Patent US3744749A successfully refreshed from Google Patents.
US3744749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowout preventer with ram support and guide means
Assignee: Hydril LLC
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Filing: 1971-05-18
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Granted: 1973-07-10
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Expires: 1991-05-18
Abstract
Abstract A blowout preventer having new and improved means for supporting and guiding each ram in its travel to and from the open and closed positions whereby more uniform support, anti-cocking, and anti-heeling of the ram during such travel are accomplished.
Inventors
- 👤 Rouax R Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:48
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
270 words
A blowout preventer, comprising: a blowout preventer body having a longitudinally extending opening through which a well pipe is adapted to extend and also having a laterally extending ram opening in communication with said longitudinally extending opening and having a lower wall; a blowout preventer head mounted adjacent to said body and having a ram cavity in alignment with said ram opening in said body; a blowout preventer ram disposed for movement in said ram opening and said ram cavity to and from a closed position wherein the ram extends into said longitudinally extending opening to assist in closing flow therethrough and to and from an open position wherein the ram is retracted from said longitudinally extending opening; means with said ram for effecting the ram movements to and from said closed and open positions; ram support means with said head and extending into said ram opening of said body for supporting said ram as said ram travels to and from its open and closed positions; ram rail engaging surface on the lower surface of said ram engageable with said ram support means; said ram rail engaging surface being formed at the inner end of said ram and terminating inwardly of the inner end of said ram support means when said ram is in the closed position; said ram having a ram recess in longitudinal alignment with said ram rail engaging surface for receiving said ram support means when said ram is in the closed position; and said ram having a lower surface engageable with said lower wall of said ram opening when said ram is in the closed position.
Claim 2
Dependent Claim
270 words
A blowout preventer, comprising: a blowout preventer body having a longitudinally extending opening through which a well pipe is adapted to extend and also having a laterally extending ram opening in communication with said longitudinally extending opening and having a lower wall; a blowout preventer head mounted adjacent to said body and having a ram cavity in alignment with said ram opening in said body; a blowout preventer ram disposed for movement in said ram opening and said ram cavity to and from a closed position wherein the ram extends into said longitudinally extending opening to assist in closing flow therethrough and to and from an open position wherein the ram is retracted from said longitudinally extending opening; means with said ram for effecting the ram movements to and from said closed and open positions; ram support means with said head and extending into said ram opening of said body for supporting said ram as said ram travels to and from its open and closed positions; ram rail engaging surface on the lower surface of said ram engageable with said ram support means; said ram rail engaging surface being formed at the inner end of said ram and terminating inwardly of the inner end of said ram support means when said ram is in the closed position; said ram having a ram recess in longitudinal alignment with said ram rail engaging surface for receiving said ram support means when said ram is in the closed position; and said ram having a lower surface engageable with said lower wall of said ram opening when said ram is in the closed position.
Claim 3
Dependent Claim
23 words
The structure set forth in claim 1, including: guide means co-acting with said ram for preventing misalignment of said ram during said travel.
Claim 4
Dependent Claim
32 words
The structure set forth in claim 1, wherein said ram support means includes: a pair of laterally spaced longitudinally extending support rails disposed in said head and extending into said ram opening.
Claim 5
Dependent Claim
34 words
The structure set forth in claim 3, including: co-acting guide surfaces on said rails and on said ram for preventing said rams from rolling and yawing during travel of said ram on said rails.
Claim 6
Dependent Claim
62 words
The structure set forth in claim 3, wherein: said ram has a pair of said ram rail engaging surfaces, each engageable with one of said rails upon a predetermined amount of travel of said ram outwardly from its closed position to lift said ram upwardly so that the ram is supported solely by said rails upon continued outward movement of the ram.
Claim 7
Dependent Claim
53 words
The structure set forth in claim 5, wherein: said ram has a pair of said ram recesses, each being aligned with one of said ram rail engaging surfaces and disposed outwardly of each of said rail engaging surfaces, which recesses are disposed over said rails when said ram is in said closed position.
Claim 8
Dependent Claim
27 words
The structure set forth in claim 1, including: means for preventing pitching of said ram when pressure or forces act on the ram in the closed position.
Claim 9
Dependent Claim
79 words
The structure set forth in claim 1, wherein: the wall of said ram opening has an upper curved section and a lower curved section; and the curvature of the external surface of said ram and said curved sections are substantially the same so that regardless of the direction of any pressure or force acting on said ram, the external surface of said ram will be coincidental with one of said curved sections to thereby prevent pitching of said ram.
Claim 10
Dependent Claim
47 words
The structure set forth in claim 8, wherein: said curved sections are vertically spaced from each other to permit vertical movement of said ram in said ram opening while still effecting said coincidental engagement of said external surface of the ram with each of said curved sections.
Claim 11
Dependent Claim
52 words
The structure set forth in claim 9, wherein: said ram rail engaging surfaces each also provides ram-lifting means with said ram support means for lifting said ram a distance approximately equal to said vertical distance between said curved sections as said ram travels outwardly from the closed position towards the open position.
Claim 12
Dependent Claim
52 words
The structure set forth in claim 1, including: seal means on said ram engageable with the wall of said ram opening for sealing therewith when said ram is in said closed position; and wiper means for wiping off the wall of said ram opening as said ram travels to its closed position.
References Cited (Backward Citations)
US1819875A
Cited
US1960592A
Cited
US2146470A
Cited
US2749078A
Cited
US2942616A
Cited
US2934148A
Cited
US3642290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |