US3754474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gripper pad
Assignee: Corod Manufacturing Ltd
•
Filing: 1971-09-01
•
Granted: 1973-08-28
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Expires: 1991-09-01
Abstract
Abstract A gripper pad, for use in a track-type continuous rod service rig, is provided. The pad comprises a deformable elastomer block having a series of aluminum studs embedded in its upper face. The provision of the studs results in higher pressure being applied to the rod, against which the pad is squeezing, than is applied to the block itself by the rig track.
Inventors
- 👤 A Palynchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/22; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1587
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A gripper unit comprising: a gripper pad comprising a deformable elastomer block having a working face, and at least one rigid stud embedded in the block, the outer end of the stud being disposed substantially flush with the working face and its inner end being spaced inwardly from that face of the block which is opposite to the working face; and rigid container means tightly encasing the sides of the block, up to the working face, as well as the end and bottom surfaces of the block.
Claim 2
Dependent Claim
87 words
A gripper unit comprising: a gripper pad comprising a deformable elastomer block having a working face, and at least one rigid stud embedded in the block, the outer end of the stud being disposed substantially flush with the working face and its inner end being spaced inwardly from that face of the block which is opposite to the working face; and rigid container means tightly encasing the sides of the block, up to the working face, as well as the end and bottom surfaces of the block.
Claim 3
Dependent Claim
21 words
The gripper unit as set forth in claim 1 wherein: the elastomer has a hardness greater than about 80 shore A.
Claim 4
Dependent Claim
32 words
The gripper unit as set forth in claim 1 wherein: the elastomer is polyurethane having a hardness within the range 45 - 55 shore D, and the stud is formed of aluminum.
Claim 5
Dependent Claim
33 words
The gripper unit as set forth in claim 2 wherein: the block has a plurality of small, inwardly extending holes formed therein whereby the elastomer may initially be deformed to close the holes.
References Cited (Backward Citations)
US1891723A
Cited
US2775869A
Cited
US2841961A
Cited
US3003609A
Cited
US3305048A
Cited
US3585102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |