US3830532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression type tube end connection
Assignee: Eaton Aeroquip LLC
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Filing: 1972-07-07
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Granted: 1974-08-20
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Expires: 1992-07-07
Abstract
Abstract A fluid-tight connection which enables an open tube end to be secured to a fitting in the field without soldering. The connection comprises a body having a bore for receiving the tube end, the bore having wider and narrower portions with a tapered portion therebetween A ferrule and a nut are slipped onto the tube which is inserted in the body bore against a shoulder. The ferrule has a thin-walled forward section which will be deflected inwardly by the tapered bore portion as the nut is tightened, biting into the tube wall to form a primary seal between the ferrule and tube. A sharp edge on the body digs into a tapered surface on the ferrule to form a primary seal between these two parts. A backup seal between the ferrule and tube is formed by a weakened rearward ferrule section forced inwardly by a tapered surface on the nut.
Inventors
- 👤 A Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:08
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/08; F16L19/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
300 words
In a compression type connection between an open tube end and a body having a bore, a tapered portion in said bore, a shoulder in said bore engaged by the tube end, an external thread on said body, a nut on said tube threadably engaging said body, a ferrule on said tube between said nut and body, the nut and ferrule having opposing shoulders whereby nut tightening will force the ferrule into the body bore, a weakened section at the forward end of said ferrule engageable with said tapered portion of the body bore, said last-mentioned portion being more sharply tapered than said weakened section whereby nut tightening will force the outer porton of this weakened section radially inwardly until the forward edge of the ferrule bites into the outer tube surface to form a primary seal between the ferrule and tube, a tapered sealing surface on the ferrule rearwardly of and axially spaced from the entire weakened portion and more sharply tapered than said weakened portion, a sharp edge in the Body bore formed by a radial shoulder at the wider end of said tapered body bore portion and engageable with said tapered ferrule sealing surface upon nut tightening to form a primary seal between the ferrule and body, a weakened rearward section on said ferrule, and a tapered surface on said nut engageable with said last-mentioned ferrule section when the nut is tightened, whereby the outer portion of this section will be deflected inwardly to bite into the outer tube surface only at its rearmost edge and form a backup seal between the ferrule and tube, all portions of said ferrule between said outer portions of the forward and rear weakened sections being of sufficient radial thickness as to be undeflected radially inwardly when the nut is tightened.
Claim 2
Dependent Claim
300 words
In a compression type connection between an open tube end and a body having a bore, a tapered portion in said bore, a shoulder in said bore engaged by the tube end, an external thread on said body, a nut on said tube threadably engaging said body, a ferrule on said tube between said nut and body, the nut and ferrule having opposing shoulders whereby nut tightening will force the ferrule into the body bore, a weakened section at the forward end of said ferrule engageable with said tapered portion of the body bore, said last-mentioned portion being more sharply tapered than said weakened section whereby nut tightening will force the outer porton of this weakened section radially inwardly until the forward edge of the ferrule bites into the outer tube surface to form a primary seal between the ferrule and tube, a tapered sealing surface on the ferrule rearwardly of and axially spaced from the entire weakened portion and more sharply tapered than said weakened portion, a sharp edge in the Body bore formed by a radial shoulder at the wider end of said tapered body bore portion and engageable with said tapered ferrule sealing surface upon nut tightening to form a primary seal between the ferrule and body, a weakened rearward section on said ferrule, and a tapered surface on said nut engageable with said last-mentioned ferrule section when the nut is tightened, whereby the outer portion of this section will be deflected inwardly to bite into the outer tube surface only at its rearmost edge and form a backup seal between the ferrule and tube, all portions of said ferrule between said outer portions of the forward and rear weakened sections being of sufficient radial thickness as to be undeflected radially inwardly when the nut is tightened.
Claim 3
Dependent Claim
35 words
The combination according to claim 1, said rearward weakened ferrule section having a tapered surface facing the tapered nut surface but with a slightly lesser angle of taper than that of the tapered nut surface.
Claim 4
Dependent Claim
51 words
The combination according to claim 1, the forward end surface of said ferrule being slightly raked, whereby said end surface will be substantially at right angles to the tube axis after the forward weakened portion of the ferrule has been deflected inwardly, resisting any separating force between the body and tube.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |