US4019539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow flexible tubular body, process and apparatus for making the same
Assignee: TREFILERIES ET CABLERIES CHIERS-CHATILLON-GORCY Ste
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Filing: 1975-06-09
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Granted: 1977-04-26
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Expires: 1995-06-09
Abstract
Abstract A hollow flexible tubular body which comprises at least one tubular layer. The layer is formed by adjacent helical windings having hooked edges and substantially flat sections. The turns of the helix do not show any spontaneous tendency to increase in diameter.
Inventors
- 👤 Daniel Hoffmann
- 👤 Remi Reynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:17
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/24; F16L58/00; F16L58/02; F16L58/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A flexible tubular body comprising a plurality of superposed tubular layers, each formed from a plurality of elongated strips of resilient metal having two substantially parallel edges and helically wound about a hollow flexible tube to form a layer, each strip having its parallel edges hooked in opposite directions, with the edges of adjacent helically wound strips overlapping and so engaged as to permit limited relative sliding axially of said body, and each strip having been prestressed by twisting it helically until permanently deformed before being wound about said flexible tube, the strips in the innermost of each two adjacent layers being deformed to form helics having an inner diameter approximating the outer diameter of the said flexible tube, and the strips of the outermost layer being deformed to form helics having an inner diameter smaller than the outer diameter of said innermost layer, so as to exert compressive force on said innermost layer.
Claim 2
Dependent Claim
154 words
A flexible tubular body comprising a plurality of superposed tubular layers, each formed from a plurality of elongated strips of resilient metal having two substantially parallel edges and helically wound about a hollow flexible tube to form a layer, each strip having its parallel edges hooked in opposite directions, with the edges of adjacent helically wound strips overlapping and so engaged as to permit limited relative sliding axially of said body, and each strip having been prestressed by twisting it helically until permanently deformed before being wound about said flexible tube, the strips in the innermost of each two adjacent layers being deformed to form helics having an inner diameter approximating the outer diameter of the said flexible tube, and the strips of the outermost layer being deformed to form helics having an inner diameter smaller than the outer diameter of said innermost layer, so as to exert compressive force on said innermost layer.
Claim 3
Dependent Claim
26 words
A flexible tubular body as claimed in claim 1 in which the turns of each tubular layer are biassed against each other by their own elasticity.
Claim 4
Dependent Claim
33 words
A flexible tubular body as claimed in claim 1 in which the edge of each strip which is the radially outermost of two overlapping edges is longer than the edge which is innermost.
Claim 5
Dependent Claim
18 words
Flexible tubular body as claimed in claim 1 in which the superposed layers are wound in opposite directions.
Claim 6
Dependent Claim
21 words
A flexible tubular body as claimed in claim 1 in which said tubular layer is wound about a hollow flexible tube.
References Cited (Backward Citations)
US1763360A
Cited
US2168067A
Cited
US2731040A
Cited
US3189052A
Cited
US3500869A
Cited
US3707170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |