U.S. patent number 3,628,845 [Application Number 05/036,283] was granted by the patent office on 1971-12-21 for refrigerator cabinet with self-closing door.
This patent grant is currently assigned to General Electric Company. Invention is credited to Bernard J. Grimm.
United States Patent |
3,628,845 |
Grimm |
December 21, 1971 |
REFRIGERATOR CABINET WITH SELF-CLOSING DOOR
Abstract
A refrigerator cabinet having an access opening and a door for
closing the access opening is provided with a hinge construction
assuring the self closing of the door from a substantially open
position and the positive sealing of the door gasket with the
cabinet base as the door approaches its closed position. In
accordance with the preferred embodiment of the invention, the
hinge construction also includes means for positioning the door in
a predetermined open position as for example at an angle of
90.degree. with the face of the cabinet.
Inventors: |
Grimm; Bernard J. (Louisville,
KY) |
Assignee: |
General Electric Company
(N/A)
|
Family
ID: |
21887719 |
Appl.
No.: |
05/036,283 |
Filed: |
May 11, 1970 |
Current U.S.
Class: |
312/309; 16/312;
312/321.5 |
Current CPC
Class: |
E05F
1/063 (20130101); E05Y 2900/31 (20130101); Y10T
16/5398 (20150115) |
Current International
Class: |
E05F
1/06 (20060101); E05F 1/00 (20060101); E05f
001/02 () |
Field of
Search: |
;312/138,138A,213,214,319 ;16/153,160,154,152 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: McCall; James T.
Claims
What I claim as new and desire to secure by Letters Patent of the
United States is:
1. In combination, a refrigerator cabinet having an access opening
in the front wall thereof, a door for closing said access opening
and having thereon a gasket for engaging the front wall of said
cabinet when the door is closed to seal said opening, and upper and
lower hinge means respectively mounted on said cabinet above and
below said door for pivotally supporting said door on said
cabinet;
the axis of said upper hinge means being offset rearwardly from the
axis of said lower hinge means;
said lower hinge means comprising a fixed bearing and a plate
member;
said fixed bearing member surrounding the axis of said lower hinge
means and including a plurality of spaced radially extending slots
in the upper surface thereof, said slots having inclined
sidewalls;
said plate member being secured to the bottom edge of said door and
movable with said door and including a portion surrounding said
lower hinge axis and having at least two spaced radially extending
projections thereon for engagement with two of said slots when said
door is in a closed position;
said projections including flat bottom surfaces adapted to ride on
flat areas on said lower bearing member during pivotal movement of
said door.
Description
BACKGROUND OF THE INVENTION
It is of course well known that in order to maintain the desired
food preservation food temperatures in a refrigerator, the door or
doors closing an access opening or openings to the refrigerator
should be closed and sealed. To this end it is desirable to provide
means for automatically closing an open refrigerator door. However
such means should not interfere with the normal usage of the
refrigerator. More specifically, the closing action or movement
should be relatively slow giving the user ample time in which to
transfer articles to or from the storage refrigerated compartment.
Also the closing force should be low so that contact of the moving
door with the user's arm does not cause the user to drop an article
being placed into or removed from the refrigerator.
For many years a simple and cost-free means for obtaining a slow
and gentle closing of the opened refrigerator door has consisted of
tilting the entire cabinet a few degrees rearwardly whereby the
door when opened less than 90.degree. will move toward its closed
position by gravitational forces. Such gravitational closing of a
door has also been obtained by offsetting the upper hinge axis
slightly rearwardly, that is in the direction of the face of the
cabinet from the lower hinge axis; this in effect resulting in a
rearward tilting of the hinge axis so that a door opened less than
90.degree. is gravity biased towards a closed position.
However, a combination of resisting forces frequently causes such a
door to stop short of its completely closed position. These forces
include the forces required to compress the gasket and the "piston"
force resulting from a compression of the air contained within the
cabinet as the door approaches its closed position. Thus the door
may remain slightly ajar not enough to be noticed but sufficient to
cause a loss of refrigerating temperatures.
SUMMARY OF THE INVENTION
The present invention is directed to a refrigerator cabinet
including a hinge construction designed to assure the complete
self-closing of the refrigerator door.
In accordance with the illustrated embodiment of the invention,
there is provided a refrigerator cabinet having an access opening
at the front thereof and a door for closing the access opening, the
door carrying a gasket adapted to seal against the face of the
cabinet surrounding the access opening. The door is supported for
swinging movement on the cabinet by a hinge structure including
upper and lower pivot hinges at least one of which, usually the
lower hinge, provides the principle vertical support for the door.
The axis of the upper hinge is offset towards the face of the
cabinet from the axis of the lower hinge thereby in effect
providing a tilted pivot axis for the door which is sufficient to
cause the door to slowly move towards a closed position from any
point short of a 90.degree. door opening. The load-supporting hinge
comprises a bearing member rigidly secured to the cabinet and
surrounding the hinge pin and this member includes a plurality of
spaced radially extending slots in the upper surface thereof. A
plate member secured to the door and moveable therewith has a
passage therein for receiving the hinge pin and also includes at
least one projection thereon for engagement with one of the slots
when the door is in a closed position. The slots are provided with
inclined or sloping radial sidewalls adapted when a projection
drops into a slot to provide a wedging action or force, the
horizontal component of which urges the door towards its closed
position.
In accordance with the preferred embodiment of the present
invention, the load-supporting hinge also includes a slot or
opposed slots adapted to receive one or more projections and
thereby position the door in a predetermined partially opened
position, as for example, at an angle of 90.degree. with reference
to the face of the cabinet.
BRIEF DESCRIPTION OF THE DRAWING
In the accompanying drawing:
FIG. 1 is a front elevational view of a refrigerator incorporating
the hinge structure of the present invention;
FIG. 2 is an enlarged fragmentary side view of a portion of the
refrigerator of FIG. 1;
FIG. 3 is an enlarged, exploded, perspective view of the lower,
vertical load-supporting hinge component of the present
invention;
FIG. 4 is an enlarged fragmentary view showing the relative
positions of certain elements of the lower hinge when the door is
closed; and
FIG. 5 is a view similar to FIG. 4 showing the relative positions
of these elements when the door is partially open.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the accompanying drawing, there is illustrated in
FIGS. 1 and 2 thereof a single door refrigerator including a
cabinet 1 containing a storage compartment 2 having an access
opening at the front thereof closed by a door 3, the door carrying
a sealing gasket 4 adapted to engage the front face 5 of the
cabinet surrounding the access opening. The door 3 is mounted on
the face of the cabinet 1 by means of an upper hinge 6 and a lower
hinge 7 of the type which permits the door to pivot about an axis
extending through the door so that as the door is moved to its open
position it will not extend beyond the hinge side of the
cabinet.
More specifically the upper hinge 6 comprises a bracket 8 secured
to the top surface of the cabinet by means of one or more screws 9,
the bracket 8 extending forwardly or beyond the face 5 of the
cabinet and above the top edge 10 of the door 3. A hinge pin 11
secured to the bracket 8 extends downwardly through the top edge of
the door and into a thimble 14 in the upper edge of the door 2.
Similar components of the lower hinge 7, which is the vertical
load-supporting hinge, are a hinge bracket 16 suitably secured to
the face of the cabinet below the lower edge 17 of the door and
including a horizontal arm 18 extending forwardly below the door 3
and supporting a hinge pin 19 extending upwardly through the lower
edge of the door and into a thimble 20.
As is shown in FIG. 2 of the drawing, the upper hinge pin 11 is
offset rearwardly from the lower hinge pin 19 or in other words is
closer to the face of the door than is the lower hinge pin 19. This
offset slats the hinge axis of the door a few degrees inwardly
towards the face of the cabinet and this inclination of the pivot
axis of the two hinge pins gravity biases the door for movement
towards its closed position from any open position of less than
90.degree. with reference to the face of the cabinet.
The gravitational forces resulting from the offset hinge axis
causes the door to move freely towards its closed position up to
the point where the gasket 4 initially contacts the face of the
cabinet 5. At this point closing movement of the door is opposed by
initial contact of the hinge side of the gasket with the cabinet,
the resistance of the gasket to compression and the piston effect
of the door compressing the atmosphere within the refrigerator
compartment. These opposing forces can cause the door to be stopped
short of the complete gasket-sealing position. The piston effect is
partly due to the fact that the inner panel or surface 21 of the
usual refrigerator door, as shown in FIG. 2, extends some distance
into the access opening and in overlapping relationship with the
usual breaker strip 22 defining this access opening so that as soon
as this part of the door enters and substantially fills the opening
before the door is closed, it compresses the air within the
compartment 2.
In order to assure a final or complete closing of the door, the
lower or load supporting hinge structure 7 is designed to provide
an additional closing force operative when the door approaches the
closed position.
The means for accomplishing this result comprises a lower fixed
bearing member 24 and an upper movable bearing member 25 rigidly
secured to the door 3. The illustrated facing surfaces of these two
bearing members are designed to assure full closing of the door, to
position the door in a substantial 90.degree. open position and to
provide the load supporting or bearing surfaces required to permit
swinging of the door between its open and closed positions.
The lower bearing member 24 is an annular member surrounding the
lower hinge pin 19. It is rigidly secured to the bracket arm 18 by
any suitable means as for example by brazing it to the arm 18. Its
upper or bearing surface is formed to include four equally spaced
and radially extending slots 26 having sloping or inclined radial
sidewalls 27, the slots 26 being separated from one another by
pie-shaped flat areas 28.
The upper bearing member 25 has an opening 30 therein for receiving
the hinge pin 19 and has an opening 31 therein for receiving a
screw 32 for attaching the upper bearing member 25 to the lower
edge of the door. Its annular bearing surface includes a plurality
of outwardly extending projections 33 having inclined sidewalls 34.
These projections are adapted to mate or match with the recesses 26
when the door is in either its closed or 90.degree. position. The
projections 33 also include flat lower end surfaces 35 of about the
same shape and configuration as the flat surfaces 28 on the lower
bearing member in order to provide maximum bearing area for
supporting the weight of the door as it is moved to its open or
closed positions. In the illustrated embodiment of the invention,
four projections 33 are provided on the upper bearing member 25 in
order to provide the maximum possible surface areas 35.
The purpose of the slanting sidewalls on the projections 19 and the
mating slots 26 is to provide the additional force required to
assure full gravitational closing of the door. To this end, two
diametrically opposed slots and cooperating projections should be
employed for closing the door. Further, in order to provide for a
positioning of the door at a 90.degree. opening point, four such
slots and at least two projections are required.
In other words, the lower bearing member 24 and the upper bearing
member 25 are so oriented that when the door is approaching its
closed position, projections on the upper bearing member 25 will
have rotated relative to the lower bearing member 24 to a position
such that they drop into mating slots. The inclined sidewalls 27 of
the slots and projections then provide a camming action, camming or
biasing the door to its closed position.
When the door is opened, the inclined sidewalls permit the
projections 33 to ride upwardly out of their mating slots. During
the time that the projections 33 are between adjacent slots, the
lower flat surfaces 35 are sliding over the flat bearing surfaces
28 as illustrated in FIG. 4 of the drawings. Upon a substantially
90.degree. degree opening of the door, the resultant 90.degree.
relative rotation between the upper and lower bearing members
causes the respective projections to drop into the next adjacent
slots thereby positioning the door at about a 90.degree. open
position.
Preferably, and in order to more positively assure the closing and
sealing of the door, the upper and lower bearing members are
positioned so that when the door is completely closed, projections
19 will still be riding downwardly along the inclined sidewalls 27
of slot 26 as shown in FIG. 5 of the drawing. In other words,
instead of aligning the upper and lower bearing members relative to
the door and the face of the cabinet so that when the door is in
its closed position, the projections are completely seated in their
respective slots, these components are oriented so that complete
seating would be obtained only if the door could move another few
degrees, as for example, another 5.degree.. This assures that a
positive closing force is provided by the bearing members 24 and 25
even after the door is fully closed.
It will be obvious, of course, that be making varied combinations
of bearing member slots and projections, the door may be located at
different open positions. For example, three projections and three
slots equally spaced will provide for positioning the door in a
120.degree. open position. In general, not more than four slots and
cooperating projections should be used as additional slots decrease
the effective load-supporting bearing areas as represented by the
flats 28 and the lower bearing member and the flat ends 35 on the
upper bearing member.
While there has been shown the specific embodiment of the present
invention, it is to be understood that it is not limited thereto
and is intended by the appended claims to cover all such
modifications as followed in the scope of the invention.
* * * * *