Improvements in Grate Bars and other Apparatus connected therewith employed in Steam Boiler Furnaces.
Year: 1891

page_text: Date of Application, 13th Apr., 1891
Complete Specification Left, 12th Jan., 1892-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Grate Bars and other Apparatus connected therewith
employed in Steam Boiler Furnaces.
We, ROBERT HADDON, of Clark Bridge Mills, Halifax, in the County of York.
Manager, and ALFRED CLAYTON of the same place, Engineer, do hereby declare
the nature of this invention to be as follows:-
Our invention has reference to grate bars and other apparatus connected
therewith employed in the furnaces of steam boilers, our improvements being
specially designed for the consumption of smoke and economy of fuel. According
to our invention we employ stationary grate bars made with longitudinal projections
on their upper and lower edges, so that when the said grate bars are placed
together or side by side, a longitudinal channel or air space is formed between the
said bars. The ends of each bar rest upon a box or chamber. The furthest bars
within the chamber rest upon a box or chamber comprising the bridge, so that there
is a direct communication between an air admission grate in front of the furnace
and the hollow bridge, so that on cold air entering the grate in front of the boiler,
it passes through the channels formed between each bar, and is conveyed to the
hollow bridge, which air becomes heated in its passage therethrough, and on
emerging from an opening made in the top of the bridge it ignites the smoke and
guses issuing from the fuel, consequently smoke is prevented and additional heat
generated, whereby economy of fuel is effected.
The formation of channels between the grate bars permitting a continuous
passage of cold air therethrough keeps the bars cool, thereby rendering them more
capable of resisting the action of the fire, and also prevents the formation of
" clinkers."
We also employ a steam pipe with a jet entering or pointing towards each
channel formed between the bars, so that on steam being discharged through the
jets, the dust and ashes, which may be lying within the channels, are removed, and
the air space kept clear, whereby the fire will be made to burn more brightly.
The bottom of the bridge is loose and can be moved upon hinges for the purpose
of discharging the dust and ashes which collect therein, this being effected by means
of a rod having a handle at the front of the fu. nace, which can be operated by the
workman when required.
By the arrangement and combination of parts as above described, the grate bars
will be found more durable, and a greater amount of heat will be generated than
formerly, whilst the smoke will be consumed and an economy of fuel effected.
Dated this 11th day of April 1891
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
Improvements in Grate Bars and other Apparatus connected therewith
employed in Steam Boiler Furnaces.
We, ROBERT HAddox, of Clark Bridge Mills, Halifax, in the County of York,
Manager, and ALFRED CLAYTON, of the same place, 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:-
Our invention has reference to grate bars and other apparatus connected
therewith employed in the furnaces of steam boilers, our improvements being
specially designed for the consumption of smoke and economy of fuel.

page_text: In order that our invention may be more fully understood we will now make
reference to the annexed sheet of drawings which illustrates our improvements in
furnace bars.
Fig. 1 is longitudinal section of our improved furnace.
Fig. 2 is cross section of same taken through the line 1 and 2 of Fig. 1 ; and
Fig. 3 is a plan of the same.
A are stationary grate bars made with longitudinal projections a on both their
upper and lower edges so that when the said grate bars are placed together as
shewn in the drawings, the longitudinal channel or air space is formed between
the said bars. The bars at the rear of the furnace rest upon a box or chamber B
comprising the bridge of the furnace, whilst the bars nearest the furnace doors rest
upon the dead plate C, but there is also in the middle of a furnace a hollow box or
chamber D for the opposite ends of both bars to rest upon; it will therefore be seen
that between the dead plate and the hollow bridge B that there is a direct com-
munication between the outside of the furnace and the bridge, so that on cold air
entering underneath the dead plate it is free to pass between the longitudinal
channels formed between each pair of grate bars which conducts it to the
bridge B in a highly heated condition and when it emerges from the opening E in
the hollow bridge B the said heated air will impinge against the smoke and gases
arising from the fuel which will be ignited thereby, consequently, the same is
consumed and additional heat generated, whereby smoke is prevented and economy
of fuel effected.
The forming of channels & between the grate bars which permit a continuous
passage of cold air therethrough keeps the bars cool thereby rentering them more
capable of resisting the action of the fire and also prevents the forming of
clinkers.
In combination with our improved bars we employ a perforated steam pipe F
arranged in front of the boiler the perforations in the said pipe being arranged or
pointing towards each channel & formed between the bars, so that on steam being
discharged through the perforations the dust and ashes which may be found within
the channels are removed and the air-space kept clear whereby the fire will be made
to burn more brightly.
The bottom of the bridge B is loose at G and connected by rod H. to a handle I
in front of the furnace, so that the workman by drawing forward the handle I will
remove away the bottom of the box for the purpose of discharging the dust and
ashes which collect therein.
By the arrangement and combination of parts as above described, the grate bars
will be found more durable and a greater amount of heat will be generated than
formerly, whilst the smoke will be consumed, and an economy of fuel effected.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is
Firstly. The employment of furnace bars arranged with channels & communicating
with a hollow bridge in manner and for purposes described.
Secondly. The use of furnace bars arranged with channels & communicating with
a hollow bridge, the latter having a moveable door for discharging the ashes, all as
described.
Thirdly. The use of furnace bars arranged with channels communicating with
a hollow bridge, in combination with a perforated steam pipe, all as described.
Dated this 11th day of January 1892.
TASKER & CROSSLEY,
Halifax, Agents.