Improvements in Sand Moulding Machines.
Year: 1893

page_text: Date of Application, 21st Nov., 1893
Complete Specification Left, 21st Aug., 1894-Accepted, 17th Nov.,
1894
PROVISIONAL SPECIFICATION:
Improvements in Sand Moulding Machines.
We, ANGUS MURRAY of Strathroy Dumbreck, Glasgow, Engineer, and
WALLACE FAIRWEATHER C.E., Director of The Patent Sand Moulding Machine
Company (Limited) 17 Royal Exchange Square, Glasgow, do hereby declare the
nature of this invention to be as follows:--
This invention which relates to sand moulding machines of the kind described
in the Specification of Letters Patent granted to Frederick George Leeder
No. 11,368 of 1888 has for its object the adaptation of means for operating such
machines by steam or other elastic fluid in lieu of by hydraulic pressure.
Under the invention the general arrangement of the moulding machine remains
as described in the Specification above referred to but the hydraulic rams are
replaced by a steam cylinder within which is fitted a hollow or annular piston open
at its lower end whilst its upper end is formed with a hollow piston rod corre-
sponding to the outer ram of the hydraulic type of machine and having a head
which serves to raise the mould boxes to press the sand in the upper box. The
inner periphery of the annular piston is bored to constitute a cylinder in which is
fitted a second piston having also a hollow piston rod extending up through a
stuffing box in the outer hollow piston and carrying the platen which serves to
press the sand in the lower box and to eject the mould from the boxes.
In the operation of the machine steam is admitted to the main cylinder under
the pistons to raise both simultaneously for the purpose of raising the mould boxes
and pressing the sand in the top box, the inner piston being prevented from rising
within the outer piston or being balanced throughout the stroke of the latter by
the pressure of steam admitted between the pistons through orifices formed in the
inner tubular piston rod by a steam pipe carried up through a stuffing box into the
said piston rod. Then the steam space between the pistons is opened to exhaust so
that the inner piston rises within the outer piston to raise the platen and press the sand
in the lower box; after which operation the steam space under both pistons is
opened to exhaust to lower the mould boxes and when the pattern plate has been
withdrawn and the mould boxes rest one on the other the mould ejected by
admitting steam to act only under the pistons when the inner one having the larger
area under action will rise within the outer piston and raise the platen; or steam
may be admitted above and below both pistons and the pressure brought to bear on
the mould as desired by exhausting the upper sides as required, or again the same
operations can be effected by the use of two independent cylinders either bolted
together or separated and having a hollow piston rod for one of the pistons to act
through the other or the cylinders may be arranged tandemwise one over and the
other under the machine.
The admission and exhaust of the steam or other elastic fluid is controlled by
suitable valves operated by hand levers.
Dated this 20th dor of November 1893

page_text: : COMPLETE SPECIFICATION.
Improvements in Sand Moulding Machines.
We, ANGUS MURRAY, of Strathroy, Dumbreck, Glasgow, Engineer, and
WALLACE FAIRWEATHER, C.E., Director of The Patent Sand Moulding
Machine Company, (Limited) 17 Royal Exchange Square, Glasgow, 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 sand moulding machines of the kind described in the
Specification of Letters Patent granted to Frederick George Leeder No. 11,368
of 1888 and has for its object the adaptation of means for operating such machines
by steam or other elastic fluid in lieu of by hydraulic pressure.
Under the invention as illustrated in vertical section at Figure 1, in elevation at
Figure 2 and in horizontal section on the line at Figure 3 of the accompanying
drawings the general arrangement of the moulding machine remains as described in
the Specification above referred to but the hydraulic rams are replaced by a steam
cylinder A within which is fitted a hollow or annular piston B open at its lower
end whilst its upper end is formed with a hollow piston rod B' corresponding to the
outer ram of the hydraulic type of machine and having a bead C which serves to
raise the mould boxes D, E, to press the sand in the upper box E. The inner
periphery of the annular piston B is bored to constitute a cylinder in which is
fitted a second piston F having also a hollow piston rod F extending up through
a stuffing box G in the outer hollow piston rod B' and carrying the platen H
which serves to press the sand in the lower box D and to eject the mould from the
boxes.
In the operation of the machine steam is admitted through the pipe a to the
main cylinder A under the pistons B, F, to raise both simultaneously for the
purpose of raising the mould boxes D, E, and pressing the sand in the top box E
the inner piston F being prevented from rising within the outer piston B, or being
balanced throughout the stroke of the latter, by the pressure of steam admitted
between the pistons B, F, through orifices f formed in the inner tubular piston
rod by a steam pipe g, communicating with the casing of the steam dis-
tributing valve or valves, and carried up through a stuffing box h into the said
piston rod. Then the steam space between the pistons B, F, is opened to exhaust
80 that the inner piston F, rises within the outer piston B to raise the platen H
and press the sand in the lower box D; after which operation the steam space
under both pistons is opened to exhaust to lower the mould boxes D, E, and when
the pattern plate I has been withdrawn and the mould boxes D, E, rest one on the
other the mould is ejected by admitting steam to act only under the pistons B, F,
when the inner one F baving the larger area under action will rise within the
outer piston B and raise the platen; or steam may be admitted above and below
both pistons B, F, and the pressure brought to bear on the mould as desired by
exhausting the upper sides as required, or again the same operations can be effected
by the use of two independent cylinders A either bolted together or separated
and having a hollow piston rod for one of the pistons to act through the other or
the cylinders may be arranged tandemwise one over, and the other under the
machine.
The admission and exhaust of the steam or other elastic fluid is controlled by a
suitable valve or valves J operated by hand lever or levers K.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. A sand moulding machine constructed and adapted for operation by steam or
other elastic fluid pressure, substantially as described.
2. In a sand moulding machine the combination of steam cylinders and pistons
constructed and arranged to operate, substantially as described.
Dated this 20th day of August 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.