Gaseous fuel burner

Claim 1

A butane gaseous fuel burner adapted to produce a relatively constant air-fuel mixture under wide fuel pressure variations comprising: a. a fuel receiving housing having a side wall and a closed dome forming a fuel chamber, said dome including an upwardly and inwardly tapering ring section formed about an axis and a central mounting boss, said ring section having an external frusto-conical ring surface, b. a plurality of circumferentially spaced-apart fuel discharge bores extending through said ring section and communicating with said fuel chamber, c. a cap mounted on said boss and projecting radially and downwardly over said ring surface, said cap having a lower surface extending in generally parallel relation to said ring surface and being spaced therefrom, said ring surface and cap lower surface defining a circular mixing area therebetween and a mouth immediately open to ambient and communicating into said mixing area, and d. a bore in said cap for each of said fuel discharge bores and aligned axially therewith, said cap bores being approximately ten times the diameter of said discharge bores and said spacing between said cap lower surface and said ring surface being approximately twice the diameter of said cap bores, said cap bores extending through said cap at an angle to said ring section axis of greater than approximately 120* , e. said cap bores being positioned with respect to said side wall whereby air moving upwardly along said side wall turns less than 90* for discharge through said cap bores, and f. whereby fuel directed through said discharge bores travels upwardly and outwardly across said mixing area and out said cap bores.