Improvements in Detonators.
Year: 1899

page_text: Date of Application, 1st Dec., 1899-Accepted, 6th Jan.,
1900
COMPLETE SPECIFICATION.
Improvements in Detonators.
I, JOHN WILLIAM FOWLER, of Whangarei Heads, Auckland, New Zealand, Ship
Engineer, 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:-
Hitherto it has been usual to secure detonators upon the ends of fuses by tying
with a piece of string or the like. The objects of this invention are so to con-
struct the detonator that tying is unnecessary, to remove liability of explosion
when introducing the fuse into the detonator, or when the same is subjected to
accidental concussion; and to secure the easy and safe withdrawal of a charge
when circumstances necessitate this to be done.
To the bottom of the cap, I form a well or recess to receive the nitroglycerine,
which is thus protected from friction arising when the end of the fuse is fitted
into the cap.
I envelope the detonator in a covering or bag of india rubber or similar
material to prevent the detonator exploding if it should be accidentally dropped
or otherwise violently struck, and to securely hold the fuse when inserted.
The drawing appended to this specification illustrates the invention.
Figure 1 is an exterior view of the detonator.
Figure 2 is a longitudinal section of the same with the india rubber cover.
Figure 3 shews the exterior of the detonator, with the cover in section and
partially rolled back.
Figure 4 is a cross section on line A-A Figure 2.
Similar figures of reference indicate corresponding parts.
(1) is the metal cap of the detonator made preferably of copper and cylindrical
in shape, (2) is a well or recess formed in the bottom, (3) is nitroglycerine, (4) an
outer cover of india rubber or the like.
A roll (5) is formed around the rim of the cover (4).
The fuse is made to fit tightly in the cap (1), the rubber cover (4) is then
passed over the said cap, so that its roll (5) grips the fuse, which is thus held in
position before being placed in position for firing, or when it is necessary to
withdraw the detonator.
The end of the fuse rests upon the shoulder (6) and is thus prevented from
reaching the nitroglycerine (3).
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a detonator, a well or recess in the bottom of the cap to hold the nitro-
glycerine, substantially as set forth.
2. In a detonator, a rubber bag or covering to envelope and protect the cap
from the result of concussion; substantially as set forth.
3. In a detonator, a rubber bag or covering to envelope and protect the cap
D

page_text: from the result of concussion and a roll on the rim of the cap to hold the fuse
in the cap substantially as set forth.
4. The improvements in detonators consisting of parts constructed arranged
and operating, substantially as set forth.
Dated this 1st day of December 1800
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.