Wall roll-up screen

Details Wall roll-up screen Wall roll-up screen

2007-09-25

2007-09-25

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Rear projection screen

Reexamination Certificate

active

10525801

ABSTRACT:
The device relates to a wall roll-up screen of which the upper and the lower are attached with the upper short rod and the lower short rod, respectively, wherein the screen is constituted to be rolled up when not in use and to be unrolled when used, by the lower short rod; and the left and the right end of the upper short rod are mounted with steel structure of groove shaped ringscapable of coupling magnets and the left and the right end of the lower short rod are mounted with magnets to allow them to be coupled with the groove shaped rings of the left end and the right end of the upper short rod, upon rolling up the screen by the lower short rod and, if necessary, separating the magnets from the groove shape rings, thereby to obtain good portability and mobility of the screen, to prevent the screen from being twisted from side to side upon fixing the screen, and to improve aesthetic value of product.

REFERENCES:
patent: 109266 (1870-11-01), Stephens
patent: 3313337 (1967-04-01), Bernat
patent: 3568751 (1971-03-01), Takahashi
patent: 4110003 (1978-08-01), Zinn
patent: 5128644 (1992-07-01), Nellessen
patent: 5581401 (1996-12-01), Takamoto et al.
patent: 5791624 (1998-08-01), Fedrick
patent: 6470950 (2002-10-01), Shimizu
patent: 6552847 (2003-04-01), Congard
patent: 11-142974 (1999-05-01), None
patent: 1998-027358 (1998-08-01), None

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