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Патент USA US3041669

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July 3, 1962
3,041,659
w. A. CLARK
RUBBER MIXER
Filed April 16, 1959
2 Sheets-Sheet 1
FIG. I
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1' INVENTOR.
WILLIAM A. CLARK
ATTORNEY
Unite sStates
"ice
stem 1
p
3,941,659
Patented July 3, 19452
1
meet in a straight line at each end of the door, these sur
faces ?tting tightly against correspondingly shaped sur
3,041,659
RUBBER MIXER
faces provided upon the end walls of the chamber and
.
William A. Clark, Port Credit, Ontario, Canada, assignor
providing a clearance at an intermediate point.
Yet another object of the invention is to provide an
of ?fty percent to The Goodyear Tire & Rubber Com
pany, Akron, (ihio, a corporation of Ohio, and ?fty
percent to Skinner Engine Company, Erie, ha, a cor
improved mixer door according to the above descrip
tion wherein the intermediate part of the door has ?at
poration of Pennsylvania
Filed Apr. 16, 1959, Ser. No. 316,659
7 Claims. (Ci. 18-2)
surfaces which meet in a curved line in-between the ?at
end surfaces which form a seal between the door and
the chamber of the machine.
ticularly, to rubber mixers of the Banbury type. The
invention is particularly concerned with the provision of
an improved ‘form of door for the discharge opening at
the bottom of the chamber of such a mixer.
15 door converge to an apex at the ends thereof.
Mixers of this type comprise what is usually referred
to as a double cylinder chamber.
'
A further object of the invention is to provide an im
proved door wherein the two ?at surfaces of the inter
mediate part of the door end at a ?at planar horizontal
intermediate surface thereof and the end surfaces of the
This invention relates to rubber mixers and, more par
_
With the above and other objects in view, the present
invention consists of the combination and arrangement
of parts hereinaftermore fully described, illustrated in
the accompanying drawings and more particularly point
ed out in the appended claims, it being understood that
changes may be made in the form, size, proportions, and
The chamber con
sists of two cylinders placed side by side with their axes
parallel horizontal relation, the cylinders communicating
with each other at the portions thereof lying between
their axes. A rotor is provided in each of the cylinders,
minor details of construction without departing from the
each of the rotors being provided with blades, the tips
of which approach closely to the walls of the respective
spirit or sacri?cing any of the advantages of the inven—
cylinders as they rotate. The chamber formed by the
tion.
two communicating cylinders is provided with a bottom 25 In the drawings:
FIG. 1 is a side elevational view of a mixer embody
discharge opening at its center which extends lengthwise
across the center and a sliding door is provided to- close
ing the invention, some parts thereof being broken away
this opening so that after a batch ‘of rubber or other
plastic material has been treated in the machine by the
rotating cylinders, the door may be moved outwardly to 30
of FIG. 1;
'
-
FIG. 3 is an enlarged sectional view/similar to that
an open position to allow the batch of material to drop
‘by gravity from the chamber.
shown in FIG. 2;
In the past, doors of this type have been formed with
a smooth upper surface to ?t tightly against the sides of
the openings in the cylinders with a su?icient clearance
to allow the door to operate.
to show the interior of the mechanism;
‘
FIG. 2 is a cross sectional View taken on line 2-2
-
FIG. 4 is an isometric view of the improved door;
FIG. 5 is a cross sectional view of another’
embodi- _
ment of the invention;
FIG. 6 is a cross sectional view of still another em
'
Doors of prior mixers of this type were made with the
above mentioned clearance because it was found that
with any less clearance, the doors were galled by the
bodiment of the invention; and
‘FIG. 7' is a view of another embodiment of the inven
tion.
_
rollers during opening and closing of the doors. By 40 Now with more speci?c reference tov the drawings,
FIGS. 1 to 4 inclusive show a mixer comprising a cham
providing the improved door, the end seals can be made
ber 10 having a charging stack 11 at the upper portion
tight and, yet, the clearance between the door and roll
thereof. The charging stack 11. is provided with end
ers can be made of a desirable magnitude'and galling
during opening and closing of the door can be elimi
walls 12 which are continued downwardly to form the
45 end walls or end plates for the chamber 10..
nated.
The chamber 10 is of the double cylindrical type con
In these mixers, it is necessary that the cylinder rotate
sisting of two cylinders 13 and 14, in each of which is
in close proximity to the upper surface of the discharge
mounted a bladed rotor 15. The cylinders 13 and 14
door in order to perform a thorough job of mixing;
communicate with each other at their adjacent portions
however, there must be a clearance between the cylinder
so as to form a chamber of substantially double cylin
and the door in order for the machine to operate satisé
drical shape. At the lower portion of the chamber and
factorily. It is also desirable to have the end surfaces
at the central portion thereof is provided a discharge
of the door where they form a seal with the side of the
opening 16. ,The opening 16 is closedby a ‘door 17
frame of the machine formed of ?at surfaces converg
which is slidably mounted to be moved to an open and
ing at a point in order to conveniently provide a thoroughv
seal at this point.
55
It will be understood that these machines are often 0p
erated under considerable pressure, the pressure being
applied either by a forward plunger or ?oating weight
mounted in the charging stack. It is necessary, therefore,
thatthe door ?t tightly at all engaging surfaces to form
a complete closure for the chamber and to prevent leak
age of the material therethrough.
It is, accordingly, an object of‘the present invention
to provide a new and improved mixer for plastic mate—
rials.
,
Another object of the iuvention'is to provide a mixer
for plastic materials having a bottom discharge opening
and a novel form of door for closing the opening.
Still another object of the invention is to provide a
mixer for plastic materials of the type described, the
chamber of the mixer comprising a movable door or
closure member having two ?at upper surfaces which
a closed position.
. '
a
The door ‘or-closure member 17 is keyed or otherwise
secured to a cylinder 18. The cylinder 18 is ‘provided
with wings 1'9 adapted to extend laterally over ways 20.
The ways 20 are provided on lower base portions 21 of
60 the chamber 10. The door 17 is adapted to be moved
to open and closed positions by means of ?uid pressure
introduced into opposite ends of the cylinder 18. -The
?uid pressure works against a piston 23 mounted on a
piston rod 24. The outer end of the piston rod 24 is
As
the piston .23 is thus ?xed against longitudinal movement,
65 rigidly held in a base portion 26 of the mixer at 25.
the introduction of ?uid pressure upon one side or the
other of the piston 23 will affect movement of the cylinder
18 and the door 17 selectively in opposite directions to
open and closed positions.
It will be noted that a line 36 which denotes the apex
of the intermediate part of the door or closure member 17
3,041,659
_
~
,
4
~
.
is- considerably below an upper line 35 of the end portions
of» the door 17. This may be, for example, at_a- clear
ance distance‘of .010" therefrom. It is necessary for the
I closure member for said opening, the upper side of said
member comprising two plane surfaces meeting at a line
rotor to clear the door by approximately .010 inch during
ing inwardly from the side edges of, said closure member
to'a ridge, said ridge lying between the blades of said
substantially centrally of saidchamber, the surfaces slop
operation. , By relieving the intermediate, part of the
door between the ends, the rotor can- have the proper op
rotors and in a horizontal plane intermediate the‘ plane
of said rotors and the lower portions of the cylinders,
downwardly disposed surfaces on said mixer at the ends
yet, the ends of the ‘door will ?t against the ?xed machine
of’ said chamber lying in planes tangent to said cylindrical
frame as ‘tightly as if the rotor cleared the door by only
.005 inch; Therefore, the rotor can rotate freely’ at a .10 chamber and adapted to cooperate with said closure mem~
erating clearance between its periphery and the door and,
her to form a closure, the upper sides of said member at .
" proper clearance; yet‘ a minimum clearance is provided
between the'ends of the door and the machine frame so
the ends thereof being parallel to the intermediate por
that a minimum amount of material can escape between
the door. and the frame. Formerly, with doors‘such as .
tions and disposedlalshort distance thereabove, said upper
sides being adapted to be in close proximity to said down
wardly. disposed surfaces.
disclosed in Patent ‘No. 2,615,689, there had to be .010
'inch'cl'earance between the door and theframe'in order
to provide the proper clearance between the rotor and the
_. door. , Therefore, considerable material could leak out
between the ends of- the door and the rotor.
‘
2. Amixer for heavy plastic’ materials comprising a
double cylindrical chamber having a bladed rotor in
each of the cylinders thereof, said chamber being provided
with I a common discharge opening, and a movably
In the pres
ent design, leakage of dust and compounds is reduced, yet
mounted closure member ‘for said opening, said member
the rotor can have the proper clearance between it and
closing of the cylinder 18 and the door 17 as with doors
having a sharply de?ned ridge upon its upper surface and
downwardly sloping plane areas on each side of said ridge,
said chamber being provided with end walls having lower
having the greater clearance.
surfaces ?tting snugly against said plane areas, said ridge
‘the door, yet permitting the, same case of opening and
‘
.
i
The top surfaces of the door 17 provide a‘ surface for 25 being‘parallel to the axes of said rotors and being dis
posed between the blades of said rotors and a substantial
engaging the material being mixed so that’it ?ows there
distance below the planes of said axes, the upper sides of
around with a minimum of frictional loss and, therefore,
said member at the ends thereof being parallel to the in
- In the embodiment of the invention shown in FIG. 5,‘. 30 termediate portions and disposed a short distance there
above.
a door 117 is shown with side surfaces 133 and 134 at the
3. A mixer for heavy plastic materials comprising a
intermediate part thereof. The side, surfaces 133 and
double cylindrical chamber having a bladed rotor in each
‘134 meet an intermediate horizontal surface 136. End
. of the cylinders thereof, said chamber being provided with
surfaces 131 and 132 are raised from the surfaces 133 and
134 by approximately, .010 inch and these surfaces meet 35 a bottom discharge opening, and a slid-ably mounted clo
sure member for said opening, the upper side of said mem
at an apex 135 so that the surfaces 131 and 132 form a
ber comprising two plane surfaces meeting at a line sub
firm seal withrthe'end frames of the machine; The cyl
provides a smoother operating machine.
stantially centrally of said chamber, said surfaces sloping
‘ inder, therefore, can be operated at a smaller clearance
to the surfaces 133 and ‘134 than would be possible with- ‘ upwardly from the side edges of said closure member to
out the. end surfaces being built‘ up as shown; The'horif 40 a horizontal surface, said horizontal surface lying be
tween the blades of said. rotors and in a horizontal plane
.zontal surface 136 allows room above the door 117' for
additional mixing action of the material being mixed
7 intermediate the plane of said rotors and the lower por
tions of said cylinders, the upper sides of said member
, In the embodiment of the invention shown in FIG. 6,
end surfaces 231 and 232 are built up approximately .010 ' ‘ at the ends thereof being parallel to the intermediate por
in'ch‘above intermediate surfacesf233 and234. A door 45 tions and disposed a short distance thereabove.
4. A mixer for heavy plastic materials comprising a
217 is. provided which is, in general, like the doors 17
. and 117 shown in FIGS. 1 to 5; however, the surfaces 233 V
double cylindrical chamber having a bladed rotor in each
and 234 converge into a curved upper top surface 236.
The curved surface 236 makes possible a smoother op.
of the cylinders thereof, said chamber being provided with
a'bottom discharge opening, and a slidably mounted clo
e'rating machine, reduces the friction of the-material be
sure member for said opening, the upper side of said
ing mixed over that shown in Qmachines shown in the
prior art and, therefore, provides a more ef?cient mixing
member comprising two plane surfaces meeting at a line
action.
1
'
substantially centrally of said chamber, said surfaces slop
ging upwardly from the sideredges of said closure mem
ber to a curved surface, said curved surface lying between
the blades of said rotors intermediate the plane of said
'
_In FIG. 7, another embodiment of the invention is
shown constituting a radiused door using the improved
structure thereof. A door 317 has radiused surfaces 333
and 334 out down approximately .OOS’inch below surfaces.
_ rotors and the lower portions of said cylinders, said side
331 and‘332. The door 317 has the'upwardly curving
said member at the ends thereof being parallel to the in
termediate portions and disposed a short distance there
edges merging into said curved surface, the upper sides of
, side’ surfaces 331 and 332 terminating at a ?at surface
01)
335. Theintermediate part of the top surface 336 of
galling during opening of the. door 317.
The ‘foregoing speci?cation sets forth the invention in its
of, the cylinders thereof, said chamber being provided
closure member for said opening, said chamber being pro
vided with end walls having lower surfaces ?tting snugly
against plane areas of a ridge, said ridge being parallel to
a is broadly novel as is commensuraterwith the appended
_
'
.
.
the axes of said rotors and being disposed between the
blades of said rotors and a substantial distance below the
plane of said axes, the upper sides of said member at the
I
The embodiments of the invention in which an exclu
sive property or privilege is claimed are de?ned as fol
.
lows:
.
V l. A mixer for heavy plastic materials comprising a
‘double cylindrical chamber having a bladed rotor in each
of the cylinders thereof, said chamber being provided
with a bottom discharge opening, andaslidably mounted
'
with a bottom discharge opening, and a movably mounted
preferred. practical forms but the structure shown is ca
p'able of modi?cation within a range of equivalents with.
out departing from the invention which is to be understood
claims.
above.
5. A mixer for heavy plastic materials comprising a
double cylindrical chamber having a bladed rotor in each
the door 3'17 is cut down or relieved, thus eliminating
'
ends thereof‘being parallel to the intermediate portions
and disposed a short distance thereabove.
6. .A mixer for heavy plastic materials comprising a
double cylindrical chamber having a bladed rotor in each
of the cylinders’ thereof, said chamber being provided
3,041,659
with a bottom discharge opening and a movably mounted
closure member for said opening, said member having
downwardly sloping plane areas on each side thereof,
said chamber beingprovided with end walls having lower
surfaces ?tting snugly against said plane areas, a ridge,
said ridge being parallel to the axes'of said rotors and be
ing disposed between the blades of said rotors and a sub
- surfaces sloping upwardly fromthe side edges of said clo
sure member toga ridge, said ridge lying between the blades
of said rotors and in a horizontal plane intermediate the
plane of said rotors and the lower portions of said cyl
inders, downwardly disposed surfaces on said mixer at the
ends of said chamber lying in planes tangent to said cylin~
drical chamber and adapted to cooperate with said closure
stantial distance below the plane of said axes, the upper
member to form a closure, the upper sides of said mem
sides of said member at the ends thereof being parallel
her at the ends thereof being parallel to the intermediate
to the intermediate portions and disposed a short distance 10 portions and disposed at short distance thereabove, said
thereabove.
/\
'
upper sides being adapted to be in close proximity to said
7. A mixer for heavy plastic materials comprising a
double cylindrical chamber having a bladed rotor in each,
of the cylinders thereof, said chamber being provided with
downwardly disposed surfaces.
References Cited in the ?le of this patent
a' bottom discharge opening, and a slidably mounted clo 15
sure member for said opening, the upper side of said
member comprising two convex surfaces generally co~
extensive with the outside surfaces of said rotors, said
"
UNITED STATES PATENTS '
1,836,355
2,615,689
2,725,220
I
Banbury ____________ __ Dec. 15, 1931
Schnuck et a1. ________ __ Oct. 28, 1952
Hale et al. __________ __ Nov. 29, 1955
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