Patent ID: 8448689
Filing Date: 2013-05-28
Classification: B60J,E06B,Y10T

Abstract:
1. A roll-up door configured to be mounted in an opening to an interior of a truck or trailer and comprising a plurality of panels joined together at the upper and lower portions thereof with hinges and further comprising roller assemblies mounted to sides of the panels for mounting the panels in channels for movement between an upper position and a lower position, the improvement comprising at least some of the panels are formed of thermoplastic material that is blow-molded into hollow panels that have a relatively flat outside wall and an inside wall, wherein the inside wall is characterized by ribs that extend longitudinally and transversely on each thermoplastic blow-molded panel, wherein at least some of the ribs that extend longitudinally are formed solely by contiguous, open, longitudinally-extending channels that extend toward the outside wall and at least some of the longitudinally-extending channels are fused to the outside wall of the thermoplastic blow-molded panels and the hinges are mounted to the thermoplastic blow-molded panels with fasteners that penetrate the thermoplastic blow-molded panels at the upper and lower portions thereof.