U.S. patent number 3,612,821 [Application Number 05/089,880] was granted by the patent office on 1971-10-12 for door frame construction.
This patent grant is currently assigned to Anthony's Manufacturing Company, Inc.. Invention is credited to Michael E. Stromquist.
United States Patent |
3,612,821 |
Stromquist |
October 12, 1971 |
DOOR FRAME CONSTRUCTION
Abstract
A door mounting frame structure for a refrigerated cabinet. Each
elongated frame member has a longitudinal groove for receipt of a
heater wire. A cover plate covers the heater wire groove and
provides a surface for contact with a door-mounted gasket. One
longitudinal edge of the cover plate is held in place by a
longitudinal cover-plate-receiving groove formed in the frame
member. The other longitudinal cover plate edge is secured by the
covering head of a retainer strip. The strip has a foot portion
adapted to be removably inserted in a longitudinal groove formed in
the frame member.
Inventors: |
Stromquist; Michael E. (Studio
City, CA) |
Assignee: |
Anthony's Manufacturing Company,
Inc. (San Fernando, CA)
|
Family
ID: |
22220047 |
Appl.
No.: |
05/089,880 |
Filed: |
November 16, 1970 |
Current U.S.
Class: |
219/218; 49/70;
62/248; 219/214 |
Current CPC
Class: |
F25D
21/04 (20130101); E06B 1/16 (20130101); F25D
23/02 (20130101) |
Current International
Class: |
F25D
21/00 (20060101); F25D 21/04 (20060101); F25D
23/02 (20060101); E06B 1/12 (20060101); E06B
1/16 (20060101); H05b 001/00 () |
Field of
Search: |
;219/213,214,218
;62/248,275 ;312/236 ;49/70 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Truhe; J. V.
Assistant Examiner: Albritton; C. L.
Claims
I claim:
1. In a refrigerator door mounting frame, the frame structure
comprising:
an elongated frame member defining a face, said frame member having
first and second longitudinal end portions;
a longitudinal cover-plate-retaining slot formed adjacent the first
end portion;
at least one longitudinal heater-element-receiving groove formed in
the face intermediate the end portions and adapted to have a
heating element inserted therein;
a longitudinal retainer-strip-receiving groove formed in the face
further removed from the first end portion than is the
heater-element-receiving groove;
an elongated cover plate having one longitudinal end portion
disposed in the cover-plate-retaining slot and another, opposite,
longitudinal end portion positioned adjacent the
retainer-strip-receiving groove; and
an elongated retainer strip having a foot portion releasably
insertable in holding relation into the retainer-strip-receiving
groove; and a head portion integral with and having a greater
transverse dimension than the foot portion, whereby the head
portion engages and releasably holds the adjacent cover plate end
portion when the retainer strip is inserted into the receiving
groove.
2. The frame structure of claim 1 wherein said
retainer-strip-receiving groove has a plurality of opposed,
longitudinal, inward directed projections.
3. The frame structure of claim 2 wherein the foot portion of said
retainer strip has at least one pair of opposed, longitudinal
projections adapted to firmly but removably engage said
retainer-strip-receiving groove projections in the inserted
position.
4. The frame structure of claim 2 wherein the foot portion of said
retainer strip has a plurality of pairs of opposed, longitudinal
projections adapted to firmly but removably engage said receiving
groove projections in the inserted position.
5. The frame structure of claim 2 wherein the axis of said
retainer-strip-receiving groove is substantially perpendicular to
the face defined by said elongated frame member.
6. The frame structure of claim 1 wherein the axis of said
retainer-strip-receiving groove forms an acute angle with the face
defined by said elongated frame member.
7. The frame structure of claim 6 wherein said elongated retainer
strip head portion has a greater transverse dimension on the side
of said receiving groove closest to said cover plate end portion
than on the side of said receiving groove further removed from said
cover plate end portion.
8. A mullion structure for a heated door mounting frame for a
refrigerated cabinet comprising:
an elongated frame member defining a face, said frame member having
first and second longitudinal end portions;
first and second longitudinal cover-plate-retaining slots formed
adjacent said first and second longitudinal frame member end
portions;
at least one longitudinal heater-element-receiving grooves formed
in the face intermediate the frame member end portions;
a longitudinal retainer-strip-receiving groove formed in the face
intermediate the frame member end portions;
first and second elongated cover plates, each cover plate having
one longitudinal edge disposed in one of said cover-plate-retaining
slots and its other longitudinal edge disposed adjacent the edge of
said retainer-strip-receiving groove nearest its respective
cover-plate-retaining slot; and
an elongated retainer strip having a foot portion releasably
insertable in holding relation into the retainer-strip-receiving
groove, and a head portion integral with and having a greater
transverse dimension than the foot portion, whereby the head
portion engages and releasably holds the adjacent cover plate end
portions when the retainer strip is inserted into the receiving
groove.
9. The mullion structure of claim 8 further comprising:
a first elongated flange extending rearward from said first frame
member end portion;
a second elongated flange extending rearward from said second frame
member end portion;
a third longitudinal cover plate retainer slot formed in said first
flange;
a second longitudinal retainer-strip-receiving groove formed in
said second flange;
an elongated backplate having first and second longitudinal edges,
one longitudinal edge disposed in said third cover plate retainer
slot, the other longitudinal edge disposed adjacent said second
retainer-strip-receiving groove; and
a second elongated retainer strip having a foot portion releasably
insertable in holding relation into the retainer-strip-receiving
groove, and a head portion integral with and having a greater
transverse dimension than the foot portion, whereby the head
portion engages and releasably holds the adjacent backplate end
portion when the retainer strip is inserted into the receiving
groove.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to refrigerators and, more particularly, to
refrigerator door mounting frame structures adapted to contain
heater elements.
2. Description of the Prior Art
Low-temperature commercial refrigerator and freezer compartments
are usually provided with a door mounting frame within which one or
more doors are pivotally mounted. The doors are typically provided
with gaskets extending around their periphery for sealing
engagement with an outer surface of the door mounting frame to
assure that the gasket sealingly engages the freezer door
opening.
When a door is opened, the differential in temperature between the
interior and exterior of the refrigerator compartment causes
condensation to form on the contacting portions of the door and the
door mounting frame. It has been found necessary to prevent such
condensation from freezing and detrimentally affecting both the
ease of opening the door as well as the attractiveness of the
freezer. For this purpose, it is known to heat the door mounting
frame. For this purpose, heater wires are customarily imbedded in
grooves or channels behind the faceplate, thereby heating the
contacting surfaces between the door and the door mounting frame to
prevent the formation of ice and condensate thereon. Such a
structure, for example, is illustrated in U.S. Pat. No. 2,731,804
issued to J. V. GRUBBS, SR.
Although the resistive heater wires generally have long operating
lives, they occasionally do need replacing. A means therefor must
be provided to gain ready access to these heater wires for their
removal and replacement. Although various approaches have been
suggested, most such approaches adopt the expedient of securing the
faceplates to the door mounting frame with a relatively large
number of screw fasteners positioned about the frame. Upon removal
of the screws the faceplate is detachable, thus providing access to
the heater wires. While such an approach does render the heater
wires accessible, it is subject to several severe
disadvantages.
First, modern refrigerator and freezer cabinet door mounting frames
are typically fabricated from extruded lightweight metal materials,
such as aluminum. The drilling of this material to provide the
necessary threaded receptacle for the screws is time-consuming and
cumbersome. Further, the assembly and disassembly of the faceplate
requires the insertion and removal of a substantial number of screw
fasteners greatly increasing both the assembly and servicing times
of the door mounting frame structure.
SUMMARY OF THE INVENTION
Briefly stated, the present invention provides a refrigerator door
mounting frame structure which comprises a plurality of elongated
frame members. Each such member defines at least a face having
first and second longitudinal end portions.
An elongated cover-plate-retaining slot is formed adjacent the
first end portion. At least one longitudinal
heater-element-receiving groove is formed in the face intermediate
the end portions. The heater-element-receiving groove is adapted to
have at least one heating element positioned therein. A
longitudinal retainer-strip-receiving groove is formed in the face
further removed from the first end portion than is the
heater-element-receiving groove. An elongated cover plate is
positioned over the face in covering relation to the
heater-element-receiving groove.
One longitudinal end portion of the cover plate is disposed in the
cover-plate-retaining slot. The other longitudinal end portion of
the cover plate is positioned adjacent the retainer-strip-receiving
groove. A retainer strip is provided having a foot portion and a
head portion integral with and having a greater transverse
dimension than the foot portion. The foot portion is releasably
insertable in holding relation into the retainer-strip-receiving
groove. When thus inserted, the head portion engages and releasably
holds the adjacent cover plate end portion. The cover plate is thus
supported along both its longitudinal edges.
To remove the cover plate it is only necessary to pull the retainer
strip out from the retainer-strip-receiving groove and thereafter
slide the faceplate out from the cover-plate-retaining slot, thus
providing rapid access to the heater elements. In like manner,
assembly of the structure is effected by simply positioning the
cover plate in the cover-plate-retaining slot and inserting the
cover plate retainer strip.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects of the invention will become apparent from
a study of the following description and drawings in which:
FIG. 1 is a perspective view of a commercial refrigerator or
freezer door mounting frame including a plurality of side-by-side
mounted refrigerator doors;
FIG. 2 is a partial sectional view of the frame and door structure
of FIG. 1 as seen from the top;
FIG. 3 is a cross-sectional view of a mullion structure configured
in accordance with the principles of the current invention;
FIG. 4 is a cross-sectional view of a peripheral door mounting
frame member constructed in accordance with the principles of the
present invention;
FIG. 5 is a cross-sectional view partially broken away of an
alternate embodiment of the member showing FIG. 4;
FIG. 6 is a partial sectional, side elevational view of a portion
of a door mounting frame constructed in accordance with the
principles of the present invention;
FIG. 7 is a schematic view of a heater wire matrix of the device of
FIG. 1;
FIG. 8 is a view partially broken away of the mullion and top
peripheral elongated door mounting frame members illustrating the
placement of the heater wires in accordance with the principles of
the present invention;
FIG. 9 is a perspective view of a faceplate retainer strip
positioned within a retainer-strip-receiving groove in accordance
with the principles of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, there is shown in FIGS. 1, 2, and 6
a refrigerated cabinet 20, which includes a door mounting frame 21
within which are mounted a plurality of refrigerator doors 10A. .
.10N. Frame 21 is constructed of upper and lower elongated members
22 and 23, side elongated members 24 and 25, and one or more
mullions 26 interconnecting top and bottom elongated members 22 and
23. The frame 21 is mounted in refrigerator or freezer wall 31.
Doors 10A and 10N are pivotally mounted to be framework thus
described in any suitable well-known manner, not shown. The
framework is preferably fabricated from a lightweight metal
material such as extruded aluminum.
The framework structure is suitably secured to the refrigerator
walls as by a plurality of screw fasteners 49. As seen best in
FIGS. 2 and 6, peripheral door mounting frame members 22, 23, 24
and 25 are provided with longitudinal grooves of channels 70, 71,
72 and 73, respectively. The grooves preferably interconnect to
form a continuous groove or channel about the periphery of frame
21. Each mullion, such as the exemplary mullion 26 in FIG. 2, is
also provided with at least one longitudinal groove. Exemplary
mullion 26, FIG. 2, is shown provided with four such longitudinal
grooves 40, 41, 42 and 43, respectively.
The longitudinal mullion grooves preferably interconnect with the
corresponding grooves in peripheral frame members 22 and 23 to
provide a groove matrix corresponding to the points of contact
between the door mounting frame and the doors. At least one, and
preferably a plurality, of resistance heater wires are positioned
within the groove matrix thus defined. The heater wires serve to
heat the area of contact between the door mounting frame and the
doors in a manner well known in the concerned art. The resistance
heater wires are disposed within the grooves in accordance with the
wiring pattern as best seen in FIGS. 7 and 8.
As shown in FIG. 2 and 6, magnetic gaskets 47 are positioned around
the inside periphery of the doors in the usual manner. To provide a
suitable contact surface for the gaskets and to enable ready
fabrication and servicing of the heating wire matrix thus
described, a plurality of removable elongated cover plates are
mounted to the faces of the peripheral door mounting frame members
and mullions. The cover plates are preferably fabricated from a
suitable corrosive resistant magnetic material such as stainless
steel.
As all the peripheral frame members and all of the mullions are
substantially similar, only one of each type will be described in
detail. Referring now to FIG. 3, a detailed cross section of
exemplary mullion 26 is illustrated. Mullion 26 includes a front
portion 9 and side flanges 91 and 92. The front portion of mullion
26 defines a face portion 95, in which longitudinal heater element
receiving grooves 40, 41, 42 and 43 are formed. Longitudinal
cover-plate-retaining slots 97 and 98 are formed at the extremities
of front mullion portion 90. A longitudinal
retainer-strip-receiving groove 101 is formed on the face side of
the forward portion of the mullion, as shown. The
heater-element-receiving grooves, cover-plate-retaining slots and
retainer-strip-receiving groove preferably all extend substantially
the full length of the mullion.
A pair of elongated cover plates 60 and 61 are positioned, as
shown, each having one longitudinal edge disposed in a
corresponding cover-plate-retaining slot. The other longitudinal
end of each cover plate is disposed adjacent the
retainer-strip-receiving groove.
As best seen in FIG. 9, an elongated flexible retainer strip 51 is
removably positioned within the retainer-strip-receiving groove
101. The retainer strip, preferably fabricated from a material such
as rubber, PVC, or other flexible material, has a foot portion 52
and a head portion 50. The head portion preferably has a greater
transverse dimension than the foot portion. The foot portion of the
retainer strip is provided with one or more longitudinal ears of
projections 54. The retainer-strip-receiving groove preferably is
provided with a plurality of longitudinal teeth or projections 103.
Teeth 103 are inward directed, as shown, to enable ready insertion
of the elongated retainer strip within the retainer-strip-receiving
groove. When thus inserted, the teeth 103 engage ears 54 to retain
the strip within the groove in fixed but nonetheless removable
relation.
In the inserted position, head 50 of retaining strip 51 engages the
adjacent longitudinal edge portions of cover plates 60 and 61. Each
cover plate therefore is supported about both its longitudinal
edges. No additional nails, screws, or other fasteners are
required. To remove the cover plates and thus gain access to the
resistive heating wires, it is only necessary to pull the single
cover strip 50 from groove 101. Thereafter, the cover plates
readily slide out from their respective retaining slots exposing
the heater wires mounted therebehind.
The back portion of mullion 26 is preferably provided with a
backplate 86, as shown. Plate 86 may be used to mount various light
fixtures, shelving standards, and other attendant refrigerator
cabinet paraphernalia, if desired. Plate 86 is also preferably
secured to mullion 26 in accordance with the principles of the
present invention. For this purpose, a mullion side flange 92 is
provided with a longitudinal cover-plate-retaining slot 96. An
opposite mullion side flange 91 is, as illustrated, provided with a
longitudinal retainer-strip-receiving groove 115 and retainer strip
116 similar to receiving groove 101 and retainer strip 50 as
already described. Backplate 86 is thus removably supported by
retaining slot 96 and retainer strip 116.
Referring now to FIG. 4, a cross section of a suitable elongated
peripheral frame member such as frame member 25 is illustrated.
Frame member 25, as shown, includes a rear flange assembly 70, a
front flange 72, and an integral interconnecting web 71. Front
flange 72 and intervening web 71 are provided in a manner well
known in the art, to enable the exemplary doors described to assume
the so-called recessed configuration. Rear flange extensions 104,
105 and 106 define a face plane behind which a channel 77 is
formed. Channel 73 is adapted to contain one or more heater wires
130 and 131. Heater wires 130 and 131 are maintained within channel
73 in spaced relation by a plurality of spring clips 118 as best
seen in FIG. 8. Referring again to FIG. 4, at one extremity of the
rear flange portion 70, flange extensions 104 and 107 define a
longitudinal cover-plate-retaining slot 78 adapted to receive a
cover plate 65, as illustrated. At the other end of the rear
flange, a longitudinal retainer-strip-receiving groove 79 is
formed. The axis of receiving groove 79 forms an angle preferably
greater than 45.degree. with the face plane defined by cover plate
65.
An elongated cover-plate-retainer strip 55 is removably positioned
within the retainer-strip-receiving groove 79. However, the
retainer strip illustrated in FIG. 4 differs from that already
described in that retainer strip 55 has a head portion 56 of
greater transverse dimension than head portion 57, as shown. This
enables the head portion 56 to more securely engage cover plate 65.
To gain access to the heater wires in channel 73, it is only
necessary to remove the cover-plate-retaining strip 56 and slide
the cover plate 65 from retainer slot 78.
Shown in FIG. 5 is an alternate embodiment of the structure shown
in FIG. 4 wherein the retainer-strip-receiving groove 79A has an
axis position substantially at 45.degree. with respect to the plane
defined by faceplate 65. In this construction, strip 50 has a head
portion of substantially symmetrical transverse configuration.
Although the embodiments of FIGS. 4 and 5 have the
retainer-strip-receiving grooves positioned substantially at the
junction of flange 70 and web portion 71, such is obviously not a
limiting requirement. The retainer-strip-receiving groove could
obviously be formed with suitable structure modifications, within
rear flange extension 109.
The cover plate mounting structure hereinabove described is
particularly suited for ease of door frame maintenance, since only
a single retainer strip need be removed to gain access to the
resistive heater wires mounted therebehind. Further, the structure
above described significantly decreases both the required time and
cost of fabrication of the frame assemblies, since all of the frame
structure may be formed in an extruded manner without the
requirement of drilling any of the frame members to receive screw
fasteners. Likewise, it is not necessary for assembly personnel to
affix a large number of screws during the assembly operation.
Rather, only a single, easily insertable strip need be applied to
secure each cover plate to its related frame member.
* * * * *