Improvements in Cartridges to be Used for Blasting in Mines and other Places where Inflammable Gas or Air is Present.
Year: 1888

page_text: RES
Date of Application, 13th June, 1888
Complete Specification Left, 13th Mar., 1889
Complete Specification Accepted, 13th Apr. 1889
Improvements in Cartridges to be Used for Blasting in Mines and
other Places where Inflammable Gas or Air is Present.
I MILES SETTLE of Darcy Lever near Bolton in the County of Lancaster Colliery
Proprietor and Mining Engineer do hereby declare the nature of this invention to be
as follows:-
This invention relates to the construction of cartridges which on exploding will not
emit flame and which can consequently be used for blasting in mines and other places
where inflammable gas or air is present.
My invention consists of an air tight casing of suitable strength to resist considerable
pressure from within.
Inside this case, which is preferably of such a diameter as to fit into the blast hole,
I place a small detonator suitably covered with a watertight protector and I pass the
fuse or other connection or connections from this detonator through a stuffing box or
boxes in the outer case. I form a small back pressure valve in one end of the casing
which latter I fill with water or other suitable fluid and I also pump air or suitable gas
into the casing until there is a considerable pressure inside the same, but not quite
sufficient to burst it. I prefer to support the detonator in the casing by pins or
projections or by a flanged ring or similar means so that it can not touch the sides
of the casing, the fuse or other connection retaining it in position in about the centre
of the same.
The cartridge thus or equivalently fitted is ready for insertion into the blast hole
which is filled in with stemming as usual, and upon ignition of the detonator above
named an increase of pressure is generated sufficient to burst the casing and being thus
liberated to act upon and rend the coal or other substance required to be "broken
down."
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.

page_text: Improvements in Cartridges
LU DO
UBER TOT
Diastinɓ
כס
other Places where Inflammable Gas or Air is Present.
I MILES SETTLE of Darcy Lever near Bolton in the County of Lancaster Colliery
proprietor and Mining 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:-
This invention relates to the construction of cartridges which on exploding will
not emit flame, and which can consequently be used for blasting in mines and
other places where inflammable gas or air is present.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the annexed sheet of drawings, and the following explanation thereof.
Fig. 1. on the drawings is a longitudinal section of a cartridge made according
to my invention and Fig. 2 is a similar view of a slight modification thereof.
The invention consists principally of an air-and-liquid-tight containing vessel or
casing a preferably of iron or steel made in the shape of a cylinder with hemi-
spherical ends of a suitable diameter to fit into the blast hole and of such a strength
as to resist considerable pressure from within.
At one end it is provided with a gland b into which (see Fig. 1.) fits a metallic
plug c and a metallic cap d the latter being screwed to the lugs on the gland b
by means of bolts c.
An india rubber ring f is placed round the plug c and
an india rubber washer g is placed between the plug c and the cap d the whole
forming an efficient stuffing box, through which are passed the electric wires h
leading to the detonator i, the latter being introduced into the casing a and the
wires passed through the plug c and the cap d and the washer g before the cap
is screwed into the gland.
A back pressure valve may be fixed at any convenient part of the casing or a
charging tapk (Fig. 1).
The casing a is to be filled with compressed air or other suitable fluid under
pressure which is pumped in until there is a considerable pressure inside the same
but not sufficient to burst it.
The valve or tap being closed the cartridge is ready for insertion into the blast
hole which is filled in with stemming as usual, and upon ignition of the detonator i
an increase of pressure is generated sufficient to burst the casing a and being thus
liberated to act upon and rend the coal or other substance required to be "broken
down."
In the modification shown at Fig. 2 the cap d is hollow and is screwed into
the neck or gland b, a metal washer or diaphragm c being inserted between the
cap d and the india rubber plug 9.

page_text: In any case the containing vessel or casing a must be such that it can be
charged with compressed air or carbonic acid gas (or any other extinguishing
substance either liquid or gaseous) under pressure.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
The construction of cartridges for the purposes above referred to consisting of
a metallic or other suitable casing filled with either a liquid or gaseous fire
extinguishing substance under pressure and containing a detonator provided with
electric wires passing out through a stuffing box or its equivalent at one end of
the casing substantially as and for the purpose hereinbefore particularly set forth
and illustrated by the drawing annexed.