Polymer fabrication methods
AssigneeConstruction Services Queensland Pty Ltd
InventorStephen Mark Gallehawk
Life of this patent
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Abstract
There is provided a polymer fabrication method for forming 3-dimensional shapes from a sheet polymer blank (10) by machining at least one re-entrant, elongate groove forming a reduced thickness portion (25) permitting the blank to be folded and having opposed edges (12) at the surface, folding the blank about the groove to form at least a portion of the 3-dimensional shape, the re-entrant of the groove forming an elongate chamber (21) adjacent the reduced thickness portion and opening through an elongate gap (20) between the opposed edges, hot air welding the opposed edges across the gap with filler rod (22), and heating the reduced thickness portion to a selected thermo-reforming temperature via the chamber.
Claims12
A door frame assembly including a pair of door frame upright members and a door frame header member,
- each member comprising a polymer jamb portion integrally formed between polymer architrave portions, and each member being formed from a sheet of polymer material, wherein said sheet of polymer material includes re-entrant elongate grooves formed therein, between said polymer jamb portion and each respective integral polymer architrave portion,
- wherein each said re-entrant elongate groove forms a reduced thickness portion of said sheet of polymer material that is bent to form an outer corner joining said polymer jamb portion and each respective integral polymer architrave portion, and
- wherein each said groove when formed has opposed overhanging edges with undersides that are spaced from said reduced thickness portion and a cross section selected such that the undersides are spaced from said reduced thickness portion when formed as said outer corner, so as to provide an elongate chamber adjacent the outer corner.
A door frame member comprising
- a polymer jamb portion integrally formed between polymer architrave portions, and being formed from a sheet of polymer material, wherein said sheet of polymer material includes re-entrant elongate grooves formed therein, between said polymer jamb portion and each respective integral polymer architrave portion,
- wherein each said re-entrant elongate groove forms a reduced thickness portion of said sheet of polymer material that is bent to form an outer corner joining said polymer jamb portion and each respective integral polymer architrave portion, and
- wherein each said groove when formed has opposed overhanging edges with undersides that are spaced from said reduced thickness portion and a cross section selected such that the undersides are spaced from said reduced thickness portion when formed as said outer corner, so as to provide an elongate chamber adjacent the outer corner.
Dependencies are inferred from the claim text.