Control mechanism for positioning projection screen in closed po

Details Control mechanism for positioning projection screen in closed po Control mechanism for positioning projection screen in closed po

1976-01-09

1978-02-07

Wintercorn, Richard A.

Flexible or portable closure, partition, or panel

Fabric fastening means

To elongated element

160310, 200 6116, 200 6162, 318261, G03B 2156, A47G 502, A47H 100

Patent

active

040724042

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 a closed position, and a second switch for stopping the drive motor and the roller when the screen is in a fully closed position. A free marginal end portion of the screen engages a lever which moves the second switch to an inoperative position to interrupt the electric circuit leading to the drive motor.

REFERENCES:
patent: 3126805 (1964-03-01), Schroder et al.
patent: 3355149 (1967-11-01), Wiegelmann et al.
patent: 3467797 (1969-09-01), Revell
patent: 3593084 (1971-07-01), Dalton

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