Patent US1982650A successfully refreshed from Google Patents.
US3784338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible sector core for curing belts
Assignee: Industrie Pirelli SpA
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Filing: 1971-04-09
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Granted: 1974-01-08
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Expires: 1991-04-09
Abstract
Abstract The invention relates to an expansible type core for a belt curing mold. A plurality of complementary sectors are interfitted to form a cylinder and, in addition, means are provided for interlocking the sectors in expanded position against either axial or radial displacement relative to each other. Further, the sectors are expansible symmetrically relative to the core axis.
Inventors
- 👤 A Previati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:04
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/485; B29D; B29D29/00; B29D29/10; Y; Y10; Y10S; Y10S425/00; Y10S425/818
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
An expansible and collapsible sector mold for curing driving belts comprising two pairs of sectors which form the mold core in their entirety; a pair of structural shapes having a saw-toothed projection and rigidly connected to the inside of a sector pair, and a plurality of small pegs carried by the saw-toothed projection; a longitudinal groove present in the inside of the sectors of the other pair; a sliding element having a plurality of projections aligned on two longitudinal lines and having a shape complementary to that of said saw-toothed structural shapes, said sliding element being provided with a plurality of slots, oblique with respect to the axis of the sliding element and intended to encase said small pegs, and with a pair of continuous longitudinal ribs capable of engaging with the continuous longitudinal grooves of said other pair, when the core is in expanded condition, whereby each sector of the core in expanded condition is internally supported along a continuous line.
Claim 2
Dependent Claim
162 words
An expansible and collapsible sector mold for curing driving belts comprising two pairs of sectors which form the mold core in their entirety; a pair of structural shapes having a saw-toothed projection and rigidly connected to the inside of a sector pair, and a plurality of small pegs carried by the saw-toothed projection; a longitudinal groove present in the inside of the sectors of the other pair; a sliding element having a plurality of projections aligned on two longitudinal lines and having a shape complementary to that of said saw-toothed structural shapes, said sliding element being provided with a plurality of slots, oblique with respect to the axis of the sliding element and intended to encase said small pegs, and with a pair of continuous longitudinal ribs capable of engaging with the continuous longitudinal grooves of said other pair, when the core is in expanded condition, whereby each sector of the core in expanded condition is internally supported along a continuous line.
Claim 3
Dependent Claim
51 words
The sector mold of claim 1 wherein said sliding element comprises a cross-shaped assembly including mutually perpendicular pairs of legs, one pair of the opposed legs including said slots while the ends of the thereto perpendicular pair of opposed legs slidingly engage respective central grooves in the other pair of sectors.
Claim 4
Dependent Claim
33 words
The sector mold of claim 2 wherein said cross-shaped assembly comprises a pair of T-shaped members fixedly joined to each other in back to back relationship with a space between their respective backs.
Claim 5
Dependent Claim
32 words
The sector mold of claim 1 further including respective flange means at each end of said sectors for lockingly engaging said sectors against any axial or radial movement relative to each other.
Claim 6
Dependent Claim
20 words
The sector mold of claim 4 wherein said flange means and the ends of said sectors include bayonet-type locking means.
Claim 7
Dependent Claim
109 words
The sector mold of claim 5, wherein the first of said flange means includes a said locking means for only one pair of said sectors while the second of said flange means includes a said locking means for all said pairs of sectors, the locking means of said first flange means comprising an abutment means axially lockingly engageable with a pair of said sectors only pursuant to radial movement of these sectors relative to said abutment means, while the locking means of said second flange means comprises a slot and projection combination which effects locking engagement through relative axial and rotative movement of the parts to be locked together.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |