Improvements in connection with Steam Generator Furnaces.
Year: 1892

page_text: Date of Application, 22nd Nov., 1892
Complete Specification Left, 22nd Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in connection with Steam Generator Furnaces.
I JAMES JOHN WILKIE of 14 Castle Street Liverpool, in the County of
Lancaster, Superintending Engineer do hereby declare the nature of this invention
to be as follows:-
The invention relates to steam generators, which are used for obtaining power in
varying quantities such as when it is desired sometimes to drive a steam-ship at
halt-, or other reduced-, instead of full-speed, or where it is required at times to
give motion to part only of the machinery of a work shop, or in like emergencies.
The invention is also of advantage where the same power is to be obtained with
different qualities of fuel.
The object is to so construct and fit certain parts of the furnace,-mainly the
fire-bridge,-that the grate area, and consumption of fuel is readily proportioned to
the power required, or to the heating qualities of the fuel employed; waste of
fuel is thereby avoided and more effective heating surface obtained, and more
efficient combustion ensured.
The invention consists essentially in constructing the fire bridge in such manner
that it may be moved, along the fire bars so as to reduce or increase the grate area.
I combine with such movable bridge one or more dampers connected with or
independent of the said bridge, to prevent passage of air through the bars behind
the bridge. I further provide fingers or equivalent devices to remove clinker or
fuel from between the bars and allow of free motion of the bridge.
Motion is given to the said bridges and dampers by means of screw, lever, or
equivalent devices, and the said bridges are made simple or telescopic, and are
packed with asbestos if desired, so as to obtain air-tight connection between the
said bridges and the fire bars. Antifriction carrying devices are also provided for
the said bridges.
Deted the 21st dov of November 1809
Per pro J. T. KING,
J. Johnson,
Agent.
COMPLETE SPECIFICATION.
Improvements in connection with Steam Generator Furnaces.
I JAMES JOHN WILKIE of 14 Castle Street Liverpool in the County of
Lancaster, Superintending 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:-
The invention relates to steam generators which are used for obtaining power in
varying quantities such as when it is desired some times to drive a steam ship at
half or other reduced, instead of full speed, or where it required at times to give
motion to part only of the machinery of a workshop, or in like emergencies. The
invention is also of advantage where the same power is to be obtained with different
qualities of fuel.
It is well known that the consumption of fuel varies with the fire grate area, and
that the fire grate area is varied according to the evaporation required. In ordinary
marine boilers the consumption per square foot of grate area for moderately good
coal may be put at 18 lbs. and the evaporation per square foot of grate area is
about 150 lbs. of steam. When the proper ratio between grate area and

page_text: Fig. 1 is a vertical section illustrative of my improvements.
a steam generator. b, furnace. c fire bars. d, firebridge. The said firebridge
which is free to be moved to and fro on the bars c; consists of a cast iron frame
fitted with fireclay, or heatresisting material and is carried mainly by bearers on
each side of the fire bars which bearers are shaped to fit close to the sides of the
furnace. e, are back bearers for the bridge. f, bearer for the fire bar ends.
A bracket g is attached to or formed with the bridge frame and passes down
through the fire bars, its lower end being provided with a nut h, and protecting
sleeve i. screwed spindle fitting in the nut h, and carried in a bearing k at the
front of the generator. Motion is given to the said screwed stem by a hand wheel
or key. 1, is a damper formed as part of the bridge frame for preventing the
passage of air through the bars behind the bridge when the bridge is drawn forward.
The said bridge frame is in some cases made with fingers which pass down between
the bars. The said bridge may also be made with rollers to rest on the bearers so
as to facilitate motion.
Fig. 2 is a sectional view showing my improvements applied to a double ended
steam generator. Here the bridge frames are made to fit one within the other.
Fig. 3 is a sectional view in which the operating screw is carried through the
rear of the generator instead of through the front.
m are deflecting plates which act as part of the bridges and serve to make them
telescopic or continuous from front to rear as they are drawn out.
In all the views, like letters denote the same parts.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
First. In steam generator furnaces the combination of the grate bars with a
movable bridge for the purpose set forth.
Second. In steam generator furnaces the combination of the grate bars with a
movable bridge and fingers for the purpose set forth,

page_text: Third. In steam generator furnaces the combination of the grate bars, movable
bridge and dampers for the purpose set forth.
Fourth. In steam generator furnaces, telescopic bridges for the purpose set
forth.
Fifth. Improvements in steam generator furnaces, substantially as set forth.
Doted thin 10th day of Angust 1902
Per pro J. T. KING,
J. Johnson,
Agent.