Improvements in Apparatus for Making Cores for Sand Moulding.
Year: 1896

page_text: Date of Application, 21st July, 1896-Accepted, 17th Apr., 1897
COMPLETE SPECIFICATION.
Improvements in Apparatus for Making Cores for Sand Moulding.
We, THE SINGER MANUFACTURING COMPANY, Sewing Machine Manu-
facturers, Kilbowie, Dumbartonshire, HUGH MCFARLANE, Engineer, DAVID
CRAMB, Foundry Manager, and ALEXANDER LAWRIE, Pattern Maker, all with
said company at above address, do hereby declare the nature of this invention
aud 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 apparatus designed for making cores in green sand for
use in moulding.
The invention is illustrated by the accompanying drawings, Fig. I being a front
elevation and Fig. 2 a horizontal section on the line e-, Fig. 1, of the machine,
whilst Figs. 3 to 7 are views of the parts of the core box shewing their relation
to each other in the various stages of the core making operation.
The core making machine consists of a lower hollow platform A carrying a
vertically situated hydraulic or other pressure cylinder B having a ram C working
in it, to the upper end of which a platen D is secured. On opposite sides of this
platen D brackets E are fixed each of which carries two bearing blocks F which
work against V-shaped guides G formed on brackets H rising from the platform A,
said brackets H carrying at their upper ends an entablature or resisting block I.
The bearing blocks F are capable of adjustment to or from their brackets E by
pinching screws e passing through said brackets and bearing upon the blocks F,
as shewn at Fig. 2. On the upper face of the platen D one half D of the core
box is placed, said part D' being positioned by means of pius d secured or formed
on the upper surface of the platen. These pins d bear against lugs d' ou the
part D¹ of the core box and prevent all horizontal movement whilst at the same
time permitting of this portion D' of the core box being easily removed when the
core has been formed. The under surface of the resisting block 1 has the upper
half of the core box secured to it, as shewn at Fig. 1, by screws or otherwise as
it is not necessary during the making of the core to remove this portion. When
the lower half Di of the core box has been filled with sand a making up box J is
fitted over it, as shewn at Fig. 3 and this is also filled with sand, the purpose of
this box J being to admit of piling upon the sand in the lower part Di sufficient
sand to form the upper half of the core when by the action of the ram C the sand
is pressed against the box I' on the under surface of the resisting block I.
The action of the machine is as follows:-
When the lower half D' of the core box has been filled with sand and the core
iron placed therein, the making up box J, which has projecting fingers j to guide it
to its proper position and secure it temporarily upon the upper edge of the part D',
is placed upon said part, and is also filled with sand. After the sand has been
pressed by hand, to give it sufficient adhesiveness, the making up box J is removed
and by operating a hand lever M connected to an admission valve M' the pressure
water is admitted to the cylinder B, and the ram C carrying the platen D is
caused to travel upwards, until the sand piled upon the lower half D¹ of the core
box is pressed as shewn at Fig. 4 against the upper portion l' of the core box
secured upon the resisting block I, and so forms the complete core. The
portions D, 1, of the core box have their meeting edges sharply beveled or made
as knife edges as shewn particularly at Figs. 3, 4, 5 and 6, so that no fiu or rib is

page_text: left upon the finished core, and pressure of the knife edges upon each other such
as to result in injury of the edges is prevented by properly adjusting a set of
screwed pins or studs fitted in the resisting block I.
When the core has thus been formed the pressure water in the ram is opened
to the exhaust and the platen D lowered and with it the finished core K lying in
the lower half D₁ of the core box as shewn at Fig. 5. The lower portion D' of
the core box is then removed from its positioning pins d and placed upon a table.
Over the top of this part D' is placed as shewn at Fig. 6 a core rest, consisting of
a plate L resting upon legs 1 the inner surface of the plate being shaped to suit
the upper portion of the core. These two parts, the core box D' and the core
rest L, are then turned over together, the portion D' of the core box being placed
bottom upwards with its lugs d resting upon the shoulders j' on the core rest J
as shewn in plan at Fig. 7, and this portion D' is then removed. All this is
performed without the necessity of touching the core with the hands, and the core
lies upon its rest ready to be lifted and placed in the mould for which it is
intended.
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. Apparatus constructed and arranged to operate as described for making
green sand cores for use in moulding.
2. In apparatus for making green sand cores the combination of the movable
platen and stationary entablature or resisting block each carrying a portion of a
core box made in two parts having beveled or V-shaped meeting edges, and
adjusting screws or studs adapted to limit the movement of the platen, substan-
tially as described.
ated this 20th dox of lul, 1906
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicants.