Improvements in Gauzes for Miners' Safety Lamps.
Year: 1891

page_text: Date of Application, 31st July, 1891
Complete Specification Left, 3rd Dec., 1891-Accepted, 9th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Gauzes for Miners' Safety Lamps.
I, WILLIAM HENRY JOHNSON, of the firm of Richard Johnson Clapham
and Morris, of 24 and 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 relates to the cylindrical or conical gauzes employed in miners'
safety lamps and my object is to secure the gauze top to the circular portion of the
cylinder in a stronger and more reliable manner than now customary and to
strengthen the upper part of the gauze.
The gauze cylinders of miners' safety lamps are generally fitted with a brass
copper or other sheet metal ring at the mouth or lower end to strengthen them,
while the top piece of gauze is generally secured to the cylindrical portion by
folding the edges of one portion upon the other and beating the joint to unite the
parts thoroughly. In some safety lamps a cylindrical gauze cap is employed to
cover the upper portion of the main gauze, these caps generally have their tops
fitted on by flanging outwardly the cylindrical portion, and then bending the outer
edge of the top and turning it in to cover such flange, the whole being beaten or
squeezed together to strengthen the joint the flange thus formed resting upon a ring
provided for the purpose in the lamp.
In place of the folded joint first described I propose to turn in the upper end of
the cylindrical portion to form a recess or space into which a turned up flange on
the gauze top is placed; when the two parts are in their proper position the doubled
portion is squeezed or beaten together on to the flange of the top after which a
brass or other metal ring is fitted over the doubled parts and secured in position
thereon by pressure by spinning over or otherwise to complete the joint. If
preferred the top piece could be doubled back to form the recess into which the
end of the cylindrical portion of the gauze enters and the joint made and finished
with a metallic ring as described.
When the gauze is fitted with a top which projects beyond the body of the gauze
the joint can be materially strengthened by the addition of a brass or other metal
ring fitted and pressed over the folded portion of the top.
Dated this 30th day of July 1891.
H. B. BARLOW,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Gauzes for Miners' Safety Lamps.
I, WILLIAM HENRY JOHNSON, of the firm of Richard Johnson Clapham and
Morris Limited, of 24 and 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 relates to the cylindrical or conical gauzes employed in miners'
safety lamps and my object is to secure the gauze top to the circular portion of the
cylinder in a stronger and more reliable manner than now customary and to
strengthen the upper part of the gauze,

page_text: The gauze cylinders of miners' safety lamps are generally fitted with a brass
copper or other sheet metal ring at the mouth or lower end to strengthen them,
while the top piece of gauze is generally secured to the cylindrical portion by
folding the edges of one portion upon the other and beating the joint to unite the
parts thoroughly. In some safety lamps a cylindrical gauze cap is employed to
cover the upper portion of the main gauze, these caps generally have their tops
fitted on by flanging outwardly the cylindrical portion, and then bending the outer
edge of the top and turning it in to cover such flange, the whole being beaten or
squeezed together to strengthen the joint the flange thus formed resting upon a
ring provided for the purpose in the lamp.
In place of the folded joint first described I propose to turn in the upper end of
the cylindrical portion to form a recess or space into which a turned up flange on
the gauze top is placed; when the two parts are in their proper position the doubled
portion is squeezed or beaten together on to the flange of the top after which a brass
or other metal ring is fitted over the doubled parts and secured in position thereon
by pressure by spinning over or otherwise to complete the joint. If preferred the
top piece could be doubled back to form the recess into which the end of the
cylindrical portion of the gauze enters and the joint made and finished with a
metallic ring as described.
When the gauze is fitted with a top which projects beyond the body of the gauze
the joint can be materially strengthened by the addition of a brass or other metal
ring fitted and pressed over the folded portion of the top.
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 an elevation Fig. 2 a plan and Fig. 3 a sectional elevation of a
miners' safety lamp gauze to which my improvements have been applied.
In these views a designates the conical or cylindrical lamp gauze, b the top
piece the edge of which is turned over the portion a as shown in the sectional view
Fig. 3, and the two parts a and then squeezed or beaten together.
The joint is now finished according to my present invention by means of a
metallic ring c which is shown detached in Figs. 4 and 5. The ring is fitted over
the doubled parts of the gauzes a and b and secured thereon by pressure or by
spinning over the outer edge or in any other convenient manner so as to bind the
parts firmly together.
A lamp gauze made and finished in this manner with the metallic ring c at the
top in addition to the ordinary metal ring d at the bottom is materially stronger
and more durable than a gauze finished in the usual way.
Figs. 6 and 7 illustrate an alternative mode of connecting the top gauze b to the
main gauze a. In this case the top gauze b is cut out square or thereabouts as
shown in Fig. 6 and the corners then bent over t. top edges of the main gauze a,
the joint being subsequently finished by the addi.. n of a metal ring c as previously
described.
Fig. 8 shows another alternative mode in which the top edge of the gauze a is
flanged or turned outward at a right angle to the main body of the gauze and the
top gauze is then laid upon and its edge doubled back over the flanged portion
of the gauze, the two parts being united and the joint completed by the addition of
a metallic ring c as before described.
Having now 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 :-
•
1. In a miners' safety lamp gauze the combination with the joint which unites
the top piece to the main gauze, of a metallic ring applied substantially as and for
the purposes herein set forth.

page_text: 2. The several combinations with a lamp gauze, of the top ring e substantially as
herein shown and described for the purposes specified.
Dated this 2nd day of December 1891.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.