Projection screen assembly

Details Projection screen assembly Projection screen assembly

G - Physics

03

B

88/90

G03B 21/56 (2006.01) G03B 21/58 (2006.01)

Patent

CA 1178462

ROGERS, BERESKIN & PARR C A N A D A Title: PROJECTION SCREEN ASSEMBLY Inventor: WILLIAM CHESTER SHAW ABSTRACT OF THE DISCLOSURE A projection screen assembly is disclosed. The assembly includes a screen which can be lifted into an extended position or lowered into a collapsed configura- tion for permitting a building in which the screen is installed to be used for other purposes. Lifting means is provided for raising the screen and tensioning it in the vertical direction. Lateral tensioning is effected simultaneously by tensioning elements disposed one adjacent each side edge of the screen. The tensioning elements are coupled to the screen by lateral tensioning members which are of progressively decreasing length in directions extending inwardly from the upper and lower margins of the screen so that the tensioning elements adopt the shape of catenary curves. When the screen is tensioned vertically, these curves are flattened so that the screen is tensioned laterally by the lateral tensioning members.

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