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Патент USA US2122706

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July 5, 1938.
F. H. ARMSTRONG
2,122,706
INDESTRUCT‘IBLE RELEASE MECHANISM FOR BLASTING CARTRIDGES
Filed April 27, ‘1936
2&5
w,~\\2».Q3“I;w1%IVQ
12,122,706”
Patented- July 5, 1938
PATENT OFFICE. ~
UNITED STATES
2,122,706
INDESTRUCTIBLE RELEASE MECHANISM
FOR BLASTING CARTRIDGES
Frank H. Armstrong, Chicago, 111., assignor to
Cardox Corporation, a corporation of Illinois
Application April 21. 1936, Serial No. 76,690
24 Claims‘. (01. 102-6)
This invention relates to new and useful im
-
-
-.
obtained by intensely heating the initially com
pressed gas charge with either a chemical heater
unit or a permanent electric resistance unit. Car
tridges receiving chargeslof the above two desig 10
adjusted to release ‘charges at different work per
'
a
be released. The ?nal blasting pressure may be
structible character and is susceptible of being
forming pressures.
1
?nal blasting pressure at which the charge is to
from indestructible ‘7 cartridges or shells and
wherein the release mechanism is of an inde-,
10
w
1931. The blasting charge within the cartridge
l0 also may take the form of air, or other gas
compressed at a pressure less than the desired
7
The primary object of this invention is to pro
vide mechanism for releasing blasting charges
5.
1
‘ sued to Dent Ferrell et 9.1., 1,805,541, on May 19,
provements in indestructible release mechanism
for blasting cartridges.
_
_
nated characters are known in thetrade as pre
A furtherimportant object of the invention is
charged cartridges. The trade also is'gfamiliar
withv what is termed ‘post-charged cartridges.
in a discharge cap adapted to'be detachably asso- - Cartridges of this character». are charged after 15
they areplaced in _a blastor drill hole. The
15 ciated with a cartridge or shell.
A still further important object of the inven-. charge ‘usually takes the form or a compressed
gas, such as air, whichis delivered to the, cartridge
tion is to provide indestructible release mecha
to provide indestructible release mechanism for
blasting cartridges which is completely embodied
nism which will operate to effect discharge of a _ from a portable compressor unit or’from a port
blasting medium from a cartridge or shell and able storage tankf'o'r‘ receiver, unit. ’ It will be 20
understood, as the ‘description of the release
20 wherein the blasting medium may take the form
mechanism embodying, this invention proceeds
of carbon dioxide gas generated by intensely heat
ing liquidv carbon dioxide or highly compressed
air.
that the said mechanism will operate. very e?ec
tlvely to release'fthe charge from ‘a post-charged
cartridge whemair, or other gases, is compressed
in the cartridge-‘l0 to the pressure at which the‘
'
Another-object; of the invention is to provide
indestructible release mechanism which operates
2
release mechanism is set to operate.
automatically to effect discharge of a blasting
‘ Figure 1 illustrates the discharge‘ end of the,
medium from a cartridge or shell when the pres
cartridge 1'0‘? This end is provided with an inter‘
sure of said blasting medium reaches a prede
termined value within the shell and wherein the
‘ discharge mechanism is operated entirely by the
30 pressure of the blasting charge within the car-_
tridge or shell.
__
-
nally threaded terminal portion ll. Spaced'ax-'
ially inwardly of this threaded portion is a shoul-' 30
der or restriction l2. This shoulder forms a seat
'
13, in the manner illustrated.
provided with a series of obliquely varranged "dis?"
charge ports iii. A shoulder I1 is formed i'n'the
employed to‘designate like parts throughout the
40
_
‘
an enlarged cylinder or chamber portion I8 with-v 40
‘Figure 1 is a longitudinal sectional view of the
invention,
in the cap bore.
I
' '
"
Threadedly connected tovthe outer ‘end of the‘
Figure 2 is a transverse vsectional view taken on ' .a discharge cap I5 is a closureplug l_9. Apacking.
line 2-2 of'Figure 1, and
Figure 3 is a transverse sectional view taken on
v
" line 3-: or Figure-1.
In the drawing, wherein for the purpose of il
lustration is shown a preferred embodiment of
flthis~ invention, the reference character 10 desig
nates‘an indestructible cartridge or shell which
50 is intended to receive a blasting charge that is to
be released at a desired work performing pressure
into the material to be broken down. The blast
55.
bore offthe; discharge cap 15 by the, formation of
'
indestructible release mechanism embodying this
'
outwardly, of the reduced‘ portion M, the cap is;
- In the accompanying drawing forming a part of'
'
'
the cartridge III is an externally threaded, reduced ,
this speci?cation and in which like numerals are
'
" -
portion Id of a tubular discharge cap. [5. _ Spaced ,35
35_ ing description.
same,
‘
Threadedly connected to the extremity “of.
Other objects and advantages of the invention
will be apparent during the course of the follow
ing charge may take the form of liquid carbon di
§ oxide which is to be intensely heated by a chem
ical heater unit, or the like for converting the
ring or gasket 20 is arranged between the closure
plug I9 and an adjacent surface of the cap [5 to
prevent leakage between these two elements.
Threadedly mounted in a pocket 2 l ,formed in ‘the
plug I9 is a valve member 22 which may be backed
off to permit fluid trapped in the cylinder 18 to 50
be discharged through the port 23, formed in the
plug l9. The utility of this valve 22 will befully
explained at a later point.
'
-
'
The seat iii of the cartridge or shell l0 and the
extremity 24 of the reduced portion [4 of the 55
discharge cap l5 have con?ned between the same
.liquid carbon dioxide into gas at a relatively high a packing ring_25 and a'hardened metallic ring
' 26.. This metallic ring is ‘intended to function as
pressure. For a complete understanding‘ of the ' a seat for the ‘valve head 21 which is threadedly
mechanism of a cartridge charged with carbon
connected to the rod or stem 28 of a piston 29 00
30 * dioxide, reference may be had to the patent is
2
2,122,700
which is located within the cylinder or chamber
i6 of the discharge cap l6.
-
against the ring 26. The pressure of the charge
within the cartridge I6 is delivered through the
passageway 44 to the valve 46 which is carried by
the plunger 46. Due vto the relatively small area
of the passageway 44, the valve 46 is subjected to 6
a comparatively small force. The spring 46
should be of proper strength to retain the valve
46 seated until the desired blasting pressure is
- obtained within the cartridge l6; jfor example, a
v
The piston 29 is formed‘ with a portion 30 which
slidably ?ts the bore of the cylinder or chamber
I8. From the enlarged portion 30 of the piston
to the conical portion 3| which blends into the
rod or stem 28, the piston is provided with a re
duced cylindrical portion 32. The difference in
diameter between the portions 39 and 32 of the
10 piston provides a shoulder arranged inopposition
pressure'of from 10,000 to 15,000 lbs. per square 10 .
inch. .When such a pressure is obtained in the _
to the shoulder l1 formed in the discharge cap
IS. A spring 33 is interposed between these two
cartridge II, the valve 46 will be unseated. A
slight opening movement of the valve 46 will
shoulders to function as preliminary seating
means for the valve head 21.
15
permit pressure to build up within the bore-42 oi
The piston 29 ‘outwardly of its enlarged portion ' the piston 29 between the inner end of this bore 15
30 is formed with a reduced extension 34 which is, and the plunger 7 46. This pressure will set
externally screw-threaded. A cup leather 35 is against the cup leather 49 and the nut 66 to force
held against the surface 36 of the piston portion
30 by means oi’_a ring or nut 31.
20
Threadedly connected to the extremity of the
the plunger 46 axially against the pressure of the
spring 46. It will be appreciated that the cup
leather 49 will function to prevent leakage of the 20
blasting medium past the plunger 46. ‘Should
any of the blasting medium leak past the cup
leather, the same will be vented through the port
reduced piston portion 34 is a spider or guide head
39. Figure 3 discloses this spider or guide head as
including the radially ‘projecting fins 40 which
are arranged in circumferentially spaced relation
to provide the series of openings 4|.
64 to the exterior of the piston.
.
The portions 30,32 and 34 of the piston 29 are
bored to form a cylinder 42. The outer end of
this cylinder is- closed by the spider 39. The inner
end of this bore or cylinder has formed in its
~' wall a frusto-conical pocket 43.
It will be ap-. -
preciated, therefore, that a pressure can not build 26
up in back of plunger 46 which would result in
premature closing of valve 465'
3 Axial movement of the plunger 46 with the
cup leather 49 will move the latter to uncover
Extending from
the inner end of the by-pass 6i. The blasting 30
the inner end wall of this pocket through the rod
or stem'28 and the axis of the valve head 21 is a
passageway 44 which establishes. communication
between the interior or bore of the cartridge l0
and the bore or cylinder 42 of the piston 29.. '_
A valve 46 is arranged to control communica
tion between the passageway 44 ‘and the bore 42
of the piston. Formed integrally withthe valve
46 is a plunger 46 which is slidably ?tted within
40 the bore 42 of the piston. Projecting axially from
the plunger 46 is a stem 41 which is encircled by
a compression spring 46. One end of the spring
medium, then will'ilow from the cartridgell
through the passageway '44 into the bore 46 oi’;'
the piston and from said bore through the by-' ,
Pass 6| into the annular chamber 62. The blast
ing medium will be discharged-from the chamber 36
62 into the cylinder or chamber l6 formed in the
discharge cap l6 through the ports 63. The
pressure of the blasting medium will build up in
the chamber or cylinder ll of the discharge cap
until it susbtantially equals the pressure within 40
the chamber of the cartridge ill or until it reaches
a value which, acting upon the exposed surfaces
46 bears against the surface of the plunger 46 . of the nut 31 and cup leather 36 and the spider
while the other end of the spring bears against ’ 39 will. overcome the pressure within the cartridge \
the inner surface oi’ the spider 39. This spring - III which is fimctioning to retain
valve‘head 21 45 -
functions to retain the valve 46 seated to prevent
?ow of ?uid from the passageway 44 into the
bore 42 of the piston 29.
‘
'
A cup leather 49 is retained against the plunger
50' 46 by .means of a ' retaining nut 60.
The cup
against the ring 26. It will be appreciated that
the cup leather 36, thenut 31 and the slider 36
7' provide atotal area which- is in excess of the area
or diameter of the valve head 21. The pressure
leather 49 functions, during axial movement or
the plunger 46, as a valve for controlling ?ow of
?uid through the bY-D8SS\§| which extends from
the bore 42 .ot the piston to andsthrough the sur- .
55 face 36 of the piston portion 36. It will be noted
that the central opening of the cup leather 36 is
of a proper diameter to provide a chamber 62
built .up within the chamber ll of the discharge ‘0
cap l6, therefore, will function to move the valve
head 21 oil of its seat. Unseating of the valve
head 21 will permit the blasting charge to be re
leasedjrom thetcartridge. l3 intoithe discharge ,
cap l6 and outwardlythroukhthediszchargem 66
l6.
7.
.
-
It will be appreciated that the cup leather 36
which communicates with the by-pass 6| and is of - will effect a seal between the piston 29 and the
annular formation. The nut 31 is provided’ with chamber I6 to permit pressure to be built up in
‘so one or more axial passageways 63 which com the
chamber. This blasting medium delivered to Q
- municate with the annular chamber 62.
the chamber l6 normally willbe exhausted there
A port 64 is provided to vent the portion of the ' from by slowly leaking past the cup leather 66'.
bore 42 of the piston 29 which is arranged be- \ If, however, the cup leather so tightly seals the T '
tween the plunger 46 and the inner faceof the
65
spider 39.
v
r
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'
- The indestructible release mechanism embody
ing this invention functions in the following man
chamber I6 that the charge will not leak past the
said cup leather, the valve 22 may be backed .5
away from its seat to reduce the pressure within _
the chamber to atmospheric pressure. The
ner to‘ automatically release‘ a blasting charge
from the cartridge l0 when the pressure of the
mechanism then'will be in readiness‘ to receive
and eil'ect release of a second charge from the
charge reaches a predetermined value:
cartridge chamber.
‘
It will be noted that the valve head 21 seats in
the direction of discharge of the blasting medium
from the cartridge ill. The pressure of the blast
ing charge within the cartridge, therefore, nor
66 mally functions to retain the valve head 21 seated _
'
It. further will be appreciated that by varying
the strength of the spring 46, the pressure at
which the blasting charge will be released from‘
the cartridge l0 may be varied.
_
7. .
'
Itistobeunderstoodthat the formofthisin- '
3
2,122,700
5. In combination, a blasting cartridge having a
chamber for receiving a blasting charge the pres
sure of which is to be built up to the desired blast
ing pressure, a discharge cap attached to the car
tridge, and means embodied in the discharge cap
vention herewith shown and described‘ is to be
taken as a preferred example of the same, and
that * various _. changes in the shape, size, and
arrangement of parts may be resorted to without
departing from the spirit of the invention or the
scope ‘of the subjoined claims.
_
‘
, for releasing the charge from said chamber when
Having thus described the invention, I claim:
thepressure' of the charge reaches a predeter
" 1. vIn combination, a blasting cartridge having lnined value, said means including a charge re
achamber for receiving a blasting charge the
leasing valve held closed by the pressure of the
pressure of which is to be built up to the desired ' charge, a hollow piston having a rod connected to 10
blasting pressure, release means for the blasting
charge, a control chamber, means in said control
chamber for opening said release means vwhen a
portion of the blasting charge is admitted to the
control chamber and for holding open said release
means as long as the-blasting charge remains in
the control chamber, and means carried by the
control chamber means and subjected to the pres
sure 01.’ the charge in the first-mentioned chamber
the valve for opening and holding open the valve
when the piston is subjected to the pressure of_
the charge, a passageway through the valve and
rod connecting the charge receiving chamber and
the bore of the piston, and means in the piston
bore for establishing and maintaining ?ow of the
blasting charge through said passageway until the
charge is exhaustedto cause the piston to be sub
jected to the charge pressure, said last mentioned
' for establishing communication between the two . means comprising a valve sealing the piston bore 20
chambers when the pressure of the blasting charge end of the said passageway and a di?erential pres
sure piston connected to the valve.
‘ reaches a predetermined value and for maintain
ing said communication until the blasting‘charge
has been entirely released. -~
25
2. In combination, a blasting cartridge having
a chamber for receiving a blasting charge the
pressure of which is to be built up to. the desired
blasting pressure, a discharge cap attached to the
cartridge,'and means embodied in the discharge
cap for releasing the charge from said chamber
when the pressure of the charge reaches a prede
termined value, said means including a charge
releasing valve held closed by the pressure of the
charge’, a piston connected to the valve for open
ing-and holding open the same when subjected to
the pressure of the charge, and means operated
6. In combination, a blasting cartridge-having
a chamber for receiving a blasting charge the
pressure of which is to be built up to the desired
blasting pressure, a discharge cap attached to the
cartridge, and means embodied in the discharge
cap for releasing the charge from said chamber
when the pressure of the charge reaches a prede
termined value, said means including a charge re
valve when the piston is subjected to the pressure ,
of the charge, a passageway through the valve
and rod connecting the charge receiving chamber
' by the pressure of the charge for subjecting the
and the bore of the piston, and means in the piston
piston .to the charge pressure and for maintaining
bore for establishing and maintaining flow of the
blasting charge through said passageway until the
said piston so subjecteduntil the pressure in the
40 blasting charge chamber drops to atmospheric
pressure.
‘
‘
3. In combination, a blasting cartridge having
a chamber for receiving a blasting charge the
pressure of which is to be built up to the desired
30
leasing valve held closed by the pressure of the
charge, alhollow piston having a rod, connected
to the valve for opening and holding open the
charge is exhausted to cause the piston to be sub 40
jected to the charge pressure, said last-mentioned
means including a spring pressed valve.
7. In combination, a blasting cartridge having
a chamber for receiving a blasting charge the pres
45 blasting pressure, a discharge cap attached to the ~ sure of which is to be built up to the desired blast
cartridge, and means embodied in the discharge ing pressure, a discharge cap attached to the car
cap for releasing the charge from said‘ chamber tridge, and means embodied in the discharge cap
when the pressure of the charge reaches a prede
for releasing the charge from said chamber when
termined value, said means including a charge the pressure of the charge reaches a predeter
releasing valve held closed by the pressure of the mined value, said means including a charge releas 50
charge, a piston connected to the valve for open
ing valve held closed by the pressure of the'char‘ge,
ing and holding open the same when subjected to a hollow piston having a rod connected to the
~the pressure of the charge, and means carried by
said piston and operated by the pressure of the
553 charge for subjecting the piston to the charge
pressure and for maintaining said piston so sub
jected until the pressure in the blasting charge
chamber ‘drops to atmospheric pressure.
4. In combination, a blasting cartridge having a
60: chamber for receiving a blasting charge the pres
sure of which is to be built up to the desired blast
ing pressure, a discharge cap attached to the car
' tridge, and means embodied in the discharge cap
for releasing thecharge from said chamber when
65 the pressure‘ of the charge reaches a predeter
mined value, said means including a charge releas
ing valve held closed by the pressureof the charge, '
’ a'hollow piston connected to the valve for open
valve for opening and holding open the valve when
the piston is subjected to the pressure of the
charge, a passageway through the valve and rod
connecting the charge receiving chamber and the
bore of _the piston, and means in the piston bore
for establishing and maintaining flow of the blast
ing charge through said passageway until the
charge is‘ exhausted to cause the piston to be sub
jected to the charge pressure, said last-mentioned
means including a spring seated blasting pressure
opened compound valve assembly.
8. In combination, a blasting cartridge having
a chamber for receiving a ‘blasting charge the
pressure of which is to be built up to the desired
blasting pressure, a discharge cap detachably
connected to said cartridge, a ring forming a valve
ing and holding open the'same when subjected to seat clamped between portions ‘of the cartridge
70 th‘e'pressure of the charge, and means-located in and the discharge/cap, a valve for controlling
the bore of the piston for'causing the piston to be communication between the cartridge and the
subjected 'to’the charge pressure and for main ' discharge cap, and charge pressure operated
taining said piston so subjected until the pressure
" in the blasting charge chamber drops to atmos
pheric pressure.
mechanism in the discharge cap for unseatlng
said valve; -
,
9. In combination, a blasting cartridge having
(H)
4
2,122,708
a chamber for receiving a blasting charge the - ‘atmospheric pressure when said chamber is
pressure of which is to be built up to the desired charged, a ?ow path for conducting a portionot
blasting pressure, a discharge cap threadedly con
the blasting charge from said chamber to one
nected to the ‘cartridge, valve seat forming means side of said piston, a spring loaded valve for
clamped between portions of the cartridge and
discharge cap, a valve engaging said ‘valve seat
means on the cartridge side otithe latter, and
charge pressure operated means in the discharge
cap for moving the valve inwardly ot the car
-10
tridge to unseat the valve.
'
'
'
10. In combination, a blasting cartridge hav
ing a chamber for receiving a blasting charge the
pressure of which is to be built up to the dedred
blasting pressure, a discharge cap threadedly
15 connected to the cartridge, a valve seat forming
ring and a packing ring clamped between por
tions of the cartridge and said cap, a valve head.
held against said seatxby the pressure ,of the
charge within the cartridge, mechanism within
the discharge'cap for unseating said valve head
when said mechanism is‘ ‘subjected to the pres
sure of the charge‘ within the cartridge, and
meansoperated by the charge pressure for con
trolling application of said charge pressure to
said mechanism.
'
11. In combination, a blasting cartridge hav
ing a chamber for receiving a blasting charge
and provided with a discharge orifice. and dif
ferential release mechanism operated by the
blasting charge when the pressure 01 the same
reaches a predetermined value for discharging
controlling said ?ow path adapted to be unseated
by the blasting charge-when the pressure at the
same reaches the desired value, and means op
erated by the pressure ot the charge ?owing past
said unseated valve tor electing and maintaining
full opening of the latter.
14. In combination, a blasting cartridge had“
a chamber for receiving a blasting charge and
provided with a discharge orifice, and diilerential
release mechanism operated by the blasting
charge when the pressure or the same reaches a
predetermined value for discharging the blasting
charge, said mechanism comprising a discharge
orifice control valve normally subjected to the
pressure of the blasting charge, a piston or greater
transverse area than said valve operativelycon
nected to the latter and normally subjected ‘to
atmospheric pressure when said chamber is
charged, a ilow path for conducting a portion or
the‘ blasting charge from said chamber to one
side of said piston, a spring loaded valve ior con
trolling said ?ow path adapted to be umeated
by the blasting charge when the pressure or. the
same reaches the desired value, and a plunger
subjected to the pressure or the charge ?owing
past the unseated valve for eilecting and main
taining full- opening of the latter.
the blasting charge, said mechanism comprising
15. In combinatloma blasting cartridge having
a discharge ori?ce control valve normally sub ‘a chamber for receiving a blasting,‘charge the
jected to the pressure or the blasting charge, a pressure of which is to be built up to the desired
piston of greater transverse area than said valve blasting pressure, release means for the blasting
operatively connected to the latter and normally
subjected to atmospheric pressure when said
chamber is charged, means ‘operated by the blast
charge, a control chamber, means in said control
chamber for opening said release means when
a portion of the blasting charge is admitted to
the control chamber, means carried by the‘con
trol chamber means and subjected to the pres
sure or the charge in’the ?rst-mentioned cham
charge to eil'ect opening of said-valve, and means . ber for admitting the blasting charge to the con
for causing the piston to maintain said valve open trol chamber when the pressure of the blasting
until the blasting charge is completely discharged. chargereaches a predetermined value, and means
12. In combination, a blasting cartridge hav
for maintaining the control‘ chamber subjected
ing a chamber for receiving a blasting charge and to the pressure of the blasting charge until the
provided with a discharge ori?ce, and differen
entire charge is released.
tial release mechanism operated by the blasting
16. In combination, a blasting cartridge hav
ing charge when the pressure of the same reaches
the desired value for causing the piston to be
subjected to and moved by the pressure oi’ the
charge when the pressure otthe same reaches a
predetermined value for discharging the blasting
charge, said mechanism comprising a discharge
ori?ce control valve normally subjected to the
pressure of the blasting charge, a piston 01' great
er transverse area than said valve operatively
connected to the latter and normally subjected
ing a chamber for receiving ablasting charge
the pressure oi.’ which is to be built up to the
desired blasting pressure, a discharge cap 'at
tached to the cartridge, and means embodied in
the discharge cap for releasing the charge from
said chamber when the pressure of the charge
reaches a predetermined value. said means in
to atmospheric pressure when said chamber is ‘ cluding a charge release valve held closed by
charged, a ?ow path for conducting a portion oi!
the blasting charge irom said chamber to one side
of said piston, a spring loaded valve for control
ling said ilow path adapted to be imseated by the
blasting charge when the pressure of the same
reaches the desired value, and means for eii'ecting
and maintaining full opming of the spring loaded
valve.
65
.
13. In combination, a blasting cartridge hav
irg a chamber for receiving a blasting chargeand
provided with a. discharge ori?ce, and diilerential
release mechanism operated by the blasting
charge when the pressure 01' the same reaches a
70
predetermined value for discharging the blasting
charge, said mechanism comprising a discharge
ori?ce control ' valve normally subjected to the
pressure of the blasting charge, a piston of great
er transverse area than said valve operatively
75 connected to the latter and normally subjected to
the pressure of the charge, a piston connected
to the valve for opening the same when sub
jected to the pressure of the charge. means op
erated by the pressure of the charge for sub
jecting the piston to the charge pressure, and
means for maintaining the piston subjected to
the charge pressure until the entire charge is
released.
.
‘
4 17. In combination, a blasting cartridge hav
ing a chamber for receiving ‘a blasting charge
the prwsure- of which is to be built up to the
desired blasting pressure, a discharge cap at
tached to the cartridge, and meanstembodied
in the discharge cap for releasing the charge from
said chamber'when the pressure of the charge
reaches a predetermined value. said means in
cluding a. charge release valve held closed by
the pressure of the charge, a piston connected
to the valve for opening the same when sub
5
2,122,706
jected to the pressure of the charge, means car
charge releasing valve held closed by the pres
ried by said piston and operated by the pressure
sure of the charge, a hollow piston having a rod
of the charge for subjecting the piston to the connected to the valve for opening the latter
charge pressure, and means for maintaining the when the piston is subjected to the pressure of
piston subjected to the charge pressure until the the charge, a passageway through the valve and
entire charge is released.
rod connecting the charge receiving chamber and
18. In combinatiomva blasting cartridge hav
the bore of the piston, means in the piston bore
ing a chamber for‘receiving a blasting charge ~ for controlling ?ow 0f the blasting charge
the pressure of which. is to be built up to the
through said passageway to cause the piston to
desired blasting pressure, a discharge cap at
be subjected to the charge pressure, said last
tached to the cartridge, and means embodied in mentioned means including a blasting pressure
the discharge cap for releasing the charge from operated compound valve assembly, and means
said chamber when the pressure of the charge
for holding said valve assemblies open until the
reaches a predetermined value, said means in
entire blasting charge is released.
cluding a charge releasing valve held closed by
22. In combination, a blasting cartridge hav
the pressure of the charge, a hollow piston con
ing a chamber for receiving a blasting charge
nected to the valve for opening the same when. and provided with a discharge ori?ce, and dif
subjected to the pressure of the charge, means
ferential release mechanism operated by the
located in the bore of the piston for causing the blasting charge when) the pressure of the same
piston to be subjected to the charge pressure, and reaches a predetermined value for discharging
means for maintaining the piston subjected to the blasting charge, said mechanism comprising
the charge pressure until the entire blasting a discharge ori?ce control valve normally sub
charge is released.
jected to the pressure of the blasting charge, a
19. In combination, a blasting cartridge hav
piston of greater transverse area than said valve
ing a chamber for receiving a blasting charge operatively connected to the latter and normally
the pressure of which is to be built up to the
subjected to atmospheric pressure when said
desired blasting pressure, a discharge cap at
chamber is charged, means operated by the blast
tached to the cartridge, and means embodied in ing charge when the pressure of the same reaches
the discharge cap for releasing the charge from the desired value for causing the piston to be
said chamber when the pressure of the charge subjected to and moved by the' pressure of the
reaches a predetermined value, said means ‘in
charge to effect opening of said valve, and means
cluding a charge releasing valve held closed by for maintaining the piston subjected to the charge
the pressure of the charge, a hollow piston hav
pressure until the entire blasting charge is
ing a rod connected to the valve for opening the
released.
valve when the piston is subjected to the pres
23. In combination, a blasting cartridge hav
sure of the charge, a passageway through the
ing a chamber for receiving a blasting charge
valve and rod connecting the charge receiving the pressure of which is to be built up to the
chamber and the bore of the piston, and means
desired blasting pressure, release means for the
in the piston bore for controlling the ?ow of the blasting charge, a control chamber, means in
40 blasting charge through said passageway to cause
said control chamber for opening said release
the piston to be subjected to the charge pressure means when a portion of the blasting charge is
and to be maintained subjected to said charge admitted to the control chamber, and means car
pressure until the entire blasting charge is‘ ried by the control chamber means and sub
released.
i
jected to the pressure of the charge in the ?rst
20. In combination, a blasting cartridge hav ‘mentioned chamber for admitting the blasting
ing a chamber for receiving a blasting charge charge to the control chamber when the pressure
the pressure of which is to be built up to the
of the blasting charge reaches a predetermined
desired blasting pressure, a discharge cap at
value and for maintaining said control chamber
tached to the cartridge, and means embodied in subjected to the blasting charge pressure until
the discharge cap for releasing the charge from the pressure in the ?rst-mentioned chamber drops
said chamber when the pressure of the charge to atmospheric pressure.
reaches a predetermined value, said means in
24. In combination, a blasting cartridge hav
cluding a charge release valve held closed by ing a chamber for receiving a blasting charge
the pressure of the charge, a hollow piston hav
the pressure of which is to be built up to the
ing a rod connected to the valve for opening desiredblasting pressure, a discharge cap at
the latter when the piston is subjected to the tached to the cartridge, and means embodied
pressure of the charge, a passageway through in the discharge cap for releasing the charge from
the valve and rod connecting the charge receiv
said chamber when the pressure of the charge
ing chamber and the bore of the piston, means reaches a predetermined value, said means in
.' 00 in the piston bore for controlling ?ow of the cluding a charge releasing valve held closed by
blasting charge through said passageway to cause the pressure of the charge, a hollow piston hav-'
the piston to be subjected to the charge pressure, ing a rod connected tolthe valve for opening
said last-mentioned means including a spring '
pressure of the charge, a passageway to the valve
pressed valve open until the entire blasting charge
.and rod connecting the charge receiving chamber
and the bore of the piston, and means in the
piston bore for controlling ?ow of the blasting
21. In combination, a blasting cartridge having
a chamberfor receiving a blasting charge the
pressure of which is to be built up to the desired
blasting pressure, a discharge cap attached to
the cartridge, and means embodied in the dis
charge cap for releasing the charge from said
chamber when the pressure of the charge reaches
a predetermined value, said means including a
10
20
30
40
45
60
the latter when the piston is subjected to the
pressed valve, and means for holding said spring
is released.
in
charge through said passageway to cause the
piston to be subjected to the charge pressure,
said last-mentioned means including a needle 70
valve and a plunger valve successively subjected
to the charge pressure.
FRANK H. ARMSTRONG.
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