US6508277B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible pipe with compressed ends
Assignee: Donaldson Co Inc
•
Filing: 1999-07-27
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Granted: 2003-01-21
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Expires: 2019-07-27
Abstract
Abstract The present disclosure relates to a flexible pipe including a pipe body that extends along a central longitudinal axis. The pipe body is made from a strip that is helically wrapped in a plurality of convolutions. The strip includes inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions. The pipe body includes a mid-portion positioned between first and second end portions. At least the first end portion has an axial length L 1 that traverses at least several of the convolutions of the pipe body. The first end portion is crushed radially inward relative to the mid-portion such that the first end portion has an effective outer diameter D 1 that is smaller than an effective outer diameter D 2 of the mid-portion. A first transition region is positioned between the first end portion and the mid-portion. The first transition region provides a diameter transition between the outer diameter D 1 of the first end portion and the outer diameter D 2 of the mid-portion. The first transition region has an axial length L 2 that traverses at least one of the convolutions of the pipe.
Inventors
- 👤 Julian A. Imes
- 👤 Wayne M. Wagner
- 👤 John T. Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:05
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1805; F01N13/1811; F01N13/1816; F16; F16L; F16L11/00; F16L11/14; F16L11/16
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
239 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) the first end portion having an exposed inner surface such that a pipe can be inserted within the first end portion and clamped directly against the inner surface to provide a lap joint.
Claim 2
Dependent Claim
239 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) the first end portion having an exposed inner surface such that a pipe can be inserted within the first end portion and clamped directly against the inner surface to provide a lap joint.
Claim 3
Dependent Claim
26 words
The flexible pipe of claim 1 , wherein the axial length L 2 of the first transition region traverses no more than 2 of the convolutions.
Claim 4
Dependent Claim
16 words
The flexible pipe of claim 1 , wherein the first transition region has a frusto-conical shape.
Claim 5
Dependent Claim
36 words
The flexible pipe of claim 1 , wherein the mid-portion is axially moveable between an axially expanded orientation and an axially compressed orientation, and the first end portion is permanently retained in an axially compressed orientation.
Claim 6
Dependent Claim
87 words
The flexible pipe of claim 1 , wherein the second end portion has the same outer diameter D 1 and axial length L 1 as the first end portion, wherein a second transition region is portioned between the mid-portion and the second end portion for providing a gradual outer diameter transition between the outer diameter D 2 of the mid-portion and the outer diameter D 1 of the second end portion, the second transition region having the same axial length L 2 as the first transition region.
Claim 7
Dependent Claim
33 words
The flexible pipe of claim 1 , wherein the first end portion is compressed such that interleaves of the interlocked first and second hook portions contact each other in a generally parallel relationship.
Claim 8
Dependent Claim
235 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; and f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body, wherein the pipe body defines a central opening, and wherein the pipe body includes a pipe stop that projects radially into the central opening adjacent to the first transition region.
Claim 9
Dependent Claim
235 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; and f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body, wherein the pipe body defines a central opening, and wherein the pipe body includes a pipe stop that projects radially into the central opening adjacent to the first transition region.
Claim 10
Dependent Claim
18 words
The flexible pipe of claim 1 , further comprising clamps mounted at the first and second end portions.
Claim 11
Dependent Claim
222 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) a compression indicator including a piece of tape secured to the mid-portion of the pipe body.
Claim 12
Dependent Claim
222 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) a compression indicator including a piece of tape secured to the mid-portion of the pipe body.
Claim 13
Dependent Claim
217 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) wherein the first end portion defines a plurality of take-up openings.
Claim 14
Dependent Claim
217 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter D 1 is smaller than the outer diameter D 2 ; f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and g) wherein the first end portion defines a plurality of take-up openings.
Claim 15
Dependent Claim
14 words
The flexible pipe of claim 10 , wherein the take-up openings comprise open-ended slots.
Claim 16
Dependent Claim
236 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having a wall thickness T 1 that is defined along the axial length L 1 ; d) the mid-portion defining a wall thickness T 2 that is larger than the wall thickness T 1 of the first end portion; e) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a -wall thickness transition between the wall thickness T 1 and the wall thickness T 2 , the first transition region having an axial length L 2 that traverses only one or two of the convolutions of the pipe body; f) the interlocked inner and outer hook portions of the first end portion being radially compressed together such that no circumferential slippage is permitted between adjacent convolutions of the first end portion; and g) the first end portion being oriented in a fully axially compressed orientation.
Claim 17
Dependent Claim
236 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having a wall thickness T 1 that is defined along the axial length L 1 ; d) the mid-portion defining a wall thickness T 2 that is larger than the wall thickness T 1 of the first end portion; e) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a -wall thickness transition between the wall thickness T 1 and the wall thickness T 2 , the first transition region having an axial length L 2 that traverses only one or two of the convolutions of the pipe body; f) the interlocked inner and outer hook portions of the first end portion being radially compressed together such that no circumferential slippage is permitted between adjacent convolutions of the first end portion; and g) the first end portion being oriented in a fully axially compressed orientation.
Claim 18
Dependent Claim
205 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter Di is smaller than the outer diameter D 2 ; and f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses between one and two of the convolutions of the pipe body.
Claim 19
Dependent Claim
205 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) at least the first end portion having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first end portion having an outer diameter D 1 that is defined along the axial length L 1 ; d) the mid-portion defining an outer diameter D 2 ; e) the first end portion being crushed radially inward relative to the mid-portion such that the outer diameter Di is smaller than the outer diameter D 2 ; and f) the pipe body including a first transition region positioned between the first end portion and the mid-portion that provides a diameter transition between the outer diameter D 1 and the outer diameter D 2 , the first transition region having an axial length L 2 that traverses between one and two of the convolutions of the pipe body.
Claim 20
Dependent Claim
206 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) the first and second end portions each having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first and second end portions also having a wall thickness T 1 that is defined along the axial lengths L 1 ; d) the mid-portion defining a wall thickness T 2 that is larger than the wall thickness T 1 of the first and second end portions; e) the pipe body including transition regions positioned between the end portions and the mid-portion that provide wall thickness transitions between the wall thicknesses T 1 and the wall thickness T 2 , the transition regions each having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and f) the first and second end portions both having substantially the same inner diameter.
Claim 21
Dependent Claim
206 words
A flexible pipe comprising: a) a pipe body that extends along a central longitudinal axis, the pipe body including a strip that is helically wrapped in a plurality of convolutions, the strip including inner and outer hook portions that interlock to form an interlock seam between adjacent convolutions; b) the pipe body including a mid-portion positioned between first and second end portions; c) the first and second end portions each having an axial length L 1 that traverses at least several of the convolutions of the pipe body, the first and second end portions also having a wall thickness T 1 that is defined along the axial lengths L 1 ; d) the mid-portion defining a wall thickness T 2 that is larger than the wall thickness T 1 of the first and second end portions; e) the pipe body including transition regions positioned between the end portions and the mid-portion that provide wall thickness transitions between the wall thicknesses T 1 and the wall thickness T 2 , the transition regions each having an axial length L 2 that traverses at least one of the convolutions of the pipe body; and f) the first and second end portions both having substantially the same inner diameter.
References Cited (Backward Citations)
US1580760A
Cited
US1596215A
Cited
US1530324A
Cited
US2420153A
Cited
US3085596A
Cited
US3251612A
Cited
US3348629A
Cited
US3508770A
Cited
US3525419A
Cited
US3574358A
Cited
US3572778A
Cited
US3653696A
Cited
US3682203A
Cited
US3645357A
Cited
US3863964A
Cited
US3730293A
Cited
US3827733A
Cited
US3905623A
Cited
US3944265A
Cited
USRE30042E
Cited
US4056273A
Cited
US4142743A
Cited
US4113289A
Cited
DE2734983A1
Cited
US4270689A
Cited
US4261600A
Cited
US4312526A
Cited
US4536019A
Cited
US4466642A
Cited
US4609213A
Cited
US4558891A
Cited
US4623164A
Cited
US4660862A
Cited
US4629226A
Cited
US4813720A
Cited
US4790574A
Cited
EP0289815A1
Cited
US5116083A
Cited
US5310158A
Cited
US5601893A
Cited
US5632513A
Cited
US5588680A
Cited
US5924282A
Cited
US6125889A
Cited
US6123369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-01-20 | 2006-07-22 | 2007-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-01-20 | 2010-07-22 | 2011-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-01-20 | 2014-07-22 | 2015-01-21 | $7700.00 | Window Closed / Lapsed |