Improvements in Hollow Furnace Frames and in the Doors thereof.
Year: 1889

page_text: Date of Application, 22nd Jan., 1889
Complete Specification Left. 22nd Oct., 1889-Accepted, 23rd Nov., 1889
PROVISIONAL DACIA DIGANT
Improvements in Hollow Furnace Frames and in the Doors
thereof.
We SAMUEL CUTLER of Providence Iron Works, Millwall, in the County of
Middlesex, Engineer, and ANDREW DOUGALL Junior of Tunbridge Wells, in the
County of Kent, Manager of Gas Works, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object the construction of furnace frames in such a manner
as to make them generally useful but especially adapted for application to the furnaces
used for heating gas retorts, and the attachment of the furnice doors to the said frames
so that they shall be self sealing and practically air tight, while the opening and
closing of the doors may be easily effected.
The frames are made hollow with two principal doors, the upper one for charging the
furnace with fuel, and the lower one for the removal of clinker. Above the top furnace
door and between it and the lower furnace door, there are openings, each provided
with slides so as to regulate the admission of air to the frames. The air thus admitted
passes down the hollow frame into the channels formed in the setting, before entering
the furnace. By this means a double object is effected, namely, the air becomes
heated before entering the furnace, and the frame is, by absorption of heat from it by
the air, kept comparatively cool, and is thus preserved from the destructive action of
excessive heat.
The doors are made with a projection or short arm on each side and rounded at the
bottom. These arms or projections slide into wedge shaped spaces formed by a lug or
bracket cast on or otherwise attached to each side of the door opening, and as these
lugs are made with rounded surfaces, and the plane of the furnace door opening is
inclined from the perpendicular, the weight of the door will cause it to close the
opening so as to make it practically air tight. Each door is furnished with one, two
or more handles and may be removed by being lifted off the lugs or brackets by the
application of a lever.
Dated this 22nd day of January 1800
COMPLETE SPECIFICATION.
Improvements in Hollow Furnace Frames and in the Doors
thereof.
We SAMUEL CUTLER of Providence Iron Works, Millwall, in the County of
London, Engineer, and ANDREW DOUGALL Junior of Tunbridge Wells, in the County
of Kent, Manager of Gas Works, 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 the construction of furnace frames in such a
manner as to make them generally useful, but especially adapted for application to
the furnaces used for beating gas retorts, and the attachment of the furnace doors
to the said frames so that they shall be self sealing, and practically air tight, while
the opening and closing of the doors may be easily effected.
In order that the invention may be easily understood drawings are attached
hereto, of which the following is a description, Fig. 1 is a front elevation of a
furnace frame with part of each door broken away to show the frame behind.
Fig. 2 is a section of it and Fig. 3 is a side elevation, while Fig. 4 is a plan of

page_text: the same. Fig. 5 is an elevation showing the application of the invention to
ordinary furnace frames, and Fig. 6 is a side view of the same. Fig. 7 is a longi-
tudinal elevation of an appliance for removing the doors from the frames, and
Fig. 8 is a part plan of it. Similar letters refer to the same parts in each-of-the-
views.
The frames A are made hollow with two principal doors B and C, the upper
one B for charging the furnace with fuel, and the lower one C for the removal
of clinker. Above the top furnace door and between it and the lower furnace door
there are openings D and E, each provided with slides so as to regulate the
admission of air to the frames. The air thus admitted passes down the hollow frame A
into the channels formed in the setting, before entering the furnace. By this means
a double object is effected, namely, the air becomes heated before entering the furnace,
and the frame is, by absorption of heat from it by the air, kept comparatively cool,
and is thus preserved from the destructive action of excessive heat. When more
air is required for the furnace than that passing through the hollow frame, a slido T
Fig. 2 is drawn back and the additional air will flow direct to the furnace.
The doors B and C are made with a projection or short arm G on each side,
rounded at the bottom. These arms or projections slide into wedge shaped spaces
formed by a lug or bracket H, cast on or otherwise attached to each side of the door
opening, and as these lugs are made with rounded surfaces, and the plane of the
furnace door opening is inclined from the vertical the weight of the door will cause it
to close the opening so as to make it practically air tight, the inner surface of the
door and the outer surface of the frame being made true by planing or otherwise.
Each door is furnished with one, two or more hooks I and may be removed by being
lifted off the lugs or brackets by the application of a lever J, the floor K being used
as a fulcrum.
may
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Instead of using a plain lever J, the appliance shown in Figs. 7 and 8
employed. This consists of two levers I. L connected together by cross bars M, N, O
and P mounted upon wheels Q like a trolley. When used the apparatus is wheeled
in front of the door so that the cross bar M lies just below the hooks I. Upon
depressing the handles R the door is lifted off and may be taken to a convenient
position. The upper part S of the levers L is made removable so as to suit the
appliance for operating upon the lower doors. When therefore S is lifted off, the
cross bar N becomes available for the removal of such lower doors, in the manner
before described.
In Figs. 5 and 6 the arrangement as applied to ordinary frames is shown.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is.
1. The construction of hollow furnace frames with their attendant slides, and
brackets Harranged as herein described and shown on the drawings.
2. The method of securing the furnace doors by making them with arms or lugs G
rounded at the bottom and capable of being introduced with the brackets, as herein
W. H. BENNETT,
Agent for the Applicants.