close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2129388

код для вставки
Sept. 6', 1938.
J. TAYLOR ET AL
BLASTING EXPLDSIVE DEVICE
Filed April 10, 1935
‘James Ta [or
INVENTORS
‘ATTORNEY.
Sept. 6, 1938. '
J. TAYLOR El‘ AL
'
2,129,388
BLASTING EXPLOS IVE DEVICE
Filed April 10, 1955
2 Sheets-Sheet 2
James T615202‘
W'i/Zz'am yaunj
INVENTORS
BY W‘
ATTORNEY.
2,12,388
Patented Sept. 6, 193a
UNITED
PATENT OFFlC
2,129,388 ‘
BLASTING EXPLOSIVE DEVICE
James Taylor and William Young, Saltcoats, Scot
land, assigncrs to Imperial Chemical Industries
Limited, a corporation of Great Britain
Application April 10, 1935, Serial No. 15,643
In Great Britain April 20, 1934
14 Claims.
This invention relates to devices for use in
blasting, the said devices being of the kind in
which a charge of gas-producing materials, to
gether with a suitable initiating‘ device, is en
5 closed in a rigid container provided with a clo
sure member adapted to release the gases from
the container at a predetermined pressure so that
‘
a blasting effect -is_ produced in the borehole, the
body of the container being su?iciently strong to
‘.0 withstand theexplosion and being capable of re
utilization. The gas-producing charge may com
prise a slow burning explosive, such as black
powder, or any other suitable gas forming mate
rial such as for example, a highly compressed or
5 lique?ed gas. 'The ‘charge may also comprise a
chemical mixture capable of undergoingan exo
1 thermic reaction'with generation of gas when
suitably initiated, although not adapted to react
under normal conditions with explosive violence.
:0 ,gInv blasting devices of the kind described the
‘ gas‘ release member usually takes the form of a.
rupturablesteel disc sealing a vent from the con
tainer and held in place by a hollow cap screwed
, to the‘ container.‘ It has also been proposed to
i; employ a suitably adjusted valve or other‘me
chanical form of release device similarly situ
ated within a hollow cap. ,Discharge caps of
this nature are provided with, channels or ports
I through which the gases escape and these chan
0 nels or parts have hitherto consisted of a single
, row of radial apertures formed at right angles to
(0!. 102-6)
three series of apertures lying in separate planes
but preferably not more than ?ve.
Discharge caps constructed in accordance with
the present invention permit of very eiiicient
venting of the gases generated in the container 01
over a relatively large area of the borehole.
The
rapid and e?icient venting of the gases mini‘
mizes any risk of bursting or cracking of the
head.
.
.
It .will be understood that the caps of the pres- l0
ent invention are relatively long (for agj-given di
ameter) as compared with the caps hitherto em
ployed in the art. It will also be understood that
the amount of material removed from the cap to
‘form the venting apertures must not be so great 15
as 'to weaken the cap mechanically and the in
vention provides a method whereby the ratio of
the venting area to the internal cross sectional
area may be increased considerably without the
necessity of increasing the diameter of the cap 20 '
and hence the diameter of the borehole.
According to a further feature of the invention
the venting apertures are located at an acute
angle to the longitudinal axis of the discharge
cap and in a backward direction in the manner 25
' described and claimed for a single row of aper
tures in pending application No. 752,924.
In order to improve still further the eil'icient
venting of the gases the length of the blasting
‘cap occupied by the venting apertures may be 30
formed with a slightly reduced external diameter
the longitudinal axis of the cap and having a - as compared with the external diameter of the
total ventingarea usually approximately equal to remaining length of the cap’ and the diameter of
the cross sectional area of the container.
the container.
5 _ According to the present invention a blasting
If desired, a small axial hole may be provided 35
in‘the head of the cap so that the interior may
device of the kind described comprises a contain
be clearedv by means of a punch if part of the
I er of substantially uniform cross ‘section through
out at least the greater part of its length, and an ruptured sealing disc should become jammed
elongated cap provided with a plurality of rows therein. Alternatively, the discharge cap may
0 of venting apertures of about the customary size be modi?ed to permit of the expulsion of the 40
distributed uniformly over the cylindrical surface sealing disc by suitably increasing the size and
of the cap, the total-cross sectional area of the , modifying the shape of one of the forward aper
venting apertures being considerably greater than tures. It is necessary, however, simultaneously
the internal cross sectional area of the container. to modify one of the venting apertures at the re
5 \It‘is preferred thatthe total area of the venting ~ mote side of the cap so that the total venting 45
apertures should be at’ least twice the internal area is stilluniform about the longitudinal axis.
cross sectional area of the container but prefer=:._ Various forms of the invention will now be de
ably not exceeding four times this area although scribed with reference to the accompanying
bene?cial'results may be obtained when the ratio drawings in which Figure l is a longitudinal sec
0 is as great as ?ve to one or even higher.
The venting apertures are preferably located
so that their centres lie in a plurality of planes
spaced substantially uniformly along the lon'gi
. tudinal axis of the‘ cap and perpendicular there
5 to. It is preferred‘ that there should be at least
tion_ showing a cap in position in a container and so
constructed in accordance with the invention.
Figures 2, 3, 4 and 5 show in longitudinal section
alternative forms of cap which may be used with
the same container indicated in Figure 1.
Referring to Figure 1, the cap I constructed of 55
2
greases
peripherally on the other side of the cap. The
metal is attached to the Container 2 by means
of a screw thread 3, a bursting disc 6 being ing
axial aperture indicated at the head of the cap
e
, posed between the' container and the cap.
as in Figures 1 and 2 is omitted. In the jeep
external diameter of the cap is the same as that I illustrated in Figure 4 provision for the escape 5 of
the ruptured sealing disc is made by slotting
longitudinally two opposite ports in the most
of the container. The internal diameter 5 of
the container in uniform throughout substantially.
the whole length thereof; but is\ restricted at‘ the
end to form a throat _6 adjacent to the bursting
1 disc. The cap is provided with an axial passage
forward row M.
_
_
.I
The cap illustrated in Figure 5 is substantially
identical with the can illustrated in Figure-2 with} _
the exception that a‘ thepbrtsa e at‘ right angles 10
7 and this passage communicates with theexte
rior by means of three groups of ports 9, l0 and to the longitudineifaxis?'rh dimensions-oi the H . Each group consists of four vports equally 'cap and the ratiooflthe vesting‘. area ‘to tn'em- ~
spaced around the discharge cap and lying in a.‘ ,
p
, jitheisame
ternal cross
as insectional
the'cap. illustratedin'li'igure.
area-of *the'" container
2. are. '
plane at right angles to the‘. longitudinal axisl'of
15
the container and cap;
Theintermediate group‘?
"
of ports i0 is staggered-with respect 'toigthe other _ .
-
‘ ‘
‘
"1
'
'1. _A__blasting olevi‘oer-bf~.'_tlie_1kind‘described?eomi-v -
two groups 9 and II so thattheradial'direction . prising a container ‘of- substantially uniform, cross ..'
of each of the ports in-any. row is‘flatlan- angle voi?
section throughout‘ at least the greater part of its
45° with the direction .of ports‘ in?‘ each "adjacent , length, ‘and anelongatedcap provided with a
20 row.‘ A small axial aperture'8'-is~-provided in the plurality of rows of venting apertures distributed
head of the cap for the purpose "of, clearing the uniformly over the cylindrical surface of the cap;
ruptured sealing disc 'if' it should become-jammed the total cross sectionalarea of the venting aper
tures being at least 3% times as large‘ as the in
inAthetypical
interior.
container for use in ‘ the
'
‘present
I
ternal cross sectional area of the throat of said
-
25
invention may comprise a cylindrical. tube. of
mild steel 20.5 inches long, having internal and
external diameters of 1%" and 1%" respectively,
and a constriction at the venting end of 34”
container.
2. A blasting device of the type wherein a
charge of' gas-producing material isenclosed vin a
pressure-resistant container provided with‘ a
member adapted to permit the escape'ofrgasesat
30 may be obtained by employing a bursting disc a predetermined and considerable pressure, lsaid 30
adapted to rupture at about 13 tons per square blasting device comprising .a container'jof sub
diameter.
With such a container good results
inch and a cap constructed in the manner illus
trated having an internal diameter of 3A” and
provided with ports of 1/2" diameter. In the form
stantially uniform cross section throughout at,
least the greater part of its length, but provided '
with a restricted throat, and ‘an elongated ‘cap
35 illustrated in which there are 12 ports in all the ' provided with at least three but not more‘ than 85
ratio of the venting area to the internal cross five rows of venting apertures distributed .uni'-.
sectional area of the container is approximately formly over the cylindrical surface of the cap,
2 :1.
'
‘
the total cros_s—sectional area of the venting
By comparison with this cap constructed in apertures being at least 3% but not more than
40 accordance with the present invention a typical
6% times the internal cross-sectional area of th 40
cap hitherto employed in the art as suitable for
the same container is provided with one row only
of 4 venting apertures of %" diameter, the total
venting area being equal to the internal cross
45 sectional area of the container.
_
throat of said container.
‘
3. The blasting device of claim 2, inwhich the
venting apertures in ‘each row are staggered‘ with
respect to the venting apertures: in each adjacent
TOW.
'
>
,
j
4'
-
Referring to Figure 2, the cap illustrated is de
,4. A blasting device‘ of _ the‘ "type wherein ‘a
signed for use with the same container as indi
charge of gas-producing material is enclosed in a
cated in Figure 1, and the reference numerals ‘pressure-resistant container provided with a
employed have the same signi?cance as in the member adapted to permit the escape of gases at
description of Figure l, but in this cap there are a predetemined and considerable pressure, said
provided ?ve rows of. ports, three rows 9, i I and blasting device comprising a container of sub
I3 being in line with each other, and two inter
stantially uniform cross section throughout at
mediate rows l0 and it’ being staggered with re "least the greater part of its length, but provided
spect thereto at a radial inclination of 45°. All with a restricted throat, and an elongated cap
the ports are pierced at an angle of about 60° provided with at least three but not more than
with the longitudinal axis of the cap. The exte
?ve rows of venting apertures, the centers ofv
rior of the cap is recessed as indicated at the which lie in a plurality of planes spaced sub—_
upper end it and the lower end 85 so that the cap
stantially uniformly along the longitudinal axis
is reduced in diameter over that part of its length
60 which is occupied by the ports. The'cap' may be
constructed of similar dimensions to that de
of the cap and substantially, perpendicular there
to, the total cross-sectional area of the venting
apertures being at least 3% but not more than
to
scribed in Figure 1, it being understood that the ' 6% times the internal cross-sectional area of the
- length is suitably increased to accommodate the"
two additional rows of ports.
The cap may con
veniently be 6%?’ long excluding the screw
threaded end, the ports being distributed over a
length of 4%". The ratio of the total venting
area 'to the cross sectional area of the container
is 3.6 :1.
Referring to Figure 3, the cap is provided with
only three rows of ports but in place of‘ one of
the ports of the most forward row a deep slot I6
is cut longitudinally in order to permit the es
cape of the ruptured sealing disc, and this aper
75 ture is balanced by a second slot ‘ll cut
70.
throat of said container.
'
5. The blasting device of claim 4, in which the
venting apertures in each row are staggered with 65
respect to the venting. apertures in each adjacent
row.
>
-
6. The blasting device of claim 4, in which the
axes of the venting apertures form'acute angles
with the longitudinal axis of the cap, the apices 0
of which angles point toward the‘ top of [said cap.
7. The blasting device of claim 4, in which that -
portion of the discharge capwhich is ‘provided
with venting apertures has an- external diameter ~
slightly smaller than that of the container.
76
2,129,888
8. A blasting device of the type wherein a
charge of gas-producing material is enclosed in
a pressure-resistant container provided with a
member adapted to permit the escape of gases at
a predetermined and considerable pressure, said
blasting device comprising a container of sub
stantially uniform cross section throughout at
least the greater part of its length, but provided
with a restricted throat, and an elongated dis
charge cap provided with at least three but not
more than ?ve rows of venting apertures, the
centers of which lie in a plurality of planes
spaced substantially uniformly along the longi
tudinal axis of the cap and perpendicular thereto,
the venting apertures in each row being staggered
with respect to the venting apertures in each ad
jacent row, the axes of said venting apertures
forming forwardly-pointing acute angles with the
longitudinal axis of said cap; and the total cross—
20 sectional area of the venting apertures being at
least 3%; but not more than 6% times the inter
nal cross-sectional area of the throat of said con
tainer.
9. The blasting device of claim 8, in which one
25 of the forward apertures of the cap is modi?ed
to permit the expulsion of the sealing disc after
rupture, a corresponding modi?cation being made
in an aperture on the other side of the cap.
10. The ‘blasting device of claim 8, in which
30 that portion of the discharge cap having venting
apertures exhibits an external diameter slightly
smaller than that of the container.
11. A blasting device of the type wherein a
charge of gas-producing material is enclosed in a
_pressure-resistant container provided with a
member adapted to permit the escape of gases at
a-predetermined and considerable pressure, said
blasting device comprising a container of sub
stantially uniform cross section throughout at
least the greater part of its length but provided
. with a restricted throat and an elongated cap
provided with at least three but not more than
?ve rows of venting‘ apertures distributed uni
formly over the cylindrical surface of the cap,
the total cross-sectional area of the venting aper
tures being at least twice but not more than four
times the internal cross-sectional area of the con
tainer, and at least 3% but not more than 6%
times the internal cross-sectional area of the
throat of said container.
3
12. A blasting device of the t3, wherein a
charge of gas-producing material is enclosed in a
pressure-resistant container provided with a
member adapted to permit the escape of gases
at a predetermined and considerable pressure,
said blasting device comprising a container hav
ing internal and external diameters of approxi
mately 1%" and 1%" respectively, and a con
stricted throat of approximately %" diameter at
the venting end, and an elongated cap provided (l
with twelve ports of approximately 1/2" diameter
13. A blasting device of the type wherein a
charge of gas-producing material is enclosed in a
pressure-resistant container provided with a
member adapted to permit the escape of gases at 15
a predetermined and considerable pressure,’ said
blasting device comprising a container having in
ternal and external diameters of approximately
11/4" and 1%" respectively, and a constricted
throat of approximately %" diameter at the _
venting end, and an elongated cap provided with
?fteen ports of approximately 1/2” diameter.
14. A blasting device of the type wherein a
charge of gas-producing material is enclosed in
a pressure-resistant container provided with a
member adapted topermit the escape of gases at
a predetermined and considerable pressure, said
blasting'device comprising a container of sub
stantially uniform cross section throughout at
least the greater part of its length, and an elo'n 30
gated discharge cap provided with at least three
but not more than ?ve rows of venting apertures,
the centers of which lie in a plurality of planes
spaced substantially uniformly along» the longi
tudinal axis of the cap and perpendicular thereto, 35
the venting apertures in each row being staggered
with respect to the venting apertures in each
adjacent row, the axes of said venting apertures
forming forwardly-pointing acute angles with the
longitudinal axis of said cap; one of the forward 40
apertures of said cap being modi?ed to permit
the expulsion of the sealing disc after rupture,
a corresponding modi?cation being made in an
aperture on the other side of said cap, and the
total cross-sectional area of the venting apertures 45
being at least twice but not more than four times
the internal cross-sectional area of the container.
JAMES TAYLOR.
WILLIAM YOUNG.
50
Документ
Категория
Без категории
Просмотров
0
Размер файла
594 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа