Helmet making process

Details Helmet making process Helmet making process

1996-03-07

1997-03-11

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264 69, 264156, 264161, 264257, 264338, 425812, B29C 4406, B29C 4412

Patent

active

056098022

ABSTRACT:
A helmet making process includes the steps of opening the upper die with flash gates; heating the upper and lower dies in a oven with the use of an endless conveying device; inserting shape-molded plastic upper and lower shells respectively into the lower and upper and lower dies; filling a polyurethane mixture into the upper shell; shaking the upper and lower dies; heating the upper and lower dies to allow the polyurethane mixture to be foamed completely; piercing the foamed polyurethane through the air holes in the upper die; removing the semi-finished helmet; cooling the semi-finished helmet in air; cutting off the flashes and projected portions and recessed portions of the upper and lower shells; trimming and surface-treating the semi-finished helmet to form a finished helmet.

REFERENCES:
patent: 2908943 (1959-10-01), Miller
patent: 3935044 (1976-01-01), Daly
patent: 4288268 (1981-09-01), Hartung
patent: 5298208 (1994-03-01), Sibley et al.
patent: 5324460 (1994-06-01), Briggs
patent: 5376318 (1994-12-01), Ho

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