US4235469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe handling apparatus
Assignee: Den Con Tool Co
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Filing: 1979-05-11
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Granted: 1980-11-25
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Expires: 1999-05-11
Abstract
Abstract An apparatus for insertion into the interior of large diameter pipe or tubing which engages inner portions of the pipe so that the pipe may be lifted and moved. Slip assemblies are wedged into engagement with inner portions of the pipe. The amount of wedging may be varied with a hydraulic cylinder or other suitable power source. Pipe guide members are provided to insure centering of the apparatus within the pipe.
Inventors
- 👤 Lawrence A. Denny
- 👤 James E. Aswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/06; E21B19/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
224 words
An apparatus for engaging the interior of a tubular member for movement and handling thereof, comprising: (a) a plurality of slips for engaging an inner wall of the tubular member; (b) ramp means for urging said plurality of slips outwardly during relative movement therebetween to engage the inner wall of the tubular member; (c) fluid power cylinder means for causing relative movement between said plurality of slips and said ramp means; (d) leveling beam means for transferring movement from said fluid power cylinder means to said plurality of slips to cause substantially uniform engagement between said plurality of slips and the inner wall of the tubular member and balanced loading during movement and handling thereof; (e) guide rod means for guiding movement of said slips and said leveling beam means with respect to the tubular member; (f) an outer body member having: (1) an outer end plate for attachment to said guide rod means; (2) a support plate for mounting said fluid power cylinder means therewith, said support plate having an opening for passage therethrough of said guide rod means; (g) said leveling beam means having an opening for passage of said guide rod means therethrough; and (h) an inner body member having an inner support member for mounting said ramp means therewith, said inner body member having said guide rod means attached thereto.
Claim 2
Independent Claim
224 words
An apparatus for engaging the interior of a tubular member for movement and handling thereof, comprising: (a) a plurality of slips for engaging an inner wall of the tubular member; (b) ramp means for urging said plurality of slips outwardly during relative movement therebetween to engage the inner wall of the tubular member; (c) fluid power cylinder means for causing relative movement between said plurality of slips and said ramp means; (d) leveling beam means for transferring movement from said fluid power cylinder means to said plurality of slips to cause substantially uniform engagement between said plurality of slips and the inner wall of the tubular member and balanced loading during movement and handling thereof; (e) guide rod means for guiding movement of said slips and said leveling beam means with respect to the tubular member; (f) an outer body member having: (1) an outer end plate for attachment to said guide rod means; (2) a support plate for mounting said fluid power cylinder means therewith, said support plate having an opening for passage therethrough of said guide rod means; (g) said leveling beam means having an opening for passage of said guide rod means therethrough; and (h) an inner body member having an inner support member for mounting said ramp means therewith, said inner body member having said guide rod means attached thereto.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1, further including: retainer arm means for connecting said plurality of slips on said ramp means.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1, further including: a centering lip formed on said leveling beam means for centering the apparatus onto the tubular member.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1, wherein: said plurality of slips having gripping dies formed thereon for engaging relatively smooth inner walls of tubular members.
Claim 6
Dependent Claim
23 words
The apparatus of claim 1, wherein: said plurality of slips having smooth gripping surfaces for contact with tubular members having inner contact surfaces.
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |