Manufacture of pipe thread protectors

Details Manufacture of pipe thread protectors Manufacture of pipe thread protectors

1981-07-20

1983-08-16

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

138 96T, B29D 100

Patent

active

043990924

ABSTRACT:
A cup shaped or cylindrical thread protector, having circumferentially spaced, internally projecting lugs, is formed by injection molding of a thermoplastic resin into a female mold cavity having a smooth cylindrical interior and having a male mold member fitting therein and cooperable therewith to define a cup shaped or cylindrical cavity. The male mold member has a plurality of recesses of a size and shape operable to produce said lugs in the molded thread protector produced therein. When the thread protector is molded, the male mold member is rotated about its axis sufficiently to compress said lugs into the cup wall thereof at a time after the thermoplastic has solidified but before it has cooled and is then pulled from within the cup shaped member.

REFERENCES:
patent: 3006030 (1961-10-01), Paull
patent: 3013308 (1961-12-01), Armour
patent: 3150222 (1964-09-01), Blaustein et al.
patent: 3247548 (1966-04-01), Fields et al.
patent: 3325576 (1967-06-01), Kessler
patent: 3344942 (1967-10-01), Hedgewick
patent: 3584092 (1971-06-01), Alexandris

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