Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F3/00—Severing by means other than cutting; Apparatus therefor
  • B26F3/04—Severing by squeezing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
  • B63B21/56—Towing or pushing equipment
  • B63B21/58—Adaptations of hooks for towing; Towing-hook mountings
  • B63B21/60—Quick releases
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
  • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
  • F42B1/02—Shaped or hollow charges
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B3/00—Blasting cartridges, i.e. case and explosive
  • F42B3/006—Explosive bolts; Explosive actuators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B3/00—Blasting cartridges, i.e. case and explosive
  • F42B3/087—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries
  • F42B3/093—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries in mat or tape form

Definitions

• the invention is particularly useful for cutting wire or chain during a towing or lifting operation, as for instance, an anchor wire or an anchor chain in an anchor handling situation.
• the system comprises a tension detecting means for a trawler cable, means for detecting trim of the vessel, an alarm system and a cable cutter.
• the cable cutter is of a pyrotechnic type, with a housing that surrounds the cable in its peripheral direction. A hollow charge which partially surrounds the cable is arranged in the housing.
• the system is designed to detect abnormal tension in the trawler cable which may lead to capsize, and, on detonation of the hollow charge, to cause a point on the cable to be struck by a jet and/or be subjected to heat and/or pressure which will result in the cable being cut.
• the published international patent application PCT/EP2007/051572 describes a cable cutter of the pyrotechnic type, with a hollow charge arranged in a housing through which the cable is passed.
• the hollow charge is given a V-shaped cross-section, is formed as a part of a circular arc, and thus partly surrounds the cable.
• the housing comprises a device for positioning a part of the cable that is to be cut centrally in relation to the focal point.
• the patent document US3089417 describes a pyrotechnic cable cutter for use in aircraft with an emergency release cockpit for cutting of control cables between the cockpit and the control surfaces of the aircraft.
• the cable cutter comprises a device for fastening an explosive to the cable at the point on the cable at which, in an emergency situation, it is to be cut to ensure that the cockpit will be released from the rest of the aircraft body.
• the cable cutter is formed of an annular holder which surrounds the cable in its circumferential direction, and a substantially rectilinear, elongate hollow charge explosive with a detonator secured to the fastening device in immediate proximity of and tangential to the cable.
• the patent document US 2920532 describes a cable cutter with a V-shaped hollow charge explosive located in a housing, and an arrangement for holding a cable against an open end of the housing from where the material from the explosive will stream out on detonation.
• the V-shaped surface of the explosive is covered with a layer.
• the patent document US 2185303 describes a pyrotechnic cable cutter wherein a piston is located in a cylinder and wherein the cylinder at a first end has inserted an explosive which, when detonated, drives the piston to move through the cylinder.
• a cutting device At the second end of the cylinder there is located a cutting device in a housing which in a portion thereof also surrounds the cable. When the cutting device is struck by the piston, it is driven towards the cable so that the cable is weakened or cut.
• the known cable cutters of pyrotechnic type comprise a fully encircling casing or sleeve designed to prevent substantially all movement of the cable transverse to the longitudinal direction of the cable so that it is at all times in the point of action of the hollow charge explosive, or they are constructed to act on a specific point on the cable and are unsuitable for installation or use on vessels that are lifters, towing vessels or anchor handling vessels where the wire, cable or chain must be guided and winched over an open deck and where there is no suitable location for the mounting of such encasing installations or cable-mounted devices.
• the present invention provides an apparatus for immediate cutting of a cable or the like according to independent claim 1, a wire cutter apparatus according to claim 17 and a vessel according to claim 18.
• the apparatus of the invention is adapted for installation in or under a deck of a vessel participating in a towing or lifting operation, such as in a towing or anchor handling vessel that is used in offshore activities, immediately below a deck plate in a part of the deck over which chain, wire or the like is run.
• the apparatus installed under the vessel's deck works in that it produces a cutting effect that penetrates and cuts the chain, wire or the like at a point or location at which it is passed over the deck.
• the apparatus of the invention When installed under the deck plate, the apparatus of the invention also effects a penetration of the ship's deck, is preferably dimensioned to penetrate deck plates of a thickness of about or a little more than 40 mm, and has a capacity for cutting or weakening wire or chain of the aforementioned dimensions.
• Li an advantageous embodiment of the inventive apparatus it comprises an active part formed of a high- velocity (i.e., rapid reacting) thermally reactive material, as, for example, a blasting agent or explosive, which on initiation (detonation) produces the desired penetration and cutting effect, this taking place at extremely high speeds and for the purposes of the invention is to be considered as instantaneous.
• a high- velocity thermally reactive material as, for example, a blasting agent or explosive, which on initiation (detonation) produces the desired penetration and cutting effect, this taking place at extremely high speeds and for the purposes of the invention is to be considered as instantaneous.
• the mode of operation of the inventive apparatus is as follows:
• the thermally reactive material is shaped and positioned such that on thermal reaction it generates a pressure in the direction of the said chain, wire or the like, and, if installed under a deck plate, also the deck plate, which typically results in such tensions in the target material, and partly also such thermal impact that the yield limit of the target material is exceeded.
• the target material disintegrates so that, in the case of the said chain, wire or the like, the said cable, chain, wire or the like is cut almost immediately.
• the thermal rapid-reacting material is so arranged that during the reaction it provides a geometric focusing towards a convergence point, a convergence line or a convergence plane, of pressure, and possibly also material and heat, which are ejected during the reaction.
• the individual explosive unit has a thermally reactive material with a V- shaped, pyramid-shaped or conical surface on the ejection side and is arranged so as to eject a shock wave, material or heat in a unified stream towards a convergence region, which, for example, is adapted so that the convergence point lies in or close to the centre of the object that is to be cut.
• metallic additives are added so as to obtain a substantial strengthening of the effect at the convergence point of the geometric focus in the thermally reactive material.
• Explosive is basically used as a generic term for such thermal materials that are well suited for the performance of the invention.
• Figure IA is a side view illustrating a typical vessel for raising, lifting, towing or anchor handling
• Figure IB is a perspective view showing a part of a stern of the vessel illustrated in Figure IA and a below-deck installed wire or chain cutter apparatus according to the present invention
• Figure 1C is a longitudinal sectional view of a part of the stern illustrated in Figure IB which illustrates the below-deck installed wire or chain cutter apparatus according to the present invention
• Figure 2 is a perspective view showing an enlarged part of the illustration in Figure IB of the below-deck installed wire or chain cutter apparatus according to the present invention
• Figure 3 is a longitudinal section of the stern showing an enlarged part of the illustration in Figure 1C of the below-deck installation of the wire or chain cutter apparatus according to the present invention
• Figure 4A is a schematic cross-sectional view of an installation with a first embodiment of a wire or chain cutter apparatus according to the present invention
• Figure 4B is a schematic longitudinal section of an installation with the first embodiment of a wire or chain cutter apparatus according to the present invention
• Figure 5 is a schematic cross-sectional view of an installation with a second embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure 6 is a schematic longitudinal section of an installation with the second embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure 7 is a schematic cross-sectional view of an installation with a third embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure 8 is a schematic longitudinal section of an installation with the third embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure 9 A is a schematic illustration of a cross-sectional view of a first arrangement of individual explosives in the third embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure 9B is a schematic illustration of a cross-sectional view of a second arrangement of individual explosives in the third embodiment of a wire or chain cutter apparatus according to the present invention.
• Figure IA illustrates a typical vessel for raising, lifting, towing or anchor handling.
• the vessel has a large open afterdeck which typically has a winch arrangement on the end facing the bow, and the end that faces astern is open so that objects which are handled, such as anchor chain or an anchor can be winched up over the stern and optionally up onto the deck.
• Figure IB illustrates in more detail, by means of an example, the stern of the vessel with a cable, wire or chain 1 that is about to be raised, lowered or taken in tow and run over the afterdeck 2 towards the winch arrangement (not shown), and manipulating devices 3 which typically are in the form of shark jaw and/or towing pins for securing cable, wire or chain or for guiding them.
• the broken lines illustrate a wire and chain cutter 100 according to the present invention as installed under the deck 3, or as incorporated in the deck 3.
• Figure 1C shows in a longitudinal section through the vessel's stern cable, wire or chain s 1, manipulating devices 3 for locking or guiding said cable, wire or chain 1, the deck 2 and also, in cross-section, a wire or chain cutter 100 according to the present invention as installed below the deck 3 or as incorporated in the deck 3.
• Figure 2 illustrates in perspective the vessel deck with Q manipulating devices, and in a broken line indicates an advantageous location of a wire and chain cutter according to the present invention, as installed below the deck or as incorporated in the deck.
• the invention thus meets the need for and requirement that the deck should be free of installations other than the manipulating devices which are necessary to hold or guide the actual cable, wire or chain that is handled, but at the sames time ensures that there are means for at all times being able, in an emergency situation, to immediately cut the cable, wire or chain concerned.
• the inventive apparatus on the vessel is immediately astern of the manipulating devices, and0 is provided with a longitudinal extent transverse to the vessel's longitudinal direction which corresponds to at least the largest possible displacement of wire or chain across the longitudinal direction of the vessel at the installation site of the apparatus.
• FIG. 3 also illustrates, in a longitudinal section through the stern 5 of the vessel, the vessel deck with manipulating means, and individual details of a pyrotechnic cutter apparatus in an advantageous location according to the present invention, as installed below the deck or as incorporated in the deck.
• wire will be used to refer to a cable, wire, chain or the like that is to be immediately cut in an emergency situation by using the invention. 5
• the first embodiment of the inventive wire cutter 100 is an elongate assembly comprising an elongate, external housing 10 of a rigid and robust structure formed of a bottom 11 , four side walls 12, 13, 14, 15, preferably made of steel, a layer of damping material 20, preferably of polyurethane of uniform thickness, as a layer which substantially covers the inside of the bottom and the side walls of the external housing 10, thereby constituting a damping intermediate housing consisting of a bottom 21, four side walls and end walls 22, 23 and 24, 25, respectively, an internal housing 30 formed of a bottom 31 and side walls and end walls 32, 33 and 34, 35, respectively, which are shape-adapted to the internal form of the damping material layer formed by the intermediate housing, and which preferably are of steel or other strong material which may be of uniform thickness, and an explosive member 40 which is formed of an elongate explosive element that has a bottom face 41, side faces and end faces 42, 43 and 44, 45 respectively, and is shaped to fill the internal housing wholly or partly and has first and second surfaces 46, 47 in a V
• the V-shape is presented clearly in the sectional view in Figure 4A, whilst the top view in Figure 4B, by means of the line 48 in the centre of the drawing, indicates the bottom line of the V-shape.
• 'upper' and 'lower' refer in this description to the directions that apply in the illustrations when observed normally.
• FIG 4A also illustrates a fastening device 70, for securing the inventive apparatus 100 to the underside of the deck plate 2.
• the fastening device 70 may be made in the form of a rectangular assembly of a total of four side walls and end walls 71, 72 and 73, 74, respectively, which by the use of, for example, bolt fasteners or a welding method are connected to the upper edges of respective sidewalls and end walls 11, 12 and 13, 14, respectively, of the external housing 10 and to the underside of the deck plate 2 with sufficient holding power to ensure the external housing 10 remains in its position and connected to the deck 2 also after the explosive has been detonated and thus ensures a sealing of openings which will be cut in the deck by the detonation against the remaining volume or space that is found below the deck 2.
• a rigid and solid anchoring of the external housing to the underside of the deck plate 2 also maintains the integrity of the deck structure even when the apparatus 100, on detonation, has created a substantial elongate opening in the deck.
• the height of the fastening device 70 that is to say, the distance that is established by the fastening device between the deck plate 2 and the external housing 10 when the apparatus 100 is below the deck plate 2 is determined partly on the basis of selected shape and configuration of the explosive member 40 and the type of wire the vessel is to handle. In some cases, the fastening device 70 can therefore be omitted and the external housing 10 is then mounted directly on the means for fastening the apparatus 100 to the deck plate 2.
• the apparently continuous elongate V-shaped explosive is formed of a plurality of sections or shorter individual explosives which each have basically the same V-shape in cross-section and which have V-shape bottom lines 48 that are essentially coincident or at least substantially parallel.
• the illustrative example shown in Figure 6 is formed of eight sections or juxtaposed individual explosives which are provided with a respective detonator or a detonator arrangement that gives a controlled detonation of each section or of each individual explosive at different times.
• the sections or individual explosives are preferably separated from each other by devices 80 which ensure that detonation of one explosive does not cause detonation of a neighbouring explosive, such as a plate or similar dividing wall which diverts or damps a shock wave and/or heat generation.
• V-shaped explosives With V-shaped explosives, the shock wave, the generated heat and the accompanying material from each individual detonated section or individual explosive will travel from the wire cutter apparatus 100 essentially in a common convergence plane 4 that lies in the longitudinal direction of the bottom line 48 of the V-shape, which is indicated in the broken, thick line denoted by reference numeral 4 in Figure 5.
• the explosive member 40 of the wire cutter apparatus 100 is formed of a larger number of elongate substantially circular-cylindrical or conical individual explosive units 90, each of which comprises an associated explosive 91 which in an upper part, in a longitudinal section, has an essentially V-shaped contour that is produced by a cavity 60 which is conical in the upper part of the individual explosive.
• the explosive member 40 of the wire cutter apparatus 100 is formed of eighty-eight (88) individual explosive units 90, each of which is provided with a detonator or a detonator arrangement which gives a controlled detonation of each individual explosive at different times.
• the individual explosive units 90 each comprise a cylindrical or conical housing 92 which houses the actual explosive 91, and which also forms a partition between them.
• the individual explosive units 90 are also separated by devices 80 which ensure that detonation of one explosive does not cause detonation of a neighbouring explosive, as, for example, an arrangement of plates or similar dividing walls, or a filler material that essentially fills the space between the explosive units 90, and which are provided to divert or damp a shock wave and/or heat generation from a detonating neighbouring explosive unit 90 in a degree sufficient to prevent the detonating explosive from detonating a neighbouring explosive unit.
• devices 80 which ensure that detonation of one explosive does not cause detonation of a neighbouring explosive, as, for example, an arrangement of plates or similar dividing walls, or a filler material that essentially fills the space between the explosive units 90, and which are provided to divert or damp a shock wave and/or heat generation from a detonating neighbouring explosive unit 90 in a degree sufficient to prevent the detonating explosive from detonating a neighbouring explosive unit.
• At least a plurality of the elongate individual explosive units 90 are not circular-cylindrical, but each is cylindrical with a rectangular or square shape seen in section transverse to its longitudinal direction, and has a uniform width along its length, or they are tapered towards the bottom in a pyramid shape, and are then provided with an explosive formed to produce a V-shaped cavity with a respective bottom line, and where this plurality of individual explosive units 90 is installed in the internal housing with the bottom lines of the V-shaped cavities directed in the longitudinal direction of the apparatus 100.
• the exemplary constellation of individual explosive units 90 which is illustrated in cross-section in Figure 7 and in longitudinal section in Figure 8, indicates for an advantageous embodiment of the inventive apparatus 100 that the elongate individual explosive units 90 are uniform, circular-cylindrical housings 92 that are arranged side by side with essentially parallel longitudinal axes, and that they have uniform explosives 91.
• each individual explosive unit 90 on detonation, ejects a respective shock wave, material and heat essentially together along and in a direction which is illustrated by the thick broken ejection line indicated by the reference numeral 5.
• a greater length of the wire can advantageously be struck when the individual explosive units 90 in the explosive member 40 are detonated together or successively for vessels that handle wires which, with greatest safety, can be cut or weakened until they break by application of force at several points along a part of their length, the ejection lines 5 for the respective individual explosive units 90 being essentially parallel in the sense that they do not result in a significant and intended gathering or concentration of ejected pressure waves, material or heat in an area where the deck plate or wire will be located.
• a constellation of individual explosive units 90 in the explosive member 40 like the constellation examples which in Figures 9A and 9B are illustrated by a cross-sectional view, and where it is shown that transverse to the longitudinal direction of the apparatus there is mounted at most five (5) individual explosive units 90.
• the number five which applies in particular in the illustrated examples is not limiting for similar constellations, but it is required that the number is at least two (2).
• Each of the individual explosive units 90 in these constellations is mounted in the wire cutter apparatus 100 according to the invention at different angles with an angle between them as indicated by the reference numeral 7 in a plane lying essentially transverse to the longitudinal direction of the elongate wire cutter apparatus 100, and in such manner that the respective ejection lines 5 of these five individual explosive units 90 are gathered in a convergence point in an area at the point or points of intersection of the ejection lines as one common point of action or several common points of action for the shock waves, the material and the heat which, on detonation, are ejected from each of the individual explosive units 90.
• the indicated angles 7 between the ejection lines 5 in the illustrative examples which are outlined in Figures 9A and 9B are thus different, the angle 7 in Figure 9A being smaller than the angle 7 in Figure 9B.
• the inventive apparatus 100 may advantageously further comprise a detonation control device or a detonator arrangement which effects a controlled detonation of the explosive sections of the explosive member 40 or of individual explosives 90 at different times.
• a detonation control device or a detonator arrangement which effects a controlled detonation of the explosive sections of the explosive member 40 or of individual explosives 90 at different times.
• Time control of the detonation times may be favourable by combining detonation time sequence, alignment angle of the direction of ejection, V-shaped variants and coating variants for formation of a so-called "metal storm" directed towards deck plate and wire, where, by means of the time control, the metal storm is established in several time phases, the deck and the outer parts of the wire being struck in a first phase, and the inner parts or core parts of the wire being struck in one or more immediately timewise subsequent phases.
• the time control is advantageously programmable, a detonation sequence that is determining for the time relation between the phases being programmed by distinct programs for each type of wire the vessel may have to handle, and is then selected and made ready for instantaneous activation before the handling operation in question is started.
• the apparatus 100 For damping by, for example, absorption, by-products of the sudden reaction in the thermally reactive material of the explosive, which, for instance, are in the form of heat and pressure, the apparatus 100, as mentioned above, is advantageously provided with a single-layer or multilayer absorbent material that is adapted to absorb some or most of the by-products.
• the apparatus advantageously also comprises, as mentioned, a casing arranged such that a penetration of the target material does not reduce the remaining structural integrity of the invention's structure or other parts of the surrounding structure, preferably also such that an initiation of the rapid thermal reaction, for example, detonation, does not result in any other effect that constitutes a danger for nearby objects.
• a new arrangement is provided in a vessel deck with a simple installation of the inventive wire cutter apparatus for immediate cutting of a weight-loaded or tension-loaded wire that can effectively prevent or avert a case of vessel damage, crew injury, capsize or other loss of vessel or crew as a result of the weight or tension loading of the wire.
• the condition or structure of the deck 2 may, however, have to be taken into account in connection with location or installation in the vessel.
• the problems that are seen to have to be solved may be related to structural elements in or immediately below the deck or structural factors in connection with the deck plate itself, which do not permit a single wire cutter apparatus 100 as described herein to safely provide the required emergency cutting effect, hi an inventive application of the inventive wire cutter apparatus, there is provided in or under the deck plate a group arrangement of a plurality of wire cutter apparatuses arranged essentially parallel as regards their longitudinal axes, which are advantageously angled about their longitudinal axes in relation to each other, and which by detonation control are arranged to be triggered for detonation wholly or partly simultaneously or in an advantageous sequence, in order to penetrate the deck plate simultaneously with the strike against the wire, or in order first to penetrate the deck plate and immediately after strike the wire itself.
• Figure 9A or 9B may, with a view to such a group arrangement of a plurality of elongate wire cutter apparatuses 100 as provided by this invention, also be used to illustrate in a sectional plane transverse to the longitudinal direction of the wire cutter apparatuses, examples of group arrangements of five (5) elongate wire cutter apparatuses which are in that case indicated in this connection by the reference numeral 90, with their respective ejection planes indicated in section by the lines that are pointed to by the arrow linked to the reference numeral 5, and where the reference numeral 7 in this particular connection indicates the angle of each individual apparatus about its longitudinal axis in relation to one or more of the other wire cutter apparatuses that are included in the group arrangement.
• the detonation sequence is thus adapted to the configuration of the group arrangement and is also intended to be arranged such that the sequence timewise takes into account a lifting of the wire from the deck as a result of the deck penetration which runs ahead of the actual application of force against the wire.
• the attachment means 70 for coupling the wire cutter apparatus 100 or a group arrangement thereof may comprise or be constituted by a deck plate part of a structure and/or a condition that provides or has the same strength and holding power as also specified for the open deck in the area which, here, has been designated by the invention for installation of the wire cutter apparatus 100 or a group arrangement thereof.
• an elongate part of a deck of ordinary deck plate of the aforementioned type may be replaced by a sandwich structure, preferably of steel and adapted to be welded in place as a deck part, which in the installation area concerned gives the deck the required impact strength and load holding power and moreover makes minimum demands on the undermounted wire cutter apparatus or apparatuses which are installed there primarily for penetrating the deck or for effecting both penetration of the deck and cutting of the wire.
• the inventive apparatus is primarily intended to be adapted for permanent installation, but can alternatively be realised as a separate mobile unit.
• the inventive apparatus is advantageously sunk into, or as indicated above and shown in some of the attached drawings, mounted immediately below the afterdeck of an anchor handling (AH) vessel, but may alternatively or additionally be included as attached to or an integral part of a hydraulic AH unit or similar apparatus.
• AH anchor handling
• the external housing is internally coated preferably with one or more layers of a shock absorbing or deformable material that may be a material which, due to material properties or design, has large deformation energy.
• the apparatus is further preferably coated with a layer of shock resistant material, as, for instance steel, which constitutes the internal housing and which in turn supports an additional internal layer in the apparatus of the thermal rapid-reacting material, which typically is a blasting agent or explosive.
• a layer of shock resistant material as, for instance steel
• the blasting agent or explosive has a depression, which advantageously in the case where the housing is of an elongate form, also is correspondingly elongate.
• the advantageous depression form when the apparatus is illustrated in section transverse to the longitudinal direction as illustrated in some of the attached figures, is a V-shape where the bottom of the V-shape is located centrally in the said direction.
• the aforementioned inner covering layer or coating of, for example, Cu, for strengthening the directed explosive effect that the invention will provide, can be placed against the surface of the V-shaped depression, and is so formed that it preferably follows and reproduces on the inside of the apparatus the inner V-shape of the blasting agent.
• the second or third embodiment of the apparatus 100 preferably comprises a rail or bracket arrangement designed to hold the individual explosive units 90, which in turn are secured to the internal housing.
• An installation of the apparatus 100 according to the invention is made preferablyo transversely below deck, preferably as far back in the ship as possible.
• the cavity pos. 6 above the charge pos. 4 forms a "standoff to obtain the desired acceleration and form of the "projectile” that perforates the deck and the object to be cut. s
• the charges are dimensioned in relation to the deck thickness that is found on the various types of ship.
• One method of the invention comprises making the inventive apparatus by assembling the elements of the invention in the assembly as 5 explained above.
• One method of the invention comprises using the inventive apparatus by equipping a vessel with the inventive apparatus as explained above.
• Q Activation of the inventive apparatus which comprises initiating (detonating) the thermal rapid reaction will, when the apparatus is installed in or immediately below the afterdeck of an anchor handling vessel (AH vessel), provide a safety barrier that acts to avoid loss of crew or ship in a case where a load connected to said chain, wire or the like goes out of control in such manner that there is a danger to the ship or crew, and 5 where cutting the said chain, wire or the like can help to avoid or reduce such danger.
• the inventive apparatus has such structural features that it is safe to handle and can withstand huge mechanical and temperature stresses.
• the invention may comprise one or more initiating mechanisms, preferably of the type that have two or more firing barriers to eliminate unintentional activation.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Ocean & Marine Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Electric Cable Installation (AREA)
• Crushing And Pulverization Processes (AREA)
• Installation Of Indoor Wiring (AREA)

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Applications Claiming Priority (2)

Publications (1)

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Cited By (4)

Citations (9)

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• 2008
  • 2008-08-25 NO NO20083649A patent/NO328744B1/no not_active IP Right Cessation
• 2009
  • 2009-08-21 GB GB1103776.9A patent/GB2475207B/en not_active Expired - Fee Related
  • 2009-08-21 CN CN2009801333324A patent/CN102137741A/zh active Pending
  • 2009-08-21 WO PCT/NO2009/000294 patent/WO2010024684A1/en active Application Filing
  • 2009-08-21 BR BRPI0917103A patent/BRPI0917103A2/pt not_active IP Right Cessation

Patent Citations (9)

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