Sun-shade device

A sun-shade device comprising:

• an elongate housing having a top side formed with a longitudinally extending slit, and opposite first and second end portions;
• an elongate roller journalled in said housing and rotatable about a longitudinal axis thereof;
• a screen having a lower edge connected to said roller and an upper edge which extends out of said housing via said slit and which is provided with a horizontal strip that has opposite first and second end portions;
• a first biasing member provided in said housing for biasing said roller to rotate in a direction for winding said screen on said roller;
• left and right stretching arm units, each of which includes an upper arm member having an upper first end connected pivotally to a respective one of said first and second end portions of said horizontal strip about a horizontal first pivot axis transverse to the longitudinal axis of said roller, and a lower second end, and a lower arm member having an upper third end connected pivotally to said second end of said upper arm member about a horizontal second pivot axis parallel to the first pivot axis, a lower fourth end, and a mounting portion formed between said third and fourth ends and mounted pivotally on a respective one of said first and second end portions of said housing about a horizontal third pivot axis parallel to the first and second pivot axes;
• and
• a drive unit mounted on said housing and connected to said fourth ends of said lower arm members of said left and right stretching arm units for driving said fourth end of said lower arm member of each of said stretching arm units to pivot about the third pivot axis in a first direction toward the other one of said stretching arm units, thereby causing said upper arm members to pivot relative to said lower arm members and said horizontal strip for stretching from said lower arm members and for unwinding said screen from said roller, said drive unit further driving said fourth end of said lower arm member of each of said stretching arm units to pivot about the third pivot axis in a second direction away from the other one of said stretching arm units, thereby causing said upper arm members to pivot relative to said lower arm members and said horizontal strip for folding toward said lower arm members so as to permit retraction of said screen into said housing and winding of said screen on said roller due to biasing action of said first biasing member;
• said third end of said lower arm member of each of said stretching arm units being formed with a pin projection that projects in a direction parallel to the second pivot axis, said second end of said upper arm member of each of said stretching arm units being formed with an engaging groove which engages said pin projection when said upper arm member is aligned with said lower arm member and is stretched from said lower arm member.