Trap door for projection screen case

Details Trap door for projection screen case Trap door for projection screen case

1993-05-26

1994-08-23

Hayes, Monroe H.

Optical: systems and elements

Projection screen

359461, G03B 2156

Patent

active

053412419

ABSTRACT:
An electrically actuated trap door system for a projection screen case. The system includes a trap door having first and second opposing edges. The first edge of the trap door is pivotally connected to the case such that the trap door is movable between a closed position in which the trap door is substantially flush with the bottom surface of the case and an open position in which the second edge of the trap door is disposed within the interior of the housing to form an opening in the bottom surface of the case. A motorized roller rotatable in first and second directions about its longitudinal axis is disposed within the case, and a ribbon connects the trap door and the roller to translate the rotation of the roller into movement of the trap door between its closed position and its open position.

REFERENCES:
patent: 4072404 (1978-02-01), Brown
patent: 4180183 (1979-12-01), Muller
patent: 4373289 (1983-02-01), Douglas et al.
patent: 4727919 (1988-03-01), Kraeutler
patent: 4748766 (1988-06-01), Stimac
patent: 4768525 (1988-09-01), Tanis

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