Improvements in Screwed Firebox Stays of Boilers.
Year: 1897

page_text: TIVOVIDIONAL DILOLIVA
Improvements in Screwed Firebox Stays of Boilers.
EDGAR WORTHINGTON, Mechanical Engineer, Mill Bank, Bowdon, Cheshire,
do hereby declare the nature of this invention to be as follows:-
My invention relates to screwed boiler-stays, made of copper, iron or other
suitable material, situated within the water-space of steam boilers of the locomotive
type, and connecting directly the inside firebox with the boiler shell.
And it has for its object an increase in each stay of its cooling surface in the
proximity of the fire-box end of the stay, so that by bringing the water within
the boiler into more intimate contact with the body of the heated stay the tendency
to lower the temperature of the stay to that of the water in the boiler is increased,
and thus any tendency to burn away the stay heads, which project through the fire-
box plate into the fire, is diminished, and a common source of trouble in the
locomotive type of boiler, namely the removal of stays, which are otherwise in
good condition, is avoided.
A further incidental advantage of my invention is that the fire-box plates in
the immediate neighbourhood of these cooled stay heads are also partially protected
from the severe direct heat of the fire by the cooling influence of these stays.
My invention consists in perforating each stay with three or more holes about
one quarter of an inch diameter, communicating with the water in the boiler
and spaced equidistant round the circumference of the stay. These holes enter
the stay from the water space, either in a zig-zag direction or diagonally direct
towards the centre of the axis of that portion of the stay which is screwed or
rivetted or otherwise embedded within the fire-box plate. At or before reaching
this central point the three or more holes meet and form together a passage for
water and steam to circulate through the stay.
Whatever the position the stay may assume when finally screwed into the plates
the water enters it by one of the lower perforations &, rising through the body
of the stay, escapes through another perforation. The stay where perforated
may be sufficiently enlarged to maintain its necessary strength and sectional area.
Dated this 13th day of December 1897.
EDGAR WORTHINgton, Mill Bank, Bowdon, Cheshire, Mechanical Engineer,
do hereby declare the nature of this invention and in what manner the same is
[Price 8d.]

page_text: to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention relates to screwed boiler stays made of iron copper or other
suitable metal and situated within the waterspace of steam boilers of the
locomotive or marine type and connecting directly the inside firebox with the
boiler shell.
One stay is shown full size in Fig. 1. The stay S connecting the firebox C
to the boiler shell I through the waterspace W terminates in the fire F where the
great heat tends to waste away the stay head D until its hold in the firebox C is
so reduced as to cause accident unless the stay be renewed.
My invention consists in perforating the stay S with three or more holes HHH
communicating with the water W and spaced equidistant round the circum-
ference of the stay penetrating in a zig-zag or preferably a diagonal direction,
as shown in Figs. 2 and 3, direct towards the centre of that portion of the stay S
which is screwed rivetted or otherwise embedded within the firebox plate C. These
holes meet at or before reaching the axis of the stay and form together a
passage HHH Figs. 2 and 3 for water and steam to circulate upwards through
the body of the stay and to cool the heated end D and prevent its wasting away.
The stay S where perforated is sufficiently enlarged in diameter to maintain its
necessary strength and sectional area.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
CLAIM.
The perforation of a boiler fire-box stay, by three or more holes near the end
exposed to the fire radiating obliquely from the axis of the stay into the water-
space around the heated end in the manner above described, for the purpose of
allowing water to circulate through the stay near the head and prevent its corrosion
by the fire.
Dated this 19th day of Santomhion 1800