Apparatus for resetting the corner of deep-drawn laminated articles
Abstract
Abstract A sheet of metal having a skin of plastic bonded thereto is deep drawn to form a box having an external plastic skin. Then laminating bonds are reset where delamination has occured, usually at the corners, by heating locally from the inside of the box while concurrently applying pressure to the skin. Apparatus for performing this method comprises a core having induction heating coils at the corners, over which the box fits, and a concave boot which fits over the box and has a fluid pressure actuated bladder to press against the corners of the box during the heating step. An automatic control system provides for repetitive operation in a production line wherein a series of boxes are connected by a web and treated one after the other.
Inventors
- 👤 Ezra C Polling
- 👤 Charles E Botsford
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |