Improvements in Locomotive and other Steam Boilers.
Year: 1894

page_text: Date of Application, 13th July, 1894
Complete Specification Left, 8th Apr., 1895-Accepted, 11th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Locomotive and other Steam Boilers.
I, FRANCIS WILLIAM WEBB of Chester Place, Crewe, in the County of
Chester, Mechanical Engineer do hereby declare the nature of this invention to
be as follows:-
My invention relates to an improvement in the tube plates of locomotive &
other steam boilers, & also to the method of fixing the ends of the tubes in the
same, my object being to equalise the section of the metal in the tube plate
between the tubes & enlarge the area of the plate in contact with the water; also
to fix the tubes in such a manner as to protect the ends on the outside of the plate
from being burnt away by the flame from the fire. The first part of my invention
consists in drilling a number of small holes in the tube plate, on the water side,
part way through its thickness & of any convenient size, either circular or
triangular in shape & in such positions as to equalise the section of the metal
between the tubes & at the same time keep the tube plate cooler. The second
part of my invention consists in forming recesses in the tube plate, concentric with
the tubes & of a depth equal, by preference, to about the thickness of the tube, &
instead of beading the end of the tube over on to the outside of the plate, as is
the commonly adopted method, I turn it back into the recess, so that the end of
the tube is protected from the flame & not so liable to be burnt away as is
frequently the case when they are beaded over on the outside of the plate. The
accompanying drawing further explains the principle of my invention, but it
must not be taken as representing the actual details in carrying it out.
Fig. 1 is the elevation of a portion of a boiler tube plate, looking at it from the
water side.
Fig. 2 is a section of the same, showing the small holes already referred to &
also the method of fixing the tubes.
A, A, is the tube plate.
B, B, B, are the tubes.
c, c, the recesses in the tube plate.
d the ferrule, (when one is used).
e, e, e, the small holes drilled in the tube plate.
Improvements in Locomotive and other Steam Boilers.
I FRANCIS WILLIAM WEBB of Chester Place, Crewe, in the County of
Chester, Mechanical Engineer 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 an improvement in the tube plates of locomotive & other
steam boilers & also to the method of fixing the ends of the tubes in the same, my
object being to equalise the section of the metal in the tube plate between the
Price 8

page_text: tubes & enlarge the area of the plate in contact with the water; & also to fix
the tubes in such a manner as to protect the ends on the outside of the plate
from being burnt away by the flame from the fire. The first part of my invention
consists in drilling a number of small holes in the tube plate, on the water side,
part way through its thickness & of any convenient size, either circular or
triangular in shape & in such positions as to equalise the section of the metal
between the tubes & at the same time keep the tube plate cooler. The second
part of my invention consists in forming recesses in the tube plate, concentric with
the tubes & of a depth equal, by preference, to about the thickness of the tube,
& instead of beading the end of the tube over on the outside of the plate, as is
the commonly adopted method, I turn it back into the recess, so that the end of
the tube is protected from the flame & not so liable to be burnt away as is
frequently the case when they are beaded over on the outside of the plate. In
order that my said invention may be better understood I would refer to the
drawing left with the Provisional Specification. Fig. 1 is the elevation of a
portion of a boiler tube plate seen from the water side. Fig. 2 is a section of the
same. A A is the tube plate: B B B are the tubes: c c recesses in the tube
plate da ferrule (when one is used): e e e small holes drilled in the tube plåte.
In carrying out the first part of my invention, the object of which is to equalise
the metal in the tube plate between the tubes & also to bring as large a surface
of the tube plate as possible in contact with the water in the boiler & so keep it
cooler than at present, I drill a number of small holes e e e part way through the
tube plate A A of any convenient size or shape, in the drawing shown round &
triangular, although I do not confine myself to those particular shapes. The
second part of my invention consists in forming recesses c c in the tube plate A A
to receive the ends of the tubes B B, my object being to protect the ends from the
flame of the fire & so prevent them from being burnt away; at the same time I
obtain a much firmer fastening for the tubes than with the commonly adopted
plan of beading them over on the outside of the tube plate. The recesses c c
are bored concentric with the tubes B B B of any convenient diameter & depth,
the latter I prefer to make equal to the thickness of the metal in the tube, so that
after the end has been turned back & bedded in the bottom of the recess, it is
just flush with the surface of the plate. By this means I protect the ends of the
tubes from the flames & at the same time leave no ledge for ashes or dirt to rest
upon.
:
Having now fully described & ascertained the nature of my said invention &
in what manner the same is to be performed, I declare that what I claim is
1st. In locomotive & other steam boilers the use of small holes in the tube
plates substantially as herein before described & illustrated by the drawings.
2nd. In locomotive & other steam boilers the formation of recesses in the tube
plates for fixing the ends of the tubes substantially as hereinbefore described &
illustrated by the drawings.
Dated this h
A
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