Improvements in or connected with Miners' Safety Lamps.
Year: 1894

page_text: Date of Application; 17th Dec., 1894
Complete Specification Left, 12th Sept., 1895-Accepted, 12th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in or connected with Miners' Safety Lamps.
We, WILLIAM ACKROYD, of Birkenshaw,. Colliery Proprietor, and WILLIAM
BEST, of Wesley Street, Morley, Engineer, both near Leeds, in the County of
York, do hereby declare the nature of this invention to be as follows :-
The objects of our invention are to provide a suitable deflector outside the air
holes in the shield of a miner's safety lamp, together with means for correcting.
the locking device when the oil chamber of a lamp screws up untrue, by reason of
wear or other causes, as well as to improve the light of a miner's safety lamp on
the side where the light is most required, whilst the light is cut off from the other.
side. This latter proves of great service, not only for directing the bulk of the
light in the required direction; but in obviating the dazzling effect on people
following the bearer of a lamp in a gallery of a mine or other dark place when the
said lamp is being carried.
According to our invention we form a flange or projecting ring on the upper.
portion of the shield above the air holes, and. on this flange we cut a screw thread.
A ring is provided having a screw thread cut on the interior, which thread may
extend the full depth of the ring or on the upper portion only. The ring is of
larger diameter than the outside of the shield, and when screwed onto the flange
it covers the holes in the shield, leaving a space between them for the passage of
air from the holes. In this manner should a back draught occur it is caused to
travel in a broken line to the gauze, thus obviating a direct current passing .
through the holes to the gauze, and endangering an explosion, whilst at the same
time the free circulation of air to the lamp is not impeded.
The arrangement we employ for making the locking device permits of the
locking of the lamp when the screw thread thereon becomes worn and comprises a
ring which is mounted and free to turn on the body of the lamp, being preferably
screwed thereon. An eyelet or loop is hinged to this ring, and the usual projection
is provided on the lamp bottom. Should the lamp screw up untrue, the ring is
screwed or adjusted until the hinged loop is over the projection on the lamp
bottom, when the fastening is effected.
In some cases the adjusting ring may be fitted to the lamp bottom and the
stationary fastener is then connected to the lamp frame or to one of the pillars
on same.
On the outside of the glass a silver reflecting surface is applied preferably for
about a third or a quarter of the circumference of the said glass. The reflecting
surface is then painted or otherwise coated for the purpose of guarding it from
injury.
By constructing the glass as above described a second image of the flame is
thrown towards the object to be lighted, and thus double the ordinary light or
nearly so is concentrated where it is most required.
Dated this 17th day of December 1904
BREWER & SON,
London and Leeds, Agents for Applicants.

page_text: We, WILLIAM ACKROYD of Birkenshaw, Colliery Proprietor, and WILLIAM
BEST of Wesley Street, Morley, Engineer, both near Leeds, in the County of
York, 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 bhe
following statement :-
The objects of our invention are to provide a suitable deflector outside the air
boles in the shield of a miners safety lamp; and to provide ineans for correcting
the locking device when the oil chamber of a lamp screws up untrue, by reason of
wear or other causes; and also to improve the light of a miners safety lamp on the
side where the light is most required, whilst the light is cut off from the other side.
This latter proves of great service, not only for directing the bulk of the light in
the required direction, but in obviating the dazzling effect on people following the
bearer of a lamp in a gallery of a mine or other dark place when the said lamp is
being carried.
In order that our invention may be clearly understood, we will proceed to
describe same with reference to the accompanying drawings, in which similar
letters refer to like parts in all the figures.
Fig. 1 is a part sectional elevation, and Fig. 2 an elevation of the upper part of
a miners safety lamp, shewing one portion of our invention.
Fig. 3 is a part sectional side elevation, and Fig. 4 a front elevation of the lower
part of a miners safety lamp, shewing another portion of our invention.
According to our invention, and with reference to Figs. 1 and 2 of the accom-
panying drawings, we prolong or extend the plate A to a suitable distance beyond
the outside diameter of the shield B; and to this plate A we attach a ring or
deflector C, the said deflector being of sufficient depth vertically to cover the
holes B¹ in the shield B. A space is thus left between the ring or deflector C and
the shield B for the free passage of air from the holes B'; but should a back
draught occur, the deflector C causes the current to travel to the gauze D in a
broken line, thereby preventing a direct inrush of air through the holes B' to the
said gauze D. 1o this manner the free circulation of air in the lamp is not
impeded, whilst at the same time the risk of explosion is reduced to a minimum.
At Figs. 3 and 4 we have shown our arrangement of locking device, consisting
of a ring E, which is mounted and free to turn on the body F of the lamp, being
preferably screwed thereon as shown. An eyelet or loop E' is hinged to this
ring E, and the usual projection G is provided on the lamp bottom H. Should
the lamp bottom H screw up untrue, the ring E is turned or adjusted until the
hinged loop E is over the projection G on the lamp bottom H, when the fastening
is effected in the ordinary way.
When the ring E is attached to the lamp body F by means of a screw thread,
the said thread is formed in the opposite direction to that on the lamp
bottom H.
In some cases the adjusting ring E may be fitted to the lamp bottom H, and
the stationary projection G is then connected to the lamp body F or to one of
the pillars F on same.
In order to improve the light, we apply a silver reflecting surface on the
outside of the glass J, preferably for about a third or a quarter of the cir-
cumference of the said glass. The reflecting surface is then painted or otherwise
coated for the purpose of guarding it from injury.
By constructing the glass J as above described, a second image of the flame is

page_text: thrown towards the object to be lighted, and thus double the ordinary light or
nearly so is concentrated where it is most required.
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 :—
1. The ring or deflector C attached to the upper part of a miners safety lamp,
whereby the air holes are protected from a sudden inrush of air, substantially as
and for the purposes set forth.
2. The ring E which is free to turn on the frame of the lamp, substantially as
and for the purposes set forth.
3. The silver reflecting surface on the glass of the lamp, and protected by a
paint or other coating, substantially as and for the purposes set forth.
Dated this 12th day of September 1895.
BREWER & SON,
London and Leeds, Agents for Applicants.