US2072543A - Packing - Google Patents

Description

March 2, 1937. Y v J. 1 CRANE 2,072,543

PACKING I Filed Jan. 2, 1932 Patented Mar. 2, 1.937

PATENT OFFICE PACKING John T. Crane, Maywood, Ill., assignor to Felt Products Mfg. Co., Chicago, Ill., a corporation of 'Illinois Application VJanuary 2, 1932, serial No. 584,541

Claims.

'This invention relates to improvements in packing, and has particular relation to a :duidtight packing such as is used in pumps and the like.

5 The primary object of the invention is to provide an improved form of packing consisting of a core of fibrous material, or the like, and an outer covering of metallic foil folded around said core.

Other objects and advantages of the invention will appear from the following detailed description taken in conjunction with the accompanying drawing, in which:

Figure 1 is a top plan view of a portion of a l5 machine for manufacturing a packing material embodying the invention;

Fig. 2 is a fragmentary transverse'sectional view, on an enlarged scale, taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary'transverse sectional view, on` an enlarged scale, taken on the line 3--3 of Fig. 1;

Fig. t is a fragmentary transverse sectional view, una still larger scale, taken on the line 4 4 ofi'g. 1;

Fig. 5 is a. stillfurther enlarged transverse sectional and perspective view of a completed section of packing embodying the invention; and

Fig. 6 is aperspective view of a completed "50 packing member embodying the invention and formed into 'a'rlng such as is suitable for use in the packing glands of pumps and the like.

The construction and operation of a machine adapted to make a packing material embodying the present invention are illustrated and described herein to a limited extent only, to assist in providing a full and clear understanding of the nature and form of such packing material. 'I'he said machine constitutes the subject matter 40 of my co-pending application, Serial No. 656,961,

filed February 15, 1933, as a division of the instant application.

Referring to the drawing, the packing material `embodying the invention is preferably made by 45 means of a machine such as that illustrated in part in Fig. 1, comprising a stationary folding member 48. 'Ihe packing material comprises a core 5| of fibrous material or the like and a plurality of thicknesses of metallic foil 54 which are foldedaround said core member. The folding operation is accomplished by drawing the core material 5| and the metallic foil 54 through the said folding device 48 -by suitable draw-feeding means or the like (not shown). Thecore material is in rope form and the metallic foil in strip form of the proper width toy envelop the corre fully, as hereinafter shown in greater detail. Both the core and covering materials are sup-y plied to the machine in extended lengths from suitable spools, reels or the like (not shown) and rthe machine operation is a continuous process.

Any desired number of thicknesses of the ,foil 54 may be used and one or more of the foil strips are preferably drawn through a supply of graphite solution or other suitable lubricating material.

The foil strips 54 are drawn between upright vertical guides 65, and then between horizontal rollers 66, 66 all of which are supported from a stationary base or the like. After passing between the rollers 66, 66 the foil strips are drawn along a. flat table-like member 61 between adjustable edge guiding strips 68, 68 and thence into the foldingmember 4B. The members 61 and 68 are carried by suitable stationary supports and it is through the member-61 that the folding member 48 is supported. 'Ihe core material 5l is drawn over a grooved wheel 69 which is loosely and pivotally supported by a pin 10 carried by a small pedestal member 1I which is also secured to a vixed support. 'I'his core material is then drawn through a slot in a stationary guiding member 13 which is carried by the supporting member for the rollers 66, 66 and thence through the grooved end of an offset guiding member 14 carried by one of the edge guiding strips 68 for the foil strips 54. 'Ihe somewhat circuitous path through which the core material 5| is drawn in this manner provides the necessary friction for preventing excessive slack in the ma.- terial as it enters the machine.

As the core lmaterial 5| and the covering strips 54 of metallic foil are drawn through the fold- Y driven to assist in -the feeding of the material,

as disclosedv in myaforesaid co-pending application. Thepacking material is thus shaped andA compacted as desired. It may also bev coiled up in spiral coils of any desired length and such ceiling may be accomplished either in the form- `ing member 48, the covering strips are gradually vformed around the core, three successive stages..

ing machine or by separate means. Such coiling means may be utilized to feed or assist in the feeding of the material through the forming machine.

5 When the packing material is thus coiled up, it may be cut up into sections of one or more turns each for formation into rings of the desired axial length. The cross-sectional appearance of the material as it leaves the machine is indicated in Fig. 5, which illustrates the manner in which the metallic foil strips 54 have been folded around the core 5| and the latter formed and compressed to produce a packing material of the desired size and shape. This view also shows ,l5 in perspective the manner in which the outer edges 0f the foil strips 54 are disposed on the outside of the completed packing material, these edges extending longitudinally of the material and substantially parallel to the longitudinal axis of the core. The coils of material of this size and shape may then be additionally formed and compressed by punch dies to obtain the exact dimensions and shapes required. A completed ring which has been finally formed in this manner is illustrated in Fig. 6. As shown in this figure, the rings may be formed' with tapered or other surfaces to fit any desired type of packing glands or the like. Due to the nature of the core material 5I and that of the thin metallic foil covering 54, the packing material is susceptible of formation into any desired shape and the completed rings are of such nature that they may be used to form absolutely fluid-tight joints in any desired type of construction. The material has the advantages of both fibrous and metallic packings and many of the disadvantages of these two types are not encountered. The material is substantially impregnated with the graphite solution or other lubricating medium through which one or more of the strips of the foil covering are drawn in the manner hereinbefore described. 'Iight joints may therefore be provided without involving any substantial friction between rotating parts and the like. The material used for the core of the packing of this type may be relatively inexpensive, as it is fully protected by its metallic covering. It is well known that fibrous materials deteriorate rapidly when they come in contact with various liquids, acids, vapors, etc., but these disadvantages are eliminated in the packingof the present invention because the fibrous core is protected by the metallic covering.

For ordinary uses the core material may be any inexpensive brous material, `such as cotton, hemp, jute, felt, etc., and the metallic covering of the packing may be formed of lead foil. For high temperature service non-burning materials may be used, such as asbestos for the core and a covering of aluminum foil or the like.

Packing material made according to the present invention is particularly advantageous in that it provides an exceptionally good wearing surface to be placed in contact with moving parts such as rotating shafts, reciprocating rods and the like.v The formation of the packing with the foil covering longitudinally folded around the same produces a material in which the edges of the foil strips are exposed along only certain lines extending longitudinally of the packing strip, and when the packing material is put into use it is naturally so placed that these edges are out of contact with any moving parts. The .foil surfaces which are placed in contact with u the moving parts areunbroken and afford no opportunity for the foil to flake oif or become mutilated in any other manner. Therefore, the material gives better results in service and has a longer life than packing materials of the prior art which do not embody these advantages.

Such advantages will be particularly noticed when the packing material made in accordance with the present invention is compared with prior art materials in which a. covering of metallic foil or the like is applied in the form of spirally or helically wound strips. In the latter type of materials the edges of the foil covering are exposed on all sides of the packing materialshortening its life, but often produces injurious eects on other parts of the machinery in which such packing glands are used. It has been found by actual experience that particles of foil which are broken off when using packing materials with spirally wound coverings find their way into valves and other parts of the machinery, where deleterious effects are caused thereby.

'Ihese effects are eliminated by the use of the packing material of the present invention, which presents unbroken surfaces of foil to the moving parts, as above explained. It will be apparent also that the present type of packing is superior to those of the prior art in that leakage is more readily prevented thereby, due to the truer wearing surface presented toward the moving parts in packing glands.

'I'he method of making packing material according to the present invention is also highly advantageous over prior art methods by reason of the fact that the material 'may be produced more rapidly and consequently at less expense.

From the foregoing it will be seen that the present inventionprovides an improved type of packing material, and that an advantageous and economical method of making the same has been fully disclosed.

While only certain specific embodiments of the invention have been shown and described herein, it will be readily understood by those skilled in the art that various changes and modifications in the details of construction-and arrangement of parts may be made without departing from the spirit and scope ofthe invention as set forth in the appended claims.

What is claimed as new and is desired to secure by Letters Patent, therefore, is:

1. A packing material comprising a core consisting substantially entirely of fibrous material, and a covering of metallic foil extending substantially parallel to said core and. entirely enveloping the same in substantially uniform folds all following the contour of said core, the edges of said covering extending longitudinally and parallel to the longitudinal axis of said core and overlapping each other.

2. A packing material comprising a heat-resistant fibrous core and a metallic foil covering 3. A packing material comprising a brous core and a lead foil covering therefor extending substantially parallel to said core and entirely enveloping the same, the edges of said covering extending longitudinally and parallel to the longitudinal axis of said core.

'4. A packing material comprising an asbestos core and an aluminum foil covering therefor extending substantially parallel to said'core and lo entirely enveloping the same, the edges of said covering extending longitudinally and parallel to the longitudinal axis of said core.

5. A packing material comprising a fibrous core and a plurality of strips of metallic foil covering therefor extending substantially parallel to said core and entirelyenveloping the same, the edges of said covering extending longitudinally and parallel to the longitudinal axis of said core.

JOHN T. CRANE.

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