Plastic article or earthenware shaping or treating: apparatus – Including ventilating type hood or chamber encasing a...
Patent
1979-03-12
1981-09-29
Derrington, James H.
Plastic article or earthenware shaping or treating: apparatus
Including ventilating type hood or chamber encasing a...
425162, 425429, 425430, B29C 504
Patent
active
042920159
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 housing for purposes of curing plastic material held in a mold mounted in the apparatus.
REFERENCES:
patent: 2624072 (1953-01-01), Delacoste et al.
patent: 2659107 (1953-11-01), DeBell
patent: 3172160 (1965-03-01), Woodhouse
patent: 3202745 (1965-08-01), Ringdal
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