IMPROVEMENTS IN CORE BARRELS
Year: 1877

page_text: LETTERS PATENT to Charles Denton Abel, of Southampton Buildings, in the
County of Middlesex, for the Invention of "IMPROVEMENTS IN CORE BARRELS."
A communication from abroad by William Henry Knight and George Bisset,
junior, both of Quebec, in the Dominion of Canada.
Sealed the 26th February 1878, and dated the 20th September 1877.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 20th September 1877.
CHARLES DENTON ABEL, of Southampton Buildings, in the County of Middlesex.
"IMPROVEMENTS IN CORE BARRELS." [A communication from abroad by William
Henry Knight and George Bisset, junior, both of Quebec, in the Dominion of
Canada]
This Invention relates to an improved construction of that arrangement of core
barrels for casting pipes, tubes, cylinders, and the like, wherein the barrel, after the
casting has been made, can be collapsed so as to be readily removed from the
casting.
According to the present Invention the barrel is formed of four segmental pieces,
constructed in pairs, the members of each pair being identical in configuration and
directly opposite each other. The edges of the one pair are tapered off in thickness
on the inner side, and overlap those of the other pair to a certain extent. To the
inner face of each segment near each end is secured an arm extending inwards,
passing through holes in cylindrical or polygonal diaphragms, and terminating in
a head with a wedge-shaped or conical surface, which bears upon a corresponding
wedge-shaped or conical surface formed on sleeves that can slide in holes in the
before-mentioned diaphragms, and that have a rod passing through them. This rod
is square or polygonal at the part where it passes through the sleeves, so that it
cannot rotate; at one end it has a head or nut that bears against the outer end of
the one sleeve, while at the other end it is formed cylindrical and has a screw thread
cut upon it, on which is a screw collar that can be rotated by means of a handle.
Price 671

page_text: Thus by turning the said collar it is screwed up against the outer end of the second
sleeve, and by the continued rotation of the collar the two sleeves are drawn
together, thus causing their conical surfaces to force outwards the arms bearing
upon them, whereby the segments of the barrel are expanded. The loam core is
then formed and dried on the barrel while in this expanded condition, and after the 5
casting has been formed thereon the screw collar is turned so as to recede from the
sleeves, whereupon these slide outwards in consequence of the pressure of the arms
on their conical surfaces, and the segments of the barrel collapse into their original
position.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Dentou Abel in the Great Seal Patent Office on the 20th
March 1878.
CHARLES DENTON ABEL, of Southampton Buildings, in the County of Middlesex.
"IMPROVEMENTS IN CORE BARRELS." A communication from abroad by William
Henry Knight and George Bisset, junior, both of Quebec, in the Dominion of
Canada.
This Invention relates to an improved construction of that arrangement of core
barrels for casting pipes, tubes, cylinders, and the like, wherein the barrel, after the
casting has been made, can be collapsed so as to be readily removed from the
casting.
According to the present Invention the barrel is formed of four segmental pieces,
constructed in pairs, the members of each pair being identical in configuration and
directly opposite each other. The edges of the one pair are tapered off in thickness
on the inner side, and overlap those of the other pair to a certain extent. To the
inner face of each segment near each end is secured an arm extending inwards,
passing through holes in cylindrical or polygonal diaphragms, and terminating in a
head with a wedge-shaped or conical surface, which bears upon a corresponding
wedge-shaped or conical surface formed on sleeves that can slide in holes in the
before-mentioned diaphragms, and that have a rod passing through them. This rod
is square or polygonal at the part where it passes through the sleeves, so that it
cannot rotate; at one end it has a head or nut that bears against the outer end of
the one sleeve, while at the other end it is formed cylindrical and has a screw thread
cut upon it, on which is a screw collar that can be rotated by means of a handle.
Thus by turning the said collar it is screwed up against the outer end of the second
sleeve, and by the continued rotation of the collar the two sleeves are drawn
together, thus causing their conical surfaces to force outwards the arms bearing
upon them, whereby the segments of the barrel are expanded. The loam core is
then formed and dried on the barrel while in this expanded condition, and after the
casting has been formed thereon the screw collar is turned so as to recede from the
sleeves, whereupon these slide outwards in consequence of the pressure of the arms
on their conical surfaces, and the segments of the barrel collapse into their original
position.

page_text: DESCRIPTION OF THE DRAWINGS.
Fig. 1 represents a longitudinal section, and Fig. 2 a transverse section of an
expanding core barrel, according to this Invention, such as may be employed in the
casting of socket pipes.
The barrel is made in four segments L, those of the one pair overlapping the
edges of those of the other pair. K is a rod, square or polygonal, on which are
fitted to slide two sleeves H having inclined projections h. Arms Rattached to the
segments L have sloped heads which bear against the projections h, and these arms
are guided so as to move radially through holes in cylindrical diaphragms M. The
sleeves H bear against nuts X and Y which are screwed on the ends of the rod K.
Either of these nuts, as X, is provided with a winch handle N, by which it can be
screwed up or unscrewed. When it is screwed up the sleeves H are caused to move
towards each other, and their sloped faces a, acting on the arms R, push them
outwards, thereby expanding the segments L of the barrel. On unscrewing the
nut X the sleeves H are left free to recede from one another, and the segments L of
the barrel can then shrink inwards, the arms R pushing the sleeves apart. The
barrel may be obviously divided into a number of segments exceeding four, and the
projections h of the sleeves H and the heads of the arms R may be made with
conical or approximately conical bearing surfaces.
Having thus described the nature of this Invention, and in what manner the
same is to be performed, as communicated to me by my foreign correspondents, I
claim the construction of collapsible core barrel, consisting of overlapping cylindrical
segments supported by radial arms, which slide through holes in diaphragms, and
bear by their aloping heads on the inclined faces of sleeves that are fitted to slide
on a central rod, substantially as herein described.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Nineteenth day of March, in the year of our Lord One
thousand eight hundred and seventy-eight.
CHAº. D. ABEL. (L.B.)