Screen retractor mechanism

A screen retractor mechanism including an accordion type flexibly stretchable screen having a large number of unfoldably foldable pleats in the fashion of an accordion, said accordion screen having the base end thereof fixedly connected to a receptacle box frame constituting one of side frame members of a screen support frame structure, and a movable frame attached to the fore end of said screen slidably along said screen support frame structure for opening and closing said accordion screen, characterized in that said screen retractor mechanism comprises:

• a plural number of tension cords threaded through said screen and each having one end thereof fixedly connected to said movable frame and the other end led into said receptacle box frame via a turn-guide member;
• a pendant weight connected to the other ends of said tension cords to hang down within said receptacle box frame and constantly applying a biasing force to said movable frame in a screen opening direction;
• and
• a resistant means adapted to apply a resistive force at least against descending movement of said pendant weight as soon as said pendant weight reaches a certain lowered position close to a lowest stop position in each screen opening stroke.