Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1973-10-03
1976-06-22
Rzucidlo, Eugene C.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
43 45, 264278, 264310, 264311, 116 19, B29B 300
Patent
active
039652343
ABSTRACT:
A method of making a seamless, hollow, spherical fishing buoy of thermoset resin, preferably cross-linkable polyolefin, by rotationally molding the same without vent holes or openings in the buoy. A 3-plane, rigid, corner cube radar reflector is mounted inside the spherical buoy, and is oriented to provide maximum return of a radar signal from anywhere on or above the horizon. The reflector is centered within the mold cavity by six spring-loaded standoffs, which are attached to the corners of the reflector. The standoffs are molded of the same resin as the buoy, but are only partially cross-linked. During molding cycle, the cross-linkable resin molding powder melts and spreads uniformly over the inside surface of the mold, at the same time cross-linking. The ends of the partially cross-linked standoffs in contact with the hot mold melt and become part of the plastic shell, and also continue cross-linking with the latter. The springs allow the standoffs to follow the mold as the latter expands and contracts, while keeping the reflector accurately centered in the cavity.
REFERENCES:
patent: 2888675 (1963-08-01), Pratt et al.
patent: 3020669 (1962-02-01), Beyer-Olsen et al.
patent: 3081493 (1963-03-01), Beyer-Olsen et al.
patent: 3151196 (1964-09-01), Tipton
patent: 3344468 (1967-10-01), Moslo
patent: 3507950 (1970-04-01), Barnett et al.
patent: 3634578 (1972-01-01), Suzuki
patent: 3788792 (1974-01-01), Suzuki
Kidder Herbert E.
Rzucidlo Eugene C.
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