IMPROVEMENTS IN FURNACE GRATES
Year: 1885

page_text: I, CHARLES WHITFIELD of Midland Terrace Kettering in the county of
Northampton Engineer do hereby declare the nature of my invention for
IMPROVEMENTS IN FURNACE GRATES to be as follows:-
This invention has for its object an improved method of constructing the
grates of steam-boiler and other furnaces. I so arrange the grate that the front
portion shall consist of bars of the common section so made and constructed as to
secure as much air space as possible and that the back portion where the heat
is more intense shall consist of bars of hollow section, these latter I form by bars
having a groove or channel down one side so that when, any two of them are
placed together in the position they should occupy in the grate the two grooves or
channels form a passage through which the air can pass through and beyond the
bridge The bars placed in the front portion of the grate are so made and
arranged that the air passages in the back portion can be seen and cleaned from
the front of the furnace in the same manner as when the grate is formed
throughout by hollow bars-The bars in the back portion may be cast hollow.
The grate is supported in position by bearings of the ordinary kind. This arrange-
ment combines all the advantages possessed by hollow and common bars and at the
same time renders it possible to renew the whole or any portion of the grate at
much less expence than when the bars are in one length. By this means I effect
and secure smoke consumption with economy.

page_text: 1, CHARLES WHITEIELD of Midland Terrace Kettering in the county of
Northampton Engineer do hereby declare the nature of my invention for
IMPROVEMENTS IN FURNACE GRATES and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention has for its object an improved method of constructing the grates
of steam boiler and other furnaces I so arrange the grate that the front portions
shall consist of bars of the common section so made and constructed as to secure
as much air space as possible and that the back portion where the heat is more
intense shall consist of bars of hollow section. The latter I form by bars having a
groove or channel down one side so that when any two of them are placed together
in the position they should occupy in the grate the two grooves or channels form
a passage through which the air can pass through and beyond the bridge.―The
bars placed in the front portion of the grate are so made and arranged that the air
passages in the back portion can be seen and cleaned from the front of the furnace
in the same manner as when the grate is formed throughout by hollow bars-The
bars in the back portion may be cast hollow-The grate is supported in position
by bearings of the ordinary kind-This arrangement combines all the advantages
possessed by hollow and common bars and at the same time renders it possible to
renew the whole or any portion of the grate at much less expense than when the
bars are in one length-By this means I effect and secure smoke consumption with
economy.
In the accompanying sheet of drawings Fig. I is a plan of the grate showing one
method of arranging the ends of the bars to secure the corresponding of the air
channels through the front and back portions-A is the dead plate and B the
Bridge Fig. II is a longitudinal section of the grate at a. b. showing the air channel
running through the front and back bars and in the direction of the arrow k. l.
Fig. III is a longitudinal section at c. d. and which represents also an elevation of
the front and back bars-Fig. IV is a transverse section of the grate at e. f.
and e f Fig. V is a transverse section at g. h. Fig. VI is a front elevation of
the grate with the dead-plate removed.
I do not contine myself to the precise arrangement and proportions of the grate
shown which may be modified and adapted to the requirements of most furnaces
but 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
A Furnace grate so constructed that the front portion shall consist practically of
bars of the common section and the back portion of tubular or channelled bars the
ends which butt together being so constructed as to maintain a clear air passage
from end to end of the furnace.
Dated this 19th T1 1900
CHAS. WHITFIELD.