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j o. H. W060 ETAL
~ 2,409,330
Filed April'lz, 1945
3 Sheets-Sheet 1
Patented Oct. 15, 1946
David Howardv Wood, Barnt Green, and Herbert‘
James Roe, Knowle, England
Application April 12, 1945', Serial No. 587,9881
In Great Britain November 20, 1943 -
2. Claims. (01. 22~1o>
The invention.v relatest'o core‘ making machines
air maybe forcedto drive down the piston- so-that
or, as they are" perhaps more: frequently called,
its rod I‘! will rock a bell-crank lB-to one arm of
coreblowing; machines of the kind in which the
which it is connected and the‘ other arm of the
divided material of‘ which the cores are to be
bell-crank is preferably equipped with a roller. 19
made; usually sand’, is fed': into" a container. or 5. and engages an end disc 20 closing. a tubular
magazine above a table on‘which‘the core box is
plunger 2! in a guide 22, and the top of‘ this
placed and an air stream is charged into the
plunger is flanged andbolted. to the underside of
container or magazine under‘ pressure and: the
the table [3. A spring. 23: around the piston rod
sand is blown or forced through'apertures in the
in the cylinder |6~ assists the weight of the table
base plate of the: magazine: and. into. correspond
ingv apertures in; the c’ore'box' leading to the‘ cavity
or cavities in which the core or» cores is to‘be
The improved machine: according‘ to‘ this inven~
tion provides a combined pneumatic and-hydraulic
arrangement for moving- the" sand container or
magazine unit to any. desired distance within its
range from’ the table, which arrangement gives _
a very smooth and even movement.
The improved. machine also has a convenient
and simple means-for imparting at small, even
in returning. the parts and the piston [5. The
surface of the table is preferably provided, with
removable, hard steel plates 2H bolted in posi
On. each side of the table l3 rigidly secured‘ in
the bed or base casting H1 is an upstanding pillar
rod 24 and upon these two pillars 24 is suitably
guided the sand container or magazine II. The
guiding means comprise a pair of split bearings
i'ii'projectingi laterally from the sides of the body
of the magazine and av second pair of split bear
movement to the: table towardsthe magazine for
ings 2‘6-near the lower part of the magazine, both
pairs being capable of sliding on the pillars 24
clamping thev core box‘, placed upon. it- securely to
the/underside of the container or magazine.
so that .they can be ?xed on the pillars in order
and. both being equipped with clamping means
Other featuresof» the machine will be pointed 25 to set the magazine at thedesired height.
out‘ in’ the: followingvv description; oft a preferred
The clamping means shown‘ comprises a screw
embodiment which~ is illustrated in- the‘ appended:
rod 21 anchored-in a lug 28 of a split bearing and
drawings; and the scope of the protection desired
working in. a, tapped bore in a second lug 29 to
is: de?ned-int the claims hereinafter appearing:
draw the two- together when the handle 30‘ is
Figure 1 is a front view of the machine with 30 appropriately turned. The sand magazine H is
parts broken. away, and a; sand feedh'oppe'r‘ and
directly over the table‘ i3 and the. pressure plate
a motor omitted from thetop-of the- ?gure. .
Figure 2 is a side‘ view thereoi; but showing
M which also acts as a. sand delivery plate, at the
base of the magazine is opposite the table surface
part of the hopper.
so that a core mould box placed on the table
Figure 3 is a sectional view’ of' part of the base 35 be clamped: securely between the table and
bottom of the sand. containing magazine by
of the machine showing. themeansior moving. the
forcing of the table upwardly by the piston
Figure 4 is a part‘; sectional viewvoi the’blowing?
bell-crank means already described. This
container or magazine.
ward movement need only be small since
In this embodiment of the machine: i0: is the 40 sand container will‘. be set to suit the depth of
base casting, H- is the blowing container or'maga'
the box, and it is only the clamping and sealing:
zine for the sand-and‘ I2‘ is the hopper by which
of the box against the pressure and. delivery plate
the sand is fed in the desired amounts; to: the
ofv the sand magazine that has. to be effected" by
container or magazine; I l. Thetable which. sup
the table movement.
ports/the moulding’ boxes of various’ sizes is re 45
The upper part of each pillar 24 is enclosed in
ferred to by'the numeral i3», and the substantial
a cylinder 31, the lower end of which is bolted: to
pressure plate and sand delivery plate-at the base
a stout ?ange 32 on the upper guide bearing 25
of the magazine, which is opposite the table and
of the sand container or magazine HI, and thisv
co-operates with it. in the clamping of- the box,
cylinder 3 I‘ is closed above the top of the pillar by
is. marked Id.
' a plate‘ 33" through which a small ori?ce 34, or
Forf'this purpose: of‘ clamping the box. thetable
more than. one, will be provided. Above this per"?
I 3' is adapted for a small upward. movement with
forated closure plate an enlarged pressure cham
respect to the‘ substantial bed. or casting; Hi? the
ber 35. is provided, the purpose of which is to re“
means for this purpose‘. comprising. a. piston‘ l5:
ceive a suitable fluid such as oil and provide‘ an
moving; in a. cylinder l6‘: above which. compressed
air space above‘the ?uid to. which compressedair
_ '
can be led. The enlarged, ballon-like chamber 35
35 at the top of the pillar cylinder 3| have been
gives effective storage without increasing head
subjected to air pressure to raise the sand maga
Zinc II to a given height for a particular box,
'or series of boxes, and the magazine bearings
room demands, and the restricted ori?ce ensures
a slow, smooth movement and a dashpot eiTect,
when pressure is released.
As there are two cylinders 3 I, one on each pillar
have been clamped securely in that position, a
core box has been inserted, and the table raised
24 there are two enlarged pressure chambers 35
and a common connecting air pipe 33 between
by admitting compressed air in the cylinder I6
magazine guides 25, 26, have been released, the
air pressure will drive the oil through the small
‘-‘balloons" 35 is‘ released and, after the' clamps
are slackened, the sand magazine with its‘agita
tor and motor unit will'retu‘rn slowly down the
above the table piston I5 to clamp the box and
make a sandtight joint between the openings in
them can be provided with a compressed air lead
31 so that the pressures in the two chambers will 10, the pressure plate I4 and those in the core box,
the air pressure is admitted to the annular cham
be equalised above the level of the ?uid therein.
ber 4| , above the pressure plate and the motor
The oil may be inserted through a cock at 38 and
58 is startedto drive the agitator arms 49 and
drained when necessary by a tap 39 below the
paddles and the ‘core or cores in the box is/are
ori?ce 34 and above the point of maximum entry
15 rapidly blown and so formed. The table cylinder
of the pillar 24.
I6 is then exhausted and the table I3 moves down
The upper end or face of each pillar 24 is pro~
under gravity reinforced by the spring 23 and
vided with a suitable removable piston face 40
returns the bell crank I8 and piston I5. The
to act as a piston against the walls of the cyl
?lled box is then removed.
inder 3|. If compressed air is admitted to the
If the box height is to be varied the air pres
upper parts of the pressure chambers 35 when
sure- above ‘the oil ‘in the pressure chambers or
the clamping means on the sand container or
ori?ce 34 in the closure plate 33 of each and
against the piston face 40 of the ?xed pillar 24. 25 pillars '24, the oil being forced up through ‘the
restricted passages 34, in the closure plates 33
By the reaction of this ?uid between the piston face
in the cylinders 3 I .
and the apertured plate 33 across the cylinder 3I
The control of the machine may be made very
each cylinder will be raised so as to lift the whole
simple by arranging the compressed air supply
of the sand container or magazine assembly bode
ily on the pillars 24 to any height required above 30 leads to be brought toa suitable multi-way con
trol cook 60 for distribution to the table cylin
the table. The assembly will then be clamped in
der, the pressure chambers or “balloons,” ‘and
the desired position by the clamps on the guides
the annular chamber 4|. This point is arranged
of the container or magazine I I.
adjacent to the agitator motor switch so that
The pressure plate I4 at the lower part of the
sand container or magazine 'is bodily removable 35 the controls for the table or base, and the motor,
may be all assembled Within easy reach of an
and bolted in place, and this plate will be pro
operative. The part seen at BI is a free jet for
vided with the necessary opening or openings
through which sand may be driven by compressed
cleaning purposes. 62 is a pressure gauge.
air admitted to the container to blow the sand
We claim:
into the shaped cavities in the core box to ?ll
1. Core making or blowing machine having a
the latter with the core sand and so mould the
container for sand, means including a table for
cores required.
supporting-a core box below the container, an
The lower part of the container has an annu
lar chambered part M in its Wall to which the
compressed air connection is made at 42, Figure .
2, and provided with an inlet valve 43. The
handle 44 of this valve may be coupled to an air
exhaust valve at 45 in the magazine so that when
the inlet valve is closed the exhaust from the
magazine is opened, and vice versa. Within this
annular air belt M is arranged a perforated cy
lindrical plate 46 covered with a Wire gauze or
like sleeve 4'! so that the air is split up into many
?ne streams or jets, and a thorough mixture of
the compressed air with the sand takes place as
the sand is agitated within the container by the
mechanical agitator.
apertured pressure and sand delivery plate at
the base of the container, means for supplying
air under pressure to the container for forcing
sand through said apertured plate into the core
box, a pair of pillars disposed one at each end
of the table, means for guiding the container on
the pillars and means for clamping it thereon,
a pair of cylinders secured to the container and
capable of sliding on the pillars each of which
pillars is adapted to act as a ?xed piston in one
of said cylinders, combined pneumatic and hy
draulic means whereby ?uid pressure may be ad
mitted to the cylinders above the piston faces
of the pillars for raising said container thereon,
and means ?xedly mounted in each cylinder above
the pillars to form a restricted passageway for
the passage of ?uid from the upper part to the
lower part of the cylinder, which means act as
dashpots to give a smooth and slow action dur
ing ascent and descent of the cylinders and the
The agitator may consist of a hub 48 with
skeleton arms 49 and paddles projecting from
the hub and the hub is secured on a drive spin
dle 50 which is enclosed in bearing-bushes BI,
52, carried and enclosed by a stout elbow casting
53 which can be bolted securely against the side
wall of the container or magazine bore, see Fig
2. Core making or blowing machine having a
ure 4. The drive spindle 50 is provided with a 65 container for sand, means including a table for
bevel gear 54 driven by a similar bevel 55 on
supporting a core box below the container, an
gear shaft 56 projecting from a speed reduc
apertured pressure and sand delivery plate at
tion gear box 5‘! of a suitable kind in which the
the base of. the container, means for supplying
input shaft is driven from an electric motor 58.
air under pressure to the container for forcing
The motor 58 and its starter 59 is arranged 70 sand through said apertured plate into the'core
above the magazine I I on a suitable platform and
box, a pair of pillars disposed one at each end of
also secured on top of the magazine is the sand
the table, means for guiding the container on
hopper or chute I2 from which the magazine is
the pillars and means for clamping it thereon, a
supplied with sand.
pair of cylinders secured to the container and
After the oil pressure chambers or “balloons” 75 capable of sliding on the pillars, each of which
pillars is adapted to act as a ?xed piston in one
of the cylinders, an enlarged vessel containing.
a supply of}, liquid arranged above each of said
cylinders, each of said vessels being provided
with a ?xed apertured closing plate between the 5
vessels and the top of the cylinder which serves
as a dashpotto give a. smooth and slow action
during ascent and descent of said cylinders, and
means for supplying air under pressure to each
vessel above the liquid therein whereby ?uid pres
sure in the cylinders above the ?xed piston faces
therein is caused to raise the cylinders‘and the
sand container upon the pillars.
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