Back to results
US 4,420,103 AGranted
Backpack
AssigneeWilderness Group Inc.
InventorDonald C. Douglass
Life of this patent
Estimating the term…
Abstract
A backpack with integral frame formed of plastic sheets without metal supports. A load carrying sack having a front face, a pair of shoulder straps and a waistband, and a support pad mounted on the front face, the pad comprising a foam sheet of a first height, a stiffener sheet of a second height less than said first height, and a protective sheet, with the three sheets attached to the front face by stitching forming vertical panels and upper and lower horizontally pivoting structures with a stiff intermediate structure.
Claims5
A backpack with integral frame, including in combination:
- a load carrying sack having a front face, a pair of shoulder straps and a waistband;
- and
- a support pad mounted on said front face;
- said pad comprising
- a foam sheet having a first height,
- a stiffener sheet having a second height less than said first height, and
- a protective sheet,
- with said stiffener sheet, foam sheet and protective sheet attached to said front face by stitching,
- with a plurality of vertical rows of stitching defining vertically disposed panels, and
- a plurality of horizontal rows of stitching defining upper and lower sandwich structures of front face, foam sheet and protective sheet, and an intermediate sandwich structure of front face, stiffener sheet, foam sheet and protective sheet.
7 more elements
Dependencies are inferred from the claim text.