Patent ID: 8031400

Claim:
A retractable frame of projection screen comprising: a receiving case having an accommodating space; a cylinder having a cylinder retractable arm movable between a cylinder arm retracted position and a cylinder arm extended position and a first cylinder retractable arm connected to a first end of the receiving case; an upper support; a supporting arm having a first supporting arm end connected to the cylinder and a second supporting arm end connected to a second end of the upper support; a connecting member provided on the supporting arm; and a main retractable arm having a main groove and a driven retractable arm extending from a first end of the main retractable arm, the driven retractable arm is movable between a driven retractable arm retracted position and a driven retractable arm extended position, a first driven retractable arm end of the driven retractable arm is connected to a second end of the receiving case and a second end of the main retractable arm is connected to a first end of the upper support and the connecting member is slidably located in the main groove of the main retractable arm; wherein, when the cylinder retractable arm moves from the cylinder arm retracted position to the cylinder arm extended position, the driven retractable arm moving from the driven retractable arm retracted position to the driven retractable arm extended position, the connecting member slidably moving in the main groove of the main retractable arm, and the upper support moving away from the receiving case; wherein, when the cylinder retractable arm moves from the cylinder arm extended position to the cylinder arm retracted position, the driven retractable arm moving from the driven retractable arm extend position to the driven retractable arm retracted position, the connecting member slidably moving in the main groove of the main retractable arm, and the upper support moving toward the receiving case.