JPH0246557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a detonator which operates by firing a low energy detonating cord into a detonator tube.
Relates to a device for connecting so as to be detonated.
The invention is also used for the non-electrical detonation of explosives that are not sensitive to detonators and is particularly useful for the delayed detonation of deck-loaded explosives with a single detonator cord downline. A primer containing such a device for
Regarding assemblages.

Description of the Prior Art In blasting operations in which detonator-insensitive explosives are non-electrically detonated within the borehole itself at predetermined delay time intervals, detonator-sensitive high-energy detonators (sometimes referred to as "boosters") are commonly used. ) and non-electric delayed detonators,
It is necessary to use a device that connects the detonator in operative relation to the detonator and to the lower wire of the detonator cord. In such explosive deck loading techniques, which are often used when eliminating excessive vibrations is an important consideration,
Detonator-insensitive explosives are loaded into bored holes in the deck separated from each other by layers of inert plugging material. If this technique is used, each deck must have a detonator (e.g.
A detonator connected to act on the detonator) is required. A detonator is connected within the detonator to act on the lower line cord. A system in which the detonators in all decks are connected by a single lower line is preferable to a system in which an individual lower line is required for each detonator. This is because the underline system is less complex and easier to load and connect the drilled hole.

U.S. Pat. No. 3,709,149 discloses a delayed booster assembly in which a percussion actuated delayed detonator is seated within a recess formed in a cylindrical booster perpendicular to the longitudinal axis of the cylinder. It shows. A detonator cord extends longitudinally of the booster, ie, perpendicular to the detonator, through a loop member at the working end of the detonator and a cord tunnel member strapped to the booster cartridge. The detonator is actuated by the detonation of a charge that responds to the impact produced by the detonation of the cord. In one embodiment, a single lower wire cord extends through a loop member on the detonator in a multiple booster assembly. One of the disadvantages of the Driscoll booster assembly is that vertically arranging the detonators requires a booster with a diameter large enough to accommodate the full length of the commonly used delayed detonators. That's true.

In the delayed booster assembly described in U.S. Pat. has been done. Multiple boosters are threaded through the detonator cord tunnel and are attached to the side of the booster or with a common 5-6 bomb enclosed inside the booster case.
Slide on the lower line detonator cord of g/m. The detonation cord tunnel is surrounded by a buffer member.
The system includes, in addition to the lower wire cord, a second cord, e.g., one low-energy detonator cord ( LEDC) is required. The shock-sensitive sensor attached to one end of the LEDC is a metal cartridge containing an explosive charge positioned with its lower end adjacent to the lower wire cord.
The other end of the JEDC is crimped to the open end of the detonator case. Therefore,
This detonator is not a self-contained, separate unit suitable for field assembly, but must be loaded and handled in a delayed insert assembly together with the fire sensitive sensor and signal carrier cord, e.g. It is housed in an L-shaped plug that seals the cartridge.

According to U.S. Pat. No. 4,295,424, a delayed detonator in a unit also equipped with a detonator (a small charge) and a passive radiator (a flexible L-shaped hollow tube) is It must be widely isolated, and this passive radiator provides this isolation. This detonator is
The lower line cord conduit is located outside the booster container near the edge of the booster diametrically opposed to the lower wire cord conduit.

In the delayed booster assembly shown in Austin Technical Bulletin No. ADP 1183, entitled "Austin Delay Boosters," published by Austin Powder Company, Cleveland, Ohio, the booster container has an outer lower line channel and a basic and an axial delay channel. An elongated delay element in the form of a delayed detonator with the end of a pigtail cord crimped into the cartridge case is used.
The detonator is seated in the delay channel and the pigtail cord is inserted into the lower wire channel. This lower wire is threaded through the lower wire channel and adjacent to the internal pigtail cord thereby interrupting the detonating impulse from the side output of the lower wire to the detonator.

SUMMARY OF THE INVENTION The present invention provides low energy detonation cords (LEDCs).
(a)
A substantially cylindrical detonator, for example cast, optionally having a roll of paper, cardboard or similar packaging material with or without a terminal cap, or held in a plastic container. said detonator has a detonator-receiving recess substantially parallel to its longitudinal axis and 2 has a cord-receiving hole therethrough, for example, or an outer cord-receiving tubular conduit or an aligned multiple outer constituting or combined with a device having a hole for passing the LEDC on an axis substantially parallel to the recess at a location spaced from the recess having a packaging member or container with a conduit or ferrule; and (b) a detonator seated within said detonator storage recess and having a percussion-sensitive ignition charge at its working end; and (c) a shock-sensitive coupling charge of the detonator, e.g. , an explosive coupler with a plastic connecting block for storing lead azide powder in linear elongated rows in the holes, said explosive coupler having a structure in which the explosive in said holes is perpendicular to said detonator. and (2) a device for passing the LEDC, the device being disposed near the pyrotechnic charge so as to detonate the pyrotechnic charge responsive to the firing of the detonator, and (2) passing the LEDC;
For example, a cord storage hole, i.e. an LEDC passed perpendicular to and through the conduit opening.
the distance between the charges in a detonator assembly mounted on said detonator and threaded with a cord in such a manner that the detonator can be detonated by detonation of said detonator and the inert material between the detonators; Provided is a detonator assembly in which the energy output and sensitivity of the explosive are such that the detonator is detonated by the detonator as a result of a detonating impulse from the detonator cord being transmitted to the detonator through the detonator coupler. It is something.

Preferably, within the assembly on the plastic connecting block there is provided the detonator as necessary for placing the detonator within the detonator receiving recess in the requisite proximity to the explosive coupler fitted with the ignition charge responsive to its firing. held in position and passed through the detonator's through hole.
A device is provided for directing the LEDC to pass at the required closeness to the attached explosive coupler.

A preferred detonator assembly of the present invention is a detonator coupler also provided by the present invention for operably connecting a low energy detonating cord (LEDC) to a percussion actuated detonator, comprising: (a) a shock-activated detonator; A plastic coupling block is provided which receives a coupling charge of a sensitive detonator, e.g., powdered lead azide, in a linear elongated array within an internal hole, said hole containing (1) a linear coupling charge; (2) completely covered by a thin closure membrane adapted to retain the housing for the coupling charge; or (2) at least partially by a locking device adapted to place the housing cartridge in the desired position. (b) the coupling charge is held perpendicular to the detonator and in close proximity to the detonator to detonate the pyrotechnic charge responsive to a strike of the detonator; The actuating end houses an explosive coupler with a detonator engagement device on a plastic connecting block adapted to engage a detonator having a percussion-sensitive ignition charge.

In a further preferred coupler, the connecting block has a cord receiving hole on a longitudinal axis perpendicular to the longitudinal axis of the hole and parallel to the detonator with which the connecting block comes to engage. and the hole in the coupling block is (a) arranged coaxially with the cord passage hole in the detonator to which the coupler is attached, and (b)
adjacent to a closing or locking device of the coupling block hole so that the LEDC passed through the hole is directed to be passed close enough to the coupling charge in the hole to detonate the coupling charge; There is.

A preferred connecting block also provided by the invention for use in the explosive coupler of the invention is a substantially L-shaped plastic member having vertical first and second arms of substantially tubular configuration. The first arm is equipped with:
having an open passageway adapted to pass the LEDC, and said second arm preferably receiving a coupling charge held in a closed cartridge case and being arranged in a linear, elongated manner and carrying said coupling charge.
It has a hole adapted to hold the LEDC adjacent to the passageway of the first arm. The second arm of the connecting block engages the detonator actuated by the percussion, thereby causing (a) the detonator to
(b) an igniting charge responsive to firing of the detonator linearly disposed within the hole therein; It is designed to be kept close enough to detonate the coupling charge, which is now arranged in a long and narrow array.

The term "proximity to detonation," as used herein to refer to the relative placement of the coupling detonator charge and the percussion-sensitive ignition charge in the detonator, refers to The detonation of the coupling charge therein indicates the proximity of the detonator to the detonator.

The accompanying drawings illustrate certain embodiments of the detonator assemblies, detonators, explosive couplers, coupler/initiator assemblies of the present invention.

DETAILED DESCRIPTION The detonator assembly of the present invention comprises: (1) a detonator, i.e., a cast, usually lightly rolled paper or cardboard, optionally capped at the end or held in a plastic container; (2) a detonator seated within the recess of the detonator, and (3) the detonator placed in a bore in the detonator or in a conduit outside the detonator. It is equipped with an explosive coupler having a connecting block that houses an explosive to be connected to the LEDC to be detonated. A preferred detonator assembly is shown in FIG. The connecting blocks of the assembly of FIG. 1 are shown as separate elements in FIGS. 2 and 3. The detonator storage recess and cord storage hole of the detonator can be lined with paper.

In the detonator assembly shown in FIG.
is typically a substantially cylindrical detonator charge formed from a cast explosive 1a of the type commonly used for high energy detonators, such as the detonator charge described in U.S. Pat. No. 4,343,663. It is. The detonator 1 has a light surrounding wrapping element 2, for example a cardboard tube. Explosive charge 1a is cast into this cardboard tube. The detonator 1 has an opening or hole 3 extending parallel to or coincident with the longitudinal axis of its cylindrical body. Since the detonator 1 is provided with the hole 3, it constitutes a device having a hole through which the LEDC passes. The detonator 1 is also formed with two recesses, namely a recess 4 for accommodating a detonator isolated from the hole 3 and extending parallel to the hole 3 and closed at one end, and adjacent to the hole 3 and the recess 4. A recessed portion 5 is provided. The recess 5, together with the hole 3, accommodates a connecting block 7 in an explosive coupler for detonatingly connecting one LEDC passed through the hole 3 to a detonator seated in the recess 4. formed into a shape. Around hole 3 and adjacent to recesses 4 and 5, sensitive to the detonator
A tubular mass 6 of a rubber-like extruded mixture of PETN and an elastomer binder is arranged. The tubular agglomerate 6 is described in the aforementioned U.S. Pat.
It constitutes a small booster that can be used advantageously with the detonator explosive described in US Pat. No. 4,343,663.

The aforementioned connecting block, generally designated 7, is a rigid plastic member having a substantially L-shaped configuration (see FIG. 2). One L-shaped arm 8 having a substantially tubular shape is inserted into the bore 3 of the detonator 1 . (Figure 1)
The arm 8 has an open passage 9 communicating with the hole 3 so that the LEDC can be passed through the hole 3 when the arm 8 is placed in position within the hole 3. The wall of the arm 8 is longitudinally divided to form spaced edges 37 and 38 and is provided with three rows of suitably angled circumferential spikes 39a, 39b and 39c. There is. The spikes 39, 39b and 39c serve as a gripping device that allows the arm, i.e. the stem 8, to be inserted into the hole 3 and to grip the wall surrounding the rubber-like explosive tube 6; When the assembled detonator is lowered into the hole, the force generated causes the connecting block 7 to move into the detonator 1.
prevent withdrawal from passed through hole 3
When the LEDC detonates, the spikes 39a, 39
b, 39c are driven into the wall of the explosive tube 6 and thereby prevent the coupling block 7 from being ejected from the detonator 1 as a result of detonation of the LEDC or the explosive coupling charge. Retention of this connecting block is important because connecting block 7 ignitably connects the LEDC to delayed detonator 19 via explosive coupler element 12. Retention of the connecting block and the detonator can also be assisted by a segmented arm 8. The divided arm 8 faces the detonator 19 and transfers the explosive energy to the tube 6 between the divided arm 8 and the detonator 19.
This makes it possible to preferentially transmit information to that part. The other arm 10 of the connecting block 7, which is perpendicular to the arm 8 attached to the connecting block 7, forms part of an explosive coupler containing the coupling charge. When the arm 8 of the coupling block 7 is in position in the hole 3, the arm 10 and the coupling element 12 are inserted into the detonator storage recess 4.
and perpendicular to a percussion actuated detonator 19 seated therein. The detonator 19 is
It is engaged with arm 10 as explained below.

The explosive coupling element 12 is integrally constructed and closed at one end 13a and contains a coupling charge 14 of an impact-sensitive detonator made of metal, for example lead azide powder. It consists of 13 cartridges. The cartridge case 13 is made of plastic which ends at a shorter length than the integrally constructed closed end 13a and whose edges are beveled to facilitate the flow of explosive powder during loading into the cartridge case. A lining pipe 15 is housed therein.
The open end of the cartridge case 13 is sealed with a spherical plastic plug 16. Explosive powder 14 is stored in the hole of the tube 15 and (a) the space between the end of the tube 15 and the small end 13a and (b) the space between the other end of the tube 15 and the plug 16. has been done.

The initiating coupling element 12 is seated within the bore 11 of the block arm 10, as shown in FIG. The bore 11 is partially closed by a pair of locking devices 17 consisting of flat and tapered areas at its ends, as can be seen in FIG. A locking device or hole closure member 17 is located adjacent to the passageway 9. A slot 45 is installed in the end wall of the connecting block 7.
Due to the formation of the locking device 17 and the passageway 9, an opening or slot 49 is formed. (See description below) Therefore, when the coupler cartridge 13 is pushed into the bore 11 and supported opposite the locking device 17, its bottom end 13a is attached to the locking device 17. It faces the passageway 9 through the opening 49 .

To complete the explosive coupling of the LEDC to the detonator 19, the arm 10 of the connecting block 7 is
includes a pair of opposed extension members 20 and 21. The extension members 20, 21 together with the surface portion 22 of the arm 10 hold the detonator 1 between them.
9 forming a substantially U-shaped channel 23 for sliding engagement. extension members 20 and 21 are arranged in a plane parallel to the plane in which the longitudinal axes of both arms 8 and 10 are arranged;
The end edges of extension members 20 and 21 are directed inwardly toward each other to form lips 24 and 25, respectively.

Extension members 20 and 21 on arm 10 extend beyond arm 8 to form a pair of opposed walls 40 and 41. Walls 40 and 41
together with the end face 42 forms a collar around the arm 8. The portions of extension members 20 and 21 forming walls 40 and 41 are wider than the remaining portions. An additional feature of the connecting block 7 is that it has slits or grooves 43 and 44 formed along its side walls and a slot 45 in its adjacent end wall.

The detonator 19 is a detonator activated by bombardment,
For example, an initiator of the type described in U.S. Pat. No. 4,429,632, the disclosure of which is incorporated herein by reference. That is, the detonator 19 is closed at one end 26a integrally configured, and includes, in order from the end 26a, a base charge 27 made of a detonator composition and a detonator device made of a heat-sensitive detonator composition. It is provided with a tubular metal detonator cartridge 26 containing a charge 28 and a delayed charge 29 consisting of an exothermic combustion composition. A delayed charge 29 is pressed into a plastic capsule 30, and a metal capsule 31 is seated inside the capsule 30 opposite the delayed charge 29. Capsules 30 and 31 both have one open end and a closure member at the other end with an orifice therethrough, i.e. the closure member includes charges 28 and 2.
He is seated facing 9.

The detonator cartridge 26 is closed by a primer cartridge 32, in this case an ignition assembly comprising a rifle cartridge casing with an empty primer that ignites at the rim. The detonator cartridge 32 has an open end and an integrally constructed closed end 32.
It has a. The end portion 32a has a detonator charge 3 on its inner circumferential surface that is sensitive to firing for ignition of the rim.
I support 3. The flame-sensitive igniter charge 34 loaded loosely into the metal capsule 31 is replaced by the percussion-sensitive detonator charge when the detonator 19 is tipped over for insertion into the recess 4. 33. Detonator cartridge 32
has circumferential folds 35 in the detonator cartridge 26.
and held by 36.

When the detonator 19 is to be engaged with the channel 23, the detonator, with the percussion cap end 32a supported by the portion 22a of the surface 22, is slid into the channel 23 at the adjacent free end faces of the extension members 20 and 21. Lips 24 and 25
grips the circumferential folds 36. detonator 19
is slidable along the channel 23, which allows the connecting block to be used with detonators having different spacing between the recess 4 and the LEDC receiving hole or conduit. lip 24
25 and the width of the pleats 36, the detonator can be moved slightly in the direction of its longitudinal axis, which is due to the detonation of the coupling charge, as will be explained below. It may even be advantageous to facilitate retaining the detonator in the detonator during detonation.

Once the coupler 12 is seated in the bore 11 and the detonator 19 is engaged in the channel 23, the connecting block 7 is ready to be placed into the detonator 1. Detonator 19 is arm 8
The arm 8 is inserted into the hole 3 while being held at the required distance from the hole 3.
and the detonator 19 enters the recess 4. Walls 40 and 41 and end surface 4
The connecting block 7 is pushed into the recess 5 until the leading edge of the collar formed from 2 abuts the end of the tube 6, so that the connecting block 7 is placed completely within the boundaries of the recess 5. Extension members 20 and 2
1 is wider in the collar part than in the part which engages the detonator 19, so that a small distance is provided between the lips 24 and 25 and the edge of the recess 5 against which the collar abuts. This interval, groove 43
and 44 and slot 45 are provided to facilitate retention of the detonator in the detonator during detonation of the coupling charge.

The detonation is captured by the explosive charge 14 when the LEDC is passed through the passageway 9 adjacent the hole 3 and the bottom of the cartridge 13 containing the explosive charge and the detonator 19 deflagrates. The connecting block 7 is designed so that the detonator 19 remains in place in the recess 4 when required and is not ejected therefrom by detonation of the explosive charge 14.

Due to several features, the detonator can be released from the connecting block 7 and remain in place when the explosive is deflagrated, the spacing between the detonator channel 23 and the edge of the detonator recess; Due to the aforementioned slight mobility of the detonator in the direction parallel to the hole 3 and the thin and slightly deflecting nature of the lips 24 and 25, the connecting block 7 moves out of the detonator during detonation of the explosive charge. do. Also, the connecting block 7 can tear along grooves 43 and 44 and slot 45 during detonation of the coupling charge, thereby preventing ejection of the detonator.

In the detonator assembly shown in FIG.
has a plastic jacket or sheath 2. The jacket 2 closes off the end of the detonator and delimits the recess 5. The jacket 2 has two access holes in the part lining the recess 5, one hole adjoining the hole 3 and the other hole adjoining the recess 4. The recess of the jacket 2 has a protruding rib 47. The ribs 47 constitute part of the textured surface arrangement which attaches the connecting block 7 of the explosive coupler to the detonator 1.

In this detonator assembly, connecting block 7
is basically the block 7 of FIGS. 1, 2 and 3 without the arm 8 and without the extension members 20 and 21. Grooves 43 and 44 and slot 45 are
4 (one of these grooves 54 is shown in FIG. 4). Opening 48, which is part of passageway 9 in FIG. 1, retains a block located within arm 10. This block is the first
Like the arm 10 of the block shown, it houses an initiating coupling element 12. Block 7 in FIG. 4 is not equipped with a device for engaging the detonator;
It also does not have a stem part to attach the block. In this arrangement, the detonator 19 is seated in the recess 4 and the block 7 is attached to the jacket 2 in the recess 5 by a concave-convex connection made by the connecting rib 47 of the jacket 2 and the groove of the block 7. It is held as close as necessary to the coupling charge 14 when secured. By fixing the block 7 to the detonator 1 in this way, since the opening 48 is provided in the block 7,
A means is provided to hold the LEDC in proper relationship for detonation with the coupling charge 14.

Unless recess 4 is longer than detonator 19 and detonator 19 is not previously engaged with the connecting block of FIG. A locking device is required to seat the detonator 19 with the end face of the cartridge 32 exposed so as to be able to impact the cartridge casing 32. To do this, the end of the cartridge 26 of the detonator 19 is flared circumferentially outward to form a flange 26b. Flange 2
6b prevents the detonator 19 from entering further into the recess 4.

In another arrangement of the invention shown in FIG. 5, the cord passage hole 3 is an open conduit in a tubular member 18 located outside the detonator 1. Recess 4
and 5 are formed in a similar manner to the assembly of FIG. The connecting block 7 forms an integral unit with the tubular member 18 and the wider sections 40 and 41 of the extension members 20 and 21 connect the detonator 1 in the recess 5.
is fitted into the recess 5 so as to be in contact with the opposing surface of. As in FIG. 1, the coupling element 12 is placed in the bore 11 such that the coupler cartridge 13 is supported by the locking device 17, and the cast bottom end 13a of the cartridge 13 is locked. It faces the opening 3 of the tubular member 18 through an opening in the stop device and an opening in the wall of the tubular member 18 . Lips 24 and 25 of extension members 20 and 21 engage initiator 19 by gripping circumferential pleats 36, respectively. Block 7 is seated within recess 5 as shown, thereby locating detonator 19 within recess 4 and tubular member 18.
are placed side by side on the wall of the detonator. This assembly is held in place by closing the circumferential straps 55. Circumferential strap 55
is suitably attached to tubular member 18, for example, by being molded with or threaded through a slot in tubular member 18.

In FIG. 6, numeral 50 designates a closure cap which is placed over the end of the detonator and is held in place by an interference fit. This closure cap can be used with any cylindrical detonator having a detonator receiving recess 4 and a cord receiving hole 3 (as in FIG. 1). Block storage recess 5 is unnecessary. A closing cap 50 made of plastic, for example, forms an integral unit with the connecting block 7, and the end of the cap 50 is provided with an approximately central hole 51. The hole 51 is coaxial with the opening 48 of the block 7 and coaxial with the cord receiving hole 3 of the detonator, in which the closing cap 50 is mounted. hole 11
is adapted to receive the coupling element 12 through an access opening 52 in the side wall of the closure cap 50. When the coupling element 12 is placed in position in the bore 11, the coupler cartridge 13 is supported by the locking device 17 (as in FIG. 1) and the cast bottom side of the cartridge 13 is The end 13a faces the hole 48 through the opening of the locking device (as in FIG. 1). The support ribs 53 are disposed within the recess 4 of the detonator 19 to provide strength to the cover/coupler assembly when it is in position over the end of the detonator.

The connecting blocks shown in FIGS. 7 and 8 are
It is essentially the connecting block shown in FIG. 4 with a device for engaging and holding the detonator in place. The detonator engagement device 56 is essentially a box-shaped mounting member having a thin closed top with a central hole 57 and a pair of diametrical slits 58a, 58b extending from the hole 57. It is. The detonator 19 is pushed into the mounting member 56 through the bendable hole 57. Hole 57 serves to grip pleats 36 of detonator 19. The coupler/initiator assembly is inserted into the empty recesses 4 and 5 shown in FIG. 4 and secured in place by a concave-convex connection.

The detonator assembly of the present invention is adapted for use in igniting detonator-insensitive explosives by means of a detonating impulse provided by a low energy detonation cord (LEDC). The detonator cord is adapted to have a detonator assembly extending, for example, into a deck-loaded borehole with other such assemblies spaced at predetermined intervals. This LEDC has a sufficiently low explosive core loading, i.e. only about 2g per meter of cord length.
It has a charge capacity of up to 10,000 yen, so it does not directly detonate or interfere with the explosive to be ignited, and it does not directly detonate the detonator charge and the detonator in the detonator, as is the case with heavier cords. There is no need for large boundaries to avoid the detonator, nor is there a need for wide separation from the detonator in the detonator charge or detonator in the detonator. At the same time, the side energy output of the detonating cord is large enough to detonate the coupling charge adjacent to the detonating cord. A preferred code is described in US Pat. No. 4,232,606, the disclosure of which is incorporated herein by reference. The cord has a solid core of a deformable bonded priming composition comprising a crystalline high explosive compound, preferably very fine PETN, mixed with a binder. The charge of this crystalline explosive is at least
Should be 0.1g, preferred loading is 1m
The amount is within the range of about 0.2 to 1.0 g. If the loading of the explosive core at the upper end of the LEDC is, for example, about 2.0 g per meter or more, a suitable boundary, e.g. at least
A 0.16 cm thick polyethylene sheath must be placed around the explosive core. A suitable boundary is
It can also be provided in the detonator itself, for example as a lining tube in the bore 3 or in the passage 9 of the arm 8 of the block. The codes described in U.S. Pat. No. 3,125,024 also e.g.
Granular PETN cores can be used at a loading of about 0.7 to 1.0 g per meter. Granular explosive core trapped inside a metal tube
LEDCs can also be used (U.S. Patent No.
(See No. 2982210).

The device for passing the LEDC through the detonator assembly can be either a hole through the detonator itself (as in Figures 1 and 4) or a tubular body attached to the detonator (as in Figure 5). It can be a conduit or a conduit in a plastic container for the detonator. It is preferred to pass the cord through a hole in the detonator itself, since there is no need for significant separation between the cord and the detonator. Most preferably, the cord receiving hole is located substantially on the longitudinal axis of the detonator. The reason for this is that this arrangement provides a better balance of the detonator assembly and allows multiple detonators to be placed in a common position when loading into a bored hole.
This is because it becomes easier to slide it onto the lower line of the LEDC.

In another arrangement, which is advantageously used when the LEDC has a lightly confined explosive core in the charge section at the upper end of the range of the LEDC, the detonator is threaded outside the explosive body, e.g. , through an outer conduit of a plastic tube or container or a ferrule attached to an array of outer conduits or a plastic container.
This embodiment allows for isolation of the cord from the detonator charge and maximum isolation of the cord and the detonator to prevent fragmentation of the detonator charge or damage to the detonator or premature detonation.

Although the detonator receiving recess can extend completely through the detonator, it is typically a detonator hole that extends only partially. The detonator receiving recess extends substantially parallel to the longitudinal axis of the detonator and substantially parallel to the longitudinal axis of the cord receiving hole or conduit. The required spacing between the detonator receiving recess and the cord passage hole or conduit will depend on the side energy output of the cord and will depend on the construction of the detonator. Larger spacing is required for cords with higher energies to prevent a given detonator from deflagrating directly by the side output of the cord by bypassing its late charge. For the preferred LEDC, i.e. the code described in Example 1 of said US Pat. If the space is filled with detonator explosive and the detonator's igniting charge, usually lead azide, is housed in a standard detonator cartridge of type 5052 aluminum alloy, e.g. 0.4 mm thick. It is preferable to maintain a spacing of at least 1.5 mm.
In the case of a typical cast pentrime detonator, the detonator assembly of the present invention has a cord-to-detonator ratio of approximately 3.2 g/m for the 0.5 g/m cord described above.
It showed good performance when separated by mm. If the detonator charge, i.e. 1a of FIG. 1, is too hard to conveniently grip the connecting block as shown in FIG. 1, then a more flexible lining tube, e.g. 6 can be used around the cord hole.

The detonator used in the detonator assembly of the present invention is:
The detonator is actuated by the percussion force exerted by the detonation of a coupling charge (designated 14 in FIG. 1) arranged substantially perpendicular to the detonator. A detonator having an actuating end as described in US Pat. Nos. 4,429,632 and 3,709,149 can be used. These detonators are closed at their working ends by a partially empty tubular metal primer cartridge. The detonator case supports a percussion-sensitive detonator charge adjacent the inner surface of the completely closed end. This closure member is, for example, a rifle cartridge casing that fires at the rim with an empty primer or fires at the center.

A low energy detonator cord and a percussion actuated detonator are coupled in operative relationship by a detonator coupler in the detonator assembly of the present invention. In this explosive coupler, a coupling charge of an impact-sensitive detonator is inserted into a hole in a substantially tubular plastic connecting block attached to a detonator (i.e., a detonator charge or a terminal cap or container for a detonator charge). is housed in a linear elongate manner so that the coupling charge is oriented substantially perpendicular to the detonator. The coupling charge is also placed perpendicular to the cord and captures the detonation from the cord, increases the detonation energy level, and exerts sufficient radial percussion force to cause the detonation in the detonator. It is designed to selectively detonate sensitive charges. The hole in the coupling block can be completely closed, for example by a thin plastic membrane, so that the coupling charge can be loaded directly into the hole and retained therein, depending on the position of the closing member and the detonator. The connecting block is installed in such a way that the closing member faces the LEDC passed through the cord passage hole of the detonator. In such cases, the block containing the explosive itself is the coupling element. However, it is preferred to use self-contained coupling elements, such as sealed plastic or metal cartridges containing a coupling charge. Such coupling elements are more easily adapted to manufacture in commonly available loading equipment and can be placed into coupling blocks to form explosive couplers in the factory or in the field.

If the coupling charge is contained within a coupler case that is completely closed at one end and sealed with a plug at the opposite end, and the case is seated within a hole in a connecting block, the may be partially closed, e.g. by a projecting member or similar device, e.g. narrowed or otherwise reduced, or completely closed, e.g. by a thin plastic membrane, thereby closing the completely closed end of the cartridge. It can be supported by the resulting locking device, which will face the LEDC which is threaded through the cord passage hole of the detonator to which the connecting block is attached. As a result, the coupling charge in the bore or cartridge can be detonated by cord detonation.
Can be placed close enough to the LEDC.

In the detonator assembly of the present invention, a percussion actuated detonator is seated within a recess in the detonator and couples the coupling charge in the connecting block to an extent that causes the detonation of the ignition charge responsive to the detonator percussion. It is held in the required position for placement near the pyrotechnic charge. This is such that the connecting block houses the detonator engaging device which is brought into engagement with the detonator, thereby allowing the required positioning to be achieved by interlocking the elements or surfaces of the connecting block and the detonator. Preferably, this is done by using the explosive couplers of the invention. One such coupler is shown in Figure 1.
This is shown in FIGS. 2 and 3. In these cases, the channel member of the connecting block engages the circumferential folds of the detonator cartridge. This particular channel member allows the detonator to slide, thereby allowing the coupler to be used with detonators having different spacings between the detonator and the cord hole or conduit. However, if desired, the detonator can be engaged at a predetermined location on the connecting block, as shown in FIGS. 7 and 8. The coupler/detonator can be assembled in the factory or in the field.

Another method of holding the detonator in place in the recess is to form the recess itself with a corresponding contour or to add a circumferential flange to the end of the detonator case, as shown in FIG. to prevent the percussion actuated end from retracting too much into the detonator receiving recess thereby preventing proper contact with the explosive coupler. If desired, a mounting member can be suitably arranged on the end of the detonator to place the detonator into the recess 4 when required. These alternative methods will place the coupling charge in the required proximity to the igniting charge that is sensitive to the firing of the detonator in the recess of the detonator when the coupler is attached to the detonator.

A preferred apparatus for attaching the explosive coupler to the detonator is shown in FIGS. 1-6. One preferred arrangement is provided by the connecting block of the present invention (shown in FIGS. 1, 2, and 3). The connecting block is a substantially L-shaped member having vertical first and second arms of substantially tubular configuration. One arm of the L-shaped member is part of the block containing the coupling charge, and the other arm is the device for mounting the block. The block mounting arm, or stem, has an open passage adapted to pass a low-energy detonator cord and a cord formed in or associated with the explosive detonator on the exterior surface of the passage. Preferably, it has a gripping device, e.g. teeth, adapted to grip the wall of the through hole. A means for engaging the detonator of the arm containing the charge positions the detonator parallel to the block mounting arm. the engaged detonator is placed in position within the detonator storage recess when the block mounting arm is inserted into the cord passage hole;
The LEDC can then be passed through the cord passage hole through the open passage in the block arm. This linking block serves several functions. In addition to containing and protecting the coupling charge, the coupling block also prevents coupling when the detonator is placed in the recess of the detonator and the cord is threaded through the cord receiving hole of the detonator or the conduit associated with the hole. It is adapted to hold the charge in the desired position relative to both the LEDC and the detonator.

This connecting block is constructed from thermoplastic or thermoset plastic material. For example, if the detonator assembly is inadvertently removed a large distance within the borehole, e.g.
To prevent accidental deflagration of the coupling charge on impact when dropped from a height of 30 m or more, the plastic thickness of the block around the coupling charge must be at least approx.
It should be 1.5mm.

As mentioned above, for explosive couplers in which the coupling charge is housed in a special coupling element, in some cases the coupling element is inserted into the coupling block of the present invention through an opening in the locking device for the coupler element. It may be preferable to communicate with a passageway in the cord attachment arm.
The coupling element is thus pushed into the hole until it is supported by the locking device and the fully closed end of the cartridge case of the coupling element passes through the opening of the locking device to the cord in the passage. to ensure good capture of detonations from the code. If, for reasons explained below, the linear elongated coupling charge does not extend the entire length of the cartridge case in the explosive housing and through the inner diameter of the case, the coupling charge is completely closed so that the charge captures detonation from the cord. Preferably, it extends through the inner diameter of the cartridge at the end of the cartridge.

In preferred coupling blocks and couplers, the means for engaging the coupling arm with the detonator is such that the detonator is held in one position or is slidable parallel to and along the axis of the coupling arm. It may be a cup-shaped or box-shaped attachment member, a substantially U-shaped channel or the like, adapted to be gripped in such a way that vertical movement is achieved. For example, a box-like attachment member (as shown in FIGS. 7 and 8) that grips a pair of lips along the edge of the channel or a midcircumferential fold at the actuating end of the detonator. A collapsed opening can be used. In some detonator assemblies, the detonator may include a device for attaching the coupler arm of the block, such as an extension sleeve on the working end with a diametrical loop or sling. This diametrical loop can be slid around the coupler arm or around a suitably shaped finger or arm member of the coupler.

The explosive coupler contains an impact-sensitive detonator coupling charge in the form of a linearly elongated array of preferably self-contained coupling elements seated within the bores of the coupling arms of the coupling block. ing. A preferred coupling element is a plastic or metal cartridge containing a sealed explosive charge, such as the metal cartridge shown in FIG. The coupling charge must be sufficiently impact sensitive and present in sufficient quantity to ensure that the charge is detonated, e.g. by the side energy output of an LEDC adjacent to the fully closed end of the metal cartridge of the coupling element. Must be. Moreover, the coupling charge must exert a sufficient radial percussion force during detonation to selectively detonate the percussion-sensitive charges in the detonator. Granular explosives, such as dextrinated lead azide and lead trinitroresorcin, are preferred as coupling charges because of their high sensitivity to impact and good flow properties. Explosive mixture, e.g. 1.5/88.5/
It is also possible to use mixtures of boron/lead/dextrinized lead azide in a ratio of 10% by weight and other mixtures as described in US Pat. No. 3,306,201.

The size of the coupling charge is such that the energy output from the explosive coupler selectively detonates the percussion-sensitive charge in the detonator, i.e., the energy output detonates the explosive charge surrounding the detonator assembly or the detonator itself. That is, it is preferable to make the detonator as small as possible so as to isolate it from the detonator. The required minimum amount of coupling charge depends somewhat on the strength of the coupling charge (which depends somewhat on its degree of compaction and purity), any inert spacers used in the coupling element cartridge (e.g.
It depends on variables such as the nature of the lining tube 15) in FIG. 1, the spacing between the coupling charge and the percussion-sensitive charge in the detonator and the nature of the inert material between them. Smaller coupling charges can be used for cartridges and coupling blocks with thinner wall thicknesses.

As in the preferred case described above, if the coupling charge is housed in a thin-walled metal cartridge case seated in the coupling arm of a plastic coupling block, the desired small size linear coupling charge is Unpressed explosive powder of small diameter, e.g. smaller than 2.5 mm, is used to produce. Therefore, if the explosive charge were to be arranged to extend across the entire diameter of the case, a case with an inner diameter of less than 2.5 mm would be required. Insofar as it is difficult to manufacture cartridges with such small internal diameters and to fill them with explosives, especially with automated equipment, separators of inert material inside standard-sized cartridges are used to form cartridges of small diameter. It is preferable to provide However, in order to expose as large a surface of the cartridge as possible to the side energy output of the LEDC, it is preferred that at the end of the cartridge that is to be placed adjacent to the LEDC, the coupling charge extends across the diameter of the cartridge. A preferred standoff has a hole diameter equal to the diameter of the selected coupling charge and shorter than the fully closed end of the case to provide space between the spacer tube and the bottom of the case. (preferably made of a thermoplastic material, e.g. nylon)
It is a lined pipe. When explosive powder is loaded into the cartridge case, explosive powder fills this space and the hole in the spacer tube. Cutting or tapering the edge of the spacer tube inwardly toward the hole facilitates the loading of the explosive powder into the free space and small diameter hole. Therefore, it is desirable. A plastic spacer tube having a wall thickness of 0.5 mm and a length of 19 mm and an outer diameter of 6.4 mm, such as the tube shown in Figure 1, is housed in a 25
For mm length metal coupler cartridges, the diameter of the hole in the spacer tube is preferably about 1.8 to 2.8 mm, most preferably about 2.2 mm. This results in a charge of about 0.1-0.2 g of the preferred explosive (lead azide), with a charge of about 0.15 g most preferred. In the case of a 36mm aluminum spacer tube, the diameter of the borehole should be reduced to approximately 3mm, as this metal spacer provides a larger boundary.
It can be loaded with approximately 0.65g of explosives. The explosive charge of a linear charge as shown in Figure 1 is generally about 1.2 to 1 m per meter of charge length.
It should be within the range of 2.3g, but approximately
It is preferable to set it as 5.8-14g. The nature and thickness of the materials between the coupling explosive and the bombardment-sensitive charge in the detonator (e.g., the wall of the coupler case, the inner spacer tube (if used) and the coupler arm of the plastic coupling block); For any given set of conditions for the block arm and detonator, if adverse field conditions are expected, e.g. if the coupling charge is at the lower limit, it may cause failure to ignite. If ingress of sand into the air space between the ends of the device is expected, it may be advantageous to select an explosive charge that is not at or close to the specified minimum amount. On the other hand, if there is a possibility of water ingress into this space, a rifle car fitted with an empty detonator of the ignition assembly of the detonator may be loaded with at or near the maximum amount of explosive. The trigger casing may be punctured and the detonator may not function.

The above description relates to a linear elongated coupling charge in which the explosive is continuous. however,
As used herein, the term "linearly elongated coupler charges" also refers to linear elongated rows, such as a loose fit between a spacer and the interior wall of a cartridge, a small axial coupling charge extending through the spacer. Also represents a charge formed from layers of explosive material separated by an inert spacer with small communication channels between the layers of explosive material provided by holes or grooves along the outer surface of the spacer. . These channels are made narrow enough so that the explosive cannot be screened out of one of the layers of explosive. In this embodiment, the layers of explosives extend across the diameter of the cartridge, and one layer of explosives (adjacent
to capture detonation from the LEDC)
A layer of explosive material adjacent the fully closed end of the cartridge case and along the longitudinal axis of the detonator is adjacent the end actuated by the detonator. In this embodiment, the explosive loading in each layer of explosive in a metal shell with an internal diameter of 0.6 cm should be between 0.02 and 0.13 g, preferably 0.06 g.

After the coupler cartridge, which optionally houses a spacer lining tube, is loaded with the explosive or the layer of explosive/spacer/explosive, as described above, the cartridge is, for example, made of a solid material having a diameter slightly larger than the inside of the cartridge. The plastic sphere is sealed so that a tight fit is obtained due to slight deformation of the sphere as it is pushed into the open end of the thin-walled metal shell. For example, a 6.9 mm diameter polyethylene sphere has been found to seal a 6.5 mm inner diameter aluminum cartridge against hydrostatic heads at depths in excess of 150 m.

The total length of the linearly elongated coupling charge, and therefore the total length of the cartridge used to accommodate the coupling charge, is the length of the hole in the device through which the LEDC is passed (e.g. the cord housing of detonator 1 in FIG. 1). It is of sufficient value to extend over the distance between the hole 3) and the detonator receiving recess. A detonator charge sensitive to a percussion in a rifle cartridge casing fitted with an empty detonator whose coupling charge is long enough to extend across the entire diameter of the detonator recess and thus ignites in the center or rim. It is preferred that the entire surface adjacent to, for example, the coupling charge. However, if the energy of the coupling charge is high, it would also be acceptable for the coupling charge to extend over a portion of the diameter of the detonator receiving recess.

To ensure that reliable detonation of the coupling charge occurs, the coupling
The distance between the LEDC and the explosive core should be as small as possible. The aforementioned U.S. Patent No. 4232606
The distance between the LEDC described in the specification and the bottom of the cartridge in the coupling element should not exceed 3.2 mm. Preferably, there is a spacing of about 0.25 mm to 0.75 mm between the cord and the bottom of the cartridge case. This spacing is sufficient to allow free movement of the cord, but small enough to prevent the accumulation of foreign matter and ensure reliability of detonation. The preferred coupler cartridge is a cast aluminum cartridge with a bottom thickness of about 0.13 mm. If the cord described in U.S. Pat. May use bronze cartridges. Insofar as a locking device is necessary in the hole of the coupler arm of the coupling block for proper positioning of the coupler element in said hole, at least a portion of the cast bottom of the cartridge case is connected to the adjacent cord. Preferably, the locking device is designed so that it can be directly exposed to the energy radiated from the cord when it deflagrates.
An exposure diametrically across the bottom of the case having a width of about 2.0 mm or more and a length of 7.3 mm can be used.

The distance between the coupling charge and the outer end face of the percussion cap in the detonator is also kept to a minimum to ensure reliability. The connecting block is made of moldable thermoplastic, such as high or low density polyethylene, polypropylene,
It is preferably manufactured from nylon or polystyrene, and the thickness of the coupler arm of the block in the area between the coupling element and the detonator is preferably less than about 3.2 mm.
Most preferred is polyethylene with a wall thickness of 0.4 mm to 2.5 mm in the said area. If the coupling charge is placed in a special coupler cartridge seated in the coupling block, the wall of the plastic block between the cartridge and the detonator can be cut off. For plastic spacer tubes commonly used with metal coupler cartridges to keep the coupling charge load at a desired low value, coupler cartridges are approximately
It should have a side wall thickness not exceeding 1.0 mm. Plastic spacer tube wall (free selection),
In addition to the metal coupler cartridge (optional) and the coupling block arm located between the coupling charge and the detonator, a small gap can be provided between the coupling block and the detonator. This is useful when the connection of the detonator to the connection block is done in the field. For the assembly shown in FIG. 1, for example, the difference between the thickness of lips 24 and 25 and the width of corrugation 36 allows the detonator to move axially over a limited range. . The axial displacement of the detonator should be adjusted to provide an air space of no more than about 1.6 mm. During use, the air space should be kept to a minimum, as the free air space will fill with water, sand, surrounding explosives, etc., and this will unduly limit or intensify the energy output of the coupling element. be.

The following example illustrates the delayed detonator assembly shown in FIG. 1 and its function.

(a) Detonator 1 is Example 1 of U.S. Pat. No. 4,343,633.
It was a molded detonator described in 1993 with the following changes. (Indicated by reference numeral 5 in Figure 1)
The recess was located adjacent to the cord tunnel and cap recess as shown in FIG. The recess 5 was shaped as described below to receive and retain a portion of the connecting block of the invention. Also, the booster 4 of the cast detonator (tube 6 in Figure 1) described in U.S. Pat. No. 4,343,663 is 10.8 cm long in the detonator assembly of the present invention, and likewise the It was extended to the recess 5 as shown in the figure.

(b) The connecting block was made of high density polyethylene. The lengths of arms 8 and 10, including their overlapping portions, were 5.3 cm and 2.9 cm, respectively. The length of hole 11 in arm 10 was 2.5 cm, and its diameter was 0.70 cm.
The length of extension members 20 and 21 was 2.2 cm, and their width was 0.52 cm, with the portions forming walls 40 and 41 being 2.4 mm wider.
The width of the surface 22 between extension members 20 and 21 was 7.7 mm. The inner diameter of arm 8, ie, the diameter of passage 9 in the portion of arm 10 adjacent to hole 11, was 3.6 mm.

(c) The coupling element 12 has an inner diameter of 6.5 mm, 7.3
It consists of a 25 cm long aluminum cartridge case with an external diameter of 0.1 mm and a fully closed cast end with a reduced thickness of 0.13 mm at the cast end. and its diameter is 4.6
It was warm in mm. Plastic lined pipe 15
was 19 mm long and had an outer diameter of 6.5 mm and an inner diameter of 2 mm. Both ends of the lining tube were tapered inwardly at a 15° angle. The lining tube 15 was pushed into the bottom of the cartridge and slipped into it. An amount of 0.16 g of dextrinized lead azide is loaded into the lined cartridge, and the space between the tapered end of the lining tube and the bottom of the cartridge as well as the lining (visible by X-ray) Fill the hole in the tube. A 6.9 mm diameter solid polyethylene sphere was used to seal the cartridge and force the lead azide.
Excess lead azide formed a layer below the sealing sphere, but this was not necessary to activate the detonator. The coupling element is seated within the bore 11 abutting a locking device 17 therein, thereby exposing the end of the cartridge case 13 to the passageway 9.

(d) Detonator 19 was the detonator described in Example 1 of U.S. Pat. No. 4,429,632. The delayed charge was of sufficient length to provide a 100ms delay. The thickness of the coupler arm 10 between the cartridge case 13 and the end 32a of the detonator's detonator cartridge 32 is 0.6 mm, and the thickness of the coupler arm 10 between the end 32a and the coupler arm 10, which accounts for the axial mobility of the detonator, is 0.6 mm. The maximum air space between
It was 0.3mm.

When the coupling element 12 is placed in position in the bore 11 and the detonator 19 is engaged by the channel 23, the coupling block 7 is placed in the recess 5 of the detonator 1 and the arm 8 is connected to the small booster 6. and the detonator 19 engages with the inner wall of the
is arranged in the recess 4. Walls 40 and 41
and the end face 42 abuts against the wall of the recess of the detonator 1, forming a gap between the lips 24 and 25 and the wall of the recess.
Leave a gap of 1.6mm. A single LEDC as described in Example 1 of US Pat. No. 4,232,606 was threaded through hole 3 and passageway 9 as shown. This LEDC has 6 ends coaxially abutting the exposed end of the cord.
It was deflagrated with a detonator.

Fifteen of the above detonator assemblies were manufactured. All 15 detonators deflagrate after a suitable delay time, and the coupling charge captures the detonation from the LEDC and transmits it exclusively to the percussion cap in the delayed detonator, thereby detonating the detonator. Ta.

Similar results were obtained when the interlocking block assembly was inserted into a cast Pentolite 0.45 Kg detonator. The detonator in this case did not have a recess to place the connecting block completely within the confines of the detonator. In these detonator assemblies, walls 40 and 41 and end face 42 abutted the end of the cylindrical detonator, placing the coupler arm and the actuating end of the detonator outside the confines of the detonator. In such a detonator, an extended cover member may be applied to the detonator to form a protective enclosure for the protruding portion of the connecting block.

The cast detonator of the above assembly is disclosed in U.S. Pat.
No. 4,343,663, the disclosure of which is incorporated herein by reference. Briefly, a detonator charge was injected into a cardboard tube seated on a pre-shaped base plate. Two metal pins were attached to this base plate (to form hole 3 and recesses 4 and 5). A tubular booster 6 was placed on the axial pin. In another embodiment, the tubular booster 6 is coupled to or otherwise attached to a detonator-sensitive explosive, such as an axial pin or an offset pin.
It can be replaced with a charge formed into a small package of PETN and a detonator explosive cast around it.

[Brief explanation of drawings]

1 is a cross-sectional view of the preferred detonator assembly of the present invention threaded through a single low energy detonating cord; FIG.
The figure is a side view showing the empty state of the connecting block shown in Figure 1, Figure 3 is an end view of the connecting block shown in Figure 2, and Figure 4 is the connecting block, and the connecting block is attached to the detonator. 1 is a partially exploded view in cross-section of a portion of the delayed-acting detonator assembly of the present invention, in which the device and the device for locating the connecting block relative to the detonator are different from those of the assembly shown in FIG. 1; FIG. FIG. 5 is a partial cross-sectional view of a portion of the detonator assembly of the present invention in which the aperture through which the detonator cord passes is a tubular member mounted on the outside of the detonator body forming an integral unit with the connecting block of the explosive coupler; 6 is a partial cross-sectional view of the explosive coupler of the invention in which the connecting block of the explosive coupler forms an integral unit with the terminal cap for the explosive coupler; FIG. 7 is a view of the explosive coupler seated in the detonator shown in FIG. FIG. 8 is a cross-sectional view of FIG. 7 taken along line 8--8. 1... Explosive detonator, 1a... Cast explosive, 2
... Jacket, 3 ... Cord passage hole, 4 ... Detonator storage recess, 5 ... Recess, 6 ... Tubular agglomerate, 7 ... Connection block, 8 ... Arm, 9 ...
Passage, 10... Arm, 11... Hole, 12... Explosive coupling element, 13... Cartridge, 14... Coupling charge, 15... Lining tube, 16...
... plug, 17 ... locking device, 19 ... detonator, 20, 21 ... extension member, 23 ... channel, 24, 25 ... lip, 26 ... detonator cartridge, 27 ... base charge, 28...Detonator charge, 2
9... Delayed charge, 32... Detonator cartridge, 33... Detonator charge, 34... Ignition charge, 36... Fold, 39
a, 39b, 39c...Spike, 40, 41...
...Wall portion, 43, 44...Groove, 45...Slot,
46... Detonation cord, 47... Rib, 50... Closing cap, 52... Access opening, 53... Rib, 56... Detonator engagement device, 57... Hole, 5
8a, 58b...slit.

Claims (1)

Claims: 1. A detonator assembly adapted to be passed through a low-energy detonation cord (LEDC), comprising: (a)(1) a detonator-receiving recess substantially parallel to a longitudinal axis; and (2) a substantially cylindrical device comprising or associated with a device having a hole through which the detonator cord passes at a location spaced from the recess and on an axis substantially parallel to the recess. (b) a detonator seated within said detonator receiving recess and having a percussion-sensitive igniting charge at its working end; and (c) a shock-sensitive detonator coupling device. an explosive coupler with a plastic connecting block that stores the charges in linear elongated rows within the holes, the explosive coupler having the explosive in the holes (1) perpendicular to the detonator and in the detonator; (2) positioned adjacent to the pyrotechnic charge to detonate the pyrotechnic charge responsive to the firing of the device;
A cord is attached to the detonator in such a manner that it is positioned perpendicular to a hole in the device through which the LEDC passes and sufficiently close to the opening to be detonated by detonation of the LEDC passed through the hole. The distance between the explosives in the detonator assembly and the inert material between the explosives and the energy output and sensitivity of the explosives are such that the detonating impulse from the LEDC is transferred through the explosives to the detonator. A detonator assembly characterized in that the value is such that the detonator is detonated by the detonator. 2. A detonator assembly as claimed in claim 1, characterized in that the detonator has a cord receiving hole located substantially on the longitudinal axis of the detonator. 3. The detonator assembly according to claim 2, wherein the detonator has a block-shaped recess for accommodating the connecting block adjacent to the cord accommodating hole and the detonator accommodating recess; A detonator assembly characterized in that a connecting block is seated inside said block-shaped recess. 4. A detonator assembly as claimed in claim 3, wherein said block-like recess is formed in said detonator charge and an outer plastic jacket, said outer plastic jacket containing said detonator charge partially or completely surrounding the plastic jacket in the block-like recess having holes allowing access to the cord storage hole and the detonator storage recess, and the connecting block fitting into the recess of the plastic jacket. A detonator assembly characterized by being combined. 5. The detonator assembly of claim 1, wherein the coupling block holds the coupling charge in close proximity to the pyrotechnic charge responsive to the firing of the detonator to detonate the pyrotechnic charge. A detonator assembly comprising a detonator engaging device adapted to engage said detonator. 6 An explosive coupler for connecting a low-energy detonating cord (LEDC) into operative relationship with a percussion-actuated detonator, comprising: (a) coupling a shock-sensitive detonator coupling charge into a linear hole; a plastic connecting block housing the linear elongated coupling charge, said holes being either (1) completely straddled by a thin closure membrane adapted to hold said linear elongated coupling charge; ) the housing for said coupling charge is at least partially closed by a locking position adapted to position the cartridge case in a desired position; a detonator having a pyrotechnic charge at the working end thereof arranged and held in close proximity to the pyrotechnic charge responsive to the detonation of the detonator in such a manner as to detonate the pyrotechnic charge; An explosive coupler comprising a detonator engagement device on said block adapted to engage. 7. An explosive coupler according to claim 6, in which the block is perpendicular to the longitudinal axis of the explosive receptacle and parallel to the detonator adapted to engage the block. having a cord receiving hole disposed on a longitudinal axis, said hole in said block being coaxial with (a) a cord passage hole in a substantially cylindrical explosive detonator to which said coupler is attached; and (b) a closure member of said hole, i.e., adjacent to a locking device, such that an LEDC threaded through said cord passage hole extends sufficiently close to said coupling charge to detonate said coupling charge. An explosive coupler characterized by being directed. 8. An explosive coupler according to claim 7, wherein the coupling charge is self-contained, comprising a metal cartridge completely closed at one end and plugged at the opposite end. Explosive coupler, characterized in that the fully closed end of the cartridge is supported by a locking device in a hole in the connecting block adjacent to the cord receiving hole. . 9. In the explosive coupler according to claim 7, the connecting block is fitted with a rib formed on the surface of the block-shaped recess of the detonator, which accommodates the connecting block. An explosive coupler characterized in that it has a circumferential groove. 10. The explosive coupler according to claim 7, wherein the detonator engaging device is a flexible mounting member that accommodates and holds the detonator in a predetermined position relative to the cord passage hole. An explosive coupler featuring 11. The explosive coupler according to claim 7, wherein the impact-sensitive initiator is lead azide powder. 12. An assembly for generating a delayed detonation of an explosive detonator by means of a low-energy detonation cord, which comprises (a)
a plastic connecting block for storing a coupling charge of an impact sensitive detonator in a linear elongated row within the bore, said bore being adapted to (1) retain said linear elongated coupling charge; (2) at least partially closed by a locking device adapted to position the housing cartridge for said coupling charge in a desired position; and further, (b) the coupling charge is disposed perpendicular to the detonator and held proximate to the igniter charge so as to detonate the igniter charge responsive to the firing of the detonator. a detonator actuated by percussion of a low energy detonator cord (LEDC) comprising a detonator engagement device on said block adapted to engage a detonator having an ignition charge responsive to said percussion at its working end; an explosive coupler for connecting into operative relationship the device, and a delayed detonator having an ignition charge engaged with said block and responsive to percussion at its working end;
Delayed firing of an explosive detonator, characterized in that the coupling device is perpendicular to the detonator and held close to the igniter charge so as to detonate the igniter charge responsive to the firing of the detonator. An assembly for generating a detonation.