US3652138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking snap-on collar for oil well operations
Assignee: Individual
•
Filing: 1970-04-23
•
Granted: 1972-03-28
•
Expires: 1990-04-23
Abstract
Abstract A thrust or stop-collar principally adapted for use on oil well drill pipes, sucker rods, guides, and similar equipment, combines a base of elastomeric or similar material with a novel spring insert. Configuration of the collar plus the effect of the specially constructed insert combine to give a very great bond between the shaft and the collar while permitting ready and economical installation and removal. An alternate embodiment provides a removable gripping ring inserted concentrically around the inner surface of the collar and disposed by geometry and construction to exert additional bond between the shaft and collar as further insurance against slipping while retaining the ease of installation and removal.
Inventors
- 👤 Charles H Collett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:37
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
210 words
In a split collar of generally cylindrical configuration for oil well drilling equipment and having a body of elastomeric material, the improvement comprising: a spring member of generally cylindrical configuration embedded concentrically in said body; a slot through said body and said spring member positioned near the first end of said collar; that portion of said body external to said spring member terminating at a point adjacent to said slot thereby forming an exposed outer surface of said spring member from said slot to said first end of said collar; a tongue positioned on the second end of said spring member in alignment with said slot, forming an acute angle with the tangent to said spring member, protruding inwardly through said body and disposed to bear against said exposed outer surface of said spring member; means associated with said spring member for tightening said collar around a cylindrical shaft and simultaneously causing said tongue to ride against said exposed outer surface until said tongue springs into said slot; whereby said collar is held in a tightly fixed position around and against said shaft; said means for tightening being further characterized by effecting the engagement between said tongue and said slot through movement of said tongue in a single circular plane.
Claim 2
Dependent Claim
210 words
In a split collar of generally cylindrical configuration for oil well drilling equipment and having a body of elastomeric material, the improvement comprising: a spring member of generally cylindrical configuration embedded concentrically in said body; a slot through said body and said spring member positioned near the first end of said collar; that portion of said body external to said spring member terminating at a point adjacent to said slot thereby forming an exposed outer surface of said spring member from said slot to said first end of said collar; a tongue positioned on the second end of said spring member in alignment with said slot, forming an acute angle with the tangent to said spring member, protruding inwardly through said body and disposed to bear against said exposed outer surface of said spring member; means associated with said spring member for tightening said collar around a cylindrical shaft and simultaneously causing said tongue to ride against said exposed outer surface until said tongue springs into said slot; whereby said collar is held in a tightly fixed position around and against said shaft; said means for tightening being further characterized by effecting the engagement between said tongue and said slot through movement of said tongue in a single circular plane.
Claim 3
Dependent Claim
208 words
A split collar of generally cylindrical configuration for use with oil well drilling equipment and employing a spring member imbedded in a body of elastomeric material, said collar being characterized by: means for tightening said collar around a cylindrical shaft; positive tongue and slot means for engaging said collar around said shaft in a tightened position; engaging means positioned on the inner surface of said collar, said engaging means being disposed for contact against said shaft to prevent axial movement of said collar relative to said shaft; said spring member in said collar having an area positioned on its outer cylindrical surface adjacent to anD in cooperative relation with said slot and said tongue; whereby the engagement of said collar around said shaft may be effected by movement of said tightening means in a circular direction only; said spring member in said collar having an exposed area on its outer cylindrical surface encompassing said slot; said tongue means being disposed for riding against said exposed area while under the action of said tightening means; whereby the engagement between said tongue and said slot means and said collar around said shaft is effected by movement of said tongue means relative to said slot means in a circular direction only.
Claim 4
Dependent Claim
208 words
A split collar of generally cylindrical configuration for use with oil well drilling equipment and employing a spring member imbedded in a body of elastomeric material, said collar being characterized by: means for tightening said collar around a cylindrical shaft; positive tongue and slot means for engaging said collar around said shaft in a tightened position; engaging means positioned on the inner surface of said collar, said engaging means being disposed for contact against said shaft to prevent axial movement of said collar relative to said shaft; said spring member in said collar having an area positioned on its outer cylindrical surface adjacent to anD in cooperative relation with said slot and said tongue; whereby the engagement of said collar around said shaft may be effected by movement of said tightening means in a circular direction only; said spring member in said collar having an exposed area on its outer cylindrical surface encompassing said slot; said tongue means being disposed for riding against said exposed area while under the action of said tightening means; whereby the engagement between said tongue and said slot means and said collar around said shaft is effected by movement of said tongue means relative to said slot means in a circular direction only.
Claim 5
Dependent Claim
126 words
A split collar of generally cylindrical configuration for oil well drilling equipment comprising: a body of elastomeric material; a spring member in cooperative relation with said body; axial grooves on the inside surface of said collar defining a plurality of parallel contact surfaces; a plurality of holes through said spring member and around the circumferences thereof; a slot positioned near the first end of said split collar; a tongue positioned near the opposite end of said split collar and in alignment with said slot; means associated with said spring member for tightening said collar around said shaft and causing said tongue to be inserted in said slot; a circular groove around the inner surface of said collar; a removable ring adapted for insertion in said grooves.
Claim 6
Dependent Claim
126 words
A split collar of generally cylindrical configuration for oil well drilling equipment comprising: a body of elastomeric material; a spring member in cooperative relation with said body; axial grooves on the inside surface of said collar defining a plurality of parallel contact surfaces; a plurality of holes through said spring member and around the circumferences thereof; a slot positioned near the first end of said split collar; a tongue positioned near the opposite end of said split collar and in alignment with said slot; means associated with said spring member for tightening said collar around said shaft and causing said tongue to be inserted in said slot; a circular groove around the inner surface of said collar; a removable ring adapted for insertion in said grooves.
Claim 7
Dependent Claim
22 words
The collar of claim 3 in which said removable ring comprises the combination of a springy material and an elastomeric outer covering.
Claim 8
Dependent Claim
65 words
The device of claim 1 in which cooperating opposed ends of said spring member adjacent to said slot and to said tongue comprise overlapping cylindrical surfaces; said ends of said surfaces being exposed on their axial edges; whereby the disengagement between said slot and said tongue may be readily effected by insertion of disengaging means between said overlapping cylindrical surfaces in an axial direction only.
Claim 9
Dependent Claim
30 words
The device of claim 1 in which said acute angle formed between said tongue and spring member comprises in addition a circular arc between said tongue and said spring member.
Claim 10
Dependent Claim
58 words
The device of claim 1 in which said means for tightening said collar comprises a pair of oppositely spaced holes one of said holes being positioned adjacent said slot and the other positioned adjacent said tongue said holes being suitably reinforced to prevent rupture of said spring member while being subject to the action of said tightening means.
References Cited (Backward Citations)
US1201706A
Cited
US1976797A
Cited
US2259023A
Cited
US2657956A
Cited
US2846016A
Cited
US2959453A
Cited
US3051532A
Cited
US3197262A
Cited
US3227498A
Cited
US3343890A
Cited
US3425757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |