US3876356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold transfer molding apparatus
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1974-03-07
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Granted: 1975-04-08
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Expires: 1994-03-07
Abstract
Abstract Apparatus for transfer molding in which the flashpad and most of the material within the runner is maintained below the temperature required to cure the molding material within the cure cycle time, while the material in the mold cavity and a relatively small amount of contiguous material in the runner is cured. A member is provided, between the mold and the transfer pot plate, which defines at least one runner in open communication with the mold cavity and the transfer pot. Adjacent the member is temperature-controlling means to maintain the material in the pot and most of the material in the runner at a temperature high enough to allow the material to flow and be molded, but below that required to cure the material within the cure cycle time.
Inventors
- 👤 Thomas W Fazekas
- 👤 Walter A Hartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/02; B29C2045/027
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
In a molding press including a mold defining at least one mold cavity having an opening extending outside said mold, a pot plate defining a molding compound transfer pot, and a plunger adapted to press molding compound out of said transfer pot into said mold cavity; the improvement being an improved molding compound temperature controlling apparatus disposed between said mold and said pot plate comprising: A. a composite body defining at least one body opening in communication between said transfer pot and said mold cavity and a molding compound temperature controlling member mounted within said body opening; 1. said composite body comprising: a cooling plate disposed adjacent said pot plate; a heating plate disposed adjacent said mold; and a heat insulating layer disposed between said cooling plate and said heating plate; and 2.
Claim 2
Dependent Claim
133 words
In a molding press including a mold defining at least one mold cavity having an opening extending outside said mold, a pot plate defining a molding compound transfer pot, and a plunger adapted to press molding compound out of said transfer pot into said mold cavity; the improvement being an improved molding compound temperature controlling apparatus disposed between said mold and said pot plate comprising: A. a composite body defining at least one body opening in communication between said transfer pot and said mold cavity and a molding compound temperature controlling member mounted within said body opening; 1. said composite body comprising: a cooling plate disposed adjacent said pot plate; a heating plate disposed adjacent said mold; and a heat insulating layer disposed between said cooling plate and said heating plate; and 2.
Claim 3
Dependent Claim
134 words
said temperature controlling member comprising: an upper member mounted in heat transmitting exposure to said transfer pot and said cooling plate and defining an elongated runner passage extending substantially through said controlling member in communication between said transfer pot and said molding cavity; a lower member mounted with said upper member and in heat transmitting exposure to said mold and said heating plate; and heat insulating means defined by said lower member with said upper member and adapted to retard heat passage through said upper member along a lower portion of said runner passage. 2. The apparatus of claim 1 wherein said cooling plate is adapted to be maintained at a temperature suitable for proper flow of a molding compound as forced from said transfer pot through said runner passage into said mold cavity.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein said heating plate is adapted to be maintained at the curing temperature of said mold.
Claim 5
Dependent Claim
24 words
The apparatus of claim 1 wherein said cooling plate defines a flow passage path for effectively routing heat exchange fluid through said cooling plate.
Claim 6
Dependent Claim
24 words
The apparatus of claim 1 wherein said heating plate defines a flow passage path for effectively routing heat exchange fluid through said heating plate.
Claim 7
Dependent Claim
46 words
The apparatus of claim 1 wherein said runner passage is defined in the shape of a downwardly converging upper cone opening through a neck of reduced size into an upwardly converging lower cone with said lower portion of said runner passage being within said lower cone.
Claim 8
Dependent Claim
19 words
The apparatus of claim 6 wherein said upper cone is of substantially greater median diameter than said lower cone.
Claim 9
Dependent Claim
28 words
The apparatus of claim 1 wherein said temperature controlling member is provided of generally cylindrical shape with said heat insulating means being defined in a generally annular shape.
Claim 10
Dependent Claim
54 words
The apparatus of claim 1 wherein said heat insulating means, said upper member and said lower member are adapted to coact during the curing of a molding compound in said mold cavity to permit curing of said compound upwardly into said runner passage no further than within said lower portion of said runner passage.
Claim 11
Dependent Claim
31 words
The apparatus of claim 1 wherein said heat insulating means comprises an air cavity defined around said lower portion of said runner passage between said upper member and said lower member.
Claim 12
Dependent Claim
43 words
The apparatus of claim 1 wherein said composite body defines a plurality of said body openings in respective communication between said transfer pot and a plurality of said mold cavities with a respective said temperature control member mounted within each said body opening.
Claim 13
Dependent Claim
28 words
The apparatus of claim 9 wherein said temperature controlling member is provided of generally cylindrical shape with said heat insulating means being defined in a generally annular shape.
Claim 14
Dependent Claim
46 words
The apparatus of claim 12 wherein said runner passage is defined in the shape of a downwardly converging upper cone opening through a neck of reduced size into an upwardly converging lower cone with said lower portion of said runner passage being within said lower cone.
Claim 15
Dependent Claim
19 words
The apparatus of claim 13 wherein said upper cone is of substantially greater median diameter than said lower cone.
Claim 16
Dependent Claim
31 words
The apparatus of claim 9 wherein said heat insulating means comprises an air cavity defined around said lower portion of said runner passage between said upper member and said lower member.
Claim 17
Dependent Claim
39 words
The apparatus of claim 13 wherein said cooling plate is adapted to be maintained at a temperature suitable for proper flow of a molding compound as forced from said transfer pot through said runner passage into said mold cavity.
Claim 18
Dependent Claim
21 words
The apparatus of claim 13 wherein said heating plate is adapted to be maintained at the curing temperature of said mold.
Claim 19
Dependent Claim
43 words
The apparatus of claim 13 wherein said composite body defines a plurality of said body openings in respective communication between said transfer pot and a plurality of said mold cavities with a respective said temperature control member mounted within each said body opening.
Claim 20
Dependent Claim
53 words
The apparatus of claim 6 wherein said heat insulating means, said upper member and said lower member are adapted to coact during curing of a molding compound in said mold cavity to permit curing of said compound upwardly into said runner passage no further than within said lower portion of said runner passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |