Year: 1888

page_text: I JOHN PEARSON of No. 8 Broom Avenue, Broom Lane, Levenshulme, Lancashire,
Engineer do hereby declare the nature of my invention to be as follows:-
These improvements refer to an invention for which Provisional Protection No. 1500
was granted to me on the first day of February 1888 and consist in closing the orifices
for ventilation of the lamp,-both the inlet and outlet passages-simultaneously with
the extinction of the flame of the lamp and whereby any ingnited gas floating about in
the interior of the lamp becomes instantly extinguished.
As applied to the inlet passages I provide an annular ring perforated with holes
which come opposite to corresponding perforations in the frame of the lamp and in this
position permit the passage of air therethrough to support combustion. And in order
to cause the said ring to turn upon its central axis a sufficient portion of a revolution
to bring a blank part of such ring opposite to the inlet passages and so to close the
same I connect such plate to an armi branching from the vertical rod of my improved
extinguishing apparatus and thus I ensure that as such arm turns in releasing the
extinguisher it shall also close the inlet ventilating orifices.
The outlet passages from the lamp may be similarly baffled by a plate held open
by the same fusible clip as the extinguisher and which plate springs upwards and
closes the outlet apertures simultaneously with the extinguishing of the flame.
Dated this 98th day of February 1888
JOHN G. WILSON,
Patent Office,
55, Market Street, Manchester,
Agent for the Applicant.

page_text: I, JOHN PEARSON of 8 Broom Avenue, Broom Lane, Levenshulme, Lancashire,
Engineer, 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 :--
These improvements refer to an invention for which Provisional Protection No. 1500
was granted to me on the 1st day of February 1888, and consists in the means
employed for closing the orifices for the ventilation of the lamp,-both the inlet and
outlet passages simultaneously with the extinction of the flame of the lamp, and
whereby any ignited gas floating about in the interior of the lamp becomes instantly
extinguished.
On the accompanying drawing, Fig. 1, is a front sectional view; and Fig. 2 a side
sectional view, illustrative of the same miners lamp as described in the Specification
of my former patent. but with my present improvements applied thereto; and shewing
the parts in position with the wick ignited and the ventilating orifices all open. Fig. 3.
is a similar side sectional view with the same parts in their relative positions, when the
light is extinguished and the ventilating orifices are all closed. Fig. 4. is a sectional
plan of Fig. 1. on line a-b. Fig. 5. is a sectional plan of Fig. 2. on line c. d ; and
Fig. 6. is a sectional plan of Fig 3 on line e-f. Fig. 7. is a front view, and Fig. 8. a
side view of my improved extinguisher and its actuating mechanisın; and Fig. 9. repre-
sents a front and side view of the fusible metal clip.
In all the views the same letters of reference are used to indicate similar parts.
In accordance with my present improvements I employ the usual air inlet passages
or perforations a in the bottom of the hood of the lamp and above these 1 provide a
circular or annular metallic plate b. with holes c formed therein and corresponding to
the air inlet passages a.
When immediately opposite each other as seen in Figs. 1. and 2. these perforations a.
and holes c. permit the entrance of air to support combustion inside the lamp. And in
order to cause the said ring to turn upon its central axis a sufficient portion of a revolu-
tion to bring a blank part of such ring opposite to the inlet passages a. and so as to
close the same simultaneously with the action of the extinguisher I connect the ring
or plate to one extremity of a spiral spring d secured to the fixed stud e. and thus
I give such plate a constant tendency to assume the closed position seen in Figs. 3.
and 6.
I also provide a baffle plate fcapable of sliding up and down for closing upon the
orifice g. formed between the interior of the hood h. and the outlet passages i as seen in
Fig. 3.
It now remains to describe how these inlet and outlet ventilating orifices are
closed simultaneously with the extinguishing of the flame. This is effected by
utilising the same rod j connected to the extinguisher k and carried up inside the
lamp and there held by a fusible metal clip 1. hung upon the pillar m as in my
former invention; but in this case I form a double crank n upon the length of the

page_text: said rod j, opposite to the annular plate b, in order that one arm of a rocking latch o
may be inserted between such cranks, whilst the other arm of the same latch rests
upon the upper face of the annular plate b. In this position of the parts and
as illustrated in Figs. 1. and 2. a stud p. rising from the plate b (under the
influence of the spiral spring d) presses against the same arm of the rocking latch
and thus holds the annular plate 6 in the open position so long as the fusible metal clip l.
remains intact.
to
b
At the same time by continuing the rod upwards to the baffle plate fI am enabled
open
such plate as hereinafter described.
The action of my improved safety lamp mechanism may be described as
follows:-
Immediately upon a rise of temperature inside the lamp the fusible metal clip
is caused to melt and so permits the extinguisher to close over the wick as described
in the Specification of my former invention, at the same instant and by the con-.
necting rod j descending to the position illustrated in Figs. 3 and 8. the baffle
plate has not only closed upon its orifice by reason of losing its support but the
upper part of the crank n by coming in contact with the rocking latch o has
caused the same to tilt over to the position seen in Fig. 3. The pin or stud p in turn
has thus lost its abutment and as a consequence, the annular ring 6 has turned upon
its axis a portion of a revolution until stopped by the pin r coming in contact with
the studs, and thus by bringing the blank part of the ring & opposite the inlet passages a,
the same have become closed.
In this manner I secure not only the extinguishing of the light but by
simultaneously closing the air inlet and outlet passages, I ensure that any
ignited gas floating about in the interior of the lamp becomes instantly ex-
tinguished.
It will be apparent that the outlet orifices from the lamp may be similarly baffled by
a plate held open by the same fusible clip as the extinguisher and which plate springs
upwards and closes the outlet orifices simultaneously with the extinguishing of the
flame.
It will also be obvious that in some cases and where it is not considered necessary
to provide the double security of extinguishing the light of the lamp and stopping the
air supply that a spiral or other suitable spring may be applied to give constant tension
to the rod j and thus the extinguisher might be dispensed with.
Having thus 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 :-
'
1st. The improved combination and arrangement of mechanism for closing the air
inlet and outlet orifices simultaneously with the extinguishing of the wick of
the lamp substantially as hereinbefore described and illustrated on the accompanying
drawing.
2nd. In a miners safety lamp the employment of a perforated annular ring for closing
the air inlet passages in combination with a cranked rod and rocking latch all mounted
and operated substantially as herein before described.
3rd. For holding the annular perforated ring and baffle plate in the open positions
the employment of a fusible metal clip supported and acting substantially as herein-
before described.
1000
JOHN G. WILSON,
55, Market Street, Manchester,
. Agent for the Applicant.