Window blind system

A window blind system for a window opening of a window frame comprising:

• a left triangular panel and a right triangular panel, each of said left triangular panel and said right triangular panel having a plurality of sections bundled fixedly at one fixed end, and said left triangular panel and right triangular panel being located in said window frame in an inverted manner relative to one another with said fixed end therein of each panel being located adjacent to a diagonally opposite corner of said window frame,
• an outer left side section of said left triangular panel secured to a left side rim of said window frame, and an outer right side section of said right triangular panel secured to a right side rim of said window frame,
• a first opening formed at an upper edge portion of said outer left section of said left triangular panel, and additional first openings formed at upper edge portion of all other sections of said left triangular panels, said first opening and said additional first openings being located at a substantially equal distance from said fixed end of said left triangular panel,
• a second opening formed at a bottom edge portion of said outer right section of said right triangular panel, and additional second openings formed at bottom edge portion of all other sections of said right triangular panel, said second opening and said additional second openings being located at a substantially equal distance from said fixed end of said right triangular panel,
• an elongated first pull cord threaded through said first opening and said additional first openings of said left triangular panel with an abutment knot formed therein juxtaposed to an inner section of said left triangular panel, said first pull cord having a free end portion extending outside of said window frame through a first exit opening formed in one of said left side rim and right side rim,
• an elongated second pull cord threaded through said second opening and said additional second openings of said right triangular panel with an abutment knot formed therein juxtaposed to an inner section of said right triangular panel, said second pull cord having a free end extending outside of said window frame through said first exit opening,
• a first bracket mounted to a top corner of said inner section of said left triangular panel, said first bracket having two slider blocks located on two opposite sides of said inner section of said left triangular panel, said slider blocks being slidably engageable with two elongated slots formed on inner side walls of a first channel formed in a top rim of said window frame,
• an elongated third pull cord having one end therein tied to said first bracket and a free end extending outside said window frame through a second exit opening formed in a vertical side run of said window frame,
• a second bracket mounted to a bottom corner of said inner section of said right triangular panel, said second bracket having two slider blocks located on two opposite sides of said inner section of said right triangular panel, said slider blocks being slidably engageable with two additional elongated slots formed on inner side walls of a second channel formed in a bottom rim of said window frame,
• an elongated fourth pull cord having one end therein tied to said second bracket and a free end extending outside said window frame through said second exit opening.