Improvements in Collapsible Core Bars for Use in Casting Metal Pipes, Columns, Cylinders or the like.
Year: 1898

page_text: Date of Application, 21st Dec., 1898
Complete Specification Left, 2nd May, 1899-Accepted, 17th June, 1899
PROVISIONAL DIVIFICAR
Improvements in Collapsible Core Bars for Use in Casting Metal Pipes,
Columns, Cylinders or the like.
We, GEORGE WILLIAM CROMPTON, Gentleman, and FREDERICK CHAMBERS,
Assistant Foundry Manager, both of Stanton Iron Works, Stanton by Dale, in
the County of Derby, do hereby declare the nature of this invention to be as
follows:-
It is important that a core bar should be so constructed as to allow of its being
easily withdrawn from the pipe, column, cylinder or like casting, and that the core
bar should whilst passing through the various operations, from the making of
the core to the casting of the pipe, column or cylinder, remain thoroughly rigid
against all the strains to which it may be subjected and also that the interior
of the pipe, column or cylinder, should be truly cylindrical and smooth.
In carrying out our improvements the external portion or shell consists only
of two pieces, one of these portions being a split cylinder having a slot or split
formed through the whole of its length, the second portion being a wedge bar of
a sufficient width to nearly fill the slot, when the core bar is expanded to its
full diameter.
The shell has a number of inclined or wedge shaped parts formed on its inner
surface at suitable distances and positions along each side of the longitudinal
slot, and these wedge or inclined parts lie within the line of internal circumference.
Inside and at each end of the shell, a steel hoop or split annulus is fixed by
rivets or bolts-to the shell.
We prefer that the outside diameter of the hoops, before attaching to the shell,
should be less than the inner diameter of the shell, before the shell is expanded.
This is necessary to give rigidity to the core-bar.
When the core bar is expanded to its full diameter, by fixing the wedge bar
in its proper position, the wedge bar will force out the steel hoops and shell
and thus cause the core bar to be perfectly rigid.
When the wedge bar is placed in its proper position to allow the core bar to
collapse, the tension of the steel hoops and shell will cause the core bar to
collapse sufficiently to allow of its easy withdrawal from the pipe, column or
cylinder casting.
A stop is provided to prevent the wedge bar from being moved beyond its correct
position when the core bar is collapsed.
To expand the core bar, the wedge bar is endwise moved, the wedges forcing the
shell out to the required diameter when expanded. The wedge bar then forming
in conjunction with the shell the exterior and complete diameter of the core bar.
The core bar is then coated with loam direct on to the shell to the required size
for the pipe, column, cylinder or other article.
To collapse the core bar the wedge bar is moved down the incline on brackets
until the stop referred to is in contact with the bracket, the shell and steel hoops
will then have collapsed into their smaller position.

page_text: The core bar is provided with vent holes, and also with the usual hooks or
shackles that are used when lowering the core bar into or withdrawing it from the
mould or casting.
By thus forming the core har, the shell with steel hoops give greatly increased
facility, for the removal of the core bar from the interior of the pipe, column, 5
cylinder or other article that has been cast on it; and the expanding action
of the wedge bar and wedges causes a sufficient tension to be set up in the shell
and steel hoops, so as when expanded to make a perfectly firm and rigid core bar.
Dated the 21st day of December 1898.
WM. BROOKES & SON,
55 and 56, Chancery Lane, London,
Agents for the Applicants.
Improvements in Collapsible Core Bars for Use in Casting Metal Pipes
Columns, Cylinders or the like.
We, GEORGE WILLIAM CROMPTON, Gentleman, and FREDERICK CHAMBERS,
Assistant Foundry Manager, both of Stanton Iron Works, Stanton by Dale, in
the County of Derby, 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;-
;--
It is important that a core bar should be so constructed as to allow of its being
easily withdrawn from the pipe, column, cylinder or like casting, and that the core
bar should whilst passing through the various operations from the making of
the core to the casting of the pipe, column or cylinder remain thoroughly rigid
against all the strains to which it may be subjected, and also that the interior
of the pipe, column or cylinder, should be truly cylindrical and smooth.
In carrying out our improvements the external portion or shell consists only
of two pieces one of these portions being a split cylinder having a slot or split
formed through the whole of its length, the second portion being a wedge bar of
a sufficient width to nearly fill the slot, when the core bar is expanded to its
full diameter.
The shell has a number of inclined or wedge shaped parts formed on its
inner surface at suitable distances and positions along each side of the longitudinal
slot and these wedge or inclined parts lie within the line of internal circumference.
Inside and at each end of the shell, a steel hoop spring closing piece, or split
annulus is fixed by rivets or bolts to the shell.
We prefer that the outside diameter of the hoops before attaching to the shell,
should be less than the inner diameter of the shell before the shell is expanded.
This is necessary to give rigidity to the core-bar.
When the core bar is expanded to its full diameter, by fixing the wedge bar
in its proper position, the wedge bar will force out the steel hoops and shell
and thus cause the core bar to be perfectly rigid.
When the wedge bar is placed in its proper position to allow the core bar to
collapse, the tension of the steel hoops and shell will cause the core bar to
collapse sufficiently to allow of its easy withdrawal from the pipe, column or
cylinder casting.
But in order that our invention and the means of carrying the same into
effect may be the better understood we will by the aid of the accompanying
drawings describe the same more in detail,

page_text: Fig. 1 shows a longitudinal sectional view with the wedge bar in its proper
position for use with the core bar expanded.
Fig. 2 shows an end view looking from the left hand end of Fig. 1 showing
core bar in its expanded position.
Fig. 3 shows a cross sectional view taken on the line 1-1 of Fig. 1 with parts
expanded.
Fig. 4 shows a similar cross sectional view but with the wedge bar in its lowered
position and the parts of the core bar collapsed.
Fig. 5 is an external view of Fig. 1 and shows the wedge bar and wedges
in their proper position when the core bar is expanded as in Fig. 1.
a is the shell, is the wedge bar provided with wedges e, e, c is the slot between
the edges of the core bar (shown collapsed in Fig. 4). d are the steel hoops. The
wedges formed on shell a are shown at f. g, g are the inclines on wedge bar.
h, and are brackets having corresponding inclines. j, j are the end brackets
to support the brackets h, 2, and trunnions i. kis a stop to prevent the wedge
bar from being moved beyond its correct position when the core bar is collapsed
(see Fig. 4).
The bar is forced into its expanding" position by means of blows or pressure
―as by a sledge hammer or swinging bar-applied at the right hand end thereof as
seen in the drawing Fig. 1 and to force it into the collapsing position similar
blows of a sledge hammer or equivalent force is applied to opposite end of that
bar.
To expand the core bar the wedge bar is endwise moved into the positions
shown in Figs. 1, 2, 3 and 5, the wedges e, e, forcing the shell out to the required
diameter when expanded, the wedge bar b, then forming in conjunction with
the shell a, the exterior and complete diameter of the core bar.
The core bar is then coated with loam direct on to the shell to the required size
for the pipe, column, cylinder or other article.
To collapse the core bar the wedge bar bis moved down the inclines on
brackets h, and h³ until the stop k, already referred to, is in contact with the
bracket 2, the shell a and steel hoops d, d, will then have collapsed into their
smaller position shown in Fig. 4, the position of wedge bar 6 when the core bar
is collapsed, being also there shown.
The core bar is provided with vent holes and also with the usual hooks or
shackles that are used when lowering the core bar into or withdrawing it from the
mould or casting.
By thus forming the core bar in the manner described, the shell with the steel
hoops give greatly increased facility for the removal of the core bar from the
interior of the pipe, column, cylinder or other article that has been cast on it, and
the expanding action of the wedge bar and wedges, cause a sufficient tension to be
set up in the shell and steel hoops, so as when expanded to make a perfectly firm
and rigid core bar.
In reference to our said invention and the various means adopted for carrying
the same into practical effect, we would have it understood that we do not
confine ourselves to the precise arrangements of parts herein described and shown
on the accompanying drawings, as the same may be varied without departing from
the peculiar character of our invention, but
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:
for use in casting metal
shell, having steel hoops
have a constant tendency
The construction and use of a core bar,
pipes, cylinders and the like consisting of a
or spring closing pieces so applied that they
to close the split edges of said shell in combination with a wedge bar, wedges

page_text: and parts cooperating therewith to maintain the cylindrical form of the core
bar in use and to admit of ready collapse of the same for withdrawal after use,
substantially as and for the purpose set forth and shown by the drawings.
Dated the 1st day of May 1899
WM. BROOKES & SON,
55 and 56, Chancery Lane, London,
Agents for the Applicants.