Improvements in and relating to the Casting of Hollow Steel Ingots.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to the Casting of Hollow Steel Ingots.
I, JOHN WOTHERSPOON, of Blairston, Bothwell, in the County of Lanark,
Engineer, do hereby declare the nature of my invention to be as follows:-
This Invention has reference to an improved method of casting hollow steel
ingots for use in the manufacture of solid drawn tubes and the like.
According to my improvements in making a hollow ingot I use a piece of wire
or wire rope for the centre of the core, and cover same with asbestos or other suit-
able heat resisting material.
This composite core is then fixed in the centre of the ingot mould recess by
wedging or otherwise, and the core is then passed through the ingot mould,,and
through a plate on the top or outer end of the ingot mould which keeps the core
in the centre. The core is then drawn tight and held in that condition by means
of a spring and clamp, or their equivalent, such as a weight with a chain passing
over a pulley and fixed to the upper end of core, the object to be attained being to
take up the expansion of the core while the metal is being run into the mould and
thereby keep the core steady and concentric with the ingot mould, the molten steel
being preferably run into the mould through a passage opposite the bottom of the
ingot.
1 1000
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to the Casting of Hollow Steel Ingot
I, JOHN WOTHERSPOON, of Blairston, Bothwell, in the County of Lanark,
Engineer, do hereby declare the nature of my invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement, that is to say:
This Invention has reference to an improved method of casting hollow steel
ingots for use in the manufacture of solid drawn tubes and the like.
The improved method consists in securing a heat resisting wire rope core to
lower end of mould and passing same up the centre and through a top plate in
mould, and in then attaching to core, spring or equivalent devices so as to take up
the expansion of the core while the molten metal is being run into mould.
And in order that my said invention and the manner of carrying same into prac-
tice may be properly understood, I have hereunto appended a sheet of explana-
D

page_text: tory drawings in which Figure 1 represents a sectional elevation of an ingot mould
illustrating my improvements applied thereto, while Figure 2 is a similar view
in which a hanging weight is substituted for the spring in taking up the expan-
sion of the core.
According to my improvements, in making a hollow ingot use a piece of wire
or wire rope a for the centre of the core and cover same with asbestos or other suit-
able heat resisting material.
This composite core is then fixed in the centre of the ingot mould recess a¹
preferably by wedging and the core a is then passed through the ingot mould A
and through a plate A¹ on the top outer end of the ingot mould A which keeps
the core a in the centre. The core a is then drawn tight and held in that condi-
tion by means of a spring band clamps b¹ or their equivalent, such as a weight c
with a chain c¹ passing over a pulley 2 and fixed to the upper end of core a the
object to be attained being to take up the expansion of the core a while the metal
is being run into the mould and thereby keep the core a steady and concentric
with the ingot mould A the molten steel being preferably run into the mould A
through a passage A2 opposite the bottom of the ingot.
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. The method of casting hollow steel ingots consisting of a heat resisting
core secured to lower end and passed through the centre of ingot mould and held
tight by tension devices, so as to take up the expansion of the core while the molten
metal is being run into the mould, substantially as set forth.
Second. In casting hollow steel ingots within a mould the combination com-
prising a wire rope core coated with heat-resisting material, a plate at top of
mould for keeping the core in the centre, and spring or equivalent devices for
taking up the expansion of the core while the metal is being run into the mould,
substantially as set forth.
Dated the 9th August 1897.