WO2001038685A1 - A thread joint and a male portion - Google Patents
A thread joint and a male portion Download PDFInfo
- Publication number
- WO2001038685A1 WO2001038685A1 PCT/SE2000/002200 SE0002200W WO0138685A1 WO 2001038685 A1 WO2001038685 A1 WO 2001038685A1 SE 0002200 W SE0002200 W SE 0002200W WO 0138685 A1 WO0138685 A1 WO 0138685A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thread
- spigot
- external thread
- generally cylindrical
- axial length
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
Definitions
- the present invention relates to a thread joint and a male portion according to the preambles of the independent claims.
- a conventional thread joint between two components in a rock drilling equipment for percussive drilling normally uses cut male and female threads, see for example SE-B-469,602 and US-A-4,332,502.
- a blank of steel is shaped, which includes an enlarged portion.
- the ends of the enlarged portion connect to a clearance surface or a clearance groove of smaller diameter to receive at least parts of the threading tool and to a usually conical free end.
- the enlarged portion is provided with a thread in a conventional way.
- Sharp edges are formed at the thread entrance and the exit due to the geometries of the clearance groove and the free end surface.
- Corresponding sharp edges are formed at threading of a female thread. The sharp edges make the male and female threads damage each other foremost at the respective free end during use of the joint. It is usually the male thread that limits the life span of the joint.
- One object of the present invention is to provide a thread joint of the above- mentioned type, at which a good life span is attained.
- Another object of the present invention is to provide a thread joint of the above-mentioned type, at which the male portion obtains a good life span.
- Fig. 1 shows a partly sectioned view of a thread joint according to the invention between two identical drill components.
- Fig. 2 shows a male portion according to the present invention in a perspective view.
- Fig. 3 shows a female portion in a cross-sectional perspective view.
- Fig. 4 shows a cross-section of a thread joint according to the present invention between a rock drill bit and a drill component.
- a thread joint 10 preferably consists of two drill tubes or drill rods 10A, 10B that each includes an end with a projecting spigot or male portion 12 and an end with a sleeve or female portion 13.
- the spigot has a generally cylindrical external thread 14 and the sleeve has a generally cylindrical internal thread 15.
- Each thread 14, 15 preferably has only one entrance and one exit.
- the threads 14 and 15 are conventionally designed such that when assembled abutment arises only at certain flank portions of the respective male and female portion. Contact between curved parties or between thread tips and thread bottoms do not occur.
- US-A-4,968,068, which patent hereby is incorporated into the present description a thread joint is shown in which the present invention can be utilized.
- the female portion 13 constitutes an integral part of the drill rod. Furthermore, the drill rod has a through-going flush channel 20, through which a flush medium, usually air and/or water, is transported.
- the male thread or the generally cylindrical external thread 14 includes at least one outer thread end 21 and at least one inner thread end 22 arranged in connection with the associated full profile thread.
- the female thread or the generally cylindrical internal thread 15 includes at least one outer thread end 23 and at least one inner thread end 24 arranged in connection with the associated full profile thread.
- Each thread end 21-24 includes a sharp edge due to clearances developed before threading, i.e. conical clearances 31 , 32 on the spigot 12 and cylindrical clearances 33, 34 on the sleeve 13. The edge defines the smallest radius R of the respective thread, in the longitudinal section according to Fig. 3.
- the male thread 14 and the female thread 15 has a mutual relationship as regards to the length and the position that the both thread ends or end areas 23, 24 of the female thread 15 do not contact the male thread 14 when the joint is tightened.
- do not contact is here meant that the ends 23, 24 are provided at a distance from the male thread in a tightened joint. This has been achieved as follows:
- the male thread 14 has a first axial length L1 between the thread ends 21 , 22 and the female thread 15 has a second axial length L2 between the thread ends 23, 24,
- the length L1 is shorter than the length L2. Stated another way, the distance between the conical clearances 31 , 32 is smaller than the distance between the cylindrical clearances 33, 34.
- the distance L3 between the free end surface 16 of the spigot 12 and the inner thread end or end area 24 of the female thread 15 is shorter than a distance L4 between the free end surface 16 of the spigot and the outer thread end or end area 21 of the male thread when the joint is tightened.
- the corresponding relationship applies for the outer end of the joint. That is, the distance L5 between the shoulder 19 of the spigot 12 and the outer thread end or end area 23 of the female thread 15 is shorter than a distance L6 between the shoulder 19 of the spigot and the inner thread end or end area 22 of the male thread when the joint is tightened.
- the outer and inner ends of the spigot 12 includes conical guiding surfaces 25, 26 which shall cooperate axially on each side of the female thread 15 with conical guiding surfaces 27 and 28, respectively. All cone apices of the conical guiding surfaces are directed in the impact direction F.
- the length L1 of the male thread 14 is 50-80% of the length L of the spigot. Both end areas 21 , 22 of the male thread 14 are provided at the distances L4, L6 from the ends 16, 19 of the spigot.
- a trapezoidal thread is shown in the embodiment but it is understood that the invention can be used in connection with all for percussive rock drilling serviceable threads, such as rope threads for example.
- the female portion or the male portion may alternatively be integral with a rock drill bit instead of being integral with a drill rod or a drill tube.
- Fig. 4 is shown how a rock drill bit 10C for percussive rock drilling with hard metal buttons 30 appear in a thread joint according to the present invention, with the same reference numerals as is used above.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00980172A EP1240406A1 (en) | 1999-11-26 | 2000-11-10 | A thread joint and a male portion |
CA002392411A CA2392411A1 (en) | 1999-11-26 | 2000-11-10 | A thread joint and a male portion |
AU17468/01A AU1746801A (en) | 1999-11-26 | 2000-11-10 | A thread joint and a male portion |
BR0015602-7A BR0015602A (en) | 1999-11-26 | 2000-11-10 | Threaded joint and a male portion |
JP2001540011A JP2003515021A (en) | 1999-11-26 | 2000-11-10 | Threaded joint and male thread |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904323A SE516874C2 (en) | 1999-11-26 | 1999-11-26 | Threaded joint for striking drilling and trade included in the threaded joint |
SE9904323-4 | 1999-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001038685A1 true WO2001038685A1 (en) | 2001-05-31 |
Family
ID=20417896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/002200 WO2001038685A1 (en) | 1999-11-26 | 2000-11-10 | A thread joint and a male portion |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1240406A1 (en) |
JP (1) | JP2003515021A (en) |
AU (1) | AU1746801A (en) |
BR (1) | BR0015602A (en) |
CA (1) | CA2392411A1 (en) |
SE (1) | SE516874C2 (en) |
WO (1) | WO2001038685A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6978852B2 (en) | 2002-05-17 | 2005-12-27 | Sandvik Ab | Rock drill product and method |
CN100335739C (en) * | 2002-06-27 | 2007-09-05 | 山特维克知识产权股份有限公司 | Male portion, drill bit and threaded joint for percussive rock drilling |
EP2383420A1 (en) * | 2010-04-29 | 2011-11-02 | Sandvik Intellectual Property AB | Drill bit for percussive rock drilling |
EP3971385A1 (en) * | 2020-09-17 | 2022-03-23 | Sandvik Mining and Construction Tools AB | Drill string joint design |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5358492B2 (en) * | 2009-09-08 | 2013-12-04 | 株式会社ジオ機材 | Connection structure for hammering rod |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3537738A (en) * | 1968-04-15 | 1970-11-03 | Sandvikens Jernverks Ab | Drill rod for long hole drilling in the ground |
DE2115935A1 (en) * | 1970-05-04 | 1971-11-18 | Sandvikens Jernverks Ab, Sandviken (Schweden) | Coupling thread for hammer drill bars |
EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
-
1999
- 1999-11-26 SE SE9904323A patent/SE516874C2/en unknown
-
2000
- 2000-11-10 WO PCT/SE2000/002200 patent/WO2001038685A1/en not_active Application Discontinuation
- 2000-11-10 CA CA002392411A patent/CA2392411A1/en not_active Abandoned
- 2000-11-10 EP EP00980172A patent/EP1240406A1/en not_active Withdrawn
- 2000-11-10 JP JP2001540011A patent/JP2003515021A/en active Pending
- 2000-11-10 AU AU17468/01A patent/AU1746801A/en not_active Abandoned
- 2000-11-10 BR BR0015602-7A patent/BR0015602A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3537738A (en) * | 1968-04-15 | 1970-11-03 | Sandvikens Jernverks Ab | Drill rod for long hole drilling in the ground |
DE2115935A1 (en) * | 1970-05-04 | 1971-11-18 | Sandvikens Jernverks Ab, Sandviken (Schweden) | Coupling thread for hammer drill bars |
EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
SE469603B (en) * | 1988-07-08 | 1993-08-02 | Sandvik Ab | GAENGFOERBAND |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6978852B2 (en) | 2002-05-17 | 2005-12-27 | Sandvik Ab | Rock drill product and method |
CN100335739C (en) * | 2002-06-27 | 2007-09-05 | 山特维克知识产权股份有限公司 | Male portion, drill bit and threaded joint for percussive rock drilling |
KR101006360B1 (en) | 2002-06-27 | 2011-01-10 | 산드빅 인터렉츄얼 프로퍼티 에이비 | Male portion, drill bit and threaded joint for percussive rock drilling |
EP2383420A1 (en) * | 2010-04-29 | 2011-11-02 | Sandvik Intellectual Property AB | Drill bit for percussive rock drilling |
AU2011245728B2 (en) * | 2010-04-29 | 2015-03-19 | Sandvik Intellectual Property Ab | Drill bit for percussive rock drilling |
US9500037B2 (en) | 2010-04-29 | 2016-11-22 | Sandvik Intellectual Property Ab | Drill bit for percussive rock drilling |
EP3971385A1 (en) * | 2020-09-17 | 2022-03-23 | Sandvik Mining and Construction Tools AB | Drill string joint design |
WO2022058420A1 (en) * | 2020-09-17 | 2022-03-24 | Sandvik Mining And Construction Tools Ab | Drill string joint design |
Also Published As
Publication number | Publication date |
---|---|
EP1240406A1 (en) | 2002-09-18 |
SE516874C2 (en) | 2002-03-19 |
CA2392411A1 (en) | 2001-05-31 |
SE9904323L (en) | 2001-05-27 |
SE9904323D0 (en) | 1999-11-26 |
BR0015602A (en) | 2002-07-09 |
JP2003515021A (en) | 2003-04-22 |
AU1746801A (en) | 2001-06-04 |
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