US1698660A - Packing - Google Patents

Description

HUGH T. STEWART, OF NEW YORK, N. Y ASSIGNDR TO ME TALASTIC INCL, OF JERSEY CITY, NEW JERSEY, A COBPORATIONUF NEW JERSEY. I

racnme.

ll'o Drawing.

This invention relates to packing such as may be used in various mechanical devices for the purpose of sealing joints or connections between parts which may or may not have relative movement.-

An object of the invention is to provide an improved packing which when used between relatively moving parts offers a minimum re-- tivit ,whichis elastican plastic, and-which is re ativelyinexpesnsive. Other objects and advanta es will apparent from the following escription of a practical form of the invention and the novel features will be pointed out in claims.

Y The packing comprises lubricating oil, asbestos fibre, graphite, and babbitt or other suitable anti -friction metal or alloy. Any suitable lubricating oil may be used but it 80 should preferably have a viscosity of not less than 30.0'and not more than 80.0 (Engler) at50 C. and not more than 5.0 and less than 1.0 at 180 C. The specific gravity at 1 5 C. should not be less than .500 or more than .980 in order to obtain the best results. The flash point should also preferably be above 200 C. and less than 350 C. in an open pan test. standard A.- C. transformer oilis a very satisfactory product for the oil component of the improved packing.

The asbestos fibre should be in the form of shreds, referably varying from about 3 mm. in ength and 0.25 mmrin diameter to about 7 mm. in length and 1.5 mm. in diameter.

The graphite, which forms a solid lubrican-t, should be finely divided or co'mminuted', preferably in the form of flakes not larger than about 2 mm. in diameter and 0.05 mm. in thickness. It has been found that Dixon ,#2 graphite proves very satisfactory as the graphite component of the packing.

. The metal or alloy component of the packing should be finely divided, such as in the It has been found that the by the action of a suitable cutting tool upon Application filed-July as, 1922. Serial in). 577,761.

forms of chips preferably not lar er than 5 mm in length, 3 mm. in width, an 0.5 mm. 1n thickness, and diminishing to pulverized form. The slightly rough edges of the metallic chips enable the asbestos to hold the chips 1n position. By the term chips l mean a form of particles which may be read- 11y obtained from commercial Babbitt metal, as distinguished from particles which must be specially formed. The'chips are obtained a piece of commercial Babbitt metal and the result is that the'chips are formedwith sharp edges which, when the chips are mixed with the fibre, will help to shred the fibre.

The preferred proportions in which the components are mixed are as follows, the portions being given by-weight:

, Parts. Asbestos 14 Oil 7' Metal Graphite 11 Any suitable metal or alloy may be used, but should preferably be babbitt, lead, or similar metals or alloys. A very satisfactory anti-friction alloy for this purpose is the following:

Tin 83.75% to 84.25%,copp'er 6.75%, antimony 8.75% to 9.25%, iron not' over 02%, lead not over .02%.

Any of the usual Babbitt metals mayalso be used. v

In the preferred preparation of the mixture, the carded asbestos fibre andoil are mixed and heated to about 100 'C.,'after which the babbitt is added and mixed, then thegraphite. The temperature should always be less than the fusion temperature of the metal or alloy. After the component materials. have been thoroughly mixed 'the may be cooled, and the mixture is then ready for use. It has plasticity such that it can be packed into any desired shape or size of cavlty. There is enough elasticity when molded and compressed to cause it to fit closely to the packed parts with an even pressure and maintain the close fit for an extended period. The graphite and oil form a superior lubricant for moving parts and the capillary action of the small particles draws oil continuously to the bearing surfaces. The oil also revents caking of the graphite. The asestos, which is of itself of such a nature as M0 to withstand such chemical actionas' might by little without waste. The

venient, efiicient, durable, easi y and quickly applied and relatively inexpensive.

removed from a stufiing box it may be easily v acking is conpulled apart and returned to its original loose condition. I j 1 p It will be understoodthat the proportions gi venherein are those which have been found to be the mostsatisfactory and that this is .for the purpose ofexplaining the natureof the invention.

Obviously various minor changes .in proportions and equivalents of the component arts or the manner of mixing may be ma e by those skilled in the art within the principle and scope oithe inven tion. I

Iclaim: .1. A stufiing box packing material comprising fanintermixture of small chips pf abbitt, comminu'ted ra hite, asbestos fibres,

and lubricating oil w ie has been heated to parts 7 comminuted graphite, 14 parts of asbestos fibres, and 7 parts of lubricating oil, the prov to a temperature less than a temperature at material comatemperatur'e ef'approximately 100 C. and

' less than the temperature at which the bab bitt fuses.

2; A stutfing box packingrmaterial com-,

prising an intermixture of approximately68 of small chips of babbitt, 11 parts of portions being by weight.v 3. A stufling box packing prising an mtermixture oi babbitt chips,

prising an intermixture o graphite, asbestos fibres andlubricating oil in such" minor roportions that the resulting mass is loose mtexture.

4. A stufiing box packin material combabbitt chips.

acking is loose' non-com-- When,

' neeaeeo flake graphitefasbestos fibres and A. standard transformer oil. 1 r 5. The method of preparing a acking materialwhich com'prises'heating as estos fibres and oil to approximately 100 C. then adding 'babbitt chips and commiiiuted. graphite an mixm I 6. file method of preparing a packing material which comprises mixing fibre and oil, addingw articles of anti-friction metal and mixing again, and then adding a solid lubricant and mixin a ain.

.7. The metho o preparing a acking material which comprises mixing re and-oil, heating the'mixture to about 100 (1,,- adding particles of vanti-friction metal and mixing again, and then adding a solid lubricant and mixiI iIgha-gain.

e method of preparing a packing material which comprises mixing fibre and oil, heating the mixture to about 100 0., adding particles of anti-friction metal and mixing again, then adding a solid lubricant 'and mixing again, and maintaining the temperature -throughout'at less than the fusion temperature of the metal. 1

9. A loose packing material comprising a mixture ofchips of anti-friction metallic material, fibre, graphite, and oil in such minor proportions that the resulting mass is loose in texture.

10. A stufling box packing material'comprising an intermixture of small'chips. of babbitt, comminuted graphite, asbestos fibers, and lubricating oil Which has been preheated which the babbitt fuses in such minor proper tions that the resulting mass is loose in texture.

In testimony whereof I have hereunto set my hand.

' HUGH T. STEWART. v