US3786543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing rotating joint member by casting
Assignee: Minebea Co Ltd
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Filing: 1972-04-26
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Granted: 1974-01-22
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Expires: 1992-04-26
Abstract
Abstract A spherical element whose external peripheral surface is coated with a thin heat resisting resin film and said spherical element is set into the inside of a metal mold provided with a molding chamber for casting a socket for embracing the spherical element, and then a molten metal is poured into the metal mold for forming the socket and is solidified to cast the socket that embraces the spherical element and this cast socket is removed from the metal mold and the heat resisting resin film remaining on the external peripheral surface of the spherical element is removed mechanically or chemically thereby forming a clearance that permits the free rotation of the spherical element with respect to the socket in the external peripheral surface of the spherical element and the inner surface of the socket.
Inventors
- 👤 S Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:21
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/12; F; F16; F16C; F16C11/00; F16C11/04; F16C11/06; F16C11/0614; F16C11/0685; F16C7/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49648; Y10T29/49657; Y10T29/49659; Y10T29/4981; Y10T29/49812; Y10T29/49826; Y10T29/4984; Y10T29/49845; Y10T29/49853; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A method of producing a rotatable joint member by casting, characterized by setting a preformed spherical element with a heat resistant resin film about its external peripheral surface into a metal mold provided with a molding chamber for forming a socket embracing the spherical element, thereafter pouring a molten metal into the molding chamber for forming the socket of the rotatable joint member, solidifying the poured metal to form a cast socket that embraces the spherical element, removing the cast socket from the metal mold, and removing the heat resistant resin film remaining between the external periphery of the spherical element and the inner surface of the socket to form a clearance permitting free rotation of the spherical element relative to the cast socket.
Claim 2
Independent Claim
124 words
A method of producing a rotatable joint member by casting, characterized by setting a preformed spherical element with a heat resistant resin film about its external peripheral surface into a metal mold provided with a molding chamber for forming a socket embracing the spherical element, thereafter pouring a molten metal into the molding chamber for forming the socket of the rotatable joint member, solidifying the poured metal to form a cast socket that embraces the spherical element, removing the cast socket from the metal mold, and removing the heat resistant resin film remaining between the external periphery of the spherical element and the inner surface of the socket to form a clearance permitting free rotation of the spherical element relative to the cast socket.
Claim 3
Dependent Claim
45 words
A method of producing a rotatable joint member as defined in claim 1, wherein the heat resisting resin film remaining on the external periphery of the spherical element after the casting is removed by the forced rotation of the spherical element in the cast socket.
Claim 4
Dependent Claim
29 words
A method of producing a rotatable joint member as defined in the claim 1, wherein the heat resisting resin film of the spherical element is formed of polytetrafluoroethylene resin.
Claim 5
Dependent Claim
34 words
A method of producing a rotatable joint member as defined in claim 1, wherein the heat resistant resin film comprises a coating of a thickness in the range from two microns to ten microns.
Claim 6
Independent Claim
127 words
A method of producing a rotatable joint member by casting, characterized by setting a preformed spherical element with a heat resistant resin flim about its external peripheral surface into a metal mold provided with a molding chamber for forming a socket embracing the spherical element, thereafter pouring a molten metal into the molding chamber for forming the socket of the rotatable joint member, solidifying the poured metal to form a cast socket that embraces the spherical element, removing the cast socket from the metal mold, and removing the heat resisting resin film of polytetrafluorethylene resin remaining between the external periphery of the spherical element and the inner surface of the socket to form a clearance permitting free rotation of the spherical element relative to the cast socket.
Claim 7
Independent Claim
127 words
A method of producing a rotatable joint member by casting, characterized by setting a preformed spherical element with a heat resistant resin flim about its external peripheral surface into a metal mold provided with a molding chamber for forming a socket embracing the spherical element, thereafter pouring a molten metal into the molding chamber for forming the socket of the rotatable joint member, solidifying the poured metal to form a cast socket that embraces the spherical element, removing the cast socket from the metal mold, and removing the heat resisting resin film of polytetrafluorethylene resin remaining between the external periphery of the spherical element and the inner surface of the socket to form a clearance permitting free rotation of the spherical element relative to the cast socket.
References Cited (Backward Citations)
US2252351A
Cited
US2462138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |