Improvements in Feed Mechanisms for Coal Dust Firing.
Year: 1897

page_text: Date of Application, 30th June, 1897
Complete Specification Left, 29th Mar., 1898-Accepted, 7th May, 1898
PROVISIONAL SPECIFICATION.
Improvements in Feed Mechanisms for Coal Dust Firing.
I, CARL WEGENER, of 14-15, Gitschinerstrasse, Berlin, Empire of Germany,
Engineer, do hereby declare the nature of this invention to be as follows:-
:-
The present invention consists of a mechanism designed for use in firing with
coal dust to allow the fuel to fall down in an invariably uniform quantity from
the storage hopper into the air supply channel or directly into the combustion
chamber. This mechanism consists essentially of a horizontal disc rotating on
its axis and placed at the lower contracted end of the supply hopper; upon the
surface of the said disc blades are arranged which cut off thin layers of powdered
fuel and push the same in consequence of their position towards the edge of the
disc, at which point they fall down through the space between the disc and its
envelope. The blade disc can be constructed as a full disc which transports the
powdered fuel to the periphery. It may, however, also consist of an annular disc
and in this case the blades may transport the fuel to the inner or to the outer edge
or to both edges. This mechanism may be completed by a suitable device for
regulating the supply of powdered fuel or to cause the same to cease altogether.
For this purpose it is only necessary that the envelope or casing should approach
by means of a projection closely to the edge of the blade disc, and that either
the blade disc or the casing should be adjustable in the direction of the common
axis. When the edge of the blade disc is in the plane of the projecting portion
of the casing there is no longer any aperture, and the delivery of coal dust is con-
sequently cut off. If the relative position of the blade disc and of the cover be .al-
tered, there will result according to the amount of this alteration a larger or smaller
annular opening between the edge of the blade disc and the casing, through which
opening a larger or smaller quantity of coal dust falls down. In the case of a coal
dust firing apparatus according to Patent No. 17004 of 1894 the casing of the
blade disc is preferably fixed and the disc, which is fastened at the top of the
vertical shaft carrying the distributing cone and driven by the air of combustion
passing through a motor wheel, may be raised or lowered by adjusting the foot
bearing of the said shaft for the purpose of regulating the dust supply.
An especially suitable arrangement of the blades consists in the construction
of the same of an elastic material, such for instance as steel wire, and fastening
of the same to the said disc only at their inner ends which are furthermost removed
from the edge of the blade disc. If then by accident any larger body should become
mixed with the coal dust supply and should reach the edge of the blade disc it
cannot wedge itself between the outer end of the blade and the casing, nor fix the
blade disc fast, nor damage the blade, but the blade will bend inwards and pass
freely over the obstacle.
Dated this 30th day of June 1897.

page_text: Improvements in Feed Mechanisms for Coal Dust Firing
I, CARL WEGENER, of 14-15, Gitschinerstrasse, Berlin, Empire of Germany,
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 present invention consists of a mechanism designed for use in firing with
coal dust to allow the fuel to fall down in an invariably uniform quantity from
the storage hopper into the air supply channel or directly into the combustion
chamber. This mechanism consists essentially of a horizontal disc rotating on
its axis and placed at the lower contracted end of the supply hopper; upon the
surface of the said disc blades are arranged which cut off thin layers of powdered
fuel and push the same in consequence of their position towards the edge of the
disc, at which point they fall down through the space between the disc and its
envelope. The blade disc can be constructed as a full disc which transports the
powdered fuel to the periphery. It may, however, also consist of an annular disc,
and in this case the blades may transport the fuel to the inner or to the outer edge
or to both edges. This mechanism may be completed by a suitable device for
regulating the supply of powdered fuel or to cause the same to cease altogether.
For this purpose it is only necessary that the envelope or casing should approach
by means of a projection closely to the edge of the blade disc, and that either
the blade disc or the casing should be adjustable in the direction of the common
axis. When the edge of the blade disc is in the plane of the projecting portion
of the casing there is no longer any aperture, and the delivery of coal dust is con-
sequently cut off. If the relative position of the blade disc and of the cover be al-
tered, there will result according to the amount of this alteration a larger or smaller
annular opening between the edge of the blade disc and the casing, through which
opening a larger or smaller quantity of coal dust falls down. In the case of a coal
dust firing apparatus according to Patent 17004 of 1894 the casing of the
blade disc is preferably fixed and the disc, which is fastened at the top of the
vertical shaft carrying the distributing cone and driven by the air of combustion
passing through a motor wheel, may be raised or lowered by adjusting the foot
"bearing of the said shaft for the purpose of regulating the dust supply.
An especially suitable arrangement of the blades consists in the construction
of the same of an elastic material, such for instance as steel wire, and fastening
of the same to the said disc only at their inner ends which are furthermost removed
from the edge of the blade disc. If then by accident any larger body should become
mixed with the coal dust supply and should reach the edge of the blade disc it
cannot wedge itself between the outer end of the blade and the casing, nor fix the
blade disc fast, nor damage the blade, but the blade will bend inwards and pass
freely over the obstacle.
In order that my invention may be well understood I will now proceed to describe
the apparatus according to the illustrations shown on the annexed drawing pre-
mising that I do not limit myself to the precise details given therein.
In the drawing Fig. 1 is a perpendicular section of the apparatus in the direction
of the axis of revolution,
Fig. 2 is a plan view of same, whilst
Fig. 3 shows a special part of the apparatus in section according to line 3-3
of Fig. 2.
The annular disc g fixed upon the tubular shaft f is drawn in the shut off posi-
tion in which its edges lie in the same plane with the projecting parts h¹ and h

page_text: of the casing hand in which no outlet aperture is present either inside or outside.
The casing his fixed immovably and the opening of the feed mechanism may be
effected to any desired width of aperture by raising or lowering the shaft f of
the feed disc g. The propulsion is designed to be from the lower end of the shaft f
whilst the upper end revolves in a bearing in the casing h. This bearing can be
conveniently lubricated when the feed holder is empty and the dust cover h° has
been taken off. The disc ġ bears two circles of blades, the outer blades of which
are as well as the inner blades secured at the ends removed respectively from
the outer and the inner edges of the disc in the central periphery line of the annular
disc for instance in such a manner as shown in Fig. 3. These ends are taken
through the disc and secured thereto immovably by rivetting, soldering, or the
like.
A mechanism for raising and lowering the disc g by adjusting the foot bearing
of the shaft f carrying the disc whereby the regulation of the dust forwarded by
means of the disc from the feed hopper into the air tube is effected, is shown in
Fig. 4. This mechanism consists of a lever 1, the smaller arm of which is fixed
to and carries the bearing k of the shaft f whilst its longer arm is connected with
the bar m provided with an adjusting nut n. The index o is attached to the bar
mechanism and shews the amount of the delivery of the dust upon a scale fixed
to the air tube.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I .
claim is :-
1. In a coal dust firing apparatus for the supply of the fuel a horizontal full
or annular disc (g) placed at the lower end of the supply hopper and rotating upon
its axis, upon the upper surface of which are secured blades in such positions that
they remove thin layers of the coal-dust, and thrust the same either to the outer
edge of the disc (blades ¹) or to its inner edge (blades 22) or in both directions
so that the said dust falls down through the annular opening or openings between
the casing and the edge of the disc.
2. A modification of the arrangement set forth in Claim 1, in which for the pur-
pose of regulating the quantity of the dust or completely shutting off the delivery:
of the same the inner or outer edge or both edges of the blade disc are brought
closely to a projecting annular piece (h¹³) of the casing so that in this position
there is no aperture through which coal dust can pass whilst by means of a rela-
tive displacement of the blade disc and the casing in the direction of the common
axis an aperture of the required size can be procured.
3. A modification of the arrangements for coal dust firing apparatus according
to Patent No. 17004 of 1894 provided with a distributing cone and driving wheel
characterized by having the casing fixed and the adjustment of the blade disc
induced by raising or lowering the foot bearing (k) of the shaft-which also sup
ports the cone and the motor wheel-by means of a lever (l) and adjusting-rod (m).
4. A modification of the arrangement set forth in Claim 1 in which the blades
are formed of elastic material as for instance of steel wire, and are only fixed
upon the disc at their inner end furthermost removed from the edge of the disc so
that they are bent back in case of larger bodies entering between their free end and
the casing whereby choking of the blade disc and consequent injury of the blades
is avoided.
ted this 29th day of Maren JOJO.
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester, and Birmingham,
Patent Agents for the Applicant.