Apparatus for rotational molding
US4292015A · kind A · utility
Inventor
Key dates
| Filing date | Mar 12, 1979 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Mar 12, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C41/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for the rotational molding of thin-walled articles. The method is comprised of the steps of introducing a predetermined amount of plastic material into a mold, rotating the mold about a first axis at a predetermined speed, while simultaneously rocking the mold through a selective arc about a second axis which is normal to the first axis, heating the mold for curing the plastic material during the rotation and rocking, and cooling the mold and plastic material whereby the plastic material is molded to form a thin-walled object in conformance with the interior surface of the mold. The rotational molding apparatus is comprised of a heat insulating housing comprising a bottom half and a top half which may be disassociated for access to the interior of the housing. The interior of the housing contains a first frame which may be rocked about a first axis and a second mold-carrying frame which is attached to the first frame and rotates about a second axis normal to the first axis. Motors mounted exterior of the housing and operably connected to each of the frames cause the rotation and rocking of the frames. A heat source introduces heated air to the interior of the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.