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Патент USA US2135372

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Nov; 1, 1938.
Filed May 20, 1937
2 Sheets-Sheet 1
NOV. 1, 1938.
Filed May 20, 1957
2 Sheets-Sheet 2
Patented Nov. 1, 1938'
Raymond H. Wiehsner, Philadelphia, Pa., assignor
to The Tabor Manufacturing Company, Phila
delphia, Pa., a corporation of Pennsylvania
Application May 20, 1937, Serial No. 143,682
1 Claim. (01. 22—47 )
The present invention relates to improvements
in molding machines, more particularly of the
drop pattern type.
The principal object of the present invention
5 is to provide simple, reliable and e?icient mech
anism for automatically holdingthe ?ask frame
in elevated position while the pattern plate is
dropped, and to provide simple, reliable and
e?‘icient means for permitting the ?ask frame
to be lowered to its normal position. Another
object is to so construct and arrange the parts
that the machine may be operated as a ?ask
lift machine; or, in other words, to provide a
machine which can be operated at will either
as a pattern drop or ?ask lift machine.
Other objects of the invention will appear
from the following description at the end of
which the invention will be claimed.
Generally stated, the invention consists in an
20 oscillating latch mounted on the head of the
machine and adapted to stop the down travel
of the ?ask frame automatically and to be re
set manually. The invention also comprises
the improvements to be presently described and
?nally claimed.
In the following description reference will be
made to the accompanying drawings forming
part hereof and in which:
Figure 1 is an elevational view partly in cen
tral section illustrating a molding machine em
bodying features of the invention.
Fig. 2 is a side elevational view of the same;
Fig. 3 is a top or plan View illustrating in
' dotted lines, as well as in full lines, a latch em
bodying features of the invention.
Referring to the drawings, l indicates a ?ask
frame and 2 indicates a drop plate or drop pat
tern plate. These parts are movable upwards
and downwards as a unitary structure, and also
as separate units. There is nothing particularly
new about this and the means for this purpose
in the embodiment selected for illustration from
among other embodiments will be described.
45 The frame of the machine is provided with a
squeezer cylinder 3 and piston 4. The piston
4 carries the pattern plate 2 thru the interven
tion of the elements 5. The piston 4 also car
ries the guide cylinder 58 and center draw
50 plunger 6.
The plunger 6 carries the stool
plate 1 and stool structure 8, to which is con
nected the ?ask frame I. The ?ask a, mounted
on the ?ask frame I, and properly ?lled with
sand and with all the other parts in the posi
55 tions shown in the drawings can be lifted against
the ramming block 9 carried by the yoke I0 so
as to squeeze or otherwise ram the sand.
is done by the introduction of ?uid under pres
sure into the cylinder 3 by way of the port ll. ..
The ?uid pressure raises the piston 4 and all of
the parts connected therewith. In drop draw
ing the pattern, the ?ask frame I and ?ask a,
are arrested in their descent and the rest of
the structure descends as above described.
The .
centre draw guide cylinder 5E‘L and plunger 6 10
may contain oil and they operate to guide the
pattern plate in its descentand the oil limits
its speed. The guide pin l2, Fig. 2, serves
a like guiding purpose. Having thus indicated
certain parts of one type of molding machine to 15
which the invention is applicable a description
of the latter will now be given.
i3 are screw stops operatively held ?xed by
brackets l4 connected to the cylinder 3, or to
some ?xed part of the machine. The cylinder 20
3 supports the stool plate 1 and ?ask frame
when the parts are in lowest position as shown
in Fig. 1. I8 is a latch centrally pivoted, spring
pressed and arranged for oscillation. As shown
the latch I8 is pivoted to the neck of the plunger 25
6 and it is pressed by a spring l5, or other suit
able device such as a pneumatic device.
movement is limited by stops I6 and I1, Fig. 3.
The ends of the latch l8 are, when the parts
are in the position shown in Fig. I, pressed 30
against opposite faces of the side walls of the
screw stops 13 which do not contact with stool
plate ‘I. When the structure carried by the
piston 4 is raised to bring the sand in contact
with the ramming block 9 the latch I8 is car 35
ried upward until its ends clear the screw stops
l3, whereupon it is turned by its spring l5 or
pneumatic device into line with the tops of the
screw stops I3 and against its stop IS. The
latch remains in this position during the upward
movement of the parts carried by the piston 4.
Upon downward movement of the piston 4 the
ends of the latch l8 which are shown as pro
vided with pads l9 rest upon the upper ends
of the screw stops I3 and under the stool plate 45
‘I and in that way check the descent of the ?ask
frame and ?ask a. During further descending
movement of the piston 4, the guide plunger 6,
by reason of its weight and load, moves in its
cylinder and the pattern plate 2 descends draw 50
ing the patterns out of the ?ask a. The oil in
the cylinder 5a checks and regulates the speed 7
at which the pattern is drawn from the sand.
The ?ask a, having been removed from the ?ask
frame the latter is returned to its initial posi 55
tion by moving the ends of the latch l8 oif the
ends of‘ the screw stops I 3 and against their
lateral faces ready for another operation. This
is done by means of a counterbalanced foot lever
20 having an arm 2| which projects into range
of an extension v22 on the latch I8.
’ ‘ In the foregoing description reference has been 7
’ made to dropping the pattern out of the ?ask;
~ from the cylinder 5a
through the hole at 24 into
the cylinder 4, and when the machine is used as a
?ask lift machine air pressure is put upon the oil
in the cylinder 4 and-oil under pressure passes
through the hole at 24, and piston 6 andparts:
carried thereby are lifted.
It will. be obvious to those skilled in the art"
to which the invention relates that modi?cations
however the ?ask can be lifted off the pattern. may-be made in details of construction and ar
10 In fact the machine can be operated'either way; rangement without departing from the spirit of 10
To lift the ?ask from the pattern,>the latch I8
p the invention whichis not limited as to such mat- 1‘
is held out of action or permitted to’ remain out
ters or otherwise than the prior state of the art
of action, for example by releasing the spring
and the appended claim may require.
IS, the piston 4 is in the position shown in the
15 drawings and pressure is applied to the piston 6
I claim:
A latch for a molding machine having a "sta
" in order to lift it along with the ?ask frame I.
' tionary frame, a ?ask frame structure movable e'
One way to do this is to dispense with the hole relative to said‘frame and a drop pattern plate
23, and to provide a hole in the lower wall of the
structure movable relative to said frame, said
cylinder 5a,rfor example, at the point indicated
latch comprising, in combination, adjustable
piston 4, is ?lled with oil'to the top of which pres
sure is applied to lift the piston 6, and the pres
sure is relieved to permit the piston 6 to descend
frame structure, a latch pivotally mounted on said 7
20 at 24, and in that case the space inside of the ' screw stops mounted on said stationary frame and 20
at regulated speed.
having their tops underlying portions of said ?ask
?ask frame structure and having portions ar
ranged to contact with the sides of saidrscrew
It will be understood that when the machine is ~ stops or to be interposed between the tops of said
to beoperated asa pattern drop machine only, screw stops and said ?ask frame structure so as
7' the oil may be con?ned to‘the cylinder» 5a'and to to support said ?ask frame structure, means
e the hollow piston 76, and by ?owing through the V stressing said latch‘aboutits pivot towards said ‘7
' hole 23 it regulates the descent of the plunger 6 screw stops, stops limiting the pivotal movement of
30 and parts carried thereby. Whenthe machine said latch about its pivot,- and a counter-balanced 30
7 is t'obe used either .as a pattern drop or flask lift foot-operated lever mounted on said stationary
machine the hole 23 is replaced by a hole at 24 and v frame and having a portion arranged for engage
the cylinder 4 is ?lled with oil. When the ma V ment with a portion of said latch andoperable to
chine is intended for convertible use, and is being
35 *used as a pattern dropmachine, the oil ?ows
move said latch against'the stress of said means. '
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