US4243628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of plastic insulators with screens for indoor and outdoor use
Assignee: Siemens AG
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Filing: 1978-09-18
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Granted: 1981-01-06
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Expires: 1998-09-18
Abstract
Abstract Plastic insulators with protective screens for indoor and outdoor use, especially support and suspension insulators are manufactured by injection molding or transfer molding, using granulated or paste-like molding compounds (rigid or flexible adjustment) on the basis of unsaturated polyester or epoxy resins, heterocyclic polyurethane resins, polypropylene (PP), ethylene-propylene monomer rubber (EPM), ethylene-propylene-diene monomer rubber (EPDM), synthetic rubber, silicone rubber and others. The fabrication can be carried out through one-part or multiple-part injection.
Inventors
- 👤 Georg Herold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:24
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/72; H; H01; H01B; H01B19/00; B29C45/00; B29L; B29L2031/00; B29L2031/34; B29L2031/3412; Y; Y10; Y10S; Y10S264/00; Y10S264/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A method for manufacturing plastic insulators with screens for indoor and outdoor use, comprising providing a first-fabricated screen part within a mold and injection-molding or transfer molding onto said part one or more injection-moldable, electrically high quality, hydrophobic, leakage-current-resistant, erosion and temperature resistant molding compounds having a high notch impact strength, said injection molding comprising plasticizing said molding compound under heat and injecting said compound into the mold under pressure, said molding compound comprising a thermosetting plastic, thermoplastic or elastomeric material comprising from 0 to 60% by weight thereof of filler materials.
Claim 2
Independent Claim
92 words
A method for manufacturing plastic insulators with screens for indoor and outdoor use, comprising providing a first-fabricated screen part within a mold and injection-molding or transfer molding onto said part one or more injection-moldable, electrically high quality, hydrophobic, leakage-current-resistant, erosion and temperature resistant molding compounds having a high notch impact strength, said injection molding comprising plasticizing said molding compound under heat and injecting said compound into the mold under pressure, said molding compound comprising a thermosetting plastic, thermoplastic or elastomeric material comprising from 0 to 60% by weight thereof of filler materials.
Claim 3
Dependent Claim
18 words
The method according to claim 1 wherein said molding compound is highly elastic in the ± temperature range.
Claim 4
Dependent Claim
25 words
The method according to claim 1 wherein said molding compounds further comprise from about 30 to about 60% by weight of finely distributed filler materials.
Claim 5
Dependent Claim
30 words
The method according to claim 1 wherein said molding compounds comprise a member selected from the group consisting of aromatic, cycloaliphatic and heterocyclic epoxy resins, polyurethane resins and polyester resins.
Claim 6
Dependent Claim
26 words
The method according to claim 1 wherein said molding compound comprises a member selected from the group consisting of rubber-modified polyolefins, synthetic rubbers and silicone rubbers.
Claim 7
Dependent Claim
26 words
The method according to claim 5 wherein said rubber-modified polyolefin is selected from the group consisting of ethylene-propylene monomer rubber, ethylene-propylene-diene monomer rubber, and mixtures thereof.
Claim 8
Dependent Claim
21 words
The method according to claim 1 wherein said molding compound is plasticized under heat and injected under pressure into a mold.
Claim 9
Dependent Claim
41 words
The method according to claim 7 wherein said molding compound is plasticized at a temperature of from about 150° C. to about 280° C. and injected under pressure into a mold with a mold temperature of about 100° C. or less.
Claim 10
Dependent Claim
40 words
The method according to claim 8 wherein said molding compound is plasticized at a temperature of from about 100° C. or less and is injected under pressure into a mold with a mold temperature of at least about 140° C.
Claim 11
Dependent Claim
33 words
The method according to claim 3 wherein said filled molding composition is of low viscosity of up to about 50,000 cp and is processed at a pressure of about 50 bar or less.
Claim 12
Dependent Claim
15 words
The method according to claim 1 wherein plastic insulator is a single or multiple-piece insulator.
References Cited (Backward Citations)
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |