Improvements in the Method of and in Apparatus for Moulding and Casting Fire Bars.
Year: 1885

page_text: Improvements in the Method of and in Apparatus for Moulding
and Casting Fire Bars.
We JAMES SCHOFIELD of the Town House Mill Littleborough in the County of
Lancaster Cotton Spinner and GEORGE GRAHAM of the same place Foundry
Manager, do hereby declare the nature of the said invention for "IMPROVEMENTS
IN THE METHOD OF AND IN APPARATUS FOR MOULDING AND CASTING FIRE BARS"
to be as follows:-
Our Invention relates to the moulding and casting of the fire bars used in
furnaces and more particularly to the production of such bars with chilled faces
the object of our Invention being to expedite the operation. In the moulding
operation we employ means for withdrawing the pattern downward. The pattern
is fixed to carriers which slide vertically and are actuated simultaneously so that
the parallelism of the pattern in its movements is retained. The said carriers are
connected by means of links with cranks or excentrics which are upon a shaft
which is fitted to be revolved and is provided with a hand wheel and handle or is
actuated by means of suitable gearing. The construction may be varied by using
only a single sliding carriage or by substituting racks and pinions or screws for
the cranks or excentrics. In the table of the machine is formed an opening which
is shaped to suit the pattern so that when the latter is raised to its upper position
the said opening is just closed. In the moulding operation simple top boxes are
used these boxes being prepared to engage with the table so that each box is at
once placed in and maintained in its correct position. For this purpose studs
fixed in the table may enter holes in the flange of the box. When the pattern is
in the upper position a box which has been placed upon the table is rammed up.
The pattern is now withdrawn downward through the opening in the table by
turning the shaft. which gives motion to the said pattern carriers. The pattern can
by this method be withdrawn from the mould more quickly and with less damage
to the mould than when the pattern is withdrawn by hand. The box is then
lifted off the table and is placed upon a chill block and the casting proceeds in the
[Pmini

page_text: usual manner. We prefer to mould the bars singly in narrow boxes and to place
each box upon a separate chill but we do not confine ourselves to this. The chill
is prepared to fit the box as in the case of the table and if the face of the bar is to
be channeled the chill is made of a form which will impart the desired shape to the
face of the bar.
בד
1
0011 1
C Tommi 100K
Improvements in the Method of and in Apparatus for Moulding
and Casting Fire Bars.
We JAMES SCHOFIELD of the Town House Mill Littleborough in the County of
Lancaster Cotton Spinner and GEORGE GRAHAM of the same place Foundry
Manager do hereby declare the nature of our invention for "IMPROVEMENTS IN
THE METHOD OF AND IN APPARATUS FOR MOULDING AND CASTING FIRE BARS
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement and accompanying Drawings :-
"
Our Invention relates to the moulding and casting of the fire bars used in
furnaces and more particularly to the production of such bars with chilled faces the
object of our Invention being to expedite the operations.
The accompanying drawings illustrate the apparatus which we employ in
carrying our invention into effect. Figs. 1 and 2 of the said drawings are vertical
cross sections and Figs. 3 and 4 vertical longitudinal sections of the moulding
machine. Figs. 1 and 3 represent the pattern in the mould or flask and Figs. 2
and 4 show the pattern withdrawn from the mould. The parts are supported in a
suitable frame a. which carries a shaft b. capable of being turned in its bearings by
a hand wheel c. Upon the shaft bare two cams, or excentrics d. which are
arranged to engage with feet c. on the spindles or links f. which slide in fixed
brackets g. and which carry the pattern fire bar h. The upper tabular part i. of
the frame a has an opening p which fits the pattern h. and allows it to pass
through, the opening being just closed when the pattern is in its raised position.
A moulding box or flask k. is placed on the table 2. and held in position by means
of studs . which pass through holes in the flange of the flask k. The mode of
carrying my invention into effect is as follows. The moulding flask k is placed in
position on the table i and the shaft b. is turned so as to raise the pattern h. into its
upper position in the flask k. The said flask is then rammed up with sand as
represented in Figs. 1 and 3. The hand wheel c. is then turned so as to withdraw

page_text: the pattern downward from the sand in the moulding box as shown at Figs. 2
and 4.. The moulding flask k. is then removed and placed upon a chill block m as
shown at Fig. 5 and the casting proceeds in the usual manner. When it is desired
to form a channel in the face of the bar the chill is formed with a projection o. as
shown, which will impart the desired shape to the face of the bar. The herein-
before described construction of apparatus may be varied by using only a single
sliding carriage or by substituting cranks or racks and pinions or screws for the
cams or excentrics d. We prefer to mould the bars singly in narrow boxes and
to place each box upon a separate chill but we do not confine ourselves to this.
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 claim is
1. In moulding fire-bars withdrawing the pattern from the sand in the moulding
box by means of apparatus arranged, constructed and operated in the manner or
substantially as hereinbefore described and shown.
2. Casting fire-bars on chills substantially as described and shown.