Improvements in Drying-machines suitable for Refuse and other Matters.
Year: 1890

page_text: Date of Application, 3rd Mar.. 1890
Complete Specification Left, 2nd Dec., 1890-Accepted, 28th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Drying-machines suitable for Refuse and other
Matters.
I, JOHN FORSYTH JOHNSTONE, of Belvedere, in the County of Kent, Chemical
and Manure Manufacturer, do hereby declare the nature of this invention to be as
follows:-
:-
According to this invention I arrange a number of semi-cylindrical troughs in
the flue of a furnace in steps, each trough being below and in advance of the
preceding one. Each trough is provided with a shaft which carries stirring or
scraping blades by which the material to be dried is fed forward along the trough
until comes to the end and drops into the next. The troughs are made of such
a length that it is unnecessary to support these shafts anywhere except at their
ends; this prevents the liability of choking which occurs in long troughs where the
stirring shafts have to be supported at places other than their ends.
.
The troughs or some of them are heated by water or steam jackets which at
the same time prevent undue heating by the furnace. Preferably only one furnace
is employed to heat both the jackets and the flue. Each trough is provided with
a semi-cylindrical cover. This cover, at the feed end of the trough, is connected
by a pipe to the exhaust fan whilst at the other end of the trough there is a hole or
holes to admit the products of combustion from the flue into the interior of the
trough and so aid in drying the material.
Dated this First day of March 1890.
JOHN FORSYTH JOHNSTONE.
Improvements in Drying-machines suitable for Refuse and other
Matters.
I, JOHN FORSYTH JOHNSTONE, of Belvedere, in the County of Kent, Chemical
and Manure Manufacturer, 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 :-
According to this invention I arrange a number of semi-cylindrical troughs in
the flue of a furnace in steps, each trough being below and in advance of the preceding
one. Each trough is provided with a shaft which carries stirring or scraping blades
by which the material to be dried is fed forward along the trough until it comes to
the end and drops into the next. The troughs are made of such a length that it is
unnecessary to support these shafts anywhere except at their ends; this prevents the
liability of choking which occurs in long troughs where the stirring shafts have to
be supported at places other than their ends.
The troughs or some of them are heated by water or steam jackets which at the
same time prevent undue heating by the furnace. Preferably only one furnace is
employed to heat both the jackets and the flue. Each trough is provided with a
semi-cylindrical cover. This cover, at the feed end of the trough, is connected by
a pipe to the exhaust fan whilst at the other end of the trough there is a hole or
holes to admit the products of combustion from the flue into the interior of the
trough and so aid in drying the material.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of an apparatus constructed according to my
invention, and Figures 2 and 3 are transverse sections of the same to a larger
scale on lines X X, Y Y, (Figure 1).
The apparatus as shown is provided with five troughs A of semi-circular section
each having a semi-circular cover B, ends C and D, and a central shaft E which
carries scrapers F. The ends of the shafts E carry pulleys E' which are driven
by belts from pulleys E2 on a shaft E³. The troughs are made with two bottoms as
shown water or steam being circulated between the bottoms, the inlet and outlet
pipes may be arranged in any convenient manner and are not shown on the drawings.
The troughs AA are arranged in steps one below the other, as shown in Figure 1,
and are enclosed in a flue (also arranged in steps), G G being the side walls and H H
the cover plates. The bearings for the shafts E are carried by girders J J whose
ends are built into the brickwork. Preferably the ends C and D are secured to the
girders J J. The troughs are carried by bearers K K whose ends are also built
into the brickwork. L is the furnace grate and M is a perforated plate above it
which prevents most of the products of combustion from striking directly on to the
first trough. At one end of each of the covers B is a hole N which admits the
products of combustion into the interior of the trough, and at the other end of
the cover there is a pipe O which leads to an exhaust or chimney not shown in the
drawings. P is a hopper supplying material to the first trough, the dried material
escaping at the end of the last trough.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. Drying machines in which there are a number of troughs communicating with
each other, each trough having within it a shaft supported at its ends only and
carrying scrapers substantially as described.
2. Drying machines substantially as described and shown in the drawings.
Dated this First day of December 1890.
JOHN F. JOHNSTONE.