U.S. patent number 3,698,205 [Application Number 05/187,360] was granted by the patent office on 1972-10-17 for walk-in cooler refrigerated display case combination.
This patent grant is currently assigned to Clark Equipment Company. Invention is credited to Arthur Perez.
United States Patent |
3,698,205 |
Perez |
October 17, 1972 |
WALK-IN COOLER REFRIGERATED DISPLAY CASE COMBINATION
Abstract
This is a combined refrigerated display case and walk-in cooler
or cold room with the display case having a front opening for
unimpeded access to the refrigerated area and a rear opening for
unimpeded access from the walk-in cooler or cold room area. Each of
these access openings has a curtain of refrigerated air thereacross
to prevent the ambient room temperature air and the air from the
cold room entering the refrigerated case space. The case has
shelves therein from which goods may be removed through the front
access opening and on which food may be deposited through the rear
access opening. The case also has a separate horizontal curtain of
refrigerated air across the lower portion of the refrigerated space
to provide two vertically adjacent zones of refrigeration within
the refrigerated space. The refrigerated air forming the curtain in
front of the refrigerated display space is recirculated into the
cold room or walk-in cooler space after passing under the
refrigerated display case.
Inventors: |
Perez; Arthur (Niles, MI) |
Assignee: |
Clark Equipment Company
(N/A)
|
Family
ID: |
22688659 |
Appl.
No.: |
05/187,360 |
Filed: |
October 7, 1971 |
Current U.S.
Class: |
62/256;
62/458 |
Current CPC
Class: |
A47F
3/0452 (20130101) |
Current International
Class: |
A47F
3/04 (20060101); A04f 003/04 () |
Field of
Search: |
;62/255,256 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wye; William J.
Claims
I claim:
1. A refrigerated display case walk-in cooler combination of the
type having an access opening in the front of the display case for
unimpeded access to material therein and having an access opening
between said refrigerated case and said walk-in cooler for
unimpeded access to the material in said refrigerated display case
from said walk-in cooler comprising:
single means for refrigerating said walk-in cooler and at least a
portion of said refrigerated display case,
means for establishing an air curtain directly across the access
opening in the front of said refrigerated display case and serving
to oppose a passage of ambient air through said access opening into
said refrigerated display case,
means for establishing an air curtain directly across the said
access opening between said walk-in cooler and said refrigerated
display case and serving to oppose the passage of air through said
last-mentioned access opening between said walk-in cooler and said
refrigerated display case,
air circulating means for circulating said air past said
refrigerating means across said air curtain means and through said
walk-in cooler,
whereby air is first refrigerated, then utilized to form air
curtains isolating the space in said refrigerated display case,
then circulated through said walk-in cooler before returning to the
refrigerating means for re-cooling.
2. A refrigerated display case walk-in cooler combination as
claimed in claim 1 including:
an upper plenum chamber capable of circulating air from said
walk-in cooler to said air curtains,
a lower plenum chamber capable of circulating air from said air
curtains to said walk-in cooler,
said upper plenum chamber maintained at a pressure greater than
atmospheric pressure, and
said lower plenum chamber maintained at a pressure less than
atmospheric pressure,
whereby air circulated from said walk-in cooler through said upper
plenum chamber, through said air curtains to said lower plenum
chamber and returned from said lower plenum chamber to said walk-in
cooler.
3. A refrigerated display case walk-in cooler combination as
claimed in claim 1 in which:
said refrigerated display case contains shelves accessible through
either of said air curtains.
4. A refrigerated display case walk-in cooler combination as
claimed in claim 1 in which:
said refrigerated display case includes means for establishing an
air curtain within said refrigerated space and directed
substantially horizontal at a plane extending substantially at
right angles to said access opening,
said latter mentioned air curtain serves to divide said
refrigerated space into separate vertically adjacent zones of
refrigerated space.
5. A refrigerated display case walk-in cooler combination as
claimed in claim 2 in which:
one of said plenum chambers contain air cooling means.
6. A refrigerated display case walk-in cooler combination as
claimed in claim 2 in which:
said refrigerated display case includes means for establishing an
air curtain within said refrigerated case and directed
substantially horizontal in a plane extending substantially at
right angles to said access opening,
said latter mentioned air curtain serving to divide said
refrigerated case into separately vertically adjacent zones of
refrigerated space.
7. A refrigerated display case walk-in cooler combination as
claimed in claim 2 in which:
said refrigerated display case contains shelves accessible through
either of said air curtains.
8. A refrigerated display case walk-in cooler combination as
claimed in claim 4 in which:
the lower of the two vertically adjacent zones is maintained at a
temperature lower than that of the upper of the said two vertically
adjacent zones.
9. A refrigerated display case walk-in cooler combination as
claimed in claim 6 in which:
the lower of the two vertically adjacent zones is maintained at a
temperature lower than that of the upper of the said two vertically
adjacent zones.
10. A refrigerated display case walk-in cooler combination as
claimed in claim 7 in which:
the lower of the two vertically adjacent zones is maintained at a
temperature lower than that of the upper of the said two vertically
adjacent zones.
Description
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to combined refrigerated display cases and
cold rooms or walk-in coolers of the type having an opening in
front for unimpeded access to the refrigerated space and an opening
between the display cases and the cold room for unimpeded access
therebetween. The display case in the present invention is very
similar to that shown in co-pending application, Ser. No. 94,711,
Fayez Ibrahim, filed Dec. 3, 1970. The present invention provides
unimpeded access between a refrigerated display case and a cold
room or walk-in cooler. The cold room or walk-in cooler is of the
type which may be used for food preparation or storage, which room
may be maintained at the same or a different temperature than the
food display case.
In the present invention there are two separate and distinct
vertical air curtains. One of these air curtains is across the
front of the refrigerated display case and permits unimpeded access
to the display case for merchandising in an environment such as a
supermarket or other retail establishment. The purpose of this air
curtain is to prevent the ambient air from the supermarket or other
merchandising environment from entering the refrigerated display
case and for preventing the refrigerated air from the display case
from exhausting into the supermarket or other marketing
environment.
The second vertical air curtain is located between the refrigerated
display case and the cold room and is such as to permit unimpeded
access from the cold room to the rear of the refrigerated display
case for stocking the shelves of the case from the food stock being
prepared or stored in the cold room. The purpose of this air
curtain is to prevent the intermingling of the air in the
refrigerated display case and the cold room and thus maintain the
desired temperature in both spaces. Both of these air cutains may
be in parallel paths of the single air refrigeration and
circulation system.
Another independent circulating system provides for a horizontal
curtain of refrigerated air which flows across the bottom of the
refrigerated display area. The refrigerated air in this circulating
system is usually maintained at a lower temperature to provide a
frozen food space in the refrigerated display case.
It is therefore an object of the present invention to provide a
combined walk-in cooler or cold room and refrigerated display case
with an air curtain therebetween to permit unimpeded access to the
refrigerated display space from the walk-in cooler.
It is another object of the present invention to provide a
refrigerated display case with unimpeded access thereto from both
an environment containing ambient air and an environment containing
refrigerated air.
It is a further object of the present invention to provide a
refrigerated display case with unimpeded visual and physical access
from both the front and rear thereof.
Further objects of the present invention will become apparent upon
inspection of the drawings and specifications and will be pointed
out in the claims.
BRIEF DESCRIPTION OF PREFERRED EMBODIMENT
Referring to the drawing, a sectional view of the combined
refrigerated display case and walk-in cooler illustrating the
present invention is shown.
2 is the walk-in cooler space while 4 is the refrigerated display
space. The refrigerated display space 4 is isolated environmentally
from the walk-in cooler or cold room space 2 by the vertical air
curtain 6. The refrigerated display space 4 is isolated
environmentally from the market retail area 10 by the vertical air
curtain 8.
The walk-in cooler space 2 is refrigerated and may be used for food
storage or preparation, for example meat cutting. The refrigerated
display space 4 may contain shelves 12, 14, 16 and 18 for the
display and marketing of refrigerated food stuffs. The food stuff
is placed on the shelves from the storage or preparation space 2
through the air curtain 6. The customer in the space 10 picks up
the food stuff from the shelves 12, 14, 16 or from 18 by reaching
through the air curtain 8. The space 4 is thereby protected from
air contaminates by the air curtain 6 and 8 while permitting
unimpeded access from both the cold room 2 and the marketing area
10.
A horizontal curtain of refrigerated air circulating across the
merchandise on the shelf 18 is independent from the two vertical
air curtains 6 and 8 and the merchandise on this shelf can,
therefore, be maintained at a selected lower temperature than that
maintained for the merchandise stored on the shelves 12, 14 and 16.
Access to the shelf 18 is through the air curtain 6 and 8 in a
manner similar to access to the shelves 12, 14 and 16. It may,
therefore, be seen that a refrigerated display space is provided
having two zones of refrigeration with unimpeded access to both of
these areas for replenishment from the cold room 2 or marketing to
area 10 containing air ambient temperature.
SPECIFIC DESCRIPTION OF THE PREFERRED EMBODIMENT
The cold room or walk-in cooler 2 has a rear wall 18 with an access
door 19 therein for the entry of personnel and the transfer of food
stuffs into the storage area. 2 has a floor 20 and an insulated
cover 22. The floor 20 extends under the refrigerator display case
and into the marketing area 10. The insulated roof 22 extends over
and connects with the insulated upper structure 24 of the
refrigerator display case. The front of the case 26 is also
insulated.
The cold room or walk-in cooler 2 and the refrigerated display case
have a common overhead plenum chamber 28 containing refrigeration
coils 30. This plenum chamber has a fan or other air circulating
device 32 for bringing the air from the walk-in cooler into the
plenum chamber and exhaust ducts 34 and 36 for ejecting the air to
form air curtains 6 and 8 respectively. The lower portion of the
refrigerated display case has a plenum chamber 38 with an exhaust
fan or other air ejecting device 40 located in the wall 42 thereof.
This plenum chamber has inlet air ducts 44 and 46 through which air
from air curtains 6 and 8, respectively, flows into the chamber 38.
The walk-in cooler 2, the air circulation device 32, the
refrigeration coils 30, plenum chamber 28, air curtains 6 and 8,
plenum chamber 38 and air exhaust device 40 form an air cooling and
circulating system for the walk-in cooler, the air curtains and the
upper portion of the refrigerated display case containing shelves
12, 14 and 16.
The base of the refrigerated display case has a self-contained
refrigerated air system containing inlet ports 47, a plenum chamber
48, an air circulating fan 50, a second plenum chamber 52, an
evaporator coil 54, a third plenum chamber 56, and directional
ports 58. This self-contained refrigerated air system is
independent of the circulating system described above and is
normally used to maintain the food stuffs stored on the shelf 18 at
a temperature below 32.degree. F.
It may thus be seen that a self-contained unit is provided with a
shelf 18 for storage, display and marketing of food stuffs,
particularly meat.
OPERATION OF THE PREFERRED EMBODIMENT
Referring to the drawing as described above, the structure
illustrated has two separate and distinct refrigerated cooling
systems.
The first of these refrigerated air systems provide a means for
cooling the cold room and for maintaining curtains of refrigerated
air across both access openings to the case. The desired storage
temperature and, therefore, the desired temperature of this air in
the preferred embodiment of the invention is between 35.degree. and
50.degree. F. The air in this system is exhausted from the cold
room 2 by the air fan 32 into the small plenum chamber 60,
maintaining the air in this chamber at a pressure considerably
above that air in the walk-in cooler 2. The air flows from the
chamber 60, past the cooling coils 30, where it is cooled and then
exhausted into plenum chamber 28 at a pressure above the
atmospheric pressure of areas 2, 4 and 10. The refrigerated air
flows from the plenum chamber 28 through the directional louvers 34
and 36 downward to form air curtains 6 and 8, respectively. The air
in plenum chamber 38 is maintained at below the atmospheric
pressure in areas 2, 4 and 10 by exhaust fan 40 located in the wall
42. The air in curtain 6 is sucked into the plenum chamber 38
through the louvers 44 and the air from curtain 8 is likewise
introduced into chamber 38 through louvers 46. The fan 40
thereafter ejects the air from the chamber 38 into the cold room of
walk-in cooler 2 to start the circulation pattern over again. The
two air cutains 6 and 8 thermally isolate the material on shelves
12, 14 and 16 while permitting physical access to this material
from either the front or rear of the refrigerated display case. The
capacities of the fan 32 and 40 are so balanced as to each move the
same volume of air per unit time. The restriction of the louvers
34, 36, 44 and 46 are so balanced that together with the fan 32 and
40 they permit the same amount of air to enter 44 as exhausted from
34 and the same amount of air to enter 46 as exhaust from 36, thus
maintaining the system in balance.
A secondary air cooling and circulating system may be used if it is
desired to store food stuffs in the refrigerated display case at
two different temperatures. The air temperature in the lower part
of the refrigerated display case, including the area above the
shelf 18, would in the absence of supplemental cooling means, be
substantially the same as the temperature of the air surrounding
the shelves 12, 14 and 16.
A separate and distinct refrigerated air curtain system is provided
in the base of the case to prevent this area becoming a dead air
space and also to permit the temperature of this area of the case
to be maintained at a lower temperature than that maintained in the
upper part of the case. For example, it may be desired to store
frozen food on the shelf 18 and retain it in the frozen condition
until removed by the customer through the access opening 8. The air
in this system may also be maintained at the same temperature as
that in the upper system with a minimum of interference between the
air circulation of the two systems.
In the lower system, air is exhausted from the area surrounding the
shelf 18 through the opening 47 in the front lip of the base 26.
This air proceeds to the plenum chamber 48. The fan 50 transfers
the air from the chamber 48 to the chamber 52, thus maintaining the
pressure in the chamber 52 above that appearing in the chamber 48.
The air from chamber 52 is then forced through the evaporator 54 to
the chamber 56 extending longitudinally along the case to the rear
of the evaporator 54. The cold air in this chamber 56 then proceeds
upwardly and out into the storage space along the bottom of the
case through the directional louvers 58 to form a horizontal air
curtain 59 across the top of the space including the shelf 18. This
air curtain 59 is exhausted from the space through orifices 47 and
the air circulation cycle repeats itself. Since the weight of air
per unit volume varies inversely with temperature, cold air tends
to settle to the bottom of an air mass. For this reason, the
horizontal air curtain circulating across the top of the shelf 18
being maintained at below 32.degree. F. maintains the material
stored in this shelf in a frozen condition, while the material
stored on shelves 12, 14 and 16 are maintained at a temperature
above freezing. This permits the case which is the subject of the
present application to be used as a combined frozen food and
refrigerated food display case.
It may thus be seen that the present invention provides a
refrigerated case having unimpeded access from the front thereof
for the display and merchandising of food stuff and unimpeded
access from the rear thereof for the replenishing of food stuffs
from the refrigerated food processing or storage area.
The present invention provides a means for the efficient display,
marketing and replenishing of food stuffs in a refrigerated display
case while maintaining a desired atmospheric environment in the
display space.
Having thus described the preferred embodiment of the present
invention, it will of course be understood that various changes may
be made in the form details, arrangement and proportion to the
parts without departing from the scope of the invention which
consists of the matter shown and described therein and set forth in
the appended claims.
* * * * *