Patent US3762847A successfully refreshed from Google Patents.
US3762847A
Expired / Lapsed
US
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Apparatus for making a molded electrical structure
Assignee: General Electric Co
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Filing: 1971-09-15
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Granted: 1973-10-02
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Expires: 1991-09-15
Abstract
Abstract Apparatus and method for making a molded composite structure which comprises a core and coil assembly and a substantially rigid interstitial agglomerate mass of particulate material secured together and to the assembly by a hardened matrix, the mass forming a protective covering for at least part of the core and coil assembly. The apparatus includes a first mold part for accommodating at least part of the core and coil assembly, a second mold part, and mechanism for opening and closing the mold parts to selectively define a substantially closed cavity. The apparatus includes a molding composition passageway or gate communicating with the cavity. A filling tube communicates with the gate, and means are provided to rapidly force a molding composition under pressure into the closed cavity at a substantially constant, uniform rate and maintain pressure on the material within the cavity during hardening of the matrix portion of the structure. The mold parts are heated to harden the matrix portion of material within the closed cavity, while the gate region is cooled, as by circulating cooling water through coolant passages, to maintain the composition flowable and matrix former unhardened in the tube. Vents formed in the cavity provide the desirable result of reducing the occurrence of articles considered defective because of relative separation of molding composition constituents and incomplete mold cavity filling. Disclosed method includes subjecting a molding composition to a relatively low thermal state environment, and thereafter subjecting a mass of the composition to a relatively elevated thermal state environment while moving the material at a relatively high and substantially constant rate of speed into a closed mold cavity, holding the composition in the closed cavity until a characteristic temperature of at least one of the materials in the molding composition is reached within the closed cavity and thereafter opening the mold cavity, and then removing a structure from the cavity.
Inventors
- 👤 T Deuter
- 👤 D Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:18
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14639; B29C2045/1486; B29C2045/14868; B29C2045/14877; B29C2045/14893; Y; Y10; Y10S; Y10S425/00; Y10S425/228; Y10S425/812; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
493 words
Apparatus for making a molded electrical structure which comprises a bore defining stator core and coil assembly with at least a portion thereof at least partially embedded in a substantially rigid and solid interstitial mass of inert particulate material secured together and to at least a portion of the assembly by a hardened matrix forming material, the mass forming a protective covering for at least a part of the assembly and initially being a flowable molding composition, said apparatus comprising: a plurality of mold parts including first and second mold parts, the first mold part having at least one surface for establishing at least part of at least one substantially closed cavity region for molding at least a part of the interstitial mass; a second mold part having at least one surface for establishing at least part of the at least one substantially closed cavity region; means for effecting relative movement of said mold parts thereby to selectively establish the at least one substantially closed cavity region; means for supporting a core and coil assembly in the at least one substantially closed cavity region; a bore plug extending from at least one of the mold parts and disposed within the closed cavity region at least when the substantially closed cavity region is established; one of said mold parts having at least one discharge passage therein communicating at least with the at least one substantially closed cAvity region for admitting molding composition thereto; at least one transition passageway for admitting molding composition to the discharge passage; at least one filling tube in communication with the at least one transition passageway; means for venting the at least one substantially closed cavity region to thereby assist in complete filling of the at least one closed cavity region without separation of molding composition constituents when molding composition is forced thereinto means for rapidly forcing molding composition under pressure from the at least one filling tube through the at least one transition passageway and the at least one discharge passage into the at least one substantially closed cavity at a substantially constant and uniform rate preselected to at least assist in completely filling the at least one substantially closed cavity region with unseparated molding composition and for maintaining a pressure on molding composition in the at least one substantially closed cavity region during hardening of the composition into a substantially solid mass; means for heating at least one of said mold parts and said bore plug thereby to elevate the temperature associated with the substantially closed cavity region and to shorten the time required for molding composition within the substantially closed cavity region to harden into a substantially solid mass; and means for cooling the at least one transition passageway thereby to maintain the temperature of molding composition adjacent to the at least one transition passageway below a preselected hardening temperature and to inhibit transfer of heat from the mold parts to the at least one filling tube.
Claim 2
Dependent Claim
493 words
Apparatus for making a molded electrical structure which comprises a bore defining stator core and coil assembly with at least a portion thereof at least partially embedded in a substantially rigid and solid interstitial mass of inert particulate material secured together and to at least a portion of the assembly by a hardened matrix forming material, the mass forming a protective covering for at least a part of the assembly and initially being a flowable molding composition, said apparatus comprising: a plurality of mold parts including first and second mold parts, the first mold part having at least one surface for establishing at least part of at least one substantially closed cavity region for molding at least a part of the interstitial mass; a second mold part having at least one surface for establishing at least part of the at least one substantially closed cavity region; means for effecting relative movement of said mold parts thereby to selectively establish the at least one substantially closed cavity region; means for supporting a core and coil assembly in the at least one substantially closed cavity region; a bore plug extending from at least one of the mold parts and disposed within the closed cavity region at least when the substantially closed cavity region is established; one of said mold parts having at least one discharge passage therein communicating at least with the at least one substantially closed cAvity region for admitting molding composition thereto; at least one transition passageway for admitting molding composition to the discharge passage; at least one filling tube in communication with the at least one transition passageway; means for venting the at least one substantially closed cavity region to thereby assist in complete filling of the at least one closed cavity region without separation of molding composition constituents when molding composition is forced thereinto means for rapidly forcing molding composition under pressure from the at least one filling tube through the at least one transition passageway and the at least one discharge passage into the at least one substantially closed cavity at a substantially constant and uniform rate preselected to at least assist in completely filling the at least one substantially closed cavity region with unseparated molding composition and for maintaining a pressure on molding composition in the at least one substantially closed cavity region during hardening of the composition into a substantially solid mass; means for heating at least one of said mold parts and said bore plug thereby to elevate the temperature associated with the substantially closed cavity region and to shorten the time required for molding composition within the substantially closed cavity region to harden into a substantially solid mass; and means for cooling the at least one transition passageway thereby to maintain the temperature of molding composition adjacent to the at least one transition passageway below a preselected hardening temperature and to inhibit transfer of heat from the mold parts to the at least one filling tube.
Claim 3
Dependent Claim
55 words
The apparatus of claim 1 wherein said means for venting includes at least one air exhausting passage formed in a wall defining a side portion of the at least one substantially closed cavity region and at least one other air exhausting passage established along another wall of the at least one substantially closed cavity region.
Claim 4
Dependent Claim
52 words
The apparatus of claim 1 wherein the at least one filling tube has a first end communicating with the at least one transition passageway, and said means for cooling includes jacket means for circulating a liquid coolant in heat transfer relationship with the first end of the at least one filling tube.
Claim 5
Dependent Claim
58 words
The apparatus of claim 3 wherein said means for circulating a coolant includes a plate disposed at said first end of the at least one filling tube, the plate having coolant passages formed therein having the at least one transition passageway formed therein and having at least a part of the at least one discharge passage formed therein.
Claim 6
Dependent Claim
62 words
The apparatus of claim 1 wherein the core and coil assembly includes a pair of upstanding terminals connected to the coil portion thereof, at least one of the mold parts includes recess defining means for respectively snugly receiving core and coil assembly terminals when the mold parts are closed thereby to prevent damage to the terminals during closure of the mold parts.
Claim 7
Dependent Claim
22 words
The apparatus of claim 1 wherein said means for heating includes a heating element disposed in said at least one bore plug.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |