Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1975-02-13
1978-03-14
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
417212, 264 452, 264 32, 264 467, 264298, 264314, B23P 1700, E04H 319
Patent
active
040782930
ABSTRACT:
A plastic foam rigid swimming pool cover is fabricated by forming an amorphous plastic foam material into a shape conforming generally to the periphery of the pool and into a shape for covering the swimming pool. The cover is also shaped for lifting as an integral unit from a covering position to an uncovered position above the pool via the intermediary of a plurality of lifts such as electric or hydraulic jacks coupled to the pool cover at a plurality of points spaced around the periphery thereof. The amorphous plastic foam material is formed to the desired shape by either casting or spraying the material into or onto a form of proper shape. In some embodiments, the reinforcing members are embedded in the foam to provide added strength and rigidity. The foam cover may include soil and plant receptacles for landscaping. The cover may be formed in situ or at a remote location to a template and segmented for transport to the pool and reassembled in situ. In one embodiment, a solar heater is incorporated in the upper surface of the foam cover and pool water is circulated through the solar heater for heating thereof.
REFERENCES:
patent: 2701881 (1955-02-01), McGee
patent: 2928360 (1960-03-01), Heine, Jr.
patent: 2948047 (1960-08-01), Peeler et al.
patent: 3241157 (1966-03-01), Baker et al.
patent: 3533110 (1970-10-01), Gisondi
patent: 3555573 (1971-01-01), Turner
patent: 3566420 (1971-03-01), Peterson et al.
patent: 3683428 (1972-08-01), Morris
patent: 3872522 (1975-03-01), Bennett et al.
"Rigid Urethane Foam", pub. Mobay Chemical Company, 1963, pp. 1-18.
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