Pre-Fabricated Grease Duct System
AssigneeVan-Packer Company
InventorsRobin Rediger, Billy J. Sims, Jason M. Kerner
Life of this patent
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Abstract
The present double walled grease duct includes a tubular outer shell surrounding a tubular inner liner, wherein a spacer is positioned perpendicular to the walls of the outer shell and the inner liner. The spacer can include a plurality of vertical metal strips extend from a top edge of the spacer to the bottom edge of the spacer, wherein the top edge of the spacer contacts the walls of the outer shell and wherein the bottom edge of the spacer contacts the walls of the inner liner. The metal strips resist the different rates of thermal expansion between the outer shell and inner liner ultimately preventing the collapse of the inner liner under pressure from thermal expansion.
Claims11
A double walled grease duct comprising:
- an outer shell including an outer tubular body having an outer first end and an outer second end;
- an inner liner including an inner tubular body having an inner first end and an inner second end, wherein the inner liner has a cross-sectional area less than the cross-sectional area of the outer liner, wherein at least a portion of the inner liner is positioned within the outer liner;
- and
- a spacer including a rectangular planar body including an outer edge and an inner edge, wherein the outer edge contacts an inside surface of the outer liner, wherein the inner edge contacts an outer surface of the inner liner, wherein the spacer includes a plurality of metal strips extending from the inner edge to the outer edge.
Dependencies are inferred from the claim text.