U.S. patent number 3,771,319 [Application Number 05/185,133] was granted by the patent office on 1973-11-13 for unitary drive for ice maker mechanism, defrost means and air flow means.
This patent grant is currently assigned to Whirlpool Corporation. Invention is credited to William J. Linstromberg, Duane C. Nichols.
United States Patent |
3,771,319 |
Nichols , et al. |
November 13, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
UNITARY DRIVE FOR ICE MAKER MECHANISM, DEFROST MEANS AND AIR FLOW
MEANS
Abstract
A refrigeration apparatus having an ice maker adapted to be
operated by a drive motor. Means are further provided for
permitting the drive motor to run in the manner of a clock for
timing the need for defrosting the refrigeration apparatus while
permitting intermittent operation of the ice maker under the
control of a bin level switch. The apparatus further includes air
flow means for flowing refrigerated air through the apparatus such
as for freezing water in the ice maker to form ice bodies therein.
The ice maker mechanism, defrost means, and air flow means are
driven by a single drive member, herein comprising an electric
motor.
Inventors: |
Nichols; Duane C. (Evansville,
IN), Linstromberg; William J. (Evansville, IN) |
Assignee: |
Whirlpool Corporation (Benton
Harbor, MI)
|
Family
ID: |
22679741 |
Appl.
No.: |
05/185,133 |
Filed: |
September 30, 1971 |
Current U.S.
Class: |
62/233; 62/234;
417/319 |
Current CPC
Class: |
F25D
21/004 (20130101); F25C 1/24 (20130101) |
Current International
Class: |
F25D
21/00 (20060101); F25C 1/22 (20060101); F25C
1/24 (20060101); F25c 001/04 () |
Field of
Search: |
;62/233,234,353,340,157,155 ;417/368,319 ;310/62,63 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wayner; William E.
Assistant Examiner: Tapolcai, Jr.; William E.
Claims
Having described the invention, the embodiments of the invention in
which an exclusive property or privilege is claimed are defined as
follows:
1. In a refrigeration apparatus having an ice maker mechanism,
means for periodically defrosting the apparatus including a timing
control, and air flow means for circulating refrigerating air in
the apparatus, drive means comprising: a single electric drive
motor; first means for connecting said motor to said mechanism for
cyclically driving said mechanism to form and harvest ice bodies;
second means for connecting said motor to drive said timing control
of the defrosting means for periodically defrosting the apparatus;
and disconnectable third means connecting said motor to said air
flow means for driving said air flow means for selectively
circulating refrigerating air in the apparatus.
2. The refrigeration apparatus of claim 1 including means for
disconnecting said third connecting means during operation of said
defrosting means.
3. The refrigeration apparatus of claim 1 wherein said drive motor
is positioned to be cooled by the air flowed by air flowing
means.
4. The refrigeration apparatus of claim 1 wherein means are
provided responsive to operation of said defrosting means for
effecting disconnection of said third connecting means for
precluding operation of the air flow means during a defrost
operation.
5. The refrigeration apparatus of claim 1 wherein said ice maker
mechanism and defrosting means include control means disposed
within housing means and said drive motor is disposed exteriorly of
said housing means.
6. In a refrigeration apparatus having an ice maker mechanism,
means for periodically defrosting the apparatus including a timer,
and air flow means for circulating refrigerating air in the
apparatus, drive means comprising: a single electric drive motor;
first means for connecting said motor to said mechanism for
cyclically operating said mechanism to form and harvest ice bodies;
second means for connecting said motor to said defrosting means for
periodically defrosting the apparatus; and third means connecting
said motor to said air flow means for circulating refrigerating air
in the apparatus, said third connecting means comprising
disconnectable means for selectively operating said air flow means,
and brake means for braking said air moving means upon
disconnection of said third connecting means.
7. The refrigeration apparatus of claim 6 wherein said third
connecting means comprises a first magnetic coupling element
carried for rotation with said air flow means, a second coupling
element connected for rotation with said drive motor, said brake
means comprises a fixedly positioned first brake element, a second
brake element carried for movement with said air flow means, said
third connecting means further defining means for selectively
positioning said elements for concurrently coupling said coupling
elements and preventing braking of said first brake element by said
second brake element, or for concurrently uncoupling said coupling
elements and causing braking of said first brake element by said
second brake element.
8. In a refrigeration apparatus having an ice maker mechanism,
means for periodically defrosting the apparatus including a timer,
and air flow means for circulating refrigerating air in the
apparatus, drive means comprising: a single electric drive motor;
first means for connecting said motor to said mechanism for
cyclically operating said mechanism to form and harvest ice bodies;
second means for connecting said motor to said defrosting means for
periodically defrosting the apparatus; and third means connecting
said motor to said air flow means for circulating refrigerating air
in the apparatus, said drive motor being provided with oppositely
projecting drive shaft means, said ice maker mechanism and
defrosting means being connected by said first and second
connecting means to one of said drive shaft means, and said air
flow means being connected by said third connecting means to the
other of said drive shaft means.
9. In a refrigeration apparatus having an ice maker mechanism, and
means for periodically defrosting the apparatus including a timing
control, drive means comprising: a single drive member; first means
for connecting said drive member to said mechanism for cyclically
driving said mechanism to form and harvest ice bodies; second means
for connecting said drive member to drive said timing control of
the defrosting means for periodically defrosting the apparatus;
means for conducting refrigerated air to send refrigeration
apparatus and said ice maker mechanism; and disconnectable third
means connecting said drive member to drive selectively rotatable
means for effecting another function in the operation of the
refrigeration apparatus.
10. The refrigeration apparatus drive means of claim 9 wherein said
means for performing said another function comprises means for
forcibly flowing the refrigerated air through said conducting
means.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to refrigeration apparatus and in particular
to refrigeration apparatus provided with an automatic ice maker,
automatic defrost means and forced air circulation means.
2. Description of the Prior Art
One improved form of refrigeration apparatus having automatic means
for making and harvesting ice bodies is shown in our copending
application for U.S. Ser. No. 223,716 for a Drive Motor-Defrost
Timer for Refrigerator filed Feb. 4, 1972, now issued on U.S. Pat.
3,718,794 and downed by the assignee hereof, said application Ser.
No. 223,716 being a continuation of abandoned application Ser. No.
46,921 filed June 17, 1970. In the structure disclosed in said
application, an electrical drive motor is provided for operating
both an automatic ice maker and a defrost timer control. The
operation of the automatic ice maker is periodically interrupted
when the ice bodies in the collecting bin reach a preselected full
level. However, it is desirable to operate the drive motor
substantially continuously, i.e., in the manner of a clock, to time
the intervals between the desired defrosting operations effected by
the defrost control. The operation of the drive motor may,
therefore, be actually continuous, or at least continuous during
the operation of the compressor so as to have a clock based on
compressor running time for controlling the defrost cycle. These
two different continuous timing operations are conventional in the
art.
In another well known form of refrigeration apparatus in which such
ice makers are provided, air flow means are provided for use in
effecting a substantially frost-free operation of the apparatus.
Thus, the air flow means effects a flow of all refrigerated air
through the chamber in which the ice maker apparatus is disposed to
maintain the chamber at a selected refrigerated temperature as well
as to effect freezing of the water to form ice bodies in the mold
of the ice maker. The flow of the air through the apparatus is such
that the major portion of moisture condensing in the apparatus
condenses on the evaporator as the coldest part of the system,
thereby effectively maintaining the exposed parts of the
refrigerator in the refrigerator and freezer chambers relatively
frost-free. The evaporator, however, must be periodically defrosted
to remove the collected frost and as discussed above, automatic
defrost timers such as that shown in the above-identified copending
application are provided to effect such defrosting.
SUMMARY OF THE INVENTION
The present invention comprehends an improvement over the structure
disclosed in our above-identified co-pending application whereby
the drive motor is further utilized to comprise the means for
driving the air flow means. Thus, a single drive motor may be
employed in the present refrigeration apparatus for effecting the
periodic operation of the automatic ice maker, the timing operation
of the automatic defrost control, and the driving of the air flow
means such as in effecting a frost-free operation of the
apparatus.
The invention further comprehends the provision of means for
selectively disengaging the air flow means from the drive motor
such as during a defrosting operation to avoid circulation of warm
air through the refrigerated chambers. The disconnecting means may
comprise a cam operated clutch, which in the illustrated embodiment
comprises a magnetic clutch having axially relatively displaceable
driver and driven magnetic elements.
The invention further comprehends locating the single drive motor
in the path of air flow for further improved efficiency in
operation of the apparatus by maintaining the motor at a relatively
low temperature.
Thus, the present invention comprehends an improved low
maintenance, low cost structure providing the multiplicity of
refrigeration apparatus functions discussed above in a novel and
simple manner.
While the illustrated invention comprehends that the additional
function effected by the single electric drive motor be the air
flow function, in its broadest scope, the invention contemplates
the utilization of the drive motor not only for operating the
automatic ice maker and defrost timer control, but further for
operating further devices in the refrigeration apparatus as may be
desired.
More specifically, the invention comprehends providing in a
refrigeration apparatus having an ice maker mechanism, means for
periodically defrosting the apparatus including a timer, and air
flow means for circulating refrigerating air in the apparatus,
drive means comprising a single electric drive motor, first means
for connecting the motor to the mechanism for cyclically operating
the mechanism to form and harvest ice bodies, second means for
connecting the motor to the defrosting means for periodically
defrosting the apparatus, and third means connecting the motor to
the air flow means for circulating refrigerating air in the
apparatus to cool the apparatus and to freeze water in the
mechanism for forming the ice bodies therein.
BRIEF DESCRIPTION OF THE DRAWING
Other features and advantages of the invention will be apparent
from the following description taken in connection with the
accompanying drawing wherein:
FIG. 1 is a fragmentary side elevation of a refrigeration apparatus
having an ice maker mechanism, a defrost control, and an air flow
means driven by a single drive member, embodying the invention;
FIG. 2 is a fragmentary vertical enlarged section with the
structure arranged for driving the air moving means; and
FIG. 3 is a view similar to that of FIG. 2 but with the structure
arranged for discontinuing operation of the air moving means.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the exemplary embodiment of the invention as disclosed in the
drawing, an ice maker generally designated 10 is shown to comprise
an automatic ice maker mechanism 11, a defrost timing control 12,
an air flow means 13, and a drive 14 for driving each of the ice
maker mechanism 11, defrosting timing control 12, and air flow
means 13. Herein, drive means 14 comprises an electric motor having
a stator 15 and a rotor 16. Rotor 16 is provided with drive shaft
means comprising oppositely projecting shaft portions 17 and 18, as
shown in FIG. 2.
The ice maker mechanism and defrost timing control 12 correspond to
that shown in our U.S. Pat. No. 3,714,794 discussed above, the
disclosure and drawing of which application is incorporated by
reference herein for illustrating the specific details of the
respective mechanism 11 and control 12. Such details need not be
understood for purposes of understanding the present invention,
however, it only being necessary to understand that the disclosed
structures are operated from a single output shaft of the drive
motor as disclosed in said application, in a manner identical to
the operation of ice maker mechanism 11 and defrost control 12
herein with the shaft 19 of the present structure shown in FIG. 2
corresponding to the output drive shaft of the motor of said prior
application.
In the present embodiment, the motor shaft portion 17 carries a
thin gear 20 meshing with a wide gear 21 on shaft 19 for maintained
engagement therebetween notwithstanding an axial displacement of
gear 20 by an axial displacement of rotor 16 and shaft portions 17
and 18, as will be described in greater detail here following.
Referring now to FIGS. 2 and 3, rotor shaft portion 17 is
journalled in a suitable bearing 22 and rotor shaft portion 18 is
journalled in a suitable bearing 23 for limited axial movement of
the shafts therethrough. Stator 15 carries a bracket 24 having a
brake flange portion 25 disposed outwardly of bearing 23. The rotor
shaft portion 18 carries a drive hub 26 carrying a magnetic drive
element 27 selectively engageable with a magnetic plate 28 carried
on a cup-shaped fan blade hub 29 of fan 13. The fan blade hub, in
turn, carries an annular brake shoe 30 which is secured to a
tubular portion 31 of the fan hub 29 by suitable means such as
screws 32.
The normal operating position of the apparatus is as shown in FIG.
2 wherein the rotor 16 is disposed to the left relative to the
centerline of the status 15 with the shaft portion 17 engaging a
low face cam portion 33 of a gear 34. In this arrangement, the
magnet 27 is magnetically locked with follower plate 28 so as to
drive fan 13 with the rotor 16. Concurrently with such driving of
the fan, gear 20 is rotated so as to operate ice maker mechanism 11
and defrost timer 12 through the output shaft 19. In this
arrangement, the brake shoe 30 is spaced axially from brake flange
25 to permit free rotation of the motor.
Thus, the apparatus 10 comprehends an improved refrigeration
apparatus wherein a single drive motor 14 drives the ice maker
apparatus 11, defrost timer 12, and the evaporator fan 13 in their
conventional modes of operation. when defrost timer 12 times out to
effect a defrost operation, it is also desirable to concurrently
stop the fan 13 thereby to prevent flowing of relatively warm air
from the defrosting evaporator to the various refrigerator
chambers. To this end, the gear 34 is provided with a high face cam
portion 35 which is caused to engage the shaft portion 17, as shown
in FIG. 3, by a suitable rotation of gear 34 as by a gear 36 driven
by defrost timer 12 to move the rotor shaft portions 17 and 18 to
the right, as shown in FIG. 3, during the defrost operation. Thus,
the magnetic clutch defined by magnet 27 and follower plate 28 is
broken thereby to discontinue driving of fan 13. At the same time,
brake shoe 30 is urged to the right into engagement with brake
flange 25 to positively stop the fan 13 during the defrost
operation. Thus, the motor 14 may continue to operate while yet
disengaging fan 13 during the defrost cycle.
The bearing means 23 journalling shaft portion 18 may comprise a
pair of bearings including blade bearing 37 and motor bearing 38
disposed radially inwardly of an oil cup 39 for effecting
lubrication of the bearings. The braking action is effected by
movement of the shaft 18 axially through the bearings with the
braking force being controlled by the action of the spaced magnet
27 magnetic plate 28 structure continuing to exert a force tending
to pull the fan hub 29 toward the right, as seen in FIG. 3.
The motor rotor 16 is magnetically self-centering so that upon
movement of gear 34 back to the position of FIG. 2, the motor shaft
portions 17 and 18 will become again disposed with the magnetic
clutch 27-28 operative to drive the fan 13.
As will be obvious to those skilled in the art, other forms of
clutches and brakes may be employed within the broad scope of the
invention. Illustratively, electro-mechanical or thermally
responsive devices may be employed for effective braking of the fan
13 and other suitable mechanical clutches may be employed for
effecting suitable operation of the fan 13.
As the thin gear 20 maintains its meshed relationship with wide
gear 21 in all positions of the movement of rotor 16, the operation
of shaft 19 is identical to the operation of the output shaft of
the motor in our above-identified copending application.
Resultingly, the automatic ice making and defrost timing cycles
disclosed therein may be identically effected by shaft 19 in
connection with the ice maker 11 and defrost timer 12 herein.
Thus, as shown in the drawing and as discussed above, the present
invention comprehends an improved refrigeration apparatus. More
specifically, the present invention comprehends that the drive
means for an automatic ice maker and defrost control comprises a
single electric drive motor having an axially movable rotor for
selectively further controlling the operation of the evaporator fan
when desired.
The foregoing disclosure of specific embodiments is illustrative of
the broad inventive concepts comprehended by the invention.
* * * * *