EP0962742B1 - Dispositif de découpe de pièces non metalliques au moyen d'un tube à expansion pyrotechnique - Google Patents
Dispositif de découpe de pièces non metalliques au moyen d'un tube à expansion pyrotechnique Download PDFInfo
- Publication number
- EP0962742B1 EP0962742B1 EP99401321A EP99401321A EP0962742B1 EP 0962742 B1 EP0962742 B1 EP 0962742B1 EP 99401321 A EP99401321 A EP 99401321A EP 99401321 A EP99401321 A EP 99401321A EP 0962742 B1 EP0962742 B1 EP 0962742B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- parts
- cut
- cutting
- spacer
- pyrotechnic
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
- F42B15/36—Means for interconnecting rocket-motor and body section; Multi-stage connectors; Disconnecting means
- F42B15/38—Ring-shaped explosive elements for the separation of rocket parts
Definitions
- the invention relates to a cutting device using a pyrotechnic expansion tube for cut at least one piece, along a cutting line given.
- Such a device can in particular be used in the aeronautics and space industries, for order in a very short time the separation of two structural elements, while ensuring transmission sometimes significant efforts between these two elements, before cutting is done.
- pyrotechnic expansion tube designates a waterproof and deformable metal tube, in which walks a detonating cord.
- Soft material such as silicone rubber is interposed between the detonating cord and envelope.
- the envelope Before firing, the envelope has an oblong section, for example shaped like an ellipse or flattened circle.
- the shock wave which propagates at very high speed the along the tube distorts the envelope and tends to give it a substantially circular section.
- a cutting device pyrotechnic including an expansion tube pyrotechnic is used to cut pieces metal.
- it is mounted in a space formed between two metal parts or between two parts of the same metal part.
- the room (s) to cut are pre-machined, so that present an area of reduced thickness according to each desired cutting line. Expansion of the envelope caused by the firing of the detonating cord translated by cutting the part (s) according to the cutting line corresponding to the machined area.
- Cutting devices of one or two pieces metallic by means of an expansion tube are described in particular in the documents US-A-3 486 410, US-A-3 453 960, US-A-3 698 281, FR-A-2 598,796 and EP-A-0 273 061.
- the structural elements used in the aeronautics and space industries are made of more and more frequently in materials not metal.
- the materials used are often composite materials, i.e. materials formed from long fibers arranged in layers superimposed according to preferential orientations, embedded in a resin matrix.
- the machining of a zone of less thickness in a non-metallic material, and especially in a composite material, currently essential to locate and limit cutting produced by the pyrotechnic expansion tube, is not acceptable in non-metallic material, especially of the composite type. Indeed, such machining would unacceptably diminish the mechanical characteristics of the part before its cutting, by cutting the long fibers which provide these characteristics.
- the cutting of a non-material metallic, in particular of the composite type, by means of a cutting device may cause significant environmental pollution as well as significant reduction in the mechanical characteristics of adjoining structures. This decrease would in particular for the origin of the so-called phenomena of "delamination", that is to say a separation of the layers of fibers near the cutting line.
- the subject of the invention is precisely a pyrotechnic cutting device, allowing cut non-metallic parts directly, and in particular parts made of composite material, by means a pyrotechnic expansion tube, preserving the mechanical properties of these parts before and after their cutting, and limiting the pollution generated during the cut.
- a cutting device pyrotechnic including an expansion tube pyrotechnic mounted in a space between two parts and delimited by at least one spacer connecting these two pieces, so as to cut at least one of the pieces along at least one cutting line when the tube is used, characterized in that each piece to be cut is made of non-metallic material, a buttress being fixed thereon, opposite and in face of the spacer, so that an edge of the buttress extends along the cutting line.
- a relatively cut clean and well located is thus ensured, without machining of parts.
- the mechanical strength of parts before cutting is not called into question.
- the sharpness of the cut preserves the integrity of parts after cutting and severely limits the pollution.
- the device according to the invention allows to significantly lighten the assemblies not metal which must be cut with a pyrotechnic expansion tube.
- the device according to the invention allows to significantly reduce the shock generated during cutting, compared to that which is generated when cutting parts metal.
- each buttress is substantially dimensionally stable.
- each buttress is made of a deformable material.
- a holding member made of a material deformable is preferably attached to each part to cut, opposite and opposite the expansion tube pyrotechnic.
- the holding member then comprises a edge which extends along the cutting line and extends away from this edge.
- these two members can be made of the same material as the part to be cut and this material is advantageously a composite material formed from long fiber layers embedded in a resin matrix. The whole is then made directly by draping, during manufacturing of the room.
- the parts and the spacer can be made of the same material not metallic, in monolithic form.
- the pyrotechnic expansion tube is then integrated into the assembly during the manufacture of the parts.
- the spacer can be fixed between the parts by fixing means such as bolts passing through them.
- the other room is a substantially non-deformable support piece, connected to the part to be cut by one or two spacers.
- the space in which is housed the pyrotechnic expansion tube is delimited by two spacers and a buttress is placed on each pieces to be cut, opposite a first of spacers.
- the two parts form then the skins of a first sandwich structure including a soul
- the two buttresses form the skins of a second sandwich structure, including also a soul.
- Terminal parts of parts forming the skins of the first sandwich structure then enter the second sandwich structure, between the buttresses and the second spacer.
- the second spacer is fixed between the pieces in a preferred location away from the pyrotechnic expansion tube.
- the reference 10 designates a part made of a non-metallic material, as desired cut along a cutting line 12.
- the material not metal in which the part 10 is formed can be of different natures, without departing from the framework of the invention.
- a preferred application is for the case where this material is a composite material, formed of long fiber layers embedded in a matrix of resin.
- such parts can be obtained by draping resin-impregnated fiber sheets thermosetting, then polymerization of the resin.
- the part 10 to be cut can be of various forms, without departing from the framework of the invention.
- the part 10 is in the form of a plate of substantially uniform thickness. This plate can be flat, curved, or have any other shape suitable for the intended application.
- the cutting device according to the invention is generally designated by reference 14.
- This cutting device comprises in this case a tube 16 with pyrotechnic expansion, a support piece 18 and a spacer 20 (these two last pieces can be separated, or made in one piece, as shown).
- the pyrotechnic expansion tube 16 is performed in the same way as in the devices applied to the cutting of metal parts. However, it has a reduced dimension adapted the nature of the material constituting the part 10 to cut, so as to generate a shock wave significantly less than in the cutting of metal parts. A description detail of the pyrotechnic expansion tube 16 is not therefore not necessary.
- the expansion tube 16 pyrotechnic includes a metal casing 22 waterproof and deformable, a detonating cord 24 housed at inside the envelope 22, as well as a material flexible 26 interposed between the detonating cord 24 and the envelope 22.
- the flexible material 26 has in particular for function to center the detonating cord inside of the envelope. As an example, it can be carried out made of silicone rubber.
- the envelope 22 Before firing, the envelope 22 has an oblong section, by example in the shape of a flattened circle or oval, like illustrated in Figure 1.
- the pyrotechnic expansion tube 16 is received in a space 28 formed between the part 10 to be cut and the support piece 18, this space 28 being delimited by a side by a face 21 of the spacer 20. More specifically, the longer section of the envelope 22 is oriented parallel to the direction defined by the part 10 to be cut.
- the support piece 18 and the spacer 20 form a single part, distinct from part 10 to cut.
- This unique piece is fixed on the piece to cut by fastening means such as bolts (not shown) whose location is illustrated schematically by the dashed line 30.
- the nature and thickness of the materials constituting the support piece 18 and the spacer 20 are such that these two pieces are practically undeformable during the implementation of the tube 16 to pyrotechnic expansion. This result is obtained either in using non-deformable thickness materials limited, such as metals, either by using relatively soft but stronger materials thickness, such as non-metallic materials, as illustrated in Figure 1. In the latter case, it should be noted that as a variant, the support piece 18 as well as the spacer 20 can be made of a in one piece with piece 10 to be cut. The means of fixing such that the bolts 30 are no longer required.
- the face of the support piece 18 facing part 10 to be cut constitutes a substantially non-deformable surface, generally parallel to part 10 and on which the tube 16 with pyrotechnic expansion, when fire of the detonating cord 24. Consequently, the expansion of the envelope 22 is carried out entirely in the direction of part 10 to be cut.
- the face 21 of the spacer 20 facing space 28 is aligned with the line of cutout 12 of part 10.
- the thickness of the tube 16 to pyrotechnic expansion is substantially equal to the clearance mounting, at the width of the space 28, between the part 10 to be cut and the supporting part 18.
- One element (not shown) can be attached to the part support 18, or formed directly on this part so to close the space 28 opposite the spacer 20, if this is necessary to prevent the escape of the tube 16.
- a buttress 40 is fixed on the part 10 to be cut, opposite the spacer 20 and opposite to it.
- This buttress 40 is in the form of a plate one edge 42 of which extends along the cutting line 12 of Exhibit 10.
- the buttress 40 is substantially dimensionally stable.
- the undeformable nature of the buttress can be obtained either by using a material not relatively thick metal, as shown, either using lesser metallic material thickness.
- the fixing means (not shown) including the location is illustrated by the dashed line 30 provide effective support of the buttress 40 against the part 10, near the cutting line 12.
- the presence of the buttress 40 ensures localized and precise cutting, acting on the way of an anvil on which the piece rests 10 to cut.
- the resulting shock wave causes the expansion of the envelope 22, which tends to take a section substantially circular. Since tube 16 to pyrotechnic expansion is supported on a part 18 substantially undeformable, its expansion occurs essentially in the direction of the part 10 to be cut. It is therefore applied entirely to part 10. Since it is supported on the buttress 40 in its part located opposite the spacer 20, the expansion of the tube 16 therefore has the effect of cutting the piece 10 precisely, along the line of cutout 12 defined previously.
- FIG. 2 a variant is shown of the first embodiment of the invention which has just been described with reference to FIG. 1.
- This variant relates to the case where the pyrotechnic cutting 14 is used to cut simultaneously two pieces 10, substantially parallel to each other, delimiting between them a space 28.
- the space 28 is closed, opposite to the spacer 20, for example by a second spacer 36.
- the spacer 36 is fixed to the parts 10 by fixing means such as bolts (not shown), the location of which is illustrated schematically by the dashed line 38 in FIG. 2.
- the spacer 36 can be done in one piece with both parts 10 or replaced by the direct junction of these two rooms, then joined to each other.
- a buttress 40 is fixed on the outer face of each of the parts 10, opposite the spacer 20. More specifically, an edge 42 of each of the buttresses 40 is aligned with the cutting line 12 provided in each of the pieces 10 and, therefore, with the face 21 of the spacer 20, facing the space 28.
- the location of the cut along the cut lines 12 is all the more efficient than the parts of parts 10 which are in contact with the pyrotechnic expansion tube 16 flex easily outward when pivoting around their anchor point schematically by dashed lines 38 in FIG. 2.
- the fixing parts 10 on spacer 36 must be as far away as possible from the tube 16 and the lines of cutout 12 provided in the parts.
- the buttresses 40 are substantially non-deformable, as in the embodiment described above in se referring to figure 1.
- FIG 3 there is shown schematically a second embodiment of a pyrotechnic cutting device 14 in accordance with the invention.
- the Figure 3 illustrates the simplest case where cutting relates to a single room 10. The general arrangement is therefore comparable to that described above with reference to Figure 1, so that a detailed description of the various parts which in this case constitute the cutting device 14 is not necessary.
- a first difference lies in the fact that instead of being substantially non-deformable, the buttress 40 is deformable and produced in a material preferably identical or very close to the non-metallic material in which the piece 10 to be cut.
- the buttress 40 can be obtained by draping additional layers fibers impregnated with thermosetting resin. The buttress is then linked to part 10 over its entire surface adjacent to it, during the manufacture of the room.
- the orientation of the fibers in the buttress 40 may be significantly different from that of the fibers located in part 10, to hold account of the specific function of the buttress 40.
- the fibers placed in the buttress 40 are advantageously intertwined to ensure recovery radial forces applied to them, during the implementation of the pyrotechnic expansion tube 10.
- the fibers placed in part 10 are generally oriented mainly in the direction longitudinal, to ensure the transmission of efforts applied to them mainly in this direction.
- an organ of holding 44 is also fixed on the part 10, to the opposite of the pyrotechnic expansion tube 16 and in face of it.
- the holding member 44 includes a edge 46 which extends along the cutting line 12. This edge 46 is practically in contact with edge 42 of the buttress 40.
- the holding member 44 is made in one deformable material; in order to follow the deformation of the part 10 during its cutting ordered by the setting tube pyrotechnic expansion tube 16, and it extends a certain distance away from its edge 46.
- the holding member 44 is advantageously made of a material similar to that in which is formed the part 10 to be cut. In case this last one is made of composite material, the support 44 can therefore be integrated directly into the part during its manufacture, in the same way as the buttress 40 in the embodiment illustrated on Figure 3.
- the maintenance member 44 has the functions of maintain the integrity of the corresponding part of the part 10 and absorb the shock when cutting. he therefore makes it possible to further improve the cleanliness of the cutting.
- the holding member 44 preserves the integrity of the adjacent part of the part 10 after cutting, by opposing its delamination.
- Figure 4 there is shown a device of pyrotechnic cutting comparable to that which comes to be described with reference to Figure 3, applied to the simultaneous cutting of two pieces 10.
- the holding members 44 associated with the pieces 10 to be cut are fixed on a spacer 36 by fixing means such as bolts (not shown) whose location is illustrated by the dashed lines 38, respecting the same conditions as those described previously referring to Figure 2. More precisely, the attachment of parts 10 and organs holding 44 on the spacer 36 is made in one location 38 relatively distant from the tube 16 and the cutting lines 12 adjacent to the spacer 20 and at the buttresses 40. This characteristic facilitates the bending of the parts 10 by pivoting around the means aforementioned fixing, necessary for a good cut by shearing the two pieces along the spacer 20 and buttresses 40.
- the parts 10 can take a wide variety of forms, outside the area of junction in which the device is located cutting.
- the two parts 10 can remain parallel to each other and be connected by a structure honeycomb 48, for example honeycomb.
- the parts 10 then constitute the skins of a structure sandwich whose soul is formed by the structure alveolar 48.
- the parts 10 can also be connected to each other to form a structure monobloc, outside the junction area materialized by the device 14.
- the spacers 20 and 36 can optionally do integral parts of these parts 10.
- the two pieces 10 to be cut form the skins of a first sandwich structure 50, the core of which consists of a cellular material 48, by honeycomb example.
- the expansion tube 16 pyrotechnic is housed in a space 28, devoid of cellular material, formed near one of the edges of the sandwich structure 50.
- a spacer 36 delimits the space 28, on the side of the cellular material 48. This spacer 36 is fixed between the parts 10 by fixing means such as bolts (not shown) whose location 38 is also far as possible from the pyrotechnic expansion tube 16.
- the second structure sandwich 52 includes two skins 40, a core 56 in one cellular material, for example honeycomb, and a spacer 20 replacing the core 56 along the edge of this structure adjoining the first structure sandwich 50.
- the end parts of the two parts 10 penetrate between the skins 40 and the spacer 20 and fixing means such as bolts (not shown) connect the stack thus formed by the skins 40, the parts 10 and the spacer 20.
- fixing means such as bolts (not shown) connect the stack thus formed by the skins 40, the parts 10 and the spacer 20.
- These means are located at a location 30 also as close as possible to the edges 42 of the skins 40 and the face 21 of the spacer 20 facing the space 28. From plus, the edges 42 and the face 21 are aligned according to the cutting lines 12 provided in parts 10.
- the skins 40 of the second sandwich structure 52 perform the same function as the buttresses in the embodiments described above. It is why they were designated by the same digital references.
- the cutting device pyrotechnic 14 allows, in all the cases, a direct cutting of one or two pieces in non-metallic material, and in particular of material composite, according to one or more sharp cutting lines and well located, in clean conditions generally satisfactory.
- the lines of cutout 12 can either be aligned with the same spacer 20, as shown, be aligned with each of the spacers 20 and 36.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Vibration Dampers (AREA)
- Air Bags (AREA)
- Treatment Of Fiber Materials (AREA)
Description
- la figure 1 est une vue en coupe qui représente schématiquement une première forme de réalisation du dispositif de découpe pyrotechnique conforme à l'invention, selon laquelle le contrefort est sensiblement indéformable, dans le cas où une seule pièce non métallique doit être découpée ;
- la figure 2 est une vue en coupe schématique représentant une variante de réalisation du dispositif de découpe de la figure 1, appliquée à la découpe simultanée de deux pièces non métalliques ;
- la figure 3 est une vue en coupe schématique comparable à la figure 1, illustrant une deuxième forme de réalisation de l'invention, selon laquelle le contrefort est déformable, dans le cas où le dispositif comprend de plus un organe de maintien ;
- la figure 4 est une vue en coupe schématique représentant une variante de réalisation du dispositif de découpe de la figure 3, appliqué la découpe simultanée de deux pièces non métalliques ; et
- la figure 5 est une vue en coupe schématique illustrant une autre forme de réalisation de l'invention, dans laquelle deux pièces à découper et deux contreforts forment respectivement les peaux de deux structures sandwich que l'on désire pouvoir séparer.
Claims (11)
- Dispositif de découpe pyrotechnique comprenant un tube (16) à expansion pyrotechnique monté dans un espace (28) ménagé entre deux pièces (10,18) et délimité par au moins une entretoise (20) reliant ces deux pièces, de façon à découper au moins l'une des pièces selon au moins une ligne de découpe (12) lorsque le tube est mis en oeuvre, caractérisé par le fait que chaque pièce (10) à découper est en matériau non métallique, un contrefort (40) étant fixé sur celle-ci, à l'opposé et en face de l'entretoise (20), de telle sorte qu'un bord (42) du contrefort s'étende le long de la ligne de découpe (12).
- Dispositif selon la revendication 1, dans lequel le contrefort (40) est sensiblement indéformable.
- Dispositif selon la revendication 1, dans lequel le contrefort (40) est réalisé en un matériau déformable.
- Dispositif selon l'une quelconque des revendications précédentes, dans lequel un organe de maintien (44), réalisé en un matériau déformable, est fixé sur chaque pièce (10) à découper, à l'opposé et en face du tube (16) à expansion pyrotechnique, l'organe de maintien (44) comprenant un bord (46) qui s'étend selon la ligne de découpe (12), et se prolongeant en éloignement de ce bord.
- Dispositif selon les revendications 3 et 4 combinées, dans lequel le contrefort (40) et l'organe de maintien (44) sont réalisés dans le même matériau que la pièce (10) à découper et ce matériau est un matériau composite formé de nappes de fibres longues noyées dans une matrice de résine.
- Dispositif selon l'une quelconque des revendications précédentes, dans lequel lesdites pièces (10,28) et l'entretoise (20) sont réalisées dans le même matériau non métallique, sous forme monolithique.
- Dispositif selon l'une quelconque des. revendications 1 à 5, dans lequel l'entretoise (20) est fixée entre les pièces (10,18) par des moyens de fixation (30) traversant celles-ci.
- Dispositif selon l'une quelconque des revendications 1 à 7, dans lequel une seule (10) des deux pièces est à découper, l'autre pièce étant une pièce d'appui (18) sensiblement indéformable.
- Dispositif selon l'une quelconque des revendications 1 à 7, dans lequel les deux pièces (10) sont à découper, ledit espace (28) étant délimité par deux entretoises (20,36) et un contrefort (40) étant placé sur chacune desdites pièces (10), en face d'une première (20) des entretoises.
- Dispositif selon la revendication 9 combinées, dans lequel les deux pièces (10) forment des peaux d'une première structure sandwich (50), et les deux contreforts (40) forment des peaux d'une deuxième structure sandwich (51) dans laquelle pénètrent des parties terminales desdites pièces (10).
- Dispositif selon l'une quelconque des revendications 9 et 10, dans lequel la deuxième entretoise (36) est fixée entre les pièces (10) en un emplacement éloigné du tube (16) à expansion pyrotechnique.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9806898 | 1998-06-02 | ||
FR9806898A FR2779223B1 (fr) | 1998-06-02 | 1998-06-02 | Dispositif de decoupe de pieces non metalliques au moyen d'un tube a expansion pyrotechnique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0962742A1 EP0962742A1 (fr) | 1999-12-08 |
EP0962742B1 true EP0962742B1 (fr) | 2002-12-11 |
Family
ID=9526929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99401321A Expired - Lifetime EP0962742B1 (fr) | 1998-06-02 | 1999-06-01 | Dispositif de découpe de pièces non metalliques au moyen d'un tube à expansion pyrotechnique |
Country Status (5)
Country | Link |
---|---|
US (1) | US6170400B1 (fr) |
EP (1) | EP0962742B1 (fr) |
DE (1) | DE69904394T2 (fr) |
ES (1) | ES2188109T3 (fr) |
FR (1) | FR2779223B1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6412415B1 (en) * | 1999-11-04 | 2002-07-02 | Schlumberger Technology Corp. | Shock and vibration protection for tools containing explosive components |
US6422148B1 (en) * | 2000-08-04 | 2002-07-23 | Schlumberger Technology Corporation | Impermeable and composite perforating gun assembly components |
FR2838818B1 (fr) | 2002-04-19 | 2006-12-08 | Eads Launch Vehicules | Dispositif de liaison provisoire et de separation pyrotechnique de deux elements, sans rupture |
FR2839550B1 (fr) | 2002-05-07 | 2004-07-30 | Eads Launch Vehicles | Dispositif de liaison provisoire et de separation pyrotechnique de deux elements, a organe mobile |
FR2868351B1 (fr) * | 2004-04-02 | 2006-06-23 | Pyroalliance Sa | Dispositif de decoupe d'une structure dans un vehicule automobile |
WO2007140258A2 (fr) * | 2006-05-26 | 2007-12-06 | Owen Oil Tools Lp | Dispositifs et procédés de perforation pour applications de puits de forage haute pression |
FR2946101B1 (fr) | 2009-05-29 | 2011-07-01 | Astrium Sas | Dispositif de liaison provisoire et de separation pyrotechnique de deux ensembles |
FR2973869B1 (fr) * | 2011-04-06 | 2013-05-03 | Astrium Sas | Piece a rupture pyrotechnique detonante |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2453960A (en) | 1944-03-23 | 1948-11-16 | Asea Ab | Means for charging storage batteries |
US3453960A (en) | 1967-12-11 | 1969-07-08 | Gen Dynamics Corp | Noncontaminating linear explosive separation |
US3486410A (en) | 1968-04-18 | 1969-12-30 | Mc Donnell Douglas Corp | Explosive severance means |
US3698281A (en) | 1970-02-27 | 1972-10-17 | Lockheed Aircraft Corp | Explosive system |
US4314500A (en) * | 1980-01-25 | 1982-02-09 | The United States Of America As Represented By The Secretary Of The Air Force | Instantaneous opening positive lock mechanism |
US4685376A (en) | 1985-06-24 | 1987-08-11 | Mcdonnell Douglas Corporation | Separation system |
FR2598769B1 (fr) | 1986-05-13 | 1988-08-05 | Jade Sa | Garniture d'etancheite hydraulique ou pneumatique |
FR2598796B1 (fr) | 1986-05-16 | 1990-04-20 | Aerospatiale | Dispositif de separation pyrotechnique de deux elements |
US4901802A (en) * | 1987-04-20 | 1990-02-20 | George Flint R | Method and apparatus for perforating formations in response to tubing pressure |
US4778009A (en) * | 1987-07-13 | 1988-10-18 | Halliburton Company | Shock actuated switch for perforating gun assembly |
US4829901A (en) * | 1987-12-28 | 1989-05-16 | Baker Hughes Incorporated | Shaped charge having multi-point initiation for well perforating guns and method |
US4885993A (en) * | 1988-02-17 | 1989-12-12 | Goex, Inc. | Shaped charge with bifurcated projection for detonating cord |
US5390606A (en) * | 1992-11-02 | 1995-02-21 | Orbital Sciences Corporation | Frangible joint separation system |
US5392684A (en) * | 1993-06-25 | 1995-02-28 | The Ensign-Bickford Company | Explosive thrust-producing coupling |
US5331894A (en) * | 1993-06-25 | 1994-07-26 | The Ensign-Bickford Company | Explosive release coupling |
-
1998
- 1998-06-02 FR FR9806898A patent/FR2779223B1/fr not_active Expired - Fee Related
-
1999
- 1999-06-01 DE DE69904394T patent/DE69904394T2/de not_active Expired - Lifetime
- 1999-06-01 EP EP99401321A patent/EP0962742B1/fr not_active Expired - Lifetime
- 1999-06-01 ES ES99401321T patent/ES2188109T3/es not_active Expired - Lifetime
- 1999-06-02 US US09/323,829 patent/US6170400B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0962742A1 (fr) | 1999-12-08 |
US6170400B1 (en) | 2001-01-09 |
DE69904394T2 (de) | 2003-10-30 |
ES2188109T3 (es) | 2003-06-16 |
DE69904394D1 (de) | 2003-01-23 |
FR2779223B1 (fr) | 2000-08-11 |
FR2779223A1 (fr) | 1999-12-03 |
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