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Патент USA US3064579

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Nov. 20, 1962
D. R. BLAIR. JR, ETAL
3,064,573
BLASTING ASSEMBLY
2 Sheets-Sheet 1
Filed July 15', 1956 ‘
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III ll
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DAVID ‘R. BLAIR JR._
HOMER W. COLEMAN
‘JOHN RJ'RYAN
'lNVEN-TORS
BY
‘M @169’AGENT
Nov. 20, 1962
D. R. BLAIR, JR., ETAL
'
3,064,573
BLASTING ASSEMBLY
Filed July 13, 1956
2 Sheets-Sheet 2
DAVID R. BLAIR JR
HOMER W‘ COLEMAN
JOHN R. RYAN
INVENTOR.
BY
84065
AGENT
ll
3,%4,573
Patented Nov. 20,, 1962,
2
very likely to become lodged in the irregular borehole wall
3,064,573
BLASTING ASSEMBLY
David R. Blair, J12, Homer W. Coleman, and John R.
Ryan, Wilmington, Del, assignors to Hercules Powder
Company, Wilmington, Del., a corporation of Dela
ware
Filed July 13, 1956, Ser. No. 597,678
surfaces to “hang up" the assembly, so as to preclude con
tact with the remainder of the blast hole charge and im
pair blasting operations. In some instances the primer
can. containing the detonator on its outer wall as a unit of
an explosive column has been made of a diameter smaller
than that of the other can units in an effort to reduce the
likelihood of a “hang up” of the can in the borehole.
12 Claims. (Cl. 102-44)
This invention relates to new blasting assemblies. In
Even in such instances the problem of hang up of the
assembly in the borehole has not been eliminated inas
one aspect this invention relates to new booster units.
much as the detonator support assembly still protrudes
In one aspect this invention relates to watertight primer
units for use in an explosive column, particularly as
applied to explosives of the nitrocarbonitrate type. In an
other aspect this invention relates to watertight metal
primer cans containing means for supporting an initiator
outside the can in indirect detonating contact with a solid
unitary booster body fastened inside the can to the initiator
from the outer wall of the can.
This invention is concerned with a primer can assem
bly adaptable as a unit of an explosive column in a bore
hole which utilizes a much smaller volume of booster
charge than heretofore with use of a concomitantly larger
amount of main charge, and with such an assembly which
supports the detonator device in a manner that it does
support, the said initiator being protected from damage
not protrude from the borehole walls and is protected
often incurred during operation in a borehole. In another 20 therefrom, whereby hang up in the hole due to the posi'-~
aspect this invention relates to a new blasting method. In
tion of the detonator support means is substantially elimi
still another aspect this invention relates to an improved
nated and the primer can assembly of an explosive column
method for loading a primer can.
-
The use of an initiator or detonator in conjunction
need not be limited to one of diameter smaller than that
of other can units joined therewith. The invention is
with a booster charge to detonate a relatively insensitive
further concerned with a method for packing primer cans
main explosive charge, i.e., insensitive to commercial
wherein .the packing is accomplished in a single operation
\ lasting caps, has been practiced in the art for some time.
uninterrupted by steps ordinarily required for packing,
Dynamites and nitrocarbonitrate compositions have been
the booster charge.
those relatively insensitive charges generally employed, a
An object of this invention is to provide a new primer
nitrocarbonitrate comprising mainly ammonium nitrate 30 can assembly. Another object is to provide for use of
and come carbonaceous material with or without addi
a markedly reduced volume of a booster charge in a
tional sensitizer.
primer can assembly with a concomitant increase in the
In view of the hygroscopic nature of amomnium nitrate,
amount of main charge available. Another object is to
it is important that it be kept dry at all times for use as an
provide a primer can assembly for use as a unit in a
explosive. The art has therefore used watertight metal 35 cap~insensitive explosive column. Another object is to
containers for such compositions. Various means have
provide improved booster units. Another object is to
been employed for detonating such cap-insensitive charges.
provide an explosive column containing such a primer
Often a column of such containers is employed in which
can as a unit. Another object is to provide a primer can
is disposed one or more primer cans at predetermined
assembly adapted to support a smaller volume of booster
points to eifect the necessary detonation. The primer canv 40 charge than used heretofore in a primer can in fastened
contains a main cap-insensitive charge with a booster
indirect contact and detonating relationship with an initia
charge in propagating relationship therewith and an ini
.tor, an to support the said initiator protected from damagev
tiator or detonator in detonating relationship with the
often incurred when operated in a borehole. Another ob
booster.
ject is to provide a method for manufacture of primer can
In accordance with one practice an elongated metal
assemblies. Still another object is to provide for a blast
booster can assembly comprises a layer of main charge,
ing method. Other objects and aspects will be apparent in
a layer of booster charge superposed on the initially dis
light of the accompanying disclosure and the appended
posed layer and a top layer of main charge on the layer of
claims.
,
booster or primer charge, and a detonating fuse led along
In accordance with this invention a blasting assembly
50
the length and outside of the can and held against the
is provided which comprises a closed metal container;
can wall in detonating relationship with the layer of
means for supporting a detonator device in indirect con
booster or primer charge in the can. Other primer cans
tact with the interior of the container so as to be in de
of similar design have been employed. For example, a
tonating relationship with a booster charge therein, said
metal plate with protruding portions forming channels
booster charge being a solid unitary body and fastened
with the can has been utilized to hold a detonating fuse
against the outside of the can. In all instances, the
booster charge has been disposed as a layer and has been
in contact with the said detonator support means so as
to be adapted to said detonating relation, and a main ex
plosive charge in said container positioned in propagating
unduly voluminous in order to ?ll the requisite space for
relationship with said booster charge. Also in accord
its support in the can. There has always been the poten
ance with this invention is provided a booster device com
tial danger of the layer settling out of detonating rela 60 prising an explosive composition detonatable by a com
tionship with the detonating fuse with concomitant fail
mercial blasting cap disposed as a unitary solid body, and
ure. Further, the packing of the booster or priming
means associated with said body adapted to fasten said
charge in the primer can has always involved an interrup~
‘body in indirect contact and detonating relationship with
tion of the packing procedure requiring thereby a separate 65 an initiator. Further in accordance with this invention is
step in the packing operation.
Primer can assemblies of the prior art in which the
detonator element is held against the can side wall have
been disadvantageous from the standpoint of utilization
provided a blasting method employing a blasting assembly
such as above described. Still in accordance with this
invention is provided an improvement in the manufacture
of primer can assemblies wherein packing of the main.
in a borehole inasmuch as the borehole diameter is only 70 charge is uninterrupted, which comprises fastening a uni
slightly greater than that of the can with the result that
any assembly structure on the outside of the can wall is
V
tary mass of a booster charge to an inner side wall of the
said can, the said booster having an over-all dimension
8,064,573
less than that of the diameter of the primer can, and
then initiating packing of the main charge and continuing
said packing until said can is completely charged.
Our invention is illustrated with reference to the draw
ings of which FIG. 1 shows a now preferred form of our
primer can assembly, alone and as a primer unit of an
explosive column; FIG. 2 shows a plan view of a solid
unitary booster charge that can be used in the said as
.
-
V
_
a
to render the container watertight. If desired, one or
more of the ends of conduit 12 can be extended beyond
the side wall of container 10 although that is generally
not preferred in view of di?iculty that would generally be
encountered in the borehole with such projecting portions.
Initiator 13 is ordinarily a detonating cord, for example,
Primacord, and extends from the outside of container 10
into and through conduit 12 and then to the outside of
container 10. Any suitable means for supporting cord
sembly of FIG. 1; FIGS. 3-7 illustrate another embodi
ment of primer can assembly and various aspects thereof; 10 13 in conduit 12 can be employed as, for example, a knot
FIG. 8 illustrates a wedged ?t of booster to detonator
support that can be utilized in the assembly of FIGS.
3-7; FIG. 9, in perspective, further illustrates a rolled end
formed in the cord at a point below the end of conduit 12
below point 18 so that cord 13 will not be pulled out of
conduit 12; or one end of conduit 12 can be ?ared and the
portion 31 of FIGS. 5 and 6; FIG. 10 is a plan view fur
tail end of the detonating cord forced into it, causing suf?
ther illustrative of the wedge ?t of booster and detonator 15 cient obstruction and making it impossible for detonating
cord to be pulled through the conduit.
support of FIG. 8 and illustrates an eccentric ?xed posi
When a blasting cap is employed in place of a detonat
tion of booster to the primer can wall when supported
ing fuse 13, unit 22 is positioned on conduit 12 substan
in detonating relation with a detonator device; FIG. 11
tially opposite the said cap to assure detonation. Booster
illustrates use of an electric blasting cap in lieu of a
detonating fuse in an assembly of this invention; and 20 22 is always disposed in container 10 in propagating rela
tionship with main charge 12 and generally being substan
FIGS. 12 and 13 illustrate still another embodiment of
our primer can assembly and various aspects thereof.
tially surrounded by the main charge except for the por
tion that may be in direct contact with the inner wall 14.
With reference to FIG. 1, container 10' is preferably
elongated, cylindrical and watertight and contains a main
With reference to FIG. 3, side wall 14’ of a can 10' is
explosive charge 11 such as a dynamite or a cap-insensitive
drawn to form a passageway or indent 12' and a recess
23, the latter to accept a plate 24 (FIG. 6) positioned
ammonium nitrate, i.e., a nitrocarbonitrate. Conduit 12
?ush with the outer surface of the side wall 14’ to form
is disposed in container 10 and of su?icient size to contain
conduit 12a for accepting a detonator such as detonator
a detonator device, generally a detonating fuse 13, and
connects with points outside container 10 through the side
13 of FIG. 1. Recess 23 is shown in more detail with
wall 14. Preferably the ends of conduit 12 are sealed at 30 reference to FIG. 4. Draw or recess 23 and indent 12’
can be made in a single step. Conduit 12a formed by
openings 16 and 17 in a side Wall of container 10 in
indent 12’ and plate 24, the latter disposed in recess 23,
sealed relation therewith so as to maintain container 10
watertight as at points 18 and 19. Sealing of tube 12 in
is shown with reference to FIGS. 5 and 6. Indent 12’ is
shaped along its side within container 10’ to form a sup
the side Wall can be carried out in any suitable manner.
Thus, openings 16 and 17 can be indentations as shown 35 porting surface for booster 22, in container 10’, to ?rmly
terminating in ends of appropriate size for accepting tube
support booster 22 in fastened relation therewith. Thus,
12 in snug ?t for sealing.
in one form, the innermost side of indent 12’ in container
10’ is progressively increased in width along its length 27
Booster 22 is a solid unitary mass of any suitable
booster composition such as a polymeric material con
' to form wedge 28 of FIG. 5, 6 or 8 on which booster
taining a suitable crystalline explosive dispersed there
charge 22 (FIG. 7), wedge shaped to conform to ?t the
through.
Such an explosive material is disclosed and
indent 12’ inner surface, can be supported. FIG. 8 is
further illustrative of the wedge shape support of booster
claimed in the copending application of Alpheus M. Ball,
22, in container 10’, on indent 12’. Conduit 12a together
Serial No. 538,788, ?led October 5, 1955, and now aban
with the wedge-shaped surface of indent 12', from which
doned. Booster 22 is shaped so that it can be inserted in
it is formed and which supports booster 22 along groove
container 10 in direct ?xed contact with conduit 12 such
as concentrically, as illustrated. Booster 22 can be a
220, is shown in side view in FIG. 6.
Conduit or tunnel 12a formed by plate 24 and indent
bare plastic mass or it can be packaged in a suitable wrap
per, in any event, being disposed as a unitary solid body
12’ is of sufficient size as to accept a detonator, generally
a detonating fuse such as fuse 13 of FIG. 1, although a
adapted to be a?ixed to conduit 12.
FIG. 1 also illustrates the primer assembly of our in 50 blasting cap 13a can be supported therein, if desired, as
shown in FIG. 11.
vention as a primer unit of an explosive column in a bore
hole 9 containing unprimed explosive cartridges 10a, gen
With reference to FIG. 10, booster 22 is fastened to
the wall portion of conduit 12a in container 10' by sup
erally of the nitrocarbonitrate type. As illustrated in
' port by way of wedge-shaped groove 22c (FIG. 7) against
FIG. 1, the detonating fuse 13 is supported within the
conduit 12 with booster 22 also ?xed in its position rela-'
the inner wedged surface of conduit 12a, i.e., the inner
tive to conduit 12, the detonating fuse being thereby in
most side of indent 12' in container 10’. Plate 24 is rolled
back along a portion of its terminal edge, as also shown
secured detonating relationship with the booster so that
with reference to FIGS. 6 and 9, to provide a smooth
hang-up of the fuse on the wall of borehole 9, with con
comitant removal of the fuse from detonating relationship
with the booster, cannot take place.
surface 31 over which the detonating fuse can move into
As illustrated with reference to FIG. 2, booster 22 in
a preferred form as applied in the assembly of FIG. 1 is
an elongated block 22a with a groove 22b extending longi
damaged in any way.
tudinally therethrough and having a depth to permit sub
stantially concentric positioning of unit 22 on tube 12.
Groove 2212 is dimensioned to permit a snug fit of unit
22 on tube 12.
.
and out of conduit 12a without danger of being cut or
'
With reference to FIGS. 12 and 13, metal container
10a, closed and cylindrical, contains indentation 12b the:
same as indent 12’ of FIG. 3. Plate 14b is fastened
to the outside of container 10a, of a dimension less than
the length of indent 12b, and placed over indent 12b‘
to form conduit 12'a of size and shape to contain a
detonating element, such as conduit 12a of FIGS. 5 or 11..
Conduit 12 can be disposed through container 10 in
Plate 141) is generally fastened to container 10a by weld '
any suitable manner, it being important in any event that
unit 22 be at all times in fastened contact with conduit 12. 70 and contains rolls 31' similar to roll 31 of FIGS. 6, 9
Conduit 12 can extend across container 10 transversely
and 11 to facilitate handling of a detonating cord or
Plate 14b is adapted
to closely ?t the contour of the container 10a so as to
extend through at least a portion of the said container in
minimize any possibility for “hang up” of the assembly
direct communication with points outside the said con
tainer and that it form a seal with the container side walls 75 in a borehole.
or angularly as desired, it being important only that it
conductor leads in conduit 12'a.
3,084,573
6
‘Indentation 12b is shaped along its side Wall, in direct
communication with the interior of container 10a, so as
to support a booster unit such as unit 22‘ of FIG. 7, for
example, as illustrated with reference to FIG. 8 showing
booster 22 supported on wedge shape element 12'.
The assembly of FIG. 12 is further illustrated with
reference to FIG. 13 in which T-shaped metal sheet 24’
contains members 140 and 14b and indent 12b. Sheet
24' can be rolled to form container 10a with indent
121) on its outside surface as shown with reference to
FIG. 12.
Preferably, the roll is made so that the edge
C-—C abuts edge A and a weld can be made along the
resulting line of abutment C-—C of FIG. 12 including
that portion under member 14b, to render the container
10a watertight. Member 14b, covering a portion of
supported in detonating relationship with the booster.
An important feature of the invention is the single
step packing operation that can be employed in loading
the blasting assembly. In loading the prior art devices,
the packing step must be interrupted to permit loading
the booster layer, and then be resumed to complete the
charge. Thus, it is in accordance with this invention
only necessary that the unitary booster body he fas
tened to the support means in the uncharged can prior
to packing the main charge, after which packing is
initiated and continued until the container is completely
charged. This improvement is of major importance, par
ticularly with reference to assembly line packing where
considerable time has been consumed in the past in
terminating the packing operation, moving the container
indentation 12b, is then welded to the outer surface of
to a position for packing a layer of booster charge in
container 19a along the line b—b. In lieu of an abut
position vfor detonation by the initiator, packing the
ting relationship to form line C-—C of FIG. 12, any
booster charge, and then moving the container from
desired amount of overlap can be employed, with a
the booster charging step to a position for completing
weld along the line of contact of either edge C—C or 20 charge of the main explosive. Thus, in accordance with
A—A, or both, with metal container Etta and with addi
our invention, we can pack the container with one com
tional weld when necessary to render container 14in
position rather than using various increments in the cans
watertight.
such as is necessary in packing the primer cans of the
Indent 12b of FIG. 13 is “dished” in the appropriate
prior art.
direction to face from container 16a, depending on the 25
The metal container is of any suitable size, say from
3 inches to 11 inches in diameter and of a length in the
direction of roll of sheet 24'.
Any suitable booster composition can be employed so
order of from about 10 to 24 inches. Metal containers
long as it can be fastened as a unitary body to the
of size outside these ranges can, of course, be em;
detonator support means. Exemplary of suitable boosters
ployed.
are tetryl, pentaerythrite tetranitrate, picric acid and the 30
Although any cap-insensitive main explosive charge is
preferably employed in the practice of this invention,
like.
These materials are generally packaged in a suit
able wrapper for fastening to the detonator support ele
ment.
Preferred booster compositions are those produced by
the formation of the polymerization product of a uni
.
the invention is not limited thereby, as any type of main
explosive charge can be employed as desired.
Nitrocarbonitrate explosive compositions which con
stitute our new preferred main charge are su?iciently
insensitive so that they will consistently fail, when un
form mixture of polymerizable vinyl material through
which is dispersed a nonaromatic explosive material se
con?ned, to prop-agate when initiated by the strongest
lected from the group consisting of azides, organic ni
commercial detonator in general use, namely, a No. 8
trates and organic nitramines. Such vinyl-type polym
cap. The composition, furthermore, will fail to detonate
erizable materials are exempli?ed by the acrylics such 40 With several No. 8 blasting caps ?red simultaneously or
as methyl, ethyl and butyl acryl-ate or methacrylate;
with from 0.540 grams TNT primed with a single blast
styrene, styrene-polyesters, acrylonitrile, diallyl phthalate
ing cap. Thus, the sensitivity of the composition is far
and the like. The acrylics and the styrene-polyesters are
below that necessary to detonate consistently with a sin
preferred. Exemplary nonaro-matic explosive components
we ethylene dinitramine, methylene dinitramine, cyclo
trimethylenetrinitramine, diethanolnitramine dini'trate,
pentaerythritol tetranitrate, lead azide, silver azide, nitro
gle commercial blast-ing cap of maximum strength.
The No. 8 blasting cap is de?ned as one containing the
standard charge of 2 grams of mercury fulrninate or
fulminate composition and the No. 6 cap is de?ned as one
containing 1 gram of mercury fulminate or fulminate
lactose, succrose octanitrate, lactose octanitrate and _.
manni-tol hexanitrate. Nitrocellulose in ?brous or ?la
ment form or in solution may also be employed. When it
it is desired to incorporate a liquid explosive in the
composition, both as set forth in Bulletin No. 39 of the
US. Bureau of Mines.
composition, nitroglycerin or other liquid nitric ester
may be employed. These compositions are set forth in
application Serial No. 538,788, above referred to. Our
preferred booster charge is a polymerization product of
the type described above containing pentaerythritol tetra
nitrate as the dispersed explosive component, polybutyl
monium nitrate has a certain ?neness and the ?nished
methacrylate-PETN being now preferred.
The size of the booster body is small as compared with
the interior of the metal container as is clear from the
foregoing, being in any event su?iciently small that when
fastened in detonating relation with the initiator, it can
not seriously obstruct ?ow of main charge into the
The nitrocarbonitrate is not, however, less sensitive than
a uniform composition comprising 94.5 percent ammoni
um nitrate and 5.5 percent paraffin, providing the am
explosive has a density not exceeding 1.15.
Sensitivity of nitrocarbonitrate explosives can be regu
lated by utilizing a more ef?cient sensitizer such as a
nitroaromatic compound or mixture thereof, preferably
one or more of the nitrotoluenes.
Preferably, a fuel is
utilized with the nitrocompound which iscapable of utiliz
ing the excess oxygen of the ammonium nitrate with gen
eration of heat. Hydrocarbons of the ole?n, para?in or
aromatic series, para?in, and carbon as coal, are advan
container during the packing operation. Booster bodies
tageously employed, although many other suitable car
of this invention, by way of example, are often say 65 bonaceous materials have been utilized, such as amyl alco
from M2 by 2 inches up to about 21/2 by 4 inches.
hol, ethylene glycol, starch, cellulose and the like.
Although We have illustrated a conduit or tunnel as
Exemplary of other sensitizers that can be employed are
our preferred detonator support means, any suitable sup
Mg, Al, Se, S, inorganic sul?des and carbides.
port means can be employed, it being preferred that the
A satisfactory nitrocarbonitrate composition is one con
taining, for example, 92-95 percent ammonium nitrate and
5-8 parts of coal. When employing a nitroaromatic hy
entire support means does not extend from the outer wall
of the metal can to thereby obstruct handling of the
can in ‘a borehole. Thus, a draw can be made in the
wall of the metal can and the ‘detonating fuse can be
drocarbon as a sensitizer, from about 0.5 to 10 percent of
each nitrocompound is employed, the composition prefer
supported therein in indirect contact with the booster by
ably containing about 85 pcrcent or more ammonium
brackets. An electric blasting cap can be similarly 75 nitrate. If less than 85 percent ammonium nitrate is em
3,064,573
7
8
.
with'its longitudinal axis and adapted to accept a detonat
ing fuse; a conduit in said container adapted to accept a
ployed," other explosive compounds‘ may be used to make
up the de?ciency, such as perchlorates as KClO3, or an—
detonating fuse and of length about the same as the dis
other nitrate as NaNO3. However, in any event, the
tance between said openings, said conduit at each end con
amount of sensitizer or supplementary explosive employed
is limited to that which will not place the explosive out Cl necting with said side wall to close one of said openings
in sealed relation therewith to render said container water
side the prescribed sensitiveness limits, i.e., to render the
tight; a main explosive charge, insensitive to detonating
composition detonatable by a commercial blasting cap.
Exemplary
nitrocarbonitrate
compositions
are
action of a commercial blasting cap within said container;
a solid plastic body, as a booster charge, within said cou
as
follows:
10 tainer and imbedded, in at least major proportion, in said
Composition ______________ __
1
2
3l
4
5
Weight percent
Ammonium nitrate _______ __
Sodium nitrate__ __ _
main charge and containing a crystalline explosive dis
persed therethrough; means for securing said solid plastic
booster body, in said container, directly to, and about at
least a portion of, the said conduit, and said plastic body
15 being supported by said means in said contact with said
conduit.
2. ‘In the assembly of claim 1, a groove disposed along
a side of said plastic body and shaped to accept said con
duit for support of said body on said conduit.
3. An assembly of claim 1 wherein said plastic booster
Dinitrotoluene _ _ -
N1trobenzene____.
Para?in ______ _ .
Fuel oil.
Coal
body contains pentaerythritol tetranitrate dispersed therein.
4. A blasting assembly comprising a closed elongated
water-tight metal container; a main explosive charge, in
1 A now preferred composition.
Our invention relates also to metal containers per se
sensitive to detonating action of a commercial blasting
for explosives, as described herein, which are accordingly
an object of our invention. Thus, in accordance with such 25 cap, in said container; a conduit longitudinally extending
adjacent at least a portion of a side wall of said container
an embodiment, we provide a closed metal can; means for
and within the contour of the said side wall, and at least
supporting a detonating device in indirect contact with the
a portion of the wall of said conduit being in direct com
interior of said can so as to be in detonating relation with
munication with the interior of said container; said conduit
a booster therein; and means in said can for supporting a
being connected at its ends, with the said side wall of said
solid unitary body of a booster charge in fastened position
container, in direct communication with the exterior of
in said detonating relation.
said container in sealed relationship therewith to maintain
Although we prefer to fasten the booster charge in the
said container water-tight; a solid body, as a booster
container directly to the detonator support means as de
charge, within said container and imbedded, in at least
scribed, it is to be understood that it is within the scope
of our invention to fasten the said booster within the con
35
tainer in any suitable manner, it being only required that
the booster charge be a unitary solid body fastened in the
container in indirect contact and detonating relation with
the detonator. Thus, a detonating fuse can be supported
adjacent the outside wall of the container‘ and the solid 40
booster unit can be attached directly to the inside wall of
the container in close proximity to the detonator in deto
nating relation therewith. By way of further illustration,
a conduit 12 of FIG. 1 need not always be the supporting
means for the booster charge. The booster charge can
be supported in the container of FIG. 1 in any suitable
manner in detonating relation with detonator 13, such as
by any suitable means for connecting the booster unit with
an inner wall of the container; for example, a bracket or
clamp device on the inner wall of the container for en
gaging the booster and holding same in detonating rela
tion, or means associated with the booster for so support
ing it, as described herein.
Any suitable means associated with the solid booster
unit for fastening it in the container in indirect contact
and detonating relation with the detonator can be em
ployed. Thus, any suitable fastening device as a ring or
clamp around the booster unit, adapted to engage the
detonator support or the inner wall of the container to
hold the booster in the said detonating relation, can be
employed.
major proportion, in said main charge and comprising a
crystalline explosive; said conduit being adapted to contain
a detonator for initiating said booster charge; means for
securing said solid booster body in said container directly
to, and about at least part of, the said conduit wall portion
in direct communication with the interior of said container
as described; and said solid booster body being secured
by said means in said contact with said conduit.
5. An assembly of claim 4 wherein said conduit is dis
posed within said container substantially parallel with the
longitudinal axis of said container in close proximity to
an inner wall thereof, and said booster is secured sub
stantially concentrically with said conduit.
6. An assembly of claim 4 wherein said container con
tains an elongated indentation in an external side wall
thereof, the said indentation laterally extending into said
container, and wherein a plate is disposed ?ush with the
said external side wall of said container over a portion of
said indentation, to form said conduit.
7. An assembly ‘of claim 6 wherein the wall of said
conduit in direct communication with the interior of said
container is of progressively increased width; wherein a
groove is disposed along an outside wall of said solid
booster body and is shaped to ?t the contour of said
conduit at at least one predetermined point; and wherein
said solid booster body is fastened around a portion of the
conduit thus formed by contact of the surfaces of said
groove ?tted on the wall of said conduit at at least one
In another embodiment we provide as an explosive
assembly a closed watertight metal can equipped with a
conventional conduit-well for containing a blasting cap,
of said predetermined points;
container to the said conduit.
thereof, the said indentation extending laterally into said
8. An assembly of claim 4 wherein said container con
and having a unitary solid booster body fastened inside the 65 tains an elongated indentation in an external side wall
As will be evident to those skilled in the art, various
container, and wherein a plate is disposed on said external
modi?cations can be made or followed in light of the fore
side Wall over a portion of said indentation to form said
going disclosure and discussion without departing from
conduit.
the spirit or scope of the disclosure or from the scope of 70
9. A device of claim 8 wherein said plate is an extended
portion of the wall of said container and overlaps said
indentation in sealed relation with the outside wall of said
container to maintain said container watertight.
10. An assembly of claim 4 wherein said main charge
the claims.
'
What we claim and desire to protect by Letters Patent is:
'
l. A blasting assembly comprising a cylindrical metal
container, watertight except that its side wall contains a
pair of openings disposed on a line substantially parallel 75 is a nitrocarbonitrate, and wherein the booster charge is
3,064,573
1.0
a plastic body and comprises the polymerization product
of a polymerizable vinyl material containing dispersed
therein a nonaromatic explosive material selected from
the group of azides, organic nitrates and organic amines.
11. In an assembly of claim 4 said means comprising a
groove along a side of said solid booster body parallel to
the longitudinal axis of said conduit and shaped to engage
said conduit to secure said body to said conduit.
12. An explosive assembly consisting of a plurality of
cartridge units disposed in propagating relationship as a
column and each said unit containing an explosive insensi
initiating said booster charge; means for securing said solid
booster body in said container directly to, and around at
least part of, the said conduit wall portion in direct com
munication with the interior of said container as described;
and said solid booster body being secured by said means
in said contact with said conduit.
References Cited in the ?le of this patent
UNITED STATES PATENTS
292,642
Freund _______________ __ I an. 29, 1884
2,171,384
Young ______________ __ Aug. 29, 1929
unit as a member of said column and in propagating rela
2,138,581
2,398,071
Kirst ________________ __ Nov. 29, 1938
Barab ________________ __ Apr. 9, 1946
tionship with at least one of said cartridge units, the said 15
primer unit comprising a closed elongated water-tight
2,425,472
Hodgson et a1 _________ __ Aug. 12, 1947
2,586,541
Horn et al _____________ __ Feb. 19, 1952
tive to detonating action of a commercial blasting cap as
the sole explosive charge, together with at least one primer
metal container; 2. main explosive charge, insensitive to
detonating action of a commercial blasting cap, in said
container; a conduit longitudinally extending adjacent at
least a portion of a side Wall of said container and within 20
the contour of the said side Wall, and at least a portion of
the wall of said conduit being in direct communication
With the interior of said container; said conduit being con
nected at its ends, with the said side wall of said container,
in direct communication with the exterior of said container 25
in sealed relationship therewith to maintain said container
Water-tight; a solid body, as a booster charge, within said
container and imbedded, in at least major proportion, in
said main charge and comprising a crystalline explosive;
said conduit being adapted to contain a detonator for
2,669,928
Sweetman ____________ __ Feb. 23, 1954 .
2,680,406
2,733,658
Austin ________________ __ June 8, 1954
Moat _________________ __ Feb. 7, 1956
2,751,810
2,754,755
2,761,384
Clark et al ____________ __ June 26, 1956
Ruth et al ____________ __._ July 17, 1956
Sweetman _____________ _- Sept. 4, 1956
2,775,200
Guenter ______________ ..._ Dec. 25, 1956
2,782,715
2,784,638
2,913,892
2,944,485
Udry ________________ __ Feb.
Diels et al ____________ __ Mar.
Hayes _______________ __ Nov.
Ely et al ______________ __ July
26,
12,
24,
12,
1957
1957
1959
1960
FOREIGN PATENTS
649,806
493,862
Great Britain __________ __ Jan. 31, 1951
Canada ______________ __ June 23, 1953
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