Improvements in Blasting Fuses, and Tools for Sealing the Caps thereon.
Year: 1899

page_text: Date of Application, 18th July, 1899-Accepted, 7th Oct.,
1899
COMPLETE SPECIFICATION.
Improvements in Blasting Fuses, and Tools for Sealing the Caps
thereon.
I, ARTHUR SHEWAN WILLIAMSON, of Niagara, in the Province of British
Columbia and Dominion of Canada, Merchant, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:
This invention relates to caps or detonators for blasting fuses and to a tool
by which to crimp or seal the caps, the object of the invention being to render
the fuses waterproof and so ensure their action in wet places. This specifica-
tion is the disclosure of one form of my invention, while the claims define the
actual scope thereof.
Reference is to be had to the accompanying drawings forming part of this
specification wherein Figure 1 is a perspective view illustrating the cap and
shewing the parts detached and in section. Figure 2 is a perspective view of
the tool and also shewing the cap or detonator partly in section and in position
to be inserted between the jaws of the tool, for the purpose of crimping or seal-
ing the cap. Figure 3 is a view partly in section, shewing the jaws of the tool
with the cap held there between; and Figure 4 is a perspective view shewing
the cap in a finished state. Similar characters of reference indicate corres-
ponding parts in all the views.
The cap has a body or charge-receiving portion 5 the outer end of which is
closed and the inner end of which is formed with a pliable enlargement or
thimble 6 the outer end of which is open to receive the fuse 7 which, as will be
seen in Figure 2, is projected through the enlargement into the body or charge-
containing portion 5 so as to contact with the charge. Encircling the end of
the fuse and fitting snugly in the enlargement or thimble 6, is a rubber gasket 8
and when the charge has been inserted in the body 5 and the fuse 7 and gasket 8
placed in position, the thimble 6 should be slid or crimped so that the gasket 8 will
be firmly compressed around the fuse 7 and by crimping the thimble the thimble
is drawn firmly around the gasket and the displacement of the gasket and fuse
rendered impossible. By this construction the cap is held firmly on the fuse
and the connection between the cap and fuse rendered absolutely waterproof,
enabling the cap and fuse to be used in wet places without the liability of becom-
ing dampened.
The tool for crimping the thimble consists of two sections crossed and pivoted
on a pin 9, each section consisting of a handle portion 10 respectively integral
with jaws 11 and 12. These jaws are adapted to meet each other face to face,
as shewn in Figure 3. The jaw 11 is provided on its inner face with a semi-
circular concavity 14 flanked by studs 15 which project towards the jaw 12 and
which have their inner faces curved or bevelled outwardly. The jaw 12 has a
semi-circular concavity 16 on its inner face which matches with the concavity 14,
and this concavity 16 is flanked on each side by small openings 17 arranged to
respectively receive the studs 15. In crimping the cap, the thimble is laid in
either one of the cavities 14, 16, and the jaws forced together, which causes the

page_text: thimble to be compressed forming at each side thereof a welt-like projection 18.
Simultaneously with this action, the studs 15 entering the openings 17 respec-
tively engage these projections 18, and bend them over against the sides of the
thimble, as indicated at 19 in Figure 4.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The fuse cap having the body, with the thimble.
2. The fuse cap having the thimble receiving the fuse and communicating
with the body of the cap, and the gasket in the cap to encircle the fuse.
3. The fuse cap with the compressible thimble capable of being closed on
the fuse.
4. The tool for sealing fuse caps, the tool having jaws with interlocking studs
and openings arranged alongside the matching eavities.
Dal
101
1
1000
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.