Improvements in and relating to Miners' Safety Lamps.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Miners' Safety Lamps.
I, THOMAS THOMAS, of 12, Ynyshir Road, Ynyshir, near Pontypridd, Miner,
do hereby declare the nature of this invention to be as follows:-
My present invention has reference to certain improvements which I have
devised in connection with those previously patented by me relating to miners'
safety lamps, namely No. 8136 of 1889 and No. 15,626 of 1894. Now, my present
invention of improvements in and relating to miners' safety lamps, has for
objects.
Firstly: To so guide the wick flame as to prevent it from coming in contact
with the lamp glass :-
Secondly-To provide the lamp with a more suitable chamber than that referred
to lines 42 to 45 of the Complete Specification of my Invention No. 8136 of 1889
and shewn Figure 2 of the drawings accompanying same,-in order to effectually.
ensure the blocking or strangling of the current of the lamp in the event of an
explosion occurring within the lamp.
Thirdly-The object under the third head of my present invention is to further
safeguard against accidents arising from tampering with miners' safety lamps after
once being locked.
In carrying out the first referred to head of my present invention and with a
view to effect the object sought to be attained, I, form the base of the inner tube E,
shewn Figure 2 of the drawing accompanying the Complete Specification of my
Invention, No. 8136 of 1889, with a bell mouthed enlargement or surrounding
flange or lip and leaving but a very contracted space or clearance between the
circumferential edge of the said flange and the inside walls of the cylindrical lamp
glass. This space, I have found in practice, should not exceed one eighth of an
inch clearance. I am thus enabled to so guide the wick flame as to prevent its
coming in contact with the lamp glass.
In carrying out the second head of my present invention I increase the height
of the inner tube I. (Figure 2 of the drawings above referred to) and also lengthen
the depending sides or walls of the inner shield B (Figure 2 of the drawings
above referred to) so that under this head of my present improvements, a slight
overlapping occurs or results at the bottom of the inner shield B and the top of
the inner tube I above referred to. This alteration in the disposition and form of
the parts of the lamp above identified under the first and second heads of my
present improvements allows the lamp, with my present improvements possessing
a chamber (between the partition F and the flange or lip aforesaid with which the
bottom of the inner tube E is now formed or provided) better adapted and suited
than heretofore, to ensure the effectual blocking or strangling of the current of
the lamp in the event of an explosion occurring within it.
In carrying out the third head of my present invention with a view to further
safeguard against accidents arising from tampering with miners' safety lamps after
once being locked, I employ a lead rivet which is to be inserted in a slot in the
body of the ring C shewn more particularly in Figures 2 and 3 in the drawings
accompanying my Complete Specification of Invention No. 8136 of 1889 with one
eud coming through into the ring D. Said slot to be oval in cross section so as to
allow of the rivet being rivetted down in the lower end of the slot. Under this

page_text: third head of my present invention I also make use of the special device of nippers
with stamp inserted for stamping the rivet head with any predetermined private
mark.
Dated this 17th day of July 1896
V. LAZARUS,
1, Furnival Street, Holborn, E.C., Agent for Applicant.
Improvements in and relating to Miners' Safety Lamps.
I, THOMAS THOMAS, of 12, Ynyshir Road, Ynyshir, near Pontypridd, Miner,
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 the following
statement:-
My present invention has reference to certain improvements which I have
devised in connection with those previously patented by me relating to miners'
safety lamps, namely No. 8136 of 1889 and No. 15,626 of 1894. Now, my
present invention of improvements in and relating to miners' safety lamps has for
objects.
Firstly-To so guide the wick flame as to prevent it from coming in contact
with the lamp glass.
Secondly-To provide the lamp with a more suitable chamber than that referred
to lines 42 to 45 of the Complete Specification of my Invention No. 8136 of 1889.
and shewn Figure 2 of the drawings accompanying same-in order to effectually
ensure the blocking or strangling of the current of the lamp in the event of an
explosion occurring within the lamp.
Thirdly-The object under the third head of my present invention is to further
safeguard against accidents arising from tampering with miners' safety lamps after
once being locked.
In carrying out the first referred to head of my present invention and with a
view to effect the object sought to be attained, I form the base of the inner tube E,
shewn Figure 2 of the drawings accompanying the Complete Specification of my
Invention No. 8136 of 1889, with a bell mouthed enlargement or surrounding
flange or lip and leaving but a very contracted space or clearance between the
circumferential edge of the said flange and the inside walls of the cylindrical lamp
glass. This space, I have found in practice, should not exceed one eighth of an
inch clearance. I am thus enabled to so guide the wick flame as to prevent its
coming in contact with the lamp glass.
In carrying out the second head of my present invention I increase the height
of the inner tube I, (Figure 2 of the drawings above referred to) and also lengthen
the depending sides or walls of the inner shield B (Figure 2 of the drawings
above referred to) so that under this head of my present improvements, a slight
overlapping occurs or results at the bottom of the inner shield B and the top of
the inner tube I above referred to. This alteration in the disposition and form of
the parts of the lamp above identified under the first and second heads of my
present improvements allows the lamp, with my present improvements possessing
a chamber (between the partition F and the flange or lip aforesaid with which the
bottom of the inner tube E is now formed or provided) better adapted aud suited
than heretofore, to ensure the effectual blocking or strangling of the current of
the lamp in the event of an explosion occurring within it.
In carrying out the third head of my present invention with a view to further
safeguard against accidents arising from tampering with miners' safety lamps after

page_text: once being locked, I employ a lead rivet which is to be inserted in a slot in the
body of the ring C shewn more particularly in Figures 2 and 3 in the drawings
accompanying my Complete Specification of Invention No. 8136 of 1889 with one
end coming through into the ring D. Said slot to be oval in cross, section so as
to allow of the rivet being rivetted down in the lower end of the slot. Under
this third head of my present invention I also make use of the special device of
nippers with stamp inserted for stamping the rivet head with any pre-determined
private mark.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
First. The improvements in and relating to miners' safety lamps substantially
as herein described."
Second. In miners' safety lamps the means employed for preventing the wick
flame from coming in contact with the lamp glass substantially as herein
described.
Third. In miners' safety lamps the means employed for effectually ensuring the
blocking or strangling of the current of the lamps in the event of an explosion
occurring within same, substantially as herein set forth.
Fourth. In miners' safety lamps the employment as herein set forth of the lead
rivet lock for the detection of and with a view to the prevention of the lamp being
tampered with after being locked.
Dated this 30th day of April 1897.
V. LAZARUS,
1, Furnival Street, Holborn, London, E.C., Agent for Applicant.