US478639A - Frank rhind - Google Patents

Description

F. BEIM. ARGAND LAMP.

l 'Patented July 12', 1892.

(No Model.)-

INVENTO' R ATTORNEY.

'nos noms Pefrsns co, womxrmm, wAsmnarm. r f

JMW

Nrran STATESv vBe'rrzitrr OFFICE. l

FRANK RHIND, OF MERIDEN, CONNECTICUT, ASSIGNOR OF ONE-HALF TO THE EDWARD MILLER tr COMPANY, OF SAME PLACE.

ARGAN D LAM P.

SPECIFICATION forming part of Letters Patent No. 478,639, dated July 12, 1892.

Avpllcation tiled November 29, 1890. Serial No. 373,061. (No model.)

To all whom, it may concern:

Be it known that I, FRANK RHIND, a citizen of the United States, residing at Meriden, New Haven county, Connecticut, have invented a new and useful Improvement in Argand Lamps, of which the following is a specification.

My invention relates to Argand or centraldraft lamps, and is intended to so regulate and direct the air supplied to the llame as to improve combustion and to prevent the burner or lamp from becoming unduly heated.

In the drawings, Figure l represents in vertical section so much of an Argand lamp asis necessary to illustrate my invention. Fig. 2 is a horizontal section through the line at, Fig. l. Fig. 3 is a top plan View of the dome or outer deflector removed from the lamp.

The same letters refer to like parts in the several views. y

A designates the body of an Argand lamp;

B, the inner and C the outer wick-tube; D, the

Wick; E, a volute partition; F, a spreaderpost; G, a spreader consisting of the disks g and g; H,an outer detlector or dome; h, perforations in the dome H; I, a chimney-gallery; J, a foraminous burnerfskirt.

In the example of my invention illustrated in the drawings the lamp-body A, concentric Wick-tubes B and C, chimney-gallery I, and skirt J are of usual or any desirable forni. Any desired means for adjusting the Wiek'D may be used. Vithin the inner air-supply tube of large Argand'lamps it has been customary to insert a plurality of concentric tubes held in position by interposed radial partitions. The function of these tubes is to break up and divide the ascending air-current and to prevent eddies in the air-supply tube. They are objectionable as somewhat expensive and as the radial partitions tend to divide or serrate the llame. In other constructions corrugated coiled strips are used. These are open to the same objections as being relatively expensive and difficult to manufacture and as forming substantially radial partitions.

tute for this plurality of concentric tubes a volute or spirally-formed partition E, (shown in horizontal section in Fig. 2,) the inner coil of which is preferably adapted to form a In the present device I substi` socket or seat for the spreader-post F. This volute partition E may be made either of imperforate sheet metal, as shown in Fig. l, or it may be foraminous, as indicated in Fig. 2. In either case it is found in practice to effectually prevent eddies and cross-currents in the inner air-supply tube and to insure an even and regular delivery of air to the inner mantle of the flame.

The function of the spreader-post F is to support the spreader G, Which, as shown, consists of two concave-convex foraminous disks g and g', preferably of light sheet metal, with their concave sides toward each other and with their edges in contact and preferably secured together. It is obvious that the foraminous disks g and g may either or both be made of another form than the cancavoconvex form shown. It is only necessary that they be separate disks connected together at their outer edges.

Heretofore spreaders or buttons have frequently been made of heavy cast metal. These are objectionable as absorbing a large amount of heat. This heat by radiation and by convection through the Wick-tube is conveyed to the oil, rendering it more fluid and increasing the flow through the wick, thereby causing the flame to climb To prevent eddies above these buttons, holes have been drilled through their periphery, thereby permitting a small quantity ofY air to pass up through the button.` I have, however, found in practice that it is better to provide alarge number of small holes through the button than a much smaller number of relatively large holes. It is commercially impracticable, owing to the expense, to drill large numbers of small holes through a heavy button. Hence I have been driven to the use of lightperforated sheet metal, which can be cheaply produced by means of dies. This is found to give a good result, butis open to the objection that it is easily bent out of shape by careless handling. My present device obviates this objection and provides a spreader which absorbs and radiates but little heat, permits a portion of the air to pass upward through it, is sufficiently strong, and can be economically manufactured. This form of spreader is preferable to a perforate cylinder as offering much IOO less obstruction to the light-rays. In practice it is found to be hardly visible through the flame. The disks g and g', being fora'minous, serve to deflect the flame and a portion of the ascending air, while another portion of the air passes thrbugh the spreader G. Ot' this latter portion a part is fedto the inner mantle of the iame above the spreader, while the rest acts to keep the chimney and lamp from overheating by increasing the amount of cool air which passes through the inner air-supply tube.

By the use of the spreader G and dome H, both constructed as shown, a tenuous brilliant tulip-shaped flame is produced,while at the same time the burner and lamp are kept considerably below the usual temperature.

I have shown the tube B as serving the double function ot' inner air-supply tube and inner wick-tube, such being the usual construct-ion. It is evident, however, that the use of separate tubes for these purposes would not conflict with any part of my device. It is equally evident that my device is applica ble to a form of construction in which air to supply the inner mantle of' the flame is introduced abovethe top of the oil-fount instead of through the bottom of the oil-fount, a's shown in Fig. I, and that other mechanical 'changes may be made Without departing from my in- Vention. VIt is obvious, also, that the various features of my device would he useful if' separately applied*e. g., that either the spreader G or the dome H might be advantageously used in a lamp provided with an i'mperforate dome or with another form of innerdeflector, respectively. n

When in the claims I speak of a verticallyconvo'lute partition, it will be understood that I refer to a partition preferably made from au integral sheetof thinmetal convoluted or rolled upon itself, as clearly shown in Fig. 2 of the drawings.

I am aware of certain British patents in which two, three, or more separate perforate deftectors or buttons are mounted upon a Vertical rod at some distance apart. Each of these detlectors is open to the objections already named-z'- e., it must either be so heavy as to absorb and radiate a large quantity of heat or be structurally weak. In my device two light perforate disks are connected together at their outer edges to form a single deflector or button, thereby combining a maximum of strength with a minimum of thermal capacity. I do not claim as my present invention two or more separate perforate deflectors, but a single deiiector consisting of two perforate disks connected at their peripheries.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is as follows:

l. In an Argand lamp, the combination of an inner air-supply tube a nd a vertically-con- Volute partition within said tube, the spiral space between the convolutions of said partition being clear and unobstructed, substantially as described.

2. In an Argand lamp, the combination of an inner air-supply tube and a vertically-convolut'e foraminous partition within said tube, the spiral space ybetween the con-volutions of said partition being clear and unobstructed, substantially as described.

3. An inner air-deflectorof' an Argand lamp, consisting of' two foraminous disks connected at their outer edges, so that a portion of the air which strikes against the lower side of said deiiector may be deflected outwardly and another portion permitted to pass upward through said defiector, substantially as described.

FRANK RHIND. Vitnesses:

Guo. L. COOPER, H. E. SMITH.

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