US4149567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-core hydraulic duct
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1978-01-12
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Granted: 1979-04-17
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Expires: 1998-01-12
Abstract
Abstract A multi-core duct is constituted by a plurality of resilient conduits bunched together within a protective sleeve. Each of the conduits is formed from a high-strength synthetic plastics material and the protective sleeve is made of a flame-resistant synthetic plastics material.
Inventors
- 👤 Walter Weirich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:11
CPC Classifications
F; F16; F16L; F16L39/00; F16L39/02; E; E21; E21D; E21D23/00; E21D23/16; E21D23/26; E21F; E21F17/00; E21F17/04; E21F17/08; F16L11/00; F16L11/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A multi-core duct, comprising: a plurality of resilient conduits bunched together, each of the conduits being formed from a high-strength synthetic plastics material, a protective sleeve made of a flame-resistant synthetic plastics material surrounding the bunched conduits, a rigid inner support sleeve and an outer sleeve clamping each end of the protective sleeve, and a frustoconical extension provided on the outer sleeve, the free end of said extension having a flange for the connection of a rotatable coupling piece.
Claim 2
Dependent Claim
79 words
A multi-core duct, comprising: a plurality of resilient conduits bunched together, each of the conduits being formed from a high-strength synthetic plastics material, a protective sleeve made of a flame-resistant synthetic plastics material surrounding the bunched conduits, a rigid inner support sleeve and an outer sleeve clamping each end of the protective sleeve, and a frustoconical extension provided on the outer sleeve, the free end of said extension having a flange for the connection of a rotatable coupling piece.
Claim 3
Dependent Claim
23 words
A multi-core duct according to claim 1, wherein the protective sleeve is made of a synthetic plastics material formed on a rubber base.
Claim 4
Dependent Claim
14 words
A multi-core according to claim 1, wherein the conduits are made of a polyamide.
Claim 5
Dependent Claim
23 words
A multi-core duct according to claim 1, wherein the outer sleeve is provided with indentations which are directed towards the inner support sleeve.
Claim 6
Dependent Claim
23 words
A multi-core duct according to claim 4, wherein the indentations are constituted by corrugations extending in the longitudinal direction of the protective sleeve.
References Cited (Backward Citations)
US1124299A
Cited
US3044256A
Cited
US3425455A
Cited
US3557839A
Cited
US3529632A
Cited
US3590855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |