IMPROVEMENTS IN CORE BARS FOR USE IN CASTING METAL PIPES OR CYLINDERS
Year: 1884

page_text: I JAMES CHAMBERS of the Stanton Iron Works near Nottingham in the County
of Derby Foundry Manager do hereby declare the nature of my invention for
IMPROVEMENTS IN CORE BARS FOR USE IN CASTING METAL PIPES OR CYLINDERS
to be as follows :-
The object of my invention is to afford means of readily reducing the size of
core bars used in forming cores for moulds for the casting of metal pipes or
cylinders and more especially adapted for the preparation of cores for moulds for
the casting of metal pipes or cylinders of small diameter.
Great difficulty has hitherto been found to attend the use of chollow core bars
capable of collapsing or being reduced in size for removal, when small sizes of tubes
or pipes are being produced and attempts in that direction have not so far as I can
learn been successful in practice and my invention will be found particularly useful
in this respect as well as in the production of cores of larger sizes.
In carrying out my invention the cylinder or shell of the core is according to one
modification formed in two segments or parts, forming lengthwise two divisions of
the shell which two segments or parts of the shell are arranged for use one on each
side of a central piece formed of two plane surfaces inclining to one another at one
end so as to form a wedge and this wedge when caused to move in the one
direction will distend the two segments from each other and when drawn in the
opposite direction will admit of the closing in again towards one another relation
of the parts within the limits of contraction and expansion is preserved by rods
or bolts and nuts passing into grooves and recesses or openings in the parts
respectively.
In order to prevent the rods or bars connecting the wedge piece with the
segments from taking the weight of those segments in removing them from the
mould for small sizes I provide blocks or projections upon the two segments or
part cylinders adapted to engage with other blocks or projections from the wedge
piece so that when the wedge piece has completed its traverse in withdrawal, in
order to the collapsing of the parts or segments the projections thereon engage
those of the segments and sustain them and for large sizes of pipes or cylinders
Price 6d1

page_text: I employ link connections to lugs on the segments and wedge piece respectively
which connections also serve to aid in effecting the contraction of the segments for
withdrawal of the core bar.
To reduce friction the sliding surfaces or faces of the segments on the wedge piece
or double inclined plane are cut away or recessed at intervals.
Projections at intervals on the wedge piece serve to keep the segments in proper
relative position.
The sand or core mould is applied and the parts are employed in practice in
manner as will be readily understood by those conversant with this class of
manufacture.
According to another modification I form the core bar in four segments the two
side segments being hinged together.
The operation of the wedge piece for release of the segments in order to permit
their collapsing may take either an upward or downward or other direction.
רתו.
1
1004

page_text: I JAMES CHAMBERS of the Stanton Iron Works near Nottingham in the County
of Derby Foundry Manager do hereby declare the nature of my invention for
"IMPROVEMENTS IN CORE BARS FOR USE IN CASTING METAL PIPES OR CYLINDERS
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
The object of my invention is to afford means for readily and efficiently reducing
the size of core bars used in forming cores for moulds for the casting of metal pipes
or cylinders and more especially adapted for the preparation of cores for moulds for
the casting of metal pipes or cylinders of small diameters..
Great difficulty has hitherto been found to attend the use of hollow core bars
capable of collapsing or being reduced in size for removal, when small sizes of tubes
or pipes are being produced and attempts in that direction have not so far as I am
aware been successful in practice and my invention will be found particularly useful
in this respect, as well as in the production of cores of larger sizes.
In carrying out my invention the cylinder or shell of the core is, according to one
modification of my invention formed in segments or parts constituting lengthwise
divisions of the shell, which segments, parts or divisions are arranged relatively for
use, one on each side of a central piece formed with two plane surfaces inclining
correspondingly with the corresponding edges of the segmental divisions of the shell,
whereby this central piece acts as a wedge and so as to wedge or press apart in the
one direction or laterally these segments or divisions of the shell when the central
piece is caused to move longitudinally in one direction, and then when the central
piece is moved in the reverse longitudinal direction the inclined planes or wedge
piece is withdrawn into the core shell, admitting of the segments or divisions closing
in towards or nearer to each other: this will however be better understood by
reference to the Drawings in which Figure 1 and 14 shew two portions of a core
bar arranged in this manner (one of the simplest forms of the invention) partly in
section taken longitudinally with the wedge upwards in two positions in Figure 1.
raised and in Figure 14 lowered whilst Figures 2 and 24 indicate like views taken
at about right angles to Figures 1 and 1ª Figure 3 shows a cross section at about the
line 1. 1 of Figure 1. Figure 4 shows an end view of Figure 14 and Figure 5 an
opposite end view of Figure 1. Figure 6 shows a slight modification of the fore-
going having straight parallel links in place of splayed links particularly adapted
for larger sizes, this view being drawn of a larger scale than the preceding views.
a indicates one segment or division and a² another division, connected at a a² to
another piece at. The extent of separation of the parts a, a¹ by the pressure of the
piece b of wedge shape is controlled by the nuts heads or enlargements c² to the
cross pins c carried in the holes a³ ³ of the segmental pieces a, a¹, and forming
the axes of the arms or links d d centred to the piece b and upon which links d
that piece b is supported and guided parallely as it is caused to rise and lower as it
is drawn or forced in one or the other direction by the operation of the wedge

page_text: locked projection 6¹, in retaining the wedge b so as to distend the segments a a¹ or
when unlocked permitting the wedge to recede and the parts a, a³, to collapse and
fall towards a central line. The end parts f. f. afford bearings or supports for the
axes g g of the core bar.
In place of the links d d being centred or arranged to swing on the cross pins c
these links d d may be centred upon or linked to the bottom piece or segment a* as
indicated by Figures 7 and 8 at a*.
Relation of the parts within the limits of contraction and expansion is, where
such aids are desired further preserved by means of an increased number of rods or
bolts and nuts passing into grooves and recesses or openings in the parts
respectively, and for large sizes of pipes or cylinders I adapt the links connecting.
the wedge piece to the cross pius rods or bars so as also to aid in effect the con-
traction of the segments or divisions for withdrawal of the core bar. 6¹ is an eye
or projection through which a key or pin b² may be passed and serve to hold the
part 6 in its outward position.
To reduce friction the sliding surfaces or faces of the segments on the wedge
piece or double inclined plane are cut away or recessed at intervals.
The operation of the wedge piece for release of the segments in order to permit
of their collapsing may take either an upward or downward motion.
The sand or core mould is applied and the parts are employed in practice in
manner readily understood by those conversant with this class of manufacture and
not requiring further explanation.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I declare that what
I claim is
c
The arrangements or construction of expansible and contractible core bar for use
in casting metal pipes or cylinders substantially as set forth.
Dated this 8th day of May 1885.
W
55 & 56, Chancery Lane, London,
Agents for the said. James Chambers.
BROOKES & SON,