Portable screen device with dual shaft structure

Details Portable screen device with dual shaft structure Portable screen device with dual shaft structure

2006-03-14

2008-07-29

Perkey, W. B. (Department: 2862)

Optical: systems and elements

Projection screen

Roll up screen

Reexamination Certificate

active

07405876

ABSTRACT:
A portable screen device having a dual shaft structure is disclosed. A left and a right rotation shafts are installed to an upper rod and the center of a lower frame of a screen in the horizontal direction and are connected to a left and a right supports. The rotation shafts are engaged with each other by a single adjusting device. When the screen moved up, the elasticity of the screen is held by left and right elastic wheels such that height of the screen is maintained. A magnet and a magnetic substance contact each other and are separated from each other at the central portions of the left and right supports. Due to rotation of a rotation rod installed in the intermediate portion of the supports, the screen moves up and down. Therefore, volume and weight of the portable screen device are reduced and the stability is increased.

REFERENCES:
patent: 6297905 (2001-10-01), Takamoto et al.
patent: 2000-0017351 (2000-03-01), None

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