Ebonite hose

Details Ebonite hose Ebonite hose

2000-10-20

2001-10-09

Brinson, Patrick (Department: 3752)

Pipes and tubular conduits

Flexible

Distinct layers

C138S140000, C138S174000

Reexamination Certificate

active

06298884

ABSTRACT:

FIELD OF THE INVENTION
The present invention is directed towards a hose. Specifically, the hose is reinforced with ebonite to provide the hose with the desired physical characteristics.
BACKGROUND OF THE INVENTION
Ebonite is a known rubber compound containing a high sulfur content, typically compounded with 30 to 50% by weight sulfur, having a high Shore A hardness. Ebonite compounds have been used in tank linings for chemical products and in other applications where hardness and impermeability are desired. For example, U.S. Pat. No. 4,469,729 discloses that in the past, for flexible articles such as belts, hoses, and diaphragms, the inner surface of the article was harden by ebonite formation. This was done to improve wear resistance, reduce friction, and provide for a barrier effect.
U.S. Pat. No. 5,222,770 discloses a high-pressure hydraulic hose. The multi-layered hose has an inner layer, an intermediate insulation layer, and an outer layer. Between the layers are several conductive layers. The inner, intermediate, and outer layers may be rubber or ebonite.
While ebonite has been used as an alternative to rubber layers in various articles, the presently disclosed invention is directed towards previously unappreciated benefits of ebonite in an article.
SUMMARY OF THE INVENTION
The present invention is directed to a light weight, inexpensive hose and a method of forming such a hose.
The inventive hose is comprised of at least a cover layer, an innermost layer, and at least one intermediate reinforcing layer. The reinforcing layer is formed from an ebonite rubber.
In one aspect of the invention, the ebonite rubber comprising the at least one reinforcing layer has a Shore D hardness in the range of 75 to 100, preferably 90 to 100.
In another aspect of the invention, the ebonite rubber comprising the at least one reinforcing layer has a sulfur content of 10 to 50% by weight.
In another aspect of the invention, the hose is formed with an integral flange formed at at least one end of the hose. The hose is formed with the integral flange being comprised of a central disc of ebonite rubber.
Also disclosed in a method of forming a hose comprising an inner layer, at least one intermediate reinforcing layer, and an outer layer. The method is comprised of forming an inner layer, applying a reinforcing layer of uncured ebonite rubber over the inner layer, and applying a cover layer to form a hose assembly. The hose assembly is cured to form the hose.
In another aspect of the disclosed method of forming a hose, the ebonite rubber is applied until it reaches the thickness required to achieve a desired strength in the cured hose.
In another aspect of the disclosed method of forming a hose, an ebonite disc is applied to at least one end of the hose assembly prior to curing the hose assembly to form an integral flange on the hose.


REFERENCES:
patent: 4365659 (1982-12-01), Yoshida et al.
patent: 4469729 (1984-09-01), Watanabe et al.
patent: 5200258 (1993-04-01), Tamagawa et al.
patent: 5222770 (1993-06-01), Helevirta
patent: 5352507 (1994-10-01), Bresson et al.
patent: 5618869 (1997-04-01), Kadomaru et al.

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