Retractable frame of projection screen

Details Retractable frame of projection screen Retractable frame of projection screen

G - Physics

03

B

G03B 21/56 (2006.01)

Patent

CA 2630205

The present invention relates to a retractable frame of projection screen comprises, a receiving case; a cylinder; a supporting arm; a main retractable arm; and an upper support; when folding, the upper support is downwardly pressed, then the cylinder retractable arm is forced to inwardly retract by the cylinder and the driven retractable arm is inwardly retracted toward the main retractable arm until the cylinder retractable arm is fully received in the cylinder and the driven retractable arm is fully received in the main retractable arm, so the projection screen, the upper support, the supporting arm, the connecting member and the main retractable aim are received in the accommodating space.

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