US3666296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion joints for rigid metallic pipes
Assignee: Pirelli and C SpA
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Filing: 1970-03-11
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Granted: 1972-05-30
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Expires: 1990-03-11
Abstract
Abstract The disclosure relates to an expansion joint for metallic pipes, the joint comprising a reinforced rubber body in the form of an annular loop having enlarged lateral edge portions and a pair of locking members for connecting the edge portions of the body to adjacent portions of the pipe ends. Each ring is provided with an undercut groove to receive a portion of the enlarged lateral edge portion. Each locking ring comprises a pair of annular elements disposed in facing contact and interlocked. The first annular element has a greater thickness and is directed towards the outer side of the rubber body. The second element extends outwardly beyond the innermost edge of the first element to thus form the undercut groove.
Inventors
- 👤 Pasquale Fischetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/02; F16L27/00; F16L27/10; F16L27/107; F16L27/108; F16L27/1085; F16L51/00; F16L51/02; F16L51/022; F16L51/024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A flexible expansion joint for inter-connecting two pipes, comprising: an annular shaped body of reinforced rubber having opposite axial ends and a central portion which in axial crosssection protrudes radially convexly from said ends, said ends each including an annular radially outwardly projecting collar portion, a pair of metallic locking rings, for each of said ends, each pair of rings defining an annular groove open at the outer axial end thereof, each of said collar portions being lockingly engaged in a respect one of said grooves, the rings of each of said pair being axially adjacent and secured to each other and in facing contact with each other, aid groove being formed between respective radially spaced apart walls of said rings.
Claim 2
Dependent Claim
121 words
A flexible expansion joint for inter-connecting two pipes, comprising: an annular shaped body of reinforced rubber having opposite axial ends and a central portion which in axial crosssection protrudes radially convexly from said ends, said ends each including an annular radially outwardly projecting collar portion, a pair of metallic locking rings, for each of said ends, each pair of rings defining an annular groove open at the outer axial end thereof, each of said collar portions being lockingly engaged in a respect one of said grooves, the rings of each of said pair being axially adjacent and secured to each other and in facing contact with each other, aid groove being formed between respective radially spaced apart walls of said rings.
Claim 3
Dependent Claim
44 words
The joint of claim 1, a first of said rings having a conical radially outer wall, the second of said rings having an outer edge portion bent over said conical wall whereby said rings are lockingly engaged against axial movement relative to each other.
Claim 4
Dependent Claim
61 words
The joint of claim 2, wherein said body includes tubular portions of constant diameter extending from said central portion to said ends, each of said second rings comprising an extent which is bent axially outwardly to define a wall of said groove and is then bent axially inwardly to define a cylinder circumscribing the entire outer surface of said tubular portions.
Claim 5
Dependent Claim
27 words
The joint of claim 3, the axially innermost end of said cylinder being bent axially outwardly to face away from said central convex portion of said body.
Claim 6
Dependent Claim
35 words
A joint as in claim 3, characterized in that the rubber body is provided, as a reinforcing structure, with layers of fabric reinforcing fibers, which extend from one end of the body to the other.
Claim 7
Dependent Claim
59 words
A joint as in claim 3, characterized in that the bent innermost end of the cylindrical prolongation of the second element of a locking ring, and the corresponding edge of the second element of the other locking ring are connected to an intermediate connection element, which passes over the loop of the rubber body to act as a limiter.
Claim 8
Dependent Claim
69 words
A joint as in claim 6, characterized in that said angular connection element is provided with terminal rings and a lacing element, which passes through holes formed in said terminal rings which, on their turn, have in cross section a shape complementary to that of the corresponding bent free edge of the cylindrical prolongation of the second element of the locking ring on which each terminal ring is secured.
Claim 9
Dependent Claim
27 words
A joint as in claim 7, characterized in that a net, made of wire or of a like material, is used in place of said lacing element.
Claim 10
Dependent Claim
27 words
A joint as in claim 6, characterized in that a protective material, is interposed between the annular intermediate connecting element and the loop of the rubber body.
Claim 11
Dependent Claim
22 words
A joint as in claim 9, characterized in that said protective material extends below the cylindrical lateral prolongations of the locking rings.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |