US856605A - Packing. - Google Patents

Description

No. 856,605. PATENTBD JUNE 11, 1907.

W. E. SANDERS.

PACKING. APPLICATION FILED MAY 11,1906.

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my improvements, with UNITED STATES PATENT OEETCE.

W'ALTER E. SANDERS, OF CLEVELAND, OHIO, ASSIGNOB. TO THE 'MECHAN- ICAL RUBBER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NElV JERSEY.

PACKING.

Specification of Letters Patent.

Patented June 11, 1907.

To [Ll] whom, it Tim-y cancel-11 Be it known that l, WALTER E. SANDERS, a citizen of the United States, and a resident of cloth, usually duck, held. together by a of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and usetul Improvement 1n Packing,

of which the followj ing is a specification, the principle of the i invention being herein explained and the 1 best mode in which I have contemplated applying that principle, so as to from other inventions.

My invention relates to packing for use in the stuffing-boxes about steam engines and the like.

Such invention relates more particularly to packing in which triangular strips of packing material are used, such strips having their beveled or inclined faces adjoining, so that when pressure is applied, one will slide upon the other.

Said invention has, as its object, certain improvements in packing of the above sort, and to this end consists of means hereinafter fully described and particularly set'forth in the claims.

TheanneXed drawing and the following description set forth in detail certain means embodying the invention, such disclosed means constituting but one of various forms in which the principle of the invention may be used.

In said annexed drawing: Figure 1 represents a portion of a packing ring embodying the ends thereof appearing in transverse cross-section; while Fig. 2 is a similar transverse cross-section of a slightly modified form of packing also enibodying my invention.

In the type of packing, to which reference has already been made, two triangular or wedge-shaped strips are inclosed together with a superimposed cushion strip of absorbent material within an outer braided covering or casing. be accomplished by this mode of construction are the even distribution of the pressure throughout the entire length ofthe packing when such packing is compressed, and the taking up of wear as the several strips decrease in size with use. The cushion strip has been made ordinarily of twisted flax or like material in order that it might act as an absorbent for oils to assist in tion of the bearing, and to permit the free distinguish it 1 action of the wedge-shaped strips upon each other. These latter have heretofore been made of superimposed parallel plies or layers rubber compound. The uppermost of these layers, of course, is very narrow, and (hillculty in the use of the packing under consideration has been occasioned by this very feature; for, under the influence of steam and hot water it has been found that this first ply will become easily detached in spite of the intermediate layer of rubber intended to secure it to the ply next below. The first ply having thus come off, the succeeding ones rapidly follow, and the whole strip soon disintegrates. It is to overcome this trouble that I have devised the form of packing now to be described.

As will appear from an inspection of Fig. 1, my improved form, of packing follows the general arrangement of parts already indi cated. Thus I inclose within an outer cov ering or casing A, a cushion strip B, and, ad-

The results sought to 1 the lubricajoining the under side of the same, two simi lar wedge-shaped strips C with their inclined faces in contact. Cushion strip B, in the form shown in this first figure, is made up of a strip of cloth rolled upon a core I) of fibrous material to form a cylindrical body. This strip B, resting as it does upon the upper llat face of one of the wedge-shamed sections, C, will obviously, upon the application of pressure, tend to force such sections apart or laterally toward each side. Strip B is itself, by virtue of its construction, adapted to be molded as it were by this same pressure to conform with the space left for it, and to transmit pressure uniformly throughout its length to the strips below. \Vhere such strip, as illustrated in Fig. 2, is composed wholly of fibrous material, preferably twisted flax strands, these results are perhaps even better secured.

Each of wedge-shaped strips C is made out of a single piece of cloth that is wrapped around itself so that no part of the wedge can be loosened and become detached from the rest of the wedge without tearing the cloth used in its construction. A layer of rubber or rubber composition is placed between successive convolutions of the piece of cloth as the latter is wound up and when the desired size has been reached the wedgeshaped form is given to the roll by subjecting it to pressure in a su table mold. In the assembled strip of packing a suitable lubricant, as finely divided graphite, is introduced between the contacting faces of the two wedge-shaped strips, as also about cushion strip B; while casing A is preferably coated with the same :rnaterial.

My improved packing is, of course, used in the same way as ordinary packing, being either cut into suitable lengths to fit within the stuffing-box or else coiled into the same as found most desirable. In this connection it may be further stated that for certain situations it may not be found necessary to employ a cushion layer B, but the pressure of the gland, as the stufling-box is tightened, may be applied directly to the face of one of the wedge-shaped strips with the same result as has been noted before. seen that by the construction of those wedgeshaped strips above described, produce a form of packing that utilizes to the fullest the advantages inherent in the use of such strips while securing therefor much greater durability and efficiency of operation.

Having'thus described my invention in detail, that which I particularly point out and distinctly claim is 1. In a packing strip, the combination of It is accordingly I 'ing formed of a two moldedv wedge-shaped strips having their inclined faces in contact, each of said wedgeshaped strips being formed of a sheet of cloth wrapped around itself with a layer of rubber composition interposed between successive convolutions.

2. In a packing strip, the combination of two wedge-shaped strips having their inclined faces in contact, each of said strips besheet of cloth Wrapped around itself with a layer of rubber composition interposed between successive convolutions,

such strips being thereupon molded into such wedge form.

3. In a packing strip, the combination of a strip composed of yielding material, two wedge-shaped strips adjoining said first strip, said wedge-shaped strips having their inclined faces in contact and being respectively formed of a single piece of cloth wrapped around itself and held together by a rubber compound and subsequently molded into such wedge form, and a casing inclosing the whole.

Signed by me, this 7th day of May 1906.

WALTER E. SANDERS.

Attested by- G. IV. SAYWELL, JNo. F. OBERLIN.

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