Improvements in Bosh Plates for Furnaces.
Year: 1891

page_text: Date of Application, 2nd Dec., 1891
Complete Specification Left, 18th Jan., 1892-Accepted, 20th Feb, 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JAMES GAYLEY, Metallurgical Engineer, of
Braddock, in the County of Allegheny and State of Pennsylvania, United
States of America].
Improvements in Bosh Plates for Furnaces.
1 JAMES JOHNSON of 4 Clayton Square Liverpool in the County of
Lancaster, Patent Agent do hereby declare the nature of this invention to be as
follows:-
In the bosh plate now commonly in use, two small separate, water courses are
employed, and when the inner course is injured it is customary to close the water
communication and allow it to burn off, using ouly the outer course. This involves
a great loss of metal, and consequently, as these plates are made of bronze, a
considerable expense.
In my improved construction these difficulties are obviated and a bosh plate is
employed which contains a single water course of large capacity and of such shape
that the walls may be easily repaired. Moreover no special bricks are required in
building the plates in the furnace walls, and the shape and the continuity of the
walls may remain unaltered.
Each bosh plate is made tapering in width and thickness, producing a wedge
shaped plate and is provided at its inner side with a water chamber having inlet
and exit pipes. Between these pipes is an air chamber open at its outer side and
having supporting ribs which form chambers communicating with each other by
apertures. If desired, studs may be used in place of the partitions, but I prefer
the construction shown. This chamber does not extend to the outer ends of the
pipes, but an offset is provided in which loose bricks may be inserted to preserve
the continuity of the walls, leaving only the pipes protruding therefrom.
No baffle-plates or partitions are employed in the chamber, the top plate being
supported by a series of small studs or posts. This constitutes an important item
of my invention, since deposits constantly form on the baffles commonly used,
clogging up the passages and preventing the flow of the cooling fluid. In building
the plates into the furnace wall, the top surface is preferably made horizontal, the
entire taper coming on the bottom of the plate on account of ease in construction,
the use of special forms of bricks being thus avoided.
COMPLETE SPECIFICATION.
Improvements in Bosh Plates for Furnaces.
I, JAMES JOHNSON of 4 Clayton Square Liverpool in the County of
Lancaster, Patent Agent 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 :-
In the bosh plate now commonly in use two small separate water courses are
employed, and when the inner course is injured, it is customary to close the water
communication and allow it to burn off using only the outer course. This involves
a great loss of metal and-consequently-as these plates are made of bronze,—a
considerable expense.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation partly in vertical section showing a blast furnace
. provided with my improved bosh plate.
.
Figure 2 is a horizontal sectional view of a single bosh plate on the line II-II
of Figure 5.
Figure 3 is a section on the line III-III of Figure 2.
Figure 4 is an end view; and,
Figure 5 is a front view, respectively of the bosh plate of Figure 2.
In the drawings, 2 represents the wall of a furnace, and 3, 3, the bosh-plates
arranged preferably in several horizontal series around the furnace bosh. Each
bosh-plate is made tapering in width and thickness, as shown in Figures 2 and 3,
producing a wedge shaped plate, and is provided at its inner side with a water-
chamber 4, having the inlet pipe 5 and exit-pipe 6. Between these pipes is an air
chamber 7 open at its outer side and having supporting ribs 8 which form chambers
communicating with each other by apertures 9. If desired, studs may be used in
place of the partitions but I prefer the construction shown. This chamber does
not extend to the outer ends of the pipes 5 and 6, but an offset 10, is provided in
which loose bricks may be inserted to preserve the continuity of the walls, leaving
only the pipes 5 and 6 protruding therefrom. In Figure 1, the series 11 is shown
without the filling bricks, while series No. 12 illustrates the bricks in place.
It will be seen from Figures 2 and 3 that no baffle plates or partitions are
employed in the chamber the top plate being supported by a series of small studs
or ports 13. This constitutes an important item of my invention, since deposits
constantly form on the baffle commonly used, clogging up the passages aud
preventing the flow of the cooling fluid. In building the plates into the furnace-
wall, the top surface is preferably made horizontal, the entire taper coming on the
bottom of the plate on account of case in construction, the use of special forms of
bricks being thus avoided.
A practical test of these plates has shown that they possess remarkable cooling
power and stability in resisting pressure while the condition of each plate is easily
ascertained by inspection of the air-chamber 7, and any leak easily located and
repaired.
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:
First. A cooling-plate having a plane-surfaced inclined top and bottom; sub-
stantially as described.
Second. A cooling-plate having a plane-surfaced inclined top and bottom, and
openings for a cooling medium; substantially as described.
Third. A cooling-plate containing a single closed and unobstructed water
chamber, pipes of smaller diameter leading thereto, and vertical studs in the water
chamber; substantially as described.
Fourth. A bosh plate having an inner water chamber, an outer chamber open to
the air, and partitions in said air chamber, forming cavities therein; substantially
as described.
Fifth. A bosh plate having an inner water chamber, a pipe extending from each
end of said chamber, an air chamber between and shorter than said pipes, producing
an offset between the pipes; substantially as described,

page_text: Sixth. The combination with the bosh wall of a blast furnace, of bosh-plates
located therein, the upper surface of said plates being horizontal, while the lower
surface is inclined inwardly; substantially as described.
Dated the 16th day of January 1802
J. JOHNSON.