Improvements in Mechanical Stoking Apparatus.
Year: 1895

page_text: Date of Application, 8th June, 1895
Complete Specification Left, 6th Mar., 1896-Accepted, 11th Apr., 1896
Improvements in Mechanical Stoking Apparatus.
A communication by JEAN PAUL SCHMIDT, of 6 Charitéstrasse, Berlin, in the
Empire of Germany, Engineer.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster 118 New Street, Birmingham in the
County of Warwick and 31 High Holborn in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object an improved mechanical stoking apparatus with
an oscillating or rocking feeding or throwing device, the effect of which is to
produce a perfectly even distribution of the fuel thrown onto the grate, which is
only possible to an incomplete extent with the stoking appliances hitherto
employed.
In this improved apparatus as in other similar furnaces, the fuel falls from
a hopper onto a feed wheel which is divided into several compartments, and is
enclosed in a casing, and is slowly rotated by means of a shaft.
By the present invention, scoops arranged tangentially on the feed wheel are
provided with bars or flanges on their outer edges, which bars have for their object
to afford an easy passage of the layer of fuel lying above them, as larger pieces of
coal are either forced out on the rotation of the feed wheel, or crushed between the
edges of the compartments and the sharp part of the casing where the fuel enters.
On the rotation of the wheel, the coal falls into a chamber beneath, in which scoops
mounted on a spindle rapidly rotate and thus throw, through the mouth or spout of
the chamber and on to the grate, the coal which falls into the chamber.
The invention further consists in the chamber, which contains these throwing
scoops, being formed, instead of as a fixed piece as hitherto, of two parts which
together produce a hollow cylinder but overlap one another, the lower part being
movably arranged on. the shaft of the throwing scoops, so that the two parts may
be given a certain movement or adjustment one on the other. Any stoppage of the
movement by a lodging of the fuel between the two parts is prevented by the
overlapping aforesaid.
One part of the movable part of the case which engages over the fixed part
is so shaped that both parts together have internally a generally cylindrical surface.
The rocking or oscillating motion of the lower or movable part serves to impart to
the coal ejected by the throwing mechanism the necessary direction for distributing
it evenly over the grate. The mouth or spout of the throwing chamber is further
widened at the sides towards its opening, so that the coal may be distributed also
in a lateral direction over the whole grate.
or
The mechanism for rocking or oscillating the movable part of the casing
chamber consists of a pin attached thereto, which projects through a slot in a
fixed outer dust casing and a connecting rod which engages at one end with this
pin and at its other end with the crank pin of a ratchet wheel. This ratchet wheel
is keyed fast on the shaft of the feed wheel and serves also for operating said feed
wheel and receives motion by means of pawls carried by a lever which is operated
by means of a draw bar from the driving mechanism for operating the stoking,
which mechanism need not be here described.

page_text: It will be readily understood that instead of the crank pin any other suitable
mechanism may be employed; for instance, a cam wheel or eccentric seated on the
shaft of the feed wheel by means of which cam wheel it is possible to suitably vary
the angular speed of the oscillating or rocking movement of the lower part of the
throwing chamber in the various positions.
Dated this 7th day of June 1895
A communication by JEAN PAUL SCHMIDT, of 6 Charitéstrasse, Berlin, in the
Empire of Germany, Engineer.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, 118 New Street, Birmingham in the
County of Warwick and 31 High Holborn, in the County of Middlesex, Civil
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 :-
This invention has for its object an improved mechanical stoking apparatus with
an oscillating or rocking feeding or throwing device, the effect of which is to
produce a perfectly even distribution of the fuel thrown onto the grate, which is
only possible to an incomplete extent with the stoking appliances hitherto
employed.
The invention is shown in the accompanying drawings, in which,
Figure 1 is a longitudinal section of a stoking apparatus of this kind employed
with a fire tube boiler;
Figure 2 is an elevation, showing part of the operating mechanism; and
Figure 3 is a plan of the inner movable case for the feeding scoops or shovels.
In this improved apparatus as in other similar furnaces, the fuel falls from a
hopper a on to a feed wheel c which is divided into several compartments, and is
enclosed in a casing b and is slowly rotated by means of a shaft d.
By the present invention, scoops arranged tangentially on the feed wheel are
provided with bars or flanges c' on their outer edges, which bars have for their
object to afford an easy passage of the layer of fuel lying above them, as larger
pieces of coal are either forced out on the rotation of the feed wheel, or crushed
between the edges of the compartments and the sharp part of the casing at 61 where
the fuel enters. On the rotation of the wheel, the coal falls into the chamber
beneath, in which scoops e mounted on a shaft frapidly rotate and thus throw,
through the mouth or spout h¹ of the chamber and on to the grate, the coal which
falls into the chamber.
The invention further consists in the chamber which contains these throwing
scoops, instead of being formed as a fixed piece as hitherto, being formed of two.
parts g and which together produce a hollow cylinder but overlap one another,
the lower parth being movably arranged on the shaft of the throwing scoops, so
that the two parts may be given a certain movement or oscillation one on the other.
Any stoppage of the movement by a lodging of the fuel between the two parts, is
prevented by the overlapping aforesaid.
One part of the movable part of the case which engages over the fixed part g
is so shaped that both parts together have internally a generally cylindrical surface.
The rocking or oscillating motion of the lower or movable part (the extreme

page_text: positions of which are shown in full and dotted lines respectively in Figure 1)
serves to impart to the coal ejected by the throwing mechanism the necessary
direction for distributing it evenly over the grate. The mouth or spout h' of the
throwing chamber is, as shown in Figure 3 in plan view, further widened at the
sides towards its opening, so that the coal may be distributed also in a lateral.
direction over the whole grate.
The mechanism for rocking or oscillating the movable part of the casing or
chamber consists of a pin p attached thereto, which projects through a slots in a
fixed outer dust casing k and a connecting rod q which engages at one end with this
pin and at its other end with the crank pin r of a ratchet wheel n. This ratchet.
wheel is keyed fast on the shaft d of the feed wheel and serves also for operating
said feed wheel c and receives motion by means of pawls m³ carried by a lever m.
which is operated by means of a draw bar o from the driving mechanism (which is
not shown in the drawing) for operating the stoking, which mechanism need not be.
here described.
It will be readily understood that instead of the crank pin r, any other suitable
mechanism may be employed, for instance, a cam wheel or eccentric seated on the
shaft d of the feed wheel, by means of which cam wheel it is possible to suitably
vary the angular speed of the oscillating or rocking movement of the lower part
and h¹ of the throwing chamber in the various positions.
Having now particularly described and ascertained the nature of the said inven-.
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. In mechanical stoking apparatus with throwing scoops rotating on a horizontal.
shaft, the arrangement on said shaft of a chamber having a tangentially directed
mouth or spout and adapted to oscillate on the said shaft, with the object of
effecting an even distribution of the fuel over the whole grate, substantially as
described.
2. In a mechanical stoking apparatus, a cylindrical casing for the throwing
scoops, comprising an upper stationary part, and a lower part with spout adapted
to be oscillated, the two parts engaging over one another in such a way that their
inner surfaces form a cylinder, substantially as described.
3. In a mechanical stoking apparatus, an oscillating chamber having a throwing
mouth or spout widened laterally towards its exit opening, substantially as and for
the purpose set forth.
4. In a mechanical stoking apparatus, a feed wheel having bars or flanges at the
outer edges of its scoops so as to narrow the feed opening substantially as and for
the purpose set forth.
Dated this 5th day of March 1806
WM. P. THOMPSON & Co.,
Agents.