Retractable frame of projection screen

A retractable frame of a projection screen comprising:

• a receiving case having an accommodation space, a first end part and a second end part;
• a rolling shaft located in said receiving case;
• a rolling device located in said receiving case and a first end thereof connected to said first end part and a second end thereof connected in said rolling shaft;
• a first support rod having a first end directly connected to said receiving case and an engaging plate located on a second end of the first support rod and extending outwardly from a lateral side thereof, said engaging plate has a plate hole, wherein two opposing sides of said engaging plate respectively having an engaging surface;
• a second support rod having two engaging arms located on a first end thereof and corresponding to said engaging plate, and each engaging arm having an engaging hole corresponding to the plate hole of the first support rod, the engaging plate is located between the two engaging arms;
• a combination member passing through said engaging holes and said plate hole and connected with said first support rod and said second support rod;
• a top supporter connected to a second end of said second support rod;
• and
• a projection screen having a first end connected to said top supporter and a second end connected to said rolling shaft and being selectively rolled on said rolling shaft by said rolling device.