EP0077336A1 - An extension coupling for rock drilling equipment. - Google Patents
An extension coupling for rock drilling equipment.Info
- Publication number
- EP0077336A1 EP0077336A1 EP82901041A EP82901041A EP0077336A1 EP 0077336 A1 EP0077336 A1 EP 0077336A1 EP 82901041 A EP82901041 A EP 82901041A EP 82901041 A EP82901041 A EP 82901041A EP 0077336 A1 EP0077336 A1 EP 0077336A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupling
- rod
- sleeve
- screw
- plain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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 an extension coupling for rock drilling equipment, comprising a coupling rod having a screw-threaded portion with an external thread of smaller diameter than the diameter of the non-threaded part of the rod, and a sleeve-like portion having a part provided with an internal thread corresponding to the external thread of said rod.
- a coupling rod having a screw-threaded portion with an external thread of smaller diameter than the diameter of the non-threaded part of the rod, and a sleeve-like portion having a part provided with an internal thread corresponding to the external thread of said rod.
- the power of the drilling machine is increased by increasing the percussion energy of the hammer of the drilling machine, and also by increas ⁇ ing the torque of the machine, or by increasing the pressure at which the drilling equipment is fed against the rod, or by means of a co ⁇ bination of these measures.
- a drill bit or a coupling sleeve is mounted onto the coupling rod via a coupling joint, for example screwed. It is also conventional for the length of the hollowed portion in the drill bit or
- An object of the present invention is to provide a supporting action effective to increase the bending stresses in said sensitive or risk sections, by extending the drill bit and coupling sleeve.
- the extension coupling according to the invention is characterized in that the sleeve-shaped part includes an extension in the form of a non-threaded skirt- shaped portion which extends from the threaded part of the sleeve-shaped portion to its outer end, and which embraces a part of the coupling rod behind the screw- thread, to provide a supporting effect which decreases the bending stresses on the coupling.
- the extension coupling is charac ⁇ terized in that the extension having the form of a non- threaded skirt-like portion of the sleeve-like part has an innter diameter which is slide-fitted to the outer diameter of the non-threaded part of the coupling rod.
- the extension coupling according to the invention has the advantage of eliminating practically completely the occurrence of bending stresses at said sensitive or risk sections of the drill rods, and also the dangerous fatigue effects of said bending stresses .
- the extended part of the skirt of the drill bit or coupling sleeve has a ⁇ uppor ⁇ ing effect and because it assists in reducing the occurrence of harr.ful bending stresses in operation it is effective in reducing the risk of fracture at the
- Figure 1 is a partial sectional view of a drill bit pro ⁇ vided with an extended skirt in accordance with the inven ⁇ tion
- Figure 2 is a partial sectional view through a coupling sleeve provided with an extended skirt in accordance with the invention.
- FIG. 1 there is shown a coupling rod 1 which is provided with a screw-thred and which has a drill bit 2 screwed thereonto.
- the coupling rod has a screw-threaded portion 3 which meshes with a corresponding screw-threaded portion 4 of the drill bit.
- the drill bit has an extended skirt 5, the end part of which is slide-fitted over the plain part 6 of the coupling rod, i.e. the part thereof not provided with a screw thread.
- the inner diameter of the skirt 5 is a slightly greater or substantially equal to the outer diameter of the coupling rod, while the length of said skirt is such that subsequent to assembling the coupling the skirt will extend over the necked portion 7 of the coupling rod, said necked portion forr.ing a weak or sensitive section, and continues up along the plain portion 6 of the coupling rod.
- Figure 2 illustrates two coupling rods 8 and 9 which are also provided with a screw-thread and screwed into a coupling sleeve 10 so that the mutually opposing ends of said rods abut each other.
- the screw-threaded portion 12 of the coupling rod 9 meshes with the screw-threaded portion 13 of the sleeve, and the extended skirt 14 of said sleeve extends over the necked portion 15 of the rod and continues up along the plain part 16 of said rod.
- the skirt 14 is a slide fit with the plain portion 16 and thus has an inner diameter which is somewhat greater or substantially equal to the outer diameter of ⁇ he plain portion 16.
- V ⁇ :PO extension have been described with reference to screw- threads it will be understood that other types of screw- threads can be used, such as different types of sawtooth threads, different types of rope-threads and different types of round threads, and other types of threads .
- the extended skirt passes beyond the necked portion of the coupling rod and embraces the plain part of said rod. It is also possible, however, to make the skirt shorter, so that it does not reach across the plain portion of the rod, but embraces solely the necked portion or a part of said necked portion, for example by being made a slide- fit with said portion.
- the coupling rod without the necked portion, in which case the plain portions 6, 16 of the illustrated embodiments are connected directly to the screw-threaded portions 3 , 12.
- an intermediate sleeve made of a plastics or rubber material, or some other soft and damping material, can be arranged between the extended skirt and the coupling rod.
Abstract
Un couplage de rallonge pour un equipement de forage de roche comprend une tige de couplage (1) possedant une partie filetee (3) pourvue d'un filet exterieur dont le diametre est inferieur au diametre de la partie non filetee (6) de la tige, et une partie semblable a un manchon (2) avec une portion (4) pourvue d'un filetage interieur correspondant au filetage exterieur de la tige. La partie en forme de vis (2) comprend une rallonge (5) en forme d'une partie de jupe plane s'etendant depuis la portion filetee (4) de la partie en forme de manchon jusqu'a l'extremite exterieure de celle-ci et qui entoure une partie (6) de la portion plane de la tige de couplage. Selon l'invention, la jupe (5) a un effet de support qui reduit toute manifestation d'effort de flexion dans le couplage.An extension coupling for rock drilling equipment comprises a coupling rod (1) having a threaded part (3) provided with an external thread whose diameter is less than the diameter of the unthreaded part (6) of the rod , and a part similar to a sleeve (2) with a portion (4) provided with an internal thread corresponding to the external thread of the rod. The screw-shaped part (2) comprises an extension (5) in the form of a flat skirt part extending from the threaded portion (4) of the sleeve-shaped part to the outer end of that -this and which surrounds a part (6) of the planar portion of the coupling rod. According to the invention, the skirt (5) has a support effect which reduces any manifestation of bending force in the coupling.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT8282901041T ATE13925T1 (en) | 1981-04-24 | 1982-03-26 | COUPLING EXTENSION FOR ROCK DRILLING MACHINES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8102626A SE426089B (en) | 1981-04-24 | 1981-04-24 | CUTTING COMPOUNDS FOR MOUNTAIN DRILL EQUIPMENT |
SE8102626 | 1981-04-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0077336A1 true EP0077336A1 (en) | 1983-04-27 |
EP0077336B1 EP0077336B1 (en) | 1985-06-19 |
Family
ID=20343676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82901041A Expired EP0077336B1 (en) | 1981-04-24 | 1982-03-26 | An extension coupling for rock drilling equipment |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0077336B1 (en) |
AU (1) | AU547091B2 (en) |
CA (1) | CA1178944A (en) |
DE (1) | DE3264233D1 (en) |
FI (1) | FI77303C (en) |
IE (1) | IE52613B1 (en) |
SE (1) | SE426089B (en) |
WO (1) | WO1982003653A1 (en) |
ZA (1) | ZA822203B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2553171B1 (en) * | 1983-10-03 | 1988-04-08 | Dril Quip Inc | APPARATUS AND METHOD FOR CONNECTING PARTICULARLY CYLINDRICAL ELEMENTS SUCH AS TUBES |
SE8600199L (en) * | 1986-01-17 | 1987-07-18 | Loevab Loef Och Oestlund Ab | Drilling Tools |
US5622820A (en) * | 1988-03-10 | 1997-04-22 | City Of Hope | Method for amplification and detection of RNA and DNA sequences |
SE522221C2 (en) * | 2001-10-12 | 2004-01-27 | Sandvik Ab | Striking rock drill joints |
JP4954542B2 (en) | 2005-12-09 | 2012-06-20 | 三菱マテリアル株式会社 | Drilling rod, drilling bit and drilling tool |
US20100059285A1 (en) * | 2006-05-17 | 2010-03-11 | Carlstroem Bo | Top hammer rock-drilling tool, a drill rod coupling sleeve |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2122757A (en) * | 1935-07-05 | 1938-07-05 | Hughes Tool Co | Drill stem coupling |
SE401232B (en) * | 1970-05-04 | 1978-04-24 | Sandvik Ab | THREADED CONNECTION FOR IMPACT BRUSHES |
-
1981
- 1981-04-24 SE SE8102626A patent/SE426089B/en not_active IP Right Cessation
-
1982
- 1982-03-26 DE DE8282901041T patent/DE3264233D1/en not_active Expired
- 1982-03-26 AU AU82756/82A patent/AU547091B2/en not_active Ceased
- 1982-03-26 WO PCT/SE1982/000091 patent/WO1982003653A1/en active IP Right Grant
- 1982-03-26 EP EP82901041A patent/EP0077336B1/en not_active Expired
- 1982-03-31 ZA ZA822203A patent/ZA822203B/en unknown
- 1982-04-08 CA CA000400710A patent/CA1178944A/en not_active Expired
- 1982-04-23 IE IE955/82A patent/IE52613B1/en unknown
- 1982-12-16 FI FI824324A patent/FI77303C/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO8203653A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI824324L (en) | 1982-12-16 |
DE3264233D1 (en) | 1985-08-01 |
IE820955L (en) | 1982-10-24 |
ZA822203B (en) | 1983-02-23 |
CA1178944A (en) | 1984-12-04 |
FI77303C (en) | 1989-02-10 |
IE52613B1 (en) | 1987-12-23 |
SE8102626L (en) | 1982-10-25 |
AU547091B2 (en) | 1985-10-03 |
WO1982003653A1 (en) | 1982-10-28 |
FI824324A0 (en) | 1982-12-16 |
AU8275682A (en) | 1982-11-04 |
EP0077336B1 (en) | 1985-06-19 |
FI77303B (en) | 1988-10-31 |
SE426089B (en) | 1982-12-06 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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