US3575447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube fitting
Assignee: Motors Liquidation Co
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Filing: 1969-03-24
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Granted: 1971-04-20
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Expires: 1989-03-24
Abstract
Abstract A fitting, particularly suited for use with nylon and other polymer tubing for air brake systems and the like, comprises a coupling insert with an externally ridges insert portion extending into the tube and a coupling portion extending from the end of the tube; an internally ridged sleeve tightly enclosing the tube around the insert portion and having one end bearing against a shoulder on the coupling portion; and a nut bearing against the other end of the sleeve and threaded to engage a fitting to which the coupling portion is removably connected. The insert portion is expanded to fix the fitting permanently on the tubing.
Inventors
- 👤 Ralph H Merkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:49
CPC Classifications
F; F16; F16L; F16L33/00; F16L33/20; F16L33/213
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A tube fitting comprising, in combination, an annular coupling member defining a conduit extending from end to end of the member, defining a coupling portion at one end of the member adapted to couple for fluid transmission to a mating fitting, defining an insert portion at the other end of the member adapted to extend into a tube, and defining a shoulder between the said portions facing the said other end; a generally cylindrical sleeve abutting the said shoulder and enclosing the insert portion, the sleeve and insert portion defining between them an annular space closed at one end by the said shoulder to receive the end of the tube, the tube being compressively retained by and between the insert and sleeve within the said space by deformation of at least one of the insert and sleeve to diminish the radial dimension of the said space; and a nut rotatably mounted on the sleeve with a flange engaging the end of the sleeve remote from the said shoulder and extending over the sleeve and at least partially over the coupling portion, the nut being configured to secure the tube fitting to a said mating fitting and press the sleeve against the coupling portion and the coupling portion against the said mating fitting.
Claim 2
Dependent Claim
212 words
A tube fitting comprising, in combination, an annular coupling member defining a conduit extending from end to end of the member, defining a coupling portion at one end of the member adapted to couple for fluid transmission to a mating fitting, defining an insert portion at the other end of the member adapted to extend into a tube, and defining a shoulder between the said portions facing the said other end; a generally cylindrical sleeve abutting the said shoulder and enclosing the insert portion, the sleeve and insert portion defining between them an annular space closed at one end by the said shoulder to receive the end of the tube, the tube being compressively retained by and between the insert and sleeve within the said space by deformation of at least one of the insert and sleeve to diminish the radial dimension of the said space; and a nut rotatably mounted on the sleeve with a flange engaging the end of the sleeve remote from the said shoulder and extending over the sleeve and at least partially over the coupling portion, the nut being configured to secure the tube fitting to a said mating fitting and press the sleeve against the coupling portion and the coupling portion against the said mating fitting.
Claim 3
Dependent Claim
18 words
A fitting as recited in claim 1 in combination with a tube retained between the sleeve and insert.
Claim 4
Dependent Claim
34 words
A combination as recited in claim 2 in which the outer surface of the insert and the inner surface of the sleeve have surface relief engaging the tube to enhance retention of the tube.
Claim 5
Dependent Claim
41 words
A fitting as recited in claim 1 in which the fitting is dimensioned relative to the tube for expansion of the insert portion to an interior diameter substantially equal to the interior diameter of the tube for retention of the tube.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |