Year: 1888

page_text: Date of Application, 1st Feb., 1888
Complete Specification Left, 1st Dec.. 1888
Complete 'pecification Accepted, 8th Jan., 1889
I JOHN PEARSON of 8 Broom Avenue Broom Lane, Levenshulme near Manchester
Mechanic do hereby declare the nature of my said invention to be as follows:—
The object of this invention is to construct a miners safety lamp which will
instantly extinguish itself in case of the temperature of the upper part of the lamp
so increasing say by the presence of fire-damp as to endanger or threaten an
explosion and consists in the employment of an extinguisher mounted upon a spindle
by preference alongside the wick as to be capable of turning over the wick and of
extinguishing the flame. By means of a spiral or other spring this extinguisher
has a constant iendency imparted to it to turn over the wick and is drawn back or
caused to make half a revolution upon its axis by a crank formed at the end of
the spindle being connected to one extremity of a rod the other extremity of which
rod is carried up to the upper part of the interior of the lamp and there secured
to a bracket by means of a fusible metal clip.
In this position of the parts the wick is exposed and the lamp capable of being
lighted.
It will now be apparent that by employing a fusible metal clip capable of melting
at a few degrees above the normal temperature of the lamp that a means is afforded of
releasing the extinguisher before the temperature has risen to a dangerous limit.
In some cases instead of the extinguisher 1 mount a serrated disk or toothed
wheel upon the aforesaid spindle the teeth of which engage with the wick of the
lamp and draw the same down into the socket and thus extinguish the flame in
case of the temperature rising as aforesaid.
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, in the County
of Lancaster, 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:-
The object of this invention is to construct a miners safety lamp which will instantly
extinguish itself in case of the temperature of the upper part of the lamp so increasing
say by presence of fire damp so as to endanger or threaten an explosion and consists
in the employment of an extinguisher mounted upon a spindle or axis by preference
alongside the wick as to be capable of turning over the wick and of extinguishing the
flame. By means of a spiral or other spring this extinguisher has a constant tendency
imparted to it to turn over the wick and is drawn back or caused to make half a
revolution upon its axis by a crank formed at the end of the spindle being connected,
to one extremity of a rod the other extremity of which rod is carried up the upper
part of the interior of the lamp and there secured to a pillar or bracket by means of a
fusible metal-clip.
In this position of the parts the wick is exposed and the lamp capable of being
lighted.
It will now be apparent that by employing a fusible metal clip capable of melting
at a few degrees above the normal temperature of the lamp that a means is afforded of
releasing the extinguisher before the temperature has risen to a dangerous limit. In
some cases instead of the extinguisher I mount a serrated disc or toothed wheel upon
the aforesaid spindle the teeth of the wheel engage with the wick and draw the same
down into the socket and thus extinguish the flame in case of the temperature rising
as aforesaid.
And in order that this my said invention may be the more readily understood
and carried into practical effect I have hereunto annexed a drawing of a Miners
Lamp embracing my improvements and will now proceed to describe the same
with the assistance of the various Figures and letters of reference marked thereon, the
same letters being used to denote similar parts in all the views.
Is
Fig. 1. is a front sectional view and Figs. 2 and 3 are side sectional views of my
improved Miners Lamp; Fig. 4 is a sectional plan of Fig. 1. on line a-. Fig.
a side and Fig. 6. a front exterior view of the improved automatic extinguishing
apparatus shewn separately and Fig. 7 represents a front and side view of the fusible
metal clip or link.
In all the views a is the base of the lamp supporting the glass b, wire gauze conc c
and hood d. Into the bottom of the base a screws the oil reservoir e for supplying
the lamp wick all such parts. being well understood-being of the usual and
ordinary construction. g. is an annular base plate (see Fig. 4, and 6) from one side
of which rises a bracket gl and from the other a
pillar h. Between these two latter is
mounted my improved extinguisher consisting of a cast or sheet metal cap i capable of
turning over the wick fand so extinguishing the light.-1 apply a spiral spring k

page_text: around one of the axes of the extinguisher to give it a constant tendency to close
upon the wick. On the other end of the extinguisher I provide an arm I forming a
crank to which is connected the lower end of a rod m carried up alongside the pillar
and through the guiding eye m² and terminating at the upper part of the interior of
the lamp. It will be obvious that the top extremity of the pillar and of the rod m
are bent or cranked at right angles o and p this is to enable the two extremities to be
braced together by the fusible nietal clip or link n seen separately in Fig. 7. and con-
sisting of any fusible metal capable of melting at a temperature a few degrees
higher than the ordinary temperature of the interior of the lamp.-The tension
of the coiled spring upon the rod m serves to constantly pull down the said rod
and thus the fusible clip or link is securely held between two divergent extremities o
and p. The annular base plate g is of such a diameter and thickness that it can he
clamped securely within the base of the lamp by the screwing up of the oil
reservoir e and in this position the extinguisher axis runs parallel with the side of
the lamp wick.
The action of my improved Miners Lamp may be described as follows:-To light the
lamp it is necessary to unscrew the oil reservoir e when the extinguishing apparatus
and oil reservoir may be removed together, the parts being in the relative positions
illustrated in Figs. 3, 5 and 6-vi. with the extinguisher closed over the wick. By
now raising the connecting rod m until its top extremity is on a level with the top of
the pillar a fusible metal clip n. is then passed over the two extremities o and p-the
extinguisher has thus made à partial revolution upon its axis and discloses the wick.
The parts being now re-placed in the lamp will assume the relative positions seen in
Figs. 1. 2 and 4 which shew the wick lighted and the extinguisher í ready for
action.
If the temperature of the interior of the lamp should now rise to the fusing point
Owing to the presence of fire damp-the fusible metal clip n. becomes disrupted so
releasing the rod m and permitting the extinguisher to turn upon its axis under
the influence of the spiral spring and thus the flame is instantly and effectually
extinguished.
Instead of employing an extinguishing hood i as hereinbefore described it will be
apparent that a serrated wheel or disc could he similarly employed upon the existing
spindle for turning down the wick.
Although only hereinbefore described and illustrated as applied to one description
of Miners Lamp it will be obvious that my improvements are equally applicable to all
other classes of lamps-the form of the extinguisher and the supporting mechanism
being modified accordingly.
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. In a miners lamp the employment of the improved automatic extinguishing
apparatus mounted and operating substantially as and for the purposes hereinbefore
herein before described.
2nd. The combination of the improved extinguisher connecting rod and supporting
pillar or bracket with a fusible metal clip or link substantially as and for the purposes
hereinbefore described.
JOHN G. WILSON,
55, Market Street, Manchester,
Agent for the Applicant.