Патент USA US2402931

Patented June 25, 1946
2,402,931
_UNITED STATES PATENT foFFlcE
....lcîhîîîïìîîfïïîïîm.
3 Claims.
1
(Cl. 62-114) ’
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This invention pertains to an ice cream ma
_' chine, used in the continuous production of ice
cream or frozen confection, wherein a suitable,
mix is introduced at one end of the machine and
the frozen productv in edible condition is dis
charged at the other end thereof.
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2
In the drawing there is illustrated a machine
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This invention is more particularly directed to
a. mechanism which will continuously> process an
ice cream mix by centrifugally maintaining the
particles of the mix in a thin film about a freezing
embodying the invention comprising a base I0
for supporting a horizontally-disposed cylindrical.
housing I I. Said housing embraces at one end
a minorcompartment t2 separated from a maior
compartment I3 by a separating wall I4. The
maior compartment I3, between the wall I4 and
the discharge end of the machine,- _encloses a
refrigerating or freezing cylinder I5, said lcylin
der -being provided with‘a pair of. spaced con
centric walls between which refrigerant carrying
surface and continuously scraping or peeling thev
thin frozen film> produced thereby from said . tubes or passages I6 are provided. Mounted axi
freezing surface, and carrying it by such scrap
ally of the cylinder I5 for rotation therein, there
ing and peeling action to the discharge end of
is a 'drive shaft I 'I supported by a bearing I8 at
the machine, whereupon it is discharged in fin .6 the discharge end of the housing II and by bear
ished edible form. As a result of such action the
ing I9 in the partition wall I 4.
finished product is developed with a velvety tex
ture of only approximately twenty-five percent
.
0n the extension of the shaft I'I there is pro
I vided a driving pulley 20 mounted in the com
overrun as compared with the usual ñfty percent
partment I2 and driven by a belt 2| from a motor
overrun, but without being compressed, packed 20 22 supported upon a frame 23 in the base of the
or re-frozen. Thus the product maintains its
compartment I0. The motor drive and belt are
original soft texture as compared with a frozencrystal texture of the higher overrun re-frozen
ice creams.
so designed as to drive the shaft I1. at about 350
R. P. M. Also, mounted within the base I0 there
is a. compressor 24 connected with the refrigerant
'I'his mechanism is so designed that the ice 25 passages or pipes I6 for refrigerating the internal
cream mix is kept in constant motion on the
freezing surface of the freezing cylinder I5. In
freezing wall of the machine, and the layer of
mix on the wall is such as to eñ’ect proper heat
transfer at such a rate that the freezing time is
reduced to a minimum., The pitch of the scrap
ing and feeding blades, and the angular velocity
this connection, it is desirable to maintain the
inner freezing surface of said cylinder at approxi
mately ñve degrees Fahrenheit.
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The ice cream or frozen confection mix is con
tained in avessel 25 mounted on the top of the
housing II and communicating with a hopper 2B
through an oriñce'controlled by a valve 21. The
hopper 26 communicates With the interior of the
instant freezing is completed.
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35 cylinder I5 through a discharge opening 28 in
'I'he period that the product remains in the
the partition wall I4. At the other end or dis
machine is estimated to be from ten to fifteen
charge end of the cylinder there is a diaphragm
seconds within which time full freezing of the
supporting the bearing I8 in which there is a dis
product is completed, instead of the eighteen to
charge orifice 3|! communicating with an exterior
of said blades is such that the mix is moved
parallel to the axis of the-mechanism at such
velocity as to arrive at the discharge end at the
forty-eight hours formerly required to freeze ice
cream. Thus, the freezing time, with the con
sequent crystal growth, is greatly reduced.
'I'he full nature of the invention will be under
stood from the accompanying drawing and the
following description and claims:
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Fig. 1 is a central longitudinal section through
the machine.
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Fig. 2 -is a section taken on the line 2_2 of
Fig. 1.
v
ly and forwardly extending discharge spout 3I.
The shaft I1 carries within the major portion
of the cylinder a series of dìametrically opposed
scraper blades 32 extending at an angle to the
shaft with their outer edges curved to conform
' and lie adjacent the inner wall of the cylinder
I5 to effect a scraping action about the freezing
surface. Each blade is carried by a hub 33
through a reduced end portion 34, said hub being
keyed or otherwise secured to the shaft I 1 for
Fig. 3 is a section taken on the line 3-3 of 50 rotation-therewith. The length of the respective
Fig. 1.
hubs is such that they abut each other end to
Fig. 4 is a side elevation of the scraper blade
- end, each adjacent hub carrying its blade at about
with its bearing in section.
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a sixty degrees angle to the preceding and fol
Fig. 5 is an enlarged section taken on the line
lowing blade. As shown herein there are six such
5_5 of Figui.
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vb. blades carried by the shaft in overlapping rela
2,402,9s1
3
4
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tion relative to each other, progressively spaced
at sixty degree intervals about the shaft and
freezing wall of the cylinder. The rearwardmost
blade rotates adjacent the wall Il to pick up the
mix as it is introduced into the cylinder through
the orince 28.
By centrifugal force due to the rapid rotation
said shaft in staggered relation, each of said
blades being biased to extend at an angle to the
axial center of said shaft and formed with a
concave scraping face curved to conform with
the cylindrical surface of said chamber, means
for directing the mix to bevfrozen into one end
thereof, the _mix is spread about the freezing
of said chamber to be scraped by said blades
along the wall of said chamber toward the other
wall in a thindllm, suchthat it is rapidly frozen.
end thereof, and means for continuously dis- -
the mix not only maintains it in freezing con
a cylindrical freezing chamber for continuously
along the freezing wall to the forward or dis
tion at the other end thereof, a shaft rotatably
But such frozen nlm is continuously scraped by 10 charging the frozen confection from said ‘last
mentioned end of said chamber.
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the respective blades, and due to their angular
2. A machine for producing an edible frozen
disposition carried forwardly from one blade to
the next. Thus.- the centrifugal force applied to ' confection in a continuous operation, including
receiving at one end a mix to b_e frozen and
tact with the wall of the cylinder. but itis caused
to constantly` move ,thereabout and forwardly ‘ continuously discharging edible frozen confec
charge end.
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mounted axially of said cylinder, means for rotat- '
ing said shaft, and a series of scraper blades
progressively mounted along said shaft to extend
at an angle to the axial center thereof and in
a helical feed; screw I5 keyed to and rotatable
scraping relation with the surface of said cham
with said shaft for gathering the frozen mix
ber, each of said blades extending through an
and feeding it through the discharge oriñce l0
arc adjacent the surface of said chamber and
'into the spout' 1,3 Il. Within said spout there is also
provided a helical »feed screw 38 keyed to and 25 in staggered relation to each other with the com
bined arcs through which the staggered blades
rotatable wltli‘ said shaft. which -receives and
extend co-extensive with the circumference of
carries the ñnished product forward for discharge
At vthe discharge end of the cylinder and ad
jacent the forwardmost of said blades there is
from the machine.
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said chamber.
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3. A machine for producing an edible frozen
In view of the above, it will be notedthat the
confection in a continuous operation, including
mix is maintained at all times distributed about
a cylindrical freezing chamber for continuously
the freezing wall of the cylinderin a thin nlm
receiving at one end a mix to be frozen and con
such that theparticles will freeze upon being
tinuously discharging edible frozen confection at
thrown» against said freezing surface. vbut which
the other end thereof, a shaft rotatably mounted
are constantly being scraped or peeled therefrom
and moved forwardly from one scraping blade to 35 axially of said chamber, means for rotating said
shaft, a series of scraper blades mounted in stag
the next while maintained in contact with the
gered relation along said shaft to be rotated
freezing surface by centrifugal force. Such cen
trifugal forceg‘keeps the frozenv particles moving
0f the freezing wall until they are
gathered by the, discharge screw 3! and.. fed there
by. from the machine., Thus, the mix is so frozen
as it emerges~ fromgthe machine that it is im
mediately infe'dibie condition and requires no
further freezing4v action.
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V’I‘l'ieinvention claimed is:
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_,1. -Aimachlr'ie for producing. edible frozen ,con
faction' in_eontinuous operation, including a cylin
dricalA freezing -chalutier' for continuouslyv receiv
irß at one end a mix to« be frozen and> con-à
thereby, said blades extending at an angle to said -
shaft and curved to conform to the curvature of
said chamber throughout their length, a hopper
communicating with one end of said chamber
through which material to be mixed is continu
ously introduced therein to be simultaneously
scraped from and conveyed along the wall of
said chamber toward a discharge end thereof. a
discharge screw mounted on said shaft adjacent
theA discharge end of said chamber and a. dis
charge feed screw extending from the end of said
shaft for receiving and continuously discharging
w- the frozen mix conveyed thereto by said scraper ,
blades and feed screw.
the otherend -thereof, a motor driven shaft
tinuously..
u
u - 1 edible frozen confection at
mounted forrotation
of said chamber.V a
series of‘ scraper blades mounted radially about
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FRANK THOMAS.