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Method for manufacturing hollow air spoiler

  • US 5,240,536 A
  • Filed: 04/30/1992
  • Issued: 08/31/1993
  • Est. Priority Date: 12/16/1989
  • Status: Expired due to Term
First Claim
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1. A method for manufacturing a hollow air spoiler comprising the steps of setting upper and lower injection molded thermoplastic synthetic resin parts having curved rear and lateral outer surfaces and curved end faces into upper and lower fixed jigs including facing surfaces having recesses therein of a curvature conforming to that of the curved rear and lateral outer surfaces of the corresponding part received therein, the relative sizes of the recesses in the jigs and the corresponding parts being such that the lateral portions of the synthetic resin parts are enclosed within the respective recesses and terminal portions of said lateral portions which define said end faces extend outwardly from the recesses so as to project outwardly beyond the facing surfaces of the respective jigs, and said jigs including opposing grooves therein which extend around the corresponding recess adjacent the corresponding facing surface and which are brought into registration when said jigs are closed and said facing surfaces are brought together, placing between said upper and lower parts a heater device having upper and lower curved surfaces each of a curvature matching that of a corresponding curved end face of said upper and lower parts and including heating means distributed over the full length of the heater device to provide uniform heating, bringing together under pressure said upper and lower fixed jigs, contacting the said end faces of said upper and lower parts to said heater device under pressure, opening said upper and lower fixed jigs when a desired degree of melting of said end faces has been achieved, removing said heater device from said upper and lower fixed jigs, closing said upper and lower fixed jigs and applying pressure, maintaining the applied pressure until a desired dimension extending inwardly from said end faces has been achieved and said terminal portions have been joined together to form an outwardly expanded portion of the synthetic resin of the parts which extends around the joined area between the end faces of the parts and which fills the opposing grooves brought into registration with each other when the jigs are closed, opening said upper and lower fixed jigs to remove a product therefrom when the molten thermoplastic synthetic resin of the parts is fixed and united, removing the outwardly expanded portion of the synthetic resin of the parts produced during the application of pressure to thereby obtain an intermediate product, and applying a coating to said intermediate product to obtain a finished product.

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