U.S. patent number 3,859,932 [Application Number 05/394,925] was granted by the patent office on 1975-01-14 for adjustable shelf assembly.
This patent grant is currently assigned to General Electric Company. Invention is credited to William J. Armstrong, Donald G. McDowell, Jr..
United States Patent |
3,859,932 |
Armstrong , et al. |
January 14, 1975 |
ADJUSTABLE SHELF ASSEMBLY
Abstract
An adjustable shelf assembly as for use in a refrigerator
storage compartment having a series of vertically spaced shelves,
wherein the adjustable shelf assembly has a fixed rear shelf half
and a movable front shelf half that is movable between a first
raised position that is generally flush with the fixed shelf and a
second lowered position wherein the movable shelf is stored closely
beneath the rear shelf for accommodating tall or bulky food items
supported on a shelf located immediately beneath the first raised
position of the movable shelf.
Inventors: |
Armstrong; William J.
(Jeffersontown, KY), McDowell, Jr.; Donald G. (New Albany,
IN) |
Assignee: |
General Electric Company
(Louisville, KY)
|
Family
ID: |
23560961 |
Appl.
No.: |
05/394,925 |
Filed: |
September 6, 1973 |
Current U.S.
Class: |
108/75; 108/143;
108/138; 312/246 |
Current CPC
Class: |
F25D
25/02 (20130101); A47B 96/025 (20130101); F25D
2325/022 (20130101); F25D 2331/803 (20130101); F25D
2325/021 (20130101); F25D 2325/023 (20130101) |
Current International
Class: |
A47B
96/02 (20060101); F25D 25/02 (20060101); A47b
011/00 () |
Field of
Search: |
;108/143,144,75,73,138
;312/246 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,119,009 |
|
Mar 1956 |
|
FR |
|
866,225 |
|
Apr 1961 |
|
GB |
|
Primary Examiner: Zugel; Francis K.
Claims
We claim:
1. An adjustable shelf assembly comprising a pair of parallel side
frames adapted to be supported in cantilever fashion from a
vertical wall at the rear of the shelf assembly, a rigid shelf
portion attached between the side frames at the rear portion of the
side frames, and a movable shelf portion adapted to be supported
from the side frames, and slidable means joining the movable shelf
to the side frames so that the movable shelf is movable between a
first raised position at the front of the shelf assembly so that
its top surface is generally in the same horizontal plane as the
top surface of the rigid shelf and a second lowered position when
the movable shelf generally underlies the rigid shelf, said
slidable means comprising elongated slot means in the two side
frames and low friction bearing means supported on the sides of the
movable shelf, said elongated slot means comprising a front slot
and a rear slot in each side frame, the said bearing means
comprising a front bearing member operating in each front slot and
a rear bearing member operating in each rear slot, each rear slot
having an upwardly inclined section just in front of the front edge
of the rigid shelf as well as a short horizontal section at the top
portion of the inclined section, each front slot having a taller
upwardly inclined section adjacent the front portion of the side
frame as well as a longer horizontal section at the top portion of
the said last-mentioned inclined section, the front-most portion of
the said longer horizontal section comprising a downwardly and
rearwardly directed section to serve as an automatic locking means,
whereby when the front bearing members of the movable shelf are
lowered into the said downwardly directed section the movable shelf
tends to shift slightly toward the rigid shelf and substantially
close the gap between the movable shelf and the rigid shelf and
form a single horizontal continuous shelf.
2. An adjustable shelf assembly as recited in claim 1 wherein the
front bearing members of the movable shelf must be raised out of
the downwardly and rearwardly directed section by a forwardly and
upwardly directed force so as to tilt the movable shelf at an angle
so that it is able to clear the rigid shelf and may be lowered
beneath the rigid shelf.
Description
BACKGROUND OF THE INVENTION
In a storage cabinet there is often the problem of accommodating at
certain isolated times large or bulky items. This frequently
happens in a household refrigerator cabinet where the food items
tend to be of a large variety of sizes and shapes, especially for
large households or during the preparations for large dinner
parties. One solution is to have vertically adjustable shelves for
changing the vertical spacing between shelves to accommodate tall
or bulky food items, but this usually requires first emptying the
shelf to be moved.
The principal object of the present invention is to provide an
adjustable shelf assembly which permits the front to back dimension
of the shelf assembly to be foreshortened to about one half of its
original depth by sliding a front movable shelf beneath a rear
fixed shelf.
A further object of the present invention is to provide an
adjustable shelf assembly of the class described with a slidable
means for the shelf in the form of cooperating bearing members and
elongated slot means for ease in moving the movable shelf
independently of the rigid shelf.
A still further object of the present invention is to provide an
adjustable shelf assembly of the class described wherein the
movable shelf is provided with releasable locking means to prevent
the movable shelf from being inadvertently shifted to its stored
position while food items might be supported thereon and might
otherwise be swept off the movable shelf and fall into a heap of
disarray.
SUMMARY OF THE INVENTION
The present invention, in accordance with one form thereof, relates
to an adjustable shelf assembly comprising a pair of parallel side
frames and a rigid shelf attached to the side frames toward the
rear of the shelf assembly and a movable shelf supported from the
side frames. A slidable means joins the movable shelf to the side
frames so that the movable shelf is movable between a first raised
position at the front of the shelf assembly where the movable shelf
is generally level with the fixed shelf and a second lowered
position where the movable shelf may be stored beneath the fixed
shelf. The slidable means comprises elongated slot means in the
side frames and bearing means carried by the movable shelf and
supported in the slot means so that the movable shelf may be moved
independently of the fixed shelf. The slidable means includes
releasable locking means for holding the movable shelf in its front
raised position so that it may not be inadvertently shifted to its
stored position.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will be better understood from the following
description taken in conjunction with the accompanying drawings and
its scope will be pointed out in the appended claims.
FIG. 1 is a front perspective view of a combination two-door
refrigerator-freezer with the lower door broken away to show
several vertically spaced refrigerator cabinet shelves, where the
middle shelf is an adjustable shelf assembly embodying the present
invention.
FIG. 2 is a transverse, cross-section plan view of a refrigerator
cabinet having an adjustable shelf assembly embodying the present
invention taken generally on the line 2--2 of FIG. 1, where the
view is turned on its side and broken in the middle so that the
opposite side walls of the refrigerator cabinet could be brought
closer together so as to reduce the overall size of FIG. 2. This
FIG. 2 is actually a double view. The lower half of this FIG. 2
shows the movable shelf in its front raised position, while the
upper half of this FIG. 2 shows the movable shelf in its second
lowered position wherein it is stored closely beneath the fixed
shelf at the rear of the refrigerator compartment.
FIG. 3 is a fragmentary, cross-sectional elevational view of the
adjustable shelf assembly of the present invention taken on the
line 3--3 of FIG. 2.
FIG. 4 is a fragmentary, cross-sectional elevational view similar
to that of FIG. 3 showing the movable shelf in an intermediate
position after a pulling force is exerted on the front edge of the
movable shelf, and showing the function of the elevating means of
the elongated slot means in the side frames of the adjustable shelf
assembly.
FIG. 5 is a fragmentary, cross-sectional elevational view similar
to that of FIG. 4 showing the movable shelf in its first raised
position, wherein the front bearing members of the movable shelf
are seated within a locking detent in the front edge of the front
slot.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Turning now to a consideration of the drawings and in particular to
FIG. 1 there is shown for illustrative purposes a two-door
refrigerator-freezer 10, where a freezer 14 is shown mounted at the
top of the appliance. The present invention relates to a storage
cabinet 12 having an adjustable shelf assembly that would be used
in conjunction with a series of vertically spaced shelves, where it
is desirable at limited times to be able to accommodate tall or
bulky items with the least amount of preparation or manipulation by
reducing the depth of the front to back dimension of the adjustable
shelf assembly so that tall or bulky items may be supported on the
shelf immediately beneath the adjustable shelf assembly. While the
present invention will be described with relation to a refrigerator
cabinet it will be understood by those skilled in this art that
this invention is usable in other combinations or environments
where there is a series of vertically spaced shelves for compact
storage purposes.
For the sake of simplicity, the refrigerator door in FIG. 1 is
shown broken away for viewing into the refrigerator compartment and
identifying a fixed lower shelf 16, an adjustable shelf assembly 18
of the present invention overlying the fixed shelf 16, and a third
upper shelf 20 which is also fixed within the compartment.
Turning to a consideration of the fragmentary cross-sectional plan
view of FIG. 2 which is taken on the line 2--2 of FIG. 1 and
illustrates the adjustable shelf assembly of the present invention,
it should be recognized that this FIGURE is broken in the middle to
highlight the details of the side walls of the refrigerator
compartment. The topmost half of FIG. 2 shows a movable front shelf
pushed back into the refrigerator compartment to underlie a fixed
rear shelf. Similarly the bottom half of FIG. 2 shows the movable
front shelf in its front supporting position that is generally in
the same plane as the fixed rear shelf.
This refrigerator cabinet 12 comprises a box-like inner liner 24
that is surrounded by a thermal insulating layer 26 which is in
turn enclosed by an outer cabinet structure 28. This FIG. 2 is
turned on its side from the front perspective view of FIG. 1. This
view has been broken in the middle in order to simplify the
illustration of the invention. A front door frame 30 is shown at
the right side of FIG. 2, and it is provided with suitable
resilient door gaskets 32 for cooperation with the refrigerator
door (not shown) so as to retain the cold air within the
refrigerator compartment 22.
The adjustable shelf assembly 18 of the present invention may be
best understood with relation to FIGS. 2 and 3 of the drawings.
This adjustable shelf assembly 18 comprises a pair of parallel side
frames 36 and 36' and a fixed rear shelf 38 that is attached to the
side frames at the rear of the shelf assembly, and a movable shelf
40 which is slidably mounted from the side frames to be movable
between a first raised position adjacent the front of the storage
compartment 22 and a second lowered position that is stored closely
beneath the fixed shelf 38 as is seen at the top half of FIG.
2.
The fixed rear shelf 38 is of open welded wire configuration having
a front transverse rail 44 and a rear transverse rail 46 which are
joined together by a series of front to back parallel wire forms
48. The opposite ends of the front and the rear rails 44 and 46 are
permanently attached to the side frames 36 and 36'. This joins the
rear shelf 38 and the side frames 36 and 36' into an integral
assembly. These side frames are sheet metal stampings such as
lightweight aluminum. They are cantilever shelf support members
that are provided with attachment tabs 50 and 52 as seen in FIG. 3
along the rear edge of each for engagement in vertically spaced
slots in a vertical rail 54 as seen in FIG. 2 in order to provide
the capability of a vertically adjustable shelf. This feature of
vertically adjustable shelves is quite prevalent in the
refrigerator art so that no special tools are needed in order to
disconnect the shelf from its support or to reassemble the shelf in
a different position. The vertical rails 54 are provided with a
plurality of vertical slots 53 for accommodating the attachment
tabs 50 and 52 of the side frames in many different elevations.
The movable front shelf 40 has a general welded wire construction
similar to that of the fixed shelf 38 in that it has a front
transverse rail 56 and a rear transverse rail 58 that are joined by
a plurality of parallel wire forms 59. However, the opposite ends
of the front and rear rails 56 and 58 are not permanently attached
to the side frames 36 and 36'. Instead, the opposite ends of the
rails 56 and 58 are provided with bearing members 56' and 58'
respectively. These bearing members cooperate with a pair of
elongated slots 60 and 62 which are formed in each side frame 36
and 36'. Slot 60 is the frontmost slot and it cooperates with the
front bearing 56', while the slot 62 is the rearmost slot and it
cooperates with the rear bearing 58'. The side frames 36 and 36'
have the same slot means 60 and 62 formed therein. Therefore, they
are not both illustrated, since they are substantial mirror images
of each other.
Each bearing member 56' or 58' is a low friction member such as a
nylon or similar plastic part which is assembled on the ends of the
transverse rails 56 and 58 of the movable shelf 40. Each bearing
member has a cylindrical tread portion 66 which slides within slot
60 or 62, and an outer circular flange portion 68 which is pressed
against the outer side of each side frame 36 or 36' and serves as a
locking and guiding means for the movable shelf 40.
FIG. 5 shows the normal use position of the adjustable shelf
assembly 18, where the movable shelf 40 is in its first raised
position that is generally level with the fixed rear shelf 38.
FIG. 3 is a view similar to that of FIG. 5 except the movable shelf
40 has been shifted by a simple one hand operation into its second
lowered position where it is stored closely beneath the rear fixed
shelf 38. Thus, it is possible to place tall or bulky items on the
lower shelf 16 such as a tall ginger ale bottle 70 which extends
above the adjustable shelf assembly 18. Thus the movable shelf 40
must be provided with slidable means joining the movable shelf to
the side frames 36 and 36'. This slidable means includes the two
pairs of bearing members 56' and 58' and the two pairs of elongated
slots 60 and 62. Each elongated slot 60 and 62 is provided with an
elevating means adjacent the front portion thereof. Hence, when a
pulling force is exerted on the front rail 56 of the movable shelf
40, the movable shelf will first move out from beneath the fixed
shelf 38 and then rise slightly until it assumes an elevated
position generally flush with the fixed rear shelf 38. As seen in
FIG. 3, this elevating means comprises an inclined slot section 72
at the front of the front slot 60, and an inclined section 74 at
the front of the rear slot 62. As is best seen in FIG. 4, the front
inclined slot 72 is traversed by the bearing member 56' before the
rear bearing member 58' reaches the rear inclined section 74.
Further forward movement of the movable shelf 40 from the position
shown in FIG. 4 causes the front bearing members 56' to pass over a
horizontal slot section 76, while at the same time the rear bearing
member 58' moves up the rear inclined section 74. This rear slot 62
also has a horizontal slot section 78 forwardly of the inclined
slot section 74.
It is well to provide the movable shelf 40 with a releasable
locking means when the movable shelf is in its first raised
position so that the movable shelf may not be inadvertently shifted
rearwardly when items are resting on the movable shelf. If this
were to occur such items might be wiped off the movable shelf by
the front rail 44 of the fixed shelf 38 as the movable shelf were
suddenly shifted to its stored position of FIG. 3.
This releasable locking means is shown in the front slot 60 as a
vertical detent 79 forwardly of the horizontal slot section 76 such
that the bearing member 56' will naturally fall into the detent.
This detent 78 is curved downwardly and rearwardly such that when
the front bearing 56' comes to rest at the bottom of the detent it
underlies an overhead ledge 80, as is best seen in FIG. 5. The
function of this curved detent section 78 is to cause the front
bearing member 56' to ride beneath the overhead ledge portion 80
such that it is difficult to inadvertently shift the movable shelf
40 to its stored position by accidently striking against the front
edge of the movable shelf. Thus, in order to unlock the movable
shelf it is first necessary to give a slight pulling force on the
front of the movable shelf 40 and then to lift the bearing members
56' out of the detent 78, and then to push rearwardly causing the
bearing members 56' to slide along the horizontal section 76 at
which time the rear bearing members 58' tend to slide across the
horizontal section 78 and down the inclined slot section 74 at
which time the front bearing members 56' will reach the inclined
section 72 and start to drop causing the rear of the movable shelf
40 to slide beneath the fixed shelf 38.
It should be noted that the horizontal section 76 of the front slot
60 is slightly above the horizontal section 78 of the rear slot 62
such that when the front bearing members 56' slide into the
vertical detent 78 and come to rest in the position shown in FIG. 5
the top surface of the movable shelf is generally flush with the
top surface of the fixed shelf 38, so that it is easy to slide food
items back and forth between the movable shelf 40 and the fixed
shelf 38.
While the shelf assembly 18 is shown as being made of welded wire
construction, it should be understood that other shelf materials
could be substituted without departing from this invention. The
shelf could also be made of solid glass or plastic that may be held
in a suitable metal frame.
Modifications of this invention will occur to those skilled in this
art. Therefore, it is to be understood that this invention is not
limited to the particular embodiments disclosed but that it is
intended to cover all modifications which are within the true
spirit and scope of this invention as claimed.
* * * * *