Concertina tunnel, linking sections of trailer buses and trains and trams, has a plastics window section following the concertina folds with reinforcement frames at the stitched seams bonding the window edges to the concertina structure

摘要

The concertina tunnel, linking two vehicle sections of a trailer bus or tram or train, has a window section (10) of a transparent or translucent plastics stitched to the concertina structure at its edges. Stitching reinforcements (13) are at the stitched seams (15), using a frame of tear-resistant material at the window edge (12). The frame is of a textile fabric, in a U-shape around the window edge, fused to the plastics window. The plastics window follows the folds (11) of the concertina tunnel (1).