US3640653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire curing press
Assignee: NRM Corp
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Filing: 1970-06-29
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Granted: 1972-02-08
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Expires: 1990-06-29
Abstract
Abstract Upstanding bladder-type tire curing press having a fluid pressure actuated post engaged with the closed upper end of the bladder and having post and bladder pressure controls to facilitate the tire carcass loading, shaping, curing, and unloading operations. The press also has a stationarily mounted stripper with respect to which the cured tire is raised thus to strip the tire from the movable toe ring of the top mold section for discharge onto an unloading conveyor beneath the stripper.
Inventors
- 👤 Nicholas M Laenen
- 👤 James M Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:48
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0649; B29D30/0603; B29D30/0645
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
In a tire curing press wherein an uncured tire carcass positioned around a radially expansible bladder is cured by introducing curing medium into said bladder while the carcass is confined between complemental top and bottom mold sections of which the former is vertically movable away from the latter and thence laterally for unloading the cured tire from said bladder and for clearing said bladder for overhead loading of a succeeding uncured tire carcass from a downwardly moving loader; and wherein said bladder has a closed upper end engageable within said top mold section, an open lower end secured to the inner periphery of said bottom molD section, and a radially expansible sidewall engageable with the inside wall of the carcass; the improvement which comprises a fluid pressure actuated post means extending upwardly through the open end of said bladder to engage the closed upper end thereof; and actuating means to actuate said post means with pressures of different magnitudes, a higher pressure being employed during unloading to axially distend and radially contract said bladder as the upper end thereof moves in contact within the upwardly moving top mold section than during loading as the upper end of the axially distended bladder is depressed by the loader.
Claim 2
Dependent Claim
206 words
In a tire curing press wherein an uncured tire carcass positioned around a radially expansible bladder is cured by introducing curing medium into said bladder while the carcass is confined between complemental top and bottom mold sections of which the former is vertically movable away from the latter and thence laterally for unloading the cured tire from said bladder and for clearing said bladder for overhead loading of a succeeding uncured tire carcass from a downwardly moving loader; and wherein said bladder has a closed upper end engageable within said top mold section, an open lower end secured to the inner periphery of said bottom molD section, and a radially expansible sidewall engageable with the inside wall of the carcass; the improvement which comprises a fluid pressure actuated post means extending upwardly through the open end of said bladder to engage the closed upper end thereof; and actuating means to actuate said post means with pressures of different magnitudes, a higher pressure being employed during unloading to axially distend and radially contract said bladder as the upper end thereof moves in contact within the upwardly moving top mold section than during loading as the upper end of the axially distended bladder is depressed by the loader.
Claim 3
Dependent Claim
25 words
The press of claim 1 wherein said actuating means comprises valve means operative selectively to conduct such higher or lower pressure to said post means.
Claim 4
Dependent Claim
36 words
The press of claim 1 wherein said actuating means comprises a solenoid operated valve means operative selectively to conduct such higher or lower pressure to said post means upon energization or deenergization of said valve means.
Claim 5
Dependent Claim
47 words
The press of claim 1 wherein means are provided to drain curing medium from said bladder and to apply negative pressure within said bladder as said bladder is axially distended by such higher pressure actuation of said post means thus to facilitate radial contraction of said bladder.
Claim 6
Dependent Claim
15 words
The press of claim 4 wherein said means comprises a drain valve and an ejector.
Claim 7
Dependent Claim
45 words
The press of claim 1 wherein said loader, upon depression of said bladder to mold level, actuates preinflation means to radially expand said bladder into contact within said bladder to expel air from between said bladder and the inside wall of the uncured tire carcass.
Claim 8
Dependent Claim
55 words
The press of claim 6 wherein means are provided to decrease the pressure within said bladder to a low holding pressure following preinflation, whereupon said loader is withdrawn upwardly preparatory to movement of said top mold section downwardly to engage the top bead of the uncured tire carcass and the upper end of said bladder.
Claim 9
Dependent Claim
120 words
The press of claim 1 wherein said top mold section has chuck means and ejector means operative respectively to releasably engage a cured tire to lift and laterally shift it during the upward and lateral movements of said top mold section, and to eject the cured tire downwardly out of said top mold section; and wherein said press has a stationary stripper means disposed between said top mold section and the ejected cured tire whereby, upon release of said chuck means therefrom and upon upward movement of said ejector means to engage the tire with said stripper means, the cured tire is stripped from said ejector means for dropping by gravity laterally of said bottom mold section and said bladder.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |