US3700265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal pipe sealing device
Assignee: Nicor Inc
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Filing: 1972-02-04
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Granted: 1972-10-24
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Expires: 1992-02-04
Abstract
Abstract The sealing device is composed of an inner expandable retainer member and an outer elastic sealing member. The inner retainer member in the unexpanded position has a cylindrical sleeve configuration with its end portions in an overlapping arrangement. One of these end portions has two locking grooves to accommodate a range of pipe diameters, which are adapted to receive and hold the other end. The outer elastic member has two annular spaced ridges formed of a deformable hard material which are urged against the pipe''s interior by the inner retainer member to form an air-tight seal with the pipe.
Inventors
- 👤 Raymond J Dufour
- 👤 James J Grimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:03
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
Sealing device for sealing a joint between aligned adjacent pipe ends comprising a resilient tubular outer sealing member of an external diameter less than the internal diameter of the adjacent pipe ends and being adapted to lie inside the pipe ends and to bridge the gap between them, a relatively stiff resilient inner retainer member inserted into the sealing member, said inner retainer member being a tubular sleeve slitted longitudinally and having the margins along the slit overlapping whereby the external diameter of the unexpanded tubular sleeve member is less than the internal diameter of said unexpanded outer sealing member, said inner retainer member having longitudinally extending shoulder means which are brought into interlocking position by expansion of the sleeve against the inside surface of said outer sealing member to hold said outer sealing member under radial pressure against adjacent pipe ends to seal the same, said resilient tubular outer sealing member having sufficient radial displaceability to permit the expansion of said retainer member to the extend of bringing the shoulders into interlocking position and thereafter retaining sufficient compression against the engaged pipe ends to seal the same.
Claim 2
Dependent Claim
188 words
Sealing device for sealing a joint between aligned adjacent pipe ends comprising a resilient tubular outer sealing member of an external diameter less than the internal diameter of the adjacent pipe ends and being adapted to lie inside the pipe ends and to bridge the gap between them, a relatively stiff resilient inner retainer member inserted into the sealing member, said inner retainer member being a tubular sleeve slitted longitudinally and having the margins along the slit overlapping whereby the external diameter of the unexpanded tubular sleeve member is less than the internal diameter of said unexpanded outer sealing member, said inner retainer member having longitudinally extending shoulder means which are brought into interlocking position by expansion of the sleeve against the inside surface of said outer sealing member to hold said outer sealing member under radial pressure against adjacent pipe ends to seal the same, said resilient tubular outer sealing member having sufficient radial displaceability to permit the expansion of said retainer member to the extend of bringing the shoulders into interlocking position and thereafter retaining sufficient compression against the engaged pipe ends to seal the same.
Claim 3
Dependent Claim
40 words
The combination of claim 1, wherein said sealing member has a pair of annular ridges spaced apart in a lengthwise direction a sufficient distance to engage the inside surface of adjoining pipe sections on opposite sides of a pipe joint.
Claim 4
Dependent Claim
24 words
The combination of claim 1, wherein said longitudinally extending shoulder means define at least two locking positions to accommodate different internal pipe diameter sizes.
Claim 5
Dependent Claim
141 words
Apparatus for sealing leaks in pipes comprising a sealing device having an outer sealing member and an inner retainer member, said outer sealing member constructed of elastic material in the form of a band which is stretchable to a sealing engagement position with the inside surface of a pipe, said inner retainer member constructed in the form of a radially expandable split sleeve having overlapping ends and having sufficient rigidity to press said sealing member into sealing engagement with the pipe, and said retainer member including locking means for holding said sealing member into said sealing engagement position, whereby the sealing device is pushed inside the pipe to the leak location and thereafter said retainer member is expanded radially until said sealing member is pressed in sealing engagement with the inside of the pipe which is maintained by said locking means.
Claim 6
Dependent Claim
141 words
Apparatus for sealing leaks in pipes comprising a sealing device having an outer sealing member and an inner retainer member, said outer sealing member constructed of elastic material in the form of a band which is stretchable to a sealing engagement position with the inside surface of a pipe, said inner retainer member constructed in the form of a radially expandable split sleeve having overlapping ends and having sufficient rigidity to press said sealing member into sealing engagement with the pipe, and said retainer member including locking means for holding said sealing member into said sealing engagement position, whereby the sealing device is pushed inside the pipe to the leak location and thereafter said retainer member is expanded radially until said sealing member is pressed in sealing engagement with the inside of the pipe which is maintained by said locking means.
Claim 7
Dependent Claim
39 words
The combination of claim 4, wherein said sealing member has a pair of annular ridges spaced-apart in a lengthwise direction a sufficient distance to engage the inside surface of adjoining pipe sections on opposite sides of a pipe joint.
Claim 8
Dependent Claim
26 words
The combination of claim 4, wherein said locking means of said retainer member has at least two locking positions to accommodate different internal pipe diameter sizes.
Claim 9
Dependent Claim
78 words
The combination of claim 4, wherein said split sleeve of said retainer member has a first end in an overlapping arrangement with a second end in the unexpanded position and said locking means including an overhanging lip portion secured to one of said first and second ends and extending forwardly in a spaced-apart relation with said one of said first and second ends to define therebetween a locking groove for the other of said first and second ends.
References Cited (Backward Citations)
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US2517626A
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US3199598A
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US3586056A
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |