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Патент USA US2115388

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April 26, 1938-
Filed Oct. 8, 1934
‘ 2,115,388
2 SheetsI-Sheet 1
April 26, 1938-
Filed 001:. 8_, 1934
2 Sheets-Sheet 2
wwma’wwm ’
lsatented Apr.~>26, 1Si38
‘ um'rsn .sm'rss ‘ PATENT _
Richard J. lieitzm'am, Shamokin, Pa., assignor .
‘or one-fourth to William ‘E. Ressler, Shamokin,
Application October 8, 1934, Serial Nat-11435
-4 Claims. '(Cl. 102-11)
This invention relates to; blasting plugs and is of‘ which the same characters of reference have
an improvement upon the type of blasting plug been employed to denote identical parts:
, :described'and claimed in my Patent No. 1,896,817. _
Figure 1 is a longitudinal section through _a
granted February '7', 1933. The present improve‘- " bore hole showing one form of my improved
v;,'~ ment as well- as: therblasting plug forming. the
blasting, plug in position with respect to the dy- 5
subject. matter of said patent is particularly em-' namite and the sand packing;
ployed in mining and quarrying and has for its .. Figure 2 is a perspective view of the blasting‘
‘ general ‘object to increase the safety factor of plug'shown in Figure 1;
v e -
such devices by avoidingthos'e causes of mis?re
Figure 3 is an end elevation;
10 ordinarily attributable to short circuiting, and
Figure 4 is a perspective view of a cylindrical 10
should a mis?re occur through inherent- defect - sponge rubber blasting plug;
in the detonating cap, the invention affords a safe - ,
means for the extraction ofthe detonatingicap
irom the bore hole.
Figure 5 is a perspective view partly in sec
tion through a cylindrical soft rubber plug hav
' ing a single wire slot extending throughout the '
The characteristic features of the ‘invention
‘length thereof;
‘ covered in the patent aforementioned are the
absence of metal in the construction of the blasting plug and the provision of an expansible ante._
‘view and end elevation of a cylindrical soft blast
ving plug having'two wire slots;
., rior portion which under the tamping pressure ‘
20 spreads to conform to the wall of the bore hole
Figures 6 and 7 are respectively a perspective
Figures Band 9 are similar views showing
another form of. the invention in which the blast- ‘20
_ in a ?rm and gas-tight manner, the rear portion ' 'in'g plug is of relatively hard material and. pro
being of such nature as to be'readily penetrated
vided’with asingle wire slot;
byan auger for the purpose-of effecting the with-drawal of the plug invthe event of a mis'?re." Since
' Figures‘ 10 and 11 are similar views showing a
plug of hard rubber or its equivalent having two ’
25 short circuiting is ordinarily caused by abrasion .late'ral wire slots;
. of one of the wires leading to the vdetonating capFigure 12 is a perspective view of a hard blast
incident to the friction of tamping, the invention ing plug having no provisions for the wires; _
‘of the patent safeguards the wires by providing Figure 13' is an end elevation of the same;
i _ a separate bores in the plug through which the
Figures 14 and 15 are respectively a perspec- .
*"3oWiYeS are Separately. threaded, keeping them tive view and end elevation of a composite plug 30
.apart from one another and away from the wall
of the bore hole.
havingthe anterior portionsoit and the posterior ' a portion hard with a single wire slot extending
In practice however'it has been found at times
somewhat di?cult to thread the.‘ wires through
the bore holes on account or insuf?cient illumination in the mine or the ravelled nature of the
mi. G!
_ insulation of the ‘wire at its free ends.
The pres-
entv invention thereforehas for its speciiicob_
through the hard portion only; and
. Figures 16 and 1'7 are similar views showing the
composite vplug with the wire slot extending 35
through both the hard and soft portions.
Referring now in detail to ‘the several ‘?gures
and ?rst adverting to that form of the inven
ject the provision of lateral slots. into which the ' tion shown in Figures 1,; 2.and 3, the numeral
’ 40 wire may be pressed and retained, on voperation i represents a plug preferably of conical form 40
vwhich can be performed bythe sense of feeling throughout its anterior portion, and having a
alone and_:_which can bedoneif need be in the ' cylindrical‘zone 2 at its posterior end, with an
intermediate taper 3. The‘ entire plug is pref
.- ‘.v .Another object of the invention is to makethe
erably made of a vsoft”compressible material such' ' i
45 blasting plug :of such yielding material that even _[ as sponge rubber which vmaterial has not only the :45
in the absence of 'any‘bore for receiving the wires” advantage ‘of inherent softness, but also has'lm- v
'> _ the same may be: placed alongside the plug in‘ ~prisoned air‘bodies which assist. in cushioning
_ -
‘ customary manner-as .itis inserted in the bore -' the impact of the explosion. A lateral slot 6 for
’ hole and the- plug will yield to the shapeof the receiving the ignition wires is ‘formed in ‘the
5g) givireishas it is tamped into place, without abrad-
cylindrical vz'onev and opens into the tapered por- 5(1
tion 3. Figure 3 shows that the slot may'consist
Other objectsrofjlthe invention will appearasvv of 1a tubular recess opening to the exterior plug
- the following. description of a number of -_'em- .by amerefsliti which'spreads to admit the wires
bodiments of the invention proceeds.
and then springs back into closed position so
55- > In thedrawingslthijoughout the several ?gures . that the slot 4 completely encompasses the wires 55
shielding them from coming in contact with the,‘
l8 for the reception of the two‘ ignition .wires
wall of the bore hole. The posterior end of the
cylindrical zone is preferably concaved to guide
whereby when the plug is driven into placethe
wires are protected-from being'abraded against
the tamping rod or‘ ram so' as to avoid its vcorn
ing in contact with ‘the wires at'their point of ' ' the wall of the bore hole.»
In this form of the
invention ‘no provision is made for sealing the‘ 5
emergence from the plug at which point they are
close together and special precaution must be
plug in the gas~tight manner its sole claim to ’
‘taken to prevent the insulation becoming dam-7' patentability being v‘in protecting the wires. It
is also characterized by being non-metallic and
the posterior end is readily penetrable by an
‘In practice, the sticks 'of dynamite 6 having
auger for removing the plug: On account of the w
been put in place in the bore hole with the det- ' - peripheralv
position .of
the wires there is no risk .
of the auger boring into the wires.
onating cap J embedded in the last stick and.
the wires 8 and {leading therefrom to the ex
terior of ‘the bore hole, the safety plug is taken
15 and, the two wires 8 ‘and 9 pressed through the
slit 5 into the‘slot 4.. The blasting plug is then
thrust into the bore hole and slid along. the
‘v The plug ‘l9 shown in Figure 10 is similar to
that‘ shown in Figure}! ‘excepting'that there are
two longitudinal grooves 20 and 2|, one for each 15
' of the ignition wires.
Figures 12 and 13 show a hard rubber plug of
and having no provision for
wires under the pressure of theram or tamper
until its anterior end comes adjacent the ?nal
20 stick of dynamite. Further action of the tamper
safeguarding the ignition wires. It is readily re- . _
movable by'means of an auger
or ram causes‘ the soft rubber to expand radially
- of producing a spark;
?lling the bore hole and coming into intimate
' ' Figure 14 shows a composite blasting plug hav-i ’
and sealing relation with’ the wall of the bore
ing the anterior portion ZSformed of soft mate
hole. The enlarged cylindrical portion of‘ the ‘ rialas
blasting plug forms a-tightseal against the wall -.tion such
sponge rubber and the posterior por-f
24 being-made.
of hard material such for 245
of the bore hole preventing the escape of gases
\' - example as hard rubber.
untilrthe explosion has expended its vforce.
The hard portion-has
‘an open groove 25 extending, therethrough, but '
In view of the fact that the portion I is coni
cal, it does not come into intimate contact with
the soft portion is devoid of any such groove. The
wires are introduced laterally into the groove 2! -
30 the wires until the blasting plug has been pushed
entirely into place.
Consequently, there is no
’ tendency to abrade' t e wires against the wall of
the bore hole.
If a mis?re occurs it is an ‘easy, matter to ‘
insert an anger, boring into the posterior portion
of the blasting plug and to draw it out without
the risk of sparks which might cause an explg
portion, Hi In this, instance-both portions are
_ si on.
nally therethrough
with an open
slot extending
the , ‘
In Figure 4 a form of the invention is shown
_ ignition wires.
in which the blasting plug I0 is an. undi?feren- '
ti'ated cylinder of soft material such as sponge '
be of ‘the portion
which extend from the groove II.
Figure 16 shows a composite plug 26 having a"
‘soft anterior portion 21 and a hard posterior 35
While I have in thelabove description defined 40
rubber, no slots being provided for the, protection.
of the wires. This cylinder is pushed into the.
bore hole with the tamper, its-yielding nature;
causing it to conform to the wires'as it is pushed
in. When it is in ?nal position, a few blows with
the tamper expand it radially'and retain it‘ in
Figure '5' is a blasting plug ll of. similar shape‘
andmaterial, but in this instance a slot 4 ex'— '
tends longitudinally therethrough and opens in
extending longitudinally therethrough and open- '
the lateral surface of the plug by means of they ing
the ‘lateral ‘surface of said plug, the.
slit- 5 which closes‘. after the wires have been
pushed in.
The manner of inserting this plug is l ' posterior end of said plug being concave;
55 the same as in the previously described modi?- I a
In those forms of the invention which have
been described up to the present time,‘ both wires. _.3; lateral surface of said body by means of a yield
- ‘
'. '
are introduced into the same slot. "Figures -6‘ and ing-walled‘ narrow slit.
3. Safety blasting plug. comprising a bodyof '
60 7 show a furtherjmodi?catmn of the‘invention'”
‘in which the wires are independently inserted in‘ yielding rubber having. ‘a longitudlnal'bore ex-"oo
different slots. The cylindrical plug I2 is of soft tendingtherethrough communicating with‘ the
material, having a pair of similar bores II and.’ lateral surface ‘of said body by means of a yield-.
t4 extending therethrough in parallel relation i ing-walled slit of'such-normal width'dimensionv and ‘communicating with the lateral surface or ggiasto retain iufsaidborea wire‘ forced through‘ ‘ '
“the plug by means of
slits l5 and. I8.
One‘ of ‘ ,said'slit.
the ignition wires is‘pressed into ,each slot just
before'the plug is introduced in the‘bore hole. » , .>
Figures 8, 9, 10 and 11 are respectively per?
70 spective views and views in-‘end elevation of two
forms of plug which are a departure of those
ingewalled sun said slitibeing of less width’ than ‘70'
forms previously described inasmuch as they are ' the diametrical, dimension’.
in said boreaéwiretforccd through said
of hard material throughout. ' 'I'heplug l1 shown- ‘ ‘all
m'_Figure-8 is’provided with a, singl'e‘open groove
'4. vSafety blasting plug comprising a body of
yielding rubber havingvlla longitudinal bore ex
tendingv therethrough communicating with
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