IMPROVEMENTS IN THE CONSTRUCTION OF OR FITTING TOGETHER OF STRUCTURES OF CAST IRON
Year: 1879

page_text: LETTERS PATENT to John Alexander Brodie, Ironfounder, and David Jack,
Foreman, both of Leith, in the County of Midlothian, North Britain, for the
Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF OR FITTING TOGETHER
OF STRUCTURES OF CAST IRON."
Sealed the 31st October 1879, and dated the 8th May 1879.
PROVISIONAL SPECIFICATION left by the said John Alexander Brodie and
David Jack at the Office of the Commissioners of Patents on the 8th May
1879.
JOHN ALEXANDER BRODIE, Ironfounder, and DAVID JACK, Foreman, both of
Leith, in the County of Midlothian, North Britain. "IMPROVEMENTS IN THE
CONSTRUCTION OF OR FITTING TOGETHER OF STRUCTURES OF CAST IRON."
This Invention, which relates to improvements in the construction of or fitting
together of structures of cast iron, has for its objects to avoid the necessity for and
cost of drilling holes in snugs or analogous fastenings by which the parts of cast iron
structures are jointed together, and tapping or forming screw threads in those parts
thereof into which the screws for uniting the said parts are passed. Another
object of the Invention is to enable a stronger screw thread, that is to say, a screw
thread formed in malleable metal in place of in cast metal, to be adopted.
The Invention consists in placing in the proper positions in the moulds in which
the castings are made screw nuts, or tapped pieces of malleable iron, or other
tenacious metal of a similar nature, around which the metal, when it is run into the
mould, closes and unites the said nuts or tapped pieces in the smugs or other parts
of the fastenings, and the screws which are used for fastening the parts of the cast
iron structure together are passed through these nuts or tapped pieces of malleable
iron or other metal. The screws may be tapped in the pieces of malleable iron or
other metal, either before or after the castings are made.
The Invention is especially applicable to the fastening together of the parts of
fire grates, cooking ranges, and similar structures, but it may also be applied to the
fastening together of the parts of such other cast iron structures as it is or may be
applicable to.

page_text: "
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Alexander Brodie and David Jack in the Great Seal Patent
Office on the 8th November 1879.
JOHN ALEXANDER BRODIE, Ironfounder, and DAVID JACK, Foreman, both of
Leith, in the County of Midlothian, North Britain. “IMPROVEMENTS IN THE
CONSTRUCTION OF OR FITTING TOGETHER OF STRUCTURES OF CAST IRON."
Our said Invention relates to improvements in the construction of or fitting
together of structures of cast iron, and has for its objects to avoid the necessity for
and cost of drilling or tapping holes or screw threads for the reception of fastening
screws in snugs or the like, by which the parts of cast iron structures are joined
together, and enabling a stronger screw thread to be employed, that is to say, a screw
thread formed in malleable metal in place of in cast metal.
According to our said Invention scrow-nuts or tapped pieces of malleable iron or
other tenacious metal of a similar nature are placed in the moulds in which the
castings of the structure are made in the proper position, so that when the metal is
run into the moulds it closes around and unites the said nuts or tapped pieces in
the sougs or other parts of the castings, and the screws which are used for fastening
the parts of the cast iron structure together are passed through these nuts or tapped
pieces of malleable iron or other like metal, as illustrated in transverse section and
plan of underside respectively, in Figures 1 and 2 of the accompanying Drawings,
where a represents one part of a cast iron structure to be joined to another part b.
The nut c of malleable metal with a screwed hole therein in placed in the mould in
which the part 6 of the structure is cast as aforesaid in proper position, so that it
will occupy the place where the fastening of the finished casting is to be effected,
and into this nut c the screw d used for connecting the parts together is passed in
forming a structure. The hole in the part a of the structure may be cast or drilled
in the ordinary manner.
We will now proceed to describe a method by which the nut c may be cast in
the casting. A core box, shewn in front elevation in Figure 3, is prepared, having
an opening e through it smaller than the nut o, and having a central recess ƒ of the
size of the said nut c, as shewn more clearly in Figure 4, which represents a plan
of the lower half of the core box. The nut c is placed in the core box and sand
rammed thereinto so that a core is formed of the nut and sand of the form shewn
in Figure 5. Upon a part of the pattern 9, Figure 6, of the snug or other part of
the casting into which the nut c is to be cast are prints h, which, in moulding, leave
recesses in the mould for the reception of the core, Figure 5. A portion of the mould
when finished is represented in Figure 7, the metal when being cast thereinto running
around the nut c without obstructing the screw thread thereof, but so that the cast
metal partially encloses the said nut. The nut c may be of the same thickness as
the metal in which it is cast, if desired, and may have a groove around its edge for
the cast metal to enter and retain it securely. The screws or holes may be tapped
in the pieces of malleable or tenacious metal, either before or after the castings are
made.
The Invention is especially applicable to the fastening together of the parts of
fire grates, cooking ranges, and similar structures, but it may also be applied to the
fastening together of the parts of such other cast iron structures as it is or may be
applicable to.
Having now described the nature of our Invention, and the system, mode, or
manner in or under which the same is or may be performed or practically carried
into effect, we would observe in conclusion that what we consider to be novel and
original, and therefore claim as the Invention secured to us by the hereinbefore in
part recited Letters Patent is,―
The improvements in the construction of or fitting together of structures of cast

page_text: iron, consisting in inserting in the parts of such structures, at the places which
receive the fastening screws, nuts, or pieces of malleable iron, or other tenacious
metal of a similar nature, in which are formed or tapped the female screws or holes
to receive the fastening screws, essentially as herein before described.
In witness whereof, we, the said John Alexander Brodie and David Jack,
have hereunto set our hands and seals, this Third day of November, in
the year of our Lord One thousand eight hundred and seventy nine.