Apparatus for molding skylights
US4447200A · kind A · utility
5Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Nov 12, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/048
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for molding a polycarbonate plastic sheet into a skylight dome and the like. A heated clamp frame is provided for clamping the edges of a plastic sheet and preheating the edges to about 250.degree. F. Ovens heat the clamped sheet to about 300.degree. F. to soften the plastic for forming by a pair of co-acting peripheral heated molds to form steps and pushes in the periphery of the softened sheet immediately adjacent to the clamp frames. A vacuum is then drawn over the center portion of the plastic sheet to free form a dome.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.