Method for making a plastic spring

Details Method for making a plastic spring Method for making a plastic spring

1982-09-28

1988-03-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

249 59, 26432811, B29C 4538

Patent

active

047284749

ABSTRACT:
Method and apparatus are disclosed for making multi-turned plastic springs. At least 2 mold sections forming a central opening and a cavity with many turns are placed around a hollow sleeve having sufficient opening to flow molten plastic to individual turns. After the plastic solidifies the sleeve is moved with respect to the mold sections to shear a spring that has formed in the cavity from a plastic core in the sleeve. The mold sections are then opened and the spring is removed.

REFERENCES:
patent: 568511 (1896-09-01), Brooke
patent: 2323286 (1943-06-01), Ward
patent: 2520263 (1950-08-01), Vinal
patent: 2587070 (1952-02-01), Spillman
patent: 3081992 (1963-03-01), Kessler
patent: 4101618 (1978-07-01), Aoki
patent: 4422986 (1983-12-01), Cole
Plastics Mold Engineering Handbook, J. H. Dubois and W. I. Pribble, Van Nostrand Reinhold Co., 1978, pp. 295, 399-410, 425.

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