Reinforced plastic swing seat and method of molding

Details Reinforced plastic swing seat and method of molding Reinforced plastic swing seat and method of molding

1986-05-14

1988-12-27

Hafer, Robert A.

Undertaking

297273, 297DIG2, A63G 900

Patent

active

047936070

ABSTRACT:
A molded plastic swing seat has a pair of fully encapsulated thin flexible steel straps. To maintain the straps from warping or buckling under the forces exerted by inflow into the shallow mold of plastic material under high pressure, the straps are retained flat in a plane by the tips of closely spaced pairs of pins. Molding pressure forces a film of plastic material in the clearance beneath each tip, leaving the straps protected against corrosion. Since the embedded straps spread the force applied by ejection pins, the molded part may be ejected from the mold without waiting for it to harden, thus increasing production capacity.

REFERENCES:
patent: 1975405 (1934-10-01), Pryale
patent: 2225737 (1940-10-01), De Vaney
patent: 2444618 (1948-07-01), Seamster
patent: 2558389 (1951-07-01), Robinson
patent: 3261607 (1966-07-01), Horowitz et al.
patent: 3897056 (1975-07-01), Hock et al.
patent: 4066258 (1978-01-01), Yates
patent: 4296923 (1981-10-01), Ahrens
patent: 4524966 (1985-06-01), Shannon et al.
patent: 4575073 (1986-03-01), Thacker

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