Patent Publication Number: US-11391088-B2

Title: Roller blind assembly

Description:
TECHNICAL FIELD 
     This disclosure relates to implementations of a roller blind assembly for angled architectural openings. 
     BACKGROUND 
     Roller blinds are used to cover architectural openings, such as windows of a house, office building, or other structure. The roller blinds are used to provide shading, privacy, and/or other preferences by covering the architectural openings. 
     Roller blinds are designed to fit architectural openings by fitting around the perimeter or within the frame of the architectural openings. Roller blinds are designed to cover architectural openings by extending to fully cover the architectural openings. The roller blinds are also designed to retract to uncover the architectural openings. 
     Roller blinds include a roller and a sheet element. One end of the sheet element is attached to the roller. The sheet element rolls up around the roller when the roller blind is retracted. The sheet element unwinds and extends from the roller when the roller blind is extended. The sheet element is composed of a thin flexible material, such as fabric or plastic. 
     The roller of existing roller blinds is mounted at the top side of an architectural opening. Gravity assists to extend the sheet element downward as the sheet element is unwound from the roller. Gravity also assists to keep the unwound sheet element extended downward over the architectural opening. Thus, the weight of the sheet element, and in some designs an added weighting near the bottom end of the sheet element, is all that keeps the thin flexible sheet element extended over the architectural opening. 
     Existing roller blinds are rectangular shaped. Therefore, existing roller blinds are only able to fully fit and cover, as described above, rectangular shaped architectural openings. However, some architectural openings have a modified rectangular shape in which one side, such as the top or bottom side, of the architectural openings is angled so that this angled side is not parallel or perpendicular to the other sides. These architectural openings can be referred to as angled architectural openings. 
     Existing roller blinds are not able to fully fit and cover angled architectural openings, particularly when the angled side is at the top or bottom of the angled architectural openings. Furthermore, existing roller blinds can only properly extend and retract to fit and cover architectural openings when the roller is mounted at the top side of the architectural openings so that the sheet material extends vertically downward from the roller as described above. Therefore, existing roller blinds can not properly extend and retract to fit and cover architectural openings if the roller is mounted at the left or right side of the architectural openings so that the sheet material has to extend horizontally, such as to fit and cover angled architectural openings that have an angled top or bottom side. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1 a    illustrates a front side or interior side perspective view of an implementation of an example roller blind assembly according to the present disclosure with the roller blind sheet partially extended or retracted. 
         FIG. 1 b    illustrates a back side or exterior side view of the frame and other components of the roller blind assembly according to the present disclosure. 
         FIG. 1 c    illustrates a top side perspective view of the track assembly and other components of the roller blind assembly according to the present disclosure. 
         FIG. 2  illustrates another front side or interior side perspective view of the roller blind assembly according to the present disclosure with the roller blind sheet partially extended or retracted. 
         FIG. 3  illustrates another front side or interior side perspective view of the roller blind assembly according to the present disclosure with the roller blind sheet fully extended. 
         FIG. 4  illustrates a back side or exterior side perspective view of the frame and the outer frame of the roller blind assembly according to the present disclosure. 
         FIG. 5  illustrates a front side or interior side view of the frame and other components of the roller blind assembly according to the present disclosure. 
         FIG. 6  illustrates another back side or exterior side view of the frame and other components of the roller blind assembly according to the present disclosure. 
         FIGS. 7 a  and 7 b    illustrate a side view and a corresponding exploded perspective view respectively of a bottom portion of the roller tube assembly of the roller blind assembly according to the present disclosure. 
         FIGS. 8 a  and 8 b    illustrate an assembled and disassembled view respectively of the roller tube top bracket of the roller blind assembly according to the present disclosure. 
         FIG. 9  illustrates a perspective view of the roller sheet guide of the roller blind assembly according to the present disclosure. 
         FIG. 10  illustrates a front side or interior side view of the roller blind sheet of the roller blind assembly according to the present disclosure. 
         FIG. 11  illustrates another top side perspective view of the track assembly and other components of the roller blind assembly according to the present disclosure. 
         FIG. 12  illustrates a partial perspective view of the chain of the chain assembly of the roller blind assembly according to the present disclosure including the engaging extensions. 
         FIG. 13 a    illustrates a perspective view of the extended side extension track bracket of the track assembly of the roller blind assembly according to the present disclosure. 
         FIG. 13 b    illustrates a perspective view of the retracted side track assembly bracket of the track assembly of the roller blind assembly according to the present disclosure. 
         FIG. 13 c    illustrates a perspective view of the extended side retraction track bracket of the track assembly of the roller blind assembly according to the present disclosure. 
         FIGS. 14 a  and 14 b    illustrate side and bottom perspective views respectively of parts of the extension assembly of the roller blind assembly according to the present disclosure. 
         FIGS. 15 a  and 15 b    illustrate side and bottom perspective views respectively of the retraction assembly of the roller blind assembly according to the present disclosure. 
         FIGS. 16 a  and 16 b    illustrate a side perspective view and a corresponding exploded view respectively of the motor assembly of the roller blind assembly according to the present disclosure. 
         FIGS. 17 a  and 17 b    illustrate a perspective view of the retracted side limit switch and bracket and of the extended side limit switch and bracket respectively of the roller blind assembly according to the present disclosure. 
         FIGS. 18 a  and 18 b    illustrate a side view and a perspective view respectively of the power supply shelf of the roller blind assembly according to the present disclosure. 
         FIG. 19  illustrates a front side or interior side perspective view of an example angled architectural opening. 
         FIG. 20  illustrates a front side or interior side perspective view of the roller blind assembly according to the present disclosure installed in the example angled architectural opening. 
     
    
    
     DETAILED DESCRIPTION 
     Implementations of a roller blind assembly for angled architectural openings are provided. In some implementations, the roller blind assembly comprises a frame, a roller tube assembly, a roller blind sheet, a chain assembly, a track assembly, an extension assembly, a retraction assembly, and a motor assembly. 
     In some implementations, the roller blind assembly is configured to fully fit the perimeter of and also fully cover the opening of angled architectural openings. 
     In some implementations, the roller blind assembly is configured to extend, retract, and maintain the extension of a non-vertical roller blind such as a horizontally extending roller blind. 
     In some implementations, a method of using the roller blind assembly comprises installing the roller blind assembly to fully fit the perimeter of an angled architectural opening. In some implementations, the method comprises operating the roller blind assembly to fully cover the opening of the angled architectural opening. 
     As shown in  FIGS. 1 a -1 c   , in some implementations, the roller blind assembly  100  comprises a frame  110 , a roller tube assembly  120 , a roller blind sheet  130 , a chain assembly  140 , a track assembly  150 , an extension assembly  160 , a retraction assembly  170 , and a motor assembly  180 . 
     In some implementations, the roller blind assembly  100  can fully fit the perimeter of a window having a modified rectangular shape. In some implementations, the roller blind assembly  100  can also fully cover the opening of the window having the modified rectangular shape. 
     In some implementations, the top side of the window having the modified rectangular shape extends diagonally downward from a first (e.g., left) side to a second (e.g., right) side of the window. In some implementations, the top side of the window is non-perpendicular to the first side and the second side of the window. In some implementations, the top side of the window is non-parallel to the bottom side of the window. 
     In some implementations, the foregoing features of the top side of the window can be switched to the bottom side of the window so that the bottom side of the window is “angled” instead of the top side. 
     In some implementations, the above described window is an example of an angled architectural opening as referred to herein this description. In some implementations, an angled architectural opening as referred to herein is an architectural opening, such as a window (or window opening) of a house, office building, or other structure, that has a modified rectangular shape in which one side, such as the top or bottom side, is angled so that this angled side is not parallel or perpendicular to the other sides. In this regard,  FIG. 19  illustrates a front side or interior side perspective view of an example angled architectural opening  1900 . 
     As shown in  FIG. 1 b   , in some implementations, the frame  110  comprises a first (e.g., left) side  2   a , a bottom side  2   b , and a second (e.g., right) side  2   c . In some implementations, the first side  2   a  comprises a first side bottom end  2   a   1  and a first side top end  2   a   2 . In some implementations, the second side  2   c  comprises a second side bottom end  2   c   1  and a second side top end  2   c   2 . 
     In some implementations, the first side  2   a  extends vertically between the first side bottom end  2   a   1  and the first side top end  2   a   2 . In some implementations, the second side  2   c  extends vertically between the second side bottom end  2   c   1  and the second side top end  2   c   2 . 
     In some implementations, the bottom side  2   b  extends horizontally between and is connected respectively to the first side bottom end  2   a   1  and the second side bottom end  2   c   1 . 
     In some implementations, the frame  110  may further comprise a top side (not shown) that extends between the first side top end  2   a   2  and the second side top end  2   c   2 . 
     In some implementations, the first side  2   a  is longer than the second side  2   c.    
     In some implementations, the combination of the first side  2   a , the bottom side  2   b , and the second side  2   c  corresponds to the modified rectangular shape of the window so that the frame  110  can fully fit within or adjacent to the perimeter of the window. 
     For example, in some implementations, the shape of the frame  110  defined by the sides  2   a ,  2   b ,  2   c  corresponds to the modified rectangular shape of the window by the first side  2   a  of the frame  110  extending parallel to the first side of the window, the second side  2   c  of the frame  110  extending parallel to the second side of the window, and the bottom side  2   b  of the frame  110  extending parallel to the bottom side of the window. 
     In some implementations, the frame  110  is sized to fit within or adjacent to an existing frame of any other suitable angled architectural opening. 
     As shown in  FIGS. 1 a  and 1 b   , in some implementations, as described below, the roller tube assembly  120 , the chain assembly  140 , the track assembly  150 , and the motor assembly  180  are attached to the frame  110  within an interior of the frame  110 . In some implementations, the interior of the frame  110  extends between the first side  2   a , the bottom side  2   b , and the second side  2   c  of the frame  110 . 
     In some implementations, other components of the roller blind assembly  100  may also be attached within the interior of the frame  110 . 
     As shown in  FIGS. 4 and 5 , in some implementations, the first side  2   a , the bottom side  2   b , and the second side  2   c  of the frame  110  are each at least partially or substantially rectangular beam shaped. In some implementations, the sides  2   a ,  2   b ,  2   c  can be any other suitable shape. 
     As shown in  FIGS. 4-6 , in some implementations, hardware angle brackets  4  may be used to maintain the shape of the frame  110 . In some implementations, the brackets  4  may be used to connect the first frame side  2   a  and the bottom frame side  2   b . In some implementations, the brackets  4  may be used to connect the bottom frame side  2   b  and the second frame side  2   c.    
     In some implementations, the brackets  4  may be connected to the frame sides  2   a ,  2   b ,  2   c  with screws or similar fasteners. In some implementations, the screws may be long enough to help maintain a solid structural shape of the frame sides  2   a ,  2   b ,  2   c . In some implementations, the screws may not extend all of the way through the frame sides  2   a ,  2   b ,  2   c  and therefore may not be exposed in a top view of the frame  110 . 
     In some implementations, alternate references may be used herein with respect to the frame sides  2   a ,  2   b ,  2   c , or similar elements, such as retracted side  2   a  and extended side  2   c . However, it should be understood that such references refer to the same respective elements or other relative aspects based on the same reference number used. For example, in some implementations described herein, the first side  2   a  and the retracted side  2   a  refer to the same element. 
     Furthermore, retracted side or similar retracted references refer to the side on which the roller blind sheet  130 , described below, approaches or positions when fully retracted, e.g. the frame first side  2   a  with respect to the disclosure herein. Similarly, extended side or similar extended references refer to the side on which the roller blind sheet  130  approaches or positions when fully extended, e.g. the frame second side  2   c  with respect to the disclosure herein. 
     As shown in  FIG. 1 a   , in some implementations, the roller blind assembly  100  further comprises an outer molding or “outer frame”  115 . In some implementations, the outer frame  115  comprises an outer first (e.g., left) side  3   a , an outer second side  3   c , an outer top side  3   d , and an outer bottom side  3   b.    
     In some implementations, the combination of the sides  3   a ,  3   b ,  3   c ,  3   d  of the outer frame  115  form a modified rectangular shape. In some implementations, the modified rectangular shape is substantially congruent in length along each side to the length along each corresponding side  2   a ,  2   b ,  2   c  of the frame  110  of the roller blind assembly  100 . 
     For example, in some implementations, the sides  3   a ,  3   b ,  3   c ,  3   d  are connected together respectively to form a modified rectangular shape so that the outer first side  3   a  extends parallel and congruent in length with the first side  2   a  of the frame  110 , the outer second side  3   c  extends parallel and congruent in length with the second side  2   c  of the frame  110 , and the outer bottom side  3   b  extends parallel and congruent in length with the bottom side  2   b  of the frame  110 . 
     In some implementations, the outer frame  115  is attached to the frame  110  along each corresponding side  2   a ,  2   b ,  2   c  of the frame  110  respectively. 
     For example, in some implementations, the outer frame  115  is attached to the frame  110  so that the outer first side  3   a  is adjacent to the first side  2   a  of the frame  110 , the outer second side  3   c  is adjacent to the second side  2   c  of the frame  110 , and the outer bottom side  3   b  is adjacent to the bottom side  2   b  of the frame  110 . 
     In some implementations, the outer frame  115  at least partially conceals the other components of the roller blind assembly  100  that are attached or adjacent to the frame  110 . As shown in  FIG. 1 a   , in some implementations, the outer frame  115  at least partially conceals the other components when the roller blind assembly  100  is viewed toward the direction in which the outer frame  115  is attached to the frame  110 . 
     As shown in  FIGS. 3 and 4 , in some implementations, the outer frame sides  3   a ,  3   b ,  3   c ,  3   d  minimize the visibility of components of the roller blind assembly  100  from a viewer on the interior side  100   a  of the assembly  100 . In some implementations, the outer frame sides  3   a ,  3   b ,  3   c ,  3   d  provides for a transition between the roller blind assembly  100  and existing framework or molding around an angled architectural opening. 
     In some implementations, the materials, decorative design, staining or painting colors, and/or sheen of the outer frame sides  3   a ,  3   b ,  3   c ,  3   d  can be modified to match or complement the existing framework or molding of the angled architectural opening. 
     In some implementations, the sizing of the outer frame sides  3   a ,  3   b ,  3   c ,  3   d  is based on the amount of coverage required to minimize the visibility of the assembly  100  components from an interior viewpoint. In some implementations, the sizing of the outer frame sides  3   a ,  3   b ,  3   c ,  3   d  is based on the desired amount of molding for a transition to the existing framework or molding on the angled architectural opening. 
     In some implementations, the top outer frame side  3   d  also provides a path for heat to escape from the exterior side  100   b  of the roller blind assembly  100  out of the top side  100   c  of the assembly  100 . As shown in  FIG. 4 , in some implementations, a cutout  3   e  is cut in the top outer frame side  3   d  to provide this path. 
     In some implementations, the cutout  3   e  runs most or all of the length of a top portion of the top outer frame side  3   d . In some implementations, the cutout  3   e  runs from the very top of the top outer frame side  3   d  down to a point below the top framework or molding of the angled architectural opening (not shown). 
     In some implementations, heat that builds on the exterior side  100   b  of the roller blind sheet  130  rises toward the top side  100   c  of the roller blind assembly  100 . In some implementations, when the heat rises to the existing molding or framework of the angled architectural opening, the heat can escape through the cutout  3   e  and out of the top side  100   c  of the assembly  100 . 
     In some implementations, the heat can escape since the cutout  3   e  is cut to a point below the point of contact between the top outer frame side  3   d  and the existing molding or framework of the angled architectural opening. In some implementations, this flow path of heat through the cutout  3   e  minimizes the potential for damage caused by heat or the expansion of gasses to any material used to separate the interior from the exterior of the angled architectural opening, such as glass. 
     As introduced above, in some implementations, the frame  110  may further comprise a top side (not shown). In some implementations, such added top side includes a sufficient ventilation path for the escape of heat out of the top of the roller blind assembly  100 . 
     In some implementations, this ventilation flow path is aligned with the cutout  3   e  in the optional outer frame  115  of the assembly  100 . In some implementations, the ventilation flow path allows heat and heated gasses to escape from the exterior side  100   b  of the roller blind sheet  130  as described in the foregoing. 
     In some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , the cutout  3   e  is repositioned on the bottom outer frame side  3   b  instead of the top outer frame side  3   d.    
     In some implementations, the repositioned cutout  3   e  is started from above the point where the bottom outer frame side  3   b  meets the bottom frame side  2   b . In some implementations, this change in the design of the cutout  3   e  allows for the escape of heat and gases from the exterior side of the roller blind sheet  130  for such rotated assembly  100 . 
     As shown in  FIG. 1 b   , in some implementations, the roller tube assembly  120  comprises a cylindrical tube  5 . In some implementations, the roller tube assembly  120  is attached to the frame  110 . 
     In some implementations, the tube  5  extends vertically adjacent to the first side  2   a  of the frame  110 . In some implementations, the tube  5  is rotatably attached to the frame  110 . In some implementations, the tube  5  is rotatable about the longitudinal center of the tube  5 . 
     As shown in  FIGS. 5 and 6 , in some implementations, the roller tube  5  may be a hollow tube or pipe. In some implementations, the roller tube  5  may be cut slightly longer than the height of the roller blind sheet  130 . In some implementations, the roller tube  5  is cut to allow for a place where the roller tube top bracket  24  can maintain the position of the roller tube  5  without interfering with the roller blind sheet  130 . 
     In some implementations, the roller tube  5  can be a solid bar that is modified at the bottom side to accept the roller tube bottom attachment  22 , described below. 
     In some implementations, the roller tube  5  is held in place in a vertical alignment. In some implementations, the roller tube  5  is held along the frame retracted side  2   a  of the roller blind assembly  100 . In some implementations, the bottom side of the roller tube  5  is connected to a roller tube bottom attachment  22 . 
     As shown in  FIGS. 7 a  and 7 b   , in some implementations, the bottom attachment  22  sits in a hole  25 . In some implementations, the hole  25  is drilled into the frame bottom side  2   b  of the roller blind assembly  100 . 
     In some implementations, instead of the hole  25 , an additional bracket (not shown) can be used to house the bottom attachment  22  to hold the attachment  22  in place. In some implementations, this bracket can be connected to the frame bottom side  2   b  in many ways, such as by screw(s) or adhesive. 
     In some implementations, the hole  25  is large enough to allow the roller tube bottom attachment  22  to rotate freely about an axis that runs from the bottom to the top of the roller blind assembly  100 . In some implementations, the hole  25  is tight enough to minimize movement of the bottom attachment  22  away from the hole  25 . 
     As shown in  FIG. 4 , in some implementations, the hole  25  is positioned at a distance from the frame retracted side  2   a . In some implementations, the hole  25  is positioned at a far enough distance to prevent the frame retracted side  2   a  from interfering with the roller blind sheet  130  when coiled around the roller tube  5 . In some implementations, the hole  25  is positioned close enough to the frame retracted side  2   a  to maximize the view through the angled architectural opening when the roller blind sheet  130  is fully retracted. 
     In some implementations, the hole  25  is positioned to prevent the roller tube  5 , roller blind sheet  130 , bottom attachment  22 , or top bracket  24 , described below, from interfering with the original material inside the angled architectural opening, such as glass. In some implementations, the hole  25  is positioned to prevent the foregoing components from interfering with the outer frame sides  3   a ,  3   b  if included in the assembly  100 . 
     As shown in  FIG. 7 b   , in some implementations, the bottom portion  22   a  of the roller tube bottom attachment  22  is narrowed to fit into the hole  25 . In some implementations, the bottom portion  22   a  of the bottom attachment  22  is narrowed to minimize unnecessary friction between the bottom attachment  22  and the frame bottom side  2   b.    
     In some implementations, the hole  25  is deep enough to securely hold the roller tube bottom attachment  22  in place. In some implementations, the hole  25  is not so deep that the bottom portion  22   a  of the bottom attachment  22  is floating inside the hole  25 . 
     In some implementations, the attachment bottom portion  22   a  rests on the bottom of the hole  25 . In some implementations, the bottom portion  22   a  provides sufficient vertical force along the roller tube  5  to provide bottom support of the roller tube  5 . 
     As shown in  FIG. 7 b   , in some implementations, the roller tube bottom attachment  22  comprises a top section  22   b . In some implementations, the attachment top section  22   b  is sized to fit snuggly inside the hollow center of the roller tube  5 . 
     In some implementations, the connection between the roller tube  5  and the bottom attachment  22  at the top section  22   b  can be made in many ways, such as by a friction fit, adhesive, screw(s), nail(s), compression fit, or set screw(s). 
     In some implementations, the roller tube bottom attachment  22  connects to the bottom side of the roller tube  5  so that the bottom attachment  22  and the roller tube  5  both rotate together. In some implementations, rotation by the roller tube  5  causes the bottom attachment  22  to rotate in unison at the same angular velocity. Similarly, in some implementations, rotation by the bottom attachment  22  causes the roller tube  5  to rotate in unison at the same angular velocity. 
     As shown in  FIGS. 7 a  and 7 b   , in some implementations, the roller tube bottom attachment  22  comprises a flange  22   c . In some implementations, the flange  22   c  extends outward from the center of the bottom attachment  22 . 
     In some implementations, the flange  22   c  is located on the bottom attachment  22 . In some implementations, the flange  22   c  is located below the point where the top section  22   b  of the bottom attachment  22  extends into the roller tube  5 . 
     In some implementations, the flange  22   c  is sized to at least extend to the diameter of the roller blind sheet  130  when it is retracted and rolled onto the roller tube  5 . 
     In some implementations, the flange  22   c  provides a shelf support to the bottom of the roller blind sheet  130  when it is rolled onto the roller tube  5 . In some implementations, the shelf support provided by the flange  22   c  prevents the roller blind sheet  130  from falling from the roller tube  5 . 
     In some implementations, the shelf support provided by the flange  22   c  prevents the roller blind sheet  130  from interfering with other parts of the roller blind assembly  100 . 
     As shown in  FIGS. 7 a  and 7 b   , in some implementations, the roller tube assembly  120  comprises a tether attachment  23 . In some implementations, the tether attachment  23  positions over the bottom attachment  22  below the flange  22   c.    
     In some implementations, the tether attachment  23  couples the tether  16  to the bottom attachment  22 . 
     In some implementations, the tether attachment  23  has a cylindrical shape with a hollow center. In some implementations, the hollow center is large enough to fit over the main center section of the bottom attachment  22  between the flange  22   c  and the bottom portion  22   a.    
     In some implementations, the tether attachment  23  connects to the bottom attachment  22  by a screw  23   b  or other way of connection while positioned over the bottom attachment  22 . 
     In some implementations, the tether attachment  23  and the bottom attachment  22  are connected together to rotate in unison at the same angular velocity. In some implementations, the tether attachment  23  and the bottom attachment  22  therefore rotate in unison with the roller tube  5  connected to the bottom attachment  22 . Furthermore, in some implementations, the rotation of any one of the roller tube  5 , the bottom attachment  22 , or the tether attachment  23  therefore causes the rotation of the other foregoing connected components. 
     In some implementations, the tether  16  connects to the tether attachment  23  by the screw  23   b  or other way of connection. In some implementations, the tether  16  anchors to the head of the screw  23   b  to connect to the tether attachment  23 . 
     In some implementations, the tether  16  can be connected to the tether attachment  23  by the screw  23   b  in many ways, such as by tying or pinning the tether  16 . 
     As shown in  FIGS. 7 a  and 7 b   , in some implementations, the tether attachment  23  comprises a lower flange  23   a.    
     In some implementations, the lower flange  23   a  is small enough to allow the tether attachment  23  and the bottom attachment  22  to position between the retracted side  2   a  and the retracted side bracket  12 , described below, without causing interference with other parts of the roller blind assembly  100 . 
     In some implementations, the lower flange  23   a  provides a shelf support to the tether  16  when it is rolled onto the tether attachment  23 . 
     In some implementations, the shelf support provided by the lower flange  23   a  prevents the tether  16  from falling from the tether attachment  23 . In some implementations, the shelf support provided by the lower flange  23   a  prevents the tether  16  from interfering with other parts of the roller blind assembly  100 , such as becoming entangled in the chain  9  or sprocket  28 , described below. 
     In some implementations, the tether attachment  23  and the bottom attachment  22  may be integrated as a single part. 
     As shown in  FIGS. 5 and 6 , in some implementations, the top of the roller tube  5  is held in place by a roller tube top bracket  24 . In some implementations, the top bracket  24  is connected to the frame retracted side  2   a  near the top of the roller tube  5 . 
     In some implementations, the top bracket  24  can be connected to the frame retracted side  2   a  in various ways, such as by screw(s), nail(s), or adhesive. 
     In some implementations, the top bracket  24  is positioned high enough on the roller tube  5  to prevent any interference with the roller blind sheet  130 . 
     In some implementations, the top bracket  24  comprises a cylindrical opening that fits around the roller tube  5 . In some implementations, the roller tube  5  can rotate freely inside this cylindrical opening with very little friction or resistance from the roller tube top bracket  24 . 
     In some implementations, the top bracket  24  prevents the top of the roller tube  5  from moving away from the top bracket  24 . 
     As shown in  FIGS. 8 a  and 8 b   , in some implementations, the top bracket  24  comprises two sections  24   a ,  24   b . In some implementations, the sections  24   a ,  24   b  can be connected and separated for ease of installation or removal of the roller tube  5  from the roller blind assembly  100 . 
     In some implementations, the first or stationary section  24   a  comprises a cutout portion. In some implementations, the cutout is wide enough to allow the top portion of the roller tube  5  to slide out of the top bracket  24 . In some implementations, the cutout allows the roller tube  5  to slide out of the top bracket  24  when the second or removable section  24   b  is separated from the stationary section  24   a.    
     As shown in  FIG. 8 b   , in some implementations, the stationary section  24   a  comprises multiple extensions  24   c . In some implementations, the extensions  24   c  fit snuggly into holes  24   d  in the removable section  24   b . In some implementations, the extensions  24   c  hold the removable section  24   b  in place and prevent movement away from the top bracket  24 . 
     In some implementations, the extensions  24   c  fit snuggly enough in the holes  24   d  to prevent separation of the removable section  24   b  from the stationary section  24   a , such as during operation of the roller blind assembly  100 . 
     In some implementations, the removable section  24   b  can be attached to the stationary section  24   a  to assemble the bracket  24  in various ways, such as by screws, nuts and bolts, adhesive, or hinges. 
     As introduced above, in some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , an additional bracket (not shown) is mounted at the top side of the roller tube  5 . In some implementations, this additional bracket is connected to the frame retracted side  2   a  similar to how the top bracket  24  is connected to the frame retracted side  2   a.    
     In some implementations, such additional bracket comprises a shelf portion (not shown). In some implementations, this shelf portion is positioned at the top side of the roller tube  5 . In some implementations, for such rotated assembly  100 , this shelf portion prevents the roller tube  5  from being pulled downward, e.g. by gravity, from the assembly  100 . 
     In some implementations, for such rotated assembly  100 , the top bracket  24  is rotated so that the removable section  24   b  positions on top of the stationary section  24   a.    
     As shown in  FIGS. 1 b    and  9 , in some implementations, the roller tube assembly  120  further comprises a roller sheet guide  26 . 
     In some implementations, the guide  26  is attached to the first side  2   a  of the frame  110 . In some implementations, the guide  26  is attached adjacent to the tube  5  of the roller tube assembly  120 . In some implementations, the guide  26  is attached at a mid-length of the tube  5 . 
     In some implementations, the guide  26  comprises a curved portion  26   c  that partially extends around and adjacent to the tube  5 . 
     In some implementations, the guide  26  guides and maintains the roller blind sheet  130  firmly around the tube  5  as the roller blind sheet  130  is retracted and rolled up around the tube  5 . 
     As shown in  FIG. 6 , in some implementations, the guide  26  is positioned midway up from the frame bottom side  2   b  with respect to the roller tube  5 . For example, in some implementations, the guide  26  is positioned approximately one-third to one-half of the way up the roller tube  5  from the frame bottom side  2   b.    
     In some implementations, the guide  26  is attached to the frame retracted side  2   a.    
     In some implementations, the guide  26  can be attached to the frame retracted side  2   a  in various ways, such as by screws, nails, or adhesive. 
     As shown in  FIG. 9 , in some implementations, the guide  26  comprises a curved flange  26   c  that mirrors the outside shape of the roller tube bottom attachment flange  22   c . In some implementations, this curved flange  26   c  is positioned adjacent to the exterior side  100   b  of the roller guide assembly  100 . 
     In some implementations, the curved flange  26   c  of the guide  26  is connected to another set of flanges  26   a ,  26   b . In some implementations, these flanges  26   a ,  26   b  allow the curved flange  26   c  of the guide  26  to be positioned to compliment the outer edge of the bottom attachment flange  22   c.    
     In some implementations, the guide  26  is attached to the frame retracted side  2   a  at the retracted side flange  26   a  of the guide  26 . In some implementations, the guide  26  can be attached to the frame retracted side  2   a  in various ways, such as by screws, nails, or adhesive. 
     In some implementations, the guide  26  forces the roller blind sheet  130  back toward the center axis of the roller tube  5  in the event that the roller blind sheet  130  becomes loose around the roller tube  5 . In some implementations, this helps minimize the potential that the roller blind sheet  130  will fall below or to the bottom side of the bottom attachment flange  22   c  and interfere with other parts of the roller blind assembly  100 . 
     As shown in  FIG. 10 , in some implementations, the roller blind sheet  130  comprises a top edge  130   d , a bottom edge  130   b , a first (e.g., left) edge  130   a , and a second (e.g., right) edge  130   c.    
     In some implementations, the edges  130   a ,  130   b ,  130   c ,  130   d  define a shape of the roller blind sheet  130  that corresponds to the modified rectangular shape of the window described above. In some implementations, the shape of the roller blind sheet  130  corresponds to the shape of the window so that the roller blind sheet  130  can fully cover the opening of the window. 
     In some implementations, the first edge  130   a  is longer than the second edge  130   c.    
     In some implementations, the first edge  130   a  is attached to the tube  5  of the roller tube assembly  120  so that the roller blind sheet  130  can be rolled up around the tube  5 . In some implementations, the roller blind sheet  130  can be rolled up around the tube  5  to uncover the opening of the window. 
     In some implementations, the first edge  130   a  is attached to the tube  5  of the roller tube assembly  120  so that the roller blind sheet  130  can be unrolled and extended from the tube  5 . In some implementations, the roller blind sheet  130  can be unrolled and extended from the tube  5  to fully cover the opening of the window. 
     In some implementations, the roller blind sheet  130 , when fully extended from the roller tube  5 , comprises the shape of the angled architectural opening in which the roller blind assembly  100  is installed. In some implementations, the fully extended roller blind sheet  130  comprises any other desired shape of coverage with respect to the angled architectural opening. 
     In some implementations, the top edge  130   d  of the roller blind sheet  130  is cut parallel to, but slightly below, the top edge of the angled architectural opening. In some implementations, this shaping of the roller blind sheet  130  allows a path for heat and heated gasses to escape from the exterior side  100   b  of the roller blind sheet  130  and out the top side  100   c  of the roller blind assembly  100 . 
     In some implementations, the roller blind sheet  130  comprises additional material on the roller tube side, or retracted side,  130   a  of the roller blind sheet  130  to allow for the attachment of the roller blind sheet  130  to the roller tube  5 . 
     In some implementations, the roller blind sheet  130  can be attached to the roller tube  5  at this additional material in various ways, such as by tape, glue, staples, screws, or nails. 
     In some implementations, this additional material of the roller blind sheet  130  that attaches to the roller tube  5  wraps at least partially around the roller tube  5  when the roller blind sheet  130  is fully extended from the roller tube  5 . 
     In some implementations, the top edge  130   d  of the roller blind sheet  130  is stiff to horizontally support the roller blind sheet  130  when extended from the tube  5 . 
     In some implementations, the top edge  130   d  of the roller blind sheet  130  is flexible to allow the roller blind sheet  130  to roll up around the tube  5  when retracted. 
     As shown in  FIG. 10 , in some implementations, the roller blind sheet  130  further comprises a narrow elongated sleeve  1   a  and a thin narrow elongated piece of material  132 . 
     In some implementations, the narrow elongated sleeve  1   a  is adjacent to the top edge  130   d  of the roller blind sheet  130 . 
     In some implementations, roller blind sheet  130  comprises additional material on the angled side, e.g. the top side  130   d , of the roller blind sheet  130 . In some implementations, this additional material is folded over and attached to the roller blind sheet  130  to form the sleeve  1   a.    
     In some implementations, the folded over additional material can be attached to the roller blind sheet  130  to form the sleeve  1   a  in various ways, such as by sewing, glue, snaps, buttons, staples, or nuts and bolts. 
     In some implementations, the sleeve  1   a  extends at least partially along the angled side  130   d  of the roller blind sheet  130 . 
     In some implementations, the sleeve  1   a  extends along all of the angled side  130   d  of the roller blind sheet  130 , including along the additional material of the roller blind sheet  130  that attaches to the roller tube  5  as described above. Therefore, in some implementations, the sleeve  1   a  wraps at least partially around the roller tube  5  when the roller blind sheet  130  is fully extended. 
     In some implementations, the piece of material  132  is held within the sleeve  1   a.    
     In some implementations, the piece of material  132  provides a stiff horizontal support to the roller blind sheet  130  when extended from the tube  5  of the roller tube assembly  120 . 
     In some implementations, the piece of material  132  provides a flexibility that allows the roller blind sheet  130  to roll up around the tube  5  when the roller blind sheet  130  is retracted. 
     In some implementations, the sleeve  1   a  houses the piece of material  132 . 
     In some implementations, the piece of material  132  supports the roller blind sheet  130  along the top side and/or the angled side of the roller blind sheet  130 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  provides stability to the top edge and/or the angled edge of the roller blind sheet  130 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  prevents sagging of the roller blind sheet  130  when extended from the roller tube  5 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  is sufficiently flexible and resilient to roll up and wrap around the roller tube  5  and to straighten out and extend from the roller tube  5 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  rolls up and wraps around the roller tube  5  along with the material of the roller blind sheet  130 , including the additional material that is attached to the roller tube  5 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  wraps around the roller tube  5  as the roller blind sheet  130  is retracted and wrapped around the roller tube  5 . 
     In some implementations, the piece of material  132  in the sleeve  1   a  straightens out and extends with the roller blind sheet  130  as the roller blind sheet  130  is unwrapped and extended from the roller tube  5 . 
     In some implementations, the piece of material  132  may be a thin piece of metal material. 
     Considering the foregoing description, in some implementations, the piece of material  132  in the sleeve  1   a  behaves similar to a length of retractable tape measure material that is stored coiled inside a tape measure housing and that extends straight when withdrawn from the housing. 
     As shown in  FIG. 10 , in some implementations, the roller blind sheet  130  further comprises a narrow elongated sleeve  1   b . In some implementations, the narrow elongated sleeve  1   b  is adjacent to the second edge  130   c  of the roller blind sheet  130 . 
     In some implementations, a narrow elongated finger (also referred to herein as an extension rod)  7 , which extends upward from the extension assembly  160  as described below, is inserted in the sleeve  1   b  to connect the extension assembly  160  to the roller blind sheet  130 . 
     In some implementations, the roller blind sheet  130  comprises additional material on the extended side  130   c  of the roller blind sheet  130 . In some implementations, this additional material is folded over and attached to the roller blind sheet  130  to form the second sleeve  1   b.    
     In some implementations, the folded over additional material can be attached to the roller blind sheet  130  to form the sleeve  1   b  in various ways, such as by sewing, glue, snaps, buttons, staples, or nuts and bolts. 
     In some implementations, the sleeve  1   b  extends vertically along the extended side  130   c  of the roller blind sheet  130 . 
     In some implementations, the sleeve  1   b  extends at least partially along the extended side  130   c  of the roller blind sheet  130 . 
     As shown in  FIG. 10 , in some implementations, the bottom portion of the sleeve  1   b  on the extended side  130   c  of the roller blind sheet  130  is further attached to the roller blind sheet  130  along a vertical attachment line  1   c  to form two smaller sleeves  1   d ,  1   e . In some implementations, the two smaller sleeves  1   d ,  1   e  are formed at the bottom of the extended side of the roller blind sheet  130 . 
     In some implementations, the smaller sleeves  1   d ,  1   e  can be formed in various ways, such as by sewing, glue, snaps, buttons, staples, or nuts and bolts. 
     In some implementations, the extension rod  7  positioned inside the sleeve  1   b  is further positioned inside the retracted side sleeve  1   e  that is formed in the bottom portion of the sleeve  1   b.    
     In some implementations, the positioning of the rod  7  in the retracted side sleeve  1   e  causes a tighter fit between the sleeve  1   e  and the bottom portion of the extension rod  7  close to the extension assembly  160 . 
     In some implementations, the positioning of the rod  7  in the retracted side sleeve  1   e  causes a looser fit between the sleeve  1   b  and the top portion of the extension rod  7 . 
     In some implementations, the tighter fit between the retracted side sleeve  1   e  and the bottom of the extension rod  7  minimizes the torque created on the extension assembly  160  about an axis through the extension assembly  160  perpendicular to the extension track  8 , described below. 
     In some implementations, the tighter fit between the sleeve  1   e  and the extension rod  7  minimizes the torque as the extension assembly  160  is pushed by the engaging extension  9   a  to extend the roller blind. In some implementations, the tighter fit between the sleeve  1   e  and the extension rod  7  minimizes the torque when the extension assembly  160  is pulled back toward the roller tube  5  as the roller blind sheet  130  is retracted onto the roller tube  5 . 
     In some implementations, the top portion of the sleeve  1   b  on the extended side  130   c  of the roller blind sheet  130  fits more loosely around the top of the extension rod  7  when compared to the smaller sleeve  1   e  at the bottom of the extension rod  7 . 
     In some implementations, this allows the top portion of the extension rod  7  to provide structural support to the roller blind sheet  130 . In some implementations, this allows the top portion of the extension rod  7  to prevent the roller blind sheet  130  from falling from the extension rod  7 . In some implementations, structural support is therefore created for the extended side  130   c  of the roller blind sheet  130  by the extension rod  7 . 
     In some implementations, the tube  5  of the roller tube assembly  120  and the attached roller blind sheet  130  may be integrated or combined as a single component, such as or similar to a roller blind. 
     In some implementations, the roller blind sheet  130  may be any flexible material that can be used to cover an angled architectural opening and can wrap around a roller tube  5  when retracted. 
     In some implementations, the roller blind sheet  130  may be any material that can be used to completely, substantially, partially, or minimally block out light, a view, and/or radiant or heat energy from traversing through an angled architectural opening. 
     In some implementations, the roller blind sheet  130  may be a material that is referred to as blinds, shades, coverings, solar shades, or solar blinds. 
     Although parts of the sleeves  1   a ,  1   b ,  1   d ,  1   e  such as the attachment  1   c , flaps, seams, etc. are shown in  FIG. 10  for description purposes, in some implementations, such parts of the sleeves  1   a ,  1   b ,  1   d ,  1   e  may be hidden or otherwise not visible, e.g. on one or both sides of the roller blind sheet  130 . 
     As shown in  FIGS. 1 c    and  12 , in some implementations, the chain assembly  140  comprises a chain  9 . In some implementations, the chain assembly  140  is attached to the frame  110 . 
     In some implementations, the chain  9  comprises a roller type chain. In some implementations, the chain  9  comprises any other suitable type of chain. 
     In some implementations, the chain  9  extends in a horizontal loop between the first side  2   a  and the second side  2   c  of the frame  110  adjacent to the bottom side  2   b  of the frame  110 . In some implementations, the horizontal loop in which the chain  9  extends is elliptical shaped. 
     In some implementations, the horizontal loop in which the chain  9  extends has any other suitable shape. 
     In some implementations, the chain  9  is moveable along the horizontal loop. In some implementations, the chain  9  travels around the track assembly  150 . 
     In some implementations, the chain  9  comprises a first engaging extension  9   a  and a second engaging extension  9   b.    
     As shown in  FIG. 12 , in some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  each comprise a substantially rectangular shaped plate. In some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  may each comprise a plate having any other suitable shape. 
     In some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  may each comprise any other suitable configuration, such as a finger of any suitable shape. 
     In some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  are each attached to the chain  9 . In some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  each extend from the chain  9 . 
     In some implementations, the first engaging extension  9   a  and the second engaging extension  9   b  are attached to the chain  9  so that the extensions  9   a ,  9   b  can position and extend from the chain  9  on a same side or on different sides of the horizontal loop of travel of the chain  9  during operation of the assembly  100 . 
     In some implementations, the chain  9  may comprise just a single engaging extension instead of the two extensions  9   a ,  9   b . In some implementations, such single engaging extension is the same or similar to either of the extensions  9   a ,  9   b . In some implementations, such single engaging extension can provide essentially the same or substantially similar function as the two extensions  9   a ,  9   b  for the operation of the roller blind assembly  100  as described below. 
     As shown in  FIGS. 7 a -7 b  and 16 a -16 b   , in some implementations, the chain assembly  140  may comprise two sprockets  28 ,  30 . In some implementations, the sprockets  28 ,  30  allow the chain  9  to move in the travel path on the roller blind assembly  100 . 
     In some implementations, the first sprocket  28  may be a plate sprocket. 
     In some implementations, the first sprocket  28  is positioned near the roller tube  5 . As shown in  FIGS. 7 a  and 7 b   , in some implementations, the first sprocket  28  is positioned near the base of the roller tube bottom attachment  22 . 
     In some implementations, the first sprocket  28  rotates freely around the bottom attachment  22 . 
     In some implementations, the movement of the chain  9  controls the rotation of the first sprocket  28 . In some implementations, the rotation of the first sprocket  28  does not cause the bottom attachment  22  or the roller tube  5  to rotate. 
     Similarly, in some implementations, the rotation of the roller tube  5  or the bottom attachment  22  does not cause the first sprocket  28  to rotate. In some implementations, the first sprocket  28  is positioned on top of a bushing  29 . In some implementations, the bushing  29  is positioned on the frame bottom side  2   b.    
     In some implementations, the bushing  29  prevents the first sprocket  28  from interfering with the frame bottom side  2   b . Similarly, in some implementations, the bushing  29  prevents the chain  9  from interfering with the frame bottom side  2   b  as the chain  9  rotates around the first sprocket  28 . 
     In some implementations, the bushing  29  is positioned around the center cylinder of the roller tube bottom attachment  22 . In some implementations, the position of the bushing  29  prevents the movement of the bushing  29  away from the bottom attachment  22 . 
     As introduced above, in some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , another bushing that is like the bushing  29  is positioned along the rotational axis of the roller tube bottom attachment  22  adjacent to the top side of the sprocket  28 . 
     In some implementations, for such rotated assembly  100 , this additional bushing prevents gravity from pulling the sprocket  28  against the lower flange  23   a  of the roller tube bottom attachment  22 . In some implementations, this additional bushing also prevents interference between the lower flange  23   a  and the chain  9  or engaging extensions  9   a ,  9   b.    
     As shown in  FIGS. 16 a  and 16 b   , in some implementations, the second sprocket  30  is positioned near the frame bottom side  2   b  on the extended side  2   c  of the roller blind assembly  100 . In some implementations, the second sprocket  30  is positioned on top of a bracket  31 . 
     As shown in  FIG. 16 b   , in some implementations, the bracket  31  comprises a raised cylindrical section  31   a . In some implementations, the second sprocket  30  is positioned on top of the cylindrical section  31   a.    
     In some implementations, the cylindrical section  31   a  raises the sprocket  30  off of the bracket  31 . In some implementations, the cylindrical section  31   a  prevents interference between the sprocket  30  and the frame bottom side  2   b.    
     In some implementations, the bracket  31  comprises a second raised cylindrical section  31   b . In some implementations, the second cylindrical section  31   b  is positioned on top of the first cylindrical section  31   a.    
     In some implementations, the second cylindrical section  31   b  is large enough to prevent excess movement of the sprocket  30  away from the bracket  31 . 
     In some implementations, the second cylindrical section  31   b  is small enough to allow the sprocket  30  to rotate freely on the bracket  31  with minimal friction between the bracket  31  and the sprocket  30 . 
     In some implementations, the bracket  31  prevents the sprocket  30  from interfering with the frame bottom side  2   b . Similarly, in some implementations, the sprocket  30  prevents the chain  9  from interfering with the frame bottom side  2   b  as the chain  9  rotates around the sprocket  30 . 
     In some implementations, the bracket  31  is connected to the frame bottom side  2   b.    
     In some implementations, the bracket  31  can be attached to the frame bottom side  2   b  in various ways, such as by screws, nails, or adhesives. 
     As shown in  FIG. 16 b   , in some implementations, attachment points for the bracket  31  are aligned with attachment points on the retraction track bracket  15  on the extended side  2   c  of the roller blind assembly  100 . In some implementations, this is for easier assembly and alignment of components of the assembly  100  to prevent interference during operation. 
     As shown in  FIGS. 16 a  and 16 b   , in some implementations, the second sprocket  30  may be directly coupled to an attachment  34  that extends from the shaft of a motor  32 , described below. In some implementations, the sprocket  30  may be a finished bore sprocket. 
     As shown in  FIG. 1 c   , in some implementations, the track assembly  150  comprises an extension track  8  and a retraction track  14 . 
     In some implementations, the extension track  8  and the retraction track  14  each extend between the first side  2   a  and the second side  2   c  of the frame  110 . In some implementations, the extension track  8  and the retraction track  14  each extend adjacent to the bottom side  2   b  of the frame  110 . 
     As shown in  FIG. 11 , in some implementations, the extension track  8  and the retraction track  14  each comprise a pair of rods  8   a ,  8   b ,  14   a ,  14   b  respectively extending between the first side  2   a  and the second side  2   c  of the frame  110 . 
     In some implementations, the extension track  8  is positioned near the bottom of the roller blind assembly  100  and extends between the retracted side  2   a  and the extended side  2   c  of the assembly  100 . 
     In some implementations, the extension track  8  can be made from various different designs and materials. In some implementations, the extension track  8  comprises rods  8   a ,  8   b.    
     In some implementations, the extension track rods  8   a ,  8   b  are held above the frame bottom side  2   b  of the roller blind assembly  100 . As shown in  FIG. 11 , in some implementations, the rods  8   a ,  8   b  are held in place by brackets  11 ,  12 . 
     As shown in  FIG. 13 a   , in some implementations, the extended side bracket  11  comprises two hollow cylinder openings  11   a . In some implementations, the track rods  8   a ,  8   b  fit snuggly into the openings  11   a.    
     In some implementations, the extended side extension track bracket  11  comprises two attachment extensions  11   b . In some implementations extensions  11   b  comprise holes that allow the extended side bracket  11  to be attached to the frame extended side  2   c . In some implementations, attaching the extended side bracket  11  to the frame extended side  2   c  allows for maximum travel of the extension cart  6  toward the extended side  2   c.    
     In some implementations, the extended side bracket  11  can be attached to the assembly frame extended side  2   c  in various ways such as by screws or adhesive. 
     As shown in  FIG. 13 b   , in some implementations, the retracted side track assembly bracket  12  comprises two hollow cylinder openings  12   a . In some implementations, the hollow cylinder openings  12   a  are the same or similar to the above described hollow cylinder openings  11   a  of the extended side bracket  11 . 
     In some implementations, for ease of positioning or removal of the extension track rods  8   a ,  8   b , a top portion of the hollow cylinder openings  12   a  is omitted. In some implementations, this variation of the hollow cylinder openings  12   a  allows the track rods  8   a ,  8   b  to be positioned in or removed from the hollow cylinder openings  12   a  while positioned in the other hollow cylinder openings  11   a  with the brackets  11 ,  12  attached to the roller blind assembly  100 . 
     In some implementations, the retracted side bracket  12  also comprises an attachment extension flange  12   b . In some implementations, the attachment flange  12   b  comprises holes that allow the retracted side bracket  12  to be attached to the frame bottom side  2   b.    
     In some implementations, the retracted side bracket  12  can be attached to the frame bottom side  2   b  in various ways such as by screws or adhesive. 
     In some implementations, the retracted side track assembly bracket  12  may comprise two additional hollow cylinder openings  12   c . In some implementations, these additional hollow cylinder openings  12   c  may have a half cylinder shape variation similar to the above described variation of the hollow cylinder openings  12   a.    
     As shown in  FIG. 11 , in some implementations, the additional hollow cylinder openings  12   c  hold the retracted side of the retraction track  14  used for the travel of the retraction cart  13 , as described below. 
     In some implementations, the retraction track  14  can be made from various different designs and materials. In some implementations, the retraction track  14  comprises two rods  14   a ,  14   b.    
     In some implementations, the retraction track  14  is positioned near the bottom of the roller blind assembly  100  and extends along the extend/retract axis. 
     In some implementations, the retraction track rods  14   a ,  14   b  are held above the frame bottom side  2   b  of the roller blind assembly  100 . As shown in  FIG. 11 , in some implementations, the rods  14   a ,  14   b  are held in place by brackets  12 ,  15 . 
     As shown in  FIG. 13 c   , in some implementations, the extended side retraction track bracket  15  comprises two hollow cylinder openings  15   a . In some implementations, the track rods  14   a ,  14   b  fit snuggly into the openings  15   a.    
     As shown in  FIG. 16 b   , in some implementations, the bracket  15  is attached to the frame bottom side  2   b  on top of the bracket  31  of the chain assembly  140  and/or the motor assembly  180 . 
     In some implementations, the bracket  15  can be attached to the frame bottom side  2   b  in various ways such as by screws, nails, or adhesive. 
     In some implementations, the retracted side  2   a  of the retraction track rods  14   a ,  14   b  are held in place by the retracted side bracket  12 , introduced above with respect to the extension track  8 . 
     As shown in  FIG. 13 b   , in some implementations, in addition to what is described above, the bracket  12  further comprises a flange  12   d . In some implementations, the flange  12   d  extends toward the exterior side  100   b  of the roller blind assembly  100 . 
     In some implementations, the flange  12   d  positions below the tether  16 . In some implementations, the flange  12   d  helps to prevent the tether  16  from interfering with the chain  9 , engaging extensions  9   a ,  9   b , and sprocket  28  in the event that the tether  16  becomes slack during operation of the roller blind assembly  100 . 
     In some implementations, the flange  12   d , along with the body of the bracket  12 , helps guide the tether  16  and prevent excess travel of the tether  16  away from the roller blind assembly  100 . 
     In some implementations, the flange  12   d  also helps to maintain the tether  16  above the tether attachment flange  23   a  in the event that the tether  16  becomes slack during operation of the roller blind assembly  100 . 
     In some implementations, the retracted side bracket  12  may comprise separate brackets (not shown) for the extension track rods  8   a ,  8   b  and for the retraction track rods  14   a ,  14   b.    
     As introduced above, in some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , the hollow cylinder openings  12   a ,  12   c  of the bracket  12  with top portions omitted are rotated, e.g., flipped, to prevent gravity from pulling the track rods  8   a ,  8   b ,  14   a ,  14   b  out of the openings  12   a ,  12   c  respectively. 
     In some implementations, a hardware screw eye (not shown) is positioned toward the retracted side  2   a  of the roller blind assembly  100  adjacent to the bracket  12 . In some implementations, the screw eye is also positioned near the tether attachment flange  23   a . In some implementations, the tether  16  extends through the screw eye and then over the bracket flange  12   d.    
     In some implementations, the screw eye guides the tether  16 . In some implementations, the screw eye prevents the tether  16  from interfering with other components of the roller blind assembly  100 . 
     In some implementations, the screw eye also prevents excess movement of the tether  16  away from the roller blind assembly  100 . 
     In some implementations, the tether  16  can be guided in other ways that are similar to the screw eye, such as described herein. 
     As shown in  FIG. 1 c   , in some implementations, the extension assembly  160  is moveably connected to the extension track  8 . In some implementations, the extension assembly  160  can move along the extension track  8  between the first side  2   a  and the second side  2   c  of the frame  110 . 
     In some implementations, the extension assembly  160  is engageably coupleable to the chain  9  by the body  6  of the extension assembly  160 . In some implementations, a movement of the first engaging extension  9   a  toward the extension assembly  160  by a movement of the chain  9  causes the first engaging extension  9   a  to engage the body  6  of the extension assembly  160 . In some implementations, the movement of the first engaging extension  9   a  causes the chain  9  to couple to the extension assembly  160  to move the extension assembly  160  along the extension track  8 . 
     As shown in  FIG. 1 a   , in some implementations, the extension assembly  160  is connected to the roller blind sheet  130  by the rod  6   c ,  7  of the extension assembly  160  adjacent to the second edge  130   c  of the roller blind sheet  130 . In some implementations, a movement of the extension assembly  160  along the extension track  8  by the chain  9  causes an unrolling of the roller blind sheet  130  from the tube  5 . In some implementations, the movement of the extension assembly  160  causes an extending of the roller blind sheet  130  horizontally across the frame  110 . 
     As shown in  FIG. 1 c   , in some implementations, the extension assembly  160  further comprises a narrow elongated finger (also referred to herein as an extension rod)  7 , described more below. In some implementations, the finger  7  extends upward from the extension assembly  160 . 
     As shown in  FIG. 1 a   , in some implementations, the finger  7  is inserted in the sleeve  1   b  of the roller blind sheet  130 , described above, to connect the extension assembly  160  to the roller blind sheet  130 . 
     As shown in  FIGS. 11 and 14   a - 14   b , in some implementations, the extension assembly  160  comprises a substantially rectangular prism shaped body  6  having a pair of openings  6   a ,  6   b  extending therethrough and a rod  6   c ,  7  extending therefrom, as described herein. In some implementations, the body  6  has any other suitable shape. 
     In some implementations, the extension assembly  160  comprises an extension cart  6  and an extension rod  7 . 
     In some implementations, the extension cart  6  is moveably connected to the extension track  8  of the track assembly  150 . 
     In some implementations, the extension rod  7  is attached to and extends from the extension cart  6 . 
     In some implementations, the extension rod  7  can be attached or otherwise connected to the extension cart  6  in various ways, such as by screw(s), set screw(s), an adhesive, or a friction fit. 
     As shown in  FIG. 2 , in some implementations, the sleeve  1   b  positions over the extension rod  7 . 
     In some implementations, the extension rod  7  on the extension cart  6  provides support to the extended side  130   c  of the roller blind sheet  130 . 
     In some implementations, the extension rod  7  on the extension cart  6  prevents the extended side  130   c  of the roller blind sheet  130  from falling from the extension rod  7 . 
     In some implementations, the bottom of the sleeve  1   b  sits on top of the extension cart  6 , which prevents the roller blind sheet  130  from falling from the extension rod  7 . 
     In some implementations, the positioning of the sleeve  1   b  onto the extension rod  7  adjacent to the extension cart  6  couples or connects the roller blind sheet  130  to the extension cart  6 . 
     In some implementations, as the extension cart  6  is pushed or otherwise moves along the track  8 , the extension rod  7  on the extension cart  6  pulls and extends the roller blind sheet  130  over an angled architectural opening to which the roller blind assembly  100  is attached. 
     Similarly, in some implementations, as the roller tube  5  is rotated or otherwise turns to retract the roller blind sheet  130 , the roller blind sheet  130  is pulled or otherwise retracted from over the angled architectural opening. In some implementations, as the roller blind sheet  130  is retracted, the roller blind sheet  130  pulls the extension rod  7  by the connection to the sleeve  1   b , which thereby pulls the extension cart  6  toward the roller tube  5 . 
     As shown in  FIGS. 14 a  and 14 b   , in some implementations, the extension cart  6  comprises two openings (“holes”)  6   a ,  6   b . In some implementations, the two rods  8   a ,  8   b  that form the track  8  for the extension cart  6  fit respectively into the two holes  6   a ,  6   b  in the extension cart  6 . 
     In some implementations, the fit between the two holes  6   a ,  6   b  in the extension cart  6  and the track rods  8   a ,  8   b  is tight enough to prevent any excess movement of the extension cart  6  away from the track  8 . In some implementations, the fit between the holes  6   a ,  6   b  and the rods  8   a ,  8   b  is loose enough to allow the extension cart  6  to slide smoothly along the track rods  8   a ,  8   b.    
     In some implementations, the shape of the extension cart  6  is designed to hold the extension rod  7  in a vertical position. As shown in  FIGS. 11 and 14   a - 14   b , in some implementations, the extension cart  6  comprises a hollow cylinder  6   c  on the top side of the extension cart  6 . In some implementations, the hollow portion of the cylinder  6   c  is sized to snuggly hold the extension rod  7  to thereby couple the extension rod  7  and the extension cart  6  together. 
     In some implementations, movement of the extension cart  6  therefore causes corresponding movement of the extension rod  7 . In some implementations, movement of the extension rod  7  therefore causes corresponding movement of the extension cart  6 . 
     As introduced above, in some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , additional ways of attachment can be used to prevent gravity from detaching the extension rod  7  from the extension cart  6  and from pulling the roller blind sleeve  1   b ,  1   e  off of the extension rod  7 . In some implementations, such additional ways of attachment may include various ways, such as by glue, screw(s) or set screw(s). 
     As shown in  FIG. 14 b   , in some implementations, the extension cart  6  comprises a cutout  6   d  on the bottom of the extension cart  6 . In some implementations, the cutout  6   d  is wider at the opening and narrows to slightly wider than the engaging extension  9   a  at the other end of the cutout  6   d.    
     In some implementations, the cutout  6   d  guides the engaging extension  9   a  to engage the extension cart  6  when the chain  9  is moved in the direction to push the extension cart  6  toward the extended side  2   c  of the roller blind assembly  100 . In some implementations, the engaging extension  9   a  is then housed into the extension cart  6  when the engaging extension  9   a  reaches the closed end of the cutout  6   d.    
     In some implementations, once the engaging extension  9   a  is housed into the extension cart  6  by the cutout  6   d , further movement of the chain  9  to extend the roller blind sheet  130  pushes the extension cart  6  toward the extended side  2   c  of the roller blind assembly  100 . In some implementations, the roller blind sheet  130  is thereby pulled toward the extended side  2   c  of the roller blind assembly  100  by the coupling of the roller blind sheet  130  to the extension cart  6  through the connection of the sleeve  1   b ,  1   e  and the extension rod  7 . 
     In some implementations, the engaging extension  9   a  slides out of the extension cart  6  when the chain  9  is moved in the other direction toward the retracted side  2   a  of the roller blind assembly  100 . In some implementations, the engaging extension  9   a  can then travel away from the extension cart  6  without further affecting the position of the extension cart  6 . 
     As shown in  FIGS. 14 a  and 14 b   , in some implementations, the extension cart  6  also comprises a shelf  6   e.    
     As shown in  FIGS. 11 and 14   a , in some implementations, the shelf  6   e  connects an extension piece or limit switch extension  17  of the extension assembly  160  to the extension cart  6 . In some implementations, the limit switch extension  17  interacts with limit switches  37 ,  39 , described below. 
     In some implementations, the extension  17  is similar to, e.g. shaped like, a beam that has wider portions  17   a ,  17   b  on each end respectively. 
     In some implementations, the wider portions  17   a ,  17   b  assist in the interaction between the limit switch extension  17  and the limit switches  37 ,  39  respectively. 
     In some implementations, the length of the extension  17  on each end is based respectively on the location of the limit switches  37 ,  39  relative to the extension cart  6  when the roller blind sheet  130  is in the fully extended or fully retracted position. 
     In some implementations, the shelf  6   e  has holes that align with holes in the limit switch extension  17  for the connection of the limit switch extension  17  to the extension cart  6 . 
     In some implementations, the extension  17  can be connected to the extension cart  6  at the shelf  6   e  in various ways, such as by nuts and bolts, screws, or adhesive. 
     In some implementations, the extension  17  and the extension cart  6  may be integrated as a single part of the extension assembly  160 . 
     As shown in  FIGS. 11 and 15   a - 15   b , in some implementations, the retraction assembly  170  comprises a substantially rectangular prism shaped body  13  having a pair of openings  13   a ,  13   b  extending therethrough, as described herein. In some implementations, the body  13  has any other suitable shape. 
     As shown in  FIG. 1 c   , in some implementations, the retraction assembly  170  is moveably connected to the retraction track  14 . In some implementations, the retraction assembly  170  can move along the retraction track  14  between the first side  2   a  and the second side  2   c  of the frame  110 . 
     In some implementations, the retraction assembly  170  is engageably coupleable to the chain  9  by the body  13  of the retraction assembly  170 . In some implementations, a movement of the second engaging extension  9   b  toward the retraction assembly  170  by a movement of the chain  9  causes the second engaging extension  9   b  to engage the body  13  of the retraction assembly  170 . In some implementations, the movement of the second engaging extension  9   b  causes the chain  9  to couple to the retraction assembly  170  to move the retraction assembly  170  along the retraction track  14 . 
     As shown in  FIG. 1 c   , in some implementations, the retraction assembly  170  is coupled to the tube  5  of the roller tube assembly  120  by a tether  16 . In some implementations, the tether  16  is connected to the body  13  of the retraction assembly  170  and to the tube  5 . 
     In some implementations, the tether  16  rolls up around the tube  5  as the roller blind sheet  130  is unrolled and extended from the tube  5 . In some implementations, as the tether  16  rolls up around the tube  5 , the tether  16  moves the retraction assembly  170  towards the tube  5  and the first side  2   a  of the frame  110 . 
     In some implementations, the roller blind sheet  130  retracts and rolls up around the tube  5  as the tether  16  is unrolled and extended from the tube  5  by a movement of the retraction assembly  170  along the retraction track  14  by the chain  9 . 
     As shown in  FIGS. 11 and 15   a - 15   b , in some implementations, the retraction assembly  170  comprises a retraction cart  13 . In some implementations, the retraction cart  13  is connected to the tether  16  on the other end from the connection of the tether  16  to the roller tube tether attachment  23 . 
     As shown in  FIG. 11 , in some implementations, the retraction cart  13  is moveably connected to the track  14  of the track assembly  150 . In some implementations, the retraction cart  13  rides along the track  14 . 
     As shown in  FIGS. 15 a  and 15 b   , in some implementations, the retraction cart  13  comprises two openings (“holes”)  13   a ,  13   b . In some implementations, the retraction track rods  14   a ,  14   b  fit respectively into the two holes  13   a ,  13   b  in the retraction cart  13 . 
     In some implementations, the fit between the two holes  13   a ,  13   b  in the retraction cart  13  and the retraction track rods  14   a ,  14   b  is tight enough to prevent any excess movement of the retraction cart  13  from the retraction track  14 . In some implementations, the fit between the holes  13   a ,  13   b  and the rods  14   a ,  14   b  is loose enough to allow the retraction cart  13  to slide smoothly along the retraction track  14 . 
     As shown in  FIGS. 15 a  and 15 b   , in some implementations, the retraction cart  13  also comprises a hole  13   c  through the cart  13 . In some implementations, the hole  13   c  is sized to allow the tether  16  to thread through the hole to connect the tether  16  to the retraction cart  13 . 
     In some implementations, the tether  16  can be connected to the retraction cart  13  through the hole  13   c  in various ways, such as by a knot, a clip end, or a washer that is wider than the hole  13   c.    
     As shown in  FIG. 15 b   , in some implementations, the retraction cart  13  comprises a cutout  13   d  on the bottom of the retraction cart  13 . In some implementations, the cutout  13   d  is wider at the opening and narrows to slightly wider than the engaging extension  9   b  at the other end of the cutout  13   d.    
     In some implementations, the cutout  13   d  guides the engaging extension  9   b  to engage the retraction cart  13  when the chain  9  is moved in the direction to push the retraction cart  13  toward the extended side  2   c  of the roller blind assembly  100 . In some implementations, the engaging extension  9   b  is then housed into the retraction cart  13  when the engaging extension  9   b  reaches the closed end of the cutout  13   d.    
     In some implementations, once the engaging extension  9   b  is housed into the retraction cart  13  by the cutout  13   d , further movement of the chain  9  to retract the roller blind sheet  130  pushes the retraction cart  13  toward the extended side  2   c  of the roller blind assembly  100 . In some implementations, the tether  16  is thereby pulled by the retraction cart  13  and unwound from the tether attachment  23 . 
     In some implementations, the unwinding of the tether from the tether attachment  23  causes the tether attachment  23 , the roller tube bottom attachment  22 , and the roller tube  5  to rotate in unison. In some implementations, the roller blind sheet  130  is thereby wound onto the roller tube  5  to retract the roller blind sheet  130 . 
     In some implementations, the chain attachment  9   b  slides out of the retraction cart  13  when the chain  9  is moved in the other direction toward the retracted side  2   a  of the roller blind assembly  100 . In some implementations, the chain attachment  9   b  can then travel away from the retraction cart  13  without further affecting the position of the retraction cart  13 . 
     In some implementations, the tether  16  comprises a string. In some implementations, the tether  16  comprises a cord. In some implementations, the tether  16  comprises a wire. In some implementations, the tether  16  comprises a cable. 
     In some implementations, the tether  16  comprises any other suitable component. 
     In some implementations, the tether  16  is strong enough, e.g. has sufficient tensile strength, to pull the retraction assembly  170  toward the roller tube  5  as the roller blind sheet  130  is extended. In some implementations, the tether  16  is also strong enough to cause the roller tube  5  to rotate and retract the roller blind sheet  130  onto the roller tube  5  as the retraction assembly  170  is pushed away from the roller tube  5 . 
     As shown in  FIGS. 7 a  and 7 b   , in some implementations, the tether  16  is flexible enough to wrap snuggly around the tether attachment  23  or unwind from the tether attachment  23  as the roller tube  5  rotates. In some implementations, the tether  16  is also flexible enough to remain wound sufficiently tight around the tether attachment  23  when the roller blind assembly  100  is stationary and there is no force being applied to either of the assemblies  160 ,  170  or to the roller blind sheet  130 . 
     In some implementations, the tether  16  can be composed of various materials with the foregoing properties, such as string, cord, wire, or flexible cabling. 
     As shown in  FIGS. 6 and 16   a - 16   b , in some implementations, the motor assembly  180  comprises a motor  32 . In some implementations, the motor assembly  180  is attached to the frame  110 . 
     In some implementations, the motor  32  is coupled to the chain  9 , such as described further below, so that the motor  32  can cause the chain  9  to move along the horizontal loop. 
     In some implementations, the motor  32  is operable to move the chain  9  in a first direction that moves the first engaging extension  9   a  toward the extension assembly  160 . In some implementations, the motor  32  can move the first engaging extension  9   a  to engage the extension assembly  160 . In some implementations, the motor  32  can move the first engaging extension  9   a  to couple the chain  9  to the extension assembly  160 . In some implementations, the motor  32  can move the first engaging extension  9   a  to thereby move the extension assembly  160  along the extension track  8 . 
     In some implementations, the motor  32  is operable to move the chain  9  in a second direction that moves the second engaging extension  9   b  toward the retraction assembly  170 . In some implementations, the motor  32  can move the second engaging extension  9   b  to engage the retraction assembly  170 . In some implementations, the motor  32  can move the second engaging extension  9   b  to couple the chain  9  to the retraction assembly  170 . In some implementations, the motor  32  can move the second engaging extension  9   b  to thereby move the retraction assembly  170  along the retraction track  14 . 
     As shown in  FIGS. 16 a  and 16 b   , in some implementations, the motor assembly  180  further comprises a motor shaft attachment  34 . In some implementations, the motor shaft attachment  34  extends the rotation of the motor shaft to the second sprocket  30 , described above with respect to the chain assembly  140 . 
     In some implementations, the sprocket  30  and the attachment  34  are connected together and rotate in unison with the motor  32 , also connected to the attachment  34 , at the same angular velocity. 
     As shown in  FIG. 16 b   , in some implementations, the motor shaft extension  34  comprises a shaft with a shelf or flange  34   a  on the top side. In some implementations, the flange  34   a  comprises holes that align with a motor coupling  33 . 
     In some implementations, the motor shaft flange  34   a  can be connected to the motor coupling  33  in various ways, such as by nuts and bolts, screws, or rivets. 
     In some implementations, the motor coupling  33  can be connected to the shaft of the motor  32  in various ways, such as by set screws. 
     In some implementations, the shaft of the extension  34  is sized to provide sufficient torsional strength to transfer the torque of the motor  32  to the sprocket  30 , which can thereby move the chain  9  by the sprocket  30 . 
     In some implementations, the shaft of the extension  34  is long enough and narrow enough to position the motor  32  out of the path of the extension cart  6  and the attached roller blind sheet  130 . In some implementations, the shaft of the extension  34  is also long enough and narrow enough to allow a further length of travel of the extension assembly  160  and the attached roller blind sheet  130  toward the extended side  2   c.    
     In some implementations, the bottom portion of the extension  34   b  fits snuggly in the center of the sprocket  30 . 
     In some implementations, the sprocket  30  can be tightened to the bottom portion of the extension  34   b  in various ways, such as with set screw(s). 
     In some implementations, the motor  32  may be an alternating current (AC) or direct current (DC) motor. In some implementations, the motor  32  can be any other suitable type of motor. 
     In some implementations, the motor  32  can be powered in various ways, such as by a battery, a battery pack, or an AC power source, which may include an AC/DC power adapter or inverter. 
     In some implementations, the motor  32  has a bi-directional or reversible rotation. 
     In some implementations, the motor  32  is attached to the frame extended side  2   c  in a position that does not interfere with other components of the roller blind assembly  100  such as the chain  9 , engaging extensions  9   a ,  9   b , carts  6 ,  13 , or the tracks  8 ,  14 . 
     As shown in  FIGS. 16 a  and 16 b   , in some implementations, the motor  32  may attach to the frame extended side  2   c  by a mounting bracket  35 . In some implementations, the motor  32  may attach to the roller assembly frame  110  in any other suitable way. 
     In some implementations, as the motor  32  rotates in the applicable direction, e.g. clockwise or counter-clockwise, the motor  32  extends or retracts the roller blind sheet  130  through the various connections and operations of the components of the roller blind assembly  100  described herein. That is, in some implementations, the motor  32  allows the automated operation of the assembly  100  to extend or retract the roller blind sheet  130 . 
     However, in some implementations, the operation of the roller blind assembly  100  may be performed manually or in any other suitable manner. For example, in some implementations, a crank, handle, or other manual control (not shown) may be connected to the assembly  100  instead of the motor  32 , as described herein, to allow the manual operation of the assembly  100  to extend or retract the roller blind sheet  130 . 
     As shown in  FIG. 11 , in some implementations, the roller blind assembly  100  further comprises a first limit switch  37  and a second limit switch  39 . In some implementations, the first limit switch  37  and the second limit switch  39  are each attached to the frame  110 . 
     In some implementations, the first limit switch  37  is positioned adjacent to the extension track  8  to be activated by the extension assembly  160 . In some implementations, the first limit switch  37  is positioned to be activated when the extension assembly  160  has been moved along the extension track  8  to fully extend the roller blind sheet  130  across the frame  110 . 
     In some implementations, the first limit switch  37  when activated causes the motor  32  to stop moving the extension assembly  160  along the extension track  8 . 
     In some implementations, the second limit switch  39  is positioned adjacent to the extension track  8  to also be activated by the extension assembly  160 . In some implementations, the second limit switch  39  is positioned to be activated when the extension assembly  160  has been moved along the extension track  8  by the roller blind sheet  130  being fully retracted from across the frame  110 . 
     In some implementations, the second limit switch  39  when activated causes the motor  32  to stop moving the retraction assembly  170  along the retraction track  14 . 
     In some implementations, the limit switches  37 ,  39  prevent the motor  32  from continuing to drive the chain  9  after the roller blind sheet  130  has been fully extended or fully retracted by the motor  32 . For example, in some implementations, the limit switches  37 ,  39  send a signal to a motor controller  36 , described below, to stop the operation of the motor  32  after the roller blind sheet  130  has been fully extended or fully retracted. 
     In some implementations, the limit switches  37 ,  39  may be any suitable limit switch that can be used for the roller blind assembly  100 . In some implementations, other suitable switches can be used instead or in addition to the limit switches  37 ,  39 , such as a switch or other component that senses the operation of the roller tube  5  with respect to the position of the roller blind sheet  130 . 
     As shown in  FIGS. 17 a  and 17 b   , in some implementations, the roller blind assembly  100  comprises limit switch brackets  38 ,  40 . In some implementations, the brackets  38 ,  40  are used to mount the limit switches  37 ,  39  in the roller blind assembly  100 . 
     In some implementations, the brackets  38 ,  40  are used to mount the limit switches  37 ,  39  respectively on the retracted side  2   a  and extended side  2   c  of the roller blind assembly  100 . 
     In some implementations, the brackets  38 ,  40  are designed to position the limit switches  37 ,  39  to work and interact with the extension assembly  160  relative to the position of the roller blind sheet  130 , such as fully extended or retracted. 
     In some implementations, the brackets  38 ,  40  are also designed to position the limit switches  37 ,  39  to prevent interference between the limit switches  37 ,  39 , the brackets  38 ,  40 , and other components of the roller blind assembly  100 . 
     In some implementations, the brackets  38 ,  40  can be attached to the frame of the roller blind assembly  100  in various ways, such as by screws, nails, or adhesive. 
     As introduced above and shown in  FIG. 14 a   , in some implementations, the extension assembly  160  comprises a limit switch extension  17  attached to the extension cart shelf  6   e . In some implementations, the extension  17  interacts, e.g. engages, with the limit switches  37 ,  39  during operation of the roller blind assembly  100  as described herein. 
     As shown in  FIG. 6 , in some implementations, the roller blind assembly  100  further comprises a motor controller  36 . In some implementations, the motor controller  36  is attached to the frame  110 . 
     In some implementations, the motor controller  36  can be mounted in any suitable position on the frame  110  of the roller blind assembly  100  that does not interfere with other parts of the assembly  100 , such as the extension and retraction of the roller blind sheet  130 . For example, in some implementations, the motor controller  36  is mounted to the frame extended side  2   c.    
     In some implementations, the motor controller  36  is connected to the motor  32  to control the operation of the motor  32 . 
     In some implementations, the motor controller  36  may comprises any suitable component to control the operation of the motor  32  and thereby the roller blind assembly  100 . 
     In some implementations, the motor controller  36  allows a manual operation of the motor  32 . In some implementations, the motor controller  36  allows an automatic operation of the motor  32 . 
     In some implementations, the motor controller  36  allows a local operation of the motor  32 . In some implementations, the motor controller  36  allows a remote operation of the motor  32 . 
     In some implementations, the motor controller  36  allows such operation of the motor  32  to extend or retract the roller blind sheet  130 . 
     For example, in some implementations, the motor controller  36  can be operated by a remote control. As another example, in some implementations, the motor controller  36  can be operated by a wired switch configuration. 
     In some implementations, the motor controller  36  can control the motor  32  to operate, i.e. rotate, in both directions. 
     In some implementations, the motor controller  36  uses the limit switches  37 ,  39 , described above, to control the motor  32 . For example, in some implementations, the motor controller  36  uses the limit switches  37 ,  39  to start or stop the motor  32  when the roller blind sheet  130  is in a certain position, such as fully extended or fully retracted. 
     As described above, in some implementations, the motor  32  may be powered by various power sources, such as a battery or battery pack. As shown in  FIG. 6 , in some implementations, the roller blind assembly  100  may further comprise a power supply shelf (also referred to herein as a battery shelf)  42  for supporting such a battery or pack. In some implementations, the power supply shelf  42  is attached to the frame  110 . 
     In some implementations, the power supply shelf  42  stabily supports a power supply  41 , such as a battery or battery pack, of the roller blind assembly  100  that powers the motor  32 . 
     As shown in  FIGS. 18 a  and 18 b   , in some implementations, the battery shelf  42  comprises a flange  42   b  for the positioning and attachment of the shelf  42  to the roller blind assembly  100 , such as to the frame extended side  2   c.    
     In some implementations, the shelf  42  also comprises a raised edge  42   a  that prevents the battery  41  from sliding off the battery shelf  42 . 
     In some implementations, the shelf  42  provides a position for the battery  41  in the assembly that does not interfere with other parts of the assembly, such as the movement of the roller blind sheet  130  and connected components. 
     In some implementations, the shelf  42  may also minimize the visibility of the battery pack  41  positioned in the roller blind assembly  100 , e.g. for aesthetic appearance. 
     In some implementations, the shelf  42  can be attached to the frame of the roller blind assembly  100  in various ways, such as by screws, nails, or adhesive. 
     In some implementations, the shelf  42  attaches to the frame extended side  2   c  so that the battery  41  is oriented at the same or a similar angle as the top side of the angled architectural opening to which the roller blind assembly  100  is installed. In some implementations, this allows the battery shelf  42  and the battery  41  to be positioned behind the top outer frame side  3   d , if the outer frame  115  is included in the roller blind assembly  100 . 
     As introduced above, in some implementations, the roller blind assembly  100  may be rotated bottom side  2   b  up for use in an angled architectural opening with an angled bottom side instead of an angled top side. In some implementations, for such rotated assembly  100 , the raised edge  42   a  of the battery shelf  42  is positioned on the bottom of the shelf  42 . In some implementations, for such rotated assembly  100 , the battery  41  is positioned on the bottom of the battery shelf  42  to keep the battery  41  in position and behind the outer frame top side  3   d  if included in the assembly  100 . 
     Although the components of the roller blind assembly  100  are described herein as attached, coupled, or otherwise connected to the frame  110 , in some implementations, one or more of the components may not be connected as such to the frame  110 . For example, in some implementations, one or more of the components of the roller blind assembly  100  may be attached or otherwise connected to the angled architectural opening, e.g. to the frame thereof, to which the roller blind assembly  100  is installed. In some implementations, all of the components of the roller blind assembly  100  may be attached or otherwise connected to the angled architectural opening to which the roller blind assembly  100  is installed instead of being attached or otherwise connected to the frame  110 , which can thereby be omitted from the assembly  100 . 
     Furthermore, in some implementations, the roller blind assembly  100  may be permanently or temporarily installed to an angled architectural opening. For example, in some implementations, the roller blind assembly  100  may be removable and reinstallable to the angled architectural opening by detaching and reattaching respectively the frame  110  from/to the angled architectural opening with the other components attached or otherwise connected to the frame  110 . 
     In some implementations, the roller blind assembly  100  can have any suitable dimensions. 
     In some implementations, the roller blind assembly  100  is composed of any suitable materials. 
     In some implementations, the roller blind assembly  100  can have any suitable appearance. 
     In some implementations, an example method of using the roller blind assembly  100  comprises installing the roller blind assembly  100  to a window having a modified rectangular shape, as described above. In some implementations, the roller blind assembly  100  is installed by attaching the frame  110  of the roller blind assembly  100  to the window (e.g., the frame of the window). For example,  FIG. 20  illustrates a front side or interior side perspective view of the roller blind assembly  100  installed in an example angled architectural opening  1900  such as a window, as described above. 
     In some implementations, the frame  110  is attached so that the frame  110  fully fits the perimeter of the window. In some implementations, the frame  110  is attached so that the roller blind sheet  130  fully covers the opening of the window when the roller blind sheet  130  is fully extended across the opening. 
     For example, in some implementations, the frame  110  is attached so that the first side  2   a  of the frame  110  is adjacent to the first side of the window, the second side  2   c  of the frame  110  is adjacent to the second side of the window, and the bottom side  2   b  of the frame  110  is adjacent to the bottom side of the window. 
     In some implementations, the method further comprises covering the opening of the window with the roller blind sheet  130  by operating the motor  32  to move the chain  9  in a first direction, as described above. 
     In some implementations, the first engaging extension  9   a  is thereby moved toward the extension assembly  160 . In some implementations, the extension assembly  160  is thereby engaged by the first engaging extension  9   a . In some implementations, the chain  9  is thereby coupled to the extension assembly  160 . 
     In some implementations, the extension assembly  160  is thereby moved along the extension track  8 . In some implementations, the roller blind sheet  130  is thereby unrolled from the tube  5  and extended horizontally across the opening of the window. In some implementations, the opening of the window is thereby covered by the roller blind sheet  130 . 
     In some implementations, the tether  16  is also thereby rolled up around the tube  5  as the roller blind sheet  130  is unrolled and extended from the tube  5 . 
     In some implementations, the method further comprises uncovering the roller blind sheet  130  from the opening of the window by operating the motor  32  to move the chain  9  in a second direction, as described above. 
     In some implementations, the second engaging extension  9   b  is thereby moved toward the retraction assembly  170 . In some implementations, the retraction assembly  170  is thereby engaged by the second engaging extension  9   b . In some implementations, the chain  9  is thereby coupled to the retraction assembly  170 . 
     In some implementations, the retraction assembly  170  is thereby moved along the retraction track  14 . In some implementations, the tether  16  is thereby unrolled and extended from the tube  5  by the retraction assembly  170 . In some implementations, the roller blind sheet  130  is thereby retracted and rolled up around the tube  5  by the tether  16  unrolling from the tube  5 . In some implementations, the roller blind sheet  130  is thereby uncovered from the opening of the window. 
     In some implementations, an example method of operation of the roller blind assembly  100  comprises rotating the motor  32  in the applicable direction to extend the roller blind sheet  130 . In some implementations, the rotation of the motor  32  causes the extended side sprocket  30  to rotate by the rotation of the motor shaft extension  34 . In some implementations, the rotation of the sprocket  30  causes the attached chain  9  to travel in the associated direction in the path around the two cart tracks  8 ,  14 . 
     In some implementations, as the chain  9  travels, the engaging extensions  9   a ,  9   b  travel with the chain  9 . In some implementations, when the engaging extension  9   a  reaches the extension cart  6 , the engaging extension  9   a  slides into the cutout  6   d  on the extension cart  6  until it reaches the end of the cutout  6   d.    
     In some implementations, as the chain  9  continues to travel, the engaging extension  9   a  pushes the extension cart  6  in the extend direction of the assembly  100 . In some implementations, as the extension cart  6  is pushed in the extend direction, the roller blind sheet  130  is pulled by the extension cart  6  at the coupling of the extension cart rod  7  inserted into the roller blind sleeve  1   b.    
     In some implementations, as the roller blind sheet  130  is moved by the extension cart  6 , it unwinds from the roller tube  5 . In some implementations, the unwinding of the roller blind sheet  130  from the roller tube  5  causes the rotation of the roller tube  5 . In some implementations, the rotation of the roller tube  5  causes rotation of the roller tube bottom attachment  22  and attached tether attachment  23   
     In some implementations, the rotation of the tether attachment  23  causes the tether  16  to wind onto the tether attachment  23 . In some implementations, as the tether  16  is wound onto the tether attachment  23 , the tether  16  pulls the retraction cart  13  toward the retracted side of the assembly  100 . 
     In some implementations, an example method of operation of the roller blind assembly  100  comprises rotating the motor  32  in the applicable direction to retract the roller blind sheet  130 . In some implementations, the rotation of the motor  32  causes the extended side sprocket  30  to rotate by the rotation of the motor shaft extension  34 . In some implementations, the rotation of the sprocket  30  causes the attached chain  9  to travel in the associated direction in the path around the two cart tracks  8 ,  14 . 
     In some implementations, as the chain  9  travels, the engaging extensions  9   a ,  9   b  on the chain  9  travel with the chain  9 . In some implementations, the engaging extension  9   a  slides out of the cutout  6   d  on the extension cart  6  and travels away from the extension cart  6 . 
     In some implementations, the chain attachment  9   b  travels towards the retraction cart  13 . In some implementations, when the chain attachment  9   b  reaches the retraction cart  13 , the attachment  9   b  slides into the cutout  13   d  on the retraction cart  13  until it reaches the end of the cutout  13   d.    
     In some implementations, as the chain  9  continues to travel, the attachment  9   b  pushes the retraction cart  13  away from the roller tube  5  in the extend direction of the assembly  100 . 
     In some implementations, as the retraction cart  13  is moved, the tether  16  is pulled by the retraction cart  13  and unwinds from the tether attachment  23 . In some implementations, as the tether  16  unwinds from the tether attachment  23 , this causes the roller tube  5  to rotate in the corresponding direction. 
     In some implementations, the rotation of the roller tube  5  causes the roller blind sheet  130  to retract and wind onto the roller tube  5 . In some implementations, as the roller blind sheet  130  retracts and winds onto the roller tube  5 , the extension cart  6  is pulled toward the retracted side of the assembly  100  at the coupling of the extension cart rod  7  inserted into the roller blind sleeve  1   b.    
     As described above, in some implementations, the chain  9  may comprise a single engaging extension in place of the two extensions  9   a ,  9   b . In some implementations, such single engaging extension can provide essentially the same or substantially similar function as the two extensions  9   a ,  9   b  such as described in the above example methods of use and operation of the roller blind assembly  100 . 
     For example, in some implementations, the operation of the roller blind assembly  100  with such single engaging extension may slightly increase the amount of time for the engagement and coupling of the single engaging extension to the extension cart/assembly  6 ,  160  or the retraction cart/assembly  13 ,  170  during the operation of the assembly  100 . 
     As another example, in some implementations, the operation of the roller blind assembly  100  with such single engaging extension may slightly increase the amount of time for the transition between the extension and the retraction of the roller blind sheet  130  during the operation of the assembly  100 . 
     The figures, including photographs and drawings, comprised herewith may represent one or more implementations of the roller blind assembly. 
     Details shown in the figures, such as dimensions, descriptions, etc., are exemplary, and there may be implementations of other suitable details according to the present disclosure. 
     Reference throughout this specification to “an embodiment” or “implementation” or words of similar import means that a particular described feature, structure, or characteristic is comprised in at least one embodiment of the present invention. Thus, the phrase “in some implementations” or a phrase of similar import in various places throughout this specification does not necessarily refer to the same embodiment. 
     Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. 
     The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided for a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that embodiments of the invention can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations may not be shown or described in detail. 
     While operations may be depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.