US3688384A
Expired / Lapsed
US
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Method of producing a synthetic resin box with double wall structure
Assignee: Mitsubishi Chemical Corp
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Filing: 1970-08-14
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Granted: 1972-09-05
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Expires: 1990-08-14
Abstract
Abstract A method of producing a synthetic resin-made box with double wall structure, adapted for use as the box frame of a refrigerator or the like, comprising the steps of molding a double-walled box body of a synthetic resin in a metal mold by injection molding in such a manner that wall sections constituting the inner wall of the box body are formed integrally, while wall sections constituting the outer wall of the box body are formed separately extending obliquely outwardly with one edge each thereof connected to said respective inner wall sections, after molding bringing said outer wall sections to the normal positions extending horizontally or vertically in adjacent relation to said inner wall sections respectively, connecting the adjacent edges of said outer wall sections with each other by means of coupling members, filling the space defined between said inner wall and said outer wall with a heat insulating material and closing the open rear end of the box body with a closure plate.
Inventors
- 👤 Kyohei Mizushima
- 👤 Yukio Yada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:04
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0053; B29C45/0055; A; A47; A47B; A47B47/00; A47B47/04; A47B47/042; A47B55/00; F; F25; F25D; F25D23/00; F25D23/06; F25D23/062; F25D23/064; F25D2500/00; F25D2500/02; Y; Y10; Y10S; Y10S220/00; Y10S220/902; Y10S264/00; Y10S264/66; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T29/49947
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A method of producing a synthetic resin-made box with double wall structure, which comprises molding a double-walled box body of a synthetic resin in a metal mold by injection molding in such a manner that the inner wall sections of the box body are formed integrally and the outer wall sections thereof are formed having one end each connected to said inner wall sections respectively with the other portions being separated therefrom and obliquely extending outwardly from said one ends, and after removing the box body from the mold bringing said outer wall sections into the normal positions extending vertically or horizontally in adjacent relation to said respective inner wall sections and connecting the adjacent edges thereof with each other.
Claim 2
Independent Claim
120 words
A method of producing a synthetic resin-made box with double wall structure, which comprises molding a double-walled box body of a synthetic resin in a metal mold by injection molding in such a manner that the inner wall sections of the box body are formed integrally and the outer wall sections thereof are formed having one end each connected to said inner wall sections respectively with the other portions being separated therefrom and obliquely extending outwardly from said one ends, and after removing the box body from the mold bringing said outer wall sections into the normal positions extending vertically or horizontally in adjacent relation to said respective inner wall sections and connecting the adjacent edges thereof with each other.
Claim 3
Dependent Claim
61 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which any one of the two sets of opposed outer wall sections are extended and said extended portions are folded inwardly of each other and coupled together at the adjoining edges thereof, so as to close the back side of the box body.
Claim 4
Dependent Claim
65 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which one or two of said outer wall sections are not formed during molding of the box body and the portion or portions of the box body where the outer wall sections are not formed is or are closed with a suitable panel or panels produced separately.
Claim 5
Dependent Claim
58 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which an aventurine or engraved pattern is formed on the shaping surfaces of said metal mold, so that the corresponding pattern may be formed on the outer surfaces of said outer wall sections concurrently with molding of the box body.
Claim 6
Dependent Claim
58 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which recesses such as elongate grooves are formed in the shaping surfaces of said metal mold, whereby shelf supporting projections or ribs are formed on the inside surfaces of said inner wall sections concurrently with molding of the box body.
Claim 7
Dependent Claim
100 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which said mold consists of a mold member having a depression formed therein and a cooperating mold member having a projecting land formed thereon for interlocking engagement with said depression, said depression and said projecting land being located on the side remote from the side on which molten resin in injected, whereby the area of projection can be decreased, providing for the use of a small-sized injection molding machine, stabilization of the metal mold and hence production of a precise box body.
Claim 8
Dependent Claim
95 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which the outer wall section molding surfaces of said mold are outwardly gently curved from the portions corresponding to said one ends of said outer wall sections and, in bringing the molded outer wall sections back into the normal positions thereof, said outer wall sections are deformed little by little over the range of the lengths thereof, whereby the necessity of forming a thin portion at said one end of each outer wall section can be eliminated.
Claim 9
Dependent Claim
112 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which recesses are formed in those of the shaping surfaces of the mold which shape the inside surfaces of the outer wall sections, so as to form complementary projections on the inside surfaces of said outer wall sections, whereby the molded box body can be retained on that one of the mold members from which it can be separated relatively easily, by the engagement between said recesses and said projections, whereby said projections can be used for mounting a back panel on the box body after said box body is removed from the mold.
Claim 10
Dependent Claim
113 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which said metal mold consists of a mold member having bores formed therein and a cooperating mold member having projections formed thereon for interlocking engagement with said bores, said bores and said projections being located at those shaping surfaces of the mold which form connecting portions between the outer wall sections and the inner wall sections, being held in interlocking engagement with each other, whereby equipment mounting holes are formed in the molded box body and the mold members are held stable in the molding position, providing for the production of a precise box body.
Claim 11
Dependent Claim
78 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which recesses are formed in those of the shaping surfaces of the mold which form the connecting portions between the outer wall sections and the inner wall sections, and elements, such fittings for a door are placed in said recesses respectively prior to molding, whereby said elements are cast in said connecting portions concurrently with molding of the box body.
Claim 12
Dependent Claim
56 words
A method of producing a synthetic resin-made box with double wall structure, as defined in claim 1, in which the gap formed between the molding members is progressively reduced in width at a location remoter from the side where the molten resin is injected so as to facilitate injection of the molten resin into said gap.
References Cited (Backward Citations)
US2962183A
Cited
US3044161A
Cited
AT237227B
Cited
US3163686A
Cited
US3622418A
Cited
US3616012A
Cited
US3601463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |