US5060740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw thread coupling
Assignee: Sandvik Rock Tools Inc
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Filing: 1990-05-29
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Granted: 1991-10-29
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Expires: 2010-05-29
Abstract
Abstract A thread coupling comprises two interconnected screw threads. Each of the screw threads has a root portion shaped as a portion of an ellipse. With respect to one of the threads having such a shape, the major axis of the ellipse is longer than that of the other thread.
Inventors
- 👤 Faisal J. Yousef
- 👤 Robert F. Kane
- 👤 Joel Ham
- 👤 David Mildren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:41
CPC Classifications
F; F16; F16B; F16B33/00; F16B33/02; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
237 words
In combination, a threaded element and a threaded mating member adapted to be coaxially threadedly interconnected, said element and said member including first and second screw structures, respectively: said first screw structure comprising: at least one first screw thread extending helically in spaced thread turns, said first thread including a first load bearing flank, a first non-load bearing flank, and a first crest portion extending between said first load bearing flank and said first non-load bearing flank, and a first root extending between adjacent turns of said first thread, said first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said second screw structure comprising: at least one second screw thread extending helically in spaced thread turns, said second thread including a second load bearing flank adapted to engage said first load bearing flank, a second non-load bearing flank, and a second crest portion extending between said second load bearing flank and said second nonload bearing flank, and a second root extending between adjacent turns of said second thread, said second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread having an axial thickness greater than an axial thickness of said second thread, said major axis of said second root being longer than said major axis of said first root.
Claim 2
Dependent Claim
237 words
In combination, a threaded element and a threaded mating member adapted to be coaxially threadedly interconnected, said element and said member including first and second screw structures, respectively: said first screw structure comprising: at least one first screw thread extending helically in spaced thread turns, said first thread including a first load bearing flank, a first non-load bearing flank, and a first crest portion extending between said first load bearing flank and said first non-load bearing flank, and a first root extending between adjacent turns of said first thread, said first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said second screw structure comprising: at least one second screw thread extending helically in spaced thread turns, said second thread including a second load bearing flank adapted to engage said first load bearing flank, a second non-load bearing flank, and a second crest portion extending between said second load bearing flank and said second nonload bearing flank, and a second root extending between adjacent turns of said second thread, said second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread having an axial thickness greater than an axial thickness of said second thread, said major axis of said second root being longer than said major axis of said first root.
Claim 3
Dependent Claim
19 words
A combination according to claim 1, wherein said second generally elliptical curvature is defined by two axially overlapping ellipses.
Claim 4
Dependent Claim
22 words
A combination according to claim 1, wherein each of said first and second generally elliptical curvatures is defined by a single ellipse.
Claim 5
Dependent Claim
22 words
A combination according to claim 1, wherein said first thread constitutes a female thread and said second thread constitutes a male thread.
Claim 6
Dependent Claim
20 words
A combination according to claim 1, wherein said threaded element and said mating member comprise components of a percussion drill.
Claim 7
Dependent Claim
52 words
A combination according to claim 5, wherein said mating member comprises a hollow cylindrical case, said first thread comprising an internal thread in said case, said threaded element comprising a driver sub including internal splines adapted to drive a drill bit, said second thread comprising an external thread on said driver sub.
Claim 8
Dependent Claim
15 words
A combination according to claim 1, wherein said first and second crest portions are flat.
Claim 9
Dependent Claim
28 words
A combination according to claim 1, wherein said first and second load bearing flanks have a greater surface area than said first and second non-load bearing flanks, respectively.
Claim 10
Dependent Claim
28 words
A combination according to claim 1, wherein said first and second load bearing flanks have a smaller surface area than said first and second non-load bearing flanks, respectively.
Claim 11
Dependent Claim
57 words
A combination according to claim 1, wherein said first generally elliptical curvature has a inner axis which is shorter than a radial distance between said first crest portion and said first root, said second generally elliptical curvature having a minor axis which is shorter than a radial distance between said second crest portion and said second root.
Claim 12
Dependent Claim
18 words
A combination according to claim 1, wherein said first and second screw threads are of substantially equal height.
Claim 13
Dependent Claim
19 words
A combination according to claim 1, wherein said first and second screw threads are of a single lead type.
Claim 14
Dependent Claim
19 words
A combination according to claim 1, wherein said first and second screw threads are of a multiple lead type.
Claim 15
Dependent Claim
228 words
A threaded element adapted to be coaxially threadedly interconnected to a threaded mating member, the member having at least one first screw thread extending helically in spaced thread turns and including a first load bearing flank, a first non-load bearing flank, and a first crest portion extending between the first load bearing flank and the first non-load bearing flank, and a first root extending between adjacent turns of the first thread, the first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said threaded element comprising at least one second screw thread extending helically in spaced thread turns, said second thread including a second load bearing flank adapted to engage the first load bearing flank, a second non-load bearing flank, and a second crest portion extending between said second load bearing flank and said second non-load bearing flank, and a second root extending between adjacent turns of said second thread, said second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said second thread being of substantially equal height with the first thread and having an axial thickness less than an axial thickness of the first thread, said major axis of said second root being longer than the major axis of the first root.
Claim 16
Dependent Claim
228 words
A threaded element adapted to be coaxially threadedly interconnected to a threaded mating member, the member having at least one first screw thread extending helically in spaced thread turns and including a first load bearing flank, a first non-load bearing flank, and a first crest portion extending between the first load bearing flank and the first non-load bearing flank, and a first root extending between adjacent turns of the first thread, the first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said threaded element comprising at least one second screw thread extending helically in spaced thread turns, said second thread including a second load bearing flank adapted to engage the first load bearing flank, a second non-load bearing flank, and a second crest portion extending between said second load bearing flank and said second non-load bearing flank, and a second root extending between adjacent turns of said second thread, said second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said second thread being of substantially equal height with the first thread and having an axial thickness less than an axial thickness of the first thread, said major axis of said second root being longer than the major axis of the first root.
Claim 17
Dependent Claim
20 words
A threaded element according to claim 14, wherein said second generally elliptical curvature is defined by two axially overlapping ellipses.
Claim 18
Dependent Claim
19 words
A threaded element according to claim 14, wherein said second generally elliptical curvature is defined by a single ellipse.
Claim 19
Dependent Claim
20 words
A threaded element according to claim 16, wherein said second generally elliptical curvature is defined by two axially overlapping ellipses.
Claim 20
Dependent Claim
18 words
A threaded element according to claim 16, wherein said threaded element comprises a component of a percussion drill.
Claim 21
Dependent Claim
229 words
A threaded mating member having a first screw thread adapted to be coaxially threadedly connected to a second screw thread of a threaded element, the second screw thread extending helically in spaced thread turns and including a second load bearing flank, a second non-load bearing flank, and a second crest portion extending between the second load bearing flank and the second non-load bearing flank, and a second root extending between adjacent turns of the second thread, the second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread extending helically in spaced thread turns, said first thread including a first load bearing flank adapted to engage the first load bearing flank, a first non-load bearing flank, and a first crest portion extending between said first load bearing flank and said first non-load bearing flank, and a first root extending between adjacent turns of said first thread, said first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread being of substantially equal height with the second thread, said first thread having an axial thickness greater than an axial thickness of the second thread, and said major axis of said first root being shorter than said major axis of the second root.
Claim 22
Dependent Claim
229 words
A threaded mating member having a first screw thread adapted to be coaxially threadedly connected to a second screw thread of a threaded element, the second screw thread extending helically in spaced thread turns and including a second load bearing flank, a second non-load bearing flank, and a second crest portion extending between the second load bearing flank and the second non-load bearing flank, and a second root extending between adjacent turns of the second thread, the second root defined by a portion of a second generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread extending helically in spaced thread turns, said first thread including a first load bearing flank adapted to engage the first load bearing flank, a first non-load bearing flank, and a first crest portion extending between said first load bearing flank and said first non-load bearing flank, and a first root extending between adjacent turns of said first thread, said first root defined by a portion of a first generally elliptical curvature having a major axis extending parallel to the axial direction, said first thread being of substantially equal height with the second thread, said first thread having an axial thickness greater than an axial thickness of the second thread, and said major axis of said first root being shorter than said major axis of the second root.
Claim 23
Dependent Claim
19 words
A threaded mating member according to claim 19, wherein said mating member comprises a component of a percussion drill.
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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) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |