Improvements in or relating to Furnaces.
Year: 1893

page_text: Date of Application, 30th Mar., 1893
Complete Specification Left, 23rd Dec., 1893-Accepted, 3rd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnaces.
We, THOMAS RADFORD SWAINE of The Eastcroft, General Manager of Night
Soil Department, and THOMAS HARRISON of 9 Northumberland Terrace,
Northumberland Street, Fitter, both in the Borough of Nottingham, do hereby
declare the nature of this invention to be as follows:-
This invention relates to furnaces for recovering the solder used in the construction
of tinware articles and removing the tin coating of used up tinware, tins for
packing meals or fruits, tin scrap and the like.
In carrying out this invention the furnace is preferably formed by a rectangular
chamber constructed of brick or other suitable material, it may be provided at the
side with an opening or openings for the insertion of fuel and the withdrawal of
ashes, and at the ends with openings for the insertion or withdrawal of tins or scrap.
The whole of these openings may be provided with doors hung on hinges or otherwise
suitably arranged so as to permit of ready access to the interior.
Near the bottom of the chamber is a grating, or fire bars carried on suitable
bearers, on which is the fire and at a suitable height above this is a second grating,
and above this a plate or tray preferably slightly smaller than the interior of the
chamber and formed with a fall or incline from the two sides to the centre, and a
fall or incline throughout its length. This tray is preferably arranged on pivots
at its ends so that its contents may be tipped on to the grating below as required.
The opening communicating with the chimney is formed above the upper tray
and the products of combustion pass first through the second grating and its contents,
then through the space between the edge of the tray and interior of the chamber
and then to the outlet.
The tins or scrap are first fed on to the upper tray and the solder is melted
therefrom and is caught by the tray and delivered at the lower end into a vessel in
communication with the tray. After as much metal has been recovered as possible
the tray is tilted and its contents delivered on to the upper grating where they are
subjected to a greater heat to remove all traces of tin or solder, after which they
are removed through the openings in the ends of the chamber.
The tray is returned to its normal position, refilled, and both processes may thus
be carried on at the same time.
After treating the tins, or tin scrap as described the sheet iron which is the
residue is stripped of all traces of tin, and is of commercial value and finds a ready
sale as light scrap iron.
Dated this 30th day of March 1893
W. P. THOMPSON & DOULT,
Agents for the Applicants.

page_text: Improvements in or relating to Furnaces.
We, THOMAS RADFORD SWAINE of The Eastcroft, General Manager of Night
Soil Department and THOMAS HARRISON of 9 Northumberland Terrace,
Northumberland Street, Fitter, both in the Borough of Nottingham, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:—
This invention relates to furnaces for recovering the solder used in the construction
of tinware articles and removing the tin coating from used-up tinware, tins for
packing meat or fruit, tin scrap and the like.
It will be best understood by reference to the accompanying drawings in which
Fig. 1 is an elevation of one end of a furnace constructed according to our
invention.
Fig. 2 is a front elevation and
Fig. 3 an elevation of the reverse end to that shown in Fig. 1.
Fig. 4 is a vertical cross section and
Fig. 5 a longitudinal section.
Fig. 6 is an elevation and
Fig. 7 a plan drawn to a larger scale showing detail.
Like letters indicate like parts throughout the drawings.
In carrying out this invention the furnace is formed by a chamber a preferably
rectangular in plan the walls b of which may be constructed of brick or other
suitable material. It is provided at the front with an opening c for the insertion
of fuel and the withdrawal of ashes, which opening is fitted with a door or
doors c¹.
C
Openings d are also formed at each end for the insertion and withdrawal of the
tins or scrap and these openings are provided each with a door or doors d'.
At the lower part of the chamber a is a grating to carry the fire which grating is
preferably formed of fire-bars e carried by bearers e¹ and at a suitable height above
the fire-grate is a second grating f.
Above the grating is a tray g formed with a fall or incline from the two sides
to the centre and a fall or incline throughout its length. This tray is carried by
pivots gl at its ends working in bearings g' secured to stays or platforms d² extending
across the end openings d so that the tray may be inverted and its contents tipped
on to the grating below.
An opening in communication with a chimney is formed in the top of the chamber
and the products of combustion pass first through the grating ƒ and the material
supported thereon and then pass the tray g to the outlet h.
In order that the contents of the tray g may be more uniformly subjected to the
heat it may be formed with holes i through which the products of combustion may
pass and in order to prevent the melted solder from running through these holes,
on the upper side of each is a raised rim or hood i¹ secured to or forming part of
the tray 9.
.
The tins are first fed on to the tray g and the solder melted therefrom is caught
and collected by it and delivered at its lower end through an opening 9³into a shoot j
which is adapted to slide in a longitudinal direction so that it may be withdrawn
when it is desired to reverse the tray g; it is retained in its operative position by
buttons or fasteners of suitable construction.
The shoot conducts the solder into a box k provided with a removable cover k
and at the side with a door k¹ so as to permit of ready access to the interior the
bottom is formed by a grating which arrests any solid matter brought down with
the solder and which may be subsequently removed through the door k³,

page_text: Below the box k is a trough-shaped drawer into which the solder falls after it
passes through the grating, this drawer is fixed in an inclined position and at its
outer and lower end it is provided with an opening through which the metal may
flow into a vessel or a mould carried by a bracket m.
To facilitate the delivery of the solder into a vessel or mould the drawer / may
be drawn out so as to project over the vessel or mould.
After as much solder has been recovered as possible the tray gis tilted or reversed
and its contents delivered on to the grating where the tins are subjected to a greater
heat to remove all traces of tin or solder, after which they are removed through the
openings d in the end of the chamber.
The tray 9 is returned to its operative position and both processes may thus be
carried on at the same time.
In order that the tins in the tray g may be turned over or stirred about with-
out opening either of the doors d an opening n is formed in one of said doors,
provided with a pivotted or hinged cover n' and through which a rod or lever
may be inserted.
An opening n is also formed in the door d through which the barrel of a winch
handle o (see Figs. 6 and 7) may be inserted and fitted on to one of the pivots g'
which is formed with a square end for this purpose in order to turn or reverse the
tray. This opening may be provided with a pivotted or hinged cover n³.
For retaining the tray g in either its normal or operative position or inverted, a
catch p (Figs. 6 and 7) pivotted to a bracket pl secured to the cross stay or
platform d is provided with a recess which engages with the square end of the
pivot g'.
After treating the tins or tin scrap as described the sheet iron which is the residue
is stripped of all traces of tin and is of commercial value and finds a ready sale as
scrap iron.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a furnace such as described the combination with a grating f of a tray
such as y substantially as described and illustrated in the accompanying drawings.
2. In a furnace such as described the employment of a tipping or reversible
tray such as g substantially as described and illustrated in the accompanying
drawings.
3. In a furnace such as described a tray such as g provided with holes such as i
protected by raised rims or hoods such as substantially as and for the purpose
described and illustrated in the accompanying drawings.
4. In a furnace such as described the combination with a tray g of a box such as k
grating and drawer or receptacle such as substantially as described and illustrated
in the accompanying drawings.
5. In a furnace such as described the combination with a reversible tray such as g
of two superposed gratings ef below it substantially as described and illustrated in
the accompanying drawings.
6. The combination and arrangement of parts constituting the complete furnace
substantially as herein described and illustrated in the accompanying drawings.
Dated this 20th day of December 1893.
THOMAS RADFORD SWAINE.
THOMAS HARRISON.
W. P. Thompson & Boult,
Agents for the Applicants.