Control device to position projection screen for viewing

Details Control device to position projection screen for viewing Control device to position projection screen for viewing

1976-01-09

1977-08-30

Wintercorn, Richard A.

Flexible or portable closure, partition, or panel

Fabric fastening means

To elongated element

160310, 200 6116, 200 6141, 200 6162, G03B 2156

Patent

active

040451232

ABSTRACT:
A projection screen apparatus includes an elongate roller, a flexible screen which is wound on the roller when it is in a closed position and unwound from the roller when it is in an exposed position, an electric drive motor connected to the roller for rotating the roller to move the screen between exposed and closed positions, a first switch for actuating the drive motor to move the screen toward an exposed position, and a second switch for stopping the drive motor and the roller when the screen is in a fully exposed position. A lever urged against the screen wound on the roller moves the second switch to an inoperative position when a predetermined amount of screen is unwound from the roller to interrupt the electric circuit leading to the drive motor.

REFERENCES:
patent: 3126805 (1964-03-01), Schroder et al.
patent: 3254167 (1966-05-01), Altmann
patent: 3355149 (1967-12-01), Wiegelmann et al.
patent: 3467797 (1969-09-01), Revell

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