Improvements in the Construction of Fireboxes of Tubular Boilers.
Year: 1891

page_text: Date of Application, 12th June, 1891
Complete Specification Left, 8th Jan., 1892-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Fireboxes of Tubular Boilers.
We, JAMES BLACKBURN of 30 East Parade, Engineer, and JAMES WALLACE
of Ashwood Lodge, Headingley, General Merchant, both of Leeds in the County
of York, do hereby declare the nature of this invention to be as follows:-
The object of our invention is to protect fireboxes of tubular boilers and their
stays from the effects of destructive heat of fire, sulphur and chemical action, at the
same time to economize fuel.
Our improvements consist in the application of a lining of fireclay or other
analogous substance to the interior of fireboxes, such fireclay or analogous substance
having been previously cast or formed and burnt to a suitable degree of hardness.
The lining may be made in one piece and placed in the interior of the firebox, or
made up of sections of the required form, placed in position and held together by
This
fireclay, such fireclay being placed between the sections in a semi-liquid state.
semi-liquid fireclay on being submitted to the heat of the furnace forms a solid
junction between the sections.
The aforesaid lining retains the heat within the furnace which would otherwise
escape therefrom, reducing thereby the consumption of fuel.
Dated this 11th day of June 1891.
J. W. HARDING,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Construction of Fireboxes of Tubular Boilers.
We, JAMES BLACKBURN, of 30 East Parade, Engineer, and JAMES WALLACE,
of Ashwood Lodge, Headingley, General Merchaut, both of Leeds in the County
of York, 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 :-
The object of our invention is to protect fire-boxes of tubular boilers and their
stays from the effects of destructive heat of fire, sulphur, and chemical action, at
the same time to economize fuel, all as hereafter described.
Our improvements consist in the application of a lining of fireclay or other
analogous substance to the interior of fire-boxes, such fireclay or analogous sub-
stance having been previously cast or formed and burnt to a suitable degree of
hardness.
The lining may be made in one piece and placed in the interior of the fire-box,
or made up of sections of the required form, placed in position and held together by
interlocking one with the other, or by fireclay, such fireclay being placed between
the sections in a semi-liquid state.
In order that our invention may be better understood and more easily carried
into effect, we will proceed to describe the same with reference to the accompanying
drawings in which similar letters refer to like parts in all the figures.
Fig. 1 is a longitudinal section shewing part of a tubular boiler having our
improvements applied thereto.
Fig. 2 is a sectional plan of same on line X Y, Fig. 1.
Fig. 3 is a general view shewing a fireclay lining constructed according to our
invention, and

page_text: A, B, C, D are the sections of fireclay lining, situated in the fire-box G and
supported by the edge of the fire-bars E. Each section of fireclay is moulded with
projections on same so as to interlock the one with the other and give a surface for
the liquid fire-clay to cement said sections together.
We have found by practice the form of sections illustrated respectively at
Figs. 3, 4, 5, and 6 to answer our-purpose well, the sections A and C having the
projecting ends A' A' and CC at their upper ends, while the sections B and D
have their projecting parts B' 13' and D' D' at their lower ends. Each
section A B C D has a rim A, B, C, D, at its lower edge, cut off at an angle
of 45° to fit one against the other, and this rim tends to keep the sections in their
proper position.
In applying our improved lining to boilers, the sections B and D may be first
inserted and then the sections A and C, when they will be found to interlock one
with another, fixing themselves thereby in their proper position in the firebox, and
this without the assistance of screws or bolts, though if necessary liquid fireclay may
be employed to fill in the joints between the sections.
Linings constructed according to our invention prevent sulphur fumes and the
direct heat of the fire injuring the firebox and stays, and at the same time retain
the heat within the furnace which would otherwise escape therefrom, thus reducing
thereby the consumption of fuel.
We wish it to be understood that although we have shewn our improved lining
with the projections, and the rim at the base, yet any convenient fastening for the
sections may be employed without departing from our invention.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we do claim is :-
1. In tubular boilers, the sections of previously baked lining, so formed that they
are ready for insertion into the firebox, where they fit one with the other, sub-
stantially as described.
2. In tubular boilers, the sections of lining A, B, C, and D, having pro-
jections A, B, C, and 11, and rim A, B, C, and D2, on same, for interlocking
one with another, substantially as described and shewn.
3. In tubular boilers, the employment of a movable lining, consisting of one or
more pieces, previously baked, which can be inserted in the firebox without requiring
the building up hitherto necessary, substantially as described.
Dated this 8th day of January 1892.
BREWER & SON,
Agents.