US3889354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a crimped tube joint
Assignee: Sintokogio Ltd
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Filing: 1974-02-08
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Granted: 1975-06-17
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Expires: 1994-02-08
Abstract
Abstract A first pipe end is crimped (contracted) over one end of a second pipe inserted telescopically into the first pipe end by two compressing jaws having opposed semi-cylindrical concavities of equal radius of curvature equal to the outer radius of the first pipe end after crimping, whereby a uniform, leakproof contact pressure, due to elastic reaction, is established between the contacting surfaces.
Inventors
- 👤 Sunao Nishi
- 👤 Shojiro Ikeda
- 👤 Asao Kawazoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:07
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/141; B; B21; B21D; B21D39/00; B21D39/04; B29; B29C; B29C65/00; B29C65/56; B29C65/565; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5223; B29C66/52231; B29C66/5224; B29C66/52241; B29C66/5229; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
241 words
A method of forming a leak-proof joint between end parts of first and second pipes by means of a sleeve having opposite ends in which said first and second pipes and sleeve have both elasticity and plasticity, with the inner diameter of the sleeve being approximately equal to the outer diameter of the first and second pipes, comprising the steps of inserting the end part of the first pipe into one end of the sleeve, inserting the end part of the second pipe into the other end of the sleeve, placing a portion of each of the overlapped end parts of the first and second pipes and sleeve between opposed semi-circular concave faces of two diametrically opposed jaw members and having the same radius, the length of the faces being equal to a compressing distance of the overlapped parts extending from the end edge of the sleeve but short of the telescoped pipe end, the radius being equal to the desired outer radius of each overlapped portion of the sleeve after crimping, and then applying a crimping force to both jaw members from diametrically opposite sides in a direction perpendicular to the axial direction of the pipes to plastically deform the sleeve and pipe inwardly at each overlapped portion respectively, said inwardly deformed portion extending from the end edge of the sleeve to a location short of the telescoped pipe end, thereby causing uniform contact pressure between the surfaces thus contacted.
Claim 2
Independent Claim
241 words
A method of forming a leak-proof joint between end parts of first and second pipes by means of a sleeve having opposite ends in which said first and second pipes and sleeve have both elasticity and plasticity, with the inner diameter of the sleeve being approximately equal to the outer diameter of the first and second pipes, comprising the steps of inserting the end part of the first pipe into one end of the sleeve, inserting the end part of the second pipe into the other end of the sleeve, placing a portion of each of the overlapped end parts of the first and second pipes and sleeve between opposed semi-circular concave faces of two diametrically opposed jaw members and having the same radius, the length of the faces being equal to a compressing distance of the overlapped parts extending from the end edge of the sleeve but short of the telescoped pipe end, the radius being equal to the desired outer radius of each overlapped portion of the sleeve after crimping, and then applying a crimping force to both jaw members from diametrically opposite sides in a direction perpendicular to the axial direction of the pipes to plastically deform the sleeve and pipe inwardly at each overlapped portion respectively, said inwardly deformed portion extending from the end edge of the sleeve to a location short of the telescoped pipe end, thereby causing uniform contact pressure between the surfaces thus contacted.
Claim 3
Dependent Claim
41 words
The method of forming a leak-proof joint as claimed in claim 1, in which a curved pipe is used as the sleeve when the first pipe is to be jointed with the second pipe which is perpendicular to said first pipe.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |