| 摘要 |
A projection screen system that may be installed in a building in stages to reduce the risk of damage to the projection screen. The system includes a housing in which is mounted a socket circuitable with a power supply of the building. An assembly of the system that may be attached to the housing at a later stage of building construction includes a motor with a power cord, a roller and a projection screen. The motor rotates the roller to unwind the projection screen from around the roller and thereby lower the projection screen. A first end of the power cord is circuited to the motor, and a second end of the power conduit includes a plug that mates with the socket to operatively circuit the motor to the building's power supply. The housing also includes longitudinally extending lipped projections along its top wall. Attachment lugs of brackets that support the roller are adapted to engage the lipped projections and enable the brackets to be mounted to the housing at selected longitudinal locations to allow for screen positioning adjustments. The vertical side walls of the housing also are each constructed with a projecting lip adapted to engage an upstanding hook of the bottom closure panel to thereby enable the closure panel to be mounted to either of the side walls of the housing.
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