IMPROVE- MENTS IN FURNACES FOR LOCOMOTIVE AND OTHER STEAM BOILERS
Year: 1884

page_text: I JOSEPH SAWYER, of 63 Alma Street, New North Road, in the County of
Middlesex, Engineer, do hereby declare the nature of my Invention for IMPROVE-
MENTS IN FURNACES FOR LOCOMOTIVE AND OTHER STEAM BOILERS
to be as
follows:-
و"
My invention relates to furnaces for locomotive and other steam boilers, and
has for its object economy in fuel, the prevention of clinkers, and the greater
durability of the bars.
I fix a cast iron frame at the lower part of the fire box of a locomotive boiler,
or boiler of the locomotive type, and secure the same by screws or bolts. This cast
iron frame is furnished with recesses to receive the ends of the fire bars at the
back of the furnace, such recesses being made either in the casting or by fixing
plates thereto; sufficient space being allowed for the expansion of the bars
lengthwise.
At the front of the cast iron frame I fix a wrought iron spindle in suitable
bearings, and upon this spindle I fix either cast or wrought iron flanged levers,
which fit into recesses cast in the bottom edges of the fire bars resting on the lever
flange.
When the levers are moved, by hand or otherwise, such motion imparts a
reciprocating motion to the bars, and I arrange such levers so as to impart such
motion to a portion of the bars at one time in some cases, or to alternate bars in
opposite directions.
By these means the air spaces between the bars are effectually kept free from
clinkers and scoria.
I also (in the case of locomotive boilers) fix a wrought iron shield at each end of
the fire bars to regulate the admission of air to the furnace, when running at
different speeds.
I form the furnace bars in one length, and provide semicircular openings or
apertures on the top edge of the bars, at equal distances apart, which apertures
assist the combustion by facilitating the access of air to the fuel.

page_text: I form the bridge by building a fire brick arch near the back of the furnace,
leaving a space or opening between the top of the fire bars and the internal circle
of the arch, and upon this arch I build a perpendicular wall of similar materials,
to nearly the height of the fire box. This arrangement leaves a space between the
wall and the tubes in the boiler, and divides the draught; one portion being
carried downwards under the arch, before reaching the tubes, and another portion
ascending in front of the brick arch, over the top of which it passes to the tubes.
Both these currents are under the control of the shields herein before mentioned.
It is obvious that my said invention is applicable to steam boilers of every
description, with slight modifications to suit the various form of furnacea.

page_text: I JOSEPH SAWYER of 63 Alma Street New North Road in the County of
Middlesex Engineer do hereby declare the nature of my Invention for IMPROVE-
MENTS IN FURNACES FOR LOCOMOTIVE AND OTHER STEAM BOILERS 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 Furnaces for locomotive and other steam boilers, and
has for its object economy in fuel, the prevention of clinkers, and the greater
durability of the bars.
I fix a cast iron frame at the lower part of the fire box of a locomotive boiler, or
boiler of the locomotive type, and secure the same by screws or bolts. This cast
iron frame is furnished with recesses to receive the ends of the fire bars at the back
of the furnace, such recesses being made either in the casting or by fixing plates
thereto; sufficient space being allowed for the expansion of the bars lengthwise.
At the front of the cast iron frame I fix a wrought iron spindle in suitable
bearings, and upon this spindle I fix either cast or wrought iron flanged levers,
which fit into recesses cast in the bottom edges of the fire bars resting on the lever
flange.
When the levers are moved, by hand or otherwise, such motion imparts a
reciprocating motion to the bars and I arrange such levers so as to impart such
motion to a portion of the bars at one time in some case or to alternate bara in
opposite directions.
By these means the air spaces between the bars are effectually kept free from
clinkers and scoria.
I also (in the case of locomotive boilers) fix a wrought iron shield at each end of
the fire bars to regulate the admission of air to the furnace, when running at
different speeds.
I form the furnace bars in one length and provide semicircular openings or
apertures on the top edge of the Bars at equal distances apart, which apertures
assist the combustion by facilitating the access of air to the fuel.
I form the bridge by building a fire brick arch near the back of the furnace,
leaving a space or opening between the top of the fire bars and the internal circle
of the arch and upon this Arch I build a perpendicular wall of similar materials to
nearly the height of the Fire Box. This arrangement leaves a space between the
wall and the Tubes in the Boiler, and divides the draught, one portion being
carried downwards under the arch, before reaching the tubes, and another portion
ascending in front of the brick arch, over the top of which it passes to the Tubes.
Both these currents are under the control of the shields herein before mentioned.
It is obvious that my said invention is applicable to Steam Boilers of every
description, with slight modifications to suit the various forms of furnaces.
And in order that my said invention may be more particularly described and
ascertained reference is hereby made to the accompanying drawings, in which
similar letters of reference indicate corresponding parta
Fig 1. is a longitudinal vertical section of so much of the fire box of a locomotive
engine as relates to my invention, Fig 2 is a transverse section of the same, and

page_text: Fig 3. a horizontal section.-a is a wall of fire bricks, erected against the lower
part of the tube plate under the tubes, and b is another wall or baffler, fixed as
shewn in Figs 1 & 2. In some cases I carry up the wall as shewn in dotted lines
in Fig 1 with openings in the same.-The furnace bars c c are formed with curved
recesses a c¹ for the access of air and the shearing of clinkers.-I usually construct
every alternative bar sightly shorter than the remainder of the furnace bars and
provide a rocking bar d with leverse attached thereto, the ends of which enter
recesses f. The rocking bar d is provided with a handle and lever g. whereby the
alternate bars are occasionally rocked by hand, for clearing the Bars and admitting
air to the fuel. The Bars may be sustained on brackets h, or by any other
suitable means. kk are the usual wrought iron shields for admitting air to the
fire box and by means of which the admission of air can be regulated, but I do not
claim these Shields as part of my invention.
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
1 The manufacture and use of furnace bars, for the purposes aforesaid, having
curved recesses in their upper surfaces substantially as described and shewn at c
and c¹ on the drawings.
2 In furnaces for the purposes aforesaid the combination of the wall a and
baffler b substantially as and for the purposes described and shewn on the
drawings.
:
3 The general combination and arrangement of parts together forming my
improvements in furnaces for locomotive and other steam boilers, substantially as
hereinbefore described and shewn on the drawings.
GEO. DOWNING,
Agent for Applicant.