Patent US5012842A successfully refreshed from Google Patents.
US5012842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid actuated pipe clamp tightener
Assignee: Interprovincial Pipe Line Co
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Filing: 1990-09-13
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Granted: 1991-05-07
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Expires: 2010-09-13
Abstract
Abstract The tightener comprises a scissor clamp having first and second arms pivotally connected at their upper ends. At their lower ends, the arms are pivotally connected with the ends of a loop of chain that encircles a pair of semi-circular steel shells encircling a pipeline. The rod of a cylinder is pivotally connected to move the front arm toward the rear arm. The cylinder is positioned to operate generally perpendicularly relative to the arms.
Inventors
- 👤 Donald D. Savard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:36
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/17; Y; Y10; Y10T; Y10T24/00; Y10T24/21; Y10T24/2177
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
In combination: a pipeline; a pair of semi-circular shells mounted about the pipeline; and a tightener for clamping the shells against the pipeline, said tightener comprising a scissor clamp having a pair of arms pivotally connected at their first ends, a loop of chain extending around the shells, the ends of the loop being pivotally connected with the second ends of the arms, whereby the arms may pull on the loop ends to tighten the loop about the shells, a fluid-actuated cylinder, pivotally connected with the first arm between its ends, for biasing the first arm toward or away from the second arm, said cylinder being arranged generally perpendicularly to the arms and being spaced out of contact with the chain, said second arm abutting and being supported by the front end of the cylinder.
Claim 2
Dependent Claim
135 words
In combination: a pipeline; a pair of semi-circular shells mounted about the pipeline; and a tightener for clamping the shells against the pipeline, said tightener comprising a scissor clamp having a pair of arms pivotally connected at their first ends, a loop of chain extending around the shells, the ends of the loop being pivotally connected with the second ends of the arms, whereby the arms may pull on the loop ends to tighten the loop about the shells, a fluid-actuated cylinder, pivotally connected with the first arm between its ends, for biasing the first arm toward or away from the second arm, said cylinder being arranged generally perpendicularly to the arms and being spaced out of contact with the chain, said second arm abutting and being supported by the front end of the cylinder.
Claim 3
Dependent Claim
56 words
The combination as set forth in claim 1 wherein: the cylinder carries a support plate at its front end, the rear surface of the second arm abuts the front surface of the support plate, and the abutting portions of the second arm rear surface and the front surface of the support plate have mating curved surfaces.
References Cited (Backward Citations)
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US2586057A
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US4057082A
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US4535822A
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |