US433472A - Henry w - Google Patents

Description

(No Model.)

H. W. JOHNS.

NON-CONDUCTING GOVERIN'G.

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i UNITED STATES PATENT OFFICE.

HENRY W. JOHNS, OF NEIV YORK, NQY.

NON-CONDUCTING COVERING.

SPECIFICATION forming part of Letters Patent No. 433,472, dated August 5, 1890.

Application tiled February 12, 1890. Serial No. 340,165. (No model.)

To all whom it may concern:

Be it known that I, HENRY IM. JOHNS, a citizen of the United States, and a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Non-Con ducting Coverings, of which the following is a specification.

My invention relates to a new and useful non-conducting covering for pipes, boilers, and other heated surfaces; and it consists in making the covering from successive layers of soft, compressible, and exceedingly-porous sheets or slabs of wood pulp, which are to be iireproofed and preferably waterproofed.

In the drawings, Figure l illustrates one form of my invention, in which I show a section of pipe-covering formed of a plurality of layers of reproofed wood pulp. Fig. 2 illustrates the same as shown in Fig. l, there be- 4ing also present an interlayer of asbestus or other fire-proof sheet or cement. Fig. 3 illustrates a pipe-covering in process of ceiling. Figs. ft and 5 illustrate corrugated and indented sheets or slabs.

In making` my improved covering I first form the wood pulp into sheets or slabs A, of such thickness as may be preferred, by a felting or pulping process, whereby I secure a product possessing great porosity and softness. This sheet is then subjected to a treatment in any preferred manner with iireproofing materials, preferably in liquid form, and preferably using' the ireproofing compound of borax and boracic acid, with or without zinc, for which I applied for Letters Patent of the United States January 7, 1890, the said application being Serial. No. 336,196. Then the sheet has been moistened by its absorption of the liquid iireproofing material, it may be easily rolled into cylindrical forms upon a suitable mandrel of substantially the diameter of the pipe to which the covering is to be applied, and when dry it may be sawed or cut into halves foreasy application to the pipes; or instead of first maliin g the sheets or slabs and then treating them with the fireprooing liquid, they may be treated therewith While yet in the plastic state, and then before the sheets have dried they may be rolled or otherwise formed into cylindrical or other desired shape.

In Fig. 2 I illustrate a covering the same as that shown in Fig. 1, excepting that there is applied to the sheet A, before it is rolled into cylindrical form or otherwise shaped, a sheet, layer, or coating B of lire-proof substance, which Will be rolled up with the sheet, thus forming an interlayer or alternate layer with it in the completed covering. I prefer to use a sheet of asbestus paper or a layer of asbestus cement for this interlayer B; but any other suitable re-proof or practically fireproof material may be used instead. Ialso prefer, especially if the interlining sheet B is not used, to line the interior or surface of the covering with a layer or sheet O of pure asbestus when the covering is to be used on very hot surfaces.

In Fig. 3 I illustrate a sheet of the fireproofed pulp with interlayer as seen after having been rolled up on a mandrel. I also sometimes treat my sheets or slabs either be' fore they are formed into the desired shape4 or afterward, as preferred, with any suitable waterproofing material, and this treatment may extend throughout all the layers forming the covering or be applied to certain ones only.

My covering, as I believe, possesses certain advantages over any other known. It is very light in weight, quite smooth in exterior surface, very inexpensive, very easy to manufacture and apply, very clean, and it possesses innumerable air-spaces, partly in the body of the material and partly in the spaces between contiguous sheets, which render it a superior non-conductor- Moreover, my coverings, being composed of wood pulp, are When ydry (in which form I prefer to treat them with the iireproofng compound) more easily, economically, and thoroughly impregnated with the fireproofing liquid than any other material suitable for the purpose.

The exterior of my covering may be covered with canvas, paper, or such other exterior jacket or binder as may be preferred, and it maybe decorated with paint or other suitable substance.

I illustrate' my coverings as made into cylindrical forms only 5 but they may be flat or IOO of such other shape as desirable to iit the surface to be protected, in which event the sheets with or Without an interlayer will be cut into smaller sheets and superposed one upon the other.

The separate sheetsor slabs maybe indented or corrugated, as shown in Figs. 4 and 5, or the interlayer or interlayers maybe indented or corrugated to increase the number of aircells. The several sheets, layers, or coils ot' the same sheet or the ends thereof may be confined in place by any suitable adhesive material or by metallic bands, staples, or rivets,I or by sewing, nailing, or otherwise.

I claimm 1. A nonconducting covering composed, essentially, of superposed layers of soft porous Wood pulp Iireproofed, substantially as set forth.

2. A non-conducting covering composed, essentially, of superposed layers of soft porous Wood pulp ireproofed, and an interlayer or interlayers of practically fire-proof material, substantially as set forth.

3. Anon-conducting covering composed, essentially, of superposed layers of soft porous Wood pulp reproofed, and an interior lining of nre-proof material, substantially as set forth.

Signed at Nen*7 York, in the county of New York and State of Newsr York, this 29th day of January, A. D. 1890.

HENRY W. JOHNS.

Nitnessesz PHILLIPS ABBOTT, JOHN W. I-IIGHFIELDT.

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