Pivotal, large area cinematographic screen for open-air performa

Details Pivotal, large area cinematographic screen for open-air performa Pivotal, large area cinematographic screen for open-air performa

1994-06-16

1996-02-13

Gellner, Michael L.

Optical: systems and elements

Projection screen

359450, 353 75, G03B 2156

Patent

active

054915848

ABSTRACT:
The projection wall comprises a screen section carrying the screen and resting on two supports. The screen section can be pivoted by means of hydraulic drives about a first horizontal axis in both directions of rotation. The supports can be folded about a second horizontal axis by actuating hydraulic braces.
Since the screen section can be pivoted in both directions, it is possible to yield to winds coming from the front and the back side. Furthermore, the projection wall can be moved to a horizontal position for assembly and disassembly. The device is easy to install and requires no anchoring.

REFERENCES:
patent: 1798078 (1931-03-01), Geyling et al.
patent: 1832821 (1931-11-01), Sponable
patent: 3640601 (1972-02-01), Murray
patent: 4498734 (1985-02-01), Mihalakis et al.

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