US960638A - Inverted incandescent mantle. - Google Patents

Description

c. K. HARDING. INVERTED INGANDESGENT MANTLE. APPLICATION FILED JAN. 21, 1910.

960,63. Patented June 7,1910.

money by PATEN FFICE.

, CHARLES KNOX,HARDINGI, OF. CHICAGO, ILLINOIS.

INVERTED INCANDESCENT MANTLE.

9 Specification of Letters Patent. Application filed January 21, 1910. Serial No.

Patented June 7, 1910.

To all whom it may concern:

' Be it known that I, CHARLES KNOX HARD- ING, 'a citizen of the resident of VVoodlawn, city of Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in Inverted Incandescent Mantles, of which the following is a specification.

The invention relates generally to incandescent structures for lighting made by what is generally known as the Welsbach process which consists of impregnating a knitted fabric of cotton with solutionsof the refractory earths which are to constitute the finished mantle. The dimensions of this impregnated fabric areusually more than'100 per cent. greater than that of'the finished product after the cellulose andother volatile matter has been burned out. But this large structure is fashioned and formed approximately to such shape as will produce the desired form of the finished mantle after it has been shrunken.

My invention relates particularly to an improved construction of inverted mantles which have a cylindrical body portion and a semispherical closed end portion which is usually the lower end, and an open'end through which the flame is applied Prior to my invention, inverted mantles have generally been made from tubular knitted fabric and the closed end most commonly formed by the methods known as gathering and goring. In the former case the lower end is formed by gathering the lower edge of the tube and drawing it to the center. This resulted in a thickening or bunching of the goods at and around the center of the lower portion of the mantle. This is objc tionablc considering that the central zone of the lower portion of an inverted mantle-"1s ar'j particularly valuable area and should not be prevented from reaching its highest efliany obstructions or thickenmg at that point. To obviate this, especially for heavier mantles made of coarser thread, goring has been employed; that is, from two to siX curved seams have been sewn through two adjacent layers of fabric from a point above the bottom where the diameter was to be retained to a point in the central axis at the bottom. These gores permit a quantity of the stock to be cut out, but the seams themselves interfere with the incandescence at the central point, which is the most abun- United States, and a dantly supplied with gas from its most favorable location in the center of the flame.

Among the objects of my invention is to produce an inverted mantle of more symmetrical shape and having a large area around the'central section of its-lower portion consisting of a uniform thickness of fabric without seams whereby this most useful portion of an inverted mantle can be uniformly and entirelyraised to the highest incandescence.

To attain this and other ends features of construction, the arrangement and configuration of theseveral parts, as will appear hereinafter more fully described .and claimed and shown in the accompanying drawings, which illustrate forms of man tles embodying my invention and in which Figure 1 shows a front elevation of a short length of tubular fabric severed on a curved "line and forming the segment shaped projections B-B dependin Fig. 2 is a plan view il ustrating a double segment shaped piece of single' thickness fabric which is to form a considerable part of the semispherical end portion of the completed mantle. Fig. 3 shows the upper tubular portion A andcthe single thickness section C, united at its edges with the lower depending edges of the tubular fabric A, by a seam 0. Fig. 4 is a section taken on line 44 of Fig. 1. Fig. 5 is a section taken on line 5-5 of Fig. 3. Fig. 6 is a perspective view of a finished fabric mantle, made in accordance with my invention and folded in a way that may be employed where it is intended to be placed in a Hat envelop for the market. Fig. 7 is a section taken on line 7'"7 of Fig. 6. Fig. 8 shows a side elevation of a finished burned off mantle attached to a carrying ring and indicates one View of the portion formed from the section C and illustrates the position of the seam c. p

I do'not wish to confine my invention to the precise shapes or relative size of what I haveshown in the drawings.

The section referred to as the double segment shaped section may closely approximate the outline of an ellipse and in general a variety of oval shapes might be employed and referred'to as ovals or ellipses, but it is necessary to produce the best results in the finished mantle as well as to facilitate their manufacture to have the respective edges which are to be united by the seam of as I employ the at its lower end. 7

nearly the same length and configuration as possible.

Asillu'strated in the drawin s, the segment shaped projections B-B, le t. attached to the tubular portion, correspond in size, shape and linear dimensions of its curved edge to one of the segment shaped halves of the section O. In this precise construction the section C would constitute a the semispherical closed end of t e'mantle a roximating a quarter of a sphere, but to ma e proper allowance for the difference in the amount of shrinkage of knitted fabrics in a "lineal and transverse direction, the shape of the section Cas well as the configuration of the depending segments BB- may bevaried in such a way that the three when seamed together, will constitute an approximately semlspherical bottom portion 1n the finished burned out mantle, while in the fabric mantle it ma be desirable to provide somewhat greater ineal dimensions in the direction of the greatest shrinkage.

Having now described one embodiment of my invention, what I claim is:

1. An inverted fabric mantle consistin of an open topped body portion of tubular abin of a double segment shaped section of fa ric united to the aforesaid segment shaped projections by a seam extending ortion of ceases around the circumference of the doiiblesegi:

cylindrical body portion constructed of a tubular fabric having two curved segments dependin from its lower end and a double segment s aped section of a single thickness of fabric having its circumference attached to the two curved edges of-the dependin segments whereby a semispherical shaped closed lower end of the mantle is formed by said double segment shaped section and said two depending segments.

3. An inverted mantle consisting of an open topped body portion of tubular knitted fabric and having two segment shaped projections from its lower end, said lower end being closed by a double segment shaped section of a single thickness of mantle fabric having its circumference attached to the lower end of said body portion-by a seam whereby said seam does not interfere with the lower central portion of the semispherical closed end. a

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses, this 18th day of January, 1910.

CHARLES KNOX HARDING.

Witnesses:

NANETTA L. MCOALL, LEONOBE FRANKENSTEIN.

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