US3844587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Releasable connection for coaxial tubes
Assignee: KM Kabelmetal AG
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Filing: 1973-03-19
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Granted: 1974-10-29
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Expires: 1993-03-19
Abstract
Abstract Disclosed is a structure for connecting the ends of a pair of coaxial corrugated tubes to a connecting member by means of a releasable bolt joint wherein an end portion of the inner tube is free from corrugation and sandwiched in between an annulus inside of the inner tube and a flange member that has been threaded into the helical corrugation of the outer tube. The latter flange member has a recess with a sealing ring for sealing against the uncorrugated portion of the inner tube from the outside as well as against the annulus around the axial end piece, or a separate seal is provided between inner tube and annulus.
Inventors
- 👤 S Fuhrmann
- 👤 V Harders
- 👤 H Kruger
- 👤 R Schwenke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:15
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L25/00; F16L25/0036; F16L55/00; F16L59/00; F16L59/14; F16L59/153; F16L59/16; F16L59/18; F16L59/187; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
In a releasable connection between a coaxial tube system having two corrugated, concentric tubes positioned and retained relative to each other by spacer means, and a connecting piece with a central bore to be aligned with the inner one of the two tubes, at least the outer one having helical corrugation, a flange element having a threaded sleeve portion threaded into the corrugation of the outer tube and being bolted to said connecting piece, the improvement comprising: an end portion of the inner tube being flat, without corrugation nor outwardly extending flange but having smooth inner and outer surfaces; an annulus having an outer surface and placed into the inner tube and into abutment with the inner surface of the flat portion thereof; the flange element having a recess facing the outer surface of the flat end of the inner tube in radial inward direction and adjacent but opposite to the location of abutment of the said annulus with the inner tube; a sealing ring in said recess in sealing abutment with a flat tube end, so that upon bolting the connecting piece to the flange element under axially directed tension the flat tube is sandwiched between the flange element with sealing ring and the said annulus while the sealing ring is radially compressed against the flat end of the inner tube; and means to sealingly connect the annulus to the connecting piece.
Claim 2
Dependent Claim
233 words
In a releasable connection between a coaxial tube system having two corrugated, concentric tubes positioned and retained relative to each other by spacer means, and a connecting piece with a central bore to be aligned with the inner one of the two tubes, at least the outer one having helical corrugation, a flange element having a threaded sleeve portion threaded into the corrugation of the outer tube and being bolted to said connecting piece, the improvement comprising: an end portion of the inner tube being flat, without corrugation nor outwardly extending flange but having smooth inner and outer surfaces; an annulus having an outer surface and placed into the inner tube and into abutment with the inner surface of the flat portion thereof; the flange element having a recess facing the outer surface of the flat end of the inner tube in radial inward direction and adjacent but opposite to the location of abutment of the said annulus with the inner tube; a sealing ring in said recess in sealing abutment with a flat tube end, so that upon bolting the connecting piece to the flange element under axially directed tension the flat tube is sandwiched between the flange element with sealing ring and the said annulus while the sealing ring is radially compressed against the flat end of the inner tube; and means to sealingly connect the annulus to the connecting piece.
Claim 3
Dependent Claim
30 words
The combination as in claim 1, wherein the annulus and the connecting piece are integral, the latter constituting an axial extension of the former and inserted into the inner tube.
Claim 4
Dependent Claim
18 words
The combination as in claim 1, wherein at least one surface of the said recess has beveled contour.
Claim 5
Dependent Claim
42 words
The combination as in claim 1, wherein the said outer surface of the annulus is cylindrical, there being a radially outwardly extending surface of the annulus serving as stop for the axial end of tHe inner tube and of the sealing ring.
Claim 6
Dependent Claim
50 words
The combination as in claim 1, wherein the outer surface of the annulus is conical, the flange element having a correspondingly mating, conical inner surface provided with the recess, the tube end being conically flared and sandwiched between the said conical surfaces of the annulus and of the flange element.
Claim 7
Dependent Claim
72 words
The combination as in claim 1, wherein the annulus has a surface portion extending radially away from the said outer surface, the sealing ring engaging the flange element at the recess, the outer flat end of the inner tube and the surface portion; the sealing ring being axially compressed upon bolting of the connecting piece to the flange element to obtain radial pressure of the sealing ring against the flat tube end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |