Method and apparatus for forming hollow plastic articles
Abstract
Abstract A method and apparatus for vacuum forming hollow plastic article from heat- fusible sheets of organic plastic materials. A pair of open frames are mounted on rails for transfer in close parallel relationship, each frame having clamps for holding at each end thereof a sheet of plastic material. Ovens into which the rails extend are located in spaced relation, and midway between the ovens is a forming station through which the rails pass and wherein sectional molds are provided which can close on two parallel sheets supported by the open frames. The frames are arranged so that two sheets, one in each oven, can be heated simultaneously while two other sheets are being formed at the same time in the sectional molds. Transfer means shuttle the frames between the ovens and the forming station.
Inventors
- 👤 A Brodhead
Bibliographic Details
Claims Analysis
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |