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Oct; .29, 1946;
W. 'H. KITTO
_ 2,410,292
REFRIGERATION
Filed Feb. 26, 1938
'
.
INVAENTOR
M11121}; 12 [(2110
ATTORNEY
Patented Oct. 29, 1946
2,410,292
UNITED STATES PATENT OFFICE
2,410,292
REFRIGERATION
William H. Kitto, Canton, Ohio, assignor to The
Hoover Company, North Canton, Ohio, 2:. cor-i
poration of Ohio
Application February 26, 1938, Serial No. 192,723
12 Claims.
((31. 62.—108..5,)
1
2
This invention relates to refrigeration and
applied to the mechanism to release a single
group of ice cubes.
more particularly to a means for removing ice
cubes from domestic refrigerator trays.
It is a further object of the invention to pro
vide an ice cube release mechanism character
ized by’ the fact that ice cubes are progressively
released as a manual lever is moved through its
range of movement, and the entire grid is then
moved relatively to the tray by the same move
In the past it has been customary to remove
,ice cubes from domestic refrigerator trays by
melting the cubes loose from the trays or by
means of a linkage mechanism which severed
the bonds between the cube and the walls of the
individual cube compartments. However, much
ice was lost by the method of melting the ice
cubes free from the ice cube tray, and the cubes
so released were not only reduced in size, but
they had a slick wet surface. Previous mechan
ical devices designed to release ice cubes from
the walls of the ice cube compartment have not
been satisfactory by reason of the fact that they
do not loosen the cube completely and require
‘
ment.
It is another object of the invention to provide
an ice cube release mechanism which simultane
ously imparts to the cube to be released move
ment in directions at angles each to the other.
It is another object of the invention to provide
an ice tray release mechanism in which the ice
cubes to be released are moved‘ in a direction to
separate the same entirely from the ice tray as
excessive forces or impractical complex mech
they are being released.
anisms to achieve the desired end.
It is a further object of the invention to pro~
Accordingly, it is an object of this invention to 20 vide an ice cube release mechanism which si
provide a mechanism which will readily and pos
multaneously moves an ice cube to be released
itively release ice cubes from the surrounding
into a zone having a volume greater than the vol
walls of the ice cube compartment without re
ume of the ice cube and simultaneously imparts
quiring the operator to apply excessive forces
movement to the ice cube in such large volume
and which may be embodied in a simple, easily 25 zone.
'
manufactured mechanism.
It is a further object of- the invention to pro
According to the invention, there is provided an
vide an ice cube release mechanism character
ice tray within which rests a grid forming a plu
ized by the fact; that the ice cube is caused to
rality of ice cube compartments. Ice cubes are
move in a generally vertical direction while riding
released from each compartment by inducing a
along the surface of a plane inclined slightly
relative movement between the walls of the
from the vertical.
compartment and the cube contained therein.
It is a further object of the invention to pro
More speci?cally, a simple mechanical mecha
vide an ice cube tray release mechanism which
nism is provided which operates to move some of
simultaneously applies a Wedging action to one
the walls of the ice cube compartment relatively 35 or more faces of the ice cube undergoing release.
to the other walls thereof whereby the bond
Other objects of the invention will become ap
between the ice cube and the walls of the com
parent as the description proceeds when taken in
partment is broken. In one form of the inven
connection with the accompanying drawing, in
tion, movement of one wall of each ice cube com
which:
partment induces a movement of the ice cube
Figure l is a perspective view, partly broken
relative to another wall of the compartment and
away, of an embodiment of the invention, and
one of the Walls of the compartment is designed
> Figure 2 is a longitudinal sectional view of the
to force the cube to move relatively to the mov
device shown in Figure 1;
ing wall in order that the cube may be freed com
Figure 3 is_ a fragmentary view illustrating a
45
pletely from every wall to which it adheres.
modifmationl.
It is a further object of the invention to pro
Figure 4, is a fragmentary view illustrating an
vide an ice cube release mechanism in which the
other modi?cation. '
total force applied to the release mechanism is
The embodiment of the invention, herein, dis
applied directly and entirely to individual groups
of ice cubes through a leverage mechanism, and 50 closed comprises a metal ice tray ill adapted to
in which a plurality of ice cubes are released pro
gressively by a single movement as force is con
tlnuously applied to the releasing mechanism
whereby the total force applied at any given in
stant need only be equal to that necessary to be
be inserted in the freezing compartmentv of a
domestic refrigerator, and is provided with a.
bottom wall H, front and rear walls 12 and. I3,
respectively, and side walls ill. The front and
. sidewalls of the tray are inclined upwardly and
2,410,292
3
outwardly and terminate in a laterally outwardly
extending rim [5.
4
from the front to the rear of the tray, and there
after the cam 4| engages the cam seat 42 to raise
the grid it. The grid assembly is removably sup
ported in the tray by means of open-topped bear
wardly tapered partition H and transverse plates 5 ings 45 formed in the end walls of the tray to
accommodate a lateral extension 48 on the lever
l8, I9, 29 and 2 l. The transverse plates and cen
43 and a portion 41 of the rearmost projection 35
ter partition cooperates with the tray to form
on the center partition I1.
pairs of ice cube chambers 22, 23, 24, 2'5 and 28
In order to loosen the ice cubes from the grid
on opposite sides of the partition H. Partition
Removably disposed in the tray I0 is a grid
it which includes a central upwardly and out
I‘! is provided with slots 21 to loosely and slidably 10 and tray, the lever 43 is rotated through a verti
cal arc of substantially 186° until it rests on the
rim I5 of the side wall of the tray opposite to the
position shown in Figure 1. Rotation of the lever
43 causes the cam 38 at the front of the tray
to engage the upper de?ning edge 39 of the open
ing 48 in the transverse plate l8 and raises the
receive the unbroken portions of the transverse‘
plates, the latter being provided with slots at their
lower ends for loosely and slidably receiving the
unbroken portions of the partition l1, whereby
the transverse plates and the partition may be
moved with respect to each other.
As shown at 2B in Figure 1, the upwardly and
outwardly tapered partition is undercut to re
ceive the portions of the transverse plates adja
cent their upwardly extending slots. In Figure 2
the transverse plates I8, i9, 29 and 2| are broken
away to show the cooperation of these plates with
latter with respect to the partition I‘! and the
tray 50. Raising the transverse plate 18 causes
the ?ange 33 to lift the ice cubes in the cham
bers 22, 22 to free the ice cubes from the adja
cent walls of the tray. As the ice cubes in the
chambers 22, 22 are lifted they are moved with
their raising means to be later described. The
central partition I1 is also shown partly broken
respect to the outwardly and upwardly tapered
verse ‘plates cooperate. As can be seen from this
away from the transverse plate l8. Every sur
face of the ice cubes in the chambers 22, 22 which
is in contact with any part of the tray or grid
wall of the center partition I1, and due to this
away adjacent the transverse plate 28 to show 25 tapered wall the ice cubes are forced toward the
side walls I4 of the tray, whereby they are sheared
how the slots of the central partition and trans
?gure, the partition I‘! extends from end to end
of the tray below the slots 21.
Each transverse plate is provided at its lower
assembly is accordingly loosened from the grid
and tray and supported on the ?anges 30, 30 on
the transverse plate l8. Continued rotation of
the lever 43 causes the next cam 38 to engage the
lower end of the center partition I‘! is a ?ange
upper de?ning edge 39 of the opening 40 in the
3! extending into the ice cube chambers 26 at
the opposite sides of the partition IT. The shelves 35 transverse plate l9 to raise the latter with re
end with a ?ange or shelf 30 extending into the
ice cube chambers 22, 23, 24. and 25. while at the
spect to the center partition I‘! and the tray, to
3!) and 3| operate to support and lift the ice cubes
thereby break the bonds of the ice cubes in the
in their respective chambers when the transverse
chambers 23, 23 from the grid and tray. Upon
plates are raised with respect to the tray and
further rotation of the lever 43, the ice cubes in
center partition. In order to shear the ice cubes
from the transverse plates, the center partition A10 the chambers 24 and 25 will be released in suc
cession.
I1 is tapered, that is, its upper portion 32 is wider
This release of the ice cubes in pairs is ac
than its lower portion 33, and operates to force
complished due to the fact that the cams 38
the ice cubes towards the side walls of the tray
come into engagement with their respective
to free the ice cubes from the transverse plates
45 transverse plates in succession from the front to
as the latter lifts the ice cubes.
the rear of the tray, and accordingly very slight
Disposed along the upper portion of the parti
manual effort is required to rotate the lever 43
tion I‘! are spaced aligned projections 35, each
to completely release the ice cubes from the'
provided with a circular bore 38 in which is rotat
grid and tray. Furthermore, it will be observed
ably mounted a shaft 31 of hexagonal cross sec
tion extending throughout the length of the tray. 50 that a very considerable force is applied to the
frozen bonds between the ice and the tray ele
Arranged between the projections or bearings 35
ments because of the mechanical advantage pro
and rigidly secured to the shaft 31 are cams 38
vided by the novel arrangement of levers, cams
which are disposed for engagement with the up
and inclined surfaces of my grid assembly.
per de?ning edges 39 of the openings 48 provided
in the transverse plates, so as to raise the latter 55 After the ice cubes in the chambers 25, 25
have been loosened, the cam 4| engages the cam
with respect to the partition I‘! and the tray l8.
seat 42 which raises the center partition I‘! with‘
Referring to Figure 2 it will be noted that the
respect to the tray. Raising the partition I‘!
upper de?ning edge 39 of the opening 40 in the
causes the flanges 3| to lift and loosen the ice
transverse plate l8 normally rests upon its cam
38, and the upper de?ning edges 39 of the open (:0 cubes in the chambers 26, 26 from the tray l0,
and the ice cubes will cling to the center parti- ings 49 in the remaining transverse plates are
tion I‘! and be supported on the ?anges 3! from
spaced progressively a greater distance from their
which they can be easily removed by the opera
respective cams 38 from the front to the rear of
tor. The operator may then remove the grid
the tray.
Attached to the rear end of the shaft 31 is a cam 65 from the tray, and the ice cubes in the cham
bers 23, 24, 25 and 26 will be supported on their
41 staggered with respect to the cams 38 and is
respective ?anges, whereby the grid when re;
adapted to engage a cam seat 42 formed by
moved from the tray also provides a holder for
punching out a portion of the rear wall 13 of the
the ice cubes which may be removed from the
tray Ill. The shaft 3‘! and cams 38 and 4| are
rotated by a lever 43 secured to the forward end 70 grid as needed.
A modi?ed form of transverse plate I 0| is illus
of the shaft 31. Rotation of the lever 43 through
trated in Figure 3. This plate is identical with
a vertical arc of substantially 180° causes the
the plates l8 to 2! except that the ?ange 30_has
cams 38 to successively engage the upper de?n
been eliminated and one face of the plate is
ing edges 39 of the openings in the transverse
plates to raise the latter singly and in succession 75 tapered forwardly and downwardly; that is, the
2,410,292
rear faces I02 of the transverse plates are sub
stantially vertical but the bottom portions I03 of
the plates are appreciably wider than the top por
tions I'M thereof.
This form of the invention operates similarly
6
stood that this embodiment is to be taken as il
lustrative. only and not in a limiting sense. I do
not wish to be limited to the structure shown but
to include all equivalent variations thereof except
as limited by the scope of the appended claims.
to the form ?rst described except that the in
I claim:
clined faces of the transverse plates not only lift
1. A removable grid for forming ice cubes in an
the ice cubes vertically, but they tend to shear or
ice tray including a partition and a plurality of
twist the cubes with respect to the other walls of
transverse plates movable with respect to said
the ice cube chambers including the tapered por 10 partition, said transverse plates having cam en
tions of the center partition. Therefore, there
gaging surfaces lying in successively higher
are forces tending to move the cubes simulta
planes, a cam associated with each of said cam
neously in three directions when the manual lever
surfaces, and means operable to bring said cams
43 is rotated. These forces are as follows: Ver
into engagement with said cam surfaces for mov
tical or lifting forces applied by the inclined faces 15 ing said transverse plates with respect to said
of the transverse plates; forwardly (of the tray)
directed forces applied by the inclined faces of
the transverse plates; laterally directed forces
applied by the inclined faces of the center parti
tion. These forces insure a complete and easy .20
separation of the ice cubes and the walls of the
ice cube compartments.
If desired, the ice cube supports 3| on the center
partition I‘! may be removed and the transverse
plate 2| provided with ?anges 30’ that extend into 2.5.
the ice-cube chambers 25 and 26, as shown in
partition.
2. A removable grid for forming ice cubes in an
ice tray including a partition and a plurality of
transverse plates movable with respect to said
partition, at least certain of said transverse plates
having means to support ice cubes, said transverse
plates having cam surfaces, a cam for each of said
cam surfaces, and means operable to bring ?rst
one and then another of said cams into engage
ment with said cam surfaces to raise said trans
verse plates and ice supporting means with re
Figure 4, whereby upon raising the transverse
spect to said partition to loosen ice cubes from
said partition.
plate 2|, the ice cubes in the chambers 25 and 26
will be loosened from the tray, center partition
8. An ice tray and an ice 'cube forming grid
and transverse plates.
30 therefor, said grid comprising a longitudinal
Although I have shown the upper de?ning edges
plate and a plurality of transverse plates associ
39 of the openings 46 in the transverse plates
ated therewithv and cooperating with one another
staggered with respect to the cams 38, they can
and said tray to form ice molds, and manually
be arranged in alignment and the cams 38 stag
controlled lever means journaled on said tray and
gered with respect to each other, or the cams 38
operable upon rotation thereof to raise said trans
may be provided with different cam surfaces, to
verse partitions in a predetermined sequence
raise the transverse plates one by one in succes
whereby the operating force on said manual
sion from the front to the rear of the tray.
means is applied solely to the breaking of the
ice bonds between certain of the partitions and
The ice cube release mechanism herein dis
certain of the ice cubes at any given instant.
closed provides a means whereby a moving wall
of each ice cube compartment moves the cube
4. In combination with an ice tray, an ice cube
therewith into a portion of the compartment
forming grid comprising an elongated partition
having a, greater volume and cross-sectional area
and a plurality of shorter spaced apart partitions
than that portion originally occupied by the ice
disposed crosswise of and freely movable in a
cube. As the ice cube is moved into the zone of 45 vertical direction with respect to said elongated
large volume, it is caused to shift within such
partition, and lever means having a control han
zone in a direction at an angle to its original di
rection Of movement and relatively to the moving
wall whereby to free the cube from that moving
wall.
The force moving the cube in one direc- ‘'
tion is applied through a mechanical force trans
mitting mechanism having a large mechanical
advantage. The force moving the cube in the
other direction is applied by moving the cube
along the surface of an inclined plane which
again has a large mechanical advantage. The
individual pairs of cubes and the grid are re
leased from the tray by force applied to a manual
dle movable in a continuous manner in substan
tially the same plane to move ?rst one of said
cross partitions and then another to free the ice
cubes therefrom and to raise all of said partitions
simultaneously with respect to said tray.
5. In liquid congealing apparatus, the combina
tion of a pan member, a metallic grid structure
removably positioned therein for dividing the
pan member into a plurality of cells for contain
ing ice cubes, said grid structure including a
central longitudinal wall member and ‘longitudi
nally spaced elements each independently ver
lever which moves in a plane but the various pairs
tically movable with respect to said longitudinal
of cubes and the grid are released separately and 60 member, means on the grid structure for raising
progressively as the manual lever reaches differ
the grid structure from the pan member and
ent points in its range of movement. These fea
means carried by said grid structure for actuat
ing the movable elements to break the bond be
tween the ice cubes and the grid structure, said
completely the ice cubes and the grid by a single 65 last mentioned means being operable to afford
movement of a lever by the operator and with
movement of said movable elements to effect sep
a minimum instantaneous application of force to
aration of less than the entire number of the
the lever.
entire number of ice cubes from the grid struc
If desired, the grid may be released from the
ture.
tray prior to release of the individual ice cubes by
6. The combination with a tray adapted to con
changing the relative positions of the cams 4| and
tain a substance to be frozen, of a grid structure
38. Also the cam 4! may be placed at the forward
normally positioned in the tray and having a
portion of the ice tray if desired.
longitudinal wall and a plurality of transverse
While I have illustrated and described only one
walls dividing the interior of the tray into a plu_
embodiment of my invention, it is to be under 75 rality of compartments, means carried by said
tures combine to produce an ice cube release
mechanism which may be operated to release
2,410,292
7
8
grid and disposed in a position to exert a force
,9. In a device of the character described, a
tray, a longitudinal wall having a plurality of
sleeves on its upper edge, a plurality of transverse
walls, each having an opening therethrough ad
against the tray to thereby move the grid together
with. frozen substance thereon relative to the
tray,- and means associated with and operable by
said ?rst named means for engaging and moving
,jecent its upper edge, said walls being loosely
each of said transverse walls vertically relative to
the longitudinal wall progressively from one end
to the other end of the grid structure to thereby
release the frozen substance therefrom.
mortised in one another, a shaft having straight
extending transversely to said longitudinal wall
in spaced apart relation along the length there
of and dividing the tray into a plurality of ice
block compartments, said single transverse walls
relative to' the longitudinal wall.
portions and offset portions, said shaft extending
through said sleeves and openings, with said
straight portions in the sleeves and said offset
7. A freezing apparatus for liquids comprising 10 portions in said opening, a lever for actuating
said shaft, said leverv being connected to said
in combination, a tray having a grid structure
shaft at one end thereof and adapted, when being
removably disposed therein, said grid structure
moved, to lift said shaft and walls as a unit and,
including a vertically disposed longitudinal wall
to rotate said shaft to move said transverse walls
and a plurality of vertically disposed single walls
being vertically movably attached to said grid
structure, means on the grid structure for elevat
ing said grid structure together with ice blocks
thereon relative to the tray, and means for mov
ing 'said'transverse walls vertically relative to said
longitudinal wall progressively from one portion
to another portion of said grid structure to break
the bond between the ice blocks and, said grid
walls.
.
-
8. A freezing apparatus for liquids comprising
'
.
'
10. In combination with a freezing tray, a grid
having a longitudinal partition removably sup
ported therein, a series of transverse partitions
vertically movably carried by the longitudinal
20 partition and extending some distance above the
same, and an operating bar carried by the grid
and adapted to extend through openings in said
extensions and adapted to vertically and succes
sively move said transverse partitions.
11. In combination with a freezing tray, a grid
having a longitudinal partition removably sup
ported therein, a series of transverse partitions
vertically movably carried by the longitudinal
partition and extending some distance above the
movably disposed therein, said grid structure in 30 same, aligned openings in said transverse parti
tions above the longitudinal partition, and an
cluding a longitudinal wall and a plurality of
operating bar adapted to be supported by the
walls extending transversely to said longitudinal
longitudinal partition and adapted to extend
wall in spaced apart relation along the length
through the openings in the transverse partitions,
thereof, and dividing the interior of the tray into
said bar being adapted to vertically move the
a plurality of ice block compartments, means for
transverse partitions by a rotary motion thereof.
elevating said grid structure together with ice
12. In combination, an ice tray for a domestic
blocks‘ thereon relative to the tray, means lying
refrigerator, a grid assembly positioned therein
over said longitudinal wall and having a portion
to form a plurality of compartments, said grid as
thereof ‘engageable with each of said transverse
walls adjacent the point of intersection of said 40 sembly comprising a longitudinal grid member
and a plurality of lateral grid members inter?t
Walls for movably securing the transverse walls
ted therewith along the length thereof for move
to the grid structure, and means connecting said
ment in a vertical direction thereto, a rotatable
two means together and being so constructed and
shaft associated with said grid assembly, said
arranged that operation of said ?rst named
shaft having means thereon for moving said lat
means actuates said second named means to
eral gridmembers vertically with respect to said
move said transverse walls vertically relative to
longitudinal grid member.
said longitudinal wall progressively from one end
to the other end of said grid structure to break
WILLIAM H. KITTO.
the bond between the ice blocks and said grid
in combination, a tray having a grid structure re
walls.
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