US3719303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator cabinet construction for releasing foam insulation
Assignee: Motors Liquidation Co
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Filing: 1971-11-01
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Granted: 1973-03-06
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Expires: 1991-11-01
Abstract
Abstract A refrigerator cabinet having an outer metal shell, a plastic inner liner, and foamed-in-place insulation therebetween together with the application of a foam insulation release agent coextensive with the inner surface of the metal shell except for a single horizontal adherence seam devoid of the release agent on both sides and the rear wall of the shell to produce a cabinet capable of maintaining interior dimensions while allowing for differences in coefficients of thermal expansions between the liner and shell.
Inventors
- 👤 P Kronenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:46
CPC Classifications
F; F25; F25D; F25D23/00; F25D23/06; F25D23/062; F25D23/064; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3411; B29C33/00; B29C33/56; B29C33/60; B29L; B29L2031/00; B29L2031/762; B29L2031/7622; F25D2500/00; F25D2500/02; Y; Y10; Y10S; Y10S220/00; Y10S220/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
338 words
a refrigerator construction comprising, an outer steel shell member providing rear, side, bottom and top walls defining a refrigerator cabinet, a substantially box-like preformed liner member of A.B.S. plastic material nested substantially within said shell member, each of said members having coextensive surfaces disposed in spaced-apart face-to-face relationship with a rigid polyurethane insulation foamed into the space therebetween and adhering to said liner member to form a composite plastic structure, said steel shell member having a lesser coefficient of thermal expansion than said composite plastic structure, wherein the improvement comprises a release agent coating on the inner face of the side, back, bottom and top walls of said shell member and generally coextensive therewith, said release agent coating having a non-adherence characteristic with respect to the interface between said composite plastic structure and said shell member, said release agent coating being arranged in a pattern such that in a continuous horizontal adherence band region having a width of approximately 9 to 12 inches on the inner face of said shell member in which said shell member is devoid of said release agent coating, said band region extending the full width of each of said side walls and across the back wall of said shell member with the center line of said band region positioned approximately midway between the upper and lower ends of said side and back walls whereby a firm adherence bond is established coextensive with said continuous band region between said composite plastic structure and said shell member to retain said steel shell member in generally fixed relationship with said composite plastic structure thereby to maintain interior dimensions of the cabinet, said release agent coating preventing the bonding of said composite plastic structure and said steel shell member to allow for relative thermal expansion and contraction of said steel shell member with respect to said composite plastic structure in areas other than said adherence band region when said cabinet is subjected to high and low temperature extremes thereby to obviate stress cracking of said liner member.
Claim 2
Dependent Claim
338 words
a refrigerator construction comprising, an outer steel shell member providing rear, side, bottom and top walls defining a refrigerator cabinet, a substantially box-like preformed liner member of A.B.S. plastic material nested substantially within said shell member, each of said members having coextensive surfaces disposed in spaced-apart face-to-face relationship with a rigid polyurethane insulation foamed into the space therebetween and adhering to said liner member to form a composite plastic structure, said steel shell member having a lesser coefficient of thermal expansion than said composite plastic structure, wherein the improvement comprises a release agent coating on the inner face of the side, back, bottom and top walls of said shell member and generally coextensive therewith, said release agent coating having a non-adherence characteristic with respect to the interface between said composite plastic structure and said shell member, said release agent coating being arranged in a pattern such that in a continuous horizontal adherence band region having a width of approximately 9 to 12 inches on the inner face of said shell member in which said shell member is devoid of said release agent coating, said band region extending the full width of each of said side walls and across the back wall of said shell member with the center line of said band region positioned approximately midway between the upper and lower ends of said side and back walls whereby a firm adherence bond is established coextensive with said continuous band region between said composite plastic structure and said shell member to retain said steel shell member in generally fixed relationship with said composite plastic structure thereby to maintain interior dimensions of the cabinet, said release agent coating preventing the bonding of said composite plastic structure and said steel shell member to allow for relative thermal expansion and contraction of said steel shell member with respect to said composite plastic structure in areas other than said adherence band region when said cabinet is subjected to high and low temperature extremes thereby to obviate stress cracking of said liner member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |