Abstract:
A roller blind for covering openings to refrigeration units, windows, and sliding roofs for vehicles is provided in which the roller blind web defines a tubular pocket along respective longitudinal sides of the web. Opposing guide members are positioned on opposite sides of the roller blind web and retain therein the respective tubular pockets. Optionally, the tubular pockets may extend in both the warp and weft direction and additional interior pockets may be provided along the web.

Description:
RELATED APPLICATIONS 
   This application claims the benefit of German application serial number 100 54 852.0 filed on Nov. 6, 2000, and European Community application serial number 02 011 326.4 filed Jan. 18, 2002. 
   FIELD OF THE INVENTION 
   The present invention relates to a roller blind system for covering openings such as windows, refrigerator openings, sliding roof vehicles, and similar openings. 
   BACKGROUND OF THE INVENTION 
   In order to cover openings, e.g., in refrigerators, windows, sliding roofs for vehicles and the like, it is known that a roller blind, or similar web structure, can be guided within laterally parallel guides of the cover openings and which further provides a connection with the wall parts limiting the opening. A cover guide rail is usually provided for this in which the roller blind rod slides and guides the roller blind web following the roller blind rod. In the case of Venetian blinds, in which the roller blind web consists of individual, rigid strips, the closure of a window opening is on the whole satisfactory. However, these roller blind webs are massive and therefore require a corresponding spatial and financial cost. This type of roller blinds is not suitable for sliding roofs of vehicles nor useful as roller blinds for darkening rooms for presentations of films or photographs. 
   In order to darken rooms for the presentation of films or photographs, roller blind webs are used that consist of a thin, flexible material. The roller blind webs are lowered vertically in front of the window openings. In order to avoid the incidence of light, a broad cover strip is set on the edge in front of the window opening on which strip the roller blind web rests. This cover strip can also be designed to be double-sided, so that the roller blind web runs in a guide. This type of guidance requires a relatively large amount of space and necessitates that the flexible roller blind web hang down substantially vertically. Also, a tight guidance of the roller blind web is not assured and the incidence of light can not be completely avoided due to the required width of the guide slot. 
   With respect to closures for a refrigeration unit, it is important that the refrigerator be tightly closed to avoid an undesired exchange of air and therewith a loss of heat while at the same time permitting ready access to goods stored in a refrigerator. In locations and operating environments commonly found in schools, administrative offices and cafeterias, self-service refrigerators are used during breaks and at meals. At other times, the refrigerators should be closed to secure against product theft and to conserve energy. 
   In the case of vehicles, a stable guidance of the roller blind edges that resists wind pressure and similar influences is important. 
   Lateral guides for roller blinds or protective curtains are known that comprise a hollow seam or border on the roller blind web and which extend along an edge running vertically to the roll-down axis. The seam is held laterally in the rolled-down state by a rod element by which the hollow seam is pulled when the roller blind or protective curtain is rolled down. The rolled-down curtain is held substantially along the entire hollow seam on the rod element as seen in references DE 2 99 225 93 U1 and DE 19 609 082. The roller blind systems described in the cited references do achieve an obligatory and stable connection of the roller blind to the wall limiting the opening; however, the hollow seam for guiding the roller blind has a disadvantage in that the hollow-seam edge becomes bulky during rolling up and therefore increases the diameter of that portion of the blind relative to the rest of the roller blind web. As a result, the winding up not only requires a significant amount of space but also results in a non-uniform winding up and a subsequent distortion of the roller blind web. Moreover, the manufacture of such hollow seams requires additional manufacturing effort which renders the roller blind device more expensive. 
   The present invention therefore has the problem of eliminating these disadvantages and creating a roller blind system that assures a stable and obligatory connection of the roller blind to the wall limiting the opening to be closed but is yet simple and thus economical to manufacture. This problem is solved by a roller blind system for covering openings in a refrigerator, window, sliding vehicle roof, and similar openings in which a roller blind web comprises tubular pockets on its longitudinal sides, the pockets being engaged by a parallel guide arranged on opposite sides of the opening, the tubular pockets extending in a longitudinal direction along the roller blind web. 
   In one embodiment of the invention, the parallel guide further defines a hollow profile which is closed on one end opposite a reel of the roller blind by a cap, the cap further securing a terminus of the guide rod. 
   In addition, double layers of materials and seam junctures are avoided, so that the roller blind web exhibits a uniform thickness over the entire width including the edge area, as a result of which irregularities during rolling up and deformations are avoided. 
   If tubular pockets are worked into the material web over the width at certain intervals, roller blind webs with different widths can be manufactured in accordance with the grid of these tubing pockets without having to set a certain roller blind width during the manufacture already. This achieves great flexibility of adaptation to different, required roller blind widths and reduces inventory storage needs. The lateral guidance is established in a simple manner by a rod engaging into the tubing pocket so that voluminous boxes for a lateral guidance of the border edge of the roller blind are not necessary. As a result of the obligatory guidance a short engagement of the border edge of the roller blind into the lateral guide is sufficient. This is especially advantageous in vehicle construction. 
   Tolerances can be readily compensated and the roller blind web held under tension by the transverse mobility of the guide rod and by a fastening of the hollow profile that is elastic in the direction of movement of the roller blind. 
   Further details of the invention are described below with reference made to the drawings. 

   
     BRIEF DESCRIPTION OF THE FIGURES 
       FIG. 1  shows the roller blind system of the invention in a front view. 
       FIG. 2  shows the roller blind system of  FIG. 1  in a top view in cross section. 
       FIG. 3  shows the roller blind in section. 
       FIG. 4  shows left-side roller blind guide in section. 
       FIG. 5  shows a cross section of  FIG. 6 . 
       FIG. 6  shows a right-side roller blind guide in section. 
       FIG. 7  shows a roller blind web with tubing pockets in the warp direction and the weft direction. 
   

   DETAILED DESCRIPTION 
     FIG. 1  shows a front view of a refrigerator  6  with lateral walls  61 , top  62  and base  63 . A roller blind device consisting of roller blind web  1  with closure strip  15  and parallel guides  2  and roller blind reel  7  is provided for covering the opening formed by lateral walls  61  and top  62 . 
   As best seen in reference to  FIGS. 4 and 5 , the parallel guides are designed as box-shaped hollow profile  2  with longitudinal slot  21  through which roller blind web  1  can pass. Guide rod  3  is arranged inside hollow profile  2 , the diameter of rod  3  being greater than the width of longitudinal slot  21 . The guide rod  3  engages tubular pocket  11  of roller blind web  1  that is widened as a consequence so that roller blind web  1  is held fast with its border edge  14  inside hollow profile  2 . Roller blind web  1  with tubing pocket  11  widened by guide rod  3  is supported thereby on the inside of hollow profile  2  and can not be withdrawn through this slot  21 . A forced guidance of roller blind  1  is produced in this manner. Guide rod  3  is anchored by its bent foot  31  in recess  41  of closure cap  4  on the lower end of hollow profile  2 . As is apparent from  FIG. 4 , recess  41  is open at the top on the side facing slot  21  so that guide rod  3  can slide horizontally by its foot  31  in this recess  41 . In this manner tolerances in the width of roller blind web  1  can be compensated so that roller blind web  1  is always supported by widened tubular pockets  11  on both sides of longitudinal slot  21  on hollow profile  2  and is uniformly tensioned. 
   Roller blind web  1  preferably consists of a woven fabric into which tubular pockets  11  have been woven in, e.g., in the warp direction. As is apparent from  FIG. 3 , the tubular pockets  11  can be worked in at certain intervals in the weft direction. These tubular pockets  11  are arranged on the edge of roller blind web  1  for receiving guide rod  3 , within the tubular pockets  11  and thus guides roller blind web  1  in a directed manner during its up and down movement. The arrangement of the tubular pockets  11  distributed in the weft direction over the width of roller blind web  1  has the advantage that the material for roller blind web  1  can be manufactured with a uniform work width and that roller blind webs  1  can be cut out of the same material in different widths B. Cut edges  14  are then worked for strengthening, which can take place, e.g., by welding the synthetic material so that a fraying of these edges is prevented. The edges can also be strengthened by adhering, e.g., during a bonding or coating process. 
     FIG. 7  shows an original illustration of a section of a roller blind web  10  comprising tubular pockets  11  in the weft direction ( 11 S) and also in the warp direction ( 11 K). Material fields  16  consisting of a single-layer woven fabric are produced between the cross of tubular pockets  11 . These material fields  16  are manufactured with a coarser weave so that a certain transparency prevails in these material fields, as explained below. Such a material web with tubular pockets  11 S and  11 K can be used both in its width and also in its length as a roller blind web since pockets  11 S as well as pockets  11 K can receive guide rods  3 . Depending on whether pockets  11 S or  11 K are located in the transversal direction to the material web, they can then serve to receive the roller blind rod or also stiffening rods. In such a design roller blind webs can be manufactured very flexibly for very different uses and dimensions. 
   The manufacture of roller blind web  1  takes place in that at first a woven fabric is manufactured in which tubular pockets  11  are woven in the longitudinal direction (warp direction) of roller blind web  1 . As is apparent from  FIG. 7 , tubular pockets  11 S can be woven in at the same time in the transversal or weft direction also, so that a checked structure is produced. The manufacture of such pocket fabrics is basically known and therefore does not need to be described in detail here. These fabrics can be readily manufactured with the customary chain or dobby looms. However, a jacquard power loom is required for irregular contours. 
   As already mentioned above, it is advantageous if the full work width of the loom is utilized. Pockets  11  are worked in, i.e., woven, over the width of the web at such an interval that, depending on the desired roller blind width, these pockets  11  laterally limit different roller blind web widths B so that different roller blind web widths B can be cut out of the original web. The fabric is compressed in the area of pockets  11  on the two fabric planes by the use of additional threads, e.g., in the warp. Material strips  12  between pockets  11  are advantageously woven in an open structure. However, care must be taken that the fabric has the same thickness in the area of pockets  11  as well as between pockets  11  in order that no beads are produced when rolling up. 
   After the woven fabric is completed it is washed, fixed and finished in such a manner that a closed, covering coating is applied in the area of the closely woven pockets on both sides. Care must be taken that the finishing mass or coating mass does not adhere the two fabric webs in the area of pockets  11  to one another. Aside from the fact that it is necessary for this to adjust the viscosity of the coating mass in such a manner that it does not penetrate textile roller blind web  1 , it is necessary to take steps to assure that the roller blind web  1  to be coated is compact enough, at least in the area of pockets  11 . This can take place in various ways. It has proven to be beneficial if roller blind web  1  is hot-ironed (at approximately 210° C.) at least in the area of pockets  11 . This compresses the threads in such a manner that no coating mass penetrates. The use of texturized thread material has also proved to be especially advantageous. Both measures can also be used in a combined manner for reliability as referenced in the inventor&#39;s prior patent application set forth in DE 19836447.4. 
   The air permeability remains largely preserved in the case of material strips  12  between pockets  11  since the finishing mass or coating mass does not completely close the coarse fabric structure. The latter can be achieved either by a differing density of the woven fabric structure in the area of the pockets and strips or by adjusting the viscosity of the finishing or coating mass. The air permeability in intermediate strips  12  brings about a controlled convection, e.g. in roller blind devices for refrigerators, in the area of roller blind web  1  and thus prevents condensation water and perspiration water. 
   This controlled convection can also be achieved in the following manner: After the washing and fixing the woven fabric is coated in a covering fashion on both sides by a bonding with foils or also by a wiper coating. A closed, air-tight woven fabric is produced in this manner. Care must also be taken during the coating that the interior surfaces of pockets  11  do not adhere to each other. Appropriate adjustments to the pressure, temperature, and/or the viscosity of the coating mass may be made in addition to the previously mentioned techniques. After the coating, perforations  13  are stamped out in the area of strips  12  between pockets  11  in order to re-establish a certain, controlled air permeability of the material, that is necessary to achieve a convection flow in the area of roller blind web  1  to prevent condensation water and perspiration water. 
   In order to further increase the effectiveness of energy savings and thermal insulation the woven fabric web can also be vapor-deposited and sealed after the washing and fixing with aluminum, during which a previously vapor-deposited foil can also be bonded on in the latter process. 
   The desired roller blind web  1  is now manufactured by cutting the woven fabric web to size. The outermost edge of pockets  11  suitable for the desired width are subsequently used. The cuts to the fabric web are made in such a manner that a narrow border edge  14  remains outside of the outer edge of pockets  11 . This border edge  14  is additionally welded in order to prevent fraying. Roller blind web  1  is then fastened by its one end to roller blind reel  7 . On the other end the guide rods  3  are introduced into the two respective edge pockets  11  to the right and the left on the material blank. 
   In order to facilitate the introduction of guide rods  3  into pockets  11 , funnel-shaped guide pieces  5  can also be inserted into the pockets  11 , the guide pieces  5  surround guide rod  3  as best seen in reference to  FIGS. 5 and 6 . Guide  5  defines a sleeve  52  and which is supported by a collar  51  on the inner wall of hollow profile  2 . In this manner not only an easy introduction of guide rods  3  into pockets  11  is achieved but also at the same time an easy, unhindered sliding of roller blind web  1  in parallel guides  2  is achieved. Closure strip  15  ( FIG. 1 ) is attached to the free end of roller blind web  1  facing away from reel  7  in such a manner that the material edge is enclosed and guide pieces  5  are held in the exact position. To this end, closure strip  15  can be designed as a clamping profile or also as a two-part profile that is screwed together, adhered or welded. 
   The roller blind system is preferably installed as a structural unit consisting of shaft  7  for winding up the roller blind web with a winding-up or reel mechanism, and of roller blind web  1  itself with closure strip  15  in a housing fixed to top  62  of refrigerator  6 . Parallel guides  2  are fastened to side walls  61  and can be fastened with traction springs  23  to refrigerator wall  61 , as is apparent from  FIG. 2 . In this manner parallel guide  2  can exert an appropriate force for tensioning roller blind web  1  in the transversal direction. 
   As addressed above, the guidance of roller blind web  1  takes place on the edges by means of guide rods  3  that are arranged in hollow profiles  2  and engage in pockets  11  worked in at the edge of roller blind web  1 . Roller blind web  1  is thus pushed with pocket  11  over the guide rod  3  when the roller blind web  1  is retracted or extended. Guide rod  3  is fixed in hollow profile  2 , profile  2  further comprising a longitudinal slot  21  through which roller blind web  1  extends. Respective pockets  11  and rods  3  are arranged inside hollow profile  2 . The slot  21  is only wide enough that roller blind web  1  can pass through it. Pocket  11  which is engaged by rod  3  is retained by the hollow profile and by collar  51  of guide piece  5 . Whereas guide rod  3  is stationary, roller blind web  1  can be pushed up and down and is drawn off from guide rod  3  during rolling up. However, it is advantageous if a part of roller blind web  1  remains introduced in pocket  11  with grip strip  15 . 
   An absolutely reliable, lateral forced guidance is achieved in this manner. The opening of refrigerator  6  can be completely closed. The slot-free closure at lateral walls  61  of refrigerator  6  achieves an optimal savings of energy and prevents access when the roller blind is closed. 
   This roller blind system makes extremely small structural dimensions possible since no bead is produced when the material is wound up onto roller blind reel  7 . This is especially important in vehicle construction. Instead of a resilient fastening of parallel guide  2 , roller blind web  1  can also be tensioned in the weft direction by working in elastic threads. 
   The roller blind system and the roller blind web are described above as a woven fabric. However, the roller blind web can also be manufactured as a warp knitted fabric with the appropriate binding techniques.