US Patent 10352558 Premixed stamped inner flames burner with eccentric injection venturi

A burner assembly for a cooktop includes a base portion having one or more vents and an eccentric stem. A cover portion is received on the base portion to define a mixing chamber disposed between the cover portion and the base portion. The cover portion includes a plurality of fuel ports opening inwardly into a centrally disposed combustion chamber. A venturi mixer is received through the eccentric stem and is configured to provide a primary-air and gas mixture to the mixing chamber as supplied from the cooktop. An aperture is disposed through an upper surface of the cooktop and is configured to pivotally receive the eccentric stem of the base portion for pivoting the burner assembly on the cooktop.