US3668754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of forming pipe joints
Assignee: Individual
•
Filing: 1970-04-22
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Granted: 1972-06-13
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Expires: 1990-04-22
Abstract
Abstract A method of forming a pipe joint, which pipe joint is of the kind in which an external peripheral flange is provided on the pipe and a nut or other retaining device encircles the pipe so as to abut the flange (or a member in engagement therewith), which nut or retaining device can be engaged with a threaded or other suitably shaped part of the fitting to which the pipe is to be joined in such manner that the flange is trapped between the nut or retaining device and part of the fitting. The method comprises forming the flange as an annular element which is expanded by heating and is then shrunk on to the pipe. The inner periphery of the annular element and the outer periphery of the pipe are formed with inter-engaging projections and recesses.
Inventors
- 👤 Derek Walter Boast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/02; F16L19/0206; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49446; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
333 words
A method for forming a leak-proof joint at one end of a plastics pipe, comprising the steps of: a. trimming the end of the pipe to a plane surface perpendicular to the axis thereof; b. cutting an endless, circumferentially extending groove in the external surface of the pipe at a predetermined distance from the end of the pipe; c. placing on the pipe an internally screw threaded nut, the diameter of the screw thread being substantially larger than the external diameter of the pipe and the nut including, at the end remote from the end of the pipe, a collar which is a close fit around the pipe; d. heating a plastics flange element, which element Is ringshaped and has an inner surface of substantially the same diameter as the outside of the pipe and has a ridge formed on said surface and shaped to engage in said groove in the pipe and a plane end face; the flange element being of a smaller outside diameter than the diameter of the screw thread of the nut; e. when the flange element has expanded sufficiently for said ridge to fit over the pipe, placing the flange element on the pipe at the location of the groove with the plane end face adjacent said collar, and shrink-fitting the flange element onto the pipe so that the ridge sealingly engages within the groove without deforming the flange element; f. introducing the end of the pipe into a pipe fitting having an internally tapered, externally screw threaded, cylindrical portion, the said portion being adapted to engage against the face of the flange element remote from said collar and the screw thread being engageable with the nut; g. engaging the nut with the screw threaded portion of the fitting and tightening the nut, whereby the collar of the nut engages and seals against the plane face of the flange element and the fitting engages and seals against the other face of the flange element without deforming the pipe.
Claim 2
Independent Claim
333 words
A method for forming a leak-proof joint at one end of a plastics pipe, comprising the steps of: a. trimming the end of the pipe to a plane surface perpendicular to the axis thereof; b. cutting an endless, circumferentially extending groove in the external surface of the pipe at a predetermined distance from the end of the pipe; c. placing on the pipe an internally screw threaded nut, the diameter of the screw thread being substantially larger than the external diameter of the pipe and the nut including, at the end remote from the end of the pipe, a collar which is a close fit around the pipe; d. heating a plastics flange element, which element Is ringshaped and has an inner surface of substantially the same diameter as the outside of the pipe and has a ridge formed on said surface and shaped to engage in said groove in the pipe and a plane end face; the flange element being of a smaller outside diameter than the diameter of the screw thread of the nut; e. when the flange element has expanded sufficiently for said ridge to fit over the pipe, placing the flange element on the pipe at the location of the groove with the plane end face adjacent said collar, and shrink-fitting the flange element onto the pipe so that the ridge sealingly engages within the groove without deforming the flange element; f. introducing the end of the pipe into a pipe fitting having an internally tapered, externally screw threaded, cylindrical portion, the said portion being adapted to engage against the face of the flange element remote from said collar and the screw thread being engageable with the nut; g. engaging the nut with the screw threaded portion of the fitting and tightening the nut, whereby the collar of the nut engages and seals against the plane face of the flange element and the fitting engages and seals against the other face of the flange element without deforming the pipe.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, in which said heating is effected by immersing said flange element in boiling water.
References Cited (Backward Citations)
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US1186812A
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |