Improvements in the Manufacture of Certain Miners' Safety Lamps.
Year: 1892

page_text: Date of Application, 30th Sept., 1892
Complete Specification Left, 24th May, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Certain Miners' Safety Lamps.
I, WILLIAM HENRY JOHNSON, of the firm of Richard Johnson Clapham and
Morris Limited, of 26 Lever Street, Manchester, in the County of Lancaster,
Wire Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention consists in improvements in the manufacture of those miners' safety
lamps which are commonly called "Protector" lamps, and the chief object of my
improvements is to lessen the cost of manufacture and simplify the parts of such
lamps.
My first improvement relates to the Protector locking devices and consists in
casting the two lock bosses upon the bottom of the lamp frame and then finishing
the bosses in situ, instead of soldering or otherwise fixing separate bosses previously
formed and finished to the bottom of the lamp as hitherto.
My second improvement consists in dispensing with the upper part of the
Protector lock, which part now consists of a spring bolt with a forked or curved
end entering a groove in the extinguisher which screws into the following up plate
or ring. This spring bolt, which is pushed into the lamp through the upper of the
two bosses mentioned under the first head of my improvements, cannot be withdrawn
until the oil reservoir has been unscrewed and removed. I dispense with this spring
bolt as above stated and the upper boss, and substitute a spring catch fixed upon
the following up plate, which catch permits the extinguisher to be screwed up into
its place but engages a projection on the extinguisher and thereby prevents it from
being unscrewed until after the oil reservoir has been unscrewed and the spring
catch released by a key or by the finger.
It will be obvious that in applying my first improvement to a lamp fitted or to
be fitted with my second improvement I cast only one boss upon the bottom of the
lamp frame instead of two as in the ordinary type of Protector lamp.
Dated this 29th day of September 1892
H. B. BARLOW & GILLETT,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Certain Miners' Safety Lamps.
I, WILLIAM HENRY JOHNSON, of the firm of Richard Johnson Clapham and
Morris Limited, of 26 Lever Street, Manchester, in the County of Lancaster,
Wire Manufacturer, 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 invention consists in improvements in the manufacture of those miners' safety
lamps which are commonly called "Protector Lamps," and the chief object of my
improvements is to lessen the cost of manufacture and simplify the parts of such
lamps.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying sheet of drawings reference being had to
the figures and letters marked thereon.
Figure 1 is a sectional elevation and Fig. 2 a plan of the bottom part of a
Protector lamp showing the ordinary Protector lock to which my first improvement
1

page_text: Fig. 3 is a sectional elevation and Fig. 4 a plan of the lower part of a lamp made
according to my second improvement and Figs. 5, 6, 7 and 8 are detail views of
parts of the same.
According to my first improvement illustrated by Figs. 1 and 2, I cast the two
lock bosses a, b upon the bottom of the lamp frame c and then finish the bosses
in situ, instead of soldering or otherwise fixing separate bosses previously formed
and finished to the bottom of the lamp as hitherto.
My second improvement consists in dispensing with the upper part of the
Protector lock, which part now consists, see Figs. 1 and 2, of a spring bolt d with a
forked or curved end entering a groove in the extinguisher e which screws into
the following up plate or ring f. This spring bolt d, which is pushed into the lamp
through the upper of the two bosses a, b mentioned under the first head of my
improvements, cannot be withdrawn until the oil reservoir g has been unscrewed
and removed. I dispense with this spring bolt d as above stated and the upper
boss and as illustrated by the drawings, Figs. 3 to 8, substitute a spring catch h
fixed upon the following up plate f, which catch h permits the extinguisher e to be
screwed up into its place but engages a projection e' on the extinguisher e and thereby
prevents it from being unscrewed until after the oil reservoir g has been unscrewed,
and the spring catch released by a key or by the finger.
It will be obvious that in applying my first improvement to a lamp fitted or to be
fitted with my second improvement, cast only one boss upon the bottom of the
lamp frame instead of two as in the ordinary type of Protector lamp.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is :-
-:
In miners' safety lamps having Protector locks-
1. Casting the two lock bosses upon the lamp frame instead of affixing thereto
separate bosses previously formed and finished substantially as herein set forth.
2. Dispensing with the upper lcck boss and spring bolt and substituting a spring
catch fixed upon the following up plate or ring and arranged to engage a projection
on the extinguisher substantially in the manner and for the purposes herein set
forth.
3. The general arrangement and combination of parts substantially as herein
described with reference to Figs. 3 to 8.
Dated this 23rd day of May 1893.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicant.