US2012711A - Packing material - Google Patents

Description

Aug. 27, 1935.

c. K. DILLINGHAM ET AL PACKING MATERIAL Filed Oct. 15, 1952 ATTORN EY Patented Aug. 27, 1935 UNIT-LED STATES PACKING MATERIAL Charles K. Dillingham, Plainfield, N. .L, and Phillip D. :Cannon, Philadelphia, Pa., assignors to. J ohns-Manville Corporation,

New York,

, N. Y., a corporation of New York Application October 15, 1932, Serial No. 637,952 1 Claim. (01. 154-455) This invention relates to apacking material and particularly to one adapted for use as a gasket between plane surfaces.

The invention comprises a woven, heatresist- 5 ant, gasketing material containing a central pertion woven integrally with the outer portions and adapted to be more readily penetrated by a conventional fastening element than the said outer portions.

The invention is illustrated in the drawing, in which Fig, 1 shows a front view of a preferred form of gasketing tape with the yarn removed from some of the reenforcing wires, for clearness of illustration; and

Fig. 2 shows a front View of a similar tape with the central portion cut out at intervals, to

provide open spaces.

In the figures, there is shown a tape with outer portions I adapted to contact closely with surfaces that are to be packed and a central portion 2 that is adapted to be penetrated by fastening means, such as'a bolt, more readily than the adjacent outer portions.

The outer portions contain both longitudinal or warp strands 3 of yarn and transverse or filling strands 4 interwoven therewith. The central portion contains a smaller number of strands per unit of area or length than the outer portion and, in the embodiment illustrated, contains strands extending in one direction only, namely, transverse or filling strands 4. Furthermore, the filling strands in the form illustrated are spaced farther apart, that is, are less numerous per unit otlength of the tape, than are the filling strands in the outer portions.

The yarn used is preferably heat-resistant.

We have used to advantage asbestos yarn which, in the strands constituting the warp, is relatively soft and not wire-reenforced, and, in the strands composing the filling, may contain wires 5, such as fine brass wire which is frequently used to reenforce asbestos yarn.

As used, the tape is impregnated with a suitable packing or friction compound 6, such as a conventional one containing a large proportion of rubber and a vulcanizing agent.

To make the insertion of large bolts or fastening means through the central portion very convenient, the central portion may be cut out at intervals, to provide the spaces 1 positioned to correspond to the locations of the bolts or other fastening means in a gasketed assembly.

The method of manufacturing the product of the invention is illustrated below, in the case of a gasketing tape suitable for-use in'gasketing the head plate of a locomotive f a The weaving is done by aloo'm including in the assembly a yarn beani', two or more harnesses for the warp strands; a reed, a shuttle, and a cloth beam, in addition to the usual accessories and driving means. The strands that are to compose the warp in the finished fabric are spacedby the harness mechanism or otherwise into two parallel bands that correspond to the outer portions l in the finished tape, to leave-a space or gap between them, in what is to be the central portion of the woven product. The filling strands. are woven with the spaced bands of Warp yarn. When it is desired to space the filling strands farther apart in the central than in the outer portions, the outer bands of warp threads maybe alternately depressed or elevated so that the shuttle carrying the filling yarn engages and interweaves the filling yarn with the warp yarn in one of the said bands only, during selected passages of the shut-,

For example, the loom'may be operated so that the shuttle weaves the filling strand with tle.

both of the spaced bands of warp yarns, then with only the right of the said bands, then with both bands, then with the left band only, then with both bands, and so on, to give a relatively open structure in the central part of the tape. considered unnecessary to illustrate the loom, in-' asmuch as it is conventional.

After the tape is woven, it is calendered, to smooth the surfaces and adjust the size and shape, and then is impregnated with suitable material of type commonly used to impregnate a gasket or packing. Thus the tape may be passed through a solution of rubber and vulcanizing agent there- It is for in a volatile'solvent and the volatile,;solvent later removed by evaporation.

When the tape is to be used for gasketing under conditions of elevated temperature, it is not necessary tovulcanize the tape before it is installed for 7 use, inasmuch as the prevailingtemperature during use will cause vulcanization. However, if desired, the tape may be subjected to an elevated temperature for a substantial period of time adapted to cause vulcanization of the rubberbeand serve to hold the outer portions tightly in position. Since they extend practically at a right angle to the length of the tape, they establish the spacing of the outer portions of the tape from each other and prevent excessive spreading apart of these portions under all circumstances. When the strands in the central portion are spread apart to allow for the insertion of a bolt or the like therethrough, the central portion around thebolt still remains'relativelythin; there is thus provided a distinct advantage over conventional types of tape gasketin which a very'thick portionof the gasket around the fastening bolt may be produced by spreading apart closely woven gasket material to allow the insertionof the bolt therethrough. The

central portion, as well as other portions in the preferred product, are heat-resistant and, at the same time, are compressible, non-corroding, and resilient.

The details that have been given are for the purpose of illustration and not restriction, and many variations therefrom may be made without departing from the spirit and, scope of the invention.

What we claim is:

A packing tape comprising longitudinally extending strips of woven fabric constituting the outer portions of the tape and filler strands integrally woven with the said strips and securing them together in spaced relationship, some of the filler strands extending through the space between the strips and. being arranged in the said space as a. plurality of series containing each relatively closely spaced strands and being spaced from the to receive fastening means of the type of a bolt.

CHARLES K. DILLINGHANL. PHILLIP D. CANNON;

' next of the said series, to provide a space adapted 20

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