US1542427A - Nonheat-conducting covering - Google Patents

Description

June 16,` 1925; n

' H. R. WARDELL NONHEAT coNDUcTING covERING Filed oct. 16, 1925 4f V A lhull V//A INVENTOR lilatented .lune i6, E925.

UITED STATES HENRY n. WARDELL, or NEW YORK, N. Y., AssIGNoR To JoHNs-MANVILLE, moor;-

\ rom'rnn, A CORPORATION oF NEW YORK.

NONHEAT-CONDUCTING COVERING.

application led October 16, 1923. Serial No. 668,793.

To all whom t may. concern.'

Be it known that I, HENRY R. lWARDELL, a citizen of the United States of America, residing at New York city, in the county and State of New York, have invented certain new and usefullmprovements in Nonheat- Conducting Coverings, of which the following is a specification.

My invention relates tothe prevention or reduction of any undesired transfer of heat hy radiation or conduction, and comprises an improved structure which may he used as avcovering for pipes and other articles which' have heated surfaces, the loss of heat from which is to he kept at a minimum, or which havecool surfaces, the transmission of heat to which is to be prevented as far as possible. Accordingly my invention may be used on steam pipes to reduce the loss of heat in the contained steam, or on brine pipes to prevent the atmosphere from unduly warming the' artificially cooled liquid in said pipes.

'lhe object of the invention is to secure an eiicient covering of this kind, i. e., one of low heat conductivity, which shall also be low in cost. of manufacture as a result of the simplicity of its constructionand process of manufacture, and low in lirst cost of raw materials.

The best formof structure embodying my invention at present known to me, together with certain modifications thereof, are illustrated in the accompanying sheet of drawings in which:

Fig. 1, is a detail plan view of a sheet of paper prepared for use in my invention, parts being broken away.

Fig. 2, is a detail cross section of a sheet such as shown in Fig. 1, but shown on an exaggerated scale and in a somewhat diagrammatic manner.

' Fig'. 3, is a perspective view of a section of pipe covering in a process of manufacture employing thefpaper shown in Figs. l and 2.

Fig. 4, is a detail cross section of a portion of a structure such as will be formed by piling up the sheets ofFigs. l and 2 with' intermediate unpe-rforated sheets between.

Figs. 5 and ,6 are viewssimilar to Figs. 1 and 2 but illustrating a modification, and Fig. 7 is' a detail cross section of a structure formed by superposing sheets such as are shown in Figs. 5 and 6.

Throughout the drawings like reference `characters indicate like parts. l representsa 'from the plane of the main sheet.

.'lhese'tahs or aps may he bent through angles of i8@ degrees as illustrated in Fig. 2, but it is only necessary that they he bent far lenough so that when subjected to compression along lines at right angles to the plane of sheet l, they will not bend hack into holes ,if a series of' such sheets as above described are superposed with interspersed unperforated sheets 7, as indicated in Fig. al, a cellular mass will he formed containing a multitude of closed air spaces 8 formed by the holes 2, and others, 9, formed by the spacing away of proximate portions of an adjacent sheet 7, hy the talos 3, et' any particular perforated sheet l.. Such a huilt up mass can also be formed by rolling a perforated sheet l, and an unperforated sheet T, into a tube 6, as shown in Fig. 3. Such tube can then be further dealt with in the manper usual in making commercial pipe cover- 1n in forming a plurality of tabs 3, around each opening or hole 2, as illustrated in Fig. l, (where the holes are shown square) it is advisablel to make the holes polygonal in shape, a tab heilig heut up from each side of the polygon, hut if only one tab or lap 5, is

yto be formed from each hole 4, as shown in ,Figs 5 and 6, the outlines of the holes may lhe approximately circular, the sheet being uncut along a small arc of each circle so thatthe cut portion forming the tab may he bent on that uncut portion as on a hinge.

Sheets having perforations with tabs outwardly bent therefrom of the form shown in Figs. 1 or 5, or otherwise, may he rolled up, or piled up to form a cellular mass without the use-of intermediate, or interspersed, unperforated sheets 7, so long as the holes in adjacent sheets, or adjacent coils of the same sheet, are kept out of register one with another. Such a cellular mass formed of sheets perforated as shown in Figs. 5 and 6 is illustrated in cross section in Fig. 7. ln such construction each hole 4 and thev space sui rounding its corresponding tab, or flap 5, would form one closed cell.

While I prefer to use asbestos paper, or.

thin asbestos felt cut as shown in the drawings, and with the tabs Yformed as described, as the main element of .my non-conducting covering, it is obvious that sheets of other material might be used and that the manner of forming and bending the tabs or flaps here illustrated could be further modified so long as the Aprinciples of operation here outlined are retained.

In any case Where the underlying principles of my invention are employed there Will be formed a body which is a poor conductor of heat both because ot' the low conductivity of the material used and the great number of closed air cells existing in said body,- air being a very good heat insulator. The sheets of the type illustrated in Figs. l and 5, can be rapidly and cheaply made by passing plain sheets o'f paper through proper rolls, and the formation of the cylindrical pipe covering by Winding up such sheets on a Inandril is also a rapid, simple and cheap operation. Consequently my invention produces an eiiicient non-heat-conducting covering at a low cost.

Having described my invention I claim:

l. A non-heat-conducting covering Vcoinprising, in combination, a plurality of super-posed sheets of material of relatively low heat conductivity, which said sheets have a plurality oi' portions partly severed from 'the main body to form a plurality of small tabs which are bent away from the planes of the sheets far enough to forni means of spacing apart from said perforated sheets proximate portions of adjacent sheets.

2. A. non-heat conducting covering consisting of "the combination of a plurality of superposed sheets of material of relatively low heat conductivity, some of Which sheets have a plurality of portions partly severed from the main body to form a multiplicity of small tabs which are bent away from the planes of said sheets, While other sheets interspersed between those first mentioned are devoid of such tab formations, whereby a multiplicity ot' closed air cells are produced in the structure so formed.

3, As an element in a structure for use as a non-heat conducting covering, which structure is composed of a .multiplicity of superimposed sheets of material of relatively low heat conductivity and substantially cri-extensive in relative positions, a sheet ot' material of the character described having a plurality ot holes formed therethrough by partial severance of small portions of the material from the main body ot the sheet and the bending ot' such partially severed portions away from the plane of the sheet, said holes being distributed with substantial uniformity throughout said sheet.

HENRY R. lVARDELL.

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