Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1981-05-04
1982-05-18
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
52107, 264157, 264160, B29C 1704, B29C 1714
Patent
active
043305008
ABSTRACT:
The method comprises gripping the edges of a sheet of thermoplastic resin in a drawing frame, heating the sheet to a drawing temperature, drawing the sheet within the frame against a mold to a spheroidlike hemisphere, drawing an outstanding double-walled ridge about the transverse equator of the spheroidlike hemisphere and forming a central groove in the crest of the ridge. The spheroidlike hemisphere is divided, as by sawing or routing, along the groove at the crest of the ridge and across the undrawn material, thereby forming a pair of window well covers with the undrawn material at the frame providing a first flange of each, and the two walls of the ridge providing a second flange of the respective covers. The portion of the groove remaining with each separated ridge wall provides reinforcing curl along the edge of each second flange, while excess undrawn material may be removed to trim the first flange of each cover. The mold is preferably a male mold conforming to the interior of the spheroidlike hemisphere and having an equatorial outwardly extending ridge with a central slot for forming the groove by sealing the sheet at the base of the mold and producing a vacuum to pull the sheet into the slot in the said ridge. The male mold also has outstanding ridges perpendicular to the equatorial ridge for forming corresponding ribs for reinforcement.
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B Q P Industries, Inc.
Silbaugh Jan H.
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