US3882220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding utilizing meltable core
Assignee: Ryder International Corp
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Filing: 1973-11-02
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Granted: 1975-05-06
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Expires: 1993-11-02
Abstract
Abstract A method of molding a hollow article with a member therein includes the steps of molding a meltable material about the member, then molding a higher melting point material about a core made up of the composite member and meltable material, and then melting out the meltable material to leave the member movable and permanently enclosed within the hollow article that is formed by the molding of the higher melting point material. The method may be used to make a variety of products, such as valve assemblies, trinkets etc.
Inventors
- 👤 Francis E Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:07
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/52; B29K; B29K2059/00; B29K2069/00; B29L; B29L2031/00; B29L2031/748; B29L2031/7506; Y; Y10; Y10S; Y10S264/00; Y10S264/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A METHOD OF MOLDING AN ARTICLE INCLUDING A HOUSING AND A SPRING BIASED ELEMENT HELD CAPTIVE WITHIN SAID HOUSING, SAID METHOD COMPRISING THE STEPS OF: PROVIDING A FIRST MOLD HAVING A CAVITY SHAPED TO THE DESIRED INNER CONFIGURATION OF THE HOUSING; POSITIONING A BIASING MEMBER AND AN ELEMENT WITHIN SAID FIRST MOLD CAVITY; DEPRESSING SAID ELEMENT AGAINST SAID BIASING MEMBER TO DISENGAGE SAID ELEMENT FROM ANY RESTRICTIONS IN SAID FIRST MOLD CAVITY; MOLDING A FIRST MATERIAL ABOUT SAID ELEMENT AND BIASING MEMBER WHILE MAINTAINING SAID ELEMENT DEPRESSED TO PROVIDE A CASTING INCLUDING SAID ELEMENT AND SAID BIASING MEMBER IN THE DEPRESSED CONDITION; MOLDING A SECOND MATERIAL ABOUT THE CASTING, SAID SECOND MATERIAL HAVING A HIGHER MELTING POINT THAN SAID FIRST MATERIAL; AND MELTING SAID
Claim 2
Independent Claim
124 words
A METHOD OF MOLDING AN ARTICLE INCLUDING A HOUSING AND A SPRING BIASED ELEMENT HELD CAPTIVE WITHIN SAID HOUSING, SAID METHOD COMPRISING THE STEPS OF: PROVIDING A FIRST MOLD HAVING A CAVITY SHAPED TO THE DESIRED INNER CONFIGURATION OF THE HOUSING; POSITIONING A BIASING MEMBER AND AN ELEMENT WITHIN SAID FIRST MOLD CAVITY; DEPRESSING SAID ELEMENT AGAINST SAID BIASING MEMBER TO DISENGAGE SAID ELEMENT FROM ANY RESTRICTIONS IN SAID FIRST MOLD CAVITY; MOLDING A FIRST MATERIAL ABOUT SAID ELEMENT AND BIASING MEMBER WHILE MAINTAINING SAID ELEMENT DEPRESSED TO PROVIDE A CASTING INCLUDING SAID ELEMENT AND SAID BIASING MEMBER IN THE DEPRESSED CONDITION; MOLDING A SECOND MATERIAL ABOUT THE CASTING, SAID SECOND MATERIAL HAVING A HIGHER MELTING POINT THAN SAID FIRST MATERIAL; AND MELTING SAID
Claim 3
Dependent Claim
68 words
A method as defined in claim 1, wherein said step of molding a second material about the casting includes the steps of: providing a second mold having a second cavity corresponding in shape to the desired outer configuration of the housing; positioning said casting in said second mold cavity to function as a core element thereof, and introducing said second molding material into said cavity about said casting.
Claim 4
Dependent Claim
143 words
A method according to claim 1 further including steps of: selecting said first material such that it has characteristics and mass as to constitute it a heat sink to prevent melting thereof during molding of said second material, whereby molding of said second material about said first casting produces a second, component casting comprised of said first and second materials, said element and said biasing member; and subjecting said second, component casting to a temperature that is less than the melting point of said second material, said element and said biasing member, but greater than the melting point of said first material so that said first material is liquefied while said second material, said element and said biasing member remains solidified; and removing said liquefied first material from the interior of said second solidified material thereby freeing said element and said spring member.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein said article is a valve assembly, and said element is a valve member designed to seat in sealing engagement against a seating surface provided on said housing.
Claim 6
Dependent Claim
85 words
A method as defined in claim 1, wherein said step of depressing said element against the action of said biasing member includes the step of: introducing a pin element into said first mold cavity to engage said element and depress said element axially away from any restricting surface on said first cavity, against the force of said biasing member; and said step of molding a first material includes the step of maintaining said pin in position and molding said first material about said pin element.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |