WO2009031166A1 - Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices - Google Patents
Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices Download PDFInfo
- Publication number
- WO2009031166A1 WO2009031166A1 PCT/IT2007/000606 IT2007000606W WO2009031166A1 WO 2009031166 A1 WO2009031166 A1 WO 2009031166A1 IT 2007000606 W IT2007000606 W IT 2007000606W WO 2009031166 A1 WO2009031166 A1 WO 2009031166A1
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- WO
- WIPO (PCT)
- Prior art keywords
- equipment used
- fact
- drill rods
- vice
- unscrew
- Prior art date
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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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe
- E21B19/163—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe piston-cylinder actuated
Definitions
- Equipment used to unscrew drill rods of the type composed of an overlapped pair of vices.
- the present patent application relates to an equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices, a fixed vice for tightening and a rotary vice for unscrewing.
- the equipment of the invention is used in known drilling machines that employ a drilling tool mounted at the base of a vertical series of rods driven into rotation by a suitable rotary motor group.
- a second rod is screwed onto the first rod to increase the drilling depth.
- a rod unscrewing equipment must be used during this phase, being traditionally composed of a lower fixed vice that supports a second vice, which rotates in two directions with respect to the first vice and is actuated by means of a hydraulic cylinder known as rotary cylinder.
- Each vice is composed of an overlapped pair of jaws actuated by corresponding hydraulic cylinders.
- the support frame of the rotary vice is coupled with the bearing frame of the fixed vice by means of a semi-circular ring that acts as connection and guide between the two vices.
- the rotary cylinder is pivoted to the frame of the fixed vice on one side, and to the frame of the rotary vice on the other side, which receives a thrust laying on a horizontal plane higher than the plane of the connection and guide ring.
- the ring is subjected to flexural stress during the rotation of the rotary vice, with consequent complicated design and higher wear of the rubbing surfaces, which can cause the misalignment of the upper vice with respect to the lower vice.
- the purpose of the present invention is to provide a remedy to the aforementioned inconveniences, by devising a new rod unscrewing equipment in which the mobile vice is guided by a pair of semicircular rings, an upper and a lower ring, with a rotary cylinder between them, whose thrust lays on a central plane with respect to the planes of the rings, in such a way that the guide means of the rotary vice are no longer subjected to flexural stress.
- a further purpose of the present invention is to devise a rod- unscrewing equipment composed of two independent vices that can be mounted in paired configuration, one above the other, or mounted at a distance according to the specific needs, in order not to constrain the tightening point of both vices.
- a further purpose of the present invention is to devise a rod unscrewing equipment composed of two independent vices obtained with identical construction parts, in order to reduce production and storage costs.
- the aforementioned purposes have been obtained by the present invention, according to the main characteristics described in the first claim.
- the equipment of the invention is composed of two independent vices with the same shell structure designed to contain and support the pair of opposite cylinders that actuate the jaws used to tighten the rod.
- the only difference between the upper and the lower vice consists in the fact that the shell structure of the upper vice is contained inside a cradle- shaped frame formed of two identical brackets, an upper and a lower bracket, connected by spacing uprights.
- the cradle-shaped frame supports a pair of rings, an upper and a lower ring, screwed on corresponding brackets.
- the rotary vice can move internally thanks to a rotary cylinder pivoted to the cradle on one side and to the shell structure on the other side.
- Both vices have independent structures that can either work in pair or individually, being mounted one on top of the other one by simply fitting the cradle frame of the mobile vice above the fixed vice.
- - figure 1 is an axonometric view of the equipment of the invention, in which the jaws of both vices are open;
- FIG. 2 is an axonometric view of the lower vice of the equipment of the invention, in which the jaws are open;
- FIG. 3 is an axonometric view of the upper vice of the equipment of the invention, in which the jaws are open;
- - figure 4 is an axonometric view of the equipment of the invention with an overlapped pair of drilling rods positioned between the open jaws;
- - figure 5 is the same as figure 4, except for the fact that the jaws of the lower vice are closed;
- figure 6 is the same as figure 5, except for the fact that the upper vice has made a backward rotation before tightening the upper rod;
- figure 7 is the same as figure 6, except for the fact that the jaws of the rotary vice are closed on the upper rod;
- figure 8 is the same as figure 7, except for the fact that the rotary vice is at the end of the unscrewing travel;
- FIG. 9 is an exploded axonometric view of a jaw of the vices and of the pair of tempered anti-slip inserts;
- FIG 10 is an exploded axonometric view of the back of the jaw shown in figure 9.
- the equipment (A) of the invention is composed of a coaxial overlapped pair of vices (1 and 2), a lower fixed vice (1) and an upper rotary vice (2).
- the lower vice (1 ) is composed of a shell structure formed of two identical U-shaped plates (1a) that support an opposite pair of cylinders (1 b).
- the plates (1a) are connected on the parallel sides (1c) by two box-shaped elements (1d) that house a corresponding jaw (1e) with sliding guides (1 E) and actuation cylinder (1 b).
- the plates (1a) are connected on the back of the transversal side (1f) by means of small plates (1g) designed to fix the vice (1) to a bearing frame, not shown in the enclosed figures.
- Each plate (1a) is provided with a groove (1h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (1b) and is equidistant from the cylinders (1 b).
- the upper vice (2) comprises a fixed cradle frame (3) that houses a shell structure identical to the shell structure of the lower fixed vice (1), with possibility of rotation around the said vertical axis (Y).
- the shell structure of the vice (2) is composed of two identical U-shaped plates (2a) that support an opposite pair of cylinders (2b).
- the plates (2a) are connected on the parallel sides (2c) by two box- shaped elements (2d) that house a corresponding jaw (2e) with sliding guides (2E) and actuation cylinder (2b).
- Each plate (2a) is provided with a groove (2h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (2b) and is equidistant from the cylinders (2b).
- the cradle frame (3) is composed of two identical parallel brackets (3a and 3b), a lower (3a) and an upper (3b) U-shaped bracket, connected by means of spacing uprights (3c) and small plates (3d) on the back, used to fasten the cradle (3) to a bearing frame, not shown in the enclosed figures.
- Two semicircular rings (4a and 4b) are symmetrically mounted above and under the cradle frame (3) and respectively fixed under the lower bracket (3a) and above the upper bracket (3b),
- Each ring (4a and 4b) is provided with a groove (5a and 5b) that houses a semicircular guide section (6a and 6b) inserted and firmly stopped in the groove (2h) of the rotary vice (2).
- Two lateral elements (2i) are obtained along the external perimeter of the plates (2a) with housing for a vertical pin (7) on which the end of the stem (8a) of the rotary cylinder (8) is pivoted, with the cylinder sleeve (8b) fixed to the cradle frame (3).
- the axis of the rotary cylinder (8) and the axis (X) of the opposite pair of cylinders (2b) used to actuate the jaws (2e) of the rotary vice (2) lay on the same symmetrical plane of the overlapped pair of rings (4a and 4b).
- each jaw (1e or 2e) is composed of a stem (9) that acts as support for a front pair of tempered interchangeable inserts (10) with anti-slip rough surface.
- the stem (9) has a V-shaped front wall with two housings (9a) that partially contain the tempered inserts (10), which are stopped by means of elastic pins (11) inserted into suitable holes (9b) obtained on the borders of the housings (9a) and holes (10a) obtained on the borders of the said inserts (10).
- the holes (9b and 10a) are perpendicular to the axis (X) of the cylinder (1 b or 2b).
- the stopping system of the inserts (10) by means of elastic pins (11 ) is characterised by simple fast mounting and dismounting.
- the insert (9) can be blocked on the stem (10) by simply cantering it in the corresponding housing (9a) and then inserting the elastic pins (11) in the corresponding holes (9b and 10a).
- each hole (10a) ends into a niche (10b) obtained on the back (10c) of the insert (10), which can be uncoupled from the corresponding stem by simply pushing the pins (11) inside the holes (10a and 9b) until they fall inside the niche (10c).
Abstract
The present invention relates to an equipment used to unscrew drill rods, of the type composed of a coaxial overlapped pair of vices (1 and 2), a lower fixed vice (1) and an upper rotary vice (2), provided with means (4a and 4b, 5a and 5b, 6a and 6b) designed to guide the rotation around a vertical axis (Y) of the support structure of the jaws (2e) of the rotary vice (2), which is driven into rotation by suitable actuation means (8) that exert a force on the same plane positioned between the pair of the said guide means (4a and 4b, 5a and 5b, 6a and 6b).
Description
Description
Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices.
The present patent application relates to an equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices, a fixed vice for tightening and a rotary vice for unscrewing.
The equipment of the invention is used in known drilling machines that employ a drilling tool mounted at the base of a vertical series of rods driven into rotation by a suitable rotary motor group.
Obviously, a new rod is added when the drilling depth is higher than the length of a rod.
More precisely, once the drilling machine has drilled the soil using the entire length of a rod, a second rod is screwed onto the first rod to increase the drilling depth.
The deeper the drilling depth, the more rods must be screwed one after the other one.
Obviously, when the desired depth is reached, the series of rods must be raised and removed from the drilling hole by progressively unscrewing the rods.
A rod unscrewing equipment must be used during this phase, being traditionally composed of a lower fixed vice that supports a second vice, which rotates in two directions with respect to the first vice and is actuated by means of a hydraulic cylinder known as rotary cylinder.
Each vice is composed of an overlapped pair of jaws actuated by corresponding hydraulic cylinders.
More precisely, the support frame of the rotary vice is coupled with the bearing frame of the fixed vice by means of a semi-circular ring that acts as connection and guide between the two vices.
The rotary cylinder is pivoted to the frame of the fixed vice on one side, and to the frame of the rotary vice on the other side, which receives a thrust
laying on a horizontal plane higher than the plane of the connection and guide ring.
In view of the above, the ring is subjected to flexural stress during the rotation of the rotary vice, with consequent complicated design and higher wear of the rubbing surfaces, which can cause the misalignment of the upper vice with respect to the lower vice.
Another inconvenience of the said rod-unscrewing equipment of known type consists in the fact that the two vices cannot be removed or used independently, since the guide means of the upper rotary vice are obtained in the structure of the lower fixed vice.
Consequently, the position of the equipment along the series of rods cannot be modified, and must allow the lower vice to be positioned near the top of the lower rod, in such a way that the upper rotary vice can tighten the base of the upper rod to be unscrewed. The purpose of the present invention is to provide a remedy to the aforementioned inconveniences, by devising a new rod unscrewing equipment in which the mobile vice is guided by a pair of semicircular rings, an upper and a lower ring, with a rotary cylinder between them, whose thrust lays on a central plane with respect to the planes of the rings, in such a way that the guide means of the rotary vice are no longer subjected to flexural stress.
A further purpose of the present invention is to devise a rod- unscrewing equipment composed of two independent vices that can be mounted in paired configuration, one above the other, or mounted at a distance according to the specific needs, in order not to constrain the tightening point of both vices.
A further purpose of the present invention is to devise a rod unscrewing equipment composed of two independent vices obtained with identical construction parts, in order to reduce production and storage costs. The aforementioned purposes have been obtained by the present invention, according to the main characteristics described in the first claim. The equipment of the invention is composed of two independent vices
with the same shell structure designed to contain and support the pair of opposite cylinders that actuate the jaws used to tighten the rod.
The only difference between the upper and the lower vice consists in the fact that the shell structure of the upper vice is contained inside a cradle- shaped frame formed of two identical brackets, an upper and a lower bracket, connected by spacing uprights.
The cradle-shaped frame supports a pair of rings, an upper and a lower ring, screwed on corresponding brackets.
While the cradle-shaped frame remains fixed, the rotary vice can move internally thanks to a rotary cylinder pivoted to the cradle on one side and to the shell structure on the other side.
It must be noted that the axis of the rotary cylinder and the axis of the opposite pair of cylinders used to actuate the jaws of the rotary vice lay on the same symmetrical plane of the overlapped pair of rings that are therefore subjected to identical loads with uniform wear.
Both vices have independent structures that can either work in pair or individually, being mounted one on top of the other one by simply fitting the cradle frame of the mobile vice above the fixed vice.
For major clarity the description of the equipment of the present invention continues with reference to the enclosed drawings, which only have an illustrative, not limiting purposes, whereby:
- figure 1 is an axonometric view of the equipment of the invention, in which the jaws of both vices are open;
- figure 2 is an axonometric view of the lower vice of the equipment of the invention, in which the jaws are open;
- figure 3 is an axonometric view of the upper vice of the equipment of the invention, in which the jaws are open;
- figure 4 is an axonometric view of the equipment of the invention with an overlapped pair of drilling rods positioned between the open jaws; - figure 5 is the same as figure 4, except for the fact that the jaws of the lower vice are closed;
- figure 6 is the same as figure 5, except for the fact that the upper vice
has made a backward rotation before tightening the upper rod;
- figure 7 is the same as figure 6, except for the fact that the jaws of the rotary vice are closed on the upper rod;
- figure 8 is the same as figure 7, except for the fact that the rotary vice is at the end of the unscrewing travel;
- figure 9 is an exploded axonometric view of a jaw of the vices and of the pair of tempered anti-slip inserts;
- figure 10 is an exploded axonometric view of the back of the jaw shown in figure 9. With reference to figure 1 , the equipment (A) of the invention is composed of a coaxial overlapped pair of vices (1 and 2), a lower fixed vice (1) and an upper rotary vice (2).
As shown in figure 2, the lower vice (1 ) is composed of a shell structure formed of two identical U-shaped plates (1a) that support an opposite pair of cylinders (1 b).
More precisely, the plates (1a) are connected on the parallel sides (1c) by two box-shaped elements (1d) that house a corresponding jaw (1e) with sliding guides (1 E) and actuation cylinder (1 b).
Moreover, the plates (1a) are connected on the back of the transversal side (1f) by means of small plates (1g) designed to fix the vice (1) to a bearing frame, not shown in the enclosed figures.
Each plate (1a) is provided with a groove (1h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (1b) and is equidistant from the cylinders (1 b).
As shown in figure 3, the upper vice (2) comprises a fixed cradle frame (3) that houses a shell structure identical to the shell structure of the lower fixed vice (1), with possibility of rotation around the said vertical axis (Y).
More precisely, the shell structure of the vice (2) is composed of two identical U-shaped plates (2a) that support an opposite pair of cylinders (2b).
The plates (2a) are connected on the parallel sides (2c) by two box- shaped elements (2d) that house a corresponding jaw (2e) with sliding guides
(2E) and actuation cylinder (2b).
Each plate (2a) is provided with a groove (2h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (2b) and is equidistant from the cylinders (2b).
The cradle frame (3) is composed of two identical parallel brackets (3a and 3b), a lower (3a) and an upper (3b) U-shaped bracket, connected by means of spacing uprights (3c) and small plates (3d) on the back, used to fasten the cradle (3) to a bearing frame, not shown in the enclosed figures. Two semicircular rings (4a and 4b) are symmetrically mounted above and under the cradle frame (3) and respectively fixed under the lower bracket (3a) and above the upper bracket (3b),
Each ring (4a and 4b) is provided with a groove (5a and 5b) that houses a semicircular guide section (6a and 6b) inserted and firmly stopped in the groove (2h) of the rotary vice (2).
Two lateral elements (2i) are obtained along the external perimeter of the plates (2a) with housing for a vertical pin (7) on which the end of the stem (8a) of the rotary cylinder (8) is pivoted, with the cylinder sleeve (8b) fixed to the cradle frame (3). The axis of the rotary cylinder (8) and the axis (X) of the opposite pair of cylinders (2b) used to actuate the jaws (2e) of the rotary vice (2) lay on the same symmetrical plane of the overlapped pair of rings (4a and 4b).
With reference to figures 9 and 10, each jaw (1e or 2e) is composed of a stem (9) that acts as support for a front pair of tempered interchangeable inserts (10) with anti-slip rough surface.
More precisely, the stem (9) has a V-shaped front wall with two housings (9a) that partially contain the tempered inserts (10), which are stopped by means of elastic pins (11) inserted into suitable holes (9b) obtained on the borders of the housings (9a) and holes (10a) obtained on the borders of the said inserts (10).
The holes (9b and 10a) are perpendicular to the axis (X) of the cylinder (1 b or 2b).
The stopping system of the inserts (10) by means of elastic pins (11 ) is characterised by simple fast mounting and dismounting.
The insert (9) can be blocked on the stem (10) by simply cantering it in the corresponding housing (9a) and then inserting the elastic pins (11) in the corresponding holes (9b and 10a).
In order to ensure the fast removal of the insert (9), each hole (10a) ends into a niche (10b) obtained on the back (10c) of the insert (10), which can be uncoupled from the corresponding stem by simply pushing the pins (11) inside the holes (10a and 9b) until they fall inside the niche (10c).
Claims
Claims
1 ) Equipment used to unscrew drill rods, of the type composed of a coaxial overlapped pair of vices (1 and 2), one lower fixed vice (1 ) and one upper rotary vice (2), provided with means designed to guide the rotation around a vertical axis (Y) of the support shell structure of the jaws (2e) of the rotary vice (2), which is driven into rotation by suitable actuation means (8); equipment (A) being characterised by the fact that the rotary vice (2) comprises a cradle frame (3) composed of two identical parallel brackets (3a and 3b), one lower bracket (3a) and one upper bracket (3b), each of the them being provided with guide means (4a and 4b, 5a and 5b, 6a and 6b) designed to permit the rotation inside the cradle frame (3) around the axis (Y) of the said shell structure on which the actuation means (8) exert a force laying on a plane positioned between the pair of guide means (4a and 4b, 5a and 5b, 6a and 6b).
2) Equipment used to unscrew drill rods, as claimed in claim 1 , characterised by the fact that the actuation means (8) exert a force laying on an intermediate plane between the pair of guide means (4a and 4b, 5a and 5b, 6a and 6b).
3) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that the actuation means (8) consist in a cylinder (8) whose sleeve (8b) is fixed to the cradle frame (3), while the end of the stem (8a) is pivoted to a vertical pin (7), with housings located on two (2i) obtained along the external perimeter of the plates (2a).
4) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that the lower vice (1 ) is composed of a shell structure composed of two plates (1a) connected on the parallel sides (1c) by two box-shaped elements (1d), each of them housing a jaw (1e) with actuation cylinder (1 b).
5) Equipment used to unscrew drill rods as claimed in the preceding claim, characterised by the fact the plates (1a) are identical and U-shaped. 6) Equipment used to unscrew drill rods as claimed in the preceding claim,
characterised by the fact the plates (1a) are connected on the back of the transversal side (1f) by means of plates (1g).
7) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that each plate (1a) is provided with a groove (1 h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (1b) and is equidistant from the cylinders (1 b).
8) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that the shell structure of the vice (2) is composed of two plates (2a) connected on the parallel sides (2c) by two box- shaped elements (2d), each of them housing a jaw (2e) with actuation cylinder (2b).
9) Equipment used to unscrew drill rods as claimed in the preceding claim, characterised by the fact the plates (2a) are identical and U-shaped. 10) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that each plate (2a) is provided with a groove (2h) having a semicircular profile with centre on a vertical axis (Y) that intersects the longitudinal axis (X) of the opposite pair of cylinders (2b) and is equidistant from the cylinders (2b). 11) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that the parallel brackets (3a and 3b) are Li- shaped and connected by means of spacing uprights (3c) on the side and plates (3d) on the back.
12) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that the guide means (4a and 4b, 5a and 5b,
6a and 6b) consist in a pair of semicircular rings (4a and 4b) symmetrically mounted above and under the cradle frame (3), respectively fixed under the lower bracket (3a) and above the upper bracket (3b); it being provided that each ring (4a and 4b) is provided with a groove (5a and 5b) that houses a semicircular guide section (6a and 6b) connected with the plate (2a).
13) Equipment used to unscrew drill rods as claimed in the preceding claim, characterised by the fact that each semicircular guide section (6a and 6b) is
inserted and firmly stopped in the groove (2h) of the rotary vice (2).
14) Equipment used to unscrew drill rods as claimed in one of the preceding claims, characterised by the fact that each jaw (1e or 2e) is composed of a stem (9) with a concave front wall with one or more housings (9a) that partially contain corresponding tempered inserts (10), which are stopped by means of elastic pins (11) inserted into suitable holes (9b) obtained on the borders of each housing (9a) and holes (10a) obtained on the borders of each insert (10).
15) Equipment used to unscrew drill rods as claimed in the preceding claim, characterised by the fact the holes (9b and 10a) are perpendicular to the longitudinal axis (X) of the cylinder (1 b or 2b).
16) Equipment used to unscrew drill rods as claimed in claims 14 and 15, characterised by the fact that each hole (10a) ends into a niche (10b) obtained on the back (10c) of the insert (10). 17) Equipment used to unscrew drill rods as claimed in claims 14, 15 and 16, characterised by the fact that the front wall is V-shaped and provided with two housings (9a) that partially contain two tempered inserts (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IT2007/000606 WO2009031166A1 (en) | 2007-09-03 | 2007-09-03 | Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IT2007/000606 WO2009031166A1 (en) | 2007-09-03 | 2007-09-03 | Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009031166A1 true WO2009031166A1 (en) | 2009-03-12 |
Family
ID=39363973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2007/000606 WO2009031166A1 (en) | 2007-09-03 | 2007-09-03 | Equipment used to unscrew drill rods, of the type composed of an overlapped pair of vices |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2009031166A1 (en) |
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| WO2013036138A3 (en) * | 2011-09-09 | 2013-09-19 | National Oilwell Varco Norway As | Guide system and method for operation of same |
| WO2014159897A1 (en) * | 2013-03-14 | 2014-10-02 | Faleski, Thaddeus J. | Concentric low profile clamping systems and methods for making and breaking threaded connections |
| WO2015063329A3 (en) * | 2013-11-04 | 2015-12-17 | Totech Industriutveckling Ab | An improved pipe gripper |
| GR1009556B (en) * | 2018-01-25 | 2019-07-02 | Νικολαος Σωτηριου Βρουσιας | Screwing and unscrewing mechanism for drilling tubes of any type |
| US10718170B2 (en) | 2017-07-10 | 2020-07-21 | Vermeer Manufacturing Company | Vise arrangement for an underground drilling machine |
| CN111551703A (en) * | 2020-05-25 | 2020-08-18 | 嵊州风浦医疗设备科技有限公司 | Efficient portable helicobacter pylori apparatus |
| SE1950880A1 (en) * | 2019-07-10 | 2021-01-11 | Totech Ind Ab | Holding device and method for a pipe gripping assembly |
| CN115059414A (en) * | 2022-08-17 | 2022-09-16 | 江苏盖亚环境科技股份有限公司 | Automatic change floating hydraulic clamping mechanism of gyration lifting formula |
| WO2023172143A1 (en) * | 2022-03-09 | 2023-09-14 | Audun Sjursaether | A wrench apparatus and a method for finalizing making up and initiating breaking out a threaded pipe connection |
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| US10718170B2 (en) | 2017-07-10 | 2020-07-21 | Vermeer Manufacturing Company | Vise arrangement for an underground drilling machine |
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