Title: Projection screen unit

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.

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Inventors: Portner, Robert (Blackwood, NJ, US)
Miller, Phillip (Turnersville, NJ, US)

Application Number: 488010
Filing Date: 1974-07-12
Publication_date: 1976-03-09
Assignee: Magna Mir, Inc. (Philadelphia, PA)
Primary Class(es): 359/443
Other Classes:
US Patent Ref:

1728356	Sep, 1929	Morgan	135/4.
1819776	Aug, 1931	Heck	350/119.
1843312	Feb, 1932	Ames	135/5.
1901963	Mar, 1933	Hansen	350/117.
2060817	Nov, 1936	Mahoney	350/125.
2486206	Oct, 1949	Renison	350/117.
2894520	Jul, 1959	Roschke	135/4.
2934076	Apr, 1960	Fulke	135/7.

Other Refs: 1,103,575544,137723,3811,216,652

May, 1965	UK
Jan, 1956	BE
Feb, 1955	UK
Dec, 1970	UK

Primary Examiner: Hix, L. T.
Assistant Examiner: Mathews, Alan
Attorney: Steele & Petock