Apparatus for making plastic skylights
US4278414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Feb 16, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/048
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for making skylights from thin polymer sheets. Heated clamp frames are provided for clamping the perimeter of a thin polymer sheet and preheating the perimeter thereof to a preselected first temperature. An oven is provided for further heating the preheated perimeter and for heating the center portion of the polymer sheet to a selected second temperature greater than the first temperature to soften the polymer for forming. Upper and lower perimeter platens are provided having a plurality of stepped edges therein which are clamped onto the softened polymer sheet to thereby form a plurality of steps within the perimeter of the polymer sheet. A vacuum forming chamber is provided for forming a dome in the center portion of the polymer sheet above the stepped portion thereof. A push member may also be provided adjacent the upper platen for forming a sharp rise or push around the perimeter of the dome and between the steps and the dome.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.