USRE3579E - Improvement in the manufacture of elastic packing - Google Patents

Description

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Uurrnn S'rA'rEs PATENT NATHAl5T IEIj JENKINS, or" nos'rou, MASSACHUSE'HS.

lslnuovsmsufm'rus MANUFACTURE OF ELASTIC PACKING.

Specification forming part of Letters Patent No. 54,554, dated May 8, 1866 reissue No. 3,519, dated August 3, 1869.

1'0 all whom it may concern:

Be it known that I, NAQTI-IANIEL JENKINS, of Boston, in the county of Suffolk and State of Massachusetts, have invented a. new and useful Elastic Packing for Joints and Valves Exposed to Destructive Flnids;-and I do hereby declare that the following full,- cleai, and exact'description of the construction and operation of the same is suflicient to enable others skilled in the art to make and use the same without other invention or discovery.

The nature of the-invention consists, first,- in constructing the packing of refractory eurths,'or earthy and stony matters, mingledwith rubber and such other materials as are necessary to vunaanize the rubber, in such quantity that the earthy or stony matter shall more than a year, 1 claim to .have discovered a tight indestructible elastic packing for these purposes.

It will be seen from the following 'formulas that a leading feature of the composition is that it contains large quantities of earthy material, such as French chalk, or talcose matter, a very refractory material; Paris-white,

a substance which is decomposed only at very high temperature, and in presence of air or gases of combustion, or of strong acids with steam, and is not readily fused; and litharge, which assists in wllcaniziug and does not tend to decompose the other ingredients at the temperatures to which the composition is {)ulverization and iususccptibility to heating Soapstone is indicated as an ingr'edieut by the use of French chalk. Paris. hite indicates the use of other earthy carbonates.

1n the selection of earthy or stony matter the choice would be governed by facility of The substance of the invention is the employment for a packing of auearthy powder ofrcfractory quality, intimately mingled with vulcauized rubber, and constituting forty per centI of-t'he compound. With the following ingredients the proportions would be within the following limits: Pure r'nbb'er, from twenty to twenty five per cent; pure gum-shellac,

from ten to twenty per cent; pure Paris-- the fluidto be resisted is less penetrating, and

increase-the quantity of Paris-white, French chalk, litharge, and shellac when it ismore penetrating. A

- One hundred parts of the above substances, mingled within the percentages'given, will be comparatively indestructible in the presence of coal-oil, steam, or hot water, and will preserve their elasticity and texture for a long time. r V

The following table of proportions new in usewith coal-oil, steam, and hot-water, respectively, have given'favoralrl'e results,' andvI am inclined to consider them thebestat;

taiuable for their respective purposes.

I Percentages for coal-oil. 21 32 03151 Rubber 215; 24g, -24; Shellac 16 11 16a Paris-white 26g 21?,

French chalk 16 24;}; 2 Litharge 15% 13% 1 Lamp-Mack H 3; 2 2 Sulphur f- 11 2 2 Parts 100. 100 100 I do not, however, confine myself to' these exact proportions, but consider the composi'- tion most accurately stated by the limitations given before.

The ingredients other than the rubber are a to be finely powdered and intimately mixed ber.

r siirfaeeof the rubber and rolled with it between cold rollers until they are thoroughly incorporatedwith thesnbstance of the rub The mass is then to be molded in iron nioldsof proper shape and subjeeted to a'high vulc'anizing l1eatsa-y that due to a steampressure of sixty to seventy-five pounds, or, if desired to be very hard, even more-tor from twenty to forty-five minutes.

'I claim as my invention and desire to secure by Letters Patent- 7 e I 1. An elastic packing composed of atleast four-tenths of finely pulverized refractory they are then. to be spread on the earthy or stony material, .i'ntimately niingled with andheld together by rubber prepared for ,vulcanizing, and then vulcanized, as and for the'purpose described.

2. The composition of the ingredients and within the proportions above set forth, substantially as and for the purpose described.

3. The employment of French chalk or equivalent talcose mineral; substantially in the manner andd'or the purpose described. e

I 1 NATHL. JENKINS. Witnesses:

Tnos. WM. CLARKE,

GEO. R. CLARKE.