Improvements in Moulds for Forming Wood or other Pulp into Hollow Cylinders.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Moulds for Forming Wood or other Pulp into
Hollow Cylinders.
I RICHARD HENRY BRUNTON Civil Engineer 3 Gipsy Road West Norwood,
London, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to make from wood or other pulp hollow cylinders
which may afterwards form the sides of barrels, canisters, pails, cases for containing
shot or lead powder now used for testing the mountings of ordnance and for other
purposes.
I employ a core which will form the inside of the pressed cylinder. Its outside
is formed by a cylindrical die divided sectionally into four quadrants extending in
length along the whole of the cylinder to be pressed. The sides of each of those
quadrants extend backwards parallel one to the other at an angle of 45°, but the
two upper ones are gradually curved upwards and the two lower ones downwards,
till they all assume a vertical direction.
The spaces formed between these four quadrants are filled up with four cast
iron blocks. They come to a sharp edge at the surface of the pressed cylinder and
widen out following the curve of the sides of the quadrants above described
forming a guide for these.
These blocks are kept in their places by an iron plate on each end of them, with
pins or bolts through it, and form, together with the four quadrant dies, a solid
mass of iron with a circular hole through it of the diameter required for the
cylinder to be pressed.
In the centre of this hole is placed the core forming the interior of the pressed
cylinder, this also being kept in place by the two iron plates afore mentioned.
The four quadrant dies are extracted to such a distance as may be required for
the wet pulp. When these spaces are duly charged the die is placed between the
plates of a hydraulic or other press, and these acting in the vertical direction
which the quadrant dies have assumed force them together and against the core
until they touch, when a complete circle of compressed pulp is formed.
To allow for the slight horizontal motion of the top of the dies due to their
circular travel when pressing, these are fitted with a link or rocking motion at their
contact with the plates of the press.
The internal core is made in four pieces, two being tapered in their lengths so
that they can be easily drawn out. The other two pieces then come together
entirely releasing the interior of the pressed cylinder.
The merit of my invention is that by making the die sectionally into quadrants
and giving the sides of these as they recede backwards a curved form I obtain a
die to which vertical pressure to the four parts can be applied at the same time in a
hydraulic or other ordinary press, and which when the parts are pressed home,
forms the outside of a complete cylinder; the inside being formed by a collapsible
core all as above described.
CT
1905

page_text: Improvements in Moulds for Forming Wood or other Pulp into
Hollow Cylinders.
I, RICHARD HENRY BRUNTON Civil Engineer of 3! Gipsy Road West Norwood
London 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 :-
The object of my invention is to make, from wood or other pulp, hollow cylinders
which may afterwards form the sides of barrels, canisters, pails, cases for containing
shot or lead powder, now used for testing the mountings of ordnance, and' for other
purposes.
On the annexed drawings the invention is illustrated diagramatically.
Fig. I is a cross section of the mould with the four quadrant dies closed.
Fig. II is the same with the dies open.
Fig. III is a longitudinal section of the press or mould.
D D D D are four dies the surfaces of which, when pressed home form a circle.
CC are the sides of the mould, which, with the wedge shaped pieces E, E, form
guides for the movement of the quadrant dies.
On both ends of C C and E E are projecting pins marked a over which covering
plates, marked g, Fig. III, are secured keeping the whole rigidly in place; the
quadrant dies D D D D travelling in the spaces left between the different pieces-
A A and B B are together a collapsible core, which forms the interior of the
cylindrical vessel pressed. This is kept in place by projecting through the covering
plates marked g Fig. 111 at each end. B B by being made slightly tapered can be
withdrawn, when the two pieces A A come together and give freedom for the
withdrawal of the pressed article.
The surface of this core, as also of the quadrant dies D D D D is made with
grooves marked e, which form channels for the escape of the water pressed from
the pulp. Over these are placed sheets of perforated iron marked ƒ which form
the surface against which the pulp is pressed and dried.
Sinkings marked i are left on the side pieces CC, in which stops marked h move,
and regulate the distance of travel of the quadrant dies.
On the ends of the dies are placed rollers marked c, which, though kept in
place by the pins marked d, travel sufficiently to make allowance for the lateral
movement of the ends of the dies, when being pressed home.
The operation of the mould as above described is as follows:-
The mould, having its different parts in their proper places, is placed on end,
and the quadrant dies extracted to their full extent as shewn in Figure 11. The
top covering plate is then removed, and the large spaces left between the die &
the core filled, by means of force pumps or otherwise, with wet pulp. The top plate
is then replaced, the mould placed in a horizontal position and put between the plates
of a hydraulic, or other press. These, acting on the quadrant dies, force them
together, and against the core until, when home, a complete cylinder of compressed
pulp is formed marked k in Fig. 1.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. By dividing the die sectionally into quadrants, and by giving these as they
recede from their surfaces a curved form, I obtain a mould, to which, by vertical
pressure alone, a perfect cylinder can be formed.
2. A core to resist the pressure of the dies, from the outside, which is collapsible,
and allows for the easy removal of the cylinder pressed.

page_text: 3. Rollers, on ends of dies, to take lateral movement due to direct vertical
pressure.
4. Resolving a vertical pressure, from a hydraulic or other press, into a direct
centrifugal pressure acting on cylinder pressed.
5. The manufacture of cylinders &c. for the various purposes described or for
other purposes, from wood or other pulp, substantially as herein before described,
and illustrated with reference to accompanying drawings.
Dated this 15th day of October 1895.
R. HENRY BRUNTON.