US3682576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segmented mold
Assignee: Eagle Picher Industries Inc
•
Filing: 1971-02-10
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Granted: 1972-08-08
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Expires: 1991-02-10
Abstract
Abstract Mold for vulcanizing radial tires and having fixed and movable sidewall matrices with radially movable tread forming matrices. Tread segments are carried by an annular piston housed within a chamber in the mold body. The chamber is closed by a member guiding the piston and sealing the mold cavity when the press is closed. Fluid pressure introduced into the chamber actuates the piston for selective radial movement of the tread forming matrices.
Inventors
- 👤 Werner L Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:47
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0606; B29D30/0629
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A mold for use with a press having a cross beam, carrying a mold body member, and a mold support assembly, said mold having a cavity for tire vulcanization defined by opposed fixed and movable annular sidewall matrices and a segmented tread forming matrix movable relative the sidewall matrices, the movable sidewall matrix being carried on the mold body member, the fixed sidewall matrix being carried on the mold support assembly, wherein the segments of the tread forming matrix are carried on the radially inner face of an annular piston housed within a chamber in the mold body member, the piston being selectively actuated by fluid pressure introduced into the chamber for radial movement of the segments.
Claim 2
Dependent Claim
117 words
A mold for use with a press having a cross beam, carrying a mold body member, and a mold support assembly, said mold having a cavity for tire vulcanization defined by opposed fixed and movable annular sidewall matrices and a segmented tread forming matrix movable relative the sidewall matrices, the movable sidewall matrix being carried on the mold body member, the fixed sidewall matrix being carried on the mold support assembly, wherein the segments of the tread forming matrix are carried on the radially inner face of an annular piston housed within a chamber in the mold body member, the piston being selectively actuated by fluid pressure introduced into the chamber for radial movement of the segments.
Claim 3
Dependent Claim
40 words
A mold according to claim 1, wherein the end of the chamber adjacent the mold support assembly is formed by a member both guiding movement of the piston and interfitting with the mold support assembly when the press is closed.
Claim 4
Dependent Claim
33 words
A mold according to claim 1, wherein each segment of the tread forming matrix has attached thereto guide means slidably received in a corresponding slot in the radially inner face of the piston.
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |