Retractable frame of projection screen

Details Retractable frame of projection screen Retractable frame of projection screen

2008-05-07

2011-10-04

Laballe, Clayton E (Department: 2862)

Optical: systems and elements

Projection screen

Roll up screen

Reexamination Certificate

active

08031400

ABSTRACT:
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 arm are received in the accommodating space.

REFERENCES:
patent: 1571661 (1926-02-01), Descoteau
patent: 3144899 (1964-08-01), La Mar et al.
patent: 4068921 (1978-01-01), Okumura
patent: 5274499 (1993-12-01), Shopp
patent: 6191886 (2001-02-01), Sinkoff
patent: 6249377 (2001-06-01), Takamoto et al.
patent: 2005/0174638 (2005-08-01), Kotera
patent: 2006251756 (2006-09-01), None

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