US3712778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for the casting for foamable synthetic resins
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1970-12-10
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Granted: 1973-01-23
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Expires: 1990-12-10
Abstract
Abstract A mold or form for the casting of foamable or expandable synthetic-resin materials and especially multicomponent materials, containing two or more interreacting substances adapted to copolymerize to form the cast body, has a mold cavity and an inlet passage communicating between this cavity and the nozzle of the molding machine (e.g. an injection-molding apparatus). The passage has an inlet portion of generally circular cross-section and fans outwardly to a discharge portion in the form of a narrow slit of a height of 0.2 to 2mm extending over the major portion of the width of the cavity to the point at which the discharge slit communicates with the latter. In addition, the height of the passage tapers downwardly to impart a wedge configuration in a plane of the passage perpendicular to the major dimension of the slit.
Inventors
- 👤 R Lidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:23
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/2701; B29C45/28; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
The mold defined in claim 1 wherein said inlet passage has an intermediate portion connecting said inlet mouth and said slit which fans out in the plane of said slit to the cross-section thereof uniformly and in the plane of said slit.
Claim 2
Dependent Claim
33 words
The mold defined in claim 2 wherein said intermediate portion of said passage has a wedge-like convergence in the direction of said slit in a plane perpendicular to the plane of said slit.
Claim 3
Dependent Claim
25 words
The mold defined in claim 3 wherein said intermediate portion fans out in the direction of said slit at an angle between 30* and 90*.
Claim 4
Dependent Claim
29 words
The mold defined in claim 1 wherein the flow cross-section over substantially the entire length of said passage between the said inlet mouth and said slit is substantially constant.
Claim 5
Dependent Claim
42 words
The mold defined in claim 5 wherein said mold is formed with a pair of separable mold halves, one of said mold halves being provided with a fan-shaped recess defining said inlet passage while the other mold half forms a cover therefor.
Claim 6
Dependent Claim
17 words
The mold defined in claim 1 wherein said slit has a thickness between 0.2 and 2 mm.
Claim 7
Dependent Claim
39 words
The mold defined in claim 1 wherein said slit has a length less than the major dimension of said cavity at said side and the mouth of said slit is rounded out such that said side is tangential thereto.
Claim 8
Dependent Claim
18 words
The mold defined in claim 1 wherein said slit opens into said cavity at the lowest point thereof.
Claim 9
Dependent Claim
282 words
A mold for the forming of synthetic-resin bodies, comprising means forming a mold cavity, and means defining an inlet passage communicating with said cavity along one side thereof and with a source of synthetic resin, said source having a bore opening into an inlet mouth of said inlet passage and of substantially circular cross-section, said inlet passage terminating at said mold cavity in a substantially planar slit opening directly into the mold cavity and having a transitional configuration intermediate said slit and said inlet mouth so constructed and arranged that the change in a dimension of the inlet passage transverse to the direction of flow of the synthetic resin therethrough over any interval of length of the inlet passage is at most equal to such interval, said mold cavity and inlet passage being defined between a pair of separable mold halves, one of said mold halves being provided with recesses defining said cavity and said passage while the other mold half forms a cover for said recesses, said slit having a length equal at least to a major fraction of the major dimension of said recess along said side and a thickness of 0.2 to 2 mm and only a minor fraction of the thickness of said mold along said side, said passage having an intermediate portion fanning from said Inlet mouth to said slit outwardly in the plane of said slit at an angle of 30* to 60* and of a length equal to a major fraction of the overall length of said passage, the thickness of said intermediate portion progressively diminishing in the direction of said slit, the flow cross-section of said inlet mouth and of said slit being equal.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |