Improvements in or relating to Miners' Safety Lamps.
Year: 1891

page_text: Date of Application, 19th Jan., 1891
Complete Specification Left, 15th Oct., 1891-Accepted, 21st Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Miners' Safety Lamps.
I, WILLIAM HEYS of Ledbether Fold, Little Lever near Bolton in the County
of Lancaster, Colliery Fireman, do hereby declare the nature of my said invention
to be as follows:-
This invention refers to improvements in or relating to miners' safety lamps and
consists in providing means which allow of the light being directed onto the roofs
of mines without obstruction; for detecting the presence of gas within half-an-inch
of the roof, and also for reducing the parts of the lamp for cleaning purposes,
thereby increasing the efficiency of the lamp over others at present in use.
This
effect by constructing the body or casing of the lamp without a middle shoulder or
projection, and provide the upper end of the coned glass with a conical shield or
chimney: the upper end of the latter being fitted with a dished top to receive a
perforated copper sheet or cap in lieu of the ordinary gauze shield. On the dished
top is mounted a cap provided with slots or openings on the rim of same to allow of
their being placed against the roofs of mines to detect the least amount of gas, an
advantage not found in other lamps. The inlets for air are placed as near the top
of the lamp as possible. The bottom of the lamp is provided with means of
adjustment to compensate for varying lengths of glass, and for making a tight-joint.
The foundation plate or screw for carrying the conical glass is provided with holes
or slots over which is placed a perforated copper sheet.
Dated the 17th January 1891.
EDMUND CHADWICK,
Agent.
COMPLETE SPECIFICATION.
Improvements in or relating to Miners' Safety Lamps.
I, WILLIAM HEYS of Ledbether Fold, Little Lever near Bolton in the County
of Lancaster, Colliery Fireman, do hereby declare the nature of my said 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 refers to improvements in or relating to miners' safety lamps and
consists in providing means which allow of the light being directed onto the roofs
of mines without obstruction; for detecting the presence of gas within half-an-inch
of the roof, and also for reducing the parts of the lamp for cleaning purposes,
thereby increasing the efficiency of the lamp over others at present in use. This I
effect by constructing the body or casing of the lamp without a middle shoulder or
projection, and provide the upper end of the coned glass with a conical shield or
chimney; the upper end of the latter being fitted with a dished top to receive a
perforated copper sheet or cap in lieu of the ordinary gauze shield. On the dished:
top is mounted a cap provided with slots or openings on the rim of same to allow of.
their being placed against the roofs of mines to detect the least amount of gas, an
advantage not found in other lamps. The inlets for air are placed as near the top
of the lamp as possible. The bottom of the lamp is provided with means of
adjustment to compensate for varying lengths of glass, and for making a tight-joint.
The foundation plate or screw for carrying the conical glass is provided with holes
or slots over which is placed a perforated copper sheet.

page_text: Fig. 1 is a sectional elevation of a miners' safety lamp, known as "Gray's" lamp,
with my improvements applied:..
Fig 2 is an outside elevation of same..
Fig. 3 is a sectional' plan through line A¹ B" in Fig. 1.
Fig. 4 is an elevation partly in section of perforated sheet or sieve ring.
Fig. 5 is a plan of lamp top, and
Fig. 6 is a sectional plan through line C¹ D' in Fig. 1.
A is the top or cap; B the perforated copper sheet or gauze; C the conical
shield or chimney; D the coned glass; E the screw for holding coned glass D in
position F the frame of the lamp; G the oil well or reservoir; H the air inlet
tubes, and I the perforated copper sheet or sieve ring. The outside of the oil. well
or reservoir G is provided with the screw J on which is mounted the lamp frame F.
In the latter are fixed the air inlet tubes H with the air passages K at a point
about midway or otherwise of their length, through which air passes-as indicated
by the arrows-to support combustion. The upper ends of the air tubes H are
secured to the disc L mounted on the upper end of the conical shield or chimney C.
The latter is secured in position to the disc L by the screwed top or cap A
provided with the air holes or slots M in the disc P. The underside of the latter
is made with the annular recess S to ensure of the passage of air. to or from the air
tubes H. The underside of the disc L is provided with the holes R to allow of up
and down currents under all conditions. In case of up currents the air passes
through the holes R into the annular recess S and down the air tubes H.. In case.
of down currents the air passes through the holes M. into the air tubes H. The
top or cap A is provided with the openings N to form a passage from the upper
end of the conical shield or chimney C, through which the products of combustion
pass and escape from the lamp. The conical shield or chimney C is fitted with the
perforated copper sheet or gauze B. The openings N in the top or cap. A are
constructed and placed so near the top that the lamp can be placed nearer the
roofs of mines than others at present in use, by which gas can be detected when
the least possible amount is present. The coned glass D is held in position between
the conical shield or chimney C and the lamp frame F by the screw E. The
screwed ring E is mounted in the lamp frame and provides means of adjustment
to compensate for varying lengths of glasses. The lower end of the screwed ring E
is provided with the air holes O in the rectangular groove, over which is placed
the perforated copper sheet I, and through which air is admitted to the combustion
chamber of the lamp. An important feature of this invention .consists in providing
a miners' safety lamp without. a middle shoulder or projection on the air inlet
tubes H and over the top of the glass D, thereby providing means. which allow of
the light. from the lamp being directed to the roofs of mines or other places without
obstruction.
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 I
claim' is :-
:-
1.. Constructing, miners' safety lamps without a middle shoulder or projection
between the frame F of the lamp and the upper disc L, substantially as described
and for the purpose specified.
2. In a miners' safety lamp the use of the conical shield or chimney C provided
with the perforated copper plate or gauze B, substantially as described.
3. In a miners' safety lamp the use of the slotted screwed top A for the purpose
specified..
4.In combination with the disc P of the top A and the disc L the use of the
annular recess S and the holes R for the purpose specified, substantially as
described.

page_text: 5. The general arrangement, construction, and combination of parts composing
the improved miners' safety lamp, substantially as described and as illustrated in
the annexed drawings.
1001
EDMUND CHADWICK,
Agent.