Improvements in Marine and Stationary Boiler and other Furnaces.
Year: 1888

page_text: Date of Application, 15th Oct., 1888
Complete Specification Left, 15th July, 1889-Accepted, 12th Oct,, 1889
PROVISIONAL SPECIFICATION.
Improvements in Marine and Stationary Boiler and other
Furnaces.
We, SAMSON Fox of the Leeds Forge, Leeds, in the County of York, Engineer and
Ironmaster, JOHN REED FOTHERGILL of 1 Bathgate Terrace, West Hartlepool, in the
County of Durham, Superintending Marine Engineer, and DONALD BARNS MORISON
of the Hartlepool Engine Works, Hartlepool, in the County of Durham, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has for object to obviate or mitigate injurious effects to the furnaces
of marine and other types of steam boilers resulting from excessive local heating, and
also to improve the combustion by limiting the air admission from the ash pit to the
thicker parts of the fire. For this purpose the side fire bars are so constructed and
arranged next to the sides of the furnace that no air can pass between the said bars
and the sides of the furnace.
This invention can be carried out in various forms. According to one arrangement
a groove or recess or grooves or recesses is or are formed in those parts of the bars
that are to be next to the sides of the furnace, and such groove or recess or grooves
or recesses is or are filled with asbestos rope or other suitable packing material in such
a manner that when the bars are pressed or held against the furnace sides, a practically
air-tight joint will be formed.
Instead of using asbestos in the grooves, narrow fitting strips may be cast on the
side bars, or thin strips of suitable material such as brass or sheet iron be pinned to
the bars and fitted closely to the furnace sides.
In corrugated or similar form of furnaces of marine or other types of steam boilers,
the side bars are made to fit into the corrugations or other forms in the ordinary
manner and the joints above referred to are formed as already described.
The bars may be held in position in any suitable manner, one method being by one
or more studs inserted in the furnace sides and passing through holes in the fire bars,
which holes it will usually be advantageous to make oval.
Dated this 15th day of Ontahan 1800
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Marine and Stationary Boiler and other
Furnaces.
We SAMSON Fox of the Leeds Forge Leeds in the County of York, Civil Engineer,
and Ironmaster, JOHN REED FOTHERGILL of Hartlepool and DONALD BARNS MORISON
of Hartlepool Engine Works Hartlepool in the County of Durham, 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 objects to mitigate or obviate injurious effects caused by
excessive local heating in the furnaces of marine steam boilers and other like furnaces.
and also to improve combustion by limiting the air admission from the ashpit to the
thicker parts of the fire.
For the above purposes furnaces are constructed with fire bars so made and arranged
on the sides of the grates next to the furnace walls that air practically cannot pass
between the said bars and the walls and the said walls are prevented from being heated
to an injurious extent.

page_text: •
Our said invention may be carried into effect under considerable variety of
detail.
According to one modification a recess or groove or recesses or grooves is or are
formed in those parts of the grate bars that are next to the sides or walls of the
furnace and such recess or groove or recesses or grooves is or are filled or fitted with
asbestos rope or other. suitable heat resisting packing material in such a manner that
when the bars are placed in position against the furnace sides or walls or practically
air-tight joint is formed or made between the said bars and the sides or walls of the
furnace.
Instead of using asbestos or like packing in the grooves narrow fitting strips may 1
be cast on the side bars or thin strips of suitable material such as brass or sheet iron
may be pinned or secured to the said bars and made to fit closely to the furnace
walls.
In furnaces having walls of corrugated or similar form such as are generally used
in marine and other boilers the side bars are made to fit the corrugations or other 1
forms and the jointing between the side bars and furnace walls is made of asbestos
rope, or like fire resisting packing as already described.
The bars may be held in position in any suitable manner. One method consists in
using one or more studs inserted in or secured to the furnace walls and passing
through holes in the firebars. It will usually be found advantageous to make the 2
holes in the fire bars oval or elongated.
Furnaces under our invention are well adapted for .use with either natural or forced
draught.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a transverse section fig. 2 a plan and fig. 3 a longitudinal elevation of a
furnace constructed in accordance with our invention. Here the furnace walls a are
cylindrical and are such as are found ordinarily in Cornish and Lancashire boilers.
bordinary firebars. c.fire bars made with a recess or groove d from end to end.
Tho said fire bars c fit close to the walls a of the furnace and are suitable for use with
natural draught. e packing held in position by the recess or rooved and making a
an air-tight joint between the bars and the furnace walls. fflanges cast with the
bars c. 9 studs passing through the flanges f into the furnace walls a to hold the
bars c in position.
Fig. 4 is a transverse section and fig. 5 a plan of a furnace having corrugated
walls a here the side bars c are shaped to fit the corrugations and are formed with
upward extensions to protect the walls from intense heat to a greater extent than the
bars described under figs. 1, 2 and 3. The said bars c are here shown with two
grooves or recesses d d¹ to receive packing and with air ways h. The double packing
gives greater security against the passage of air between the bars and the furnace
walls when a forced draught is used. The air ways h are better omitted if there is a
forced draught.
Fig. 6 is a cross section of a furnace in which the fire bars c have metallic packing
pieces e cast thereon.
Fig. 7 is a cross section of a furnace in which the side bars e have metallic packing
pieces e secured thereto by pins or rivets i. In all the views the same letters denote
equivalent parts.
Any convenient means may be employed to hold the bars c firmly in position and
many devices for that purpose will readily suggest themselves to engineers.
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.
First. In steam boiler and other furnaces the combination with the furnace walls of
fire bars and packing substantially in the manner and for the purpose setforth.
Second. In steam boiler and other furnaces the combination with the furnace walls

page_text: of fire bars having a recess or groove or recesses or grooves and packing substantially
in the manner and for the purposes setforth.
Third. In steam boiler and other furnaces the combination with the furnace walls
of firebars having metallic packing pieces cast thereon or secured thereto substantially
in the manner and for the purposes setforth.
Fourth. In steam boiler and other furnaces the combination with the furnace walls
of fire bars provided with packing and an upward extension substantially in the
manner and for the purposes setforth.
Fifth. In steam boiler and other furnaces the combination of the furnace walls with
fire bars provided with packing and having air ways substantially in the manner and
for the purposes setforth.
Sixth. In steam boiler and other furnaces the combination with the furnace walls
of fire bars provided with packing and securing agents substantially in the manner
and for the purposes setforth.
:
Per pro J. T. KING,
*J. Johnson,
Agent.