U.S. patent application number 13/944071 was filed with the patent office on 2015-01-22 for lighted refrigerator shelf with overmold.
The applicant listed for this patent is Whirlpool Corporation. Invention is credited to MATTHEW P. EBROM, ERIC ANDREW HILL, JAMES W. KENDALL, TIMOTHY T. MURPHY, HARI NAIR, BRIAN N. RADFORD.
Application Number | 20150023000 13/944071 |
Document ID | / |
Family ID | 50513675 |
Filed Date | 2015-01-22 |
United States Patent
Application |
20150023000 |
Kind Code |
A1 |
KENDALL; JAMES W. ; et
al. |
January 22, 2015 |
LIGHTED REFRIGERATOR SHELF WITH OVERMOLD
Abstract
A shelf for supporting items including but not limited to in
refrigerated appliances includes in an integrated fashion a
supporting surface and around the perimeter of the supporting
surface of similar dimensions. A lighting subassembly is mountable
to or integrated in the framing. Electrical power can be through
touchless or contact electrical communication. In one form the
supporting surface is a single substantially clear plate. In
another form the supporting surface is a thin glass top layer and a
bottom layer overmolded with the framing to the thin glass top
layer.
Inventors: |
KENDALL; JAMES W.; (Mt.
Propsect, I) ; EBROM; MATTHEW P.; (Holland, MI)
; HILL; ERIC ANDREW; (Holland, MI) ; MURPHY;
TIMOTHY T.; (Holland, MI) ; NAIR; HARI; (St.
Joseph, MI) ; RADFORD; BRIAN N.; (Stevensville,
MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Whirlpool Corporation |
Benton Harbor |
MI |
US |
|
|
Family ID: |
50513675 |
Appl. No.: |
13/944071 |
Filed: |
July 17, 2013 |
Current U.S.
Class: |
362/92 ;
29/592.1; 362/231; 362/249.01; 362/249.02 |
Current CPC
Class: |
Y10T 29/49002 20150115;
F25D 27/00 20130101; F25D 25/02 20130101 |
Class at
Publication: |
362/92 ;
362/249.01; 362/249.02; 362/231; 29/592.1 |
International
Class: |
F25D 27/00 20060101
F25D027/00 |
Claims
1. A shelf comprising: a. an at least partially light transmissive
supporting plate having a thickness and a perimeter edge; b. a
framing surrounding the perimeter edge of the supporting plate, the
framing having a thickness not substantially greater than the
thickness of the supporting plate and an outward extension not
substantially greater than the perimeter edge; c. a lighting
subassembly along at least one portion of the framing or supporting
plate, the lighting subassembly and comprising one or more light
sources having light output directed through or along the
supporting plate; d. a connection to electrical power between the
lighting subassembly and at or near the framing; and e. shelf
mounting brackets associated with the framing; f. so that size and
proportion of the supporting plate to the framing and lighting
subassembly of the framing provide an integrated storage surface,
local illumination, and thin appearance when supported by mounting
brackets in a space.
2. The shelf of claim 1 wherein the supporting plate comprises
glass.
3. The shelf of claim 1 wherein the supporting plate comprises
plastic.
4. The shelf of claim 1 wherein the supporting plate comprises a
thin top layer of glass and a thicker bottom layer of plastic.
5. The shelf of claim 4 wherein the top and bottom layers are at
least substantially optically clear.
6. The shelf of claim 1 wherein the framing comprises a pair of
frame members.
7. The shelf of claim 6 wherein at least one of the frame members
comprises metal.
8. The shelf of claim 1 wherein the framing comprises overmolded
plastic.
9. The shelf of claim 1 wherein the framing comprises plastic.
10. The shelf of claim 9 wherein a part of the plastic comprises a
light pipe.
11. The shelf of claim 4 wherein the framing comprises overmolded
plastic and the bottom layer of the supporting layer is a part of
the overmolded plastic.
12. The shelf of claim 1 wherein the light output of the lighting
subassembly is directed substantially through the supporting
plate.
13. The shelf of claim 1 wherein the light sources comprises
LEDs.
14. The shelf of claim 13 wherein the LEDs are arranged in one or
more substantially linear arrays on or at least one of the framing
or the supporting plate.
15. The shelf of claim 13 wherein at least two LEDs have different
color outputs.
16. The shelf of claim 1 further comprising an optical component
associated with the light output of the light sources.
17. The shelf of claim 16 wherein the optical component comprises a
pattern on the supporting plate.
18. The shelf of claim 1 wherein the connection to electrical power
comprises a conductor terminating in a conductive contact at or
near the framing.
19. The shelf of claim 1 wherein the connection to electrical power
comprises a contactless connection.
20. The shelf of claim 19 wherein the contactless connection
comprises inductive, capacitive, or magnetic power transfer.
21. The shelf of claim 1 wherein the connection to electrical power
is adapted to transfer electrical power and/or data and further
comprising a sensor at or near a shelf which provides data to
inform a lighting effect from the light sources at the shelf.
22. The shelf of claim 1 in combination with a supporting structure
adapted to receive supporting brackets to suspend the shelf in
space.
23. The combination of claim 22 wherein the supporting structure
comprises a refrigeration appliance cabinet.
24. A refrigerator shelf comprising: a. a glass plate providing an
upper shelf surface and having a perimeter edge; b. an overmolded
plastic framing having a perimeter on the same order of size as the
perimeter edge of the glass plate, the overmolded framing
comprising an undersupport for the glass plate; c. a mounting
location for a light source on at least one of the glass plate and
the framing; d. an electrical power connection to the mounting
location for the light source; e. so that the shelf is an
integration of the glass plate, the overmolded framing, and
electrical power connection for providing lighting at and around
the shelf.
25. The refrigerator shelf of claim 24 further comprising a light
source mounted to the mounting location on or in the framing.
26. The refrigerator shelf of claim 25 wherein the light source
comprises a plurality of LEDs.
27. The refrigerator shelf of claim 26 wherein the LEDS comprise a
linear array is along the front edge or along the undersupport of
the framing.
28. The refrigerator of claim 24 wherein the glass plate and
plastic plate each has a thickness and is at least substantially
light transmissive and the overmolded framing is less than twice
the thickness of and is substantially close to the perimeter of the
glass plate.
29. The refrigerator shelf of claim 24 wherein the electrical power
connection comprises an inductive coupler for receiving electrical
power for operating the light source.
30. The refrigerator shelf of claim 29 wherein the inductive
coupler comprises a thin receiving antenna along the glass plate,
plastic plate, or framing.
31. The refrigerator shelf of claim 24 in combination with and
mounted in a refrigerator cabinet, wherein the inductive coupler is
adapted for operative communication inductively with an electrical
power radiating antenna on or in the cabinet.
32. The refrigerator shelf of claim 24 wherein the power connection
comprises a conductive element on the plastic plate or overmolding,
the conductive element having a distal end adapted for conductive
communication with an electrical power source in the cabinet.
33. A refrigerator shelf made according the process comprising: a.
producing a plastic plate having a perimeter; b. overmolding light
pipe material to at least a portion of the perimeter of the plastic
plate; c. mounting a light source at the overmolding light pipe
material; and d. applying a power connection to the plastic shelf
to the light source.
34. The refrigerator shelf of claim 33 in combination with a
mounting location in a refrigerator cabinet.
35. The refrigerator shelf of claim 33 further comprising
overlaying a glass plate over the plastic plate to provide a glass
upper surface for the shelf.
36. The refrigerator shelf of claim 35 wherein the glass plate is
on the order of 1 mm thick.
37. The refrigerator shelf of claim 33 further comprising building
into the overmolded light pipe material structure for mounting to
mounting brackets that allow adjustable height mounting in the
refrigerator cabinet.
38. A method of lighting shelving comprising: a. integrating light
sources into at least one of a substantially optically clear
supporting plate or framing of the supporting plate, wherein the
framing is not substantially thicker and does not extend
substantially from the plate; b. providing electrical power to the
light sources by contact or contactless transmission; c. operating
the light sources to give the appearance of luminance at and about
the supporting plate and/or illuminate surrounding areas or
surfaces.
39. The method of claim 38 wherein the supporting plate comprises a
thin glass upper layer and an overmolded bottom layer.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to refrigerators, freezers,
refrigerator/freezers, other appliances, or other structures that
have shelving, and in particular, lighting relative to that
shelving.
[0003] 2. State of the Art
[0004] A variety of types of shelving exists. Some are for storage.
Some are for display of objects. Some are exposed as with of book
shelving without doors. Some are enclosed. An example would be
inside a cabinet with closeable doors.
[0005] It can be desirable to provide lighting or illumination at
or near shelving. However, there are many competing factors. Some
are subtle. For example, the shelving material must be structurally
robust enough to support what is intended to be stored there. This
tends to require bigger, stronger, or thicker components. Another
factor is space. Most times minimization of space occupied by the
shelving components leaves more space for storage or display.
Another factor can be presentation or access. In many cases, the
ability to reach objects on the shelf is desirable. Sometimes
visibility is important. Transparent shelves are sometimes used
towards that end. Another factor is aesthetics. Form factor,
proportion, and optical effects can enhance aesthetics and,
sometimes, the functionality at the same time. A further aspect is
flexibility of storage. It is many times desirable that the shelves
be moveable. One example are outwardly slideable shelves. Another
would be complete removal and placement at a different vertical
height.
[0006] One particular example of shelving is adjustable shelves in
refrigerators, freezers, or refrigerator freezers. A conventional
shelf provides a storage surface for refrigerated food items. It
can span part or all of a space inside the appliance cabinet. One
conventional way to vertically adjust such shelves is along
vertical rails or tracks that have different mounting
elevations.
[0007] Some method of at least partial illumination is typical in
the interiors of such appliances to help the user identify what is
being stored. However, several factors regarding refrigerated
appliances make design of such illumination much more than trivial.
As stated, storage space is at a premium. Therefore, any source of
illumination should take up as little storage space as possible.
Conditions inside the cabinet are cold or even subfreezing (if in a
freezer compartment). Thus, the illumination source must be able to
work and last in that environment. Also, food items can be in
liquid or semi-solid form and, therefore, protection of the
lighting source and electrical connections from those substances is
usually important. Also, it is not necessarily easy to route
electrical power to such light sources.
[0008] Still further, cost is a factor with most appliances,
particularly consumer appliances. Therefore, although the best
illumination would utilize a number of light sources distributed
throughout the cabinet, this is normally impractical from a cost
perspective. Additionally, more light sources may translate into
higher energy costs during operation.
[0009] Therefore, there are competing factors involved in
illumination of the interior of such appliances.
[0010] One known configuration places an illumination source in or
on the liner of the appliance. This can make it difficult to
adequately illuminate all parts of the compartment involved.
[0011] Attempts at placing illumination sources inside the cabinet
space includes mounting light sources on shelves. However sources
like incandescent or fluorescent sources take up substantial room.
They require relatively large sockets or electrical connections.
Additionally, mounting on a shelf that is removable or horizontally
adjustable raises issues of how to reliably supply electrical power
to the lights.
[0012] A variety of attempts at shelf-mounted lighting have been
made. Some utilize relatively smaller sources such as LEDs. Some
utilize what could be called a power strip or power rail along the
mounting bracket locations for adjustable shelves. A conductive
contact on the shelf contacts the conductive vertical rail to
supply electrical power.
[0013] However, many of these systems tend to be somewhat complex.
Some involve a number of parts. And some are not perhaps as
economical as might be desirable. The lighting sources tend to be
readily identifiable by a viewer.
[0014] Therefore, there remains a need in the art for alternatives
or improvements regarding interior lighting of such appliances.
There is a need for improved visibility, aesthetics, and
economy.
SUMMARY OF THE INVENTION
[0015] It is therefore a principle object, feature, aspect, or
advantage of the present invention to improve over or solve
problems and deficiencies in the art.
[0016] Further objects, features, aspects, and advantages of the
invention relate to shelving that includes an illumination source
which: [0017] a. provides good visibility via illumination at or
near the shelf but also good visibility to and through the shelf to
even other parts of the surrounding structure or space; [0018] b.
provides an integrated system of shelf storage position and
illumination including mounting and supplying electrical power to
the illumination sources; [0019] c. provides good aesthetics
regarding shelving and/or areas around the shelving; [0020] d.
provides flexibility regarding manufacture, durability, economy;
[0021] e. provides good flexibility regarding type and effects of
illumination; [0022] f. provides good utilization of useable space;
[0023] g. promotes good efficacy of illumination; [0024] h.
promotes ability for economical use of electrical energy; [0025] i.
allows for beneficial use with a variety of shelving structures and
storage cabinets or appliances with a variety of different internal
storage components; and/or [0026] j. can be applied to different
structures, including enclosable spaces or open shelving.
[0027] One aspect of the invention is a shelf having a transparent
or at least partially light transmissive storage surface, a
perimeter frame, and a lighting subassembly, wherein the frame
includes forms or receivers for complimentary receipt or
integration of mounting brackets. The lighting subassembly is at or
along at least one edge of the supporting surface or arrayed on the
surface. The frame and supporting surface are relatively thin.
Electrical power to the lighting subassembly allows the lighting
assembly to provide illumination through, at, or around the
shelving.
[0028] Another aspect of the invention includes a refrigerator
shelf having a top glass storage surface, a perimeter frame, and a
lighting subassembly. The frame includes forms or receivers for
complementary receipt or integration of mounting brackets.
Electrical power to the lighting subassembly can be by wireless
transfer or contact transfer to a source of electrical power
available in the cabinet of the appliance. The framing of the glass
supporting surface can include metal, plastic, or other materials
that form framing components that are relatively thin to present a
relatively similar thickness for the entire shelf for optimal
utilization of space and aesthetics, but also carry a lighting
subassembly and protect and hide the side edges of the supporting
surface. The lighting subsystem can have light output that
essentially distributes light through or along the glass supporting
surface. It provides the look of a glass shelf essentially
suspended in space but provides illumination at or near the
supporting surface for the customer to identify the contents of the
shelf. Alternatively, the framing of the glass supporting surface
can be overmolded plastic.
[0029] In another aspect of the invention, the upper glass surface
can have a relatively thin glass plate to which is overmolded an
undersupport at least partially light transmissive plate of
essentially the same perimeter size as the thin glass plate and one
or more overmolded framing edges that protect edges of the thin
glass plate. A lighting subassembly can be mounted to or overmolded
into one of the molded frame edges or on the surface. The
overmolding frame edges can include forms or receivers for
complementary receipt of mounting brackets for the shelf.
Electrical power can be through wireless transfer from a source of
electrical power in the cabinet.
[0030] In another aspect of the invention a transparent or at least
partially light transmissive supporting plate can be framed by
overmolded plastic that includes one or more light sources or a
lighting subassembly. A power connection is applied or mounted
along the plate or framing and adapted for operative connection to
a source of electrical power to operate the light source(s). The
components are integrated in function and appearance.
[0031] These and other objects, features, aspects, and advantages
of the invention will become more apparent with reference to the
accompanying specification and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] FIG. 1 is a perspective view of a cabinet in which are
supported one or more shelves that are adjustable vertically. In
this particular example, the cabinet is a refrigerator/freezer
fresh food compartment. The shelves are one example of one form the
invention can take.
[0033] FIG. 2A is an enlarged perspective view of the shelves of
FIG. 1 from a bottom and left view point.
[0034] FIGS. 2B and 2C are black/white and color photographs
respectively of the shelves of FIG. 2A illustrating how a lighting
subassembly on and optical pattern applied to each shelf provides
at least the appearance of luminance from each shelf, and aesthetic
and functional benefits.
[0035] FIG. 3A is a still further enlarged perspective view of a
single shelf from FIG. 2A from a top and center perspective.
[0036] FIGS. 3B and 3C are black/white and color photographs
respectively of the shelf of FIG. 3A illustrating how the lighting
subassembly and applied optical pattern provides at least the
appearance of luminance from each shelf, and aesthetic and
functional benefits.
[0037] FIG. 4 is an exploded view of the components of the shelf of
FIG. 3B.
[0038] FIG. 5 is an enlarged partial sectional view of the
assembled front end of the shelf of FIG. 3A taken along line 5-5 of
FIG. 3A.
[0039] FIG. 6A is an assembled perspective view of an alternative
embodiment of a shelf according to the present invention, in
particular, a quite thin top glass plate to which is overmolded an
undersupport plate/protective edge framing giving the appearance
and properties of glass on the top side of the shelf but using
plastic to support the thin glass layer and protect its edges. A
lighting subassembly is overmolded into or mounted to the
framing.
[0040] FIG. 6B is an exploded view of the embodiment of FIG. 6A
with diagrammatic depictions of power and control components for
the lighting subassembly carried on the shelf.
[0041] FIG. 7 is an enlarged side elevation view of FIG. 6A.
[0042] FIG. 8A is a sectional view of one possible form of the
assembled shelf of FIG. 6A taken along line 8-8 of FIG. 6A, in
particular, the lighting subassembly is overmolded and encapsulated
in a front frame portion.
[0043] FIG. 8B is similar to FIG. 8A but shows one possible
alternative form of the assembled shelf of FIG. 6A taken along line
8-8 of FIG. 6A, in particular, the lighting subassembly is
separately mounted in a front frame portion but projects light
substantially into the shelf assembly.
[0044] FIG. 8C is similar to FIG. 8B but shows the lighting
subassembly projecting light angularly down and below the
shelf.
[0045] FIG. 9 is a sectional view of the shelf of FIG. 6A taken
along line 9-9 of FIG. 6A.
[0046] FIG. 10A is an exploded view similar to FIG. 6B but showing
a slightly alternative embodiment wherein plural LED lighting
subassemblies are mounted on the thin glass plate to which is
overmolded framing 90.
[0047] FIG. 10B is a sectional view basically through the center of
the assembled combination of FIG. 10A in slightly enlarged
fashion.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0048] The patent or application file contains at least one drawing
executed in color. Copies of this patent or patent application
publication with color drawing(s) will be provided by the Office
upon request and payment of the necessary fee.
Overview
[0049] For a better understanding of the invention, several
exemplary embodiments will be described in detail below. It is to
be understood that these are but a few examples of forms and
configurations the invention can take and are neither inclusive nor
exclusive.
[0050] The exemplary embodiments will be described in the context
of a refrigerated appliance as illustrated in FIG. 1. It is to be
understood, however, that the illuminated shelves can be applied to
refrigerators, freezers, or refrigerator/freezers of other
configurations. Still further, the illuminated shelves could be
applied to other appliances with enclosures or adjustable shelving.
Still further, any shelving for storage or display could utilize
the principles of the invention.
[0051] The exemplary embodiments will also be described in the
context of light sources that are LEDs. It is to be understood,
however, that other lighting sources are possible.
Exemplary Embodiment 1
[0052] With reference to FIGS. 1-5, a first exemplary embodiment of
the invention comprises plural shelves 30 that can be mounted along
vertical mounting rails 22 in fresh food compartment 16 of a
refrigerator/freezer appliance 10. One example one such an
appliance is shown in FIG. 1. Multiple shelves 30 could be mounted
at different vertical heights and in different positions in fresh
food compartment 16.
[0053] FIG. 1 illustrates a French door/bottom freezer type
refrigerator 10 having a cabinet 12. The fresh food compartment is
defined by a liner 15 such as are well known in the art. Doors 14L
and 14R (left and right) open and close off compartment 16. Freezer
compartment 18 can be a slide-out drawer.
[0054] Vertical rails 22 include slots or mounting apertures 24
along their lengths. Shelf mounting brackets 26 have rear ends with
hooked fingers that are complementary to slots 24 to allow such
brackets to be placed at various vertical heights inside
compartment 16. A pair of brackets 22 supports each shelf 30 and
allows selection of vertical elevation or mounting height in
compartment 16.
[0055] As is conventional in many such present appliances, a master
control board or programmable microprocessor 102 is built in to
cabinet 12 and can control a number of features and functions of
the appliance. One examples is control of cooling. Another is
adjustment of settings (e.g. temperature or features), some of
which are user selectable. An electrical power source 100
(connected to commercial electrical power) can also be available in
cabinet 12. A wiring harness or bus 104 is typical to route
electrical hardwire connections to various parts or locations in
cabinet 12.
[0056] FIGS. 2A-C illustrate one style of shelf (ref. no. 30A) that
can be used in appliance 10 of FIG. 1 from a bottom perspective
(this particular embodiment of shelf 30 is referred to by reference
number 30A). They show how brackets 26 support each shelf on
vertical rails 22. They also show the relatively thin profile of
each shelf as it extends out into the space of the fresh food
compartment. FIGS. 2B-C furthermore show that each shelf 30A
appears to be luminous or has illumination associated with it. As
can be appreciated from FIGS. 2B-C, in this configuration each
shelf has a substantially transparent main supporting area and the
illumination associated with it gives the appearance of the
supporting surface being luminous. Such a lighting scheme presents
plural shelves, each appearing to be lit up individually. This
presents an aesthetic overall appearance of the shelves hovering or
extended in the compartment space with illuminated horizontal
supporting surfaces. However the illumination is also functional.
It assists a user to see the location of each lighted shelf and
items supported on each shelf. Some of the light from a lighting
subassembly in each shelf also may/can illuminate other parts of
surfaces of the compartment or near the compartment. For example, a
soft illumination of portions of liner 15 can be seen in FIGS.
2B-C. Localized lighting at each shelf can save energy (compared to
generalized cabinet illumination).
[0057] As can also be seen by reference to these figures, each
shelf has the appearance of a glass shelf. Most of the area of each
shelf is transparent or substantially light transmissive. A thin
and relatively small surrounding frame work essentially
encapsulates and protects the perimeter edge of each shelf. The
thickness of the framing is not substantially greater than that of
the glass plate. It can be thicker, but not many times the
thickness such that it promotes the appearance of an integrated
shelf (both framing and supporting plate) that is relatively
consistent in thickness. However, that relatively small framework
takes up little space and presents a clean, aesthetically-pleasing
look for each shelf. The brackets that support each shelf are
relatively thin and small. The shelves basically appear to be
suspended in fresh food compartment 16. Additionally, their white
transmissivity allows a view through most of their area for
increased visibility of other parts of compartment 16.
[0058] FIGS. 3A-C show another optional feature possible with shelf
30A. Either its top surface 31 or its opposite bottom surface 32
(FIG. 2A) can include a layer, coating, application or printing in
some form that still allows the shelf to be substantially light
transmissive but also still allows a view through and optically
affects light that tries to pass through that central supporting
surface. Reference numbers 33, 34, 35, and 36 refer generally to
the front, back, left side, and right sides of overall shelf 30A.
In this example, that addition is a moire pattern or otherwise a
pattern that can diffuse some of the light that passes through the
light transmissive portion of shelf 30A or at least present an
interesting visual appearance. One example is a printed or applied
brand name or logo. This could include words, numbers, graphic
designs, or combinations. Here the moire pattern is a mesh-like
pattern, which has a configuration that appears to be roughly
parallel dark and light bands. Other patterns can be applied to
produce different appearance and optical effects in combination
with illumination emanating from or at the shelf. It could be
printed, silk-screened, etched or otherwise applied.
[0059] As further indicated in FIGS. 4 and 5, shelf 30A includes a
light subassembly 70. Assembly 70 comprises a printed circuit board
(PCB) or mounting board 72. On one side is operatively mounted a
linear array of LEDs 74. A light assembly wiring harness or bus 76
provides hardwire electrical communication between each LED 74 on
board 72 and a termination. In this exemplary embodiment, the
distal termination end of harness 76 includes an electrical contact
or connection 78. This allows power and information to be
electrically communicated to and from LEDs 74.
[0060] Further features of shelf 30A are as follows. The supporting
surface of each shelf 30A comprises a glass plate 40. Glass plate
40 has top, bottom, front, back, left side, and right side edges
41, 42 (FIGS. 5), 43, 44, 45, and 46 respectively. It can be
tempered glass on the order 2-3 mm thick and 375 mm.times.450 mm in
width and depth. Of course other shapes and sizes and even
configurations are possible. Moire or optical pattern 49 (FIG. 4;
see also FIGS. 2B-C and 3B-C) is on glass plate 40. Pattern 49 can
be a separate layer. It could be applied, printed, embossed, or
otherwise placed on either side (or both sides) of glass plate
40.
[0061] A top frame section 50 comprises a top horizontal flange 52
and a vertical outer flange 54. Vertical flange 54 would
essentially fit over and protect the perimeter edges of glass plate
40 when placed on top of glass plate 40.
[0062] A lower frame section 60 has a horizontal and vertical
flanges 62 and 64 which are complementary to and fit within
vertical flange 54 of top frame section 50 (see FIG. 5). As
indicated in FIGS. 4 and 5, top and bottom frame sections 50 and 60
would basically mate and sandwich glass plate 40 between them. The
frame halves 50, 60 would be connectable by screws 68 or other
fastening means through apertures in bottom frame 60 into tapped
receivers 58 extending from the bottom of top frame 50 to basically
encapsulate the edges of glass plate 40 and hold it in position.
Frames 50 and 60 could be made of metal. Other materials are
possible. The tolerances could be such that they closely match to
the perimeter of glass plate 40 and to each other to not add much
to the thickness to the glass plate 40 itself to provide that
integrated look as shown in FIGS. 1, 2A-C, and 3A-C. There could be
cushioning or gasket material on one or more of frames halves 50,
60 to cushion and further protect the edges of glass plate 40.
[0063] LED lighting assembly 70 can be mounted as illustrated in
FIG. 5 in a space between frames 50, 60 along the inside surface 56
of vertical wall 54 of top frame 50 in alignment with the front
edge 43 of glass plate 40. The optical axis 77 of each LED 74 can
be directed into front edge 43 and in the plane through glass plate
40 indicated at reference number 77 in FIG. 5 of glass plate 40.
Glass plate 40 would basically function as a light pipe or guide.
This would tend to direct or guide light energy from LEDs 74
through the interior of the entire area of plate 40. This would
provide illumination at or through and/or at least the appearance
of luminance from both sides of plate 40. This would help identify
objects on shelf 30A but also provide some level luminance or
illumination around shelf 30A. It also provides the appearance of
luminance or glow in glass plate 40.
[0064] LEDs 74 could simply turn on and off upon some instruction.
The instruction could simply be closing an electrical circuit from
electrical power with a manually operated on/off switch. It could
be from closing an electrical circuit directly from a switch that
senses when one of refrigerator doors 14L or 14R is opened or
closed. It could be by an activation signal from master control
102. The activation signal could be from any of a number of
triggers.
[0065] LED board 72 itself could include circuitry to have certain
controllable functions for LEDs 74. For example, on-board circuitry
could include hardware components that would respond to and actuate
certain operation of LEDs 74. An example would be an LED driver
circuit that could vary the intensity of any or all LEDs 74
according to instruction. The on-board circuitry could even include
another processor or controller (it also could be programmable). An
example would be a program that could flash or individually actuate
any LED 74 according to different possible sequences, intensities,
colors, etc.
[0066] Further examples would be the ability to alter the power in
voltage, current, or duty cycle to any LED 74 for various lighting
effects. There could also be different colored LEDs or types that
could be collectively operated or individually operated.
[0067] LEDs can have different light distribution output patterns.
For example, some are relatively wide beams and some are relatively
narrow beam. Selection of the LEDs and their output patterns, along
with the direction of their optical axes 77, allows the designer to
create different lighting effects with lighting subassembly 70. For
example, the optical axes could be substantially directed through
the interior of glass plate 40 by substantially total internal
reflection. Glass plate 40 would basically act as a light pipe or
guide, guiding at least a substantial amount of the light output of
LEDs 74 from glass plate front edge 43 to back edge 44.
Alternatively, the distribution pattern could be such that some
light from LEDs 74 moves through and across interior of plate 40
but some light refracts out to provide light energy outside of the
plane of plate 40.
[0068] Another option would be to direct the optical axes of LEDs
74 other than into an edge of glass plate 40. It could be generally
parallel along the top or bottom surface of glass plate 54. It
could be angularly away from the plane of glass plate 40. Different
LEDs 74 could be directed in different directions.
[0069] Examples of edge-lit shelving are described at U.S. Pat.
Nos. 6,210,013 and 8,322,873, which are incorporated by reference.
Another example of LED shelf lighting is described at U.S. Pat. No.
7,338,180 which is incorporated by reference herein. Details about
directing light into an edge of a light transmissive plate are set
forth.
[0070] As indicated in FIG. 5, board 72 could be mounted to frame
section 50 or 60 by any number of techniques including but not
limited to screws, bolts, adhesives, interference fit, or the like.
One example is shown in FIG. 4 (screws 75 through tabs 73 into
tapped receivers in frame 50); another is in FIG. 5 (board 72
adhered or mounted along inside surface 56 of vertical flange 56 of
frame 50). Other mounting techniques are possible. It can be
desirable that any fasteners not extend outside the outer surfaces
of frame sections 50 and 60.
[0071] As can be further understood, patterns such as the moire
pattern or other optical patterns could be selected according to
desire or need. Typical techniques may be etched into the glass or
ink applied to the glass surface. They could be utilized with a
selection of LEDs 74 and their output distribution patterns for a
variety of different lighting and optical effects.
[0072] FIG. 4 also shows mounting brackets for the shelf assembly.
Brackets 26 could be solid or wire. They could be separate from
shelf 30A or unitary or integral to shelf 30A. If separate (as
shown in FIG. 4), they could basically have a top edge or flange
that would complementarily work with frame sections 50, 60 and
glass plate 40 in assembled form to support that assembly would sit
and hold against at least lateral movement and downward movement.
There could also be cooperating structure to allow the shelves to
be slid forward or removed. Examples of such features are known in
the art.
[0073] It could therefore be seen that shelves 30A of FIGS. 1-5 are
an integrated assembly that includes a glass supporting surface.
Such a surface has good aesthetic appeal, is easily cleanable, and
is considered by most customers to be hygienic. Glass also has
inherent optical properties that can attribute to the aesthetic
appearance both when LEDs 74 are on or not. Furthermore, the frame
halves 50, 60 provide a metal edge protection of glass 40 but do so
on a size scale that is similar to the thickness of glass plate 40.
They do not add much additional thickness to glass plate 40. Thus,
a pleasing overall appearance of dimensions and size proportions is
presented. This includes the supporting glass surface and the edge
protection of frame sections 50 and 60. In addition, built-in
integrated light subassembly 70 allows illumination and luminance
at and around shelf 30A to provide additional aesthetics. Still
further, brackets 26 can be formed to be complementary to and
retain the appearance of a glass supporting surface floating in a
fresh food compartment. In addition, the embodiment promotes good
visibility or optical clarity of not only items supported on shelf
30A but on other adjacent shelves and, if appropriately configured,
throughout the fresh food compartment.
[0074] The embodiment also promotes economy by allowing a
relatively few number of pieces to be assembled in an integrated
fashion for a shelf that could be fixed into place or removable,
and optionally adjustable vertically or horizontally. This includes
carrying with it an illumination source (e.g. lighting subassembly
70 with LEDs 74).
[0075] Electrical power to lighting subassembly 70 can be supplied
as follows. Electrical power for shelf 30A could be available by
simply running hardwire harness (one or more individual wires) 76
from board 72 along shelf 30A, or internally between a side edge of
glass plate 40 and its corresponding frame, to at the rear edge of
shelf 30A. As is well-known in the art, a conductive rail or
channel 28 (FIG. 3A) can be formed along one of the pair of
vertical shelf mounting rails 22. Contact 78 at the distal end of
wire harness 76 could be mounted to extend from the rear edge of
shelf 30A so that it would come into abutting contact with a
conductive portion of power rail 28 when shelf 30A is in
appropriate position in compartment 16. An example of such a power
strip is disclosed at U.S. Pat. No. 6,813,896 (commonly owned by
the owner of the present invention) and incorporated by reference
herein. This combination of a hardwired harness from LEDs 74 with
an electrically conductive termination 78, and a vertical power
strip of conductive material along the shelf mounting rails 22,
allows a shelf 30A to be placed in any vertical position along
rails 22 and receive electrical power for LEDs 74. This eliminates
the need for long wires or electrical plugs. However, those are
other options to supply power to LEDs 74.
[0076] As can be seen by the foregoing and FIGS. 1-5, shelf 30A is
an example of an integrated shelf and lighting system which
addresses one or more of the objects of the invention. Its
functions and appearance are illustrated in FIGS. 1-5, including
the photographs of FIGS. 2A-C and 3A-C, which show the lighting
system of each shelf 30A turned on.
Exemplary Embodiment 2
[0077] By referring to FIGS. 6A-B to 9, another exemplary
embodiment according to the invention is shown. This shelf 30B has
similarities to shelf 30A of FIGS. 1-5. By referring to FIG. 6A,
shelf 30B integrates an at least partially light transmissive main
supporting surface with edge framing and protection with a lighting
subassembly. It builds into the framing receivers for shelf
mounting brackets. It provides communication of electrical power to
the lighting subassembly. Some notable differences are as
follows.
[0078] In this embodiment, a thinner glass plate 80 than glass
plate 40 is utilized to present a glass top supporting surface 81
for shelf 30B (see FIG. 6B). One example would be a tempered glass
sheet of on the order of one millimeter thick. Overmolded to it is
framing 90. Framing 90 includes an at least partially light
transmissive planar supporting surface or undersupport 91 (on the
same order of perimeter size as thin glass plate 80 but thicker),
and front, back, left, and right side edge frame portions 93, 94,
95, and 96 that basically encapsulate front, rear, left and right
edges of 83, 84, 85 and 86 of thin glass plate 80. FIGS. 8A and 9
show that encapsulation. Lighting subassembly 70 is either
overmolded in frame 90 adjacent to at least one edge of glass plate
40 or supporting surface 91. As can be seen from FIG. 6A, the
overall assembly 30B (like assembly 30A) presents a substantially
light transmissive glass appearance supporting surface with a
relatively thin framing 90, relatively unobtrusive mounting
brackets 26 that fit into molded forms or receivers in frame 90
(and do not require separate or additional pieces in frame 90), and
a lighting system. The entire assembly 30B gives an integrated,
thin, open appearance, but includes a lighting subassembly, edge
protection, mounting interfaces, and electrical power connection to
power the lighting subassembly, even though shelf 30B can be
removed and repositioned elsewhere along a mounting subsystem (here
vertical rails 22, but it can take other forms).
[0079] Overmolding is well-known in the appliance industry.
Overmolding involves injection molding of one material, usually a
thermoplastic (here frame 90) onto a second material (here thin
glass surface 80). If properly selected, the overmolding
thermoplastic will form at least some bond with the second material
that is maintained in the end use environment. One example of
overmolding is called insert molding. Single shot or multiple shot
injection molding machines can be used. Sometimes there can be
multiple materials shot into the same mold during the same molding
cycle. Some of the factors and design characteristics of
overmolding are set forth in publication entitled "Overmolding
Guide" at
http://www.glstpes.com/pdf/literature/Overmold%20Design%20Guide.pdf,
by GLS Thermoplastic Elastomers and incorporated by reference
herein. Examples of overmolding is described at U.S. Pat. No.
7,748,806 (commonly owned with the owner of the present
application), incorporated by reference herein. Another example of
overmolding, and in particular related to refrigerator shelving can
be found at U.S. 2009/0195136 commonly owned and incorporated by
reference herein.
[0080] In this embodiment, the overmolded thermoplastic of at least
undersupporting surface 91 is a resin material having light pipe or
light guiding properties. An example of utilizing thermoplastic
molded material as a light pipe or guide can be found at U.S.
2011/0085287, owned by Whirlpool Corp., and incorporated by
reference herein. Additional discussion of light guide or pipe
materials can be found at "Light Guide Techniques Using LED Lamps",
application brief I-003, by Avago technologies available at
http://www.avagotech.com/docs/5988-7057EN and incorporated by
reference herein. It is possible that frame 90 could also have
light guide or light pipe characteristics.
[0081] In this example, the overmolded resin material is
polycarbonate (Lexan.RTM.) with 85-91% transmission. Cost,
mechanical performance, moldability, light path design and
transmission desired will affect the resin material selected and
can be considered by the designer.
[0082] FIG. 6B shows diagrammatically and in isolation overmold
frame 90, with its light transmissive undersupport 91 and side
framing portions 93, 94, 95, and 96, and thin glass plate 80
exploded above it. Overmolding would begin with glass plate 80
placed into the mold. Flowable plastic material would then be
injected into the mold and flow under and around the edges of glass
plate 80. It would cool and harden to support the underside of
glass plate 80 and encapsulate and protect the edges of glass plate
80 as illustrated in FIGS. 8A and 9. It would have the integrated
appearance of FIG. 6A.
[0083] As further illustrated in FIGS. 6A-B, 7, 8A-C, and 9, in
this exemplary embodiment the overmolding provides not only an
underlying support surface 91 for thin glass plate 80 across its
entire area but also essentially encapsulates all four of its edges
to protect those potentially fragile edges. The combination
therefore presents an actual glass top supporting surface 81, with
its desirable features, but utilizes only a very thin glass plate
or sheet 80. The overmolded undersupport surface 91 is also light
transmissive; basically transparent or optically clear or
substantially so, if desired. The overmolding process can be
controlled to essentially mold that undersupport 91 to the bottom
of thin glass plate 80 such that there are essentially no gaps or
air bubbles between the two. This promotes the appearance of a
single supporting surface even though it is two layers; one made
from glass plate 80 and the other undersupporting plastic layer 91.
The resin and overmolding process can also be controlled so that
undersupporting layer 91 can have at least similar optical
properties (e.g. transparency) to glass layer 80 to promote the
appearance of a single layer. But it does not have to have the same
optical properties. Either glass plate 80 or underlayer 91 can also
be modified to have other optical properties. One example is adding
a moire pattern, logos, informational text or other optically
altering aesthetic enhancing effects.
[0084] As also indicated in FIG. 7, overmolded frame 90 could be
molded to have receivers (see slots 98 in FIG. 9) for shelf
mounting brackets 26. Receiver 98 could be a recess or form molded
into each opposite side frame portions 95 and 96 into which the top
edge of a shelf mounting bracket 26 would complementarily fit and
prevent movement of shelf 30B at least downwardly and laterally. If
appropriately formed, slots 98 could also prevent fore and aft
movement relative to cabinet 12.
[0085] As further illustrated in FIGS. 6-9, shelf 30B can include a
lighting subassembly 70 similar to that of the first embodiment. In
this example, a linear array of LEDs 74 on a PCB 72 is positioned
along front edge 93 of overmolded frame 90. It is to be understood,
however, that additional arrays could also be positioned along one
or more other edges. They could be linear or other
configurations.
[0086] FIGS. 8A-C illustrate several optional LED mountings. FIG.
8A shows the whole lighting subassembly 70 (PCB 72, LEDs 74, and
wire harness 76) could be overmolded into frame 90. Those
components would be placed into the plastic mold with glass sheet
80 and basically encapsulated into place. Because at least
undersupport 91 of frame 90 is light transmissive, the light output
of LEDs 74 (if their optical axes along plane 97A are directed
along the plane of undersupport 91) would be guided along
undersupport 91 and provide the luminance/illumination along the
whole area of undersupport 91. The light transmissivity of glass
plate 80 would allow persons to see that luminance/illumination. It
would glow like a shelf 30A of FIGS. 2A and 3A. PCB 72 could also
be mounted so that optical axes 97A would extend parallel but
underneath undersupport layer 91 so that the beams from LEDs 74
would project along the bottom of shelf 30B.
[0087] Alternatively, as shown in FIG. 8B, overmolded frame 90
could have a recess 99 under its front edge 93 to which a linear
array of LEDs 74 could be mounted. The optical axes of LEDs 74
could be positioned to direct light from LEDs 74 into a front edge
of undersupport 91 and/or the front edge 83 of glass plate 80 such
that light could be directed through one or both of those layers
along plane 97B.
[0088] Another option is shown at FIG. 8C. LED board 72 could be
angled slightly downward such that the optical axes of one or more
of LEDs 74 is angled downwardly from the front edge 93 of shelf 30B
along plane 97C (or at different angels). All or part of the light
distribution from LEDs 74 could then provide illumination downward.
The beams from LEDs 74 would project downward and illuminate the
space and any structure(s) below shelf 30B. Still further, board 72
and LED 74 could be configured both to provide edge lighting for
either glass surface 80 or undersupport 91 and light distribution
in one or more other directions.
[0089] As illustrated diagrammatically in FIGS. 6A and 6B, an
alternative way of providing electrical power to LEDs 74 is through
inductive, capacitive or magnetic transfer. This is sometimes
called touchless or wireless electrical transfer. A receiving
antenna 116 on shelf 30B can have a terminal end in operative
proximity of radiating antenna 106 behind liner 15. Antenna 116 can
be any of a variety of forms. One example is a thin foil or layer
metal or other electrically conducting material mounted flush to
the top or bottom surface of either undersupport 91 or thin glass
plate 80. The mounting can be by adhesive, thin layer deposition,
printing or otherwise. A similar thin foil or layer trace 117 is in
electrical communication with hard wire harness 76 to each LED 74
on board 72 at solder point (or other electrical connection point)
115. This arrangement does not take up any storage space and is
contained on shelf 30B.
[0090] Radiating antenna 106 is electrically connected to
electrical power source 100 in appliance 10 (e.g. via conducting
section 107 to solder or connection 105 and then wire harness 104)
and master control 102. By methods known in the art, electrical
power from power source 100 can be transferred wirelessly or
touchlessly between antennas 106 and 116 in a manner that can be
utilized to power LEDs 74. An example of such touchless coupling is
described in U.S. Pat. No. 7,293,422, commonly owned by the owner
of the present invention and incorporated by reference herein.
[0091] In this method, by having at least one antenna 106 in
sufficient proximity to all possible positions for shelf 30B,
electrical power would be available for different vertical or
horizontal positions of shelf 30B. Thus, LEDs 74 could be operated
at any time including if shelf 30B were slid outwardly or moved to
a different elevation in cabinet 12. Antenna 106 could be
foamed-in-place when a refrigerator compartment is
thermoformed.
[0092] An additional possible feature includes not only touchless
or wireless transmission of electrical power from power source 100
to LEDs 74 but also transmission in either direction of data or
information in electrical form. Such data or information
transmission is also described in U.S. Pat. No. 7,293,422, which is
incorporated by reference herein. A variety of commercial venders
provide commercial products that allow such shared communication of
both power and instructions or feedback. This will allow master
controller 102 to provide any of a variety of operational
instructions to operation of LEDs 74 or to other functions at
circuit board 72 without having to be hardwired or have touch or
contact through a conducting path.
[0093] One definition of contact or contactless power is
transmission of electrical energy from a power source to an
electrical load without man-made connectors. U.S. Pat. No.
7,293,422 describes inductive or capacitive power transfer and data
exchange in both directions in the context of a refrigerator
appliance. US 2012/0140440 and U.S. Pat. No. 7,522,878,
incorporated by reference herein, describe contactless power and
communication.
[0094] Resonant inductive coupling is one type of wireless or
touchless electronic transmission method. Such power transfer is in
use in a variety of commercially available products. At least the
receiver structure 116/117 on shelf 30B can be of a form factor
that is thin layered. Thus, it could be applied to shelving without
occupying much space. It can also be relatively thin and not
physically or visually disrupt the look of and any light
transmission associated with the shelf. The transmitting part
106/107 could be behind the back or side wall of the supporting
structure for the shelf. For example in the case of a refrigerator,
it could be hardwired to electrical power in an appropriate
transmitting components for wireless power and data transmission
behind the refrigerator liner. It is generally better to have the
two contactless components as close together as possible.
Transmitting components 106 could be placed at various levels
throughout the cabinet supporting shelves and be available for
shelves of multiple different positions or multiple shelves.
[0095] Alternatively, electrical power to LEDs 74 on shelf 30B
could be by other techniques. For example, it could be by any of
the techniques described with respect to embodiment 1, including
through a contact arrangement or hard wiring.
Options and Alternatives
[0096] As can be appreciated by those skilled in the art, the
invention can take many forms and embodiments. Variations obvious
to those skilled in the art will be included within the invention.
Some specific examples are as follows.
[0097] The lighting subassembly 70 could be separately mounted
(screws, bolts, adhesive, or other fastening techniques) to the
overmolded portion 90 or metal frame portion 50 or 60 for shelves
30B and 30A respectively. Alternatively, they could be more
integrated. An example would be to overmold to board 72 in an
overmolded frame such as shown in FIG. 8A. An alternative is
illustrated at FIGS. 10A and 10B. Instead of positioning the
lighting subassembly in the perimeter framing of the overmolding,
one or more lighting subassemblies 70 (here for illustration 70A-D;
but there could be more or less or different configurations than
linear raised) could be mounted at or on the glass plate 80. For
example, by deposition or printing processes known in the art, LED
74 and electrically conductive traces to them could be printed
directly on the underside of thin glass plate 80. Conductive trace
117 could also be printed to that surface and in electrical
communication with some sort of power connection 78' (it could be
contact, contactless, or inductive/magnetic/capacitive connection
to electrical power and/or information transfer). That combination
(thin glass plate 80 plus the LED lighting assemblies) printed on
plate 80 and the electrical traces to power connection (can be low
voltage) can then be placed in an insert mold and the overmolded
framing and undersupport 90 overmolded to that combination. Of
course, the lighting subassemblies could also be positioned in the
mold so that they would end up inside the overmolded undersupport
of overmold framing 90 and electrical connections made to the power
connection. Such lighting assemblies could also be used in
conjunction with those around the perimeter of framing 90. FIG. 10A
shows lighting subassembly 70A-D printed on the underside of thin
glass plate 80 prior to being overmolded with framing 90 separated
for illustration purposes only.
[0098] FIG. 10B shows the cross-section of the glass plate 80 with
printed lighting subassemblies and the overmolded framing,
including the undersupport 91. This provides light sources all
along the optically clear portion of the assembled shelf. It
retains its thin and glass appearance but has lighting available
across that area.
[0099] The types, characteristics, and configuration of the light
sources can vary. For example, it does not have to be necessarily a
linear array, although such does work well with keeping the overall
appearance of either shelf assembly thin. The spacing, number, and
arrangement can vary. As indicated in FIGS. 8A-C, for example, some
part of the overmolding could extend outwardly from glass surface
80 and could be shaped or configured to receive any number of light
sources or configurations. As previously mentioned, a pattern on
the shelf surface could be some sort of pattern that optically
alters light that issues from the shelf surface. One example is a
moire pattern. Other diffusion patterns are known in the art. As it
is further well known in the art, facets or forms can be made in
other patterns in the shelf supporting surface if plastic. Some
patterns can be printed to glass. It is to be understood that any
number of single or multiple patterns are possible at any surface
or along any part of the shelf. Some of the patterns can optically
alter the light distribution. Some could be informational or even
aesthetic. An example would be printing a logo. The printing or
embossment or engravement or other patterning could actually have
both visual and light affecting functions. Still further,
arrangement of the LEDs and/or such optical enhancements can
provide different visual effects. This is akin or analogous to use
of LED lighting arrays in certain configurations alone or with lens
or optical patterns to create brand identity with automobile
taillights or headlights. For example, one or more shelves of each
brand of appliance could have a consistent LED array configuration
and/or optical pattern so that when a consumer views the shelf
there could be identification with a brand or a sub-brand of a
certain company. Optical patterns could be molded into plastic.
They could be silk screened or printed on plastic or glass. There
could be a combination of patterns with the embodiment 30B--one
printed or silk screen on the thin glass 80, another molded into
the undersupport plastic part of the framing.
[0100] Still further, light sources could be distributed along
other edges of the shelf assembly. While the exemplary embodiment
shows them along just the front edge, they could be at any other
side or edge. They could be at two edges, three or all four.
[0101] And, as mentioned, the type and characteristics of the light
sources can be uniform or they could vary. For example, they could
vary as to color, light output distribution, output intensity, or
other characteristics. They could be individual controlled,
controlled together. They could be controlled in subsets.
[0102] Furthermore, the materials related to the supporting
surfaces or parts thereof could affect light guiding or optical
manipulation of the light from the light sources. Reflective
surfaces, lenses, light absorbing surfaces, or other optical
components could be added at the light sources, or other locations
on or near the shelves.
[0103] Circuit board 72 could include some intelligence such as
microprocessor, circuitry, and memory that could help with or add
to the variety of functions related to the light sources or other
features.
[0104] Another possible feature would be to have some sort of
sensor at or near the shelf or in some other location relative the
appliance 10. For example, as illustrated diagrammatically in FIG.
6A, a sensor 108 could be mounted somewhere on or in appliance 10
and in electrical communication with master control 102. It could
be included on circuit board 72. It could feed back information to
master control board 102 via a wiring harness or bus, or contact or
touchless transfer back to master control board 102. An example of
sensor 108 is a switch. It could inform control 102 that a
refrigerator door 14 has been opened. Control 102 could then
communicate an instruction to turn on LEDs 74 of one or more
shelves 30. Another sensor example is a temperature sensor. It
could inform master control board 102 of temperature at or near a
shelf 30. Master control 102 could instruct some sort of indication
correlated to that temperature sensing by LEDs 74 of that shelf 30.
For example, if sensed temperature is above user set point for that
shelf or compartment 16, LEDs 74 could be flashed to alert the
appliance user. Another example would use different colors. If LEDs
of different color output were mounted on a PCB 72 for a shelf 30
(e.g. red, blue and white), control 102 could activate the red LEDs
if temperature set point range is exceeded to indicate to the user
the temperature is too high. Blue could be turned on (and red and
white not turned on) to indicate temperature below a set point
range. White LEDs could be operated if temperature is within set
point range. Another example for sensor 108 would be a proximity or
motion detector. It could detect proximity or motion indicative of
the presence of a person, and controller 102 could turn on LEDs 74
for one or more shelves 30. Once detector 108 ceases to detect such
proximity or motion, controller 102 could turn LEDs 74 off. Such a
detector could be placed at or near a specific shelf 30 and be
calibrated to alert proximity or motion only if at or near that
shelf. In this way a single shelf could be illuminated.
[0105] Alternatively, any number of lighting schemes could be
presented to the user either randomly by master control 102 or
according to user choices. For example, one scheme might be to turn
LEDs 74 on at a highest intensity level when a refrigerator door 14
is first opened (e.g., to help the user see items supported on the
shelf 30). After a certain time period the intensity could drop or
it could slowly ramp down. It could ramp down to a dimmer level or
completely to turn off. Another example would be to run the LEDs at
steady state when a shelf is back in a home position in compartment
16 but if the shelf can be selectively slid out, to flash or
otherwise change output to make the user aware the shelf needs to
be pushed back in before closing door 14. Any of a number of a
variety of lighting schemes is possible.
[0106] Still further, the overmolded version 30B could have just
the overmolded frame portions 93, 94, 95, and 96 and not the
undersupport 91. Or it could just have the undersupport 91 somehow
adhered to the thin glass surface 80. Or combinations of
undersupport in just one edge frame portion, two frame portions,
three or four are possible. Alternatively, brackets 26 could be
inserted in a mold and, in the example of shelf assembly 30B, the
overmolding 90 could be overmolded to the brackets. They would then
be incorporated or integrated into the combination but not
removable therefrom. Brackets could also be fixed to the other part
of the shelf. For example, with embodiment 30A, by adhesive,
screws, or other techniques, brackets 26 could be fixed in place.
This could be true similarly of embodiment 30B. But in some
examples, the overmolding or the framing could have forms in the
perimeter framing that would receive complimentary shapes in
brackets 26 to support the shelf on the brackets in a stable
manner.
[0107] As with Exemplary Embodiment 1, left and right side frame
portions 95 and 96 could be molded to have a slot that is
complementary to mounting bracket 26 such that shelf 30B can simply
be set down onto a pair of brackets 26 and held in place against
lateral, forward, or downward further movement.
[0108] Additionally, the antennas 106 and 116 possible for
touchless power/data transfer can be thin film or applied to the
top or bottom side of undersupport 91 or glass plate 80 and not
take up any space. They could be applied on the outside or inside
of the overmolded frame portions. Or they could be a separate
piece. As has been mentioned, electrically conductive leads could
be printed onto either a glass surface or plastic surface to
decrease materials cost, maintain thinness and good clean
appearance and the like.
[0109] As can be appreciated, in many structures, particularly
appliances that have functions in addition to illumination, an
intelligent control exists. In the example of a refrigerator
appliance, many current such appliances have such an intelligent
controller or master control. It can manage electrical power to
other functional components (e.g. cooling subsystem, ice making
subsystem, dispenser subsystem, user selectable interfaces, etc.).
In the context of the exemplary embodiments, such a master control
could be programmed or could take user input and translate that
into lighting effects for the light subassemblies at each shelf.
Examples of such a master control or intelligent control are
described at U.S. Pat. No. 7,765,819, U.S. Pat. No. 7,891,198, and
US 2009/0277210, all incorporated by reference herein. For example,
the intelligent control could be programmed to activate lights at
the shelf on any of a number of triggers or states relative the
appliance. One example would be to turn the lights on for a shelf
when an intelligent control senses the door in front of the shelf
has been opened. Another example would be to automatically turn on
the lights when the door is opened but turn them off if the shelf
is moved (e.g. slid forward) a given distance. Another would be to
keep the lights off at a shelf unless a touch sensor or other user
activated switch is touched or a proximity sensor senses a user's
hand within range of the sensor.
[0110] The ability of the master control or intelligent control to
monitor different sensed conditions, states of the appliance, or
user inputs, as well known. The incorporated by reference U.S. Pat.
Nos. 7,768,189, 7,891,198, and US 2009/0277210 provide examples of
different sensed conditions, states of the appliance, or user
inputs that could be monitored and utilized in the effecting a
lighting effect with the light subsystem at one or more shelves.
Examples could include sensing temperature at or near the shelf and
illuminating a certain color output of LED out of plural different
colors on the shelf. An example would be if the shelf is intended
for storing fresh food items and the temperature around it is
within range of a default range or a user selectable range. The
lights could be blue to indicate within range temperature. However,
if the temperature sensors sense temperature above the range, red
LEDs could be illuminated and the blue LEDs turned off. A third
color such as white could indicate some other condition. Another
example would be sensors on, at, or near a shelf 30 when it is in
operative position in an appliance (see, e.g. FIG. 6B). The sensor
could feed back information to an appliance controller that could
inform or influence a lighting affect at shelf 30. An example would
be a temperature sensor at or near the top supporting surface of
shelf 30. If temperature at that location in a refrigerated
appliance exceeds some sort of set point, red LEDs could be turned
on by the controller to indicate to the appliance user the
temperature has gone above set point. If below set point, LEDs
could be turned on to indicate normal condition but illuminate the
shelf. On the other hand, if temperature goes below a set point,
blue LEDs could be turned on.
[0111] Another example would relate perhaps more to a bin or
drawer. Some bins or drawers can actually have heater elements. An
example would be a thawing drawer. Frozen food could be placed in
the thawing drawer and a temperature regiment applied to promote
safe but quick thawing. LEDs in the drawer could be controlled by
feedback from a temperature sensor sensing temperature in the
drawer to inform the user that the food is not yet thawed (e.g.,
blue lights). Then when it is sensed that the food is thawed, red
LEDs could be turned on. Another example could be a sensor that
senses some characteristic of food to inform a lighting affect. An
example would be a chemical sensor that could sense if food is
spoiling or rotting. It could then feed that information to the
controller which could turn on red LEDs or some other color to
alert the user. Instead of color, flashing or other variable
driving of the LEDs could be implemented. A designer could utilize
any of a variety of feedback information and any of a variety of
lighting effects. A benefit of that combination is that each shelf
or drawer or bin has its own control and communication of
information to the user. Each shelf or drawer or the like at least
appears to be "smart" in this context.
[0112] Still further, an intelligent control could be programmed to
provide different lighting effects from any lighting subassembly on
a shelf. One example would be to flash if the user's hand comes in
proximity to the shelf, if the shelf is slid forward and needs to
be slid back to home position before door could be closed, or if
temperature sensed around it is out of range. Another example would
simply be to ramp up the intensity of the lights based on time or
some other factor.
[0113] As can be appreciated, the driving of the LEDs based on some
sensed condition or trigger could take any number of forms. The
designer could select the same based on some desired indication to
the user that conveys some information relative to the shelf, what
is on the shelf, or the area around the shelf. It could also be for
aesthetic purposes.
[0114] It is to be understood that the invention could take a wide
variety of forms and configurations. Variations obvious to those
skilled in the art will be included within the invention.
[0115] Different features of the different exemplary embodiments
can be utilized in still further embodiments. For example, the two
piece framing of exemplary embodiment one could be substituted by
the overmolded framing of exemplary embodiment two. Or the two
layer middle supporting plates of exemplary embodiment two could be
a single plate of glass or plastic more robust than the thin top
glass plate of embodiment two.
* * * * *
References