US20160273284A1 - Safety system for a clamping tool - Google Patents
Safety system for a clamping tool Download PDFInfo
- Publication number
- US20160273284A1 US20160273284A1 US15/034,166 US201415034166A US2016273284A1 US 20160273284 A1 US20160273284 A1 US 20160273284A1 US 201415034166 A US201415034166 A US 201415034166A US 2016273284 A1 US2016273284 A1 US 2016273284A1
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- United States
- Prior art keywords
- bore
- connecting element
- clamping tool
- safety system
- withholding
- 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.)
- Abandoned
Links
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- 238000007373 indentation Methods 0.000 description 5
- 230000009172 bursting Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
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- 230000000903 blocking effect Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
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- 241000587161 Gomphocarpus Species 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 239000011359 shock absorbing material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
Definitions
- the present invention relates to a safety system for a clamping tool suitable for clamping drill pipes and casings during drilling operations.
- said bore is a through bore extending through the body of the clamping tool.
- the elongated connecting element is extending through the bore and is coupled to the clamping tool body by means of withholding means.
- Said withholding means are arranged to couple the elongated connecting element to the clamping tool body at two different positions of the bore which are separated from each other, preferably with majority (at least 50%) of the clamping tool body in between them, so that the connecting element is withheld inside the bore.
- the withholding means are arranged to withhold the connecting means at two positions located at the respective two end portions of the bore.
- the end portions of the connecting element are positioned close to the respective orifice of the through bore so that the connecting element is kept in place by the withholding means at each of its respective end portions.
- the clamping tool would accidentally burst, e.g. during drilling operation, any loose parts of the tool are still kept together by the safety system/arrangement where the combination of withholding means and connecting element positioned in said bore provides a very strong safety connection.
- the connecting element is shielded inside the bore it will not eject or get thrown away in the unlikely event of breakage/unfastening of the withholding means.
- the through bore comprises two outer first portions (preferably one outer portion at each of its outer openings) having a first diameter and a middle second portion having a second diameter, where the first diameter is larger than the second diameter.
- the withholding means has a body which comprises at least one cross-section which is larger than the diameter of the middle second portion of the bore.
- said withholding means are positioned at each of the two outer first portions of the through bore in such a way that they are prevented from entering the middle second portion of the bore by means of positioning the cross-section which is larger than the diameter of the middle second portion of the bore in such a way that it stops the withholding means from entering the middle second portion of the bore.
- the system according to the invention comprises a shock absorbing component arranged adjacent to the withholding means.
- the shock absorbing component is arranged at the outer first portions of the bore, located in between the middle second portion of the bore and the withholding means.
- a shock absorption in case any loose parts of the clamping tool would move/get ejected as a consequence of sudden bursting/breaking.
- Such absorption of kinetic energy is advantageous for damage reduction if the clamping tool would break, and thus provides a further safety function of the system.
- Said shock absorbing component also protects the connecting element reducing the risk that the connecting element and/or the coupling between the withholding means and the connecting element would break.
- the object of increasing safety during making/breaking of joints between successive tubing elements can also be achieved by use of an energy absorbing arrangement comprising an elongated connecting element which at each end portion is coupled to a withholding means, and wherein a shock absorbing component is arranged adjacent to said withholding means at each end portion of the elongated connecting element.
- the shock absorbing component arranged together with the elongated element provides synergistic effects for improved security when used in a safety system for a gripping device: the elongated element provides a retaining function when coupled to the gripping device and the shock absorbing component in its turn reduces the risk that the couple between the elongated element and the gripping device break.
- the shock absorbing component and the elongated element leads to increased safety and to minimized risk that pieces of a broken gripping device would get ejected in case of breakage of gripping equipment.
- FIG. 1 illustrates a perspective view of an example of an implementation of an automatically adjustable gripper device gripping a pipe section
- FIG. 2 illustrates a perspective view of a clamping tool according to one embodiment of the invention
- FIG. 3A illustrates a side view of the clamping tool seen in FIG. 2 .
- FIG. 3B is a cross-sectional view of the clamping tool of FIG. 3A taken along line IIIB-IIIB,
- FIG. 3C is a detail view according to IIIC in FIG. 3B
- FIG. 4 illustrates a side view of a connecting element according to one embodiment of the invention
- FIG. 5 illustrates a side view of a withholding means according to one embodiment of the invention
- FIG. 6A illustrates a perspective, partially transparent, view of a cracked clamping tool according to one embodiment of the invention
- FIG. 6B illustrates a frontal view of the clamping tool seen in FIG. 6A .
- FIG. 7A illustrates a top view of the clamping tool seen in FIG. 6A .
- FIG. 7B is a cross-sectional view of the clamping tool of FIG. 7A , taken along line VIIB-VIIB.
- FIG. 1 there is shown in a schematic way a portion of a wrenching equipment 1 , herein also referred to as a “gripper” or “gripping device 1 ”, intended for making or breaking threaded joints between successive tubing/pipe elements (e.g. drill pipes).
- a wrenching equipment 1 herein also referred to as a “gripper” or “gripping device 1 ”, intended for making or breaking threaded joints between successive tubing/pipe elements (e.g. drill pipes).
- the gripping device 1 is arranged with two articulated gripping arms 101 embracing a pipe section 11 .
- the pipe 11 can be for example a drill pipe for a drill string or a borehole casing, and two grippers 1 can be used to grip two pipe section 11 to connect or disconnect successive pipes at complementary threads in the pipes.
- the gripper 1 according to the invention is suitable for use in conjunction with drilling in the ground or seabed for assembling and disassembling drill strings and borehole casings comprising a plurality of straight pipes connected end to end.
- the arrangement according to the invention is not necessarily limited to equipment for oil/gas industry but that the safety arrangement according to the invention may be used for any gripping device intended for connecting and/or disconnecting pipe sections.
- each arm 101 of said gripper 1 is equipped with a clamping tool 2 , herein also referred to as a “clamping jaw” or “holding device”.
- the clamping tool 2 comprises a body in the form of a casted item with a single solid body preferably made of metal.
- Each clamping tool 2 holds at least one releasably attached pipe contacting element 3 which is arranged to be brought into direct contact with the pipe section 11 during gripping of the pipe section for connection/disconnection operation as previously described.
- a pipe contacting element 3 is herein also referred to as a die.
- the pipe contacting elements 3 are preferably in direct contact with the pipe 11 .
- the gripping arms 101 are connected with an articulated joint 102 .
- the gripper 1 comprises a drive in the form of a hydraulic actuator (now shown).
- the gripper 1 can rotate one of the gripping arms 101 , in relation to the other gripping arm 101 , about the articulated joint 102 .
- the gripper 1 is adapted to move the gripping arms 101 in relation to each other so as to grip a pipe P, whereby the dies 3 are in contact with the pipe, or so as to release to the pipe.
- each clamping tool 2 holds two dies 3 .
- FIG. 2 shows a perspective view of a clamping tool 2 provided with a pair of dies 3 .
- the dies 3 have a surface presenting a curvature that is supposed to be identical to the curvature of the pipe 11 to be gripped.
- the gripper 1 is easily adapted to various sizes of pipe sections (pipes with different diameters) whereby connection/disconnection operations can be significantly improved.
- the curved surface of the dies 3 have, as can be seen in some of the following figures, small ridges to increase the friction or the grip between the dies and the pipe 11 .
- FIG. 2 the clamping tool 2 is seen from a perspective view, positioned substantially horizontally presenting a frontal pipe gripping portion 104 provided with a slightly curved surface whereat there are arranged said two dies 3 .
- the clamping tool body 2 comprises at least one bore 8 extending there through; in the appended figures the body of the clamping tool 2 comprises two horizontally extending through bores 8 , 8 ′. As seen in e.g. the cross section of FIG.
- an elongated connecting element 90 , 90 ′ extends through each bore 8 , 8 ′, and withholding means 92 , 92 ′ are coupled to the respective end portions 94 , 94 ′ of said connecting element 90 , 90 ′, in such a way that the connecting element 90 is withheld or secured inside the bore 8 , 8 ′.
- the withholding means 92 arranged at the end portions 94 , 94 ′ of the connecting element 90 couple the connecting element 90 to the clamping tool body 2 at two different positions of the bore 8 , wherein said positions are separated from each other by a certain distance.
- the term “couple” used for describing the function of the withholding means 92 , 92 ′ means “to fasten in relation to”, i.e. that the withholding means 92 , 92 ′ are arranged to fasten the connecting element 90 in relation to the clamping tool body 2 in such a way that the connecting element 90 cannot be removed from the tool body 2 unless either of the withholding means 92 , 92 ′ is removed.
- the respective positions whereat the withholding means 92 , 92 ′ couple the connecting means 90 , 90 ′ to the clamping tool body 2 are separated from each other by a substantial portion of the clamping tool body 2 , meaning that at least 50% of the clamping tool body 2 separates the coupling positions.
- a possible crack in the clamping tool body 2 will most likely develop in between said two coupling positions and thus in the event of breakage of the clamping tool body 2 any loose parts are still retained/held together by the connecting element.
- said bore 8 , 8 ′ is a through bore having a first 83 and a second 84 opening and extending through the solid body of the clamping tool 2 ,as is illustrated in the cross section in FIG. 3B .
- the reference numbers for said first 83 and second 84 openings are shown only for the uppermost through bore 8 , however the skilled person understands that also the lowermost bore 8 ′ comprises corresponding first and second openings.
- the bore 8 comprises two outer first portions 80 with a first diameter D. In between two outer portions 80 the bore 8 further comprises a middle second portion 82 with a second diameter d.
- the first diameter D is larger than the second diameter d and the outer portions 80 and the middle portion 82 of the bore 8 are connected by an flange 81 corresponding to the position of the bore whereat the diameter of the bore 8 is shifted.
- the first diameter D is between 10-20 mm, preferably between 13-17 mm
- the second diameter d is between 4-12 mm, preferably between 6-10 mm.
- the elongated connecting element 90 , 90 ′ may for instance be a bar or a wire or any other suitable element which provides the required material strength and shape.
- the connecting element 90 , 90 ′ is shown in the form of a solid bar having a circular cross section. The diameter of the bar is dimensioned to fit in the middle portion 82 of the bore. In one non-limiting example the bar 90 , 90 ′ has a diameter of 7 mm.
- the solid bar 90 , 90 ′ can be made of a high strength steel, such as a high strength low-alloy structural steel.
- the bar can be made of steel S355 (complying with European standard EN 10025) having a proof strength R p0.2 of at least 520 N/mm2 and a tensile strength between 630-950 N/mm2.
- Said withholding means 92 , 92 ′ are coupled to the respective end portions 94 , 94 ′ of the connecting element 90 , 90 ′.
- the withholding means 92 , 92 ′ may for instance be a securing component such as a nut, as is illustrated in the figures.
- a securing component 92 , 92 ′ provides advantages related to assembly of the system in that the connecting element may firstly be inserted into the bore 8 whereafter the securing component is attached to the respective end portion of the connecting element e.g. by screwing thereby locking the connecting means into position.
- the withholding means is not restricted to a nut component and many other types of components fulfilling the same function may be used, such as rivets, nail heads or any stopper or other securing element which can be coupled to the connecting element and lock/hold it in position inside the bore 8 , 8 ′.
- the withholding means 92 has a body comprising at least one cross-section X (see FIG. 3C ) which is larger than the diameter d of the middle second portion 82 of the bore 8 .
- one withholding means 92 is fitted in each of the two outer first portions 80 meaning that the withholding means are dimensioned to fit in the bore portions 80 having the diameter D.
- the withholding means 92 are arranged in such a way that their size prevents them from entering the middle portion 82 of the bore 8 .
- the withholding means in FIG. 3C is a nut with an outer diameter X.
- the diameter X is dimensioned so that the nut can be inserted into the first portion 80 of the bore 8 but is prevented from passing the flange 81 into the second portion 82 of the bore.
- the withholding means 92 is a nut and the connecting element is a bar
- the nuts may be coupled to the end portions 94 of the bar by means of screwing, in which case the nut and the bar are preferably arranged with complementary inner and outer threads.
- the withholding means 92 are arranged to couple the connecting element 90 to the clamping tool body 2 at two different positions of the bore 8 which are separated from each other. In one example this means that one withholding means 92 is coupled to each end portion 94 of the connecting element 90 at said outer first portions 80 of the bore 8 .
- the two positions whereat the respective withholding means 92 couple the elongated connecting element 90 to the clamping tool body 2 are separated by a substantial portion of the body of the clamping tool 2 , preferably a majority (>50%) of the body of the clamping tool 2 .
- One function of the nut 92 is to keep the connecting element 90 (i.e. the bar) in place inside the bore 8 , but at the same time the bar 90 also holds the nut 92 in position meaning the nut 90 and the bar 90 cooperate in keeping the safety arrangement 9 in place.
- FIG. 3A shows a side view of the clamping tool 2 with two horizontally extending connecting elements 90 , 90 ′ wherein each connecting element extends between bore openings 83 , 84 at the respective vertical side portions of the tool body 2 .
- the view in FIG. 3A shows one of the bore openings 84 .
- said two through bores 8 , 8 ′ are arranged at different positions through the body 2 having different alignments, both at different vertical locations and different horizontal locations, meaning that the clamping tool 2 is arranged with an uppermost 8 and a lowermost 8 ′ bore, as well as with a frontal 8 ′ and a rear 8 bore.
- the safety system further comprises at least one shock absorbing component 91 preferably arranged at one of the outer first portions 80 of the bore 8 and adjacent to the withholding means 92 .
- the safety system is arranged with one shock absorbing component 91 at each outer portion 80 of the bore 8 , for instance in FIG. 3B it is seen that two shock absorbing components 91 are provided for each through bore 8 : one at each outer portion 80 said through bore 8 .
- the shock absorbing component 91 is designed as a casing embracing at least a part of the portion of the connecting element 90 (i.e. the bar) located at said outer first bore portion 80 .
- the shock absorbing component 91 is dimensioned so that one end portion thereof abuts said flange 81 and another opposite end portion abuts the withholding means 92 leading to that the shock absorbing component 91 in one embodiment essentially fills the space which is defined by the outer first portion 80 , the flange 81 and the side of the withholding means 92 which is facing the inside of the bore 8 .
- the withholding means 92 is arranged/dimensioned so that, when the withholding means 92 is coupled to the elongated connecting element 90 and placed inside the bore 8 , a passage or opening 93 is created between the respective outer first portion 80 and the atmosphere outside the bore 8 at the outside of the clamping tool 2 .
- a passage 93 may be achieved in that the withholding means in the form of a nut 92 is arranged with an indentation 93 or in that the diameter of the nut is made smaller than the diameter of the outer first bore portion 80 so that an annular opening is created between the outer circumference of the nut 92 and the inner walls of the respective outer first bore portion 80 when the nut is in position inside the bore 8 .
- the function of the passage 93 will be described in more detail in connection to FIGS. 6A-6B .
- the shock absorbing component 91 is arranged to at least partially absorb the energy generated upon burst of the tool 2 .
- Such shock absorbing property may be achieved in many ways.
- the shock absorbing component can be made of a shock absorbing material such as for instance plastic, rubber, silicone, metal, ethyl cellulose based material or clay based material able to absorb and/or dampen shock upon impact.
- Another way of achieving a shock absorbing property is to provide a component having a certain shape/design such as e.g. a compression spring made of metal.
- the shock absorbing component is made of a deformable material.
- deformable herein may refer to the property of altering the shape upon impact, either reversibly or non-reversibly.
- a reversibly deformable material may for instance be compressible and/or elastic.
- a non-reversibly deformable material may for instance be pliable and/or foldable.
- the shock absorbing element 91 is made of an elastic material such as rubber which is able to be compressed upon impact thereby absorbing shock caused by bursting and subsequently retake its original shape.
- the shock absorbing component 91 is a deformable component made of a flexible modeling compound which can be non-reversibly deformed upon impact.
- the shock absorbing component 91 is made of a ethyl cellulose based material, sometimes also comprising mineral oil.
- the shock absorbing component 91 e.g. a casing, may be drop-forged from said ethyl cellulose material into a desired shape with desired dimensions, thus being given the shape i.e. of a casing.
- the shock absorbing component 91 may also be die-cast from melted ethyl cellulose material into casings. Such material is non-reversibly deformable upon impact.
- FIG. 4 shows a detailed view of an energy absorbing arrangement 9 according to one embodiment of the invention.
- the energy absorbing arrangement 9 is suitable for use in a safety system according to the invention.
- the energy absorbing arrangement 9 comprises an elongated connecting element 90 which at each end portion 94 is coupled to a withholding means 92 , and further a shock absorbing component 91 is arranged adjacent to each of said withholding means 92 at said respective end portions 94 of the connecting element.
- Each of the respective shock absorbing components 91 is arranged at the side of the corresponding withholding means 92 which is facing the other opposite end portion of the connecting element 90 .
- the embodiment shown in FIG. 4 comprises a connecting element in the form of a solid bar 90 , two withholding means in the form of nuts 92 and adjacent each nut 92 is arranged shock absorbing components in the form of deformable casings 91 .
- the casings 91 (shock absorbing components 91 ) are arranged in such a way that they at least partially embraces said solid bar.
- the casings 91 are intended to function as energy absorbing elements in case of breakage of a clamping tool 2 .
- Each end portion of the bar 90 is coupled to said withholding means 92 , herein shown as a nut 92 , which can be fastened to the bar 90 e.g. by means of screwing.
- FIG. 5 shows a planar view of an example of a withholding means 92 in the form of a nut providing a securing function.
- the nut has a body which comprises at least one cross-section X (herein corresponding to the largest diameter of the essentially circular nut) which is larger than the diameter d of said second portion 82 of the bore 8 .
- the nut comprises at least one indentation 93 which will later be described more thoroughly.
- the nut comprises two concave indentations 93 symmetrically arranged around the circumference of the nut 92 .
- FIGS. 6A-B and 7 A-B respectively which schematically illustrates a broken clamping tool 2 which has a crack 200 splitting the tool 2 into two loose portions.
- the crack 200 extends vertically through the clamping tool 2 resulting in that the body 2 is divided into a leftmost and a rightmost loose portion.
- shock absorbing component 91 will act as a shock/energy absorber during the burst and will efficiently dampen/absorb at least part of the kinetic energy generated during breakage.
- the presence of the shock absorbing components 91 , 91 ′ also leads to that the withholding elements 92 , 92 ′ and the connecting means 90 , 90 ′ are spared from at least a portion of the force generated during breakage of the tool 2 which further reduces the already very small risk that coupling between i.e. the nuts 92 and the bar 90 would also break.
- the shock absorbing component 91 is made of a casing in deformable material, for instance plastic based material. Bursting of a clamping tool 2 may lead to that loose parts will violently and suddenly split apart where said loose portions will move in high speed into different directions. This movement causes the shock absorbing component 91 , which is positioned at the outer bore portion 80 adjacent to the nut 92 , to be squeezed between said bore flange 81 and said nut 92 . When this occurs the shock absorbing component 91 is deformed thus absorbing kinetic energy generated at the burst.
- the withholding means 92 is arranged with a passage 93 connecting the outer bore portion 80 with the atmosphere outside of the clamping tool 2 .
- the function of said passage 93 is now to be further described.
- the shock absorbing component 91 is made of a deformable material.
- a passage 93 is created by symmetrically arranged indentations 93 in the nut 92 , seen in FIG. 5 , but other ways of creating a passage are of course also conceivable. Presence of such a passage 93 allows for a portion of the deformable shock absorbing component 91 to exit the bore 8 during breakage of the clamping tool 2 which contributes to the cushioning effect.
- FIG. 6B and FIG. 7B respectively there is illustrated a situation after breakage of the tool 2 where a portion of the shock absorbing component 91 , 91 ′ has exit the bore 8 due to squeezing during breakage.
- the shock absorbing component 91 is squeezed between the flange 81 and the nut 92 resulting in that a portion thereof will pass through the passage 93 between the nut 92 and the corresponding inner wall of the outer first bore portion 80 .
- the nut will stop a part of the material of the shock absorbing component 91 from exiting the bore, while the passage 93 will allow for a restricted portion to pass.
- Said passage 93 will hereby provide a choking effect and a shock absorbing effect is achieved which dampens the kinetic forces generated upon the burst.
- a passage 93 between the body of the withholding means 92 and the inner wall of the outer first bore portion 80 can be created in many ways, for instance as an annular passage between the outer circumference of a nut and the inner wall of said bore 8 .
- the mass or volume of the shock absorbing component 91 will affect the energy absorption which in its turn is dependent on the size/dimension of the outer first bore portion 80 whereat the shock absorbing component is arranged to be fitted.
- the mass and volume of the shock absorbing component 91 is balanced against the area of the passage 93 and the (blocking) area of the withholding means 92 .
- shock absorbing component 91 may affect the outline of the system. Increase viscosity of the material may require smaller passage and vice versa.
- the “area of the passage” is to be interpreted as the difference between the cross area of the opening of the outer first bore portion 80 and the area of the withholding means 92 arranged to block the bore hole opening 84 .
- the diameter of the bore hole opening 84 is 15 mm leading to a cross sectional area of around 177 mm2.
- the blocking area of the nut is around 122 mm2 and the total area of the passage 93 is thus around 55 mm2.
- the shock absorbing component 91 is made of an ethyl cellulose based material and has a essentially cylindrical shape with a diameter of 15 mm and a length of 20 mm resulting in a volume of around 3500 mm3.
- the energy absorbing property of the shock absorbing component 91 can be achieved in different ways and that it can be made of various materials as well as having various shapes.
- the shock absorbing component 91 may be an elastic casing made of rubber or silicone, or it may be a pliable, plastic based material which is injected into the bore 8 prior to/after fastening the nut 92 to the bar 90 .
- the connecting element can be a bar or a wire which is positioned inside a through bore or within a groove created on the outer surface of the tool.
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Abstract
-
- a clamping tool having a body,
- at least one bore through the body of the clamping tool,
- at least one elongated connecting element extending through the bore, and
- withholding means arranged to couple the connecting element to the clamping tool body at two different positions of the bore separated from each other.
The invention also relates to a corresponding safety arrangement for a gripping device.
Description
- The present invention relates to a safety system for a clamping tool suitable for clamping drill pipes and casings during drilling operations.
- In the construction of oil or gas wells wrench assemblies are often used for making or breaking threaded joints between successive tubing elements (drill pipes) that make-up the continuous tubing string extending through a well bore into the underground deposits. When making/breaking of pipe joints, extremely large forces (i.e. high torques) are involved, and accidental breakage of tools/components used during operation could seriously injure personnel and cause harm to expensive equipment.
- It is an object of the present invention to solve or at least minimise the above mentioned problem.
- This object is achieved essentially by means of a system as specified in appended claim 1. The object is also achieved by means of a safety arrangement according to the appended claims.
- It is understood that the herein presented advantages relates to both said system and arrangement, even when referring only to “safety system”.
- Thanks to the system according to the invention there is achieved at least the advantage that in case of accidental breaking and/or cracking of the clamping tool body during operational use, said connecting element will keep any loose parts together, preventing them from getting ejected causing damage to surrounding persons and/or equipment. Thus said system contributes to improved safety during drilling operations.
- Further advantageous embodiments of the system are specified in the dependent claims.
- According to one embodiment said bore is a through bore extending through the body of the clamping tool. In this embodiment the elongated connecting element is extending through the bore and is coupled to the clamping tool body by means of withholding means. Said withholding means are arranged to couple the elongated connecting element to the clamping tool body at two different positions of the bore which are separated from each other, preferably with majority (at least 50%) of the clamping tool body in between them, so that the connecting element is withheld inside the bore. Preferably the withholding means are arranged to withhold the connecting means at two positions located at the respective two end portions of the bore. Preferably, the end portions of the connecting element are positioned close to the respective orifice of the through bore so that the connecting element is kept in place by the withholding means at each of its respective end portions. This leads to a particularly strong and reliable construction where the risk of breakage of the connecting element and/or the withholding means is minimised. Thus, in case the clamping tool would accidentally burst, e.g. during drilling operation, any loose parts of the tool are still kept together by the safety system/arrangement where the combination of withholding means and connecting element positioned in said bore provides a very strong safety connection.
- Moreover, thanks to that the connecting element is shielded inside the bore it will not eject or get thrown away in the unlikely event of breakage/unfastening of the withholding means.
- According to another embodiment, the through bore comprises two outer first portions (preferably one outer portion at each of its outer openings) having a first diameter and a middle second portion having a second diameter, where the first diameter is larger than the second diameter. Further, the withholding means has a body which comprises at least one cross-section which is larger than the diameter of the middle second portion of the bore. Preferably, said withholding means are positioned at each of the two outer first portions of the through bore in such a way that they are prevented from entering the middle second portion of the bore by means of positioning the cross-section which is larger than the diameter of the middle second portion of the bore in such a way that it stops the withholding means from entering the middle second portion of the bore.
- According to yet another aspect the system according to the invention comprises a shock absorbing component arranged adjacent to the withholding means. Preferably the shock absorbing component is arranged at the outer first portions of the bore, located in between the middle second portion of the bore and the withholding means. Hereby there is provided a shock absorption in case any loose parts of the clamping tool would move/get ejected as a consequence of sudden bursting/breaking. Such absorption of kinetic energy is advantageous for damage reduction if the clamping tool would break, and thus provides a further safety function of the system. Said shock absorbing component also protects the connecting element reducing the risk that the connecting element and/or the coupling between the withholding means and the connecting element would break. Thus, in addition to the aspects previously presented, the object of increasing safety during making/breaking of joints between successive tubing elements can also be achieved by use of an energy absorbing arrangement comprising an elongated connecting element which at each end portion is coupled to a withholding means, and wherein a shock absorbing component is arranged adjacent to said withholding means at each end portion of the elongated connecting element. The shock absorbing component arranged together with the elongated element provides synergistic effects for improved security when used in a safety system for a gripping device: the elongated element provides a retaining function when coupled to the gripping device and the shock absorbing component in its turn reduces the risk that the couple between the elongated element and the gripping device break. Thus, when combined the shock absorbing component and the elongated element leads to increased safety and to minimized risk that pieces of a broken gripping device would get ejected in case of breakage of gripping equipment.
- The invention may be better understood by referring to the following figures. In the figures, like reference numerals designate corresponding parts throughout the different views.
-
FIG. 1 illustrates a perspective view of an example of an implementation of an automatically adjustable gripper device gripping a pipe section, -
FIG. 2 illustrates a perspective view of a clamping tool according to one embodiment of the invention, -
FIG. 3A illustrates a side view of the clamping tool seen inFIG. 2 , -
FIG. 3B is a cross-sectional view of the clamping tool ofFIG. 3A taken along line IIIB-IIIB, -
FIG. 3C is a detail view according to IIIC inFIG. 3B -
FIG. 4 illustrates a side view of a connecting element according to one embodiment of the invention, -
FIG. 5 illustrates a side view of a withholding means according to one embodiment of the invention, -
FIG. 6A illustrates a perspective, partially transparent, view of a cracked clamping tool according to one embodiment of the invention, -
FIG. 6B illustrates a frontal view of the clamping tool seen inFIG. 6A , -
FIG. 7A illustrates a top view of the clamping tool seen inFIG. 6A , and -
FIG. 7B is a cross-sectional view of the clamping tool ofFIG. 7A , taken along line VIIB-VIIB. - The foregoing aspects and many of the advantages of this invention will become better understood by means of the following detailed description, when taken in conjunction with the accompanying figures. Further, the description, and the examples contained therein, are provided for the purpose of describing and illustrating certain embodiments of the invention only and are not intended to limit the scope of the invention in any way.
- Referring firstly to
FIG. 1 there is shown in a schematic way a portion of a wrenching equipment 1, herein also referred to as a “gripper” or “gripping device 1”, intended for making or breaking threaded joints between successive tubing/pipe elements (e.g. drill pipes). - As shown in
FIG. 1 the gripping device 1 is arranged with two articulated grippingarms 101 embracing apipe section 11. Thepipe 11 can be for example a drill pipe for a drill string or a borehole casing, and two grippers 1 can be used to grip twopipe section 11 to connect or disconnect successive pipes at complementary threads in the pipes. - The gripper 1 according to the invention is suitable for use in conjunction with drilling in the ground or seabed for assembling and disassembling drill strings and borehole casings comprising a plurality of straight pipes connected end to end. However, it is to be understood that the arrangement according to the invention is not necessarily limited to equipment for oil/gas industry but that the safety arrangement according to the invention may be used for any gripping device intended for connecting and/or disconnecting pipe sections.
- As seen in
FIG. 1 eacharm 101 of said gripper 1 is equipped with aclamping tool 2, herein also referred to as a “clamping jaw” or “holding device”. Preferably theclamping tool 2 comprises a body in the form of a casted item with a single solid body preferably made of metal. Eachclamping tool 2 holds at least one releasably attachedpipe contacting element 3 which is arranged to be brought into direct contact with thepipe section 11 during gripping of the pipe section for connection/disconnection operation as previously described. Apipe contacting element 3 is herein also referred to as a die. When the gripper 1 grips apipe 11, thepipe contacting elements 3 are preferably in direct contact with thepipe 11. - The gripping
arms 101 are connected with an articulated joint 102. Preferably the gripper 1 comprises a drive in the form of a hydraulic actuator (now shown). By means of the hydraulic actuator, the gripper 1 can rotate one of the grippingarms 101, in relation to the othergripping arm 101, about the articulated joint 102. Thereby, the gripper 1 is adapted to move the grippingarms 101 in relation to each other so as to grip a pipe P, whereby the dies 3 are in contact with the pipe, or so as to release to the pipe. - In
FIG. 1 eachclamping tool 2 holds two dies 3. This is seen more clearly for example inFIG. 2 , which shows a perspective view of aclamping tool 2 provided with a pair of dies 3. Herein is also seen that the dies 3 have a surface presenting a curvature that is supposed to be identical to the curvature of thepipe 11 to be gripped. By switching between dies 3 having different dimensions/curvatures the gripper 1 is easily adapted to various sizes of pipe sections (pipes with different diameters) whereby connection/disconnection operations can be significantly improved. The curved surface of the dies 3 have, as can be seen in some of the following figures, small ridges to increase the friction or the grip between the dies and thepipe 11. - Using a
die 3 having a dimension that does not match with the diameter of thepipe 11 to be gripped would lead to mechanical strain in the body of theclamping tool 2 holding the dies 3, and in the worse case scenario eventually lead to breakage of saidclamping tool 2. Due to the large forces and high torques involved in wrenching thepipes 11, breakage of any components can be both very dangerous and risk damage other parts of the system, for instance in case loose parts would get ejected, hitting persons or materials, or if parts of theclamping tool 2 would break loose and fall into the well bore. - For this reason a safety system and a
corresponding safety arrangement 9 is provided. - The safety system according to one embodiment of the invention will now be further described, referring mainly to
FIGS. 2, 3A, 3B and 3C . InFIG. 2 theclamping tool 2 is seen from a perspective view, positioned substantially horizontally presenting a frontalpipe gripping portion 104 provided with a slightly curved surface whereat there are arranged said two dies 3. Theclamping tool body 2 comprises at least onebore 8 extending there through; in the appended figures the body of theclamping tool 2 comprises two horizontally extending throughbores FIG. 3B an elongated connectingelement bore respective end portions element element 90 is withheld or secured inside thebore end portions element 90 couple the connectingelement 90 to theclamping tool body 2 at two different positions of thebore 8, wherein said positions are separated from each other by a certain distance. In this context, the term “couple” used for describing the function of the withholding means 92, 92′ means “to fasten in relation to”, i.e. that the withholding means 92, 92′ are arranged to fasten the connectingelement 90 in relation to theclamping tool body 2 in such a way that the connectingelement 90 cannot be removed from thetool body 2 unless either of the withholding means 92, 92′ is removed. As seen inFIG. 3B the respective positions whereat the withholding means 92, 92′ couple the connectingmeans clamping tool body 2 are separated from each other by a substantial portion of theclamping tool body 2, meaning that at least 50% of theclamping tool body 2 separates the coupling positions. A possible crack in theclamping tool body 2 will most likely develop in between said two coupling positions and thus in the event of breakage of theclamping tool body 2 any loose parts are still retained/held together by the connecting element. - In one embodiment said
bore clamping tool 2,as is illustrated in the cross section inFIG. 3B . The reference numbers for said first 83 and second 84 openings are shown only for the uppermost throughbore 8, however the skilled person understands that also thelowermost bore 8′ comprises corresponding first and second openings. At each of the first 83 and second 84 openings thebore 8 comprises two outerfirst portions 80 with a first diameter D. In between twoouter portions 80 thebore 8 further comprises a middlesecond portion 82 with a second diameter d. The first diameter D is larger than the second diameter d and theouter portions 80 and themiddle portion 82 of thebore 8 are connected by anflange 81 corresponding to the position of the bore whereat the diameter of thebore 8 is shifted. As a non-limiting example the first diameter D is between 10-20 mm, preferably between 13-17 mm, and the second diameter d is between 4-12 mm, preferably between 6-10 mm. - The elongated connecting
element element middle portion 82 of the bore. In one non-limiting example thebar - As a non-limiting example the
solid bar - Said withholding means 92, 92′ are coupled to the
respective end portions element component bore 8 whereafter the securing component is attached to the respective end portion of the connecting element e.g. by screwing thereby locking the connecting means into position. However the withholding means is not restricted to a nut component and many other types of components fulfilling the same function may be used, such as rivets, nail heads or any stopper or other securing element which can be coupled to the connecting element and lock/hold it in position inside thebore FIG. 3C ) which is larger than the diameter d of the middlesecond portion 82 of thebore 8. In one embodiment one withholding means 92 is fitted in each of the two outerfirst portions 80 meaning that the withholding means are dimensioned to fit in thebore portions 80 having the diameter D. Moreover, the withholding means 92 are arranged in such a way that their size prevents them from entering themiddle portion 82 of thebore 8. In one example the withholding means inFIG. 3C is a nut with an outer diameter X. The diameter X is dimensioned so that the nut can be inserted into thefirst portion 80 of thebore 8 but is prevented from passing theflange 81 into thesecond portion 82 of the bore. Thus by coupling onenut 92 to eachend portion 94 of the corresponding connectingelement 90 the connectingelement 90 is secured inside the throughbore 8, and thereby the withholding means 92, 92′ couple the connecting element to theclamping tool body 2. The withholding means 92 can be coupled to the connectingelement 90 in various ways. For instance in the embodiment where the withholding means 92 is a nut and the connecting element is a bar, the nuts may be coupled to theend portions 94 of the bar by means of screwing, in which case the nut and the bar are preferably arranged with complementary inner and outer threads. However, the skilled person understands that other ways of coupling the withholding means 92 to the connectingelement 90 are also conceivable, i.e. such as welding. The withholding means 92 are arranged to couple the connectingelement 90 to theclamping tool body 2 at two different positions of thebore 8 which are separated from each other. In one example this means that one withholding means 92 is coupled to eachend portion 94 of the connectingelement 90 at said outerfirst portions 80 of thebore 8. In this example the two positions whereat the respective withholding means 92 couple the elongated connectingelement 90 to theclamping tool body 2 are separated by a substantial portion of the body of theclamping tool 2, preferably a majority (>50%) of the body of theclamping tool 2. - One function of the
nut 92 is to keep the connecting element 90 (i.e. the bar) in place inside thebore 8, but at the same time thebar 90 also holds thenut 92 in position meaning thenut 90 and thebar 90 cooperate in keeping thesafety arrangement 9 in place. -
FIG. 3A shows a side view of theclamping tool 2 with two horizontally extending connectingelements bore openings tool body 2. The view inFIG. 3A shows one of thebore openings 84. Herein it is seen that said two throughbores body 2 having different alignments, both at different vertical locations and different horizontal locations, meaning that theclamping tool 2 is arranged with an uppermost 8 and a lowermost 8′ bore, as well as with a frontal 8′ and a rear 8 bore. Like positioning of thebores element clamping tool 2 in case of cracking of thetool body 2. However, it is evident that sometimes only one throughbore 8 and safety arrangement may be sufficient. - The safety system according to one embodiment of the invention further comprises at least one
shock absorbing component 91 preferably arranged at one of the outerfirst portions 80 of thebore 8 and adjacent to the withholding means 92. Preferably the safety system is arranged with oneshock absorbing component 91 at eachouter portion 80 of thebore 8, for instance inFIG. 3B it is seen that twoshock absorbing components 91 are provided for each through bore 8: one at eachouter portion 80 said throughbore 8. - The position of the
shock absorbing component 91 is shown in the enlarged cross section ofFIG. 3C . In a preferred aspect of the invention theshock absorbing component 91 is designed as a casing embracing at least a part of the portion of the connecting element 90 (i.e. the bar) located at said outerfirst bore portion 80. Preferably theshock absorbing component 91 is dimensioned so that one end portion thereof abuts saidflange 81 and another opposite end portion abuts the withholding means 92 leading to that theshock absorbing component 91 in one embodiment essentially fills the space which is defined by the outerfirst portion 80, theflange 81 and the side of the withholding means 92 which is facing the inside of thebore 8. In a preferred embodiment the withholding means 92 is arranged/dimensioned so that, when the withholding means 92 is coupled to the elongated connectingelement 90 and placed inside thebore 8, a passage oropening 93 is created between the respective outerfirst portion 80 and the atmosphere outside thebore 8 at the outside of theclamping tool 2. Such apassage 93 may be achieved in that the withholding means in the form of anut 92 is arranged with anindentation 93 or in that the diameter of the nut is made smaller than the diameter of the outerfirst bore portion 80 so that an annular opening is created between the outer circumference of thenut 92 and the inner walls of the respective outerfirst bore portion 80 when the nut is in position inside thebore 8. The function of thepassage 93 will be described in more detail in connection toFIGS. 6A-6B . - The
shock absorbing component 91 is arranged to at least partially absorb the energy generated upon burst of thetool 2. Such shock absorbing property may be achieved in many ways. For instance the shock absorbing component can be made of a shock absorbing material such as for instance plastic, rubber, silicone, metal, ethyl cellulose based material or clay based material able to absorb and/or dampen shock upon impact. Another way of achieving a shock absorbing property is to provide a component having a certain shape/design such as e.g. a compression spring made of metal. - In one embodiment the shock absorbing component is made of a deformable material. It is to be understood that “deformable” herein may refer to the property of altering the shape upon impact, either reversibly or non-reversibly. A reversibly deformable material may for instance be compressible and/or elastic. A non-reversibly deformable material may for instance be pliable and/or foldable.
- As an example the
shock absorbing element 91 is made of an elastic material such as rubber which is able to be compressed upon impact thereby absorbing shock caused by bursting and subsequently retake its original shape. - As another example the
shock absorbing component 91 is a deformable component made of a flexible modeling compound which can be non-reversibly deformed upon impact. - As yet another example the
shock absorbing component 91 is made of a ethyl cellulose based material, sometimes also comprising mineral oil. Theshock absorbing component 91, e.g. a casing, may be drop-forged from said ethyl cellulose material into a desired shape with desired dimensions, thus being given the shape i.e. of a casing. Theshock absorbing component 91 may also be die-cast from melted ethyl cellulose material into casings. Such material is non-reversibly deformable upon impact. -
FIG. 4 shows a detailed view of anenergy absorbing arrangement 9 according to one embodiment of the invention. Theenergy absorbing arrangement 9 is suitable for use in a safety system according to the invention. Theenergy absorbing arrangement 9 comprises an elongated connectingelement 90 which at eachend portion 94 is coupled to a withholding means 92, and further ashock absorbing component 91 is arranged adjacent to each of said withholding means 92 at saidrespective end portions 94 of the connecting element. Each of the respectiveshock absorbing components 91 is arranged at the side of the corresponding withholding means 92 which is facing the other opposite end portion of the connectingelement 90. The embodiment shown inFIG. 4 comprises a connecting element in the form of asolid bar 90, two withholding means in the form ofnuts 92 and adjacent eachnut 92 is arranged shock absorbing components in the form ofdeformable casings 91. - The casings 91 (shock absorbing components 91) are arranged in such a way that they at least partially embraces said solid bar. The
casings 91 are intended to function as energy absorbing elements in case of breakage of aclamping tool 2. Each end portion of thebar 90 is coupled to said withholding means 92, herein shown as anut 92, which can be fastened to thebar 90 e.g. by means of screwing. -
FIG. 5 shows a planar view of an example of a withholding means 92 in the form of a nut providing a securing function. The nut has a body which comprises at least one cross-section X (herein corresponding to the largest diameter of the essentially circular nut) which is larger than the diameter d of saidsecond portion 82 of thebore 8. The nut comprises at least oneindentation 93 which will later be described more thoroughly. InFIG. 5 the nut comprises twoconcave indentations 93 symmetrically arranged around the circumference of thenut 92. When thenut 92 is coupled to an end portion of thebar 90 and the bar is positioned inside the throughbore 8 saidindentation 93 creates an opening or a passage between theouter bore portion 80 and the outside of thetool 2. - The function of the safety system, as well as of the corresponding safety arrangement, will now be described in more detail, referring mainly to
FIGS. 6A-B and 7A-B respectively which schematically illustrates abroken clamping tool 2 which has acrack 200 splitting thetool 2 into two loose portions. Herein thecrack 200 extends vertically through theclamping tool 2 resulting in that thebody 2 is divided into a leftmost and a rightmost loose portion. - When a
clamping tool 2 is subjected to mechanical stress, e.g. as a consequence of gripping apipe 11 with a diameter that does not match the curvature of the dies 3 used for gripping, it may happen that the body of thetool 2 cracks apart. At the point when cracking/breaking occurs there is a risk that thetool 2 will burst apart suddenly and violently. Thanks to the safety system and safety arrangement retaining the resulting loose portions, a situation where parts of theclamping tool 2 are ejected into different directions and potentially would cause damage to surrounding individuals and/or equipment is prevented. The connecting element/s clamping tool 2. Furthermore, theshock absorbing component 91 will act as a shock/energy absorber during the burst and will efficiently dampen/absorb at least part of the kinetic energy generated during breakage. The presence of theshock absorbing components withholding elements means tool 2 which further reduces the already very small risk that coupling between i.e. the nuts 92 and thebar 90 would also break. - The shock absorbing function of the
shock absorbing element 91 is now to be further described. In one embodiment theshock absorbing component 91 is made of a casing in deformable material, for instance plastic based material. Bursting of aclamping tool 2 may lead to that loose parts will violently and suddenly split apart where said loose portions will move in high speed into different directions. This movement causes theshock absorbing component 91, which is positioned at theouter bore portion 80 adjacent to thenut 92, to be squeezed between saidbore flange 81 and saidnut 92. When this occurs theshock absorbing component 91 is deformed thus absorbing kinetic energy generated at the burst. - In one embodiment the withholding means 92 is arranged with a
passage 93 connecting theouter bore portion 80 with the atmosphere outside of theclamping tool 2. The function of saidpassage 93 is now to be further described. - In the following example the
shock absorbing component 91 is made of a deformable material. One example of apassage 93 is created by symmetrically arrangedindentations 93 in thenut 92, seen inFIG. 5 , but other ways of creating a passage are of course also conceivable. Presence of such apassage 93 allows for a portion of the deformableshock absorbing component 91 to exit thebore 8 during breakage of theclamping tool 2 which contributes to the cushioning effect. For example inFIG. 6B andFIG. 7B respectively there is illustrated a situation after breakage of thetool 2 where a portion of theshock absorbing component bore 8 due to squeezing during breakage. - At bursting of the
clamping tool 2 theshock absorbing component 91 is squeezed between theflange 81 and thenut 92 resulting in that a portion thereof will pass through thepassage 93 between thenut 92 and the corresponding inner wall of the outerfirst bore portion 80. In other words, the nut will stop a part of the material of theshock absorbing component 91 from exiting the bore, while thepassage 93 will allow for a restricted portion to pass. Saidpassage 93 will hereby provide a choking effect and a shock absorbing effect is achieved which dampens the kinetic forces generated upon the burst. - As is previously described a
passage 93 between the body of the withholding means 92 and the inner wall of the outerfirst bore portion 80 can be created in many ways, for instance as an annular passage between the outer circumference of a nut and the inner wall of saidbore 8. - Altering the area of the
passage 93 in relation to the area of the withholding means 92 will also alter the choking effect and also the shock absorption, i.e. the energy absorption. Also the mass or volume of theshock absorbing component 91 will affect the energy absorption which in its turn is dependent on the size/dimension of the outerfirst bore portion 80 whereat the shock absorbing component is arranged to be fitted. Thus, when adapting the system for being able to provide a certain dampening, the mass and volume of theshock absorbing component 91 is balanced against the area of thepassage 93 and the (blocking) area of the withholding means 92. - Also the physical properties of the
shock absorbing component 91 may affect the outline of the system. Increase viscosity of the material may require smaller passage and vice versa. - The “area of the passage” is to be interpreted as the difference between the cross area of the opening of the outer
first bore portion 80 and the area of the withholding means 92 arranged to block thebore hole opening 84. - As one non-limiting example of dimensions the diameter of the
bore hole opening 84 is 15 mm leading to a cross sectional area of around 177 mm2. The blocking area of the nut is around 122 mm2 and the total area of thepassage 93 is thus around 55 mm2. Theshock absorbing component 91 is made of an ethyl cellulose based material and has a essentially cylindrical shape with a diameter of 15 mm and a length of 20 mm resulting in a volume of around 3500 mm3. - The skilled person understands that the energy absorbing property of the
shock absorbing component 91 can be achieved in different ways and that it can be made of various materials as well as having various shapes. For instance theshock absorbing component 91 may be an elastic casing made of rubber or silicone, or it may be a pliable, plastic based material which is injected into thebore 8 prior to/after fastening thenut 92 to thebar 90. - It is understood that the objects of the present invention set forth above, among those made apparent by the detailed description, shall be interpreted as illustrative and not in a limiting sense. Within the scope of the following claims the set-up of various alterations of the present invention may be possible.
- For instance the connecting element can be a bar or a wire which is positioned inside a through bore or within a groove created on the outer surface of the tool.
Claims (13)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1351304-9 | 2013-11-04 | ||
SE1351304 | 2013-11-04 | ||
PCT/EP2014/073660 WO2015063316A2 (en) | 2013-11-04 | 2014-11-04 | Safety system for a clamping tool |
Publications (1)
Publication Number | Publication Date |
---|---|
US20160273284A1 true US20160273284A1 (en) | 2016-09-22 |
Family
ID=51900393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/034,166 Abandoned US20160273284A1 (en) | 2013-11-04 | 2014-11-04 | Safety system for a clamping tool |
Country Status (4)
Country | Link |
---|---|
US (1) | US20160273284A1 (en) |
EP (1) | EP3066291B1 (en) |
NO (1) | NO3066291T3 (en) |
WO (1) | WO2015063316A2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4409866A (en) * | 1981-12-28 | 1983-10-18 | Mcbride Joan | Tool handle with contoured through passageway and spring biased trigger |
US5832794A (en) * | 1997-04-08 | 1998-11-10 | Fowler; Elbert J. | Extension handle apparatus for wrenches |
US6199456B1 (en) * | 1999-10-12 | 2001-03-13 | Todd H. Hlady | Apparatus for holding and manipulating tools |
US6308596B1 (en) * | 1998-07-15 | 2001-10-30 | Elden Williams | Hand wrench torque enhancing device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093496A (en) * | 1913-06-24 | 1914-04-14 | Robinson L Stringfellow | Pipe-wrench. |
FR1421459A (en) * | 1964-10-29 | 1965-12-17 | Nouveautes Mecaniques Electr N | Composite sealing washers |
KR200188542Y1 (en) * | 2000-01-24 | 2000-07-15 | 동아공업주식회사 | Shock absorbing washer |
DK2129863T3 (en) * | 2007-02-23 | 2012-07-23 | Frank S Inr Inc | Method and apparatus for forming tubular connections |
-
2014
- 2014-11-04 US US15/034,166 patent/US20160273284A1/en not_active Abandoned
- 2014-11-04 NO NO14798740A patent/NO3066291T3/no unknown
- 2014-11-04 EP EP14798740.8A patent/EP3066291B1/en active Active
- 2014-11-04 WO PCT/EP2014/073660 patent/WO2015063316A2/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4409866A (en) * | 1981-12-28 | 1983-10-18 | Mcbride Joan | Tool handle with contoured through passageway and spring biased trigger |
US5832794A (en) * | 1997-04-08 | 1998-11-10 | Fowler; Elbert J. | Extension handle apparatus for wrenches |
US6308596B1 (en) * | 1998-07-15 | 2001-10-30 | Elden Williams | Hand wrench torque enhancing device |
US6199456B1 (en) * | 1999-10-12 | 2001-03-13 | Todd H. Hlady | Apparatus for holding and manipulating tools |
Also Published As
Publication number | Publication date |
---|---|
EP3066291B1 (en) | 2018-02-14 |
EP3066291A2 (en) | 2016-09-14 |
WO2015063316A2 (en) | 2015-05-07 |
WO2015063316A3 (en) | 2015-06-25 |
NO3066291T3 (en) | 2018-07-14 |
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