AN IMPROVED APPARATUS FOR STOPPING OR PLUGGING HOLES BORED FOR BLASTING PURPOSES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I JOSEPH CLARK of 160 Burdett Road, London in the County of Middlesex,
Engineer do hereby declare the nature of my invention for AN IMPROVED
APPARATUS FOR STOPPING OR PLUGGING HOLES BORED FOR BLASTING PURPOSES
to be as follows:-
The apparatus consists of a hollow metal bolt with head of such size as to
easily enter the hole to be stopped The hole in centre of bolt to be of sufficient
Bize to admitt the fuse, so as to allow it to be pushed down into contact with the
charge at the bottom of the hole The bolt may be of any required length and
diameter and made of any suitable metal, with nut to suit. A thick india rubber
tube is sliped on to the bolt, the outside diameter of which is such as to allow it to
be pushed easily into the hole to be stoped The ends of india rubber tube are
coned out to suit expansion cones placed at each end of the bolt so that when the
nut is screwed up the india rubber is expanded suficiently to plug the hole,
Double conical distance pieces may be used with india rubber discs or rings
between, The distance pieces may be of wood or any other suitable material.
Dated this 17th day of September 1884.

page_text: COMPLETE SPECIFICATION.
J, JOSEPH CLARK of 160 Burdett Road London in the county of Middlesex
Engineer do hereby declare the nature of my invention for AN IMPROVED
APPARATUS FOR STOPING OR PLUGGING HOLES BORED FOR BLASTING OR SIMILAR
PURPOSES, and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
The apparatus consists of a hollow metal bolt with head of such size as to easily
enter the hole to be stopped, the hole in the centre of the bolt to be of sufficient
Bize to admit the fuse so as to allow it to be pushed down into contact with the
charge at the bottom of the hole. The bolt may be of any required length and
diameter and made of any suitable metal with nut to suit A thick indiarubber
tube is sliped on to the bolt the outside diameter of which is such as to allow it to
be pushed easily into the hole to be stopped. Expansion cones are placed at each
end of the bolt so that when the nut is screwed up, the indiarubber is expanded
Bufficiently to plug the hole. When the plug is very long double conical distance
pieces may be used with indiarubber discs or rings between. The distance pieces
may be of wood or any other suitable material.
The apparatus may be used for stoping blast holes, bursting guns and similar
purposes.
Fig 1 is a section of the apparatus with an expanding cone at top and bottom.
Fig 2 is a modification with a cone at one end and a flat disc at the other end.
Fig 3 is another modification in which the indiarubber tube is subdevided and a
double expanding cone placed between.
A is metal the tube preferably of brass or copper on the ends of which the
expansion cones C C are fitted.
B. is the indiarubber tube which fits over the metal tube.
D represents the nut for tightening up the expansion cones so as to force out the
indiarubber and make it stick in the the blast hole. The top of the nut is slotted
for inserting the spanner.
E. E. E represents end views of the apparatus.
F Fig 3 represents a double cone to be inserted when the indiarubber is sub-
divided.
Having now particularly described and asertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
An apparatus for stoping blast holes consisting of a central hollow metal bolt
for the insertion of the fuse surrounded by a thick indiarubber tube with expansion
cones substantially as and for the purposes hereinbefore described.
Dated this eleventh day of June A.D. 1885.