US3922825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for erecting an oil well derrick
Assignee: NOV Inc
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Filing: 1974-12-30
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Granted: 1975-12-02
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Expires: 1994-12-30
Abstract
Abstract A system for quickly and easily erecting or disassembling an oil well derrick. A stationary base is positioned at the well site. A movable base is connected to the stationary base by a multiplicity of struts. The struts are connected to both the stationary base and the movable base by pin connections that allow the struts to rotate relative to said bases. A reclining oil well derrick mast is coupled to the movable base by a rotatable connection. A force is applied to the movable base causing the struts to pivot on the stationary base and rotate on the movable base and rise to an elevated position.
Inventors
- 👤 Kenneth Harmon Eddy
- 👤 Kenneth Harmon Mcgill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:40
CPC Classifications
E; E21; E21B; E21B15/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A method of erecting an oil well derrick from a reclining position to an upright position, comprising the steps of: positioning a stationary base at a well site, connecting a movable base to said stationary base by means that will allow the movable base to be elevated relative to said stationary base, connecting a reclining derrick mast to the movable base by a rotatable connection, elevating said movable base relative said stationary base, and rotating said mast on the rotatable connection until the mast is in its erect position.
Claim 2
Independent Claim
89 words
A method of erecting an oil well derrick from a reclining position to an upright position, comprising the steps of: positioning a stationary base at a well site, connecting a movable base to said stationary base by means that will allow the movable base to be elevated relative to said stationary base, connecting a reclining derrick mast to the movable base by a rotatable connection, elevating said movable base relative said stationary base, and rotating said mast on the rotatable connection until the mast is in its erect position.
Claim 3
Dependent Claim
48 words
An oil well derrick, comprising: a stationary base, a movable base, a mast, connection means for rotatably connecting said mast to said movable base, and elevating means connecting said movable base to said stationary base for elevating said movable base with said mast connected to said movable base.
Claim 4
Dependent Claim
48 words
An oil well derrick, comprising: a stationary base, a movable base, a mast, connection means for rotatably connecting said mast to said movable base, and elevating means connecting said movable base to said stationary base for elevating said movable base with said mast connected to said movable base.
Claim 5
Dependent Claim
40 words
The oil well derrick of claim 2 wherein said elevating means includes a multiplicity of struts, rotatable means for rotatably connecting said struts between said movable base and said stationary base and force means for causing said struts to rotate.
Claim 6
Dependent Claim
81 words
A mast erection system for an oil well derrick having a reclining mast extending away from the base of the derrick along the ground, comprising: a movable base, a rotatable connection between said movable base and said reclining mast, at least one strut connected to said base of the derrick by a rotatable connection and connected to said movable base by a rotatable connection, and force means for causing said movable base to move relative to said base of the derrick.
Claim 7
Dependent Claim
81 words
A mast erection system for an oil well derrick having a reclining mast extending away from the base of the derrick along the ground, comprising: a movable base, a rotatable connection between said movable base and said reclining mast, at least one strut connected to said base of the derrick by a rotatable connection and connected to said movable base by a rotatable connection, and force means for causing said movable base to move relative to said base of the derrick.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |