Year: 1888

page_text: Date of Application, 27th Mar., 1888
Specification Accepted, 18th May, 1888
We, PATRICK ROBERT GREENE and JOHN CLAFFY, of Brooklyn, County of Kings,
State of New York, and PETER BYRNE, of Jersey City, Hudson County, State of
New Jersey, all citizens of the United States of America, Engineers, 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:-
This invention relates to an improved sectional core for making earthenware or
other tubes, the invention being particularly applicable for making cement conduits
for underground wires. The invention may however also be used for forming tubes
out of other materials. The core is composed of an annular shell, divided into three
or more parts by longitudinal cuts, and of a central support or prop around which the
shell is placed. After the molding or casting of the tube, the central prop is with-
drawn, whereupon the sectional shell will collapse and may be readily removed.
The invention consists in the various features of improvements more fully pointed
out in the claim.
In the accompanying drawing; Fig. 1 is a top view of the core complete. Fig. 2 is
a cross section on line x, x, fig. 1.
Figs. 3, 4 and 5 are detail views of the parts b, c, and d, respectively.
The letter a represents a central plug, prop or other support made of wood or other
material. Around this prop there is placed a sectional core or shell, which, when
properly put together, is of annular shape, or of such other shape as the bore of the
tube is to have.
This core or shell is preferably made of three pieces b, c, & d, though it may be
made of more pieces. The pieces 6 and d are alike and have each a straight edge and
a slanting or cutaway edge. Between these slanting edges of the pieces b, d, the
third piece c, is introduced. This piece is wedge shaped, that is, it is made with con-
verging edges and together with the pieces b, d, completes the shell or core. The
slanting edges of the pieces b, d, are beveled inwardly and the two edges of the
wedge c, are beveled outwardly, so that when the central prop is withdrawn, the
wedge will have a tendency to drop inward, thus causing a collapse of the shell. We
prefer to make the wedge c somewhat longer than the pieces b, d, so that it projects
with its contracted end beyond the ends of such pieces.
Co

page_text: The operation of the device is as follows:
The shell being snugly fitted around the prop a, makes a complete solid core around
which the tube is formed in suitable manner. Then the prop is withdrawn. To
overcome any adhesion of the shell to the work, the wedge c is pushed inwards at
its exposed end, thus opening the joints between the wedge and the side pieces and
causing a complete collapse of the shell, the separate pieces of which may then be
withdrawn. The beveled edges of the side pieces and of the wedge, will materially aid
in this collapse.
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 :
1. The combination of central prop a, with sectional shell b, c, d, of which the
sections b, d, have each a slanting and inwardly bevelled edge, and the section c is
made with converging edges and has both edges beveled outwardly substantially as
specified.
2. The combination of central prop a, with slanting sections b, d, and wedge
shaped section c, projecting beyond sections b, d, substantially as specified.
HERBERT J. ALLISON,
Agent for the Applicants.