Improvements in the Construction of Firebrick Bridges of Furnaces of Boilers and the like..
Year: 1896

page_text: ...Date of Application, 24th Sept., .1896
Complete Specification Left, 14th Apr., 1897-Accepted, 5th June, 1897
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Firebrick Bridges of Furnaces
of Boilers and the like..
I, GEORGE WILLIAM CASS, of 24, Frederick Street, West Hartlepool, Marine
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction of firebrick bridges
of furnaces and has for its object to provide a simple and easy method of placing
the pieces forming the bridge in position and securing the portions together.
In the ordinary construction of these bridges firebricks and clay are used which
cause considerable trouble and waste of time as they have to be left for some time
to dry before the furnaces can be started:
In order to obviate this I propose to make the bridge in two pieces one end of
each being shaped to fit the sides of the furnace and each piece extending about half-
way across.
The joint between the two halves extends from the front to the back at an angle,
the two pieces being bevelled for the purpose of allowing them to be placed in
position easily and quickly..
To secure the said pieces together and in position, I form a recess in the
centre of the top, which is in plan, a rectangle having a rectangular hole of the
same size as a brick extending to the bottom the joint cutting through this at an
angle.
Into this hole or recess is placed a brick, fireclay being employed to close the
joint if found necessary.
Two or more bricks may be employed if needed.
Instead of using bricks to fill this rectangular recess I may unite the pieces
together by means of a special shaped piece of the same width as the other pieces
and having the top curved thus forming a segment of a circle in elevation.
On the under side of this piece is formed a projection, of the same shape and
fitting into this rectangular recess, thereby binding the whole together and
completing the bridge.
The bridge may be made up of many pieces and the top piece may be of any
shape and may have several projections formed on it engaging in recesses in the
lower pieces.
d. any
The joints may also be made square not bevelled, if found desirable, and
shaped recesses and projections may be formed..
This invention does not limit itself to furnaces for boilers, it can also be used as
baffle. bridges in flues and for any other position where ordinary built bridges are
employed for similar purposes.
Dated this 24th September 1896.
GEO. H. RAYNER,'
37, Chaucery Lane, London, Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Firebrick Bridges of Furnaces:
of Boilers and the like.
I, GEORGE WILLIAM CASS, of 24, Frederick Street, West Hartlepool, Marine
Engineer, 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 relates to improvements in the construction of firebrick bridges
of furnaces and has for its object to provide a simple and easy method of placing
the pieces forming the bridge in position and securing the portions together.
In the ordinary construction of these bridges fire bricks and clay are used which
cause considerable trouble and waste of time as they have to be left for some time
to dry before the furnaces can be started.
In order to obviate this by doing away with clay or cement I propose to make
the bridge in two pieces one end of each being shaped to fit the sides of the furnace
and each piece extending about half-way.across.
The joint between the two halves extends from the front to the back at an angle,
the two pieces being bevelled for the purpose of allowing them to be placed in
position easily and quickly.
To secure the said pieces together and in position, I form a récess in the
centre of the top the joint cutting through this at an angle.
Into this hole or recess is placed a brick, fireclay being employed to close the
joint if found necessary. Two or more bricks may be employed if found needed.
Instead of using bricks to fill this rectangular recess I may unite the pieces
together by means of a specially shaped piece having the top curved thus forming
a segment of a circle in elevation.
On the under side of this piece is formed a projection, of the same shape and
fitting into this rectangular recess, thereby binding the whole together and
completing the bridge.
The bridge may be made up of more than two pieces and the top piece may be
of any shape and may have several projections formed on it engaging in recesses
in the lower pieces.
The joints may also be made square and not bevelled, if found desirable and any
shaped recesses and projections may be formed.
This invention does not limit itself to furnaces for boilers, it can also be used as
baffle bridges in flues and for any other position where ordinary built bridges are
employed for similar purposes.
In order that the invention may be more clearly understood reference is had to
the accompanying sheet of drawings in which
Fig. 1 is an elevation of a bridge constructed according to my invention, Fig. 2
is a cross section and Fig. 3 a plan of the same, and
Fig. 4 shows a modified construction in which three bricks are employed.
As shown in Figs. 1, 2, and 3, two bricks A are employed curved at their ends
to fit the furnace crown B and of such a size that when placed together they will
fit closely in the space formed to receive them.
As shown in the plan the ends a are cut at a slight angle so that each piece is
slightly bevelled. When the two bricks are put in place these bevelled ends fit
closely together and prevent the bricks slipping past each other.
To secure the bricks together the connecting piece C is provided the upper
portion of which is curved and the lower part fits in the recess a' in the bricks.
The piece C thus locks the two bricks together at the same time allowing them to
be easily separated by simply removing the connecting piece.

page_text: As shown in Fig. 4 instead of two bricks being employed the bricks A¹ and A' are-
provided A' being of rectangular form and placed between the two end bricks A
which are curved in a similar manner to A. In this arrangement two small.
connecting pieces C¹ may be employed instead of the single piece shown in the
other figures. The arrangement is otherwise similar.
The ends of the blocks or bricks can be milled or cut in any suitable manner so.
that they may be chipped or easily placed in position, or they may be grooved or
pierced to lighten them and to allow air to pass through.
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 :-
(1.) Improvements in fire bridges for furnaces consisting of two or more bricks.
fitting closely in the crown and placed side by side, and a connecting piece or
pieces placed in grooves in the top of the bricks substantially as and for the
purposes specified.
(2.) An improved fire brick bridge for furnaces constructed from two or more.
bricks fitting closely in the crown and against each other, these bricks having
bevelled edges and a groove at the top in which a connecting piece fits securing.
the bricks together substantially as and for the purposes specified.
(3.) The improved fire brick bridge for furnaces formed from a number of
bricks fitting together and a connecting piece placed in grooves in the bricks.
substantially as described and shown and for the purposes specified.
Dated this 14th day of March 1897.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant..