US3352459A

US3352459A - Roll bar explosive cutter mechanism

Info

Publication number: US3352459A
Application number: US578640A
Authority: US
Inventors: William H Sustrich; Francis Gus
Original assignee: Individual
Current assignee: Individual
Priority date: 1966-09-12
Filing date: 1966-09-12
Publication date: 1967-11-14
Anticipated expiration: 1984-11-14

Description

Nov. 14, 1967 w. H. S USTRICZH E AL 3,352,459

ROLL BAR EXPLOSIVE CUTTER MECHANISM Filed Sept. 12, 1966 2 Sheets-Sheet 1 27 52 g I I A 37 40 L 4s 34 32 i 38 24 I l 32 H 5: :I .[L

INVENTOR. WILLIAM H. SUSTRICH GUS FRANCIS Y ATTORALEIS Nov. 14,1967 TRI ETAL 3,352,459

I ROLL BAR EXPLOSIVE CUTTER MECHANISM Filed Sept. 12, 1966' '2 Sheets-Sheet z rat POWER SUPPLY EVENT CONTROL ARMING SWITCH ml l SWITCH DETONATORS DETONATORS OUTLET CUTTER SEQUENCING SWITCH INVENTOR. WILLIAM H. SUSTRICH GUS FRANCIS ATTORNEYS Patented Nov. 14, 1967 3,352,459 ROLL BAR EXPLOSIVE CUTTER MECHANISM William H. Sustrich, 4022 W. Eastman Ave., Denver, Colo. 80236, and Gus Francis, 29 Palo Club Circle, Denver, Colo. 80209 Filed Sept. 12, 1966, Ser. No. 578,640 25 Claims. (Cl. 222-85) ABSTRACT OF THE DISCLOSURE The invention relates to apparatus for draining fluid tanks, such as, wing tanks for aircraft, by sequentially cutting first a drain hole and second an air breathing hole in the tank by means of explosive cutters located at different areas on the tank, the invention residing in an improvement for insuring that the holes are cut in the proper sequence, the improvement being (1) the construction of the annular explosive charge of the cutter for the drain hole with a space between its ends so that the cut out portion for the drain hole is left attached to the tank by an uncut hinge portion, and (2) a roll bar adjacent the hinge portion carrying an actuating means for actuating the detonating means for the explosive cutter of the air inlet hole, so that the detonating means for the air inlet cutter can be actuated by the hinge portion contacting the actuating means on the roll bar only after the drain hole has been cut.

This invention relates to a method and apparatus for draining liquids from a container, more particularly, it relates to a method and apparatus for sequentially cutting a liquid outlet hole and an air inlet hole in a container by means of explosively actuated cutters.

The invention is specifically directed to apparatus for draining liquids from a tank or container carried underneath an aircraft wing; however, it is by no means limited to this application as it can be used for cutting holes in various type containers, flat work and other material.

Various occasions arise where it is necessary to discharge liquids from tanks carried beneath the wings of aircraft. For example, in the use of aircraft in fighting fires or in crop dusting it may be desirable to release liquid fire retardant material or insecticides from tanks carried under the wings of the aircraft. Certain military applications now require the release of liquids from tanks carried beneath the wings of military aircraft.

The rapid and effective discharge of liquids from a suspended tank requires that an air hole be cut in the tank as well as a liquid outlet hole in order to provide for effec tice flow of fluid from the outlet hole. It is well known that in order for liquid to flow rapidly from the outlet of a container without breathing, an air inlet hole must be provided so that air can fill the space occupied by the liquid being discharged from the container. Accordingly, any method and apparatus providing for the effective release or discharge of liquids from a suspended tank must provide for the cutting of both an air inlet hole and a liquid outlet hole in the tank or container.

The apparatus for cutting the holes in the tank must be one which provides instantaneous and reliable cutting of the holes upon actuation of the cutting mechanism by the pilot. It has been found that the most efiective means for cutting the holes is the use of an explosive cutting mechanism, Such mechanisms generate large forces. It is important that the cutter back-up mechanism which is positioned on the outside of the tank not be shattered by the force of the explosion which effects cutting of the holes as shattering, with consequent production of numerous fragments of metal, plastic and other material, will result in serious damage to the aircraft.

Among the expedients which may be used for sequential cutting of the liquid outlet hole and the air inlet hole in that order, are electrically operated timing means to detonate the explosive of the cutters for the two holes in sequence; however, such expedients are not fool-proof or reproducible, and are subject to failure of circuit components and other elements which make them unreliable. One expedient to insure that the explosive for the air inlet hole is not detonated until the liquid outlet hole has been cut, is a construction by which the activating circuit for the explosive is actuated only by movement of the cut out portion for the liquid outlet hole. Such a construction must positively insure that movement of the cut out portion actuates the circuit for activation of the explosive of the air inlet cutter.

Accordingly, it is an object of this invention to provide a method and apparatus for discharging liquids from containers;

It is another object of this invention to provide apparatus for sequentially cutting holes in containers and other objects;

It is another object of this invention to provide apparatus for sequentially cutting holes in containers by means of explosive cutters operative to cut a second hole only after a first hole has been cut.

It is a further object of this invention to provide explosively actuated cutters for cutting holes in containers and other objects, which are not subject to fragmentation and shattering by the explosive which performs the cutting operation.

The invention in its broadest sense as applied to cutting holes in a container comprises two explosively actuated cutters adapted to be placed one on the bottom of the tank for cutting the liquid outlet hole and one on the top of the tank for cutting the air inlet hole, in combination with switching means which operates to actuate the cutter for the air inlet hole only after the liquid outlet hole has been cut. The sequential switching means is actuated by movement of the section of the tank cut out to form the liquid outlet hole. The explosive cutter comprises a heavy metal annulus having an arch shaped, annular groove in its bottom edge facing outwardly with an annular concave explosive charge positioned in and conforming to the groove with its concave surface facing outwardly and having a metal lining on its concave surface, and a detonation train for detonating the explosive charge.

To insure sequential cutting of first the liquid outlet hole and then the air inlet hole, the circuit for activating the explosive of the air inlet hole cutter is made actuatable only by movement of the cut out portion of the liquid outlet hole. The explosive charge for the liquid outlet cutter is circular with a space left between the ends of the charge, so that the cut out portion is not cut out all the-Way around but is attached to the tank by a hinge portion corresponding to the space between the ends of the explosive, the result being that the cut out portion swings outwardly on the hinge portion after being cut out. A chord-like roll bar is positioned in the annulus of the explosive cutter in a position corresponding to that of the space between the ends of the explosive charge. The roll bar insures reproducibility and uniformity of cutting, and that a hinge portion will be left. It also functions to support an actuating element for the activating circuit of the air inlet hole cutter which is in the path of the cut out portion so that the circuit for activating explosive of the inlet cutter will not be activated until the outlet hole is cut.

In the preferred modification, a bufier layer of non-explosive material is positioned between the explosive charge and the bottom of the groove in the annulus, the surface of the explosive is in the form of a V and two detonators are used for redundancy in detonating the explosive cuttin-g charge. Also, rather than mount the cutters directly on the tank surface it is preferred to mount them on a door or patch plate and secure the patch plate assemblies over holes in the tank so that holes are cut in the patch plate and the tanks can be reused.

The invention will now be described in conjunction with the accompanying drawings wherein like parts are represented by like numerals and in which,

FIG. 1 is a schematic showing of a liquid tank or container provided with patch plate assemblies at its top and bottom'including explosive cutters;

FIG. 2 is a cross-section of the patch plate assembly for the liquid outlet cutter shown attached to a container wall;

FIG. 3 is a top plan view of the explosive cutter of the patch plate assembly of FIG. 2;

FIG. 4 is a section taken on line -44 of FIG. 3 looking in the direction of the arrows;

FIG. 5 is a crosssection of the patch plate assembly for the air inlet hole, including an explosive cutter taken on an angled line which passes through a well in the annulus of the cutter containing the detonator, and another section of the annulus, and

FIG. 6 is a schematic showing of the circuitry for sequentially activating the explosive cutters of the liquid outlet hole and the air inlet hole, in that order.

As used throughout this specification and the claims, the expression patch plate assembly includes the patch plate and its explosive cutter attached thereto with the cutting charge adjacent the patch plate.

Referring now to FIG. 1, there is shown a tank 10 for suspension from the underneath side .of the wing of an aircraft by suspension lugs 12. The tank is for carrying liquids to be discharged While the aircraft is in flight. The liquids, of course, may be poisonous, corrosive, or otherwise deleterious. Lower and upper

patch plate assemblies

14 and 16 are schematically shown mounted for cutting liquid outlet and air inlet holes, respectively. A nozzle device 18 is connected by means of a flexible elbow 20 to mounting adapter 22 which secures the patch plate assembly 14 to the tank 10. The purpose of the nozzle, of course, is to control the stream of liquid leaving the tank.

Reference will now be made to FIGS. 2 and 3 for a description of the patch plate assembly for cutting the lower or liquid outlet hole in tank 10. The patch plate assembly 14 includes patch plate 22 and lower explosive cutter 24 which is secured to the patch plate with the explosive cutting charge adjacent the patch plate as shown. Patch plate assembly 14 is attached to tank wall 26 over hole 27 by means of circular adapter 28. The adapter 28 is positioned over explosive cutter 24 and the cutter is secured in the adapter by means of adapter ring 30. The assembly of the adapter 28, patch plate 22 and circular gasket 37 is then secured to tank wall 26 by means of bolts 32 passing through external flange 34 of adapter 28, gasket 37 and patch plate 22, and

threaded into internal circular boss 36 welded to the internal surface of lower tank wall 26. For a purpose Which will be described later, chord-like roll bar 38 is mounted in explosive cutter 24 and carries actuating button 40 for a purpose to be later described. Lead wires for the actuating button 40 and for the detonators of the explosive train of cutter 24 are brought into the roll bar and cutter through cable/connector assembly 42 which passes out through an opening in elbow 20.

Reference will now be made to FIGS. 3 and 4 for a detailed description of the explosive cutter 24 of the patch plate assembly 14 for the liquid outlet hole. The cutter is constructed in the form of an annulus 44 which must be made of strong metal, such as, high strength steel in order to provide a sufiiciently strong back-up for the explosive cutting charge to prevent shattering when the explosive charge is detonated.

The annulus 44 is of solid cross-section and is constructed with an annular groove 46 facing outwardly toward the bottom of the annulus. The groove is arc-shaped and has no square corners. This shape provides the greatest strength for the surrounding metal and presents no points of weakness to promote shattering, such as, corners which would result from a groove of rectangular shape. An annular layer 48 of resin, such as, epoxy resin, referred to hereinafter as a buffer element or layer, is potted into the bottom of groove 46. The buffer layer 48 may be of suitable non-metallic material, such as, nylon, Teflon, or other suitable plastic. The upper surface of the buffer layer 48 is V-shaped, and V-shaped explosive cutting charge 50 inside metal casing 52 is seated in the V of buffer layer 48. The explosive cutting charge 50 is circular in shape and is positioned in the groove with its concave surface facing outwardly as respects the cutter annulus.

The described construction provides for an explosive cutting charge which is V-shaped and has over its concave outer surface an annular metal liner which is the front of casing 52. As is well known, the effect of the V-shaped cavity is to concentrate the force of the explosion and localize its effect. When the V-shaped cavity is lined or covered with a layer of metal the explosion acts to transmit jets of molten metal together with jets of gas from the explosion of the charge so that the object to be cut is subjected to concentrated jets of both metal and gas. The explosive used may be TNT, Amatol, RDX and similar explosive. The metal used for the casing 52 over the explosive charge 50 is preferably lead as it can be readily formed into an annulus, but the metal used is not restricted to lead.

The cutting charge of the V-shaped annulus of explosive covered with metal sheath or casing 52 is made by filling a lead cylinder with explosive, sealing it at both ends and rolling the filled cylinder on. a V-shaped die progressively until the desired shape is obtained and until the required amount of explosive per length is obtained. This is conventional practice.

The bufier layer 48 partially surrounds the metal sheath 52 enclosing the cutting charge 50 as shown. The purpose of this is to buffer the explosive force to prevent shattering of the walls of the groove and to direct the explosive force outwardly. The ends of the metal casing 52 terminate below the edge surface of the annulus 44 as shown to provide the proper standoif distance for the cutting charge, in accordance with Well known practices in the explosives art.

The buffer element 48 plays an important part in this invention as it insures reliability in the operation of the device and aids materially in controlling the direction of force resulting from detonation of the explosive charge 50. It serves to buffer the force of the explosion of the explosive cutting charge and prevent shattering of the back-up annulus.

It is to be noted from FIG. 3 that the circular explosive cutting charge 50 does not extend through 360" so that a space is left between its

ends

54 and 56, and that roll bar 38 is positioned over this space. The purpose of this construction is to insure that the portion cut out by the explosive cutter remains attached to the patch plate or tank by a hinge portion. Detonators 58 are located adjacent the

ends

54 and 56, respectively, of the annular explosive cutting charge 50. Electrical lead wires extend out of the cutter through cable/connector assembly 42. The detonators 58 are conventional and operate to build up a detonation wave to initiate the explosive cutting charge 50 by end initiation.

Although the patch plate assembly described immediately above has been identified as one for cutting the lower or liquid outlet hole, it can also be used for cutting the upper or air inlet hole. In this latter application, of course, the actuation element 40 and associated circuitry would be superfluous.

A patch plate assembly for the upper or air inlet hole, as shown in FIG. 5, comprises patch plate 62 and upper explosive cutter 64 having its edge face secured to the patch plate as shown. The explosive cutter 64 is provided with an external annular flange portion 66 provided with vertically extending bolt holes 68. Patch plate assembly 16 is attached to upper container wall 70 over tank hole 71 by means of threaded bolts 72 passing through holes 68, gasket 75 and patch plate 62 and threadedly secured in internal annular tank boss 74. In this modification of the explosive cutter for the patch plate assembly for the air inlet hole, detonators 76 are positioned in wells 80, 180 apart, only one being shown. The explosive charge extends through 360 and two detonators are used for the purpose of redundancy. The explosive of the detonators may be lead azide or similar explosive. The lead-in wires 86 are encased in plastic 88 as shown.

The construction of annular groove 46, butter layer 48, explosive charge 50 and metal casing 52 in the upper explosive cutter is the same as that for the lower explosive cutter and will not be repeated. Corresponding elements of the two structures are indicated by corresponding numerals.

In FIG. 6 there is shown a schematic diagram of the circuitry connecting the event control switch with the circuitry for activating the detonators for the liquid outlet hole, and the circuitry by which the detonators for the air inlet hole are activated upon activation of the detonators for the liquid outlet hole and the consequent cutting of the tank portion to make the liquid outlet hole and the movement of this portion.

The operation of the above-described device will now be described. With the upper and lower patch plate assemblies in position over the upper and lower holes in the tank, respectively, the event control switch is operated by the pilot or other personnel to activate the detonators of the lower explosive cutter 24 to detonate the explosive cutting charge. The efiect of the detonation of the explosive cutter is to cut out portion 90 of the patch plate. As will be described later, this portion first moves inwardly against the incompressible liquid in the tank and then moves outwardly as shown in FIG. 2. Due to the fact that a space is left between the

ends

54 and 56 of the circular cutting charge 50, the portion'of the patch plate located adjacent the space between the

ends

54 and 56 will not be cut out so that the portion 90 remains connected to the patch plate by a hinge portion. The cut out portion 90 will contact and depress actuation button 40 as it travels outwardly around the roll bar 38. The effect of the roll bar is to insure that the portion 90 is not cut completely away from the patch plate and to provide for uniform tearing of the portion 90 along the edges of the hinge section in the direction of the center of the cut out portion.

As shown in FIG. 6 the outlet cutter sequencing switch or button 40 actuates the circuitry to activate the detonators of the upper explosive cutter for the air inlet hole which functions in the same manner to cut a hole in the patch plate 62 for the air inlet hole as does the explosive cutter 24 for the liquid outlet hole.

The described construction provides for sequential actuation of the lower explosive cutter for the fluid outlet hole and the upper explosive cutter for the air inlet hole, in that order. It will be seen that the firing circuit which activates the detonators for the upper explosive cutter for the air inlet hole can only be actuated by movement of cut out portion 90 for the liquid outlet hole after it has been cut out.

As shown in FIG. 6, the operation of the circuit to provide sequential actuation of the explosive cutters in the two patch plate assemblies is as follows: The circuit is shown in the safe condition with button 40 in its out- Ward position (normally closed). So long as the current flows through the sequencing switch of the liquid outlet cutter (after arming), the lockout relay will be activated to cut off the firing circuit to the air inlet cutter. When the event control switch is closed by the pilot or other personnel to admit current to the detonators of the outlet cutter and actuate the explosive cutter of the patch plate for the liquid outlet hole, the switch 40 will be actuated by the outward movement of the cut out portion 90 of the patch plate 22, cutting off current to the relay and thus permitting current to reach the detonators 84 of the air inlet cutter. This construction and operation insures sequential actuation of

detonators

58 and 84 with the result of sequential cutting of the lower liquid outlet hole in the bottom of the tank and the upper inlet hole in the top of the tank in that order.

Experimentation has proved that the cut out portion 90 for the liquid outlet hole moves outwardly rather than inwardly after the explosion and the explanation is as follows: When the explosive of the cutter is detonated a pressure is created at the face of the liquid which forces the cut out portion outwardly since liquid is incompressible. The same effect is not achieved with the small cutter, as by the time it is sequentially initiated some liquid has left the container and the cut out portion will move inwardly.

The invention has been described by its application to a container mounted on an airplane; however, it is not limited to this application as it can be used in any application where sequential cutting is required. The invention has been illustrated with the use of two detonators in the explosive cutters, but it is not limited to such use as one or more detonators may be used, two detonators being preferred for purposes of redundancy. The invention is not restricted to the use of the non-metallic buffer element in the explosive cutter, but the use of this element is preferred. In the claims, when the cutters are referred to as being located on the container or tank, this language includes location of the cutters either on the patch plate or on the tank itself. The firing circuit illustrated and described is, of course, conventional and optional as other conventional firing circuits may be used.

The invention includes one or more explosive cutters, including a roll bar, with or without patch plates, and with or without adapters. It also includes the combination of one or more explosive cutters including a roll bar, with or without patch plates, in cooperative relationship with one or more patch assemblies, with or without roll bars or adapters.

It is, therefore, to be understood that various modifications and changes may be made in the constructionand arrangement of parts of the present invention without departing from the spirit and scope thereof as defined by the appended claims. Insofaras these changes and modifications are within the purview of the annexed claims, they are to be considered a part of this invention.

What is claimed is:

1. Apparatus for rapidly voiding containers of fluids comprising: at least a first explosive cutter to be located at a first position on a container for cutting out a first portion thereof; activating means for said first explosive cutter; at least a second explosive cutter to be located at a second position on said container for cutting out a second portion thereof; activating means for said second explosive cutter; at least one of said explosive cutters operative to partially cut out its respective portion to leave the portion attached to said container by a hinge portion; and actuating means operative by movement of said respective cut out portion for actuating the activating means for the other explosive cutter.

2. The apparatus of claim 1 in which at least one of said explosive cutters includes an explosive cutting charge and a space exists between the ends of said explosive cutting charge.

3. The apparatus of claim 1 in which roll bar means is mounted in at least one of said explosive cutters.

4. The apparatus of claim 2 in which roll .bar means is mounted in at least one of said explosive cutters at a position corresponding to the location of said space.

5. The apparatus of claim 4 in which said roll bar means carries actuation means for activating the other explosive cutter.

6. The apparatus of claim 1 in which at least one of said explosive cutters is mounted on a patch plate with the cutting charge adjacent the patch plate.

7. The apparatus of claim 6 in which an adapter is associated with at least one of said patch plates for mounting the patch plate on the container wall.

8. The apparatus of claim 6 in which at least one of said explosive cutters includes an explosive cutting charge and a space exists between the ends of said explosive cutting charge.

9. The apparatus of claim 6 in which roll bar means is mounted in at least one of said explosive cutters.

10. The apparatus of claim 9 in which said roll bar means carries actuating means for activating the other explosive cutter.

11. The apparatus of claim 8 in which roll bar means is mounted in at least one of said explosive cutters at a position corresponding to said space.

12. Apparatus for sequentially cutting holes in a container comprising: a first explosive cutter to be located at a first position on a container for partially cutting out a first portion thereof to leave said first portion attached to said container by a hinge portion; said first explosive cutter being in the form of an annulus incorporating an explosive cutting charge with a space between the ends of the cutting charge and having a roll bar mounted therein at a position corresponding to that of said space; activating means for said first explosive cutter; a second explosive cutter to be located at a second position on said container for cutting out a portion thereof; activating means for said second explosive cutter; and actuating means operative by movement of said first cut out portion for actuating the activating means of said second explosive cutter.

13. The apparatus of claim 12 in combination with a container and the explosive cutters being located on said container.

14. The apparatus of claim 12 including a patch plate attached to at least one of said explosive cutters adjacent the explosive cutting charge of the cutter.

15. The apparatus of claim 14 in combination with a container and the patch plate being located on the container.

16. The apparatus of claim 12 in which said second explosive cutter is in the form of an annulus incorporating an explosive cutting charge with a space between its ends.

17. The apparatus of claim 15 in which a roll bar is positioned in said second explosive cutter at a position corresponding to that of said space.

18. The apparatus of claim 1 in combination with a container and the explosive cutters being located on the container.

19. A patch plate assembly for mounting on an element to cut a hole therein comprising: a patch plate; an explosive cutter including a heavy metal annulus having an annular groove in its bottom edge facing outwardly; a concave explosive cutting charge positioned in said groove with a space between the ends of the explosive charge and with its concave surface facing out wardly; a concave metal lining on said concave surface conforming thereto; said explosive cutter being mounted on said patch plate with the cutting charge of the cutter adjacent the patch plate; said explosive cutter being operative to cut out a portion of said patch plate leaving the cut-out portion of the patch plate attached thereto by a hinge portion; and activating means for said explosive cutter including at least one detonation train for detonating said explosive charge.

20. The assembly of claim 19. in which roll bar means are positioned inside said annulus at a position corresponding to that of said space.

21. A patch plate assembly for mounting on an element to cut a hole therein comprising: a patch plate; an explosive cutter including a heavy metal annulus having an annular groove in its bottom edge facing outwardly; an annular concave explosive cutting charge positioned in said groove with its concave surface facing outwardly; a concave metal lining on said concave surface conforming thereto; an annular back-up layer of non-metallic material positioned between the bottom of said annular groove and said explosive charge; said explosive cutter being mounted on said patch plate with the cutting charge of the cutter adjacent the patch plate; and activating means for said explosive cutter including at least one detonation train for detonating said explosive charge.

22. Apparatus for cutting a hole in an element and leaving the cut-out portion attached to the element comprising: an explosive cutter including a heavy metal annulus having an annular groove in its bottom edge facing outwardly; a concave explosive cutting charge positioned in said groove with a space between the ends of the explosive charge and with its concave surface facing outwardly; a concave metal lining on said concave surface conforming thereto; activating means for said explosive cutter; said explosive cutter constructed to be mounted on said element with the cutting charge of the cutter adjacent the element and being operative to cut out a portion of said element leaving the cut-out portion of the element attached thereto by a hinge portion.

23. The apparatus defined in claim 22 including a means positioned inside said annulus at a position corresponding to that of said space for insuring that said hinge portion will be left between said cut-out portion and said element.

24. The apparatus defined in claim 22 for cutting a hole in an element and sequentially actuating associated apparatus by movement of the cut-out portion of the element and including:

an actuating means for said associated apparatus, said actuating means being operative in response to motion of said cut-out portion to actuate sa1d associated apparatus whereby said associated apparatus is sequentially actuated by movement of said cut-out portion after it has been cut out.

25. Apparatus as defined in claim 24 including a means positioned inside said annulus at a position corresponding to that of said space for insuring that said hinge portion will be left between said cut-out portion and said element.

References Cited UNITED STATES PATENTS 2,408,774 10/ 1946 Goddard et a1 222-81 X 2,474,826 7/1949 Cantlin 222-5 X 2,989,381 6/1961 Musser 222-5 X 3,191,533 6/1965 Hopson 222-5 X SAMUEL F, COLEMAN Primary Examiner.

Claims

1. APPARATUS FOR RAPIDLY VOIDING CONTAINERS OF FLUIDS COMPRISING: AT LEAST A FRIST EXPLOSIVE CUTTER TO BE LOCATED AT A FIRST POSITION ON A CONTAINER FOR CUTTING OUT A FIRST PORTION THEREOF; ACTIVATING MEANS FOR SAID FIRST EXPLOSIVE CUTTER; AT LEAST A SECOND EXPLOSIVE CUTTER TO BE LOCATED AT A SECOND POSITION ON SAID CONTAINER FOR CUTTING OUT A SECOND PORTION THEREOF; ACTIVATING MEANS FOR SAID SECOND EXPLOSIVE CUTTER; AT LEAST ONE OF SAID EXPLOSIVE CUTTERS OPERATIVE TO PARTIALLY CUT OUT ITS RESPECTIVE PORTION TO LEAVE THE PORTION ATTACHED TO SAID CONTAINER BY A HINGE PORTION; AND ACTUATING MEANS OPERATIVE BY MOVEMENT OF SAID RESPECTIVE CUT OUT PORTION FOR ACTUATING THE ACTIVATING MEANS FOR THE OTHER EXPLOSIVE CUTTER.