Improvements in Sand Moulding Machines.
Year: 1893

page_text: Date of Application, 24th Mar., 1893
Complete Specification Left, 27th Dec., 1893--Accepted, 24th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in Sand Moulding Machines.
We, FREDERICK GEORGE LEEDER of Woodside, Cardross, Dumbartonshire,
Engineer and WALLACE FAIRWEATHER, C.E., Director of The Patent Sand
Moulding Machine Company (Limited) 17 Royal Exchange Square in the City of
Glasgow do hereby declare the nature of this invention to be as follows:-
This invention is a development of the improvements in sand moulding machines
described in the Specification of Letters Patent No. 11,368 of 1888 and it has for
its object the adaptation of means for operating such machines by hand or
mechanical power in cases where hydraulic power is not available.
The improved machine as regards the arrangement of the sand flasks or boxes
fitted to slide on guides with the swinging pattern plate between them is similar to
that of the machine described in the aforesaid Specification, but the platen which
carries the bottom board on which the sand rests, and the lower mould box or flask
instead of being raised by hydraulic rams are raised and lowered by toggle jointed
or other levers or by cams, eccentrics or like devices operated by separate hand
levers or treadles or belt driven or other gearing so arranged that the bottom box
and the platen within it may be raised together or separately. Pressure upon the
sand in forming the moulds may be applied solely by the toggle levers or other
rearing used for raising the boxes and platen or bottom board or such gearing may
be used merely to raise the boxes and platen into a position in which pressure may
be applied by depressing the abutment or entablature over the upper box or flask
the said entablature when made movable being operated by a screw as in a hand
or power screw press or by a cam or eccentric or by toggles or other levers or
equivalent devices.
In this way the major portion of the movement of the boxes in pressing
the sand may be effected by balancing or partially balancing the weight of the
moving parts and the lesser movement required in applying the requisite degree of
pressure to the sand for forming the mould may be effected by a screw as in a fly
power.
press or by a cam or like device operated by hand or by mechanical
the pressure is relieved and the lower box descends the pattern plate is swung out,
the upper box is lowered and the mould is ejected by raising the inner platen or
bottom board.
Dated this 23rd day of March 1893.
After
CRUIKSHANK & FAIRWEATHER;
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
· Improvements in Sand Moulding Machines.
We, FREDERICK AUGUSTUS LEEDER of Woodside, Cardross in the County of
Dumbarton, Engineer, Executor of the late Frederick George Leeder of Woodside,
Cardross in the County of Dumbarton, Engineer, acting conform to Decree
Dative by the Sheriff Substitute of Stirling, Dumbarton and Clackmannan, dated
at Dumbarton the Seventeenth day of November, Eighteen hundred and
ninety-three, and WALLACE FAIRWEATHER, C.E. Director of The Patent Sand
Moulding Machine Company (Limited), of 17 Royal Exchange Square in the

page_text: County of the City of 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 is a development of the improvements in sand moulding machines
described in the Specification of Letters Patent No. 11368 of 1888 and it has for
its object the adaptation of means for operating such machines by hand or
mechanical power in cases where hydraulic power not available.
The improved machine as regards the arrangement of the sand flasks or boxes
fitted to slide on guides with the swinging pattern plate between them is similar to
that of the machine described in the aforesaid Specification but the platen which
carries the bottom board on which the sand rests and the lower mould box or flask
instead of being raised by hydraulic rams are raised and lowered by toggle jointed
or other levers or by cams or eccentrics or like devices operated by separate hand
levers or treadles or belt driven or other gearing so arranged that the bottom box
and the platen within it may be raised together or separately. Pressure upon the
sand in forming the moulds may be applied solely by the toggle levers or other
gearing used for raising the boxes and platen or bottom board or such gearing may
be used merely to raise the boxes and platen into a position in which pressure may
be applied by depressing the abutment or entablature over the upper box or flask
the said entablature when made movable being operated by a screw as in a hand or
power screw press or by a cam or eccentric, or by toggles or other levers or
equivalent devices.
In this way the major portion of the movement of the boxes in pressing the sand
may be effected by balancing or partially balancing the weight of the moving parts
and the lesser movement required in applying the requisite degree of pressure to
the sand for forming the mould may be effected by a screw as in a fly press or by
a cam or like device operated by hand or by mechanical power. After the pressure
is relieved and the lower box descends the pattern plate is swung out, the upper
box is lowered and the mould is ejected by raising the inner platen or bottom
board.
In the accompanying drawings
Figure 1 is a vertical section, Figure 2 a front elevation, Figure 3 a horizontal
section and Figure 4 a detail plan of one modification of the improved sand
moulding machine which is composed of a framing K carrying upper and lower mould
boxes A, B and a swinging pattern plate arranged as described in the Specification
above referred to.
The bottom box is supported on toggle levers D and within this box the platen
is also supported on toggle levers F.
The boxes are filled in the manner described in the Specification before referred
to, that is to say, the lower box B is filled with sand and the pattern plate (not
shewn on Figs. 1 to 4) swung into position over it, the upper box A is then lowered
upon the pattern plate and also filled. The hand lever is then operated and by
means of the toggles D the upper and lower boxes with the pattern plate between
them are raised against the entablature E this movement compressing the sand in
the upper box only. The sand in the lower box B must now be compressed, and to
effect this the platen I is raised by means of the toggles F by actuating the lever G
so compressing the sand in the lower box between the underside of the pattern
plate and the platen. The bottom box B is then lowered and with it the pattern
plate until the pattern plate rests upon a collar secured on the vertical rod upon
which said plate is pivoted. The pattern plate is then swung out, the upper box
lowered upon the box B, and the top and bottom portions of the mould thus brought
together. To eject the mould the movable portion H of the platen I is still further
lowered by means of the toggles F until a pinhole a in the part H comes opposite a
like hole in a downward extension of the platen I. The two portions H and 1
are then pinned together and the toggles F again operated to raise the platen
up through and above the top of the upper box A, when the mould can be removed

page_text: Another modification illustrated in front elevation by Figure 5 and in detail of
the mould ejector in Figure 6, shews a friction driving gear applied to the machine
consisting of a friction wheel J and two friction discs L, L' fitted on a horizontal
shaft L driven by belt or other gearing a hand lever M being provided for throwing
either of the discs L, L' into gear. The spindle N which carries the friction
wheel J has a screw thread cut upon it which enters a nut on the platform 0 of
the machine the entablature E which in this case has a vertical movement to
compress the sand in the top box A only, being secured to one end of the spindle.
The platen I within the lower box B is raised by toggle levers, cams or eccentrics or
by the foot lever P, Figure 6, and pressure is brought to bear on the sand by
means of the screw N the mould is finally ejected by the treadle lever.
Figures 7 and 8 are part vertical sections taken at right angles to each other of
a further modification in which the lower box is raised by a cam Q operated by
the lever R pressure being brought to bear on the sand by the cam S operated
by the lever T or treadles may be substituted as shewn by dotted lines at
Figure 7.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The combinations of parts constituting the improved sand moulding machines
hereinbefore described under several modifications with reference to the accom-
panying drawings.
2. In a sand moulding machine the combination with top and bottom flasks or
mould boxes and an intervening pattern plate of hand or power devices for applying
pressure to the sand and for ejecting the moulds, substantially as described.
Dated this 23rd day of December 1893.
CRUIKSHANK & FAIKWEATHER,
62, St. Vincent Street, Glasgow, Agents.
CRUIKSHANK & FAIKWEATHER,
62, St. Vincent Street, Glasgow, Agents.