| 摘要 |
An information display system, mountable on planar surfaces such as the walls of buildings or the sides of semi-trailers, includes a frame and a polygonal flexible sheet perimetricly anchored to the frame. The system includes at least one anchoring bracket rigidly attached to the planar surface at each of the sheet's apices or corner locations. Other anchoring brackets may be rigidly attached to the planar surface at various locations along the sign's edges. The sign may be a sheet of flexible polymeric material which may be optionally fiber-reinforced. Alternatively, the sign may be cloth made from tightly woven natural or synthetic fibers. An advertising message or other graphic information is printed on the sign, which is hemmed along its perimetric edges to create a channel surrounding the sheet. At least one retaining device is inserted through the perimetric hem and the sheet is secured by tensioning means attached to the anchoring brackets which act on the retaining device(s). For a first embodiment of the invention, the retaining devices includes multiple hollow tension beams, each of which has longitudinal slit through which a portion of the hemmed edge of the flexible sheet is inserted. A trapping stick, rod or tube, inserted through the hem within the tension beam effectively secures the hemmed edge to the tension beam. Each tension beam encloses a portion of the hemmed edge. Each end of tension beam is secured to an anchoring bracket with tensioning bolts. The tightening action stretches the flexible panel within the anchoring frame so as to provide a smooth surface on which the information is displayed. For a second embodiment of the invention, load distributing-tubes are inserted within the perimetric hem, and a cable is inserted through the load-distributing tubes, forming a loop which surrounds the entire perimetric edge. The ends of the cable are joined with one of various types of available connectors which are crimped to each end of the cable. The cable is then tightened at the apices of the sign sheet, preferably with pulleys, and optionally along the edges of the sheet. A third embodiment of the invention shares design elements of both the first and second embodiments. As with the second embodiment, the hem of the sign sheet is exposed rather than trapped within the tension beams. Multiple tension struts are inserted within the hem so that they are positioned end to end around the perimeter of the sign sheet. As with the tension beams of the first embodiment, each end of each tension strut is tightened against an anchoring bracket with tensioning bolts. For any of the three embodiments of the invention, a gap seal may be employed to block airflow beneath the polymeric sheet.
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