Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S11/00—Non-electric lighting devices or systems using daylight
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
  • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
  • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
• • 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
  • E06B9/266—Devices or accessories for making or mounting lamellar blinds or parts thereof
• • 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
  • E06B9/38—Other details
  • E06B9/386—Details of lamellae
• • 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
  • E06B2009/2417—Light path control; means to control reflection

Definitions

• Venetian blind for guiding the daylight comprising edged lamellae
• the present invention relates to Venetian blinds for guiding the daylight comprising edged lamellae including a first portion disposed in the irridiation area E and at least one second portion/ wherein said first portion is provided more steep and said second portion is provided more flat.
• Venetian blind lamellae have been known which are arranged in front of a facade and include 2 portions wherein the first portion is provided more steep and the second portion is provided more flat.
• the disadvantage of this system is that the two portions are even, or plane, respectively, and sunlight inciding in parallel is hence reflected in parallel again so that glares may occur in the outside or the inside space.
• the lamellae are so large that they have to be produced from two portions and be mounted onto ribs.
• a still further disadvantage is the large distance of the lamellae relative to each other. This may lead to glare at the working place.
• small movable Venetian blind lamellae which are secured in the interior space behind a glass pane. These lamellae include two portions where the first portion is pivotably secured to the second portion. The second portion is wider and oriented towards the interior space. The first portion is smaller and oriented towards the outside space. By pivoting the first portion, the light guiding behavior of the Venetian blind can be controlled.
• the path of the light between the lamella blades changes. It is of disadvantage that also in the pivoted extreme position when making full use of the pivot angle of 30°, there is no light deflection into the outer space at the pivotable lamella portion. Reflection back into the outside space, if at all, occurs only after a plurality of reflections between the lamella blades. In view of these many reflections, absorption occurs in each case at the reflecting or the japanned surfaces so that, in summer, the Venetian blind becomes extremely hot. This causes an undesired secondary heat radiation effect of the Venetian blind towards the interior space. The Venetian blind is not, therefore, suited to take over the desired function of passive room cooling in summer.
• an edged lamella has been known having to concave mirror portions towards the outside space, where the first portion serves for the scattering of the flat sun radiation and second portion serves for the deflection into the interior space.
• Such device does not, however, permit room depth illumination. High summer sun can penetrate into the interior space, and transparency in horizontal direction is not warranted.
• an edged Venetian blind lamella which comprises two portions wherein the first portion is provided more steep and the second portion more flat.
• the rods are then cut in an additional work step to individual lengths. While the process permits of course to cut the profiles at the exit of the machine to a fixed length, it is not possible to pre-shape such profiles, wind them upon a coil, to store the coils, and, if required, unroll the lamellae from the coils and to cut them by a Venetian blind automate to the desired length. It is however exactly this procedure which is required in modern Venetian blind production where also small quantities of shun shades of most various sizes and colors have to be produced. Modern Venetian blind production comprising stored lamellae in a number of colors and in fixed lengths which have to be cut by an individual work steps to the ⁇ desired end lengths is nowadays unthinkable. It is therefore the aim of the present invention to provide a process for the production of an edged Venetian blind adapted to the latest requirements for storage and production techniques.
• the Venetian blind furtheron, should reflect the high summer sun back to the outside space by one single reflection in order to avoid undesired heating of the lamellae.
• a more flat sun should be deflectable by one single reflection to the ceiling and into the depth of the interior space in order to avoid losses of radiation energy caused by absorption, on one hand, and undesired glare at the underside of the upper lamellae, on the other.
• the advantage of the innovation is the scattering of the high summer sun by one single reflection with simultaneous permeability of the Venetian blind for more flat and diffuse radiation towards the interior space while not necessarily using the underside of the upper lamella as a reflector. This makes it possible to fashion the underside of the lamellae colored without having to accept light losses or unnecessary heating-up of the Venetian blind. Because of the distance of the lamellae relative to each other, the second portion receives very much diffuse radiation energy which in view of the positioning of the angle of the tangents of ⁇ 150° relative to the first portion is also deflectable into the depth of the interior space by one single reflection.
• a further advantage of the lamella shape is the good transparency from the interior to the outside space and vice versa .
• the shape of the lamella according to the invention makes even possible to arrange the lamella as a rigid system, i.e. non-movable. Movement or rotation of the lamellae is required only at extremely flat sun in order to avoid direct irradiation of the very flat sun.
• Figure 1 shows the cross section through three Venetian blind lamellae disposed one upon the other
• Figures 2, 3 and 4 show special shapes of the Venetian blind embodiment on the underside
• FIGS 5, 6 and 7 show roll set pairs in the roll form process of the Venetian blind.
• Figures 8.1 to 8.6 show the light guiding behavior of the Venetian blind as a function of the angle of incidence of the sun. by only one reflection o the second portion.
• Figure 1 shows lamellae 10, 11 and 12. Between the lamellae, an irridiation cross section E towards the outside space and a radiation cross section A towards the interior space, each, is formed.
• Lamellae 10, 11, 12 each comprise two portions 13, 14, 15 disposed towards the outside space and 16, 17, 18 disposed towards the interior space. In the present case, portions 15 and 18 are concavely arched. Through the end points of the portions, chords 19, 20 may be drawn forming a point of intersection and an angle of ⁇ ⁇ 160° in the edge of the lamellae. In end point 21 of first portion 14 and starting point 21 of second portion 17, respectively, the tangents in the starting and the endpoint of the portions form an angle of Yi ⁇ 160°.
• the second portion 16, 17, 18 is also concavely shaped, it could, however, also be shaped straight or convex or stepped.
• the distance of the lamellae relative to each other is defined by shadow lines 22, 23. Shadow line 23 passes through starting point 24 of an upper lamella and the final point 25 of a lower lamella and forms an angle of ⁇ _ ⁇ 35°,
• the data on angles of ⁇ _ and ⁇ 2 are essential of the invention. These data on the angles define the distance D of the lamellae relative to each other and, at the same time, the amount of energy or light, respectively, which, on one hand, is reflected by the Venetian blind to the outside and, on the other hand, to the inside in favor of a room depths illumination. If the data on the angles are either substantially exceeded or decreased, the objectives of the present invention can no longer be met.
• the aim of the Venetian blind essentially consists in deflecting flat light irradiation 27 inciding onto the second portion 17 of lamella 11 by one single reflection into the interior space.
• the dotted angular sectors depict that portion of the global radiation which is deflected at the starting, or the final, respectively, point of the second portion to the interior space.
• the capability for light deflection into the room depth depends on the width B 2 of the second portion, on one hand, and on the size of the angular sectors, on the other.
• the complete light radiation inciding onto the first portion is reflected back by one single reflection into the irridiation cross section.
• Only a somewhat more flat sun is reflected onto the underside of the upper lamella and, in winter and in case of colored formation of the Venetian blind, leads as a result of absorption to an advantageous warming up of the Venetian blind.
• a convex shape of the first portion 13, 14, 15 could be thought of as well.
• the disadvantage however is that the sun cannot be reflected into the zenith but rather onto the facade on the opposite side of the road, which might lead to glares.
• Shadow line 22 namely corresponds to the reflected beam 29 in point 26.
• the first portion is circularly or parabolically arched.
• the Venetian blind may be pivoted in a manner known per se about a horizontal axis of the lamellae. Thereby, the angular ratios o-i and ⁇ 2 referred to above are changed. By the angular ratios o-i and ⁇ 2 , the so-called normal position of the Venetian blind is defined. Therefore, the invention relates to all . Venetian blinds which permit an arrangement according to the defined angles o-i and ⁇ 2 .
• Essential of the invention is also the ratio of lamella width B to distance D between the lamellae.
• the distance D of the lamellae refers to the distance of identical contour points between the lamellae measured for instance between upper side and upper side.
• Valid is the following:
• D/B > 0.5 ⁇ 1.00, preferably, however, D/B > 0.7 ⁇ 0.95.
• Essential is the ratio of the lamella portions relative to each other. Valid is the following:
• Figures 8.1 to 8.6 show the light guiding behavior of the lamellae as a function of the angle of incidence of the sun. From Figures 8.1, 8.2 it can be taken that the high summer sun is reflected back by one single reflection into the outside space.
• Figures 8.3, 8.4 show a transition state: one part of the sun is reflected to the outside, one part is reflected to the lower side of the upper lamella, and an increasing part into the interior space.
• Figures 8.5 and 8.6 show between the lamellae an increasing direct transmission as well as a light deflection into the room depth on the second portion of the lamellae. A possible rotation of the lamellae is only required for angles of incidence of the sun of Figures 8.2 and 8.3.
• the greatest precision of the light deflection can be reached by means of mirrored surfaces of at least the first portion or the first and second portion.
• White or diffusely reflective surfaces are conceivable, too.
• the figures are essentially restricted to lamellae comprising two portions. Further portions are, however, conceivable as well, for instance for reasons of stability. It is also possible to subdivide the two portions as described into smaller portions each of which has a geometric function of its own.
• the present invention relates to all lamella shapes comprising at least two portions which are able to perform light guidance substantial for the functioning.
• Figures 2, 3 and 4 show lamellae formed on the upper side thereof as in accordance with the laws described heretofore. They are different as to the underside thereof.
• Figure 2 for instance shows a lamella below the joint between the first and the second portion, showing a cross piece 30 by which the lamella receives a particular rigidity. From the drawing, it can be taken that the lamella has been shaped from one single lamella strip.
• Figure 3 shows a lamella having a staircase-like stepping
• a lamellaeaccording to Figure is advantageously manufactured from steel or aluminum by a rolling process.
• Figure 4 shows a lamella made of plastic material or aluminum as a hollow profile.
• a support element may be inserted for stiffening and reinforcement.
• the profile is manufactured by a pressing or extrusion process.
• FIGS 6 and 7 two typical roll set pairs are shown in Figures 6 and 7 in cross sectional view, consisting of rolls 204 and 205 between which lamella blade 206 is passed and edge 207 is rolled in.
• Rolls 209 and 210 are shaped broader and thus suited to also specifically shape the available concave shape of the lamella in the lamella blade.
• the specialty of the manufacturing process according to the invention is, therefore, seen in that, contrary to the conventional manufacturing processes, by a first process step only the concave arch is shaped in the lamella by means of a roll form device. It is only in a second work step at a later point of time and at a quite different place that in the course of Venetian blind manufacture the edge is pressed into the lamella by means of a further roll form device.
• a first process step only the concave arch is shaped in the lamella by means of a roll form device. It is only in a second work step at a later point of time and at a quite different place that in the course of Venetian blind manufacture the edge is pressed into the lamella by means of a further roll form device.
• the Venetian blind lamellae according to the invention are provided as common as external or internal Venetian blind. Of particular advantage is the arrangement of the Venetian blind in the air interspace of an insulation glazing. Corresponding to the use of the Venetian blind, the lamellae are produced in different widths of for instance 14 mm to 200 mm and broader.
• the Venetian blind lamellae are advantageously arranged in horizontal and are used ' in the roof and facade area. In the roof area, independently from the inclination of the roof, different specifications of the normal position and construction specifications explained in connection with Figure 1 are applied.
• the edge of the lamellae may be bent or rounded.
• a further arrangement is to penetrate the inventive horizontal lamellae with vertical mounted lamellae, so that a grid element is created.

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• Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Blinds (AREA)

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Cited By (1)

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Citations (6)

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• 1995
  • 1995-02-02 DE DE1995103293 patent/DE19503293A1/de not_active Withdrawn
  • 1995-11-24 WO PCT/EP1995/004632 patent/WO1996023950A2/en active Application Filing
  • 1995-11-24 AU AU41756/96A patent/AU4175696A/en not_active Abandoned

Patent Citations (6)

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