US2715825A - Mantles - Google Patents

Description

Aug. 23, 1955 H. F. ZIMMERMAN MANTLES Filed Deo. '7, 1951 INVENTOR Haro/d 717 Z/'mme/wm/ United States Patent O MANILES Harold F. Zimmerman, Louisville, Ky., assignor to the United States of America as represented by the Secretary of the Army Application December 7, 1951, Serial No. 260,555

5 Claims. (Cl. 67--98) (Granted under Title 35, U. S. Code (1952), sec. 266) The invention described herein, if patented, may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

The present invention relates to mantles for gasoline burning devices, such as lanterns, and more particularly to a mantle incorporating improved means for anchoring the same to a burner tip.

Heretofore, asbestos drawstrings have commonly been provided in the open end or mouth of the mantles used on gasoline burning devices for contracting the mouths of the uncalcined mantles into iirm gripping engagement with the burner tips to anchor the same thereto. In order to secure best results with mantles of this type, it was necessary to arrange more or less uniform pleats or tucks in the open mouth of the mantle as the mouth was being contracted by the drawstring. This operation was often awkward to perform because of the relatively inaccessible position in which the burner tip's in gasoline lanterns and other gasoline burning devices frequently are located. The mantle of the present invention elim- .'1"

inates these disadvantages of existing mantles by substituting an elastic binding means for the asbestos drawstring heretofore used to anchor mantles to burner tips. Moreover, since the elastic binding means of the present invention disintegrates by the time the mantle has been completely calcined, the mouth of the mantle thereafter is free from external binding forces and the internal strains that might be set up thereby so that the improved mantle has a longer useful life.

Accordingly, an object of the invention is to provide a new and improved mantle for a gasoline burning device, such as a lantern, which mantle is constructed with an elastic open end or mouth for snugly gripping the burner tip upon which it is placed.

Another object of the invention is to provide a new and improved mantle for a gasoline burning device, which mantle has a substantially uniformly pleated or tucked open end or mouth and an elastic loop-shaped binding means in the mouth to maintain the uniformity of the pleats or tucks and to contract the mouth into lirm gripping engagement with the burner tip upon which the mantle is placed.

Another object of the invention is to provide a new and improved mantle for a gasoline burning device, which mantle has a substantially uniformly pleated or tucked open end or mouth and an elastic loop-shaped binding means in the mouth to maintain the uniformity of the pleats or tucks and to contract the mouth into rm gripping engagement with the burner tip upon which the mantle is placed.

A further object of the invention is to provide a new and improved mantle for a gasoline burning device, such as a lantern, which mantle is bound to a burner tip by a carbonaceous looped binding means that is elastic at normal temperature and disintegrates at the ambient temperatures prevailing at the burner tip upon completion of the calcining of the mantle and during normal Patented Aug. 23, 1955 operation of the burner so that the mantle is free of external binding forces which might be present if the mantle were bound by a non-disintegrable binding member having a different coeicient of expansion than the body of the mantle, such, for example, as an asbestos drawstring.

A still further object of the invention is to provide a new and improved mantle for gasoline lanterns or the like which is inexpensive to construct, more convenient to place in position for use and more durable than conventionally constructed mantles.

These and other objects, advantages and capabilities of the invention will become apparent from the following description and accompanying drawings in which:

Fig. 1 is a side elevational View of the improved mantle of the present invention before the volatile fabrics have been burned out of the same.

Fig. 2 is a vertical cross sectional view of the improved uncalcined mantle of the present invention mounted on a burner tip.

Fig. 3 is a diametrical sectional view on the line 3 1 of Pig. 2.

Fig. 4 is a diametrical sectional view similar to Fig. 3 but showing the mantle after it has been calcined and;

Fig. 5 is a side elevational view of the improved mantle of the present invention after it has been calcined.

The mantle indicated in its entirety by the number 16 has a body 12 of woven or knitted fabric which may be generally similar to the body of a conventional inverted mantle and may be manufactured in much the same manner from material of the same type. in other words, the body of the mantle is of generally slightly elongated globular shape, and it has an open end or mouth 14 along which the body fabric is turned inwardly to form a hem 16 (Fig. l). Since considerable shrinkage occurs in the body of a mantle during the preliminary process of burning out the volatile portion of its fabric, the body 12 and mouth 14 are generally made at least double the size which it is desired that they ultimately assume.

An asbestos drawstring laced through the mouth of the mantle has heretofore been used to contract the mouth into firm gripping engagement with a burner tip for holding the uncalcined mantle on the burner tip. In place of this drawstring, the improved mantle of the present invention has a looped elastic binding means 18 somewhat smaller in size when relaxed than the outside of the burner tip which is indicated at 20 in Fig. 2. This binding means may comprise one or more loops of elastic thread interlaced, threaded or otherwise intertwined in the hem 16 (Fig. 1), for example, in much the same manner as asbestos cords have heretofore been interlaced in the mouths of mantles, or it may be inclosed within the hem or fixed to the mouth of the mantle in any other manner found convenient. inasmuch as the binding means 18 has a relaxed size less than the perimeter of the uncalcined mantle 16, the mouth 14 of the mantle will be contracted when the looped binding means 13 is threaded through or otherwise secured therein. In order to take up or accommodate for this contraction, the woven material at the mouth 14 preferably is arranged in substantially uniform pleats or tucks which allow the mouth to expand when the mantle is to be placed over the burner tip 20. These tucks or pleats are shown in a somewhat exaggerated manner at 22 on the drawing.

It will be apparent, therefore, that the improved mantle of the present invention is much more readily placed on a burner tip than a conventional mantle particularly when the tip is in a relatively inaccessible location because the need for attempting uniformly to arrange tucks in the mouth of the mantle while a drawstring is being tightened and the need for tying a knot in the tightened drawstring ventional asbestos drawstring, the improved mantle of the present invention is also superior to conventional mantles becausethis elastic binding means permits a more uniformr shrinkage of the mouth around the burner tip than is possible when a mantle is anchored by means of Va drawstring. VAs a'result, internal stresses in the Y calicined mantle are greatly reduced or are entirely absent.

In lorder toV obtain' this advantage, the elastic` binding means 18 preferably comprises a loop of elastic thread made `from synthetic rubber-likematerial which melts and forms -a mild adhesive of suicient strength to hold'the mantle 10 on the burner tip 20 during initial burning out Vof the mantle and which disintegrates in the presence of the temperature prevailing atv the burner tip upon com pletion of burning out of the mantle or during initial burning of gasoline vapor in the mantle. Thev mantle 10,

like conventional mantles, shrinks considerably duringthis initial burning lout process, and its mouth 14 tends to con-form to the shape of the burner tip 20-which is pro- Vvided with an outwardly rounded or aring periphery forming a retaining ledge or ridge 24 which prevents the mouthof the calcined shrunken mantle from slipping o l the` bur-ner tip 20 after the binding loop` 18 disintegrates. Such disintegration ordinarily occurs by the time heating of the mantle has been continued long enough completely tovbu'rnout the volatile materials therein, but, if it has not occurredV by then, it will occur almost immediately after the gasoline burner is turned on to burn gasoline vapor in the` mantle.Y The tucked or pleated mouth 14 is then-completely free of external restraint such as that aiorded by the asbestos drawstrings now used to anchor conventional unburned'mantlestoburner tips. Since there are no4-external restraints on the mouth 14 of the mantle I0, it will shrink moreI uniformly around the burnerl tipA 20 and with less likelihood of internal strains being set upAin the mantle. In addi-tion, more even combustion v occurs: atl the mantle and it hasV for this reason among others al longer-,useful'life. Y

- YAnother reason for its longer,V usefulk life results froml theV fact that thertucks or pleats 22l are free to open Vup, itnecessary, toprovide for contraction of thev mouth 14l whereas this isV not true-when the mouth of' a mantle is bonndby anon-disintegrable means, such as an asbestos drawstringJ of the type heretofore ycommonly used, even though-this cord may expand somewhat.A Such a draw'- sti-ing, nevertheless, continues' to-have a binding elect' on the tucks or pleatsin the mouth of the mantleand, furtheri more, the; rate of expansion of asbestos cordn is less than the rate of' expansion' lof the mouth ofy the mantle' so thatwanadditional bindjngforce is set upinA the mouth of a mantley by the asbestosV drawstrings heretofore used;

present invention.

` While a preferred embodiment of the inventionV has been; shown and described, it willr be apparent that numerous'valiations andemodications thereof may be madewithout departingl from the underlying principles of the Tliisf'fi'sl entirely absent' from'V the improved mantle of the CQ invention. It is desired, therefore, by Vthe Vfollowing claims, to include within the scope of the invention, all such variations and modifications by which substantially the results of the invention may be obtained through 'the use of substantially the same or equivalent means. 1

What I claim is: i

l. A mantle for a gasoline Vburner comprising a woven sack-shaped body having a mouth adapted loosely to t over the tip of said. burner, and a loop of elasticV carbonaceous material xed'in the mouth of said mantle to lcontract the said mouth into rm gripping engagement with a burnertip when it is placed on the latter.

2. A mantle for a gasoline burner comprising a woven Y sack-shaped body having a hemmed mouth adapted loosely t over the tip of said burner, andy one or' more looped Y l elastic carbonaceous strands intertwined in the hemmed temperature range to which it is raised when calciningV of the mantle is' initiated and. distintegrable at the temperature to which it is raised before completion of calcining of the mantle, said' loop contracting the said open end into rm gripping engagement with the burner tip upon which the' uncalcined mantle is placed.

4. A mantle for a gasoline burner comprising a sackshape'd body of woven uncalcined material having an open endadapted loosely: to fit over the tip of said burner and to shrink sullicientlyV when calcined' to bring said open end into firm encompassingv engagementV with said tip,

and a loop of synthetic rubber-like material secured in.

the open end. of said mantle of a relaxed size less than the size of the burner tip upon which the mantle is to be used to contract the Open end of 4the uncalcined mantle into firm engagement with a burner tip when ,it is placed' on the latter.

5. A mantle for' a gasoline burner comprising a sackshaped body of woven uncalcined. material havingl an open'end adapted loosely to fit over the tip of said burner, said uncalcined mantle being adapted to shrink sutticiently when calcined to bring said open endI into firm encompassing engagement with. said tip, a plurality of substantially uniformly arranged pleats in the open end of the said uncalcined mantle to contracty the size of the said end, and a loop of elastic carbonaceous material threaded through said pleated end to maintain the uniformity of said pleats and' to contract the said open end of the uncalcinedV mantle into firm gripping engagement with the burner tip upon which the mantle is placed.

References Citedin' the l'e of this patent UNITED STATES'PATENTS 935,241. Weyer Sept.` 28, 1909 2,506,706 Colle May 9, A1950` FOREIGN PrrnN'r'sv 211,792 Germany July 12, 1909

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