Safety hose

Details Safety hose Safety hose

1998-02-06

2000-01-04

Hook, James F.

Pipes and tubular conduits

Flexible

Distinct layers

138141, 138104, 138DIG1, F16L 1112

Patent

active

060099119

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The invention relates to a safety hose made of elastomeric material and/or plastic, in particular for conveying environmentally harmful substances (e.g. chemicals), comprising an inner layer (1) (core), an outer layer (cover), as well as an embedded rigid carrier in turn comprising two rigid carrier systems, each of which comprises one or a plurality of layers, whereby at least one separating intermediate layer is disposed between the two rigid carrier systems, and whereby the rigid carrier system--in the following referred to as rigid carrier system (I)--facing the inner layer has low extensibility, in particular an elongation at break of <10% as well as high chemical resistance versus the substance to be conveyed, whereas the rigid carrier system--in the following referred to as rigid carrier system (II)--facing the outer layer has high extensibility, in particular an elongation at break of >10%.
A safety hose of this type is known, for example from EP-A-0 567 115, DF-C-44 16 953 and DE-A-44 38 840. The outer layer of the safety hose according to DE-C-44 16 953, with a rigid carrier system (II) with higher chemical resistance as compared to rigid carrier system (I), is perforated, so that the substance can escape to the outside in case of failure of the hose. In the event of breakdown of the hose which is not noticed immediately, this constitutes the greatest hazard for the user under certain circumstances. If caustic, toxic or explosive substances should exit from such a hose system, this may lead to damage of equipment or injury to persons.
According to the current state of the art it is very difficult, furthermore, to develop for the wide spectrum of substances a safety system that is suitable for all substance classifications. For example, a hose has been developed earlier which is capable of indicating a defect before substance can exit from the hose, by equipping rigid carrier system (I) with a conductive material. Should said rigid carrier system get destroyed, the electrical conductor becomes defective as well, so that the interruption of the conductor can be indicated (EP-A-0 567 115; DE-A-44 38 840). However, it is not advisable to operate with such systems in connection with all substances.
Now, against the state of the art outlined above the problem of the invention is to make available a safety hose which, in the event of any failure of the basic body, is substance-tight until the hose is replaced.
According to the invention, said problem is solved by a safety hose with the characterizing features of claim 1 or 2.
According to the one variation, an adhesion system--in the following referred to as adhesion system (III)--is present between rigid carrier system (II) and the outer layer. Said adhesion system is provided with a radially, helically or axially extending two-zone system (A, B), whereby the one zone--in the following referred to as zone (A)--is characterized by a lesser adhesion effect as compared to the other zone--in the following referred to as zone (B)--, whereby in particular the following alternatives are employed with respect to adhesion system (III): piece (i.e., material-locked), whereby the different adhesion effect develops within the two-zone system (A, B) particularly directly (i.e., without an additional layer) on rigid carrier system (II). adhesion system (III) forms its own adhesive layer, whereby the different adhesion effect develops within the two-zone system (A, B) exclusively on the side facing rigid carrier system (II), in particular again directly on the rigid carrier system.
According to the other variation, an adhesion system--in the following referred to as adhesion system (IV)--is present between rigid carrier system (II) and the intermediate layer. Said adhesion system is provided with a radially helically or axially extending two-zone system (A, B) as well, which is characterized by the differences in adhesion specified above, whereby in particular the following alternatives are applied with respect to adhesion system (IV); one piece, w

REFERENCES:
patent: 3604461 (1971-09-01), Matthews
patent: 3893488 (1975-07-01), Rogers et al.
patent: 4643927 (1987-02-01), Luecke et al.
patent: 5474822 (1995-12-01), Rober et al.
patent: 5699835 (1997-12-01), Nakagawa et al.
patent: 5706865 (1998-01-01), Douchet

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