Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1990-05-15
1992-03-10
Dawson, Robert A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 51, 264243, 264278, B29C 6722
Patent
active
050947893
ABSTRACT:
Fiberglass strips are arranged in a desired pattern. Parts of the strips are outside of a cavity and parts are inside surrounded by a quantity of polystyrene beads. The temperature of the beads is raised. This causes the beads to expand against the cavity and form the handle and also to expand against the inside parts of the strips and exert pressure on same. The latter pressure locks the strips in the handle. The temperature of the handle is then lowered and the handle is removed from the cavity. The eraser is in ready condition for shipment without further working. The parts of the strips outside of the cavity are used for removing chalk and/or ink from a board.
REFERENCES:
patent: 3023175 (1962-02-01), Rodman, Jr.
patent: 3595464 (1971-07-01), Harrison
patent: 4007509 (1977-02-01), Odhner
patent: 4020133 (1977-04-01), Altares, Jr.
patent: 4032609 (1977-06-01), Smith
patent: 4035216 (1977-07-01), Immel
patent: 4076782 (1978-02-01), Yazawa et al.
patent: 4173608 (1979-11-01), Soulier
patent: 4892698 (1990-01-01), Weihrauch
Dawson Robert A.
Kuhns Allan R.
Olsson Frederick J.
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