US 4,307,764 AGranted

Bulk material transport bag

AssigneeBulk Lift International Incorporated

InventorPeter J. Nattrass

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Abstract

A fabric bag for transporting bulk materials, especially granular materials, comprising four generally rectangular side walls, joined to and extending upwardly from a generally rectangular bottom wall; each side wall is joined to the adjacent side walls by a seam which includes two pleats formed inwardly of the side wall edges, the pleats being sewn together, leaving a terminal strip projecting into the bag interior. A lifting loop is located at the top of each seam; a terminal strip is folded over each lifting loop, the seam pleat is folded against one of the side walls, and the pleats, loop legs, terminal strips and side walls are fastened to one another by zig-zag anchor stitching extending from the tops of the walls at least to the bottoms of the lifting loop legs. Preferably, the bottom wall and two of the side walls are formed of a single U-shaped piece of material and the bottom wall is attached to the other two side walls of the bags by seams that are continuous with the side wall seams.

Claims7

Dependent claims

In a bag for transporting bulk materials, of the kind comprising at least four generally rectangular side walls joined to and extending upwardly from a bottom wall, all formed of a woven fabric, the bag having an open top and a plurality of lifting loops each including a bight portion and two legs, with the loop legs secured to the bag at its top, the improved construction comprising:

at least four side wall seams joining the side walls of the bag, each seam including two pleats, each pleat formed inwardly of a side edge of one of two adjacent side walls, the pleats being sewn together throughout approximately the height of the bag to form the seam, with a terminal strip of each side wall projecting from each seam, each terminal strip being wider than the leg portion of a lifting loop;
each lifting loop being secured to a corner of the bag by folding the top portion of each of the two terminal strips at that corner over a substantial length of one leg of the lifting loop and anchor stitching each terminal strip to the adjacent portion of its side wall, through the covered leg portion of the lifting loop, with the anchor stitching extending from the top of the bag at least to the bottom of the lifting loop leg in each instance;
the seam pleats being folded against one side wall of the bag, at each top corner where a lifting loop is mounted, and the anchor stitching for the lifting loops also extending through the folded pleats.

Dependencies are inferred from the claim text.