Roller shade for non-rectangular windows

A roller shade adapted to be installed in a non-rectangular structural opening, comprising a pair of side jambs interconnected at their first ends by a first jamb and at their second ends by a second jamb, wherein the roller shade comprises:

• a roller tube adapted to be attached between the side jambs and proximate to the first jamb;
• a shade material comprising and extending between a first end attached to the roller tube and a second end, wherein the roller tube is adapted to rotate to roll or unroll the shade material, wherein the shade material comprises a shape that corresponds to a shape of the structural opening such that the shade material substantially covers the structural opening when the shade material is unrolled from the roller tube;
• a pair of longitudinal side channels each comprising a longitudinal track and adapted to be attached along one of the side jambs;
• an extendable hem bar assembly attached to the second end of the shade material and comprising:
• a hollow housing with a pair of opposite open ends,
• a pair of extendable arms each partially residing within the hollow housing and partially extending from a respective one of the opposite open ends of the hollow housing,
• a pair of wheels each attached proximate to a terminal end of a respective one of the pair of extendable arms, wherein each wheel is adapted to be retained by and travel within a respective one of the longitudinal tracks, and
• a plurality of rotatable interengaged idler gears disposed within the hollow housing, wherein each of the pair of extendable arms comprise a respective gear rack adapted to engage at least two of the idler gears, wherein the idler gears comprise different gear ratios to allow the pair of extendable arms to extend at different distances from the hollow housing;
• and
• a pair of tension modules adapted to be attached proximate to the second jamb, wherein each tension module comprises a retractable cable attached to the hem bar assembly proximate to one of the wheels, wherein the tension modules are adapted to provide tension on the hem bar assembly.