US4921284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength split clamp for pipe flanges
Assignee: FMC Corp
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Filing: 1989-04-28
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Granted: 1990-05-01
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Expires: 2009-04-28
Abstract
Abstract A splitt clamp assembly for pipe flanges, comprising an outer ring with internal threads for securing it to an externally threaded first pipe flange, and a plurality of arcuate segments interconnected by keys into an inner ring, means to secure the inner ring to a second pipe flange, and means to secure the inner and outer rings together in a relative non-rotable manner.
Inventors
- 👤 Shiva P. Singeetham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:13
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/02; F16L23/036; F16L19/00; F16L19/02; F16L19/0231
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A split clamp apparatus for providing a high strength connection between a pair of pipe flanges, said apparatus comprising (a) an outer ring having first and second sets of internal threads; (b) at least two arcuate ring segments which form a split ring when joined together in end-to-end manner, said split ring having a set of external threads engageable with the outer ring second thread set, and means for securing said split ring to a pipe in a pipe flange-surrounding position; (c) means for securing the arcuate ring segments together in end-to-end manner; and (d) means for securing the split ring to the outer ring against relative rotation when said outer ring is threaded onto said split ring into proper flange-clamping position.
Claim 2
Dependent Claim
122 words
A split clamp apparatus for providing a high strength connection between a pair of pipe flanges, said apparatus comprising (a) an outer ring having first and second sets of internal threads; (b) at least two arcuate ring segments which form a split ring when joined together in end-to-end manner, said split ring having a set of external threads engageable with the outer ring second thread set, and means for securing said split ring to a pipe in a pipe flange-surrounding position; (c) means for securing the arcuate ring segments together in end-to-end manner; and (d) means for securing the split ring to the outer ring against relative rotation when said outer ring is threaded onto said split ring into proper flange-clamping position.
Claim 3
Dependent Claim
23 words
A split clamp according to claim 1 wherein the outer ring first thread set functions to secure said ring to a piper flange.
Claim 4
Dependent Claim
37 words
A split clamp according to claim 2 wherein the means for securing the split ring to a pipe comprise an inner radial flange on said split ring for residing in an external annular groove on said pipe.
Claim 5
Dependent Claim
39 words
A split clamp according to claim 1 wherein the means for securing the ring segments together comprise a key for spanning a segment-to-segment juncture, and means for securing said key to each of the two segments at said juncture.
Claim 6
Dependent Claim
37 words
A split clamp according to claim 1 wherein the means for securing the split ring to the outer ring against relative rotation comprises at least one key that is secured to both rings when in functional position.
Claim 7
Dependent Claim
24 words
A split clamp according to claim 5 wherein there are two keys positioned at diametrically opposite functional locations on the ends of both rings.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |