Projection screen unit

Details Projection screen unit Projection screen unit

1974-07-12

1976-03-09

Hix, L. T.

G03B 2158

Patent

active

039428699

ABSTRACT:
A screen for a projection system supported by a pair of cross members extending to the four corners of the screen where they receive a tensioning member disposed around the perimeter of the screen and held in stress by a tensioning mechanism secured to a portion of one of the cross members. The cross members may be secured in their "up" position by means of a restraining member and the screen may be tilted forward as permitted by one of several modes of support. The screen may be shaped with curvilinear edges preferably of a catenary configuration to increase tautness which is imparted thereto by the tensioning member.

REFERENCES:
patent: 1728356 (1929-09-01), Morgan
patent: 1819776 (1931-08-01), Heck
patent: 1843312 (1932-02-01), Ames
patent: 1901963 (1933-03-01), Hansen
patent: 2060817 (1936-11-01), Mahoney
patent: 2486206 (1949-10-01), Renison
patent: 2894520 (1959-07-01), Roschke
patent: 2934076 (1960-04-01), Fulke

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