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Патент USA US2108104

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Feb. 15, 1938.
Filed June 29, 1956
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Patented Feb. 15, 1938
Almon J. Cordrey, Chicago, Ill., assignor to Liquid
Carbonia Corporation, Chicago, Ill., a corpora
tion of Delaware
Application June‘29, 1936, Serial No. 87,882
3 Claims.
This invention relates to a delivery vehicle hav~
ing a plurality of separate closed cold storage
compartments therein each with a separate cool
ing medium.
( Cl. 62-13)
Another object of this invention is to provide
a delivery vehicle with separately insulated cold
storage compartments having an individual cool
ing agent or means therein.
More speciñcally this invention relates to a milk
delivery vehicle, such as a truck or wagon used
A further object of this invention is to provide
a milk truck with separate compartments housing
for delivering milk and other perishable dairy
products to consumers, and having a plurality of
tiers of cases of milk with each of the compart
ments having an individual door and an individ
individual cold- storage compartments therein
ual cooling agent therein.
l0 adapted to be opened successively along the de- '
A further object of this invention is to provide
livery route as the contents of the preceding com
a method of refrigerating dairy products along
partment are exhausted. The invention also in
a delivery route with minimum amounts of cool
cludes a method of refrigerating heat perishable ing agent.
goods, such as dairy products, along a delivery
Milk wagons or trucks are usually built with a
compartment in the rear thereof equipped with
racks or shelves for receiving cases of milk.
These cases are covered with chopped water ice
20 to cool the milk bottles and the contents of the
compartment. However as this compartment in
the wagon or truck must be continually opened
along the delivery route for removal of milk
bottles therefrom and for insertion of warm
25 empty bottles therein, the ice is rapidly melted.
Therefore large quantities of ice must be carried
or else the dairy products remaining in the Ve
hicle near the end of the delivery route Will be
come warmed up by outside weather conditions.
This invention provides a delivery vehicle for
heat perishable products, such as milk, cream,
butter and eggs, having separate storage compart
ments therein for said material so that the open
ing of one compartment for removal of products
35 therefrom and for insertion of warm empty bottles
therein will not affect the temperature of the
other compartments. In this manner, it is possi
ble to effect large savings in the amount of cooling
agent used and to properly proportion the amount
40 of cooling agent in each compartment so that
the compartment will be cooled for just the period
along the delivery route in which it houses the
perishable goods.
Whileit is desired to use “dry ice” or solidified
45 carbon dioxide as the cooling agent in each com
partment, it should be understood that the struc
ture of this invention also permits the use of
other cooling agents, such as water ice, brine ice,
cold cans containing eutectic liquids and the
like. The invention will be hereinafter described
with “dry ice” as the cooling agent in the com
Other and further objects of this invention will
become apparent from the following detailed de 15
scription of the annexed sheet of drawings which
forms a part of this speciñcation and discloses a
preferred embodiment of the invention.
On the drawing:
Figure l is a side elevational view of a milk
truck equipped with cold storage compartments
according to this invention.
Figure 2 is a vertical cross sectional view taken
substantially along the line II-II of Figure l.
Figure 3 is a fragmentary horizontal cross sec
tional view taken substantially along the line
III-_III of Figure 2.
As shown on the drawing:
According to this invention a delivery wagon
or truck such as a milk truck I0 having a storage
space deñned by a roof II, side walls I2, a rear
wall I3 and a floor I4 is lined with insulating ma
terial I5 such as, for example, cork, balsam wool
or the like along the roof, side walls and rear Wall.
The floor I4 can also be lined with insulating ma 35
terial (not shown) if desired.
According to this invention the storage space
is divided into a plurality of compartments I6,
I'l and I8 separated from each other by insulated
walls I9 and 2D. Each compartment I6, I 'l and
IB can be lined with metal 4sheets 2| or with
wooden boards so that the compartment will
have rigid peripheral Walls.
Each compartment I6, I'l and I8 has a plurality
of pairs of brackets 22, 23, 24 and 25 therein with
the brackets of each pair in horizontal alignment.
The pairs of brackets are spaced vertically in the
compartments and provide shelves or slides for
cases of milk 2B. The top pair of brackets 25 in
each compartment supports a tray 21 thereon for 50
Y a purpose to be hereinafter described. As shown
in Figure 3, the brackets supporting the cases of >
It is then an object of this invention to provide
a delivery vehicle with a plurality of separate
milk extend the full length of the compartment.
cold storage compartments therein.
The brackets 25 supporting the trays 21, however,
shelves can be used to carry the cases of milk
bottom of the compartments. As the milk cases
are ordinarily open at the bottom, it can be ap
preciated that this circulation of air will be un
impeded in each compartment. At the same
time, the cold air circulates over the butter, eggs
and the like disposed in the sections 30, 32 and 34
and the trays 21. It is desirable, however, that
of the trays 21.
the supporting means for these cases and trays
do notextend across the full width of the com
When the ñrst compartment I6 is exhausted of
its products, the milk cases are then iilled with
warm empty bottles. The next compartment I1 10
can then be opened for delivery of its contents
may be shorter than the brackets 22, 23 and 24,
since the trays 21 are preferably disposed in the
center of each compartment or toward the front
end thereof, as shown.
Obviously, other forms of supporting slides or
10 partment and block off the flow of air around
the entire compartment. If shelves are used that
extend across the full width of the compartment,
the same should be perforated to allow passage
of air therethrough.
Each tray 21 has two sections, such as 30 and
along the intermediate part of the delivery route.
When the contents of the compartment I1 are
exhausted, then the compartment I8 is used to
supply the consumers on the last part of the 15
3|, 32 and 33, and 34 and 35, therein (Figure 3).
delivery route.
The forward sections 30, 32 and 34 of the tray
21 can be used for storing butter, cheese, eggs
and the like perishable foodstuffs, whichrare not
Retail milk routes lare usually covered in from
7% to 10 hours, so that by making three equal
20 conveniently stored in the cases 26.
The rear
sections 3|, 33 and 35 of the trays 21 contain the
“dry ice” or other cooling agent for the cold stor
age comparts I6, I1 and I8. The sections 3|, 33
sized compartments, the ñrst compartment will
be exhausted of its contents in approximately two 20
and one-half to three and one-third hours from
the time the milk truck has left the dairy. The
second compartment will then be exhausted in
and 35 are preferably disposed in about the center about ñve to six and two-thirds hours, and the
25 portions of the compartments. Where "dry-ice” `third compartment in about seven and one-half 25
is used as the cooling agent, the sections 3|, 33 to-ten hours after the delivery trip begins.
` By dividingthe truck into three insulated com
and 35 may be of the same size as shown in Fig~
ure 3, to house a slab of "dry ice” 36 therein. The partments, each having its individual door, it is
slabs 36 are of the same length and width, but possible to place a tray for “dry ice” on a slide
30 vary in thicknesses and Weight to handle the at the top of each compartment, and in'each of 30
refrigeration , required.
these trays place just suflicient “dry ice” for the
Since the rate of heat ñow per hour into each
compartment is approximately the same, the
Same heat conduction surface is required.
Each cold storage compartment I6, I1 and I8
is closed by a separate door 31, 38 and 39, re
time required in the normal emptying of the com~
partment. For example, on the basis of the
representative times mentioned above, ñve
pounds of “dry ice” could be used in the first com
partment, ten pounds in the second, and fifteen
pounds in the third.
It should be understood that this invention
provides an arrangement of individual, separated
spectively. These doors extend the full height
of the compartment, and the opening of one
door will in no way disturb the temperaturecon
40 ditions in the other compartments.
According to this invention, the first compart
ment I6 is intended to house milk and other dairy
products that are to be delivered during theñrst
part of the delivery route. Since the contents of
45 this first compartment willbe exhausted within
a shorter time than the contents 'of the other
compartments, the amount of “dry ice” neces
sary to keep the contents of the first compart
ment refrigerated for the relatively short time
50 they remain in the compartment is less than the
amount necessary for the'other compartments.
Therefore, the section 3| of the tray 21 in the
first compartment will contain a relatively thin
1- slab 36 of "dry ice”, while the sections 33 and 35
55 will contain slabs of increasing thickness. If de
sired, the sections 3I, 33 and 35 may be closed by
covers (not shown) and insulated except at the
bottoms thereof. In this modification, the metal
bottoms of the sections will be cooled by "dry
ice”, and in turn will cool the air in the com
The milkman can conveniently slide the cases
of milk toward the front doors of each compart
cold. storage compartments for perishable food
stuifs and the like. Thesev compartments are
closed with separate doors, and the opening of
kthe door to one compartment Will not affect the
temperatures in the other compartments. Thus,
in delivering milk along a route, the contents of
one compartment can be exhausted before the
other compartments are opened, and the amount
of cooling agent for these compartments can be
considerably reduced.
Furthermore, the insertion of warm empty bot 50
tles into a compartment from which milk is being
delivered at the time will not melt the cooling
agent in the other compartments. Heretofore,
the insertion of warm bottles into the cooling
space of a milk truck raised the temperature of .
the entire cooling space, thus requiring large
amounts of cooling agent in the space to offset
the temperature rise effected by the insertion
of warm bottles in thespace.
I am aware that many changes may be made
vand numerous details of construction may be
varied through a wide range without departing
from the principles of this invention, and I,
ment as the contents of the cases are being de
therefore, do not purpose limiting the patent
65 livered. The cases of milk 26 are arranged in
granted hereon otherwise than necessitated by
vertical tiers with two or more cases on each level
the prior art.
of tiers. As the contents of the front cases are
I claim as my invention:
exhausted, these cases can be filled with empties >
1. In a milk truck, a plurality of insulated
and rearranged so that the full cases will be dis
cold storage compartments, brackets in said com
' Vpartments for supporting cases of milk in spaced
70 posed in the front of the compartment.
The "dry ice” in the trays 21 on top of each
cold storage compartment cools the metal sur
faces of the “dry ice’.’ sections 3l, 33 and 35, and
the air coming in contact with these cold metal'
75 surfaces is cooled and drops by convection to the
vertical relation in each compartment, additional
brackets near the top of each compartment, trays
' slidable on said additional brackets having front
and rear sections therein and dry ice disposed in
said rear sections.
2. A milk truck comprising a body portion hav
ing top, bottom, side and back Walls, door open
ings in the side walls near the fronts thereof giv
ing entrance to the body portion, insulation
around the top. side, bottom and back walls of
the body portion to define a storage compart
ment therein rearwardly of the door openings,
insulated walls dividing the storage space into a
plurality of open fronted compartments extend
10 ing from the top to the bottom wall of the vehi
cle, individual doors for closing the open fronts
of the compartments, pairs 'of superimposed
tracks secured along the side walls of each com
partment to provide supports for cases of milk,
15 additional pairs of tracks secured onthe side
walls of the compartments near the tops of the
compartments, trays slidable on said additionalV
tracks having front and rear sections therein,
said front sections of said trays adapted to re
20 ceive packaged heat perishable goods and> said
?rear sections adapted to receive dry ice for cool
ing the compartments.
3. A milk truck comprising a body portion
having top, bottom, side and back walls, door
openings in the side walls near the fronts there
of vgiving entrance to the body portion, insulation
around the top, side, bottom and back walls of
the body portion to deñne a storage compartment
therein rearwardly of the door openings, verti
cal walls dividing’ the storage compartment into
a plurality of open fronted compartments, indi
vidual doors for closing the open fronts of the
compartments, pairs of superimposed brackets
secured along the side Walls of each compartment
to provide supports for cases of milk, additional
pairs of brackets secured on the side walls o'f
the compartments near the tops ofthe compart
ments, and trays slidable on said additional
brackets, said trays being shorter than the length
of the compartments to provide spaces at the
front and rear of the compartments for circu
lation of air around the trays.
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