U.S. patent number 3,769,805 [Application Number 05/246,789] was granted by the patent office on 1973-11-06 for revolving display capsule.
This patent grant is currently assigned to Melbro Corporation. Invention is credited to Louis J. Corini.
United States Patent |
3,769,805 |
Corini |
November 6, 1973 |
REVOLVING DISPLAY CAPSULE
Abstract
A stationary display container has a plurality of shelves
mounted on a central rotor therein and doors to gain access to the
shelves. The container is temperature controlled by thermoelectric
means including water cooling and fan circulated air.
Inventors: |
Corini; Louis J. (Philadelphia,
PA) |
Assignee: |
Melbro Corporation
(Philadelphia, PA)
|
Family
ID: |
22932211 |
Appl.
No.: |
05/246,789 |
Filed: |
April 24, 1972 |
Current U.S.
Class: |
62/3.6; 62/255;
62/250; 62/381 |
Current CPC
Class: |
F25B
21/02 (20130101); A47F 3/0404 (20130101); F25D
25/027 (20130101); F25D 17/06 (20130101); F25D
2317/0661 (20130101); F25D 11/00 (20130101) |
Current International
Class: |
A47F
3/04 (20060101); F25B 21/02 (20060101); F25D
25/02 (20060101); F25D 11/00 (20060101); F25b
021/02 () |
Field of
Search: |
;62/250,381,3,255 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wye; William J.
Claims
What is claimed is:
1. A controlled temperature container having a rotatable inner
shelf means, comprising:
a. a base;
b. a capsule mounted on said base and having an access port therein
and a door mounted thereon covering said access port;
c. a rotor means comprising a rotor having a central cylindrical
portion extending upwardly from a horizontally extending base
portion and having a plurality of shelves mounted on said central
portion, disposed within said capsule for rotation with respect
thereto; said central portion being hollow and having a plurality
of holes therein; said base portion having a plurality of louvers
therein; and
d. controlled temperature means comprising at least one
thermoelectric module; and air circulation means comprising a fan
mounted below said base portion to circulate air through said
central portion and said louvers.
2. The invention of claim 1 wherein said rotor means has a motor
mounted to a frame and a spider member attached to said motor for
rotation in response to rotation of the shaft of said motor; said
spider member being connected to said base portion of said rotor so
that said base portion rotates with said spider member.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
Reference is made to my prior copending applications for a Portable
Reverse Temperature Controlled Container, Ser. No. 216,149, filed
Jan. 7, 1972 and a Temperature Controlled Mobile Cart, Ser. No.
218,356, filed Jan. 17, 1972, the disclosures of which are
incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a food display capsule of the type used,
for example, in cafeterias and the like, and in particular, to a
controlled temperature capsule having revolving shelves
therein.
In the prior art it is known to use thermoelectric means to control
temperatures in a small unit, such as the unit disclosed in my U.S.
Pat. No. 3,445,039, issued May 20, 1969 for a Liquid Dispenser with
Timer Control.
SUMMARY OF THE INVENTION
The present invention comprises a thermoelectric controlled
temperature food display case with rotary means for rotating a
plurality of shelves, whereby food can be presented to a access
port for removal; said port being normally sealed by a door.
In various embodiments the rotary means is such as to rotate a
plurality of shelves at a uniform speed of say 1 or 2 rpm and the
device is so constructed that when the access door is opened the
rotary means automatically prevents further rotation, so that food
may be removed. Upon closing the door the rotary means starts
rotating the shelves again. A plurality of access doors can be
utilized.
In the alternative, the rotary means can be manually actuated by
means of a switch.
The heat transfer means comprises thermoelectric modules mounted on
a plate and having a water cooled coil and blocks attached thereto
for transferring and disposing of heat during the cooling
cycle.
The thermoelectric means can be wired for reverse polarity so that
by simply throwing a switch the means can either heat or cool; such
means being shown in my prior applications referenced above.
One of the principal advantages of this device is that it presents
a large quantity of diverse foods to a potential customer in line
in a cafeteria and allows the food to be removed quickly without
dispensing a great deal of heat and without interfering with other
food arranged on the shelves. Further the unit can be used for hot
foods at one part of the day and cold foods during another thus
cutting down on overhead and substantially contributing to the full
use of the device.
Accordingly, it is an object of this invention to provide a rotary
unit of the type described for use particularly in a cafeteria,
which has both rotation means and thermoelectric temperature
control means.
This and other objects of my invention will become apparent from
the following description with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a capsule in accordance with the
preferred embodiment of my invention, shown with one access door
open;
FIG. 2 is a vertical central section taken as indicated by the
lines and arrows 2--2 in FIG. 1;
FIG. 3 is a horizontal section taken as indicated by the lines and
arrows in 3--3 in FIG. 2;
FIG. 4 is a perspective view showing thermoelectric modules and
cooling coils disclosed in the proceeding two figures;
FIG. 5 shows a modification of a portion of the device as shown in
FIG. 2 with portions removed for the sake of simplicity and the
outline of a capsule base shown in phantom lines; and
FIG. 6 shows a section of the outer portion of the capsule taken
similar to FIG. 2, showing a further modification with portions
shown in phantom lines or broken away and portions removed for the
sake of simplicity.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Although specific forms of the invention have been selected for
illustration in the drawings, and the following description is
drawn in specific terms for the purpose of describing these forms
of the invention, this description is not intended to limit the
scope of the invention which is defined in the appended claims.
FIG. 1 shows a complete capsule designated generally 10 with an
access door 12 in the open position. The capsule has a rotor means
designated generally 14. This particular embodiment shows a
cylindrical capsule made of a glass or plastic material (which
shall be discussed further hereinafter) and having a plurality of
access doors. The circular shelves 16, 18 and 20 are typical food
carrying shelves similar to those found in a counter top pie
dispenser in a luncheonette, and they are arranged in similar
spacing to that known in the industry so as to afford room for
placing a number of dishes of dessert, salad or the like for easy
removal by hand. However, the unit has a great advantage over prior
art units in that the access port or opening (over which the door
is mounted in the close position) is of a sufficient size only for
inserting a hand and removing the food. Thus when the door is
opened, only a small portion of the heat or cold is lost from the
inner chamber formed by the capsule. In prior art units the access
area was large in comparison to the container, and accordingly, a
great deal of heat or cold was lost when opening the container for
access of the food, thereby making it practically impossible to
maintain controlled temperature.
The shelves are mounted on the rotor means in any suitable way such
as by flanges and screws 22, 24 FIG. 2. The shelves, of course,
could be mounted on a tapered center post with various diameter
holes therein and upwardly extending flanges for a mating
relationship with the tapered surface of the rotor means.
The rotor means 14 also serves as an air ventura, and in this
regard, the upper portion has a plurality of slots 26 FIG. 2
through which air is circulated as shown by the arrows. The air
travels down the central column 28, through the enlarged base
portion 30, under the outwardly extending base portion 32, up
through the louvers 34 and thence through the capsule chamber 36
and back into the slots 26. The air is moved by the fan 38.
The rotor 28, 30, 32 is driven by a gear reduction motor 40 at a
speed of approximately 1 or 2 rpm (revolutions per minute). The
motor 40 is mounted on the open web 42 of a cylindrical bracket 44
which is fixedly mounted to a plate 46. The shaft 48 of the motor
extends upwardly and is engaged with the web 50 of a drive spider
52. The spider comprises four equally spaced strap flanges 54, each
of which has a ball bearing 56 mounted to its outer terminal end.
The bearings 56 ride on the plate 46, and are spaced slightly from
the outwardly extending base portion 32 of the rotor. The spider
strap flanges have holes therein (as shown) for reception of
shoulder pins 58; such that the shoulders of the pins rest upon the
horizontally extending portions of the spider strap flanges. The
pins 58 are fixedly connected to the rotor base portion 32 and
serve as both spacers and the means by which the spider 52 turns
the rotor (28,30,32) in response of movement of the shaft 48 of the
gear reduction motor 40.
In order to channel and distribute the hot or cold air, the
cylindrical member 44 has mounted therein the fan 38 on struts 60
and below the fan and cylindrical member, there is a circular hole
in the plate 46 giving access to a plurality of channels 62 formed
by radial extending ribs 64. The plate 46, ribs 64 and base plate
66 form a circular finned air diffuser through which the air is
forced as shown by the arrows.
The overall case of the machine comprising the upper cylindrical
glass or plastic portion 10 and the base designated generally 68 is
effectively sealed and ventilated by one of the following means. In
the preferred embodiment, the upper glass cap 70 FIG. 2 is made of
a thermopane material having a sealed air space therein and the
lower portion comprises mating glass containers forming a capsule
inner body 72 and a capsule outer body 74 and a seal 76 disposed
between them at the bottom made of a silica gel or similar material
well known in the industry for preventing fogging of the insulating
air space provided between the bodies. Mullions are provided (not
shown) around the ports forming the openings (which are covered by
the doors) in order to provide an adequate seal. The cap 70 and
bodies 72, 74 are held together by any suitable means, such as
adhesive.
The base is fully insulated as shown at 78 and within the insulated
portion the thermoelectric modules 80 are mounted. Such modules are
known and are disclosed in my prior patent and applications
referenced above and can be wired for reverse polarity as described
in my prior applications. Indeed the thermoelectric modules of this
application are wired for reverse polarity and are controlled by
thermostats (shown in part at 82). However, no separate wiring
diagram will be disclosed herein for the thermostats modules, fan,
motor or any other part, since each circuitry would be obvious in
view of my prior disclosure and forms no part of this
invention.
A new feature shown in this embodiment is the provision for cooling
the cold shoes or blocks 84 attached to each of the thermoelectric
modules. These blocks are attached in any suitable way allowing for
heat transfer, such as by adhesive, and each of the blocks is bored
and tapped for reception of cooling coils 86, 88 to provide a
sealed water circuit as shown in FIG. 4. During the cooling cycle
the thermoelectric modules draw heat from the bottom plate 66 and
dissipate it into the cold blocks 84 from which it is removed by
virtue of the flowing water in the coil 86, 88. Fresh water is
inserted in the water inlet shown and the water is disposed of in
any manner.
In the alternate embodiment shown in FIG. 5, a separate air
distribution means is not included and therefore the fan 38 is
mounted to a spider frame 90 which is mounted to the bottom plate
directly and the air circulates between the bottom plate 66 and the
base portion 32.
In the further alternate embodiment shown in FIG. 6, defogging is
taken care of by means of an air channel 92 through which air is
continuously pumped (the air flowing in the direction of the
arrows, as shown from the air inlets through the air outlet port 94
in the doom 96). Since the device needs to be taken apart for
cleaning purposes, the doom 96 is sealed to the base 68 by a close
fit and the seal 98.
It will be understood that various changes in the details,
materials and arrangement of parts which have been herein described
and illustrated in order to explain the nature of this invention,
may be made by those skilled in the art within the principle and
scope of the invention as expressed in the following claims. For
example, in the embodiment shown in FIG. 1, a bottom switch 100 is
provided for manually starting or stopping the rotation of the
rotor (28,30,32). However, the rotor could rotate constantly at 1
or 2 rpm and be stopped automatically on opening of the door.
It will further be understood that the "Abstract of the Disclosure"
set forth above is intended to provide a non-legal technical
statement of the contents of the disclosure in compliance with the
Rules of Practice of the United States Patent Office, and is not
intended to limit the scope of the invention described and claimed
herein.
* * * * *