Patent US2160831A successfully refreshed from Google Patents.
US3685784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection mold wherein moveable cavity portions act to close the mold gates and further compress the mold material
Assignee: Motorola Solutions Inc
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Filing: 1969-11-19
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Granted: 1972-08-22
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Expires: 1989-11-19
Abstract
Abstract A method of molding and a mold are provided for encapsulating devices such as axial lead cylindrical electrical devices in which two separable portions of the mold closely embrace the axial leads near the axial ends of the mold cavity and one of the mold portions includes piston-like parts, one for each molding cavity, which moves between at least two positions. In one position of a piston-like part of the mold, and mold cavity is open to receive encapsulating fluid and in the other position of the part the mold cavity is completely closed. In a modification, the piston-like parts are each shaped and positioned to form parts of adjacent molding cavities. The molding process involves supplying encapsulating fluid to the several cavities by applying pressure to the whole body of fluid and applying higher pressure to the fluid in each molding cavity.
Inventors
- 👤 Keith Gordon Spanjer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:49
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C45/14; Y; Y10; Y10S; Y10S425/00; Y10S425/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
230 words
A mold comprising an upper mold portion having a cavity of the shape of a portion of an article to be molded and a flat surface, a lower mold portion having spaced parallelly extending flat surfaces adapted to contact said flat surface of said upper mold surface, said lower mold portions also including spaced fixed bridge portions, piston-like moveable parts positioned between said fixed portions and between said parallel flat surfaces and moveable in directions perpendicular to said parallelly extending flat surfaces, said piston-like part being shaped to fit another portion of an article to be molded and an end of said piston-like portion having a flat surface adapted to contact said flat surface of said upper mold portions, said flat surface of said piston-like part in one of its positions being spaced from said flat surface of said upper mold portion for providing a passage for molding fluid into said cavity and in another position thereof being in contact with said flat surface of said upper mold portion for preventing passage of fluid to and from said cavity, said shaped portion of said piston-like part in said other position forming a continuation of the surface of a molding cavity, and said bridge portions each being shaped to fit an article and said piston-like portion being shaped to fit two articles, one on each side of said flat end portions.
Claim 2
Dependent Claim
230 words
A mold comprising an upper mold portion having a cavity of the shape of a portion of an article to be molded and a flat surface, a lower mold portion having spaced parallelly extending flat surfaces adapted to contact said flat surface of said upper mold surface, said lower mold portions also including spaced fixed bridge portions, piston-like moveable parts positioned between said fixed portions and between said parallel flat surfaces and moveable in directions perpendicular to said parallelly extending flat surfaces, said piston-like part being shaped to fit another portion of an article to be molded and an end of said piston-like portion having a flat surface adapted to contact said flat surface of said upper mold portions, said flat surface of said piston-like part in one of its positions being spaced from said flat surface of said upper mold portion for providing a passage for molding fluid into said cavity and in another position thereof being in contact with said flat surface of said upper mold portion for preventing passage of fluid to and from said cavity, said shaped portion of said piston-like part in said other position forming a continuation of the surface of a molding cavity, and said bridge portions each being shaped to fit an article and said piston-like portion being shaped to fit two articles, one on each side of said flat end portions.
Claim 3
Dependent Claim
299 words
A mold comprising an upper mold portion having a cavity of the shape of a portion of an article to be molded and a flat surface, a lower mold portion having spaced parallelly extending flat surfaces adapted to contact said flat surface of said upper mold surface, said lower mold portions also including spaced fixed bridge portions, piston-like moveable parts positioned between said fixed portions and between said parallel flat surfaces and moveable in directions perpendicular to said parallelly extending flat surfaces, said piston-like part being shaped to fit another portion of an article to be molded and an end of said piston-like portion having a flat surface adapted to contact said flat surface of said upper mold portions, said flat surface of said piston-like part in one of its positions being spaced from said flat surface of said upper mold portion for providing a passage for molding fluid into said cavity and in another position thereof being in contact with said flat surfaCe of said upper mold portion for preventing passage of fluid to and from said cavity, said shaped portion of said piston-like part in said other position forming a continuation of the surface of a molding cavity, the ends of said fixed portions being flat and lower than said spaced parallel flat surfaces, an end of said moveable piston-like part having a cavity therein of the shape of another portion of the article to be molded and a flat surface which is parallel with said lower flat surfaces, and the flat surface of said piston-like part being adapted in one position thereof to contact the surface of said upper portion and in another position thereof to form with said surface of said upper portion and the surface of said fixed portions a passageway for molding fluid.
Claim 4
Dependent Claim
299 words
A mold comprising an upper mold portion having a cavity of the shape of a portion of an article to be molded and a flat surface, a lower mold portion having spaced parallelly extending flat surfaces adapted to contact said flat surface of said upper mold surface, said lower mold portions also including spaced fixed bridge portions, piston-like moveable parts positioned between said fixed portions and between said parallel flat surfaces and moveable in directions perpendicular to said parallelly extending flat surfaces, said piston-like part being shaped to fit another portion of an article to be molded and an end of said piston-like portion having a flat surface adapted to contact said flat surface of said upper mold portions, said flat surface of said piston-like part in one of its positions being spaced from said flat surface of said upper mold portion for providing a passage for molding fluid into said cavity and in another position thereof being in contact with said flat surfaCe of said upper mold portion for preventing passage of fluid to and from said cavity, said shaped portion of said piston-like part in said other position forming a continuation of the surface of a molding cavity, the ends of said fixed portions being flat and lower than said spaced parallel flat surfaces, an end of said moveable piston-like part having a cavity therein of the shape of another portion of the article to be molded and a flat surface which is parallel with said lower flat surfaces, and the flat surface of said piston-like part being adapted in one position thereof to contact the surface of said upper portion and in another position thereof to form with said surface of said upper portion and the surface of said fixed portions a passageway for molding fluid.
Claim 5
Dependent Claim
32 words
The invention of claim 1 in which said cavities are each semi-cylindrical and in which said parallelly extending surfaces of said lower portion extend perpendicular to the axis of said semi-cylindrical cavities.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |