IMPROVEMENTS IN MECHANICAL STOKERS FOR FURNACES
Year: 1884

page_text: I, FREDERICK DUMELLA ROSE, of Flixton, in the County of Lancaster, Engineer, do
hereby declare the nature of my invention for "IMPROVEMENTS IN MECHANICAL
STOKERS FOR FURNACES," to be as follows:
The improvements consist of a revolving cylinder, conveniently mounted, and
placed within the furnace, which cylinder may be composed of fire-clay, or suitable
metal, having an opening at the front end for the purpose of feeding the same with
fuel from a hopper in connection therewith.
The cylinder may be perforated throughout its length or partially, or it may be
provided near the far end, with a slit or other opening in its periphery for the
deposit of the ashes; or both measures may be adopted; or it may be composed of
metal bars.
On the outside of the cylinder is formed a web, or Archimedean screw, in such
manner that, when the whole is rotated, the ashes will be drawn forward to the
front and the flue automatically cleared of the same. In practice, it may be
preferable to place the revolving cylinder at a slight angle to facilitate the travelling
of the coal forward, in which case the web or screw may be of the cone form, where
the bottom of the furnace is flat, or sloping outwards.
The cylinder has rotation communicated to it by means of geared wheels or belt
driving, or other convenient mechanism, and two or more cylinders may be geared
together as in the case of two-flued or marine boilers, and the details of the
improvements may be varied without departing from the peculiar character of the
invention, which consists of the employment of a cylinder revolving within a
furnace space or flue, which cylinder is fed with fuel by means of a hopper and
provided with an external web or screw for withdrawing the ashes resulting from
the combustion of the fuel within the cylinder.
..
T
1001

page_text: g. g are antifriction bowls, or they may be friction pieces, on which one or both
ends of the cylinder may rest.
The revolving or rotating cylinder forming the mechanical stoker may be fed
with fuel either directly through the opening h. h. or may be automatically fed by
means of a hopper j. j, and shoot j', j'. In the case of firing by hand through the
opening h. h, a suitable furnace door k. k is provided, which may have openings
therein, for the admission of air for combustion purposes.
And in the case of the
hopper arrangement, a tube with regulator opening in front may be provided, or
air space left round the shoot to accomplish the same object.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what I
claim is
1. The employment of a revolving or rotating cylinder within the flue of a boiler,
whether such cylinder be perforated or not, or whether such cylinder be provided
with a screw or web for withdrawing the ashes, or not, or whether such cylinder
has its fuel conveyed to it automatically, or by hand firing, for the purpose of
mechanical stoking, and in manner substantially as shewn and described.
2. The application to revolving or rotating cylinders within furnace flues, of a
web or screw for withdrawing the ashes &c., in manner substantially as shewn and
described.
Dated this Seventh day of March 1884