IMPROVEMENTS IN CORE-BARS
Year: 1885

page_text: COMPLETE SPECIFICATION
"
I HENRY HARRIS LAKE, of the firm of Haseltine, Lake and Co, Patent Agents.
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTS IN CORE-BARS 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 what are termed collapsible core-bars such as are used
in the manufacture of cast pipes and similar castings
In the accompanying drawing
Figure 1 is a view in perspective of a core-bar constructed according to this
invention
Figure 2 is a longitudinal section of the core-bar
Figure 3 18 an endview of the same
Figure 4 is a cross-section on the line 4-4 Figure 2.
Figure 5 18 a cross-section on the line 5-5 Figure 2
Figure 6 is a view of a detail, and,
Figure 7 is an elevation, from within the shell of the core-bar, of one of the
devices employed in holding the movable parts of the shell together
Similar letters of reference denote the same parts in all the figures
A represents the improved core-bar The cylindrical surface to which the clay
is applied consists of the shell a and the strip B The shell a is preferably com-
posed of the parts a¹al and the part a³, the part a being attached by means of
the brackets aa³, to the shaft a, and the parts a' a' being hinged, at a³ a³, to the
part a²,
The strip B is of wood or other cheap, readily combustible, or readily frangible
material, and suited for insertion between the opposing edges as a of the parts a' a²,
respectively, and substantially as shown in Figure 1, and, when thus inserted, the
strip forms, in connection with the shell a, a continuous cylinder
In forming the core-bar the shell is expanded-say by springing it-sufficiently
to admit the strip B, and the strip is preferably secured in its place between the
edges aº aª by grooving the latter and shaping the strip at its edges, to fit the
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page_text: grooves If desired, the edges of the strip may be grooved and the edges as a of
the shell provided with tenons to fit into the grooves in the strip I do not,
however, wish to be confined to any particular mode of securing the strip in its
place between the edges as aº, nor do I wish to rely, in holding the strip, upon the
contractile force exerted by the shell a upon the edges of the strip, although it
may be desirable in practice to so construct the shell a as to enable it to contract
upon and bind the strips after it has been inserted between the edges at a
A desirable means for holding the edges against the strip is shown in the
drawing, the parts a¹al are respectively provided with the lugs a a³, a tie, a³,
having a head a at one end and a slot a at the other, is placed in the lugs
(which are fitted to receive the tie) and by means of a key a, which is driven
into the slot and against the adjacent lug, as shown in Figure 7, the edges a® aº
are drawn and held against the strip When the strip is of wood it 18, in practice
made in sections bb, Figure 1, and with the grain of the wood at right angles to
the longitudinal axis of the core-bar This obviates the trouble arising from the
shrinkage of the wood when its grain is parallel with the longitudinal axis of the
core-bar
To keep the shell from springing out of shape the parts a¹ a¹ are preferably tied
to the centre of the core-bar by means of the chains a¹ a¹ The core-bar, after
the strip B is inserted in the shell a, is completed in the ordinary manner as
indicated in Figure 4, in which C represents the clay-coating, and D, the pipe
In using the core-bar the heat incident to the casting of the metal operates to
char the strip B sufficiently to enable it to readily drop from its position in the
core-bar whereupon the parts a¹ a¹ are free to turn on their hinges and close
together, or toward each other, so as to enable the core-bar to be readily detached
from the casting In thus closing the parts a¹ a¹ the ties a³ may be detached fiom
the lugs
When the core-bar is to be used again in forming another core another
strip B is inserted between the edges aº aª as before, that is, a new strip B is used
everytime a core is formed
In the core-bars of large size, say for pipes of 12" and upward, the hinges may
be dispensed with, and the parts a¹ a¹ a³ may be a single piece, as it can then be
sprung open sufficiently to admit the strip B
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent I declare that what I claim is
First The combination of the shell a and the strip B, as described
Second A core-bar shell a having edges aº aª, in combination with the strip B
for the purpose described
Thud The combination of the shell a, the strip B, and the ties a³, as described
Fourth The combination of the shaft at, the brackets a³, the parts a¹a¹, the
part a, and the strip B, as described
Fifth The combination of the shaft a', the brackets a³, the parts a¹ a¹ a³ the
strip B, and the chains a¹, as described