A Safety Fuze Lighter.
Year: 1891

page_text: Date of Application, 22nd July, 1891
Complete Specification Left, 15th Mar., 1892-Accepted, 16th Apr., 1892
PROVISIONAL SPECIFICATION.
A Safety Fuze Lighter.
We, JOHN HEATH, Colliery Manager, of Sneyd Colliery, Burslem, Stafford-
shire, and WILLIAM FROST, Colliery Under Manager, also of Sneyd Colliery,
Burslem, Staffordshire, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to a simple and portable implement whereby a fuze for
firing a blast in a mine can be kindled with safety even in an explosive atmosphere.
For this purpose we make a tube or barrel to fit the fuze which is inserted into
one end of the tube; at the other end is a nipple on which a percussion cap or
other suitable detonator is placed immediately before firing.
Under the barrel is a chamber communicating with the barrel by a small hole,
and from this chamber there is an outlet screened by fine wire gauze. At the
lower part of the chamber is pivotted a spring hammer the head of which is
hollowed out in front so that when, on being let go, it strikes the percussion cap
or detonator, it quite closes over it preventing any spark or flame from issuing by
the nipple. The fuze is ignited by the discharge of the cap and the hot expanded
gases, instead of exerting such pressure in the barrel as might force out the fuze,
find their way into the chamber below and issue through the gauze screen without
any risk of effecting ignition externally.
Dated this 22nd day of July 1891.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
A Safety Fuze Lighter.
We JOHN HEATH, Colliery Manager of Sneyd Colliery, Burslem, Stafford-
shire and WILLIAM FROST, Colliery Under Manager, also of Sneyd Colliery,
Burslem, Staffordshire do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Our invention relates to a simple and portable implement whereby a fuse for
firing a blast in a mine can be kindled with safety even in an explosive atmo-
sphere. For this purpose as shewn in the accompanying drawings, Fig. 1 being a
longitudinal section and Fig. 2 a front view, we make a tube or barrel a to fit the
fuse which is inserted into the open end of the tube; at the other end is a nipple />
on which a percussion cap or other suitable detonator is placed immediately before
firing. Under the barrel a is a chamber k communicating with the barrel by a
small hole and from this chamber there is an outlet screened by fine wire gauze e.
In a casing funder the chamber & is pivotted at c a hammer which can be drawn
back in opposition to a spring d. Its head s is hollowed out in front so that when,
on being let go, it strikes the percussion cap or detonator, it quite closes over it,
preventing any spark or flame from issuing about the nipple. The fuse is ignited
by the discharge of the cap and the hot expanded gases, instead of exerting such
pressure in the barrel as might force out the fuse, find their way into the chamber k
and issue through the gauze screen e without any risk of effecting ignition
externally.
Although we have shewn in the drawings a single barrel and its hammer,
Prins 8.77

page_text: there may be several of these arranged on one casing with the chamber k common
to them.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
-claim is :
A fuse lighter the barrel of which communicates with a chamber having an
outlet screened by fine wire gauze, and the hammer of which is hollowed to enclose
the nipple and detonator substantially as and for the purpose set forth.
Dated this 15th dor of March 1802
ABEL & IMRAY,
Agents for the Applicants.