US3910658A

US3910658A - Refrigeration apparatus enclosure structure

Info

Publication number: US3910658A
Application number: US433070A
Authority: US
Inventors: Robert E Lindenschmidt
Original assignee: Whirlpool Corp
Current assignee: Whirlpool Corp
Priority date: 1974-01-14
Filing date: 1974-01-14
Publication date: 1975-10-07
Anticipated expiration: 1992-10-07
Also published as: CA1029076A; AU7669074A; BR7500239A

Abstract

A refrigeration apparatus enclosure and method of forming the same wherein an inner laminate wall is provided in an outer cabinet for providing the sheet liner and insulation portions of the refrigeration apparatus enclosure. The laminate wall is folded along lines cut through the insulation to conform to the configuration of the outer cabinet and insulation is provided for filling the resultant voids to complete the enclosure construction. The voids may be filled by foam blocks which may be cemented in place to aid in bonding the laminate wall to the outer cabinet. The rear wall of the cabinet may comprise a flat laminate wall and a divider wall may be provided within the cabinet for dividing the space therein into separate compartments. The divider wall may comprise a laminate wall and in one embodiment, comprises an extension of a laminate wall lining the cabinet.

Description

United States Patent [191 Lindenschmidt [451 Oct. 7, 1975 REFRIGERATION APPARATUS ENCLOSURE STRUCTURE [75] Inventor:' Robert E. Lindenschmidt,

Evansville, Ind.

22 Filed: Jan. 14, 1974 21 Appl.No.:433,070

[52] US. Cl. 312/214; 52/631; 62/D1G. 13;

220/9 G [51] Int. Cl. A47B 71/00; B65D 25/14 [58] Field of Search 312/214, 236, 245;

220/9 F, 9 G; 62/DIG. 3, DlG. 13; 52/631; 161/117 Primary ExaminerRobert L. Wolfe Assistant ExaminerKenneth J. Dorner Attorney, Agent, or Firm--H0fgren, Wegner, Allen, Stellman & McCord [5 7] ABSTRACT A refrigeration apparatus enclosure and method of forming the same wherein an inner laminate wall is provided in an outer cabinet for providing the sheet liner and insulation portions of the refrigeration apparatus enclosure. The laminate wall is folded along lines cut through the insulation to conform to the configuration of the outer cabinet and insulation is provided for filling the resultant voids to complete the enclosure construction. The voids may be filled by foam blocks which may be cemented in place to aid in bonding the laminate wall to the outer cabinet. The rear wall of the cabinet may comprise a flat laminate wall and a divider wall may be provided within the cabinet for dividing the space therein into separate compartments. The divider wall may comprise a laminate wall and in one embodiment, comprises an extension of a laminate wall lining the cabinet.

21 Claims, 9 Drawing Figures US. Patent 0m. 7,1975 Sheet 1 of 3 3,910,658

Sheet 3 0f 3 REFRIGERATION APPARATUS ENCLOSURE STRUCTURE BACKGROUND OF THE INVEN'HON 1. Field of the Invention This invention relates to refrigeration appliances, and in particular, to enclosures therefor.

2. Description of the Prior Art In conventional refrigeration appliance cabinet constructions, an outer metal cabinet is provided having an inner liner which may conventionally be formed of plastic spaced inwardly therefrom to define a space in which is provided suitable insulation. The insulation may be in the form of fiberglass pads and in one improved form, the insulation comprises foamed-in-place insulation. One such foamed-in-place refrigeration apparatus enclosure construction is shown in US. Pat. No. 2,962,183 of J. C. Rill, Jr. et al. Such foamed-inplace cabinet constructions are relatively costly as they utilize separate liner elements, relatively costly preparations for the foaming operation, and costly fixtures for accurately retaining the cabinet and liner elements during the foaming operation. The liners are relatively expensive in that they require relatively costly tooling and processing steps, and the cost problems of such conventional foamed-in-place construction are aggravated where a number of different size models must be provided.

One attempted solution to this problem is that shown in US. Pat. No. 3,635,536 of Robert Lackey et 211., wherein a portable refrigerator is shown as having a low cost cabinet utilizing a foam slab box having integral sides formed of a single sheet of foamed plastic. This patent teaches that if the foamed plastic is formed in a chilled mold process, coating of the inner and outer sides of the sheet may be omitted as the plastic is thusly formed with a thick impervious skin. In the absence of such a molding process, metal vinyl-clad sheets of extremely thin gauge may be utilized as an outer facing material. The box sides are formed from a notched slab which permits folding to the box configuration. The

notches comprise cut portions on the inside of the sheet permitting the thick slab to be folded inwardly to form the box sides.

SUMMARY OF THE INVENTION The present invention comprehends an improved refrigeration apparatus enclosure construction including an outer cabinet, an inner laminate wall within the outer cabinet defined by an inner sheet liner and outer insulation extending between the inner sheet liner and the outer cabinet, the inner liner having folded corner portions to conform the laminate to the contours of the outer cabinet, the insulation being cut through at the folded portions to define voidsoutwardly of the folded liner portions, and insulation means filling the voids.

The invention further comprehends a method of constructing such a refrigeration apparatus enclosure including the steps of fabricating an outer cabinet, providing a flat laminate of sheet liner and insulation, slitting the insulation along lines corresponding to the corners of the outer cabinet, folding the sheet liner at the slits with the sheet liner disposed inwardly, fitting the The insulation means may define means for bonding the laminate wall to the outer cabinet and in the illustrated embodiment comprises preformed blocks of insulation material. The laminate wall may be bonded to the outer cabinet by suitable bonding means as desired.

. The invention may be utilized to provide a multiple compartment enclosure including a divider wall between a pair of U-shaped laminate walls defining a pair of refrigeration chambers within the cabinet. The divider wall may further comprise a laminate wall, and in one form of the invention, comprises an integral extension of one of the U-shaped laminate walls.

The rear wall of the enclosure may comprise a laminate wall with the rear edge of the U-shaped walls butted thereto. The inner sheet liner is effectively spaced from the outer cabinet by the insulation of the laminate wall construction to provide desired insulation between the liner and outer cabinet. The divider wall may be mounted in the manner of a shelf on suitable brackets provided on the U-shaped walls.

The outer insulation of the laminate wall may include an outer vapor barrier portion. The laminate wall insulation may comprise a rigid urethane foam and the inner sheet liner may be formed selectively of plastic or sheet metal as desired. A head of adhesive sealant may be utilized to seal the seams between the inner sheet liner portions within the enclosure.

Thus, the refrigeration apparatus enclosure of the present invention is extremely simple and economical of construction while yet providing the highly desirable features discussed above.

BRIEF DESCRIPTION OF THE DRAWING Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing wherein:

FIG. 1 is perspective view of a refrigeration apparatus having an enclosure embodying the invention;

FIG. 2 is a fragmentary perspective view of a pair of laminate sheets illustrating the process of forming the same into laminate wall elements of the enclosure construction;

FIG. 3 is an exploded perspective view illustrating the arrangement of the laminate walls in constructing the enclosure of the invention;

FIG. 4 is a vertical front section of the enclosure substantially along line 4-4 of FIG. 3 after assembly and having a divider wall therein dividing the space within the cabinet into a pair of refrigeration chambers;

FIG. 5 is a fragmentary enlarged vertical section taken substantially along the line 5-5 of FIG. 1;

FIG. 6 is a vertical section taken substantially along the line 66 of FIG. 5; and

FIG. 7 is a front elevation illustrating a modified form of laminate wall arrangement for use in such a refrigeration apparatus enclosure.

FIG. 8 is a front elevation illustrating the form of laminate wall arrangement for use in a side-by-side refrigerator-freezer.

FIG. 9 is a front elevation illustrating the form of laminate wall arrangement for use in a vertical freezer.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the exemplary embodiment of the invention as shown in FIGS. 1-6 of the drawing, a refrigeration apparatus generally designated 10 illustratively comprises a refrigerator defining an above-freezing compartment 12 and a below-freezing compartment 1 1 defined by an insulated enclosure 13 provided with a pair of

doors

14 and 15 for selectively

closing chambers

11 and 12. The refrigeration apparatus may include conventional evaporator means 16, control means 17, shelves 18 supported by brackets 70, and drawer means 19. The present invention is concerned with the forming of the insulated enclosures l3 and as will be obvious to those skilled in the art, it may be utilized with other arrangements of refrigeration appliances, the refrigeratorfreezer arrangement of FIGS. 1, 8 and 9 being illustrative only.

Broadly, as shown in FIG. 3, the invention comprehends providing an enclosure 13 defined by an outer cabinet generally designated 20, rear wall means generally designated 21, and wall means 22 cooperating with rear wall means 21 to provide an insulative lining of the cabinet. The outer cabinet may be formed in a conventional manner from suitable material, such as metal, to define a forwardly opening box-like construction having a top wall 23, left sidewall 24, right sidewall 25, rear wall 26, bottom wall 27, and a flange 9 extending around the periphery of the front opening 8. Wall means 21 and 22 cooperatively provide an inner sheet liner means and a body of insulation between the inner sheet liner means and outer cabinet to form the completed enclosure 13.

More specifically, as shown in FIG. 2, the laminate wall means 21 and 22 may be formed from a laminate sheet generally designated 28 defined by a flat sheet liner portion 29 of metal or plastic and a body of insulation 30 bonded between the sheet liner 29 and a thin plastic sheet 45 to form a laminate sandwich which may be provided in continuous length by suitable apparatus (not shown). At spaced intervals, the insulation is cut through such as at

slits

31, 32, 33 and 34, permitting the sheet liner 29 to be folded along the insulation slit lines into a pair of U-shaped

laminate wall elements

35 and 36 to define the laminate wall means 22. The flat laminate sheet 28 may be cut into

discrete portions

37 and 38 to form the rear wall means 21, as shown in FIG. 3. As shown therein, the first laminate wall element 35 defines an upwardly opening U-shaped configuration and the second laminate wall element 36 defines a downwardly opening U-shaped configuration. The U- shaped configuration and slit insulation allow manipulation of the laminate past the flange 9 when inserting the elements into the cabinet 13 through front opening 8.

As further shown in FIG. 3, cabinet rear wall 26 is provided with a plurality of locating support posts 39 and rear

laminate wall portions

37 and 38 are provided with a plurality of corresponding openings 40 for receivin g the support posts both for locating the

rear wall portions

37 and 38 in centered relationship to the

Walls

23, 24, 25 and 27 of the outer cabinet and for securing the

laminate wall portions

37 and 38 to the rear wall 25 of the cabinet. a

As may be seen in FIG. 3, the folded corners of the U-shaped

laminate wall elements

35 and 36 define voids 41. Further, as shown in FIG. 4, as the rear

laminate wall portions

37 and 38 are spaced inwardly from the

cabinet walls

23, 24, 25 and 27, respectively, a peripheral void 42 extends fully about the rear laminate wall means 21. In the illustrated embodiment, void 42 is filled with fiberglass insulation 43 as shown in FIG.

6 which may be installed therein prior to the installation of the

U-shaped wall elements

35 and 36. By utilizing the separate openingly confronting

U-shaped elements

35 and 36, different insulation thicknesses in the insulation means of the refrigeration and freezer compartments of the enclosure 13 may be provided. Further, as seen in FIG. 4,

laminate wall elements

35 and 36 may be maintained spaced apart to provide a thermal break in the resultant space between the two compartments.

As shown in FIG. 5, the voids 41 may be filled with insulation 44. In the illustrated embodiment, insulation 44 comprises preformed blocks of insulation material, such as urethane foam, which may be suitably cemented in place as desired. 7

The laminate walls may further be bonded to the cabinet walls by suitable bonding adhesive as desired. In the illustrated embodiment, the plastic sheet 45 of the laminate walls functions as an outer vapor barrier.

As illustrated in FIG. 6, a bead of flexible adhesive sealant 46 may be laid along the seams between the sheet liner portion of the U-shaped

laminate wall elements

35 and 36 and the front surface of the rear

laminate wall portions

37 and 38.

Conventional breaker strip trim 47 may be assembled onto the

U-shaped wall elements

35 and 36 and flange 9 as shown in FIG. 1.

As best seen in FIGS. 4 and 5, the

compartments

11 and 12 are separated by a divider wall, or mullion, 48 which is retained between the sidewalls of the enclosure by means of a channel bracket 49 secured to sheet liner 29 of upper U-shaped wall element 36 and sheet liner 29 of lower U-shaped wall element 35 adjacent gap 50 so as to straddle the gap and effectively close the same along the sidewalls of the enclosure. The channel bracket 49 further extends across the

rear wall portions

37 and 38 to effectively close the gap 56 between these portions. Divider wall 48, as best seen in FIG. 5, may comprise a pair of laminate walls including a sheet liner portion 51 and insulation portion 52 to define a double laminate sandwich having top and bottom metal or plastic sheet liner wall portions exposed to the

chambers

12 and 11, respectively. The bracket may be secured to the liners 29 by suitable fasteners, such as screws, 54. While the divider wall 48 effectively covers the gap 56 between the

rear wall portions

37 and 38 as well as the gap 50 along the sidewalls of the enclosure, the top chamber 12 is effectively thermally insulated from the lower chamber 11 by the break in the laminate wall means.

In an alternative form, as shown in FIG. 7, the divider wall 148 may comprise an integral extension of the lower U-shaped laminate wall 135. A metal top plate may be provided on the divider wall to cover the single thickness laminate sheet insulation. The form of the" laminate structure for a side-by-side refrigeratorfreezer is shown in FIG. 8. In this embodiment, the two U-shaped elements are horizontally opposed with element 235 in the above-freezing compartment and element 236 in the below-freezing compartment. Divider wall 248 separates the two compartments. For vertical freezers the form of the laminate is shown in FIG. 9, wherein U-shaped element 336 conforms to the top and sides of the cabinet and portion 335 covers the bottom of the cabinet.

The mounting posts 39 for locating and mounting the

rear wall portions

37 and 38 may comprise plastic posts secured to the outer cabinet by suitable fastening means such as screws 57, and to the inner sheet liner 29 of the rear laminate wall portions by suitable means such as screws 58. The screws 58 may further serve to mount support brackets 59 or shelf brackets 70 to the sheet liner as for carrying respectively the evaporator 16 or the shelves 18 in the enclosure.

Thus, the invention comprehends an improved simplified method of constructing a refrigeration apparatus enclosure wherein a plurality of flat laminates defining an inner sheet liner and an outer insulation are provided. The laminates are folded to conform to the internal configuration of the cabinet after firstly slitting the insulation along the desired fold lines with the laminate elements being firstly cut from a continuous low cost laminate stock material. As indicated above, the stock material may include a vapor barrier as an outer por tion of the insulation.

illustrative of the broad inventive concepts comprehended by the invention.

Having described the invention, the embodiment of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A refrigeration apparatus enclosure comprising: an outer cabinet; an inner laminate wall within said outer cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said outer cabinet, said inner liner having at least one folded, continuous corner portion to conform the laminate to the contours of said outer cabinet, said insulation being slit through to said liner at said folded liner portion to define a substantially square section void outwardly of said folded liner portions; and insulation means filling said void.

2. The refrigeration apparatus enclosure of claim 1 wherein bonding means are provided for bonding the laminate wall to the outer cabinet.

3. The refrigeration apparatus enclosure of claim 1 wherein said insulation means comprise preformed blocks of insulation material.

4. The refrigeration apparatus enclosure of claim 1 wherein said insulation means comprise preformed blocks of insulation material cemented to said outer cabinet.

5. The refrigeration apparatus enclosure of claim 1 wherein said insulation means comprise preformed blocks of insulation material cemented to said laminate wall.

6. The refrigeration apparatus enclosure of claim 1 wherein said laminate wall includes an outer vapor barrier portion. 1

7. A refrigeration apparatus enclosure comprising: an

outer cabinet defining a back wall and side, top and liner and at least one of said side, top and bottom walls, said inner liner of the laminate wall element having folded, continuous corner portions to conform said element to the contours of said outer cabinet, said insulation being slit through to said liner at said folded portion to define substantially square section voids; and a laminate wall portion within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet back wall cooperating with said laminate wall element to insulatively line the interior of the cabinet.

8. The refrigeration apparatus enclosure of claim 7 including insulation means filling said voids.

9. The refrigeration apparatus enclosure of claim 7 including another U-shaped inner laminate wall element within said cabinet openingly confronting said U- shaped element.

10. The refrigeration apparatus enclosure of claim 9 wherein said U-shaped element defines a downwardly opening element and said other U-shaped element defines an upwardly opening U-shaped element.

11. The refrigeration apparatus enclosure of claim 9 wherein said U-shaped element is spaced at a distance from said other U-shaped element to define a gap therebetween.

12. The refrigeration apparatus enclosure of claim 11 wherein divider wall means are provided, said divider wall means extending across the interior of the cabinet adjacent said gap for dividing the interior of the cabinet into a plurality of compartments.

13. The refrigeration apparatus enclosure of claim 12 wherein said divider wall means comprises an insulated wall, and bracket means mounting said insulated wall to said laminated wall elements.

14. The refrigeration cabinet of claim 9 including sealant means for sealing said sheet liner of said U- shaped laminate wall elements to said sheet liner of said laminate wall portion.

15. The refrigeration apparatus enclosure of claim 7 including adhesive means for securing said laminate wall portion to said cabinet back wall.

16. The refrigeration apparatus enclosure of claim 7 including means for securing said laminate wall portion to said cabinet back wall in spaced relationship to said cabinet walls, and insulation means disposed between said periphery of said laminate wall portion and said cabinet walls.

17. The refrigeration cabinet of claim 7 including means for securingsaid laminate wall portion to said cabinet back wall in spaced relationship to said cabinet walls, and insulation means disposed between the periphery of said laminate wall portion and said cabinet walls and means for bonding the laminate wall element to the cabinet.

18. The refrigeration cabinet of claim 7 wherein said laminate wall element includes an outer vapor barrier portion.

19. A multiple compartment refrigeration apparatus enclosure comprising:

an outer cabinet defining a back wall and side, top

and bottom walls; 7

a first, upwardly opening U-shaped inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet bottom wall and a lower portion of said cabinet side walls, said inner liner of the first laminate wall having folded continuous corner portions to conform said first laminate to the contours of the lower portion of said outer cabinet, said insulation being slit through to said liner at said folded liner portion to define voids;

a second, downwardly opening U-shaped inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet top wall and an upper portion of said cabinet sidewalls, said inner liner of the second laminate wall having folded continuous corner portions to conform said second laminate to the contours of the upper portion of said outer cabinet, said insulation being slit through to said liner at said folded liner portion to define voids;

a third inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet back wall cooperating with said first and second laminate walls to insulatively line the interior of the cabinet; and

divider wall means extending across the interior of the cabinet adjacent the upper end of said first laminate wall and the lower end of said second laminate wall for dividing the interior of the cabinet into a plurality of compartments.

20. The refrigeration cabinet of claim 19 wherein said divider wall means comprises an integral extension of one of said laminate walls.

21. The refrigeration cabinet of claim 19 wherein said divider wall means comprises a fourth laminate wall.

Claims

6. The refrigeration apparatus enclosure of claim 1 wherein said laminate wall includes an outer vapor barrier portion.

7. A refrigeration apparatus enclosure comprising: an outer cabinet defining a back wall and side, top and bottom walls; a U-shaped inner laminate wall element within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and at least one of said side, top and bottom walls, said inner liner of the laminate wall element having folded, continuous corner portions to conform said element to the contours of said outer cabinet, said insulation being slit through to said liner at said folded portion to define substantially square section voids; and a laminate wall portion within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet back wall cooperating with said laminate wall element to insulatively line the interior of the cabinet.

9. The refrigeration apparatus enclosure of claim 7 including another U-shaped inner laminate wall element within said cabinet openingly confronting said U-shaped element.

14. The refrigeration cabinet of claim 9 including sealant means for sealing said sheet liner of said U-shaped laminate wall elements to said sheet liner of said laminate wall portion.

17. The refrigeration cabinet of claim 7 including means for securing said laminate wall portion to said cabinet back wall in spaced relationship to said cabinet walls, and insulation means disposed between the periphery of said laminate wall portion and said cabinet walls and means for bonding the laminate wall element to the cabinet.

19. A multiple compartment refrigeration apparatus enclosure comprising: an outer cabinet defining a back wall and side, top and bottom walls; a first, upwardly opening U-shaped inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet bottom wall and a lower portion of said cabinet side walls, said inner liner of the first laminate wall having folded continuous corner portions to conform said first laminate to the contours of the lower portion of said outer cabinet, said insulation being slit through to said liner at said folded liner portion to define voids; a second, downwardly opening U-shaped inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet top wall and an upper portion of said cabinet sidewalls, said inner liner of the second laminate wall having folded continuous corner portions to conform said second laminate to the contours of the upper portion of said outer cabinet, said insulation being slit through to said liner at said folded liner portion to define voids; a third inner laminate wall within said cabinet defined by an inner sheet liner and outer insulation extending between said inner sheet liner and said cabinet back wall cooperating with said first and second laminate walls to insulatively line the interior of the cabinet; and divider wall means extending across the interior of the cabinet adjacent the upper end of said first laminate wall and the lower end of said second laminate wall for dividing the interior of the cabinet into a plurality of compartments.