US408592A - Burner for central-draft lamps - Google Patents

Description

.' Patented Aug. 6, 1889.

Z. DAVIS. BURNER FOR. CENTRAL DRAFT LAMPS.

7 UNITED STATES PATENT FFICE.

ZEBULON DAVIS, OF CLEVELAND, OHIO.

BURNER FOR CENTRAL-DRAFT LAMPS.

SPECIFIGATION- forming part of Letters Patent No. 408,592, dated August 6, 1889.

Application filed iugust 388- 1 0 all whom it nuty concern:

Be it known that I, ZEBULON DAVIS, of leveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Burners for Central- Draft Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will en able others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in burners for central-draft lamps.

The objects of my invention are to make the upper portion of the burner-tube smaller than its lower portion, and to form through the shoulder which extends around the tube below the small perforations a series of holes, through which a large quantity of heated air is allowed to pass, and to place inside of the smaller end of this burner-tube aperforated open ended conical tube, which serves to break up the currents of air as they rise around the sides of the burner, and thus cause a greater portion of the air which is rising through the central-draft tube to rise upward and strike against the heated spreaders which form the top of the burner-tube, and thus become thoroughly heated because it passes through the small perforations in theburnertube.

The accompanying drawing represents a vertical section of a lamp-burner which embodies my invention.

A represents the lamp-bowl, B the central-draft tube provided with an internal supporting-bead, and O the burner-tube. This burner-tube is made large enough at its lower end to snugly fit the inside of the centraldraft tube and is supported in position upon the bead in the tube B. At that point in this burner-tube C where the tube is reduced in size an inclined shoulder G is formed, and through thisshoulder are made a series of air-holes II. This shoulder and the air-holes are located a suitable distance below the upper end of the central-draft tube, so that all of the air which passes through these openings must pass between the heated upper end of the draft-tube and the outer side of the Serial No. 282,763. (No model.)

burner-tube, and thus be heated to a higher degree before reaching the flame. The smaller perforated upper end of this burner-tube extends a suitable distance above the top of the central-draft tube and has its upper end closed by the two spreader-plates I J, which are secured together, the upper one of the plates beingthe larger. The function of thg upper larger spreader-plate is to offer a second surface for the rising air-currents to impinge against, forcing them into the flame, whichis deflected outwardly, and which, meeting and mingling with the air-currents rising through the cone and up near the sides of the chimney, is caused to burn very white without odor and remarkably steady.

Inside of the lower solid portion of the burner-tube is secured the conical perforated tube 0, which is open at both of its ends, and which serves to break up the currents of air which rise through the central-draft tube into the lower end of this burner-tube, and thus prevent the air which is rising through the openings H from-forming currents of sufficient force to interfere with the steadiness of the flame. This cone also serves to direct the rising current of air which passes through its upper open end against the center of the under side of the lower spreader-plate,where it is highly heated before-it spreads out into the chamber formed by the upper end of the burner-tube and escapes through its fine perforations. The upper end of this open-ended perforated cone extends only above the openings H in the shoulder and up to or below the lower line of the perforations in the burnertube, as its only object is to break up and heat the currents of air which are rising around the inner sides of the burner-tube, and which would pass through the openings II in the shoulder. The outer portion of the burner upon which the lamp-chimney rests will be made of the shape shown.

Having thus described my invention, I claim I 1. The combination of the lamp-bowl and the central-draft tube with a burner-tube consistin g of the lower imperforate portion which snugly fits the draft-tube and the smaller upper perforated portion, the tube being provided with a series of perforations H, which TOO extend around the side of the burner below the small openings in its upper end, so that the air which rises through the perforations II will be heated between the outer side of the perforated part of the burner-tube and the inner side of the upper end of the centraldraft tube, substantially as shown.

2. The combination of the lamp-bowl and the central-draft tube with the perforated bu rnertube provided with a series of openings H below the fine perforations in its upper end and the open ended conical tube which is secured in the lower end of the burner-tube and in a different Vertical plane from the fine perforations in theburner-tube, substantially as described.

ZE'BULON DAVIS. Witnesses:

F. L. ALCOTT, W. B. WHITING.

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