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US 8,171,700 B2Granted
Hollow metal door
OwnerMichael Barnesinventor
Life of this patent
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Abstract
A hollow metal door using hollow structural sections with closed cross section, along with the method for making same, is described herein.
Claims8
A door, comprising:
- An inner structure comprised entirely of hollow structural sections, and
- An outer shell comprised of at least two joined sheets;
- Wherein said outer shell consists of a first sheet and a second sheet, in which said first sheet is an elongated channel section having two right angles surrounding at least four sides of said inner structure, said second sheet is flat, and wherein two opposing edges of said first sheet are joined to the abutting edges of said second sheet.
A hollow metal door, comprising:
- An inner core;
- An outer core;
- and
- An outer shell;
- Wherein said inner core and said outer core are comprised of a plurality of joined hollow structural sections, and
- Wherein said inner core and said outer core are joined to each other, and to said outer shell.
3 more elements
A method of fabricating a door, comprising the steps of:
- Joining a plurality of hollow structural sections to form an inner core and an outer core;
- Joining said inner core and said outer core to form a combined core;
- Bending a first sheet to accommodate insertion of said combined core;
- Joining said combined core within said first sheet;
- and
- Joining a second sheet to said first sheet.
3 more elements
Dependencies are inferred from the claim text.