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AssigneeFleet Engineers, Inc.
InventorsGary Roberts, Tom Gerst
Estimating the term…
A roll-up door has a plurality of panels and a plurality of roller assemblies mounted to ends of the panels for mounting the panels in channels. At least some of the panels are formed of blow-molded thermoplastic material and have a relatively flat outside face and an inside face including ribs that extend longitudinally and transversely on the panel. A reinforced panel of thermoplastic material is made by blow molding a panel with a thermoplastic material to form a relatively flat outside face and a ribbed inside face, and with elongated channels along upper and lower walls thereof. The panel is trimmed while it is still warm to open the channels at one end. While the panel is still warm, reinforcing members are inserted into the elongated channels. The panels are cooled to shrink the channels onto the reinforcing members.
A roll-up door comprising a plurality of panels joined together at the top and bottom walls thereof with hinges and further comprising roller assemblies mounted to side walls 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, which is characterized by ribs that extend longitudinally and transversely on the panel.
A panel for use in a roll-up door assembly comprising a plurality of panels joined together at top and bottom walls thereof with hinges and roller assemblies mounted to side walls of the panels for mounting the panels in channels for movement between an upper position and a lower position, the panels are formed of thermoplastic material that is blow-molded into a hollow form that has a relatively flat outside wall and an inside wall, which is characterized by ribs that extend longitudinally and transversely and are fused to the outer wall;
A method for making a reinforced panel of thermoplastic material comprising:
Dependencies are inferred from the claim text.