Patent US3739849A successfully refreshed from Google Patents.
US3739849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gripping member for well tool
Assignee: Dresser Industries Inc
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Filing: 1971-02-01
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Granted: 1973-06-19
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Expires: 1991-02-01
Abstract
Abstract A slip or gripping member that is used on well tools to lock the well tools at a desired location in a well bore. The slip is movably mounted on the well tool and is provided with wall engaging teeth on relatively opposite sides thereof adjacent to each end. The wall engaging teeth are separated on the slip by a distance that is greater than the diameter of the well bore so that movement of the slip to an angular position brings the teeth into engagement with the well bore wall. Relatively movable abutments are provided on the well tool which are brought into engagement with at least one end of the slip to cause the slip to move into the position wherein the teeth are in engagement with the well bore wall. The slip is constructed so that when the teeth are out of engagement with the well bore wall, the tool with the slips thereon is freely movable through the well bore. The slip is useful in connection with well tools such as packers or anchors and may be actuated by fluid pressure or by mechanical means. The slip teeth are curved and adjacent teeth have different radii of curvature, resulting in a curved bounding profile in a plane containing the central longitudinal axis of the slip.
Inventors
- 👤 R Meripol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:57
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/01; E21B33/00; E21B33/10; E21B33/12; E21B33/129
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
An improved gripping slip arranged to be movably mounted on a well tool and arranged to engage the well bore wall to hold the well tool in a well bore or the like, said slip comprising a unitary body member having first and second ends; a bore, having a longitudinal central axis, extending through said body intersecting said ends and sized to encircle a portion of the well tool; a wall engaging portion adjacent each said end located on generally opposite sides of said body member, the distance between said wall engaging portions being greater than the diameter of the well bore whereby said engaging portions can engage the well bore wall; and, a portion intermediate said ends having a dimension less than the diameter of the well bore, whereby the well tool can move through the well bore, said improvement comprising: each said wall engaging portion having a first curved bounding profile in a plane containing said central axis and a second curved bounding profile about said central axis.
Claim 2
Dependent Claim
170 words
An improved gripping slip arranged to be movably mounted on a well tool and arranged to engage the well bore wall to hold the well tool in a well bore or the like, said slip comprising a unitary body member having first and second ends; a bore, having a longitudinal central axis, extending through said body intersecting said ends and sized to encircle a portion of the well tool; a wall engaging portion adjacent each said end located on generally opposite sides of said body member, the distance between said wall engaging portions being greater than the diameter of the well bore whereby said engaging portions can engage the well bore wall; and, a portion intermediate said ends having a dimension less than the diameter of the well bore, whereby the well tool can move through the well bore, said improvement comprising: each said wall engaging portion having a first curved bounding profile in a plane containing said central axis and a second curved bounding profile about said central axis.
Claim 3
Dependent Claim
22 words
The gripping slip of claim 1 wherein at least one of said wall engaging portions has a plurality of teeth formed thereon.
Claim 4
Dependent Claim
16 words
The gripping slip of claim 2 wherein said bounding curve is a segment of a circle.
Claim 5
Dependent Claim
16 words
The gripping slip of claim 2 wherein said bounding curve is a segment of a parabola.
Claim 6
Dependent Claim
20 words
The gripping slip of claim 1 wherein both of said wall engaging portions have a plurality of teeth formed thereon.
Claim 7
Dependent Claim
111 words
An improved gripping slip for well tools comprising: a tubular body having a longitudinal axis, first and second ends, a pivot axis located midway between said ends and extending generally perpendicularly to and intersecting said longitudinal axis, and a wall engaging surface adjacent each said end, at least one of said wall engaging surfaces being an arcuate surface, wherein said at least one arcuate surface comprises teeth and the radius of curvature of each said tooth is different from the radius of curvature of an adjacent tooth; and a pair of lug members projecting into the interior of said tubular body member, said lug members being located on said pivot axis.
Claim 8
Dependent Claim
111 words
An improved gripping slip for well tools comprising: a tubular body having a longitudinal axis, first and second ends, a pivot axis located midway between said ends and extending generally perpendicularly to and intersecting said longitudinal axis, and a wall engaging surface adjacent each said end, at least one of said wall engaging surfaces being an arcuate surface, wherein said at least one arcuate surface comprises teeth and the radius of curvature of each said tooth is different from the radius of curvature of an adjacent tooth; and a pair of lug members projecting into the interior of said tubular body member, said lug members being located on said pivot axis.
References Cited (Backward Citations)
US2638851A
Cited
US3548936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |