US3833333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press construction
Assignee: Individual
•
Filing: 1972-11-06
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Granted: 1974-09-03
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Expires: 1992-11-06
Abstract
Abstract A molding press construction wherein a pair of die-holding platens are movable toward and away from each other by a primary mover of relatively large displacement and lesser force to a locked position, wherein a secondary mover of relatively small displacement and large force maintains the platens together in molding position.
Inventors
- 👤 G Britten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:22
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/64; B29C45/67; B29C45/6707; B30; B30B; B30B1/00; B30B1/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
220 words
A molding press construction comprising a first platen for holding a die or the like, a carrier shiftably mobable toward and away from said first platen, locating means for releasably positively locating said carrier at a selected position relative to said first platen, a second platen for holding a complementary die or the like and spacedly interposed between said first platen and carrier, mounting means mounting said second platen for movement together with said carrier and resiliently yieldable urgence toward said carrier, primary motive meaNs of lesser force for moving said carrier and first platen toward and away from each other into and out of said selected position, and secondary motive means of greater force for urging said second platen away from said carrier toward said first platen, for holding said platens toward each other during molding, said secondary motive means comprising a sealed chamber of metallic material defined by a substantially rigid peripheral side wall, a pair of end walls, at least one of said end walls being relatively flexible, and having fluid passage means to the interior of said sealed chamber, whereby under internal pressure said chamber is expansible endwise upon flexure of at least one of said end walls and contractile endwise upon return of the end walls to their unflexed condition upon reduction of internal pressure.
Claim 2
Dependent Claim
220 words
A molding press construction comprising a first platen for holding a die or the like, a carrier shiftably mobable toward and away from said first platen, locating means for releasably positively locating said carrier at a selected position relative to said first platen, a second platen for holding a complementary die or the like and spacedly interposed between said first platen and carrier, mounting means mounting said second platen for movement together with said carrier and resiliently yieldable urgence toward said carrier, primary motive meaNs of lesser force for moving said carrier and first platen toward and away from each other into and out of said selected position, and secondary motive means of greater force for urging said second platen away from said carrier toward said first platen, for holding said platens toward each other during molding, said secondary motive means comprising a sealed chamber of metallic material defined by a substantially rigid peripheral side wall, a pair of end walls, at least one of said end walls being relatively flexible, and having fluid passage means to the interior of said sealed chamber, whereby under internal pressure said chamber is expansible endwise upon flexure of at least one of said end walls and contractile endwise upon return of the end walls to their unflexed condition upon reduction of internal pressure.
Claim 3
Dependent Claim
47 words
A molding press construction according to claim 1, said primary motive force being of relatively great displacement for displacing said carrier from a retracted position toward said first platen, and said secondary motive force being of less displacement for maintaining said platens toward each other during molding.
Claim 4
Dependent Claim
34 words
A molding press construction according to claim 1, said mounting means comprising a frame, said first platen being fixed to said frame, and said carrier being mounted for said shifting movement on said frame.
Claim 5
Dependent Claim
30 words
A molding press construction according to claim 3, said locating means comprising latch means operatively associated with said frame and carrier for positively locating the latter relative to the former.
Claim 6
Dependent Claim
27 words
A molding press construction according to claim 1, said secondary motive means being interposed between said carrier and said second platen for opposing said resiliently yieldable urgence.
Claim 7
Dependent Claim
28 words
A molding press according to claim 5, said secondary motive means comprising an expansile and contractile chamber of relatively large effective cross section, for relatively great resultant force.
Claim 8
Dependent Claim
29 words
A molding press construction according to claim 6, said primary motive means comprising an expansile and contractile chamber of relatively small effective cross section, for relatively great resultant displacement.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |