Plural chamber sheet metal gas burner and method of manufacture

Claim 1

A gas burner for use in a gas fired cooking grill of the type adapted to carry a horizontally disposed rack for supporting food and having gas supply inlets, the improvement comprising, in combination, a pair of generally H-shaped stamped sheet metal shells generally U-shaped in cross-section, one comprising a top shell and the other comprising a bottom shell, said top and bottom shells being secured together by a peripheral lip on one of said shells being bent over a peripheral edge on the other of said shells so as to form a permanent seal around substantially the entire periphery of said H-shaped shells and thereby form a gas chamber therein, said top and bottom shells each being formed with a depressed planar portion which extends transversely across the width of the shell approximately midway between the ends thereof so as to divide each top and bottom shell into a pair of generally U-shaped shell sections, said transverse planar portions being arranged to abut one another when said top and bottom shells are interconnected so as to form a gas-tight seal thereby defining two separate generally U-shaped hollow burner chambers for connection to separate gas inlets, a plurality of gas outlet apertures formed in a wall of said bottom shell around substantially the entirety of its H-shaped configuration for directing a gas flame upwardly over said peripheral lip on said top shell, and a pair of gas inlet apertures formed in said bottom shell on opposite sides of said transverse planar portions for connection to respective gas inlets.