Thermoforming apparatus
Abstract
Abstract THE APPARATUS INCLUDES FRAME STRUCTURE PROVIDING A PLURALITY OF ANGULARLY SPACED STATIONS RADIALLY DISPOSED WITH RESPECT TO THE RETRACTED POSITION OF A PAIR OF HEATING ELEMENTS RCIPROCABLE BETWEEN SUCH RETRACTED POSITION AND EXTENDED POSITIONS AT ONE OR ANOTHER OF SUCH STATIONS SO AS TO HEAT A SHEET OF MATERIAL LOCATED THEREAT CONCURRENTLY FROM THE OPPOSITE SIDES THEREOF. EACH OF THE FORMING STATION IS EQUIPPED WITH CLAMPING MECHANISM SELECTIVELY MOVABLE BETWEEN OPEN AND CLOSED POSITIONS TO ENGAGE A SHEET OF MATERIAL AT THE STATION ALONG ITS PERIMETRIC EDGE PORTIONS AND CLAMP THE SHEET IN A GENERALLY HORIZONTAL ORIENTATION. EACH OF THE FORMING STATIONS IS PROVIDED WITH PLATEN STRUCTURE COMPRISING MALE AND FEMALE PLATENS COOPERATIVE WITH A HEATED SHEET OF MATERIAL TO DEFORM THE SAME MECHANICALLY TOWARD ITS FINAL CONFIGURATION, AND EACH OF THE FEMALE PLATENS IS EQUIPPED WITH MEANS FOR REDUCING THE PRESSURE THEREWITHIN TO ENABLE THE SHEET MATERIAL TO BE DEFORMED BY A PRESSURE DIFFERENTIAL THEREACROSS INTO THE FINAL CONFIGURATION INTENDED THEREFOR.
Inventors
- 👤 Robert A D Schwartz
- 👤 Barry Dep
- 👤 Robert L Hall
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |