| 摘要 |
In a preferred embodiment of the invention, there is provided an air-lock tunnel composed of side and top panels forming a tunnel and swing-hinge-mounted panel doors at each of opposite ends of the tunnel, all panels being refrigeration insulation flexible panels, of which the panel doors are typical in general structure, each panel door being closed-cell rubber sheet sandwiched between sandwiching Nylon sheets each surface-coated with a rubber layer and each rubber-coated Nylon sheet being flexible, having a lower half of the exposed (exterior) surface of the sandwiching flexible sheets covered by an attached bumper or kick guard sheet of thick Nylon fabric having a polyvinylchloride composition plastic coating and having a cut-out groove spaced-from and following the curcumscribing edge thereof in which twisted Nylon thread follows and is recessed within the cut-out groove in the sewn attachment of the bumper sheet to the exposed surface of the flexible sheet, the door having the sandwiching fabric sheets extending beyond the edges of the sandwiched rubber, with the free edges of the sandwiching sheets turned-under and sewn-together as four layers thereby increasing strength thereof and forming a channel receivable of an upper-end support bar and a hinge-side support bar, the upper and side bars being upright and horizontal legs of a right-angle bar of which the upright bar extends through a spring-biased hinge mechanism for centering the door in a closed position normally, the hinge mechanism and structure being mounted on an upright bar which is a part of a u-shaped support structure mounted on a side wall above a door and serving to extend through fabric loops of the panel structures thereby supporting the panel roof and opposite sides of the tunnel.
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