IMPROVEMENTS IN THE CONSTRUCTION AND ARRANGEMENT OF FURNACE BARS AND IN TH_COM- BINATION AND ARRANGEMENT WITH SUCH IMPROVED FIREBARS OF APPLIANCES FOR SUPPLYING FUEL TO THE FURNACE
Year: 1883

page_text: LETTERS PATENT to Charles John Chubb of No 2 Frederick's Place Clifton
in the county of Gloucester for an invention of IMPROVEMENTS IN THE
CONSTRUCTION AND ARRANGEMENT OF FURNACE BARS AND IN TH_COM-
BINATION AND ARRANGEMENT WITH SUCH IMPROVED FIREBARS OF APPLIANCES
FOR SUPPLYING FUEL TO THE FURNACE,
PROVISIONAL SPECIFICATION left by the said Charles John Chubb at
the Office of the Commissioners of Patents on the 26th January 1883.
CHARLES JOHN CHUBB of [N°] 2 Frederick's Place Clifton in the County of
Gloucester. IMPROVEMENTS IN THE CONSTRUCTION AND ARRANGEMENT OF FURNACE
BARS AND IN THE COMBINATION AND ARRANGEMENT WITH SUCH IMPROVED FIRE-
BARS OF APPLIANCES FOR SUPPLYING FUEL TO THE FURNACE
The Invention consists in placing the firebars transversely to the direction of
the draught or length of the furnace and in causing such fire bars to rotate on
their longitudinal axes in such a manner as to cause the fuel upon them to travel
during combustion from the front to the back of the furnace,
In perforating or slotting such rotating fire bars so as to allow of the free access
of air to the fuel,
In making such fire bars of such sections or shapes as to convey a vertical as
well as a lateral motion to the fuel so as to open such fuel and allow air to pass
through the same for the purposes of combustion,
In constructing the bearing bars for supporting such fire bars in such manner as
that the fire bars may be supported and freely revolve and in making one or more
of such bearing bars hollow so as to contain the machinery for communicating the
revolving motion to the fire bars,
In combining with the grate formed with rotating fire bars as above described
a hopper placed at the front of the furnace to contain the supply of fuel the
bottom of which hopper is formed by some of the said rotating fire bars and the
supply of fuel to the furnace is regulated by the speed at which the bars rotate
or by a shutter or moveable place which will open or contract the space through
which the fuel has to pass from the hopper or by the combined action of the bars
and shutters.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles John Chubb in the Great Seal Patent Office on the
26th July 1883.
CHARLES JOHN CHUBB of 2 Fredericks Place Clifton Bristol "IMPROVEMENTS
IN THE CONSTRUCTION OF FURNACE FIRE BARS AND IN THE COMBINATION AND
ARRANGEMENT WITH SUCH IMPROVED FIRE BARS OF APPLIANCES FOR SUPPLYING
FUEL TO THE FURNACE"
I place the Fire bars transversely to the direction of the draught or length of
the Furnace and by means of a connecting rod or rods and cranks or other suitable
mechanical contrivances fastened to the end or both ends of such Fire bars I
cause such Fire bars to rotate simultaneously on their longitudinal axes in such
a manner as to cause the fuel on them to travel during combustion from the front
to the back of the furnace.
I perforate or slot such rotating firebars so as to allow of the free access of air
to the fuel.
I make such rotating fire bars of an oval shape or cross section and
lay them
parallel to each other so that the long or short cross section or diameter of each
fire bar is at right angles (or nearly so) to the corresponding cross section or
diameter of the next adjacent firebar. The firebars being theu coupled together
by means of the connecting rod or rods as above described are caused to rotate
simultaneously so that while revolving their peripheries always remain at the same
distance from each other and the space between such fire bars does not vary and
by means of the relative position at which the said fire bars are laid to each other
as to their diameters as above described and the alternate raising and depression
of the long diameters of the said fire bars as they revolve a vertical as well as a
lateral movement is imparted to the fuel upon them so as to open the same and
allow the air to pass through for the purpose of combustion.
I make the bearing bars which support the fire bars in such a manner as that
the firebars may be supported and freely revolve and I make one or more of such
bearing bars hollow so as to contain the machinery for communicating the revolving
motion to the firebars.
I combine with the grate formed with rotating firebars as above described a
hopper placed at the front of the furnace to contain the supply of fuel the bottom
of which hopper is formed by some of the said rotating firebars and the supply
of the fuel to the furnace is regulated by the speed at which the bars rotate
or by a shutter or moveable plate which will open or contract the space through
which the fuel has to pass from the hopper or by the combined action of the bars
and shutter.
Having now described the nature of my said Invention and how the same is to
be performed I would remark in conclusion that I do not claim as my Invention
the rotating of the fire bars nor the slotting or perforating thereof nor the precise
mechanical contrivance by which such rotary motion is imparted to the fire bars as
above described nor the method by which the supply of fuel to the furnace is
regulated but what I claim and desire to be secured is
1 Making the transverse perforated fire bars of an oval section and each of a
similar section in the same furnace.
2 Coupling such fire bars together in the position above described and causing
them to revolve in such position so that while revolving their peripheries remain
at the same distance from each other.
3 Making the oval section of the said fire bars more or less oval so as to cause

page_text: more or less vertical movement and thus to suit the description of fuel to be
consumed upon them.
4 The combination of such oval fire bars with the rotary motion perforation and
regulating apparatus as above described.
In witness whereof I the said Charles John Chubb have hereunto set my hand
and seal this twenty sixth day of July in the year of our Lord One thousand
eight hundred and eighty three
Signed sealed and delivered by the
above named Charles John Chubb
in the presence of
R. E. H. FISHER
11. Pancras Lane Sol.
E.C.
CHARLES. J. CHUBB (L.S.)