Improvements in Pneumatic Moulding Apparatus.
Year: 1891

page_text: Date of Application, 8th Sept., 1891
Complete Specification Left. 28th May. 1882-Accepted. 2nd July, 1882
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Moulding Apparatus.
A communication to me from abroad by R. RICHTER, of Gablonz, in the Empire
of Germany.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, do hereby declare the nature of this invention to be as follows :-
The present invention has for its object improvements in apparatus for making
moulds for casting in sand, the sand being cut to the suitable shape to form the
required mould, and the loose sand removed being withdrawn by an exhaust fan
until the mould is completed.
The apparatus for this purpose consists essentially of an exhausting fan con-
nected with a sand reservoir. Into the latter leads a pipe the other end of which
(at the other end of the apparatus) is bent downward, and has attached to it a
cutter or tool, of the required shape to form entirely or partly the required mould
which is to receive the melted metal.
By means of suitable mechanism the hollow cutting tool is forced down into the
sand to the depth required to form the mould, the sand cut off in the process being
withdrawn through the cutter and through the pipe already described into the
sand box, by the fan. After this operation the tool is withdrawn from the sand,
and is continually forced down into it afresh, by a succession of strokes, until the
desired shape has been formed in the sand which is to form the mould, the loose
sand being continually drawn away by the fan.
The mechanical arrangements for the working of the cutter, against the sand in
the mould on the one hand, and of the latter against the cutter on the other hand,
must of course be properly adapted and proportioned to the object in view, as
hereinafter described.
By means of a driving belt, a disc at the outer end of the machine is set in
revolution, and a crank pin upon it is fitted with a block, which slides in a
horizontal slot at the upper end of a bar, which works vertically in guides upon a
support below so that the bar is made to rise and fall as the disc revolves. A
second bar is pivotted at its upper end to the moving bar described, whilst its
lower end carries the turned down end of the suction pipe provided with the cutting
tool as already described.
Below the tool is arranged a moulding box, filled with sand in a suitable con-
dition, and which can be adjusted in any desired position below the cutting tool.
Supposing that the cutting tool is to be used, by means of the revolution of
the disc, for cutting teeth in the sand to form a mould for the teeth of a spur
wheel, as it rises and falls,-a raised semi-circular projection is formed upon
the face of the disc, in such a position that when the crank pin is at the bottom
of its stroke the projection is on the upper part of the disc and its advancing
end comes in contact with a vertical pivotted lever, the lower end of which
is connected with the lower end of the hanging bar which carries the tool in
such a manner that, as the latter rises, it is drawn very slightly back so as to
be clear of the mould which is being formed, whilst when the tool has arrived
at the top of its stroke the projection releases the lever, which together with
the cutting tool is forced back by a spring to the position for cutting during its
down stroke.
If the full depth of the tooth mould cannot be formed at a single stroke, then
after such stroke the whole of the mechanism described must be moved for a short
distance endwavs so that the tool has a fresh out. For this purpose the slotted

page_text: rising and falling bar has connected to it a ratchet arm, the lower end of which
engages with a corresponding wheel, in such manner that the latter is turned round
for a short distance when the.tool is at the top of its stroke. The spindle which
carries the ratchet wheel drives by suitable toothed wheels a screw in a horizontal
arm of the machine, upon which the entire apparatus described is fitted and slides,
the screw passing through a nut at the back of the latter, so that after each stroke
of the tool the apparatus is fed slightly forward to give the cut for the next stroke.
When the full depth of the tooth has been formed, the feed forward of the cutter
must cease. For this purpose a bar, not connected with the moving support, is
arranged so as to hold back a weighted lever until the full depth of the tooth has
been formed, when the weight is released and throws the catch out of gear with
the ratchet wheel, so that the latter is no longer actuated and the apparatus moves
no further upon its slide.
In order to ensure an easy and smooth working of the machine, the rising and
falling bar is connected above to a balance lever. "The tool is of course made of
the proper form for the teeth which are to be produced and it is screwed on the
lower end of the suction pipe described. In this pipe valves may be arranged by
which the force of the draught through it may be regulated as desired.
Dated this 8th day of September 1891
EDWARDS & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Pneumatic Moulding Apparatus.
A communication to me from R. RICHTER, of Gablonz, in the Empire of
Germany.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, do hereby declare the nature of this invention and in what manner the
Bame is to be performed, to be particularly described and ascertained in and by the
following statement and accompanying drawing that is to say :—
The present invention has for its object improvements in apparatus for making
moulds for casting in sand the sand being cut to the suitable shape to form the
required mould, and the loose sand removed being withdrawn by an exhaust fan
until the mould is completed.
The accompanying drawing is in illustration of the invention, Figure 1 being a
side view, and the remaining figures detailed views of different parts of the
apparatus.
The apparatus consists essentially of an exhausting fan a connected with a
sand reservoir b. Into the latter leads a pipe c the other end of which (at the
other end of the apparatus) is bent downward, and has attached to it a cutter or
tool d, of the required shape to form entirely or partly the required mould which
is to receive the melted metal.
By means of suitable mechanism the hollow cutting tool is forced down into the
sand to the depth required to form the mould, the sand cut off in the process by the
cutter being withdrawn through the pipe c already described into the sand box h,
by the fan a. After this operation the tool is withdrawn from the sand, and is con-
tinually forced down into it afresh, by a succession of strokes, until the desired
shape has been formed in the sand which is to form the mould, the loose sand being
continually drawn away by the fan.
The mechanical arrangements for the working of the cutter against the sand
in the mould on the one hand, and of the latter against the cutter on the other
hand. must of course be properly adapted and proportioned to the object in view,
as hereinafter described.
By means of a driving belt, a disce at the outer end of the machine is set

page_text: in revolution in the direction of the arrow and a crank pin ƒ upon it is fitted
with a block, which slides in a horizontal slot in a transverse bar at g at the
upper end of a vertical bar h', which works vertically in guides upon a support
below so that the bar h is made to rise and fall as the disc e revolves. A second
bari is pivotted at its upper end i¹ to the moving bar h described, whilst its lower
end carries the turned down end of the suction pipe e provided with the cutting
tool d as already described.
Below the tool is arranged a moulding box & filled with sand in a suitable con-
dition, and which can be adjusted in any desired position below or in relation to
the cutting tool.
Supposing that the cutting tool is to be used by means of the revolution of the
disce, for cutting teeth in the sand to form a mould for the teeth of a spur wheel,
as it rises and falls, a raised semi-circular projection is formed upon the face of
the disc, in such a position that when the crank pin is at the bottom of its stroke
the projection is on the upper part of the disc and its advancing end / comes in
contact with a vertical pivotted lever m, turning upon a centre m² the lower end of
which is connected with the lower end of the hanging bar i which carries the tool d
in such a manner that, as the latter rises, it is drawn very slightly back so as to be
clear of the mould which is being formed, whilst when the tool d has arrived at
the top of its stroke the projection releases the lever m, which together with the
cutting tool is forced back by a spring n to the position for cutting during its down
stroke. If the full depth of the tooth mould cannot be formed at a single stroke,
then after such stroke the whole of the mechanism described must be moved for a
short distance endways so that the tool has a fresh cut. For this purpose the
slotted rising and falling bar g has connected to it a ratchet arm o, the lower end
of which engages with a corresponding wheel p in such manner that the latter is
turned round for a short distance when the tool is at the top of its stroke. The
spindle which carries the ratchet wheel p drives by suitable toothed wheels q and r
a screws in a horizontal arm of the machine upon which the support t of the
entire apparatus described is fitted and slides, the screw passing through a nut at
the back of the latter, so that after each stroke of the tool the apparatus is fed
slightly forward to give the cut for the next stroke. When the full depth of the
tooth has been formed, the feed forward of the cutter must cease. For this
purpose a bar not connected with the moving support, is arranged so as to hold
back the weight upon a weighted lever v' until the full depth of the tooth has
been formed, when the weight is released and throws the catch out of gear with
the ratchet wheel p so that the latter is no longer actuated and the apparatus moves
no further upon its slide.
In order to ensure an easy and smooth working of the machine, the rising and
falling bar is connected above to a balance lever w. The tool is shewn in the
figures adapted for moulding the teeth of spur wheels but it is of course altered in
shape for other shapes which are to be produced. It is screwed on the lower end
of the suction pipe described. In this pipe valves may be arranged by which the
force of the draught through it may be regulated as desired.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The improved apparatus for making moulds in sand, consisting of a hollow tool,
moving up and down against the sand, and partly or entirely forming the required
mould in the latter, the cutting tool being connected by a pipe with an exhausting
fan, by which the sand, cut away by the tool is withdrawn, substantially as described
and illustrated.