US3856337A
Expired / Lapsed
US
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Pipe coupling
Assignee: Vodafone GmbH
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Filing: 1972-07-06
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Granted: 1974-12-24
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Expires: 1992-07-06
Abstract
Abstract A pipe coupling structure as between a first and a second pipe with tapered external and internal threading, respectively, with an unthreaded end portion of the externally threaded pipe having an annular, radially outwardly directed convexity of particular diameter of the crest; the second pipe has an unthreaded portion beyond its internal thread and in axial direction into the pipe with an annular, radially inwardly directed convexity and a crest diameter slightly larger than said particular diameter.
Inventors
- 👤 K Ehm
- 👤 P Schatton
- 👤 J Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:52
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/001; F16L15/004; F16L15/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
In a pipe coupling structure as between first and second pipes with tapered external and internal threading, respectively, of the first and second pipe to be threadedly interconnected upon threading the first pipe into the said second pipe in a particular axial direction, each pipe having an axis, the improvement comprising, an unthreaded end portion of the first pipe with the external threading, having an annular, radially outwardly directed first convexity, having a first crest, the first crest having particular diameter relative to the axis of the first pipe, and in a plane transverse thereto, the outer diameter of the unthreaded portion of the first pipe gradually decreasing from the first crest in the axial direction of insertion of the first pipe, the second pipe having internally an unthreaded portion, beyond the internal thread and in axial direction into the pipe; the unthreaded portion of the second pipe having an annular, radially inwardly directed second convexity having a second crest of a diameter, relative to the axis of the second pipe slightly smaller than said particular diameter of the first crest, the inner diameter of the unthreaded portion of the second pipe gradually decreasing towards the second crest in the axial direction of insertion of the second pipe, the first and second convexities sealingly engage upon threaded insertion of the first pipe in the second pipe.
Claim 2
Dependent Claim
226 words
In a pipe coupling structure as between first and second pipes with tapered external and internal threading, respectively, of the first and second pipe to be threadedly interconnected upon threading the first pipe into the said second pipe in a particular axial direction, each pipe having an axis, the improvement comprising, an unthreaded end portion of the first pipe with the external threading, having an annular, radially outwardly directed first convexity, having a first crest, the first crest having particular diameter relative to the axis of the first pipe, and in a plane transverse thereto, the outer diameter of the unthreaded portion of the first pipe gradually decreasing from the first crest in the axial direction of insertion of the first pipe, the second pipe having internally an unthreaded portion, beyond the internal thread and in axial direction into the pipe; the unthreaded portion of the second pipe having an annular, radially inwardly directed second convexity having a second crest of a diameter, relative to the axis of the second pipe slightly smaller than said particular diameter of the first crest, the inner diameter of the unthreaded portion of the second pipe gradually decreasing towards the second crest in the axial direction of insertion of the second pipe, the first and second convexities sealingly engage upon threaded insertion of the first pipe in the second pipe.
Claim 3
Dependent Claim
49 words
In a pipe coupling structure as in claim 1, wherein the first pipe has a frusto-conical end face, and wherein the second pipe has a matching internal frusto-conical shoulder for abutment with the frusto-conical end face of the first pipe upon threading the first pipe into the second pipe.
Claim 4
Dependent Claim
60 words
In a pipe coupling structure as in claim 1, wherein the said convexities have relative axial position, so that the convexity of the first pipe, when inserted in the second pipe, is farther from the threaded end of the second pipe than the convexity of the second pipe, so that the said portions of decreasing diameter sealingly engage each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |