Improvements in Kilns of the Hoffman Type.
Year: 1893

page_text: Date of Application, 16th Nov., 1893
Complete Specification Left, 11th Apr., 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Kilns of the Hoffman Type.
GEORGE DEAN Hatherley Cottage North Street Exmouth Devon do hereby
declare the nature of this invention to be as follows :-
:-
A kiln for burning bricks pipes and other articles made from clay and glazing
them, consisting of an arrangement of chambers and flues designed by myself with
a view to obtain the maximum amount of good work in quickest manner and at the
minimum of cost.
As shown on diagrams A B & C smoke flues marked 3 run underneath the
foundation walls on each side leading to the stack. Hot air flues marked No. 2 run
round on the top of the walls near the outer edge and are led into the chambers by
wickets marked W.
The outlet for steam on the top of chambers marked No. 1 lead to the stack
independent of the smoke flues.
The diagrams show a ten chamber kiln holding about 165,000 bricks that is
4 chambers on each side and one at each end.
Dated this Fifteenth day of November 1893.
COMPLETE SPECIFICATION.
Improvements in Kilns of the Hoffman Type.
I GEORGE DEAN, of Hatherley Cottage, North Street, Exmouth, in the County
of Devon, England, Brick Burner, 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 :-
My invention relates to that class of kiln, for burning bricks, pipes, and other
articles made from clay, which is known as the "Hoffman kiln," and my objects
are, to provide certain passages or flues for the better regulation of the heat, and
also to allow the steam which is generated by the evaporation of the moisture from
the green bricks to freely escape, and thus obtain the maximum amount of work in
the quickest manner, and at the minimum of cost.
But in order that my invention may be better understood 1 will now refer to the
accompanying sheet of drawings which are to be taken as part of this Specification
and read therewith.
Figure 1, is a longitudinal section of a ten chambered kiln, Figure 2, is a plan,
whilst Figure 3, is a cross section, and Figure 4, is an enlarged sectional, detail
view.
Similar letters of reference indicate similar or corresponding parts where they
occur in the several views.
The various parts of the kiln are constructed in the usual manner, and it is
provided with a suitable number of chambers similar to (A) with which the passage
ways (B) communicate; (C) are feed holes, and (D) the chimney stack.
Now my improvements consist of, firstly, constructing the smoke flues (E)
and (E) beneath the side foundation walls, in order that their capacity may be
increased and a greater draught obtained. Each chamber (A) is provided with a
smoke outlet flue (F) (Figure 4), which leads to the respective main flue (E)

page_text: communicating with the chimney stack. (G) is a door, for cleaning purposes, and
(H) is a regulating damper.
;
Secondly, the arrangement, around the upper portion of the kiln, of an enclosed
channel or flue (I), termed the "hot air flue" which communicates with the
chambers (A) through the apertures (J) having bell caps (K) fitted thereon
branches (1) are led downwardly from said hot air flue to the wickets (L) leading
into the chambers (A); (M) are dampers for cutting off the supply of hot air to
said chambers when necessary, and (N) are sliding doors to facilitate the escape of
the hot air, when the kiln is required to be cooled.
Thirdly, forming longitudinally, between the chambers, a passage way or flue (0)
termed the "steam passage," into which the steam, arising from the green bricks,
enters, through the openings (P), (in the chambers (A),) leading to branch
steam passages (0¹), and finally to the chimney stack (D), as shewn in Figure 2;
bell-caps similar to (Q) are fitted upon each opening (P), and (R) are sliding doors
for cleaning or regulating purposes.
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,―
Firstly. In Hoffman kilns, the combination and arrangement with the
chambers (A), of the smoke flues (E) and (E), the outlet flues (F), each having
a door (G) and regulating damper (H), substantially as and for the purposes herein
described and as illustrated in my drawings.
Secondly. In Hoffman kilns, the combination and arrangement with the
chambers (A) of the hot air flue (1) provided with the branches (I), as and for
the purposes herein described and as illustrated in my drawings.
Thirdly. In Hoffman kilns, the combination and arrangement with the
chambers (A) of the steam passage (O) having branches (O¹), as and for the
purposes herein described and as illustrated in my drawings.
Dated
• 1904
W. D. ROWLINGSON,
67-69, Chancery Lane, London, W.C., Agent for Applicant.