rollers (31) and in one of these Corners a chain wheel (35) is arranged, which serves to drive the chains, which in turn the blind or the blind parts or wings when opening and closing by suitable organs that drive the wings are provided and are in engagement with the chain links. 2. Blind according to claim 1, characterized in that the articulation axes of each flat element (1) are in 709824/0362 265523b near its two opposite faces and in a symmetrical position. Blind according to Claim 1 _r, characterized in that the axes of articulation of each intermediate connecting element (4) are located in the vicinity of the same flat surface. 4. Blind according to claim 1, characterized in that the articulations between the flat elements (1) and the intermediate connecting elements (4) by two mutually adapted lugs (8, 6) of spiral Cross-section formed in mutual. Engagement with each other. 5. Blind according to claim 1, characterized in that that the articulations between the flat elements and the intermediate elements from a double row of spaced apart aligned rings or sleeves (17, 18) are made through a single central pin (19, 21) in the form of a rod or a rod made of steel or one other suitable material are connected. 6 · Venetian blind according to claim 1, characterized in that the intermediate elements are formed by a hollow section which serves to have two at its ends Plates (12) received with an insert shaft (10) are provided and are wider than the 709824/0362 Side edges of the section extend out. 7. Blind according to Claims 1 and 6, characterized in that that a slider protrudes from said plates alternately, which slider intended for sliding movement in the guides (15) of the blind above and below in order to carry them. 8. Blind according to the preceding claims, characterized in that the articulation axes of the intermediate elements, from which the carrier carriages protrude, are contained within the plane of the guides. 9. Blind according to the preceding claims, characterized in that the articulation axes of the intermediate elements (4) that are not bound by the guides are outside the level of the guides, if the blind is stretched. 10. Blind according to Claims 1 and 5, characterized in that that the two hinges of each intermediate element are attached to two end plates. 11. Blind according to claims 1, 5 and IO, characterized in that that the hinge rods extend from alternate intermediate elements and in two sliders are secured, which are used in the carrier guide for the blind. 709824/0362 12. Blind according to claim 1, characterized in that a tension spring (38 _f 40) are arranged in a suitable position between the links of each of the chains in order to keep the chain under tension and to reduce the additional friction or vibration which each part resp. The wing of the blind when opening or closing is exposed to absorb or attenuate. 13. Blind according to claim 1, characterized in that said chain wheel with a square opening is provided, in which a prismatic shaft of an operating handle (36) are used can. 14. Blind according to claim 1, characterized in that the one with the chain links in engagement Organs are essentially formed by two lugs, pins or hooks (41) attached to the two Suspension and guide shafts for the blind protrude and at the upper and lower end of the last intermediate connecting element (4) of each wing are appropriate. 15. Blind according to claim 1, characterized by a single endless chain (200), the length of at least three south of the frame of the blind, namely, along two horizontal sides and along one vertical side. 709824/0362 16. Blind according to claim l _{r characterized by two chains CSQ r} 7Qi * ¥ OE which run in the same plane, the first of which runs endlessly along at least two sides of the frame of the blind _r namely along a vertical side and a horizontal side _r during the second chain (7O) is arranged at least along the horizontal side of the frame, one of which chains is driven by the chain wheel (35} , while the second chain is driven by a second chain wheel C90) s which is driven by the drive chain wheel. 17. Blind according to claim 1, characterized in that the itatrlebskettenrad ( 35) is driven by a suitable electric motor or some other equivalent drive device. 18 «Venetian blind according to claim 1 _f, characterized in that two pins (25) are provided at suitable points on the upper and lower horizontal sections of the Venetian blind, against which curved stops C24) rest from the last elements or strips of the Venetian blind parts or -leaves protrude in such a way that the latter, when the blind is fully folded *, rest against the strip packages obtained, while when the blind is fully extended, these come in the same plane as the previously extended ones. 19. Blinds for windows or doors and a device 703824/0362 to open and close the same as above and shown in the enclosed two-line drawing. 709824/0362