IMPROVEMENTS IN OR APPLICABLE TO STEAM GENERATOR OR OTHER FURNACES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
THOMAS SHUTTLEWORTH, Edgeley, Stockport, Engineer, do hereby declare
the nature of my Invention for IMPROVEMENTS IN OR APPLICABLE TO STEAM
GENERATOR OR OTHER FURNACES to be as follows, relating principally to the
furnaces of steam generators, and has for its object to a great extent to prevent
the emission of smoke and to promote the combustion of fuel.
For this purpose, beyond the ordinary fire bars, I place an iron frame casting
for the admission of heated air during the time of firing, which being fitted with
a slanting damper to which is attached a suitable apparatus to allow the said
damper to close slowly after the closing of the furnace door after the ordinary
firing. The apparatus I consider suitable and which I propose to use, is as
follows, I fix between the furnace door and the steam part of the boiler a bracket
on which I place a clock or meter, to the lever of which I attach a rod or chain to
a curved lever or scroll fixed just above the furnace door, the said scroll or lever is
raised whenever the furnace door is opened by means of a plate in which a wheel
is placed (to prevent friction) being attached to the said furnace door, also to the
curved lever or scroll I attach a chain or rod to a bell cranked lever just below the
furnace bars which is attached to a rod running up the flue to the said damper and
by which means the said damper is opened and closed when required. Other air
inlet passages or openings are formed in the back part of the said casting, and
air is allowed to pass through the said passages or openings and beneath a bed of
fire tiles or other suitable materials which are placed between the said casting and
in front of the bridge which is placed further back than ordinarily, the object being
to supply heated air after the said damper has closed so as to consume any after
gases and also to prevent the overheating of the said bod which is kept covered
with incondescent fuel which may be applied from the fire grate at required
intervals. The products of combustion arising from the furnace thus meet the
upward issuing current of heated air and mingling therewith in their passage over
the bed of incondescent fuel, are consumed before passing into the cooler rear of
the flue, thereby in my opinion preventing the formation of black smoke.
Dated this 25th day of June 1884.

page_text: •
THOMAS SHUTTLEWORTH Edgeley Stockport, Engineer, do hereby declare the
naturo of my Invention for IMPROVEMENTS IN OR APPLICABLE TO STEAM
GENERATOR OR OTHER FURNACES and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
Hereunto I attach a Sheet of Drawings illustrative of its application to an
ordinary Lancashire boiler, the said Drawing being made to a scale of about half
an inch to the foot and marked with letters of reference. Letter A represents the
ordinary firebars. B¹ represents the front part of casting to which is suspended a
damper marked E for the admission of heated air to and through bars B placed in
the said casting over or above the said suspended damper. Other-inlet passages
or openings are made in the back part of the casting to admit air to chamber
markod B which is formed of fire tiles or other suitable materials and marked C¹.
C is the aforesaid bed of tiles for the reception and supply of incandescent fuol
extending from bars B³ to bridge marked D which is placed further back than
usual. E is the said suspended damper for the admission of air connected with
and regulated by clock marked H, the two being connected and worked by lever G
and scroll J by means of rods or chains, the arrangement being such that when the
furnace door is opened, the damper E is opened, whereby air is supplied through
bars B and after the fresh charge of fuel is made and the furnace door closed, the
damper marked E is allowed to close slowly, when closed there are still the
openings or passages for the admission of heated air in the back part of the casting
into and through chamber B to bars B so as to supply air for the consumption of
after gases, and also to prevent the overheating of the said bed, and which air
mingling with the products of combustion arising from the furnace in their passage
over the bed of incondescent fuel are consumed before passing into the cooler rear
of the flue, thereby in my opinion preventing the formation of black smoke.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner it is to be performed, I declare that what I
claim is,
First. The furnace constructed and fitted substantially as and for the purpose
set forth in and by the accompanying Drawings.
Secondly. The bed to contain incandescent fuel and air grating between the fire
grate and the bridge, and lastly. The casting embracing B and B with damper
marked E connected with a suitable regulator, substantially as and for the purpose
set forth and indicated.
Doted in AL.
17001