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Патент USA US2114111

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April 12, 1938.
H. o. MAGNUSON
2,114,111
SAFETYVAPPLIANCE FOR MOLDING MACHINES
Filed Déc. 23, 193'?
2 Sheets-Sheet l
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April 12, 1938.
H. o. MAGNUSON
2,114,111
SAFETY APPLIANCE FOR MOLDING MACHINES
Filed Dec. 23, 1957
QN.
bn
2 Sheets-Sheet 2
2,114,111
Patented Apr. 12, 1938
' UNITED STATES PATENT orries I '
" 2,114,111
SAFETY APPL'IANCE FOR MOLDING
-
MACHINES
Henry 0. Magnuson, Chicago, Ill., assignor to
Champion Foundry and Machine Company,
Chicago, 111., a corporation of Illinois
"
Application December 2 3, 1937, Serial No. 181,257
'
8 Claims.
This invention relates to molding machines of
the squeeze type, and has reference more particu
larly to- a safety appliance designed to render the
manipulation of such machines safe and forestall
5 any possible injury to the operative through care
lessness or accident.
Molding machines of this type commonly em;
ploy a ?ask-supporting platform, a platen head
that is pivoted either vertically or horizontally
10 so as to swing sidewise or rearwardly between a
working position directly overlying the platform
and an idle position to-one side of the platen,
and a pneumatic motor beneath the platform for
raising the latter so as to compress and pack the
15 sand in the ?ask around the pattern,>the'com
pressicn being effected by the relative movement
of the platform and head toward each other. A
valve, usually opened by the right hand of the
operative, is located in the ?uid supply line to
the motor. It has not infrequently happened
20 that a careless operative, when‘ opening the valve
has allowed his other hand to get caught and
crushed between the top board of the ?ask and
the head.
‘
Many of these machines also employ a device
25 known as a jolter, operated by a rapidly recipro
cating pneumatic motor, for imparting to the
?ask, during the loading thereof and before the
?nal squeezing operation, a rapid vertical shaking
30 movement to evenly distribute the sand that has
been shoveled into the ?ask; and following this
shaking movement the operative adds a ?nal
shovelfull of sand and with his hands distributes
and lightly packs it to complete the ?lling of the
35 ?ask. The valve controlling the admission of
compressed air to the jolter motor is usually
opened by a handle that is pressed by the knee of
the operative. When loading the ?ask and prior
to operating the jolter the head is pushed to one
40 side out of the path of movementof the platform
and ?ask; but sometimes the operative fails to do
this, and, while distributing and packing the ?nal
shovelfull of sand, he sometimes accidentally hits
with his knee. and opens the jolter valve, with the
45 result that his hands or wrists get caught and
squeezed between the top "edge of the open ?ask
and theplaten head;
'
The primary object of this invention has been
to provide a'useful automatic accessory to a ma
50 chine of ‘this type that will render impossible
either or both of the above described accidents.
As will be seen from the following description, the
?rst described accident is prevented by a means
.55,
(01. 22-26)
during the squeezing operation; and the last de
scribed accident is prevented by a means that
requires the head to be shifted entirely out of the
path of the platform and ?ask before the motor
of the jolter can be operated and to remain in
such position until the ?ask is ready. for-the
squeezing operation.
v
,
~
An illustrative embodiment of this invention is
shown in the accompanying drawings, in which
Fig. 1 is a perspective side view of a portable
squeeze-type molding machine embodying my im
.10.
provement.
Figs. 2, 3 and 4 are diagrammaticl'plan
, ;
I views,
Fig. 2 illustrating the relative positions of the
platform
operation;and
Fig.
platen
4 illustrating
head during
thetherelative
?askjolting
posi—
tions of said parts during the ?ask squeezing op.~
eration; and Fig. 3 illustrating intermediate posi
tions of the platen head in and between which
both the main operating valves of- the squeeze 20
motor and the jolt motor are rendered inoper
ative.
>
,
.
-.
Fig. 5 is a sectional view of the auxiliary valve
in the pipe line leading to-the squeeze motor.
-~
Fig. 6 is a similar viewof the awiliaryyalve
in the pipeline leading tothe jolt motor; -
1
First brie?y describing the parts of thecma
chine that are old and well known, 10 designates
the heavy standard carrying the swinging platen
head and its arm, and Il designates aicastingse
cured to the lower-front portion of the standard
In asby bolts 12 and containing the squeezemo
tor, the cylinder and. annular plungerpfwhich
are fragmentarily shown at l3,and M respective
ly,» and the‘ plunger 15 of the jolt motor which
operates in a central bore of the plunger 14. The
plunger 14 of .the squeeze motor carries, on its
upper end a platform H5 that supports the-?ask.
In the upper front portion of the standard‘ I 5 is
a vertical shaft ll, on which is journaled the
elongated hub l8 of a forwardly projecting arm
I9 carrying at its free end a'vertically'adjustable
platen head
20.
1
,
-
k
g
,
H
1
2| designates the pipe line leading from a
source of compressed pairv or other motive ?uid,
and communicating with the line 2| is a branch
22 that supplies motive fluid to the squeeze motor
and also a branch 23 that'suppliesmotive ?uid
to the jolt motor. In the line 22 is a main self
closing control valve indicated at 24 that-is
opened by'the'operative by depressing a pivoted
handle 25 conveniently accessible from the front
of the machine; and in the line 23.is a main self
which requires both hands of the operative to be
closing control valve indicated at 26 that is so
engaged 'in safe ‘positions’ at the inception of and
located astc be conveniently opened by the op
2
2,114,111
erator by pressing his knee against a depending
valve handle 21.
I have herein shown a portable machine where
in the standard Ill and the casting II are sup
ported on a rear wheel 28 and a pair of front
wheels 29; but this portable feature has no rela
tion to my present improvement, the latter being
equally applicable to stationary machines.
Coming now to those features wherein my pres
10 ent improvement resides, in the branch line-3
22 that serves the squeeze motor is inserted an
auxiliary valve designated as an entirety by 30
and shown in enlarged section in Fig. 5. This
valve is in itself" an old and well known type of
15 valve and comprises a casting formed with op
posed tapped branches 3| and 32 for insertion
into the pipe line served thereby, a central cham
ber divided by a bridge 33 formed with a valve
seat 34, and a plunger valve 35 slidable in a cylin
20 drical guide 36 constituting a branch of the cast
ing 30. The valve 35 has a gasket 31, cooperating
with the seat 34, and in rear of the valve is a
spring 38 footed on a nut 39 and forcing the
valve 35 to its seat. To balance the air pressure
25 on opposite sides of the valve when the latter is
open, and to enable the air to assist the spring in
holding the valve closed, the valve body is formed
with a pair of opposed bleed ducts 40. On the
face of the valve body 35 is formed a central
30 socket 41 that receives the inner end of a stem 42
that is slidably mounted in and projects beyond a
packed bearing 43.
air pressure behind it, so that if the operative
loads the ?ask on the platform 16 while the head
20 is at or between the positions shown in Fig. 3,
and accidentally strikes the main valve handle 21
with his knee, he cannot be injured during the
jolting operation, since the motive ?uid cannot
reach the jolt motor until the head 20 has been
swung entirely clear of the vertical path of travel
of the platform and ?ask, as shown in Fig. 2,
which opens and holds open the auxiliary valve 10
30’. Even if the head be swung to the position
shown in Fig. 3, its arm does not open the aux
iliary valve 30', so that with the head 20 in or
anywhere between the positions shown in Fig. 3,
the machine is inoperative either for jolting or
squeezing the ?ask. When squeezing, the hands
of the operative cannot be injured because they
are both in safe positions. When jolting, they
cannot be injured by accidental opening of the
main jolt valve because the arm and head are 20
wholly to one side of the path of travel of the
platform and ?ask.
Manifestly, either of the safety features rep
resented by the auxiliary valves 30 and 30' may
be employed without the other; but the maximum
safety of the machine is obtained by the use of
both.
The structural details of the auxiliary safety
valves and their operating devices may, of course,
be varied from those shown and described with 30
out departing from the principle of the invention
or sacri?cing any of its advantages. Hence, I
On the upper end of the hub l8 of the arm 19
reserve all such variations and modi?cations as
is a laterally projecting lug 44 shown in top plan
35 view in Figs. 2, 3 and 4, in which is mounted a
fall within the spirit and purview of the claims.
I claim:
striker screw 45 that lies in the same horizontal
1. The combination with a molding machine
of the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for raising said
platform, a platen head movable between posi
plane with the valve stem 42.
The spring 38 of the auxiliary valve 30 is of
su?icient strength to overcome the inertia of the
40 arm l9 and its head 20.
Brie?y describing the function and operation
of the auxiliary valve 30, when the operative is
ready to squeeze the ?ask, with his left hand he
grasps a handle 46 on the free end of the arm I9
45 and swings the latter from the off position shown
in Fig. 2 to the working position shown in Fig. 4.
During the latter part of this swing, the screw 45
strikes the projecting end of the valve stem 42
and forces the latter inwardly, unseating the valve
60 and admitting ?uid pressure to the portion of the
line. 22 beyond the valve. He then with his
right hand depresses the main valve handle 25
and holds the latter depressed until the squeezing
operation is completed. During this squeezing
55 operation it is necessary for him to hold the
head 20 in its working position (Fig. 4) since, if
he lets go, the valve spring 38 acting through
the stem 42 will push the head 20 to the in
operative position shown in Fig. 3. Thus, at
60 the inception of and during the ?ask squeezing
operation botl‘i hands of the operative are occu
pied in safe positions where neither hand can
become accidentally injured.
65
76
In the line 23 that serves the ?ask jolting
motor I also preferably interpose an auxiliary
valve designated as an entirety by 30’. As seen by
a comparison of Figs. 5 and 6, the valves 30 and
30’ are identical except that the spring 38' of the
valve 30' is weaker than the spring 38 of the
valve 30 and, in fact, is of insu?icient strength
to overcome the inertia of the head 20 and its
above said platform,
2. The combination with a molding machine
of the squeeze type having a ?ask supporting
platform, a ?uid pressure motor for raising said
platform, a platen head movable between posi 50
tions above and to one side of said platform, a
motive ?uid supply line for said motor, and a
manually operable valve in said line, of a nor
mally closed auxiliary valve in said line, means
whereby said auxiliary valve is opened when said 55
head is moved to and held in Working position
above said platform, and means automatically
moving said head out of working position and
permiting said auxiliary valve to close if and
when said head is not held'in working position. 60
3. The combination with a molding machine of
the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for raising said plat
form, a platen head movable between positions
above and to one side of said platform, a motive 65
fluid supply line for said motor, and a manually
operable valve in said line, of a normally closed
auxiliary valve in said line, said valve having a
stem projecting exteriorly of said line, means 70
whereby said auxiliary valve is opened through
On the arm I9 is a lug 4‘! that extends
contact with said stem when said head is moved
into the horizontal plane of the valve stem 42'
of the valve 30'. The valve 30’ is normally held
to and held in working position above said plat
form, and a spring closing said auxiliary valve and
closed by both its spring 38’ and the differential
through said stem shifting said head out of 75
arm l9.
75
tions above and to one side of said platform, a 40
motive ?uid supply line for said motor, and a
manually operable valve in said line, of a self
closing auxiliary valve in said line, and means
whereby said auxiliary valve is opened when said
head is moved to and held in working position 45
3
2,114,111
working position if and when said head is not
held in working position.
4. The combination with a molding machine of
the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for raising said plat
form, an arm pivoted to swing laterally above said
platform, a platen head on the free end of said
arm, a motive ?uid supply line for said motor, and
a manually operable valve in said line, of a nor
10 mally closed auxiliary valve in said line, said
valve having a stem projecting exteriorly of said
line, and a valve closing spring projecting said
stem into the path of swing of said arm whereby
the latter opens said valve when said head is
15 moved into working position, said spring being
strong enough to overcome the inertia of said
arm and head thereby requiring the latter to be
held in working position to maintain said aux
iliary valve open during the squeezing operation.
20
5. The combination with a molding machine
of the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for jolting said plat
form, a platen head movable between positions
above and wholly to one side of said platform, a
25 motive ?uid supply line for said motor, and a
knee-operable valve in said line, of a self-closing
auxiliary valve in said line, and means whereby
said auxiliary valve is opened and held opened
when said head is shifted to a position wholly to
30 one side, and out of the path of travel, of said
platform and ?ask.
6. The combination with a molding machine of
the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for jolting said
35 platform, an arm pivoted to swing laterally above
said platform, a platen head on the free end of
said arm, a motive ?uid supply line for said mo
tor, and a knee-operable valve in said line, of a
normally closed auxiliary valve in said line, said
40 valve having a stem projecting exteriorly of said
line, and a valve closing spring projecting said
stem into the path of swing of said arm whereby
the latter opens said valve when said head is
swung entirely to one side of said platform, said
spring being of insu?icient strength to overcome
the inertia of said arm and head, whereby said
valve remains open so long as its stem is con
tacted by said arm.
7. The combination with a molding machine of
50
the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for raising said plat
form, a second ?uid pressure motor for jolting
said platform, a platen head movable between
positions above and to one side of said platform,
motive ?uid supply lines for both of said motors,
a manually operable valve in the line serving
said ?rst-named motor, and a knee-operable
valve in the line serving said second motor, of
self-closing auxiliary valves in the respective lines,
and means whereby the auxiliary valve in the
line serving said ?rst-named motor is opened 1O
when said head is moved to and held in working
position above said platform, and whereby the
auxiliary valve in the line serving said second
motor is opened and held open when said head
is shifted to a position wholly to one side, and out 15
of the path of travel of, said platform and ?ask.
8. The combination with a molding machine of
the squeeze type having a ?ask supporting plat
form, a ?uid pressure motor for raising said plat
form, a second ?uid pressure motor for jolting
said platform, an arm pivoted to swing laterally
above said platform, a platen head on the free
end of said arm, motive ?uid supply lines for both
of said motors, a manually operable valve in the
line serving said ?rst-named motor, and a knee 25
operable valve in the line serving said second
motor, of a normally closed auxiliary valve in
the line serving said ?rst-named motor, said
valve having a stem projecting exteriorly of said
line, a valve closing spring projecting said stem 30
into the path of swing of said arm whereby the
latter opens said valve when said head is moved
into working position, said spring vbeing strong
enough to overcome the inertia of said arm and
head thereby requiring the latter to be held in 35
working position to maintain said auxiliary valve
open during the squeezing operation, and a nor
mally closed auxiliary valve in the line serving
said second motor, said last-named valve having
a stem projecting exteriorly of said last-named 40
line, and a valve closing spring projecting said
last-named stem into the path of swing of said
arm whereby the latter opens said last-named
valve when said head is swung entirely to one
side of said platform, said last-named spring be
ing of insu?icient strength to overcome the in
ertia of said arm and head, whereby said last
named valve remains open so long as its stem is
contacted by said arm.
HENRY O. MAGNUSON.
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