Improvements in Electric Fuses for Firing Blasting and other Explosives.
Year: 1899

page_text: Date of Application, 16th Mar., 1899
Complete Specification Left, 30th Nov., 1899-Accepted, 30th Dec., 1899
Improvements in Electric Fuses for Firing Blasting and other
Explosives.
We, GEORGE SMITH and DAVID CORRIE, both of the Works of Nobel's Ex-
plosives Company Limited, at Polmont, in the County of Stirling, North. Britain,
Technical Chemists, do hereby declare the nature of this invention to be as
follows, that is to say:-
This invention has for its object to improve and simplify the formation of
electric fuses for blasting and other operations in which explosives are employed.
In carrying out the invention in the case in which a detonator is used, the
detonator tube of thin copper or other suitable material is first charged with the
fulminate and then some flashing powder is introduced. The ends of the electric
wires are next inserted so as to penetrate amongst the flashing powder, the in-
sulating material on these wires being retained on them up to their extreme
exposed ends. The material of the tube is finally compressed so as to close the
end at which the electric wires enter, and fit closely upon the wires, the wires
being kept apart, by a part of the material of the tube being closed between them.
Each fuse piece may comprise two tubes fixed one within the other a slightly
tapered or bulged form allowing them to be jammed together tightly. The metal
of both tubes is compressed so as to close on the wires.
In a case in which a detonator is not required the wires are simply inserted
into and enclosed in a tube charged with a suitable powder or explosive.
Dated this Fifteenth day of March 1899.
EDMUND HUNT,
Applicants' Agent.
Improvements in Electric Fuses for Firing Blasting and other
Explosives.
We, GEORGE SMITH and DAVID CORRIE, both of the Works of Nobel's Ex-
plosives Company, Limited, at Polmont, in the County of Stirling, North Britain,
Technical Chemists, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention has for its obj ct to improve and simplify the formation of
electric fuses for blasting and other operations in which explosives are employed.
In carrying out the invention, the fuce may be modified to suit various uses.
TP R17

page_text: In the accompanying drawing, the variations in the construction of the fuse
are clearly illustrated.
Figs. 1 shew, in side view, longitudinal section, and end view, our improved
electric detonator fuse, in the preparation of which, some flashing powder is intro-
duced on to the top of the detonator composition; the ends of the electric wires
are then inserted, so as to be immersed in this flashing powder, the insulation
being retained on them up to their extremities.
The wires, before insertion, are formed with a loop, which is intended to be
partially embraced, and held firmly by the tube.
The material of the tube is finally compressed, so as to close the end at which
the electric wires enter, and fit closely upon the looped portion of the wires.
Figs. 2, shew a variation in the construction of the detonator fuse, which in
this case consists of a detonator, into the open end of which is inserted a slightly
tapered or bulged open-ended tube, Figs. 3,--the taper or bulged form being
adopted to allow of its being jammed into the detonator, to ensure the formation
of a tight joint. The outer end of the inner tube is connected to the electric
wires by pressure, as described above, but before inserting it into the detonator,
the wires in this case have the flashing powder attached to them in any suitable
manner.
The parts a and a¹ are connected by endway pressure..
In cases where a detonator is not required, the wires, suitably prepared for
igniting the charge, are inserted into the tube a', and, by compression fixed in it,
and the tube is then afterwards charged with a suitable powder or explosive.
Having now particularly described & ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
-
1). Fixing the electric wires to the detonator by compression of the detonator
tube in the manner above described.
2). The modified construction of fuse parts, as illustrated at Figs. 2 & 3 of the
drawing.
Dated this 29th day of November 1899.