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Патент USA US2136222

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Nov. ‘8, 1938. .
' 2,13\6§2Z__2
Filed Feb. 20, 1935
Fay/7200a’ /7.’ Sfarr
0/’ 0
Patented Nov. 8, 1938
2,136,222 '
Raymond H. Starr, Kansas City, Mo.‘
Application February 20, 1935, Serial No. 2,363
‘5 Claims. (Cl. 62—103)
This invention relates to refrigerators and
particularly to those of that character wherein
merchandise upwardly for circulation around the
refrigerating elements.
condensation from therefrigerating elements is
It is well known that moisturecontent of the
merchandise on display is absorbed. by the air
and‘ deposited on the refrigerating elements in
‘the form of “frost which .is added to by accumu
lations caused by moisture laden air being car?
ried into the refrigerating .compartments upon
caught by drip pans that are supported over the
merchandise undergoing refrigeration. In- re
frigerators of this character, the drip pans not
only interfere with circulation of air around the
refrigerating elements, but they form‘ surfaces
on which moisture in the air condenses and
10 drips therefrom onto the merchandise.
opening of the doors H.
It is, therefore, the principal object of the pres
elements and it is necessary to defrost the coils
at frequent periods. When defrosting the refrig
erating elements, the ice melts and drips there
from in the direction of _the merchandise but» is 15
caught in a drip pan that is supported below the
In accomplishing this and other objects of the
invention, as hereinafter pointed out, I have pro
refrigerating elements.
videdimproved details of ‘structure, the preferred
This construction takes care of the moisture’
from the refrigerating elementsbut due to the
size and relatively low- conductivity of the pans,
they tend to retain low temperatures and are'slow 20
to conform to air temperatures within the case.
Consequently, air contacting the under surface
of the pans reaches the dew point and, therefore,
form of which is illustrated in the accompanying
20 drawing, wherein:-
Fig. 1 is a cross ‘sectional view through adis
‘ play type refrigerator equipped with refrigerating
elements and drip pans embodying the features
of the present invention.
25. .
Fig. 2 is an enlarged cross section through one
condenses thereon and drips onto the merchan
of the refrigerating elements and the drip pan
associated therewith.
Fig. 3 is a detail perspective view of one end
erating elements whereby the areas from which
tion of the refrigerating surfaces. The sizev of
the drip pans can thus be reduced to that suffi 30
cient to catch the water, thereby not only pro
moting circulation of air about the refrigerating
elements but reducing the thermal capacity of
the pan so that the temperature of the pan is '
quicker to respond to the temperature of the air. 35
' _
‘Fig. 5 is an enlarged perspective view of a por
tion of one of the drip pans particularly illus
trating. its construction whereby condensation in
Consequently, the air does not as quickly reach
the dew point when moving in contact with the
the bottom of the. pan is prevented.
Referring more in detail to the drawing:
l designates a conventional refrigerator‘ dis~
play caseincluding front and rear walls 2 and 3
connected by top and bottom walls 4 and 5 and
end walls 6 to form a longitudinal refrigerating
’ compartment ‘I. Supported in the refrigerating
’ compartment is
plurality of ' superimposed
shelves 8 and 8’ upon which merchandise is placed
for display through transparent‘ panels 9 that are
incorporated into the front wall 3. Access is had
r ~ to the display on the shelves through openings l0
provided in the rear wall 2 and closed by doors I I.
In display refrigerators of this character, refrig
erating elements I! are usually located in the
top of the compartment 1 and over the mer
'55 chandise on display in order to provide natural
gravitational movement of the cold air down
wardly. from the relatively cold temperaturelsur
' rounding the refrigerating elements'and over the
relatively warmer merchandise on the shelves and
to movement of relatively warm air surrounding the
the melting ice drips are limited to a small por
Fig. 4 is a fragmentary vertical section through ‘
one of the refrigerating elements and drip pans
I, therefore, provide ‘an arrangement of refrig
of the refrigerating velements particularly illus
trating their relation to the drip pans which
30 collect water resulting from defrosting of the
refrigerating elements.’
it interferes with e?'iciency'of the refrigerating
ent invention to provide a refrigerating element
and drip pan construction which promotes circu
lation of air and prevents condensation on the
15 under surface of the pan.
'This frost accumulates to such an extent that 10
Opposite facesof the pan have different capaci
ties for absorbing radiant energy; that face which
faces the refrigerating element is bright, while
the other face is darkened. Thus the tempera
ture of ‘the pan itself will be warmer than if both
faces have equal capacities for absorbing radiant
In thefillustrated instance, ‘the refrigerating .
elements l2 are arranged in pairs designated I3
and I4 and extend longitudinally of the com
partment, each element comprising intercon
nected pipes l5 arranged in the form of a hollow 50
square with its diagonal axes in perpendicular
and horizontal planes so that the radiating ?ns
l6 thereon are ‘positioned with‘ the lower corners
II thereof located in the perpendicular plane. 55
By thus locating the ?ns, moisture melting from
the pipes gravitates downwardly over the faces
of the fins and along the lower converging edges
l8 and I9 thereof to the corners II, from where
it drips into the drip pans above mentioned.
With this arrangement of the coils, it is clearly
moving thereover from reaching the dew point.
obvious that a drip pan need be provided of only
sufficient width to catch the water dripping from
The maintenance of this temperature also has
the advantage in that it prevents formation of
the corners II.
ice in the pans that would cause them to over
In order to insure that the water does not
drip from the edges l8 and i9, the ?ns are pref
so that the capillary action afforded by the spaces.
therebetween is su?icient to retain the ?owing
water in contact therewith until it reaches the
?ow when the refrigerating elements are de
It is also possible to maintain the pans in
relatively dry condition because the water does
not freeze therein, but readily drains therefrom
into the collecting pan and from there into the 10
points H.
disposal pipe 24.
erably spaced close enough upon the pipes [5
The drip pans 20 and 2| for the respective
refrigerating sections are formed in the shape
of troughs sloping from one end of the compart
ment to the other where they empty into a col
lection pan 22 having an opening 23 in one
corner thereof connected with a waste pipe 24
leading to a sewer or other place of disposal.
For convenience of construction, the troughs
20 and 2| are preferably formed of strips of sheet
metal bent on their longitudinal centers to pro
vide valleys 25 and upwardly diverging sides 26
and 2‘! spaced apart a sufficient distance to as
sure collection of the water dripping from the
?ns H.
In order to stiffen the troughs and enhance the
appearance of the upper edges thereof, they are
preferably ?anged inwardly and then down
wardly to lie against the inner faces of the
30 troughs as indicated at 2B. The pan 22 is also
constructed of sheet metal and has ?aring sides
29 conforming to the side ?anges of the troughs
as best illustrated in Fig. 3.
In order to further reduce the thermal ca
35 pacity of the troughs and pan 22, they are pref
erably constructed of a metal having high ther
mal conductivity such as for example aluminium
or an aluminium alloy of extremely light gauge.
By thus constructing the pans, the high ther
40 mal conductivity thereof causes the temperature
of the pans to more quickly assume the tem
perature of the air circulating thereunder and
substantially relieves the fins of condensation
on the under surfaces thereof.
air circulating thereabout becomes warmer and
results in increased circulation about the cooling 20
elements. As the merchandise cools off, the heat
radiation therefrom decreases and the pans cool
off in the same proportion to correspondingly re
duce air circulation about the cooling coils.
From the foregoing it is apparent that I have 25
provided a coil arrangement and pan construc
tion which prevents condensation on the under
side of the pan that ordinarily drips upon the
merchandise on display.
By maintaining the pan at a temperature sub 30
stantially that of the air moving thereacross, the
pan is maintained in relatively dry and sanitary
It is also obvious that since the pan is only of
su?icient width to catch the moisture dripping 35
from the coils, it does not interfere with circula
tion about the refrigerating elements, but due to
the high temperature thereof, the circulation
about the cooling elements is increased.
What I claim and desire to secure by Letters 40
Patent is:
1. In a refrigerator, a cooling element having a
row of drip portions for ice melted from said ele
I have found, , ment, and a drip pan supported under said drip
portions and having a polished inner surface
however, that by treating the under surfaces
of the pans with a dark coating having heat ab
sorbing properties as indicated at 30, the metal
quickly absorbs and retains heat radiated from
the merchandise on display so that the tempera
ture of the pan tends to approach that of the
,The drip pans also provide means for con
trolling air circulation about the cooling ele
ments. For example, when warm merchandise is
placed on the shelves, heat radiating therefrom 15
is absorbed by the coating 30 to raise the tem
perature of the pans to approximately that of
the merchandise. Upon heating of the pans, the
I have also found that byv providing the pan
with a bright or polished upper surface, as in
dicated at 3|, the radiant energy absorbing ca
pacity thereof is greatly reduced and radiation
of the heat absorbed through the lower heat
absorbing face is inhibited in the direction of
the cooling coil, the temperature of the coil,
therefore, has less effect on the pan, and I am
enabled to additionally raise the temperature
The troughs are preferably supported under
the respective cooling elements by means of
hooks 32 engaging the lowermost pipe l5 and
65 having their lower ends connected to cross bars
33 extending transversely of the troughs in
spaced relation to the bottom thereof.
For example, assuming that the temperature
facing said cooling element.
2. In a refrigerator, a cooling element having a
row of drip portions for ice melted from said cool
ing element, and a drip pan supported under said
drip portions and having a polished inner sur
face facing said cooling element and having a
dark, heat absorbing outer surface.
3. In a refrigerator, a cooling element having a
row of drip portions for ice melted from said cool
ing element, and a drip pan supported under said L1 in
drip portions and having a polished surface fac
ing said cooling element and a heat absorbing
surface on the side opposite said cooling element.
4. In a refrigerator, a cooling element in the
refrigerator, and a drip pan supported under (30
said element‘and having polished surfaces fac
ing said coolingelement and heat absorbing sur
faces on the other sides thereof.
5. In a refrigerator having a merchandise
storage space, a cooling element for effecting
circulation of air in said storage space, and
a shield member interposed between said storage
space and the cooling element and having a heat
temperature of 40° the temperature of the drip
absorbing surface facing said storage space for
absorbing heat radiating from merchandise con
tained in said space and having apolished sur
face facing the cooling element for retaining the
pan can be maintained at a constant tempera
heat absorbed by the heat absorbing surface.
surrounding the coils which may be termed a
cold body is 30“ and the merchandise which
may be termed a warm body is maintained at a
ture of 38° which is more nearly that of the
75 merchandise and is high enough to prevent air
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