Improvements in Electric Fuses and Electric Detonator Fuses.
Year: 1899

page_text: Date of Application, 5th Aug., 1899
Complete Specification Left, 20th Feb., 1900-Accepted, 7th Apr.,
1900
PROVISIONAL SPECIFICATION.
Improvements in Electric Fuses and Electric Detonator Fuses.
We, GEORGE SMITH and DAVID CORRIE, Technical Chemists, of Nobel's Explo-
sives Company, Limited, West Quarter Factory, Polmont, in the County of
Stirling, North Britain, do hereby declare the nature of this invention to be as
follows:
:-
This invention relates to improvements in electric fuses and electric detonator
fuses the object of which is to provide a fuse in which the wires are firmly fixed
and cannot be pushed in or pulled out.
The wires or leads consist of two copper wires suitably insulated. They are
braided or lapped together and at one end a lead tube is threaded which is squeezed
to the wires by means of suitable pliers. The flashing mixture is then put on in
the usual way. Or the lead tube, besides fixing the wires, may be so constructed
that they may also be used as a receptacle for holding the flashing mixture.
The fuse head thus prepared is forced into a small tapered copper tube, which
is turned over on to the lead. In this way the lead is firmly fixed into the tube,
the taper and "turnover" of which prevents any movement, either backward or
forward.
This tube is pressed by a machine into the detonator where again the
taper on the small tube engages with the sides of the detonator and makes the
joint so tight that it is impossible to remove the inner tube from the outer, or to
pull the wires backwards or forwards.
To make the inner tube more secure, the edge of the outer tube may be turned
over the inner, which effectually prevents the latter from being moved in any
direction.
We may also press the fuse head direct into the detonator, the tube of which,
being tapered in the same manner as described for the small tube containing
the fuse head.
1000
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow,
Applicants' Patent Agents.
Improvements in Electric Fuses and Electric Detonator Fuses.
We, GEORGE SMITH and DAVID CORRIE, Technical Chemists, of Nobel's Explo-
sives Company, Limited, West Quarter Factory, Polmont, in the County of
Stirling, North Britain, do hereby declare the nature of this invention and in
[Price 8d.]

page_text: what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
-
This invention relates to improvements in electric fuses-and electric detonator
fuses the object of which is to provide a fuse in which the wires are firmly fixed
and cannot be pushed in or pulled out.
In order that our invention may be properly understood and readily carried into
effect we have hereunto appended one sheet of drawings, of which,
Figure 1 is a section of the improved fuse.
Figure 2 is a section of the detonator fuse.
Figure 3 is a modification of the detonator.
Figure 4 is a modification and simpler form of the improved fuse.
The wires or leads a consist of two copper wires suitably insulated. They are
braided or lapped together and at one end a lead tube b is threaded which is
squeezed to the wires by means of suitable pliers. The fuse head thus prepared
is forced into a small tapered tube c of metal or other suitable material, which is
turned over on to the lead. In this way the lead is firmly fixed into the tube,
the taper and "turnover" of which prevents any movement either backward or
forward. The flashing mixture is then put on in the usual way. Or the lead
tube, besides fixing the wires, may be so constructed that it may also be used as
a receptacle for holding the flashing mixture, see Figure 4.
This tube c is pressed by a machine into the detonator tube where again the
taper on the small tube engages with the sides of the detonator and makes the
joint so tight that it is impossible to remove the inner tube from the outer, or to
pull the wires backwards or forwards.
To make the inner tube more secure, the edge of the outer tube may be turned
over the inner, which effectually prevents the latter from being moved in any
direction.
We may also press the fuse head direct into the detonator tube, as, shewn in
Figure 3, the tube of which, being tapered in the same manner as described
for the small tube containing the fuse head.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
The improvements in electric fuses and detonator fuses by which the wires are
firmly fixed by means of a plug or tube of lead or any other suitable metal or
alloy and cannot be pushed in or pulled out, substantially as described.
Dated this 19th day of February 1900.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow,
Applicants' Patent Agents."