Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1976-01-22
1977-04-19
Blix, Trygve M.
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
9311, 9329, 264DIG4, D34 43, B63C 910
Patent
active
040179273
ABSTRACT:
This invention relates to a ring buoy (life preserver) consisting of a toroid or doughnut-shaped ring of a plastic foam, preferably but not necessarily of polystyrene foam, provided with an integral tough, wear-resistant and weather-resistant outer film of flexible strong material and having within the buoy near the outer circumference thereof within the material a continuous ring of strong, rigid material as iron, steel or other material having desirable weight characteristics. At spaced intervals indented in the outer edge of such ring are a plurality of regions, such as four, free of the buoy plastic material and providing access to such ring, whereby rope may be affixed to the ring buoy, this usually being required by rules and regulations governing the construction of such buoys and the use thereof on boats and marine facilities. By proper proportioning of the weight of the metal ring with respect to the weight of the plastic of the buoy, the entire construction may be endowed with highly desirable ballistic properties so that such a ring buoy may be handled and particularly thrown to spin or cause the buoy to spin during the flight thereof, such characteristics improving the ballistic properties of the entire buoy to permit the buoy to travel without being easily deflected by wind and imparting stability to the buoy while using light weight plastic for buoyancy. The entire buoy can have a smooth, unbroken surface, except for the recesses in the outer edge of the material. In addition, by utilizing synthetic rope material, recourse may be had to thermoplastic welding of the rope about exposed portions of the ring, thus facilitating the manufacture of the buoy without interfering with its safety and utility.
REFERENCES:
patent: 3050754 (1962-08-01), Le Blanc
patent: 3082483 (1963-03-01), Bickford
patent: 3145400 (1964-08-01), Yoakum
patent: 3200437 (1965-08-01), Sasanko
patent: 3244346 (1966-04-01), Tijunelis
patent: 3520008 (1970-07-01), Frieder et al.
patent: 3594836 (1971-07-01), Robertson
patent: 3616475 (1971-11-01), Lewis
Blix Trygve M.
Frankfort Charles E.
Kahn Robert L.
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